%0 journal article %@ 1005-0302 %A Yue, X.,Chen, D.,Krishnan, A.,Lazar, I.,Niu, Y.,Golias, E.,Wiemann, C.,Gloskovskii, A.,Schluetere, C.,Jeromin, A.,Keller, T.F.,Tong, H.,Ejnermark, S.,Pan, J. %D 2025 %J Journal of Materials Science & Technology %N %P 191-203 %R doi:10.1016/j.jmst.2024.04.006 %T Unveiling nano-scale chemical inhomogeneity in surface oxide films formed on V- and N-containing martensite stainless steel by synchrotron X-ray photoelectron emission spectroscopy/microscopy and microscopic X-ray absorption spectroscopy %U https://doi.org/10.1016/j.jmst.2024.04.006 %X Nano-scale chemical inhomogeneity in surface oxide films formed on a V- and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron- based hard X-ray Photoelectron emission spectroscopy (HAXPES) and microscopy (HAXPEEM) as well as microscopic X-ray absorption spectroscopy (μ-XAS) techniques. The results reveal the inhomogeneity in the oxide films on the micron-sized Cr2N- and VN-type particles, while the inhomogeneity on the martensite matrix phase exists due to localised formation of nano-sized tempering nitride particles at 600 °C. The oxide film formed on Cr2N-type particles is rich in Cr2O3 compared with that on the martensite matrix and VN-type particles. With the increase of tempering temperature, Cr2O3 formation is faster for the oxidation of Cr in the martensite matrix than the oxidation of Cr nitride-rich particles. %0 journal article %@ 0003-0007 %A Katragkou, E.,Sobolowski, S.P.,Teichmann, C.,Solmon, F.,Pavlidis, V.,Rechid, D.,Hoffmann, P.,Fernandez, J.,Nikulin, G.,Jacob, D. %D 2024 %J Bulletin of the American Meteorological Society %N 6 %P E962–E974 %R doi:10.1175/BAMS-D-23-0131.1 %T Delivering an Improved Framework for the New Generation of CMIP6-Driven EURO-CORDEX Regional Climate Simulations %U https://doi.org/10.1175/BAMS-D-23-0131.1 6 %X The Coordinated Regional Downscaling Experiment (CORDEX) is a coordinated international activity that has produced ensembles of regional climate simulations with domains that cover all land areas of the world. These ensembles are used by a wide range of practitioners that include the scientific community, policymakers, and stakeholders from the public and private sectors. They also provide the scientific basis for the Intergovernmental Panel on Climate Change-Assessment Reports. As its next phase now launches, the CMIP6-CORDEX datasets are expected to populate community repositories over the next couple of years, with updated state-of-the-art regional climate data that will further support national and regional communities and inform their climate adaptation and mitigation strategies. The protocol presented here focuses on the European domain (EURO-CORDEX). It takes the international CORDEX protocol covering all 14 global domains as its template. However, it expands on the international protocol in specific areas; incorporates historical and projected aerosol trends into the regional models in a consistent way with CMIP6 global climate models, to allow for a better comparison of global versus regional trends; produces more climate variables to better support sectorial climate impact assessments; and takes into account the recent scientific developments addressed in the CORDEX Flagship Pilot Studies, enabling a better assessment of processes and phenomena relevant to regional climate (e.g., land-use change, aerosol, convection, and urban environment). Here, we summarize the scientific analysis which led to the new simulation protocol and highlight the improvements we expect in the new generation regional climate ensemble. %0 conference poster %@ %A McCormick Zonderman, A.,Ferdinand, M.,Hildebrandt, L.M.,Pröfrock, D. %D 2024 %J SETAC Europe 34th Annual Meeting %N %P %T Detection of Particulate and Metal(loid) Emissions from Offshore Wind Farms %U %X %0 conference proceedings %@ %A Böhm, V.,Gruber, M.,Abele, E.,Steinbauer, C.,Victoria-Hernández, J.,Letzig, D.,Ben Khalifa, N.,Volk, W. %D 2024 %J Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity %N %P 456-466 %R doi:10.1007/978-3-031-41341-4_47 %T Influence of Equal-Channel Angular Pressing on the Microstructure and Texture of Mg-Zn-Y-Zr-RE Alloy Sheets %U https://doi.org/10.1007/978-3-031-41341-4_47 %X Due to their high specific strength, rolled Magnesium sheets have excellent prerequisites for lightweight construction applications. However, the hexagonal crystal structure of Mg offers only few slip systems that can be activated at low temperature, thus limiting the ductility. Additionally, the pronounced texture of rolled Mg sheets further limits its cold formability. Equal-Channel Angular Pressing (ECAP) is a suitable way to tailor the crystallographic texture, refine the grains, and thus improve the formability of the sheets. Since it is a discontinuous process, deformation can be applied in different shear planes by rotating the sheets. The influence of these so-called process routes on the resulting microstructure of the sheets is investigated in this work using a Mg-Zn-Y-Zr-RE alloy. Already after the second ECAP pass, a noticeable grain size refinement could be achieved. Furthermore, experimental studies showed that the elongation at fracture at elevated temperatures of the Mg alloy can be increased by ECAP. %0 journal article %@ 1436-3798 %A Rölfer, L.,Celliers, L.,Fernandes, M.,Rivers, N.,Snow, B.,Abson, D.J. %D 2024 %J Regional Environmental Change %N %P 6 %R doi:10.1007/s10113-023-02163-7 %T Assessing collaboration, knowledge exchange, and stakeholder agency in coastal governance to enhance climate resilience %U https://doi.org/10.1007/s10113-023-02163-7 %X Coastal governance plays a central role in building the capacities for adaptation and transformation towards climate resilience in coastal social-ecological systems (SES). However, enhancing climate resilience requires effective coordination between organisations involved in coastal governance. Therefore, more information about the role and agency of organisations and the relationships between them is needed. This paper aims to improve the understanding of collaboration, knowledge exchange, and stakeholder agency for enhancing climate resilience in coastal SES, using a case study in Algoa Bay, South Africa. We apply and combine stakeholder analysis and social network analysis, which is currently underrepresented in climate change adaptation research. Results suggest that different top-down and bottom-up processes are needed to improve knowledge exchange and enhance climate resilience in the coastal governance of the Algoa Bay SES. These include improved leadership, effective knowledge transfer, integration of climate information, support for bridging organisations, and inclusivity of marginalised stakeholders. These suggestions may also be more broadly applicable and transferable to similar coastal SES. Ultimately, the results of this study shed light on network structures in coastal governance facing climate change and advance research on combining stakeholder analysis and social network analysis in climate change adaptation and environmental governance research. %0 journal article %@ 0930-7575 %A Nana, H.N.,Tanessong, R.S.,Djiotang Tchotchou, L.A.,Tamofo, A.T.,Foupouapegnigni, M.,Vondou, D.A. %D 2024 %J Climate Dynamics %N %P 1-16 %R doi:10.1007/s00382-023-06892-7 %T Infuence of strong South Atlantic Ocean Dipole on the Central African rainfall’s system %U https://doi.org/10.1007/s00382-023-06892-7 %X This study examines the interlinkages between the South Atlantic Ocean Dipole (SAOD) and Central Africa (CA) rainfall variability from June to August, spanning from 1981 to 2018, using observational and reanalysis datasets. The results show that during positive SAOD events termed pSAOD, positive (negative) rainfall anomalies feature the southwestern CA termed zone I (the rest of CA landmass, termed zone II) more pronounced in reanalysis data. The reverse rainfall anomalies’ pattern characterises negative SAOD events termed nSAOD. The relationship between CA rainfall variability and SAOD strengthens when the signal of El Niño-Southern Oscillation (ENSO) is removed. However, the impact of ENSO on the SAOD is contrasted between the northern and southern CA, so that ENSO compensates for the reduced rainfall associated with the SAOD north of 10°N. South of 10°N, ENSO attenuates wetness over the southwestern zone, and reinforces the dryness over the southeastern zone. During the pSAOD events, increased precipitation is associated with increased moisture convergence over zone I, with advection originating from neighbouring oceanic regions. At the same time, convergent moisture towards zone II is weak and recirculates towards southern Africa and does not contribute to moistening the region. However, during nSAOD, zone I instead experiences strong moisture divergence, whereas zone II is a sink of moisture convergence originating from zone I and from Sahelian and west African regions. In general, the atmospheric circulation seems better developed throughout the tropospheric column during nSAOD events than during pSAOD events and would suggest strong modulating impacts of regional-and local-scale processes in the rainfall variability. %0 journal article %@ 2238-7854 %A Pasetti-Rosa, A.,Victoria-Hernandez, J.,da Cunha, P.H.C.P.,de Lima Lessa, C.R.,Bergmann, L.A.,Kurtz, G.,Letzig, D.,Klusemann, B. %D 2024 %J Journal of Materials Research and Technology : JMRT %N %P 4895-4901 %R doi:10.1016/j.jmrt.2024.02.188 %T Behavior of microstructure and mechanical properties in the stir zone of friction stir welded ME21 magnesium alloy %U https://doi.org/10.1016/j.jmrt.2024.02.188 %X In this work, Friction Stir Welding (FSW) of magnesium alloy ME21 in a T-profile is performed with a relatively higher welding speed than usual in this material. The FSW process parameters, i.e., rotational speed and welding speed, are investigated focused within its inherent microstructural and mechanical properties on the stir zones of the welded joints. The concept of a Stribeck Curve in tribological systems, is transferred to FSW to explain the transition between insufficient and full plasticization of the material. The stir zone presented a strong grain refinement due to the activation of dynamic recrystallization along with a completely changed crystallographic texture and orientation due to FSW. The hardness is overall improved, while the ductility and tensile strength were reduced. The microstructure and texture in the stir zone were not strongly influenced by changes in the welding parameters. %0 journal article %@ 1751-6161 %A Kujur, M.S.,Krishnan, A.V.,Manakari, V.,Parande, G.,Dieringa, H.,Mallick, A.,Gupta, M. %D 2024 %J Journal of the Mechanical Behavior of Biomedical Materials %N %P 106424 %R doi:10.1016/j.jmbbm.2024.106424 %T Scope of magnesium ceria nanocomposites for mandibular reconstruction: Degradation and biomechanical evaluation using a 3-dimensional finite element analysis approach %U https://doi.org/10.1016/j.jmbbm.2024.106424 %X Magnesium/Ceria nanocomposites (Mg/xCeO2 NCs (x = 0.5 %, 1 % and 1.5 %)) prepared by using powder metallurgy and microwave sintering method are assessed for their corrosion rate for a period of 28 days. As per the immersion tests results, the addition of ceria nanoparticles to pure Mg, brought about a noteworthy improvement to corrosion resistance. A corrosion rate of approximately 0.84 mm/year for Mg/0.5CeO2 and 0.99 mm/year for Mg/1.0CeO2 nanocomposites were observed. Another aspect of the study involves employing the simulation method i.e. finite element analysis (FEA) to compare the stress distribution in magnesium-ceria nanocomposite based screws and circular bars especially for Mg/0.5CeO2 and Mg/1.0CeO2. Further, the simulation also gives a perception of the impact of masticatory forces, the biting force and shear stress exerted on the Mg/0.5CeO2 and Mg/1.0CeO2 based screws. The simulations results show that the screws showed an acceptable level of stresses for a biting force up to 300 N. The circular bar as well kept its stresses at acceptable levels for the same load of 300N. The shear stress results indicated that a biting force up to 602 N can be safely absorbed by Mg/0.5CeO2 screw. The comprehensive approach allows for a better understanding of the corrosion behavior, stress distribution, and mechanical properties of the Mg/CeO2 nanocomposites, enabling the development of effective temporary implants for craniofacial trauma fixation that can withstand normal physiological forces during mastication. The study reported in this paper aims to target Mg/xCeO2 NCs for temporary implants for craniofacial trauma fixation. %0 journal article %@ 2366-7451 %A Borgers, R.,Dirksen, M.,Wijnant, I.L.,Stepek, A.,Stoffelen, A.,Akhtar, N.,Neirynck, J.,Van de Walle, J.,Meyers, J.,P.M. van Lipzig, N.P.M. %D 2024 %J Wind Energy Science %N 3 %P 697-719 %R doi:https:/dx./doi.org/10.5194/wes-9-697-2024 %T Mesoscale modelling of North Sea wind resources with COSMO-CLM: model evaluation and impact assessment of future wind farm characteristics on cluster-scale wake losses %U https://doi.org/https:/dx./doi.org/10.5194/wes-9-697-2024 3 %X As many coastal regions experience a rapid increase in offshore wind farm installations, inter-farm distances become smaller, with a tendency to install larger turbines at high capacity densities. It is, however, not clear how the wake losses in wind farm clusters depend on the characteristics and spacing of the individual wind farms. Here, we quantify this based on multiple COSMO-CLM simulations, each of which assumes a different, spatially invariant combination of the turbine type and capacity density in a projected, future wind farm layout in the North Sea. An evaluation of the modelled wind climate with mast and lidar data for the period 2008–2020 indicates that the frequency distributions of wind speed and wind direction at turbine hub height are skillfully modelled and the seasonal and inter-annual variations in wind speed are represented well. The wind farm simulations indicate that for a typical capacity density and for SW winds, inter-farm wakes can reduce the capacity factor at the inflow edge of wind farms from 59 % to between 54 % and 30 % depending on the proximity, size and number of the upwind farms. The efficiency losses due to intra- and inter-farm wakes become larger with increasing capacity density as the layout-integrated, annual capacity factor varies between 51.8 % and 38.2 % over the considered range of 3.5 to 10 MW km−2. Also, the simulated efficiency of the wind farm layout is greatly impacted by switching from 5 MW turbines to next-generation, 15 MW turbines, as the annual energy production increases by over 27 % at the same capacity density. In conclusion, our results show that the wake losses in future wind farm clusters are highly sensitive to the inter-farm distances and the capacity densities of the individual wind farms and that the evolution of turbine technology plays a crucial role in offsetting these wake losses. %0 journal article %@ 0734-2101 %A Millán-Ramos, B.,Victoria-Hernández, J.,Letzig, D.,Rodil, S.E. %D 2024 %J Journal of Vacuum Science and Technology A %N 2 %P 023102 %R doi:10.1116/6.0003242 %T Exploring the Relationship Between Sputter-Deposition Conditions and Electrochemical Response of ZrO2 Films on Biodegradable MgZnCa Alloy %U https://doi.org/10.1116/6.0003242 2 %X In this work, we investigated the enhancement of corrosion resistance in a biodegradable Mg-0.7Zn-0.6Ca (wt. %) alloy (MgZnCa) by applying ZrO2 thin films deposited via reactive magnetron sputtering. We employed a fractional factorial experimental design to systematically examine the influence of the deposition power, deposition time, and O2 fraction on the effectiveness of the ZrO2 thin film in preventing corrosion of the Mg alloy. Our analysis revealed that the ZrO2 thin films exhibited a monoclinic crystal phase and maintained stoichiometry across various O2 fractions. Interestingly, we observed a 78% roughness reduction when using the lowest O2 fraction, while roughness increased with the deposition power and time. The corrosion response of bare and ZrO2-coated MgZnCa alloy was assessed by electrochemical techniques and detection of H2 production during the Mg corrosion via gas chromatography. The optimal set of deposition conditions, essential for enhancing the short-term corrosion resistance of magnetron-sputtered ZrO2 coatings, involves maximizing thickness through high power (400 W) and extended deposition time (90 min). It is crucial to balance these factors while maintaining an appropriate O2 fraction (20%) to ensure the formation of a stoichiometric film. Avoiding excess oxygen is imperative, as it can lead to undesirable intergranular porosity and surface roughness. This optimization resulted in a 46% reduction in the evolution of H2 gas compared to the bare MgZnCa alloy. Overall, this work sheds light on the potential of ZrO2 thin films as effective corrosion-resistant coatings for MgZnCa alloys, emphasizing the critical role of deposition parameters in achieving superior protection against corrosion. %0 journal article %@ 2045-2322 %A Antunes Duda, E.,Kallien, Z.,da Silva Soares, S.,Hernandez Schneider, T.,Piaggio Cardoso, H.R.,Braga Lemos, G.V.,Falcade, T.,Reguly, A.,Klusemann, B. %D 2024 %J Scientific Reports %N %P 9882 %R doi:10.1038/s41598-024-60431-w %T Corrosion behavior of multi-layer friction surfaced structure from dissimilar aluminum alloys %U https://doi.org/10.1038/s41598-024-60431-w %X Friction surfacing (FS) is a solid-state coating technology for metallic materials, where the deposition of a consumable material on a substrate is enabled via friction and plastic deformation. The deposited layer material commonly presents a significantly refined microstructure, where corrosion could be an issue due to this grain refinement within the layer deposited, possibly creating micro galvanic pairs. The present work investigates the corrosion behavior of the FS deposited material as well as stud base material and substrate using cyclic polarization tests and open circuit potential (OCP) monitoring. Comparing the FS deposited material and the respective consumable stud base material (both AA5083), the grain size is correlated with the results from the corrosion tests, where the deposited material shows more equiaxed and refined grains in comparison to the stud base material. The cyclic potentiostatic polarization tests showed that the stud base material is more resistant to pitting nucleation presenting smaller pits and a lower amount of pits compared to deposited material and substrate. As a complement to OCP test, the stud base material is also more stable on a chloride solution compared to the substrate and the deposited material. %0 journal article %@ 0899-8418 %A Kenfack, K.,Tamoffo, A.T.,Djiotang Tchotchou, L.A.,Marra, F.,Kaissassou, S.,Nana, H.N.,Vondou, D.A. %D 2024 %J International Journal of Climatology %N 5 %P 1778-1799 %R doi:10.1002/joc.8410 %T Processes behind the decrease in Congo Basin precipitation during the rainy seasons inferred from ERA-5 reanalysis %U https://doi.org/10.1002/joc.8410 5 %X The ongoing Congo Basin drying is linked to decreasing atmospheric water vapour. To comprehend the processes reducing precipitation, we analysed water and Moist Static Energy components, associated with heating sources using ERA5 reanalysis data over the period 1981–2022. The findings reveal that the precipitation deficit in the Congo Basin during March–April–May and September–October–November is primarily attributed to a decreasing trend in the vertical moisture advection anomaly induced by vertical velocity anomalies. Following this, a horizontal moisture advection anomaly induced by specific humidity anomalies plays a significant role. However, evaporation, horizontal moisture advection anomalies induced by wind anomalies, and vertical moisture advection anomalies induced by specific humidity anomalies do not appear to contribute significantly to the drying trend in the region. The horizontal propagation of MSE advection anomalies exhibits a similar pattern to that of moisture flux advection anomalies, both at different boundaries and within the basin itself. Conversely, the contribution of vertical advection of MSE anomalies remains weak. By integrating moisture and MSE budgets, we interpret the declining precipitation trend as a consequence of uplift driven by horizontal MSE advection. Furthermore, our analysis indicates a decreasing trend in the atmospheric heating source within the basin in association with reduced precipitation. This reduction could signify a decrease in moisture influx into the basin, thereby providing more explanations for the observed drying. %0 journal article %@ 0899-8418 %A Nana, H.N.,Tamoffo, A.T.,Kaissassou, S.,Djiotang Tchotchou, L.A.,Tanessong, R.S.,Kamsu-Tamo, P.H.,Kenfack, K.,Vondou, D.A. %D 2024 %J International Journal of Climatology %N 7 %P 2462-2483 %R doi:10.1002/joc.8463 %T Performance-based evaluation of NMME and C3S models in forecasting the June–August Central African rainfall under the influence of the South Atlantic Ocean Dipole %U https://doi.org/10.1002/joc.8463 7 %X In this study, hindcasts from eight Copernicus Climate Change Service (C3S) and three North American Multi-Model Ensemble (NMME) operational seasonal forecast systems, based on dynamical climate models, are employed to investigate the influence of the South Atlantic Ocean Dipole (SAOD) on the predictive skill of Central Africa (CA) rainfall. The focus is primarily on the June–July–August season for 1993–2016. The findings reveal that, when regionally averaged, all models exhibit positive skill in predicting CA rainfall, except for the Geophysical Fluid Dynamics Laboratory (GFDL-SPEAR) model. Notably, there are significant spatial variations in skill across different regions. Model performance is particularly low (high) in the Central African Republic and Congo Basin (Gabon and Chad) and tends to deteriorate with increasing lead-time. Models that demonstrate a strong connection between SAOD and CA rainfall tend to exhibit better predictive skills in forecasting rainfall, in contrast to models with weaker connections. This leads to a significant in-phase relationship between the predictive skills of rainfall and the strength of the SAOD–rainfall connection among the models. Furthermore, the atmospheric circulation responding to SST forcing associated with the El Niño–Southern Oscillation exerts a significant influence on the robust atmospheric circulation associated with the climatological mean of SST over the SAO. This suggests that mean state bias in the SAO/equatorial Pacific region plays a role in modulating the strength of the simulated SAOD–CA rainfall connection and, consequently, the prediction skill of CA rainfall. In general, both NMME and C3S models appear to be valuable tools capable of providing essential seasonal information several months in advance. These insights can aid decision-makers in the region in making informed decisions regarding adaptation and mitigation measures. %0 journal article %@ 2073-4441 %A Fernando, R.,Ratnasooriya, H.,Bamunawala, J.,Sirisena, J.,Odara, M.G.N.,Gunawardhana, L.,Rajapaksha, L. %D 2024 %J Water %N 10 %P 1317 %R doi:10.3390/w16101317 %T Assessing Climate-Change-Driven Impacts on Water Scarcity: A Case Study of Low-Flow Dynamics in the Lower Kalu River Basin, Sri Lanka %U https://doi.org/10.3390/w16101317 10 %X The adverse impacts of climate change are becoming more frequent and severe worldwide, and Sri Lanka has been identified as one of the most severely affected countries. Hence, it is vital to understand the plausible climate-change-driven impacts on water resources to ensure water security and socio-economic well-being. This study presents novel assessments on low-flow dynamics along the lower Kalu River Basin, Sri Lanka, and water availability during the dry spells of the 2030–2060 period. Bias-corrected daily precipitation projections of a high resolution (25 km × 25 km) NCC-NORESM1-M regional climate model is used here to force a calibrated HEC-HMS hydrological model to project catchment discharge during the future period considered under the two end-member Representative Concentration Pathways (i.e., RCP 2.6 and RCP 8.5). Our results show that the study area (i.e., Kuda Ganga sub-basin) may become warmer (in non-monsoonal periods) and wetter (in monsoon season) under both scenarios during the near future (2030–2040) when compared to the baseline period (1976–2005) considered. Consequently, the streamflow may reduce, making it the decade with the largest water deficit within the time horizon. The subsequent deficit volume assessment for the 2031–2040 period shows a probable water shortage (~5 million m3) under the RCP 2.6 scenario, which may last for ~47 days with an average daily intensity of 105,000 m3. Our results highlight the need of incorporating climate-change-driven impacts in water resources management plans to ensure water security. %0 journal article %@ 2666-0164 %A De Zoysa, S.,Sirisena, J.,Perera, H.,Fernando, S.,Gunathilaka, M.,Rathnayake, U. %D 2024 %J Case Studies in Chemical and Environmental Engineering %N %P 100713 %R doi:10.1016/j.cscee.2024.100713 %T Development of intensity-duration-frequency curves for Sri Lanka using satellite-based precipitation products – Understanding environmental conditions and concerns %U https://doi.org/10.1016/j.cscee.2024.100713 %X Rainfall Intensity Duration Frequency (IDF) curves can be identified as a major role in the planning of urban drainage infrastructure. Sri Lanka, which is an island surrounded by the Indian Ocean, is frequently exposed to various climatic alterations. Sri Lanka has specific region-wise IDF relationships for the entire country, however, these IDF curves were developed more than 30 years ago. Many in-situ rainfall observations in Sri Lanka have insufficient record lengths and the absence of finer time scale records (e.g. 15 min, hourly) leading to unreliable IDF curve developments. Given this importance, the present paper demonstrates the application of Satellite-based Precipitation Product (SbPP) daily rainfall in developing IDF curves for Sri Lanka. Rainfall satellite estimates derived from Integrated Multi-satellite Retrievals for GPM (IMERG), Tropical Rainfall Measuring Mission (TRMM-3B42), and Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks – Climate Data Record (PERSIANN-CDR) have been used to evaluate the ability of application of remote sensing data to develop IDF curves for Sri Lanka against rain gauge (RG) data. Our study breaks new ground by generating 50 IDF curves tailored to specific locations covering the whole county Sri Lanka, using daily rainfall data from RGs and three SbPPs during the period between 1990 and 2019. This marks a significant departure from the conventional approach, offering a more granular understanding of rainfall patterns in the country. By providing IDF curves for individual locations, our research presents a novel contribution to Sri Lanka's IDF history. At first, to evaluate the accuracy of SbPPs, statistical analysis was conducted using continuous and categorical evaluation indices. Second, IDF curves were developed and compared with the presently available IDF curves. Results showcased that IMERG outperformed all SbPPs, while PERSIANN-CDR showed dire performances. The IMERG and TRMM-3B42 products tend to overestimate light precipitation regions in high elevations and overestimate heavy rainfall in low elevations compared to rain gauge data. Rainfall intensities derived by rain gauge data depicted relative changes within ±30% for shorter durations and ±20% for longer durations while SbPPs showed beyond ±30% difference concerning the previously developed IDFs. It was apparent that these products have significant inaccuracies which cannot be neglected when utilizing them in developing IDF curves. This study will be beneficial in solving design problems associated with urban runoff control and disposal where knowing the rainfall intensities of different return periods with different durations is vital. %0 journal article %@ 2238-7854 %A Calderón-Hernández, J.W.,Moura da Fonseca, D.P.,Prada-Ramirez, O.M.,Hincapie-Ladino, D.,de Melo, H.G.,Padilha, A.F. %D 2024 %J Journal of Materials Research and Technology : JMRT %N %P 3112-3121 %R doi:10.1016/j.jmrt.2024.04.024 %T Effect of Mo content on microstructure and corrosion behavior in HCl of ultra-high strength maraging steels %U https://doi.org/10.1016/j.jmrt.2024.04.024 %X Maraging steels are one of the highest strength steels commercially available. The new versions are known as ultra-high strength maraging (UHSM) steels and can offer yield strength values over 3 GPa. The aim of this investigation was evaluating the electrochemical behavior of three non-commercial/laboratory UHSM steels containing 13Ni–15Co and Mo content variations (7.5, 11 and 15 wt%). The UHSM steels were annealed at 1000 °C and studied at different conditions (non-aged and aged at 480 °C for 3 h and 6 h). As reference material, a commercial maraging steel (18Ni–9Co–5Mo) heat treated according to typical recommendations (annealed at 820 °C for 1 h and aged at 480 °C for 4 h) was used. The UHSM presented considerable higher hardness than commercial maraging. Comparing between the UHSM steels, the samples treated for 6 h do not contribute to increase the hardness when compared to those of 3 h. The electrochemical tests in hydrochloric aqueous solution showed that commercial maraging steel and the UHSM containing most Mo (11 wt%) aged by 6 h presented the worst corrosion resistance while the best performance was obtained by the samples with 7.5 and 11 wt% Mo aged for 3 h. %0 conference proceedings %@ %A Victoria-Hernandez, J.,Cano-Castillo, G.,Böhm, V.,Gruber, M.,Volk, W.,Ben Khalifa, N.,Letzig, D. %D 2024 %J Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity. ICTP 2023. Lecture Notes in Mechanical Engineering %N %P 744-753 %R doi:10.1007/978-3-031-42093-1_72 %T Effect of ECAP process on the activation of deformation mechanisms during subsequent uniaxial tension of Mg-ZEWK2000 sheets %U https://doi.org/10.1007/978-3-031-42093-1_72 %X The present work investigates the influence of two different processing routes on mechanical behavior of Mg-Zn-Nd-Y-Zr (ZEWK2000) Mg sheets. Hot-rolled sheets, with dimensions of 200 × 200 × 1.8 mm3, were processed at 225 ℃ by a two equal channel angular pressing (ECAP) passes following the route DC2 with a rotation of 90° around the normal direction (ND) of the sheet. Shear deformation applied by ECAP weakens the texture and promotes a broad angular distribution of basal planes in the pressing direction. The resulting crystallographic texture promotes a change of the balance of active deformation mechanisms, i.e. slip of dislocations and twinning, during subsequent uniaxial deformation. To assess the effect of texture changes on the activation of slip systems, a systematic analysis of the slip traces after uniaxial tension of ECAP processed samples at room temperature was carried out. The analysis reveals the profuse activation of additional slip systems than the common basal  slip and pyramidal II , where non-basal slip such as prismatic  , pyramidal  and pyramidal I played a major role than expected in the rolled sheet. The relative activity of deformation mechanisms was significantly changed in the ECAP processed sheet, where extension twinning, basal , pyramidal I  and pyramidal II  slip dominated the deformation. Overall, the activation of extension twinning in the ECAP processed sheet is beneficial for the reduction of anisotropy and the improvement of formability of the processed samples. %0 journal article %@ 2397-3358 %A Shaw, W.J.,Kidder, M.K.,Bare, S.R.,Delferro, M.,Morris, J.R.,Toma, F.M.,Senanayake, S.D.,Autrey, T.,Biddinger, E.J.,Boettcher, S.,Bowden, M.E.,Britt, P.F.,Brown, R.C.,Bullock, R.M.,Chen, J.G.,Daniel, C.,Dorhout, P.K.,Efroymson, R.A.,Gaffney, K.J.,Gagliardi, L.,Harper, A.S.,Heldebrant, D.J.,Luca, O.R.,Lyubovsky, M.,Male, J.L.,Miller, D.J.,Prozorov, T.,Rallo, R.,Rana, R.,Rioux, R.M.,Sadow, A.D.,Schaidle, J. A.,Schulte, L.A.,Tarpeh, W.A.,Vlachos, D.G.,Vogt, B.D.,Weber, R.S.,Yang, J.Y.,Arenholz, E.,Helms, B.A.,Huang, W.,Jordahl, J.L.,Karakaya, C.,Kian, K.,Kothandaraman, J.,Lercher, J.,Liu, P.,Malhotra, D.,Mueller, K.T.,O’Brien, C.P.,Palomino, R.M.,Qi, L.,Rodriguez, J.A.,Rousseau, R.,Russell, J.C.,Sarazen, M.L.,Sholl, D.S.,Smith, E.A.,Stevens, M.B.,Surendranath, Y.,Tassone, C.J.,Tran, B.,Tumas, W.,Walton, K.S. %D 2024 %J Nature Reviews Chemistry %N %P 376-400 %R doi:10.1038/s41570-024-00587-1 %T A US perspective on closing the carbon cycle to defossilize difficult-to-electrify segments of our economy %U https://doi.org/10.1038/s41570-024-00587-1 %X Electrification to reduce or eliminate greenhouse gas emissions is essential to mitigate climate change. However, a substantial portion of our manufacturing and transportation infrastructure will be difficult to electrify and/or will continue to use carbon as a key component, including areas in aviation, heavy-duty and marine transportation, and the chemical industry. In this Roadmap, we explore how multidisciplinary approaches will enable us to close the carbon cycle and create a circular economy by defossilizing these difficult-to-electrify areas and those that will continue to need carbon. We discuss two approaches for this: developing carbon alternatives and improving our ability to reuse carbon, enabled by separations. Furthermore, we posit that co-design and use-driven fundamental science are essential to reach aggressive greenhouse gas reduction targets. %0 journal article %@ 0010-938X %A Yue, X.,Chen, D.,Krishnan, A.,Tidesten, M.,Larsson, A.,Tong, H.,Gloskovskii, A.,Schlueter, C.,Scardamaglia, M.,Shavorskiy, A.,Pan, J. %D 2024 %J Corrosion Science %N %P 112133 %R doi:10.1016/j.corsci.2024.112133 %T In depth analysis of the passive film on martensitic tool alloy: effect of tempering temperature %U https://doi.org/10.1016/j.corsci.2024.112133 %X Effect of tempering temperature on the composition of the passive film of a martensitic tool alloy was studied by synchrotron-based hard/soft X-ray photoelectron spectroscopy and electrochemical analyses. The contents of Cr and Mo in the passive film are affected by precipitation of tempering carbides. Increase of tempering temperature from 200 to 525°C leads to enhanced formation of Cr/Mo-rich tempering carbides and Cr depletion. Tempering at 525°C results in a Cr content < 11 at% in the underlying metallic layer and formation of a Cr-deficient defective passive film, and thus loss of passivity for the tool alloy in corrosive conditions. %0 dataset %@ %A Siems, A.,Nantke, C.,Neumann, A.,Sanders, T.,Pröfrock, D. %D 2024 %J PANGEA %N %P %R doi:10.1594/PANGAEA.967370 %T Nutrient and trace metal data distribution from water samples of ALKOR cruise AL557 %U https://doi.org/10.1594/PANGAEA.967370 %X The water samples were taken from Niskin bottles attached to a CTD in June 2021 on the cruise AL557 in the Skagerrak and the North Sea. The trace element samples were filtered in triplicates with DigiFILTERs (trademark) (0.45 microm, 50 mL, SCP Science, Canada) and measured by seaFAST-ICP-MS (seaFAST SP2, Elemental Scientific, USA; Agilent 8900, Agilent Technologies, Japan; Przibilla et al., 2023; https://doi.org/10.1002/wer.10922). The nutrient samples were filtered with 0.47microm cellulose acetate syringe filters (Minisart, Sartorius, Germany) and analyzed with standard colorimetric techniques (Hansen and Koroleff, 2007) on a continuous flow auto analyzer (AA3, SEAL Analytical, Germany). %0 conference lecture %@ %A Przibilla, A.,Iwainski, S.,Zimmermann, T.,Nantke, C.,Pröfrock, D. %D 2023 %J 54th annual conference of the DGMS %N %P %T Analysis of dissolved trace metals in North Sea water: How to obtain reliable data using ICP-MS/MS? %U %X %0 conference lecture %@ %A Przibilla, A.,Sanders, T.,Zimmermann, T.,Schulz, G.,Nantke, C.,Pröfrock, D. %D 2023 %J Goldschmidt Conference 2023 %N %P %T Response of metal contaminated Skagerrak sediments to changing oxygen conditions %U %X %0 journal article %@ 0044-7447 %A Celliers, L.,Rölfer, L.,Rivers, N.,Rosendo, S.,Fernandes, M.,Snow, B.,Mãnez Costa, M. %D 2023 %J Ambio %N %P 1418-1430 %R doi:10.1007/s13280-023-01844-1 %T Stratification of stakeholders for participation in the governance of coastal social-ecological systems %U https://doi.org/10.1007/s13280-023-01844-1 %X Knowledge co-production has become part of an evolution of participatory and transdisciplinary research approaches that are increasingly important for achieving sustainability. To effectively involve the most appropriate stakeholders there is a need for engagement and increasing prominence of stakeholders in environmental management and governance processes. The paper aims at developing and testing a methodology for stratifying stakeholders by (i) classifying organisations involved in coastal and ocean governance by their agency, and (ii) grouping them into organisational archetypes for representation and selection in research processes. Agency was measured by the three dimensions of scale, resources, and power. Each dimension was further elaborated as a set of indicators. The methodology is applied in the context of a research project set in Algoa Bay, South Africa. The stratification of organisations enabled the research team to gain a better understanding of the stakeholder landscape of organisational agency, and thus identify the most relevant stakeholder with which to engage. The use of a hierarchical cluster analysis identified five organisational archetypes in relation to ocean and coastal governance in Algoa Bay. The methodology used in this study proposes an informed and intentional approach to create the conditions under which the co-production of and participation in research processes can take place. %0 journal article %@ 0272-7714 %A Fernandes, A.M.,Passos, E.N.,Calil, P.H.R.,Moser, G.A.O.,de Oliveira, E.N.,Espindola, R.P. %D 2023 %J Estuarine, Coastal and Shelf Science %N %P 108433 %R doi:10.1016/j.ecss.2023.108433 %T Temperature stratification in the Guanabara Bay and its relationship with wind-induced coastal upwelling off Cabo Frio; Brazil %U https://doi.org/10.1016/j.ecss.2023.108433 %X This study investigates the mechanisms that control the occurrence of cold water intrusion events observed in Guanabara Bay, Rio de Janeiro, Brazil. To achieve this, we used multiple time-series data comprising in-situ temperatures recorded at depths of 5 m and 20 m in three sites in the Guanabara Bay region, wind velocities from three meteorological stations along the Brazilian coast, and sea level data from a tidal gauge located in the interior of Guanabara Bay. We found that from October 2014 to May 2016, near-bed temperatures in Guanabara Bay were dominated by subinertial variability. We identified subinertial cold water events, defined by temperature values below 18 °C, that were associated with South Atlantic Central Water intrusions. We obtained a total of 21 cold water events during the 18-month (545-day) sampling period, corresponding to 92.5 days or 17% of the time. Additionally, we found statistically significant lag-adjusted correlation coefficients (0.37-0.95) between near-bed (20 m) temperatures in Guanabara Bay and alongshore winds from the Arraial do Cabo meteorological station, which act in the well-known Cabo Frio upwelling system along the coast. These upwelling-favorable winds led near-bed temperature values in Guanabara Bay by 12 to 56 h and provided the remote forcing mechanism for the cold water intrusions in Guanabara Bay. Locally, the shelf-bay intrusion velocity values ranged from 0.04 to 0.50 ms−1, consistent with a gravity current enhanced by baroclinic pressure gradient, the local forcing mechanism. The cold water intrusions caused an increase in the vertical temperature stratification within Guanabara Bay, as verified for all analyzed events. We also identified subinertial oscillations due to Coastal Trapped Waves (CTWs) propagation from our sea level data records and evaluated their impacts on cold water events. %0 journal article %@ 1600-5767 %A McCluskey, A.,Caruana, A.,Kinane, C.,Armstrong, A.,Arnold, T.,Cooper, J.,Cortie, D.,Hughes, A.,Moulin, J.,Nelson, A.,Potrzebowski, W.,Starostin, V. %D 2023 %J Journal of Applied Crystallography %N 1 %P 12-17 %R doi:10.1107/S1600576722011426 %T Advice on describing Bayesian analysis of neutron and X-ray reflectometry %U https://doi.org/10.1107/S1600576722011426 1 %X As a result of the availability of modern software and hardware, Bayesian analysis is becoming more popular in neutron and X-ray reflectometry analysis. The understandability and replicability of these analyses may be harmed by inconsistencies in how the probability distributions central to Bayesian methods are represented in the literature. Herein advice is provided on how to report the results of Bayesian analysis as applied to neutron and X-ray reflectometry. This includes the clear reporting of initial starting conditions, the prior probabilities, the results of any analysis and the posterior probabilities that are the Bayesian equivalent of the error bar, to enable replicability and improve understanding. It is believed that this advice, grounded in the authors' experience working in the field, will enable greater analytical reproducibility in the work of the reflectometry community, and improve the quality and usability of results. %0 journal article %@ 2666-7762 %A Rocklöv, J.,Semenza, J. C.,Dasgupta, S.,Robinson, E. J. Z.,Abd El Wahed, A.,Alcayna, T.,Arnés-Sanz, C.,Bailey, M.,Bärnighausen, T.,Bartumeus, F.,Borrell, C.,Bouwer, L. M.,Bretonnière, P.-A.,Bunker, A.,Chavardes, C.,van Daalen, K. R.,Encarnação, J.,González-Reviriego, N.,Guo, J.,Johnson, K.,Koopmans, M. P. G.,Máñez Costa, M.,Michaelakis, A.,Montalvo, T.,Omazic, A.,Palmer, J. R. B.,Preet, R.,Romanello, M.,Shafiul Alam, M.,Sikkema, R. S.,Terrado, M.,Treskova, M.,Urquiza, D.,Sjodin, H.,Farooq, Z.,Sewe, M.,MacGuire, F.,Zavitsanou, E.,Milonas, P.,Papachristos, D.,Bisia, M.,Balatsos, G.,Antonatos, S.,Martinez-Urtaza, J.,Triñanes, J.,Williams, M.,Dekramanjian, B.,Broome, K.,Johnson, O.,Bouwer, L.,Costa, M. M.,Martin, A.,Kotova, L.,Wübbelmann, T.,Walsh, F.,Stiles, P.,Baron, J.,Hatfield, C.,Heidecke, J.,Singh, P.,Bosello, F.,Mehryar, S.,de Best, P.,Hartung, T.,Abourashed, A.,Bellver, J.,Cerecedo, C.,Lowe, R.,Bautista, M. L.,Moreira de Carvalho, B.,Fletcher, C.,Rosenbluth, J.,Corradini, M.,Ramon, J.,Brodie, L. P.,Llabres, A.,El Wahed, A. A.,Ceruti, A.,Truyen, U.,Rodrigues, S.,Ågren, E.,Grandi, G.,Widgren, S.,Parvage, M.,Bergström, M.,Alam, M. S.,Haque, R.,Khan, W. A.,Valsecchi, A.,Barahona, L.,Realp, E.,de Roode, S. %D 2023 %J The Lancet Regional Health - Europe %N %P 100701 %R doi:10.1016/j.lanepe.2023.100701 %T Decision-support tools to build climate resilience against emerging infectious diseases in Europe and beyond %U https://doi.org/10.1016/j.lanepe.2023.100701 %X Climate change is one of several drivers of recurrent outbreaks and geographical range expansion of infectious diseases in Europe. We propose a framework for the co-production of policy-relevant indicators and decision-support tools that track past, present, and future climate-induced disease risks across hazard, exposure, and vulnerability domains at the animal, human, and environmental interface. This entails the co-development of early warning and response systems and tools to assess the costs and benefits of climate change adaptation and mitigation measures across sectors, to increase health system resilience at regional and local levels and reveal novel policy entry points and opportunities. Our approach involves multi-level engagement, innovative methodologies, and novel data streams. We take advantage of intelligence generated locally and empirically to quantify effects in areas experiencing rapid urban transformation and heterogeneous climate-induced disease threats. Our goal is to reduce the knowledge-to-action gap by developing an integrated One Health—Climate Risk framework. %0 journal article %@ 1879-0003 %A Blanco, F.G.,Machatschek, R.,Keller, M.,Hernández-Arriaga, A.M.,Godoy, M.S.,Tarazona, N.A.,Prieto, M.A. %D 2023 %J International Journal of Biological Macromolecules %N Part 2 %P 126760 %R doi:10.1016/j.ijbiomac.2023.126760 %T Nature-inspired material binding peptides with versatile polyester affinities and binding strengths %U https://doi.org/10.1016/j.ijbiomac.2023.126760 Part 2 %X Biodegradable polyesters, such as polyhydroxyalkanoates (PHAs), are having a tremendous impact on biomedicine. However, these polymers lack functional moieties to impart functions like targeted delivery of molecules. Inspired by native GAPs, such as phasins and their polymer-binding and surfactant properties, we generated small material binding peptides (MBPs) for polyester surface functionalization using a rational approach based on amphiphilicity. Here, two peptides of 48 amino acids derived from phasins PhaF and PhaI from Pseudomonas putida, MinP and the novel-designed MinI, were assessed for their binding towards two types of PHAs, PHB and PHOH. In vivo, fluorescence studies revealed selective binding towards PHOH, whilst in vitro binding experiments using the Langmuir-Blodgett technique coupled to ellipsometry showed KD in the range of nM for all polymers and MBPs. Marked morphological changes of the polymer surface upon peptide adsorption were shown by BAM and AFM for PHOH. Moreover, both MBPs were successfully used to immobilize cargo proteins on the polymer surfaces. Altogether, this work shows that by redesigning the amphiphilicity of phasins, a high affinity but lower specificity to polyesters can be achieved in vitro. Furthermore, the MBPs demonstrated binding to PET, showing potential to bind cargo molecules also to synthetic polyesters. %0 journal article %@ 2624-9553 %A Ley, D.,Guillén Bolaños, T.,Castaneda, A.,Hidalgo, H.G.,Girot Pignot, P.O.,Fernández, R.,Alfaro, E.J.,Castellanos, E. %D 2023 %J Frontiers in Climate %N %P 1215062 %R doi:10.3389/fclim.2023.1215062 %T Central America urgently needs to reduce the growing adaptation gap to climate change %U https://doi.org/10.3389/fclim.2023.1215062 %X Central America is highly impacted by current extreme events associated with climate variability and the adverse effects of climate change, showing high vulnerability compounded by its historical context and socio-economic structure. In the light of the important findings published by the WGII of the IPCC AR6 in 2022 on the adverse effects of climate change on the Central America region, there is still a clear need to improve data availability and increase the number of studies on projections of changes in the climate, risks, impacts, vulnerability and adaptation from the region to inform decision-makers and practitioners. The region has seen an increase in the number of adaptation projects implemented; however, there is limited information about their success or failure and there are few case studies and reviews of lessons learnt, highlighting an important gap in the implementation of effective adaptation measures. This paper presents a current review of the literature on climatology, hydrology, impacts and vulnerability, mitigation and adaptation responses, action plans and potential losses and damages in the region. It also proposes actionable recommendations based on the main gaps found and presents a case study of the Central American Dry Corridor, one of the climate change and underdevelopment hotspots of the region. We finish with a discussion highlighting the importance of considering system transitions perspectives, as well as the need to plan and implement more transformational adaptation approaches to reduce further losses and damages and to further address adaptation gaps in Central America. %0 journal article %@ 0037-0746 %A Wilckens, H.,Schwenk, T.,Lüdmann, T.,Betzler, C.,Zhang, W.,Chen, J.,Hernández-Molina, F.,Lefebvre, A.,Cattaneo, A.,Spieß, V.,Miramontes, E. %D 2023 %J Sedimentology %N 5 %P 1472-1495 %R doi:10.1111/sed.13093 %T Factors controlling the morphology and internal sediment architecture of moats and their associated contourite drifts %U https://doi.org/10.1111/sed.13093 5 %X The interaction of sedimentary systems with oceanographic processes in deep-water environments is not well understood yet, despite its importance for palaeoenvironmental reconstructions, and for a full understanding of source-to-sink sediment transport. The aim of this study is to improve the understanding of how contourite moats, elongated depressions formed by bottom currents associated with contourite drifts, develop and of the link between moat-drift system morphology and bottom current dynamics. This study provides a systematic comparison of 185 cross-sections of moat-drift systems distributed at 39 different locations worldwide, and a detailed analysis of the morphology of six moats that cover a wide range of typical geological and hydrodynamic settings. Additionally, in situ measured current data were analysed to better link hydrodynamics to moat morphology. The median of all profiles across all moat-drift systems reveals a 50 m relief, a width of 2.3 km, a relief to width ratio of 0.022, a slope angle of 6°, a drift angle of 3° and a concave-up shaped morphology. Moats can be over 100 km long. Some moats are driven by sediment erosion while others are depositional and primarily exist due to differential sedimentation inside the moat compared to the drift alongside the moat. A new sub-classification of moat-drift systems based on their stratigraphy is proposed. This classification distinguishes moats depending on the degree of erosion versus deposition. No relation is found between latitude and moat-drift morphology or stratigraphy in the analysed examples. The combined data indicate that a steeper slope focuses the current more than a gentle slope, resulting in an increase of the relief-width ratio and drift angle. Thus, this study provides new insides into the interaction of ocean currents with sedimentary morphology, which thereby affects the evolution of a poorly understood deepwater sedimentary system. %0 dataset %@ %A Przibilla, A.,Sanders, T.,Neumann, A.,Nantke, C. %D 2023 %J PANGEA %N %P %R doi:10.1594/PANGAEA.956878 %T Pore water nutrient concentrations from sediments sampled during RV Alkor cruise AL557 %U https://doi.org/10.1594/PANGAEA.956878 %X The samples were taken in June 2021 on the cruise AL557 in the Skagerrak and the central and southern North Sea. The samples were taken to analyze pore water concentrations of nutrients in order to monitor the nitrogen turnover processes taking place in the sediment. Pore water samples were taken with rhizon samplers (0.15 µm pore size, CSS; Rhizosphere, Netherlands) from intact sediment cores that were taken with a Multiple Corer. The samples were directly frozen until analysis on 7th and 8th March 2022. The nutrient concentrations (ammonia, silicate, phosphate, nitrite) were measured using a TECAN infinite 200 plate reader. Colorimetric methods according to Ringuet et al. (2011) for phosphate and silicate, Yu et al. (1994) for ammonia and Garcia-Robledo et al. (2014) were applied. %0 editorial %@ 2959-8753 %A Jiao, N.,Zhu, C.,Liu, J.,Luo, T.,Bai, M.,Yu, Z.,Chen, Q.,Rinkevich, B.,Weinbauer, M.,Thomas, H.,Fernández-Méndez, M.,López-Abbate, C.,Signori, C. N.,Nagappa, R.,Koblížek, M.,Kaartokallio, H.,Hyun, J.-H.,Jiao, F.,Chen, F.,Cai, W.-J. %D 2023 %J The Innovation Geoscience %N 2 %P 100029-100030 %R doi:10.59717/j.xinn-geo.2023.100029 %T A roadmap for Ocean Negative Carbon Emission eco-engineering in sea-farming fields %U https://doi.org/10.59717/j.xinn-geo.2023.100029 2 %X %0 conference lecture %@ %A Victoria-Hernandez, J.,Cano-Castillo, G.,Böhm, V.,Gruber, M.,Volk, W.,Ben Khalifa, N.,Letzig, D. %D 2023 %J 14th International Conference on the Technology of Plasticity (ICTP) %N %P %T Effect of ECAP process on the activation of deformation mechanisms during subsequent uniaxial tension of Mg-ZEWK2000 sheets %U %X %0 conference lecture %@ %A Böhm, V.,Gruber, M.,Abele, E.,Steinbauer, C.,Victoria-Hernández, J.,Letzig, D.,Ben Khalifa, N.,Volk, W. %D 2023 %J 14th International Conference on the Technology of Plasticity (ICTP) %N %P %T Influence of Equal-Channel Angular Pressing on the Microstructure and Texture of Mg-Zn-Y-Zr-RE Alloy Sheets %U %X %0 journal article %@ 2079-4983 %A Moreno, L.,Wang, C.,Lamaka, S.V.,Zheludkevich, M.L.,Rodríguez-Hernández, J.,Arrabal, R.,Matykina, E. %D 2023 %J Journal of Functional Biomaterials %N 2 %P 65 %R doi:10.3390/jfb14020065 %T Ciprofloxacin Release and Corrosion Behaviour of a Hybrid PEO/PCL Coating on Mg3Zn0.4Ca Alloy %U https://doi.org/10.3390/jfb14020065 2 %X In the present work, a hybrid hierarchical coating (HHC) system comprising a plasma electrolytic oxidation (PEO) coating and a homogeneously porous structured polycaprolactone (PCL) top-coat layer, loaded with ciprofloxacin (CIP), was developed on Mg3Zn0.4Ca alloy. According to the findings, the HHC system avoided burst release and ensured gradual drug elution (64% over 240 h). The multi-level protection of the magnesium alloy is achieved through sealing of the PEO coating pores by the polymer layer and the inhibiting effect of CIP (up to 74%). The corrosion inhibition effect of HHC and the eluted drug is associated with the formation of insoluble CIP-Me (Mg/Ca) chelates that repair the defects in the HHC and impede the access of corrosive species as corroborated by FTIR spectra, EIS and SEM images after 24 h of immersion. Therefore, CIP participates in an active protection mechanism by interacting with cations coming through the damaged coating. %0 journal article %@ 2624-9553 %A Petzold J.,Joe E.T.,Kelman I.,Magnan A.K.,Mirbach C.,Nagle Alverio G.,Nunn P.D.,Ratter B.M.W.,The Global Adaptation Mapping Initiative Team %D 2023 %J Frontiers in Climate %N %P 1072231 %R doi:doi.org/10.3389/fclim.2022.1072231 %T Between tinkering and transformation: A contemporary appraisal of climate change adaptation research on the world's islands %U https://doi.org/doi.org/10.3389/fclim.2022.1072231 %X Islands are at the center of discourses on climate change. Yet despite extensive work on diverse island systems in a changing climate, we still lack an understanding of climate change-related responses amongst islands and what shifting from what might be called “tinkering” (perhaps heat warnings) to “transformational” adaptation (perhaps relocation) means for these vastly different landmasses which are often grouped together by default. Through a systematic review of the climate change adaptation scientific literature, this paper critically reflects on how considering islands as a homogenous ensemble and the use of buzzwords such as “transformational adaptation” may be problematic for diverse island realities under climate change. Our findings show that the adaptation evidence base actually provides literature on contrasting island types and cultural and political contexts, including Small Island Developing States as well as other island territories. This study finds research gaps with respect to regions (e.g., South America, Africa, and Mediterranean) and that there is overall both little evidence of and a lack of context-specific definitions of transformational adaptation in island contexts. The adaptation literature does not yet fully reflect the experiences or needs of islands regarding transitions and transformations throughout history. %0 journal article %@ 2296-7745 %A van Leeuwen S.M.,Lenhart H.J.,Prins T.C.,Blauw A.,Desmit X.,Fernand L.,Friedland R.,Kerimoglu O.,Lacroix G.,van der Linden A.,Lefebvre A.,van der Molen J.,Plus M.,Ruvalcaba Baroni I.,Silva T.,Stegert C.,Troost T.A.,Vilmin L. %D 2023 %J Frontiers in Marine Science %N %P 1129951 %R doi:doi.org/10.3389/fmars.2023.1129951 %T Deriving pre-eutrophic conditions from an ensemble model approach for the North-West European seas %U https://doi.org/doi.org/10.3389/fmars.2023.1129951 %X The pre-eutrophic state of marine waters is generally not well known, complicating target setting for management measures to combat eutrophication. We present results from an OSPAR ICG-EMO model assessment to simulate the pre-eutrophic state of North-East Atlantic marine waters. Using an ecosystem model ensemble combined with an observation-based weighting method we derive sophisticated estimates for key eutrophication indicators. Eight modelling centres applied the same riverine nutrient loads, atmospheric nutrient deposition rates and boundary conditions to their specific model set-up to ensure comparability. The pre-eutrophic state was defined as a historic scenario of estimated nutrient inputs (riverine, atmospheric) at around the year 1900, before the invention and widespread use of industrial fertilizers. The period 2009-2014 was used by all participants to simulate both the current state of eutrophication and the pre-eutrophic scenario, to ensure that differences are solely due to the changes in nutrient inputs between the scenarios. Mean values were reported for winter dissolved inorganic nutrients and total nutrients (nitrogen, phosphorus) and the nitrogen to phosphorus ratio, and for growing season chlorophyll, chlorophyll 90th percentile, near-bed oxygen minimum and net phytoplankton production on the level of the OSPAR assessment areas. Results showed distinctly lower nutrient concentrations and nitrogen to phosphorus ratio’s in coastal areas under pre-eutrophic conditions compared to current conditions (except in the Meuse Plume and Seine Plume areas). Chlorophyll concentrations were estimated to be as much as ~40% lower in some areas, as were dissolved inorganic phosphorus levels. Dissolved inorganic nitrogen levels were found to be up to 60% lower in certain assessment areas. The weighted average approach reduced model disparities, and delivered pre-eutrophic concentrations in each assessment area. Our results open the possibility to establish reference values for indicators of eutrophication across marine regions. The use of the new assessment areas ensures local ecosystem functioning is better represented while political boundaries are largely ignored. As such, the reference values are less associated to member states boundaries than to ecosystem boundaries. %0 journal article %@ 2752-0706 %A Ciliberti, S.A.,Alvarez Fanjul, E.,Pearlman, J.,Wilmer-Becker, K.,Bahurel, P.,Ardhuin, F.,Arnaud, A.,Bell, M.,Berthou, S.,Bertino, L.,Capet, A.,Chassignet, E.,Ciavatta, S.,Cirano, M.,Clementi, E.,Cossarini, G.,Coro, G.,Corney, S.,Davidson, F.,Drevillon, M.,Drillet, Y.,Dussurget, R.,El Serafy, G.,Fennel, K.,Garcia Sotillo, M.,Heimbach, P.,Hernandez, F.,Hogan, P.,Hoteit, I.,Joseph, S.,Josey, S.,Le Traon, P.Y.,Libralato, S.,Mancini, M.,Matte, P.,Melet, A.,Miyazawa, Y.,Moore, A.M.,Novellino, A.,Porter, A.,Regan, H.,Romero, L.,Schiller, A.,Siddorn, J.,Staneva, J.,Thomas-Courcoux, C.,Tonani, M.,Garcia-Valdecasas, J.M.,Veitch, J.,von Schuckmann, K.,Wan, L.,Wilkin, J.,Zufic, R. %D 2023 %J State of the Planet %N %P %R doi:10.5194/sp-1-osr7-2-2023 %T Evaluation of operational ocean forecasting systems from the perspective of the users and the experts %U https://doi.org/10.5194/sp-1-osr7-2-2023 %X %0 journal article %@ 2296-7745 %A El Serafy, G.,Mészáros, L.,Fernández, V.,Capet, A.,She, J.,Sotillo, M.G.,Melet, A.,Legrand, S.,Mourre, B.,Campuzano, F.,Federico, I.,Guarnieri, A.,Rubio, A.,Dabrowski, T.,Umgiesser, G.,Staneva, J.,Ursella, L.,Pairaud, I.,Bruschi, A.,Frigstad, H.,Baetens, K.,Creach, V.,Charria, G.,Alvarez Fanjul, E. %D 2023 %J Frontiers in Marine Science %N %P 1177615 %R doi:10.3389/fmars.2023.1177615 %T EuroGOOS roadmap for operational coastal downstream services %U https://doi.org/10.3389/fmars.2023.1177615 %X The EuroGOOS Coastal working group examines the entire coastal value chain from coastal observations to services for coastal users. The main objective of the working group is to review the status quo, identify gaps and future steps needed to secure and improve the sustainability of the European coastal service provision. Within this framework, our white paper defines a EuroGOOS roadmap for sustained “community coastal downstream service” provision, provided by a broad EuroGOOS community with focus on the national and local scale services. After defining the coastal services in this context, we describe the main components of coastal service provision and explore community benefits and requirements through sectoral examples (aquaculture, coastal tourism, renewable energy, port, cross-sectoral) together with the main challenges and barriers to user uptake. Technology integration challenges are outlined with respect to multiparameter observations, multi-platform observations, the land-coast-ocean continuum, and multidisciplinary data integration. Finally, the technological, financial, and institutional sustainability of coastal observing and coastal service provision are discussed. The paper gives special attention to the delineation of upstream and downstream services, public-private partnerships and the important role of Copernicus in better covering the coastal zone. Therefore, our white paper is a policy and practice review providing a comprehensive overview, in-depth discussion and actionable recommendations (according to key short-term or medium-term priorities) on the envisaged elements of a roadmap for sustained coastal service provision. EuroGOOS, as an entity that unites European national operational oceanography centres, research institutes and scientists across various domains within the broader field of operational oceanography, offers to be the engine and intermediary for the knowledge transfer and communication of experiences, best practices and information, not only amongst its members, but also amongst the different (research) infrastructures, institutes and agencies that have interests in coastal oceanography in Europe. %0 journal article %@ 2059-4798 %A Bustamante, M.,Roy, J.,Ospina, D.,Achakulwisut, P.,Aggarwal, A.,Bastos, A.,Broadgate, W.,Canadell, J.G.,Carr, E.R.,Chen, D.,Cleugh, H.A.,Ebi, K.L.,Edwards, C.,Farbotko, C.,Fernández-Martínez, M.,Frölicher, T.L.,Fuss, S.,Geden, O.,Gruber, N.,Harrington, L.J.,Hauck, J.,Hausfather, Z.,Hebden, S.,Hebinck, A.,Huq, S.,Huss, M.,Jamero, M.L.P.,Juhola, S.,Kumarasinghe, N.,Lwasa, S.,Mallick, B.,Martin, M.,McGreevy, S.,Mirazo, P.,Mukherji, A.,Muttitt, G.,Nemet, G.F.,Obura, D.,Okereke, C.,Oliver, T.,Orlove, B.,Ouedraogo, N.S.,Patra, P.K.,Pelling, M.,Pereira, L.M.,Persson, Å.,Pongratz, J.,Prakash, A.,Rammig, A.,Raymond, C.,Redman, A.,Reveco, C.,Rockström, J.,Rodrigues, R.,Rounce, D.R.,Schipper, E. L.F.,Schlosser, P.,Selomane, O.,Semieniuk, G.,Shin, Y.-J.,Siddiqui, T.A.,Singh, V.,Sioen, G.B.,Sokona, Y.,Stammer, D.,Steinert, N.J.,Suk, S.,Sutton, R.,Thalheimer, L.,Thompson, V.,Trencher, G.,van der Geest, K.,Werners, S.E.,Wunderling, N.,Wübbelmann, T.,Yin, J.,Zickfeld, K.,Zscheischler, J. %D 2023 %J Global Sustainability %N %P %R doi:10.1017/sus.2023.25 %T Ten New Insights in Climate Science 2023/2024 %U https://doi.org/10.1017/sus.2023.25 %X We identify a set of essential recent advances in climate change research with high policy relevance, across natural and social sciences: (1) looming inevitability and implications of overshooting the 1.5°C warming limit, (2) urgent need for a rapid and managed fossil fuel phase-out, (3) challenges for scaling carbon dioxide removal, (4) uncertainties regarding the future contribution of natural carbon sinks, (5) intertwinedness of the crises of biodiversity loss and climate change, (6) compound events, (7) mountain glacier loss, (8) human immobility in the face of climate risks, (9) adaptation justice, and (10) just transitions in food systems. %0 dataset %@ %A Bakker, D.C.E.,Alin, S.R.,Bates, N.,Becker, M.,Feely, R.A.,Gkritzalis, T.,Jones, S.D.,Kozyr, A.,Lauvset, S.K.,Metzl, N.,Munro, D.R.,Nakaoka, S.,Nojiri, Y.,O'Brien, K.M.,Olsen, A.,other authors, o.,Macovei, V.,Voynova, Y.,Petersen, W.,Gehrung, M.,Pierrot, D.,Rehder, G.,Steinhoff, T.,Sutton, A.J.,Sweeney, C.,Tilbrook, B.,Wada, C.,Wanninkhof, R.,Akl, J.,Barbero, L.,Beatty, C.M.,Berghoff, C.F.,Bittig, H.C.,Bott, R.,Burger, E.F.,Cai, W.J.,Castaño-Primo, R.,Corredor, J.E.,Cronin, M.,De Carlo, E.H.,DeGrandpre, M.D.,Dietrich, C.,Drennan, W.M.,Emerson, S.R.,Enochs, I.C.,Enyo, K.,Epherra, L.,Evans, W.,Fiedler, B.,Fontela, M.,Frangoulis, C.,Giannoudi, L.,Glockzin, M.,Hales, B.,Howden, S.D.,Ibánhez, J.S.P.,Kamb, L.,Körtzinger, A.,Lefèvre, N.,Lo Monaco, C.,Lutz, V.A.,Macovei, V.A.,Maenner Jones, S.,Manalang, D.,Manzello, D.P.,Mickett, J.,Millero, F.J.,Monacci, N.M.,Morell, J.M.,Musielewicz, S.,Neill, C.,Newberger, T.,Newton, J.,Noakes, S.,Ólafsdóttir, S.R.,Ono, T.,Osborne, J.,Padín, X.A.,Paulsen, M.,Perivoliotis, L.,Petihakis, G.,Plueddemann, A.J.,Rodriguez, C.,Rutgersson, A.,Sabine, C.L.,Salisbury, J.E.,Schlitzer, R.,Skjelvan, I.,Stamataki, N.,Sullivan, K.F.,Sutherland, S.C.,T'Jampens, M.,Tadokoro, K.,Tanhua, T.,Telszewski, M.,Theetaert, H.,Tomlinson, M.,Vandemark, D.,Velo, A.,Voynova, Y.G.,Weller, R.A.,Whitehead, C.,Wimart-Rousseau, C. %D 2023 %J NOAA NCEI: National Centers for Environmental Information %N %P %R doi:10.25921/r7xa-bt92 %T Surface Ocean CO2 Atlas Database Version 2023 (SOCATv2023) (NCEI Accession 0278913) %U https://doi.org/10.25921/r7xa-bt92 %X %0 journal article %@ 1991-959X %A Karl, M.,Pirjola, L.,Grönholm, T.,Kurppa, M.,Anand, S.,Zhang, X.,Held, A.,Sander, R.,Dal Maso, M.,Topping, D.,Jiang, S.,Kangas, L.,Kukkonen, J. %D 2022 %J Geoscientific Model Development %N 9 %P 3969-4026 %R doi:10.5194/gmd-15-3969-2022 %T Description and evaluation of the community aerosol dynamics model MAFOR v2.0 %U https://doi.org/10.5194/gmd-15-3969-2022 9 %X Numerical models are needed for evaluating aerosol processes in the atmosphere in state-of-the-art chemical transport models, urban-scale dispersion models, and climatic models. This article describes a publicly available aerosol dynamics model, MAFOR (Multicomponent Aerosol FORmation model; version 2.0); we address the main structure of the model, including the types of operation and the treatments of the aerosol processes. The model simultaneously solves the time evolution of both the particle number and the mass concentrations of aerosol components in each size section. In this way, the model can also allow for changes in the average density of particles. An evaluation of the model is also presented against a high-resolution observational dataset in a street canyon located in the centre of Helsinki (Finland) during afternoon traffic rush hour on 13 December 2010. The experimental data included measurements at different locations in the street canyon of ultrafine particles, black carbon, and fine particulate mass PM1. This evaluation has also included an intercomparison with the corresponding predictions of two other prominent aerosol dynamics models, AEROFOR and SALSA. All three models simulated the decrease in the measured total particle number concentrations fairly well with increasing distance from the vehicular emission source. The MAFOR model reproduced the evolution of the observed particle number size distributions more accurately than the other two models. The MAFOR model also predicted the variation of the concentration of PM1 better than the SALSA model. We also analysed the relative importance of various aerosol processes based on the predictions of the three models. As expected, atmospheric dilution dominated over other processes; dry deposition was the second most significant process. Numerical sensitivity tests with the MAFOR model revealed that the uncertainties associated with the properties of the condensing organic vapours affected only the size range of particles smaller than 10 nm in diameter. These uncertainties therefore do not significantly affect the predictions of the whole of the number size distribution and the total number concentration. The MAFOR model version 2 is well documented and versatile to use, providing a range of alternative parameterizations for various aerosol processes. The model includes an efficient numerical integration of particle number and mass concentrations, an operator splitting of processes, and the use of a fixed sectional method. The model could be used as a module in various atmospheric and climatic models. %0 journal article %@ 2212-9820 %A Escorihuela, S.,Cerdá-Moreno, C.,Weigelt, F.,Remiro-Buenamanana, S.,Escolástico, S.,Tena, A.,Shishatskiy, S.,Brinkmann, T.,Chica, A.,M. Serrra, J. %D 2022 %J Journal of CO2 Utilization %N %P 101813 %R doi:10.1016/j.jcou.2021.101813 %T Intensification of catalytic CO2 methanation mediated by in-situ water removal through a high-temperature polymeric thin-film composite membrane %U https://doi.org/10.1016/j.jcou.2021.101813 %X Catalytic CO2 methanation technology can be improved by process intensification, i.e. enabling higher energy efficiency and process sustainability. Here, thin-film composite membranes (TFCM) were developed for in-situ water removal in a catalytic membrane reactor (CMR) for the Sabatier process. The selective separation layer (1.4 μm-thick) of the composite membrane is made of the polyimide 6FDA-6FpDA, a glassy polyimide, which exhibits high permeability and selectivity together with stable function at unprecedented high temperatures (>200 °C), compared to polyimides reported until now (90 °C), thus matching the temperature range of Sabatier reactors. Remarkably, TFCM developed in this work, allow to extract an outstanding amount of water up to 1 m3/(m2·h·bar) at 260 °C. TFCM was implemented for the water removal from the methanation reaction in a CMR operated at 260 °C and using Ni-Todorokite as catalyst. The TFCM-mediated water-extraction enabled to raise both catalytic stability and activity during CMR operation. CO2 conversion stability was greatly improved exhibiting a conversion value of 72 % during the course of the reaction (21 % increase in CO2 conversion), with a water removal of 12.5 % and specific flux of ∼100 g·h−1 m−2. %0 journal article %@ 0370-1972 %A Kreuzpaintner, W.,Schmehl, A.,Book, A.,Mairoser, T.,Ye, J.,Wiedemann, B.,Mayr, S.,Moulin, J.-F.,Stahn, J.,Gilbert, D.A.,Gabold, H.,Inanloo-Maranloo, Z.,Heigl, M.,Masalovich, S.,Georgii, R.,Albrecht, M.,Mannhart, J.,Böni, P. %D 2022 %J Physica Status Solidi B %N 5 %P 2100153 %R doi:10.1002/pssb.202100153 %T Reflectometry with Polarized Neutrons on In Situ Grown Thin Films %U https://doi.org/10.1002/pssb.202100153 5 %X Originating from the demand for obtaining depth-resolved magnetization profiles from thin films and heterostructures, polarized neutron reflectometry (PNR) has developed into a unique research tool, which also finds application in the analysis of superconducting or soft matter thin films. While certain in situ sample environments such as gas-loading or humidity cells were quickly realized after PNR first emerged, preparing and growing thin magnetic films directly in the neutron beam could only be realized in recent years. Herein, a dedicated insight is given on the history and development of in situ thin film growth capabilities for PNR, from early pioneering experiments to the present day. The scientific and technological challenges as well as the advances of neutron sources, neutronics, and data treatment that have led to its realization are highlighted together with the unique research opportunities that it provides and recently obtained experimental results. %0 journal article %@ 1359-6462 %A Victoria-Hernandez, J.,Yi, S.,Letzig, D. %D 2022 %J Scripta Materialia %N %P 114322 %R doi:10.1016/j.scriptamat.2021.114322 %T Role of non-basal slip systems on the microstructure and texture development of ZXK-Mg alloy deformed in Plane Strain Compression at elevated temperature %U https://doi.org/10.1016/j.scriptamat.2021.114322 %X This work investigates the deformation mechanisms active during high temperature plane strain compression and their impact on the microstructural and texture evolution of an Mg-Zn-Ca-Zr (ZXK) alloy. The microstructures of samples deformed at different strains and different loading directions were examined using electron backscatter diffraction measurements. Likely activated slip systems in grains and twins were determined by in-grain misorientation axis (IGMA), and their activity was compared to the simulation results using the Viscoplastic Self-Consistent (VPSC) model. The importance of the active deformation modes on texture development, specifically the formation of particular texture components, has been linked with a profuse activity of non-basal dislocations and the preferential activation of pyramidal I slip over pyramidal II slip. Along with prismatic slip, the activation of {} twins and pyramidal slip seems to be pivotal for the stabilization of the so-called TD-texture component in a specific loading configuration. %0 journal article %@ 2399-7532 %A Mazzolai, B.,Mondini, A.,Del Dottore, E.,Margheri, L.,Carpi, F.,Suzumori, K.,Cianchetti, M.,Speck, T.,Smoukov, S.K.,Burgert, I.,Keplinger, T.,Siqueira, G.D.F.,Vanneste, F.,Goury, O.,Duriez, C.,Nanayakkara, T.,Vanderborght, B.,Brancart, J.,Terryn, S.,Rich, S.I.,Liu, R.,Fukuda, K.,Someya, T.,Calisti, M.,Laschi, C.,Sun, W.,Wang, G.,Wen, L.,Baines, R.,Patiballa, S.K.,Kramer-Bottiglio, R.,Rus, D.,Fischer, P.,Simmel, F.C.,Lendlein, A. %D 2022 %J Multifunctional Materials %N 3 %P 032001 %R doi:10.1088/2399-7532/ac4c95 %T Roadmap on soft robotics: multifunctionality, adaptability and growth without borders %U https://doi.org/10.1088/2399-7532/ac4c95 3 %X Soft robotics aims at creating systems with improved performance of movement and adaptability in unknown, challenging, environments and with higher level of safety during interactions with humans. This Roadmap on Soft Robotics covers selected aspects for the design of soft robots significantly linked to the area of multifunctional materials, as these are considered a fundamental component in the design of soft robots for an improvement of their peculiar abilities, such as morphing, adaptivity and growth. The roadmap includes different approaches for components and systems design, bioinspired materials, methodologies for building soft robots, strategies for the implementation and control of their functionalities and behaviour, and examples of soft-bodied systems showing abilities across different environments. For each covered topic, the author(s) describe the current status and research directions, current and future challenges, and perspective advances in science and technology to meet the challenges. %0 journal article %@ 2213-9567 %A Cai, L.,Mei, D.,Zhang, Z.-Q.,Huang, Y.-D.,Cui, L.-Y.,Guan, S.-K.,Chen, D.-C.,Kannan, M.B.,Zheng, Y.-F.,Zeng, R.-C. %D 2022 %J Journal of Magnesium and Alloys %N 3 %P 670-688 %R doi:10.1016/j.jma.2022.02.005 %T Advances in bioorganic molecules inspired degradation and surface modifications on Mg and its alloys %U https://doi.org/10.1016/j.jma.2022.02.005 3 %X Mg alloys possess biodegradability, suitable mechanical properties, and biocompatibility, which make them possible to be used as biodegradable implants. However, the uncontrollable degradation of Mg alloys limits their general applications. In addition to the factors from the metallic materials themselves, like alloy compositions, heat treatment process and microstructure, some external factors, relating to the test/service environment, also affect the degradation rate of Mg alloys, such as inorganic salts, bioorganic small molecules, bioorganic macromolecules. The influence of bioorganic molecules on Mg corrosion and its protection has attracted more and more attentions. In this work, the cutting-edge advances in the influence of bioorganic molecules (i.e., protein, glucose, amino acids, vitamins and polypeptide) and their coupling effect on Mg degradation and the formation of protection coatings were reviewed. The research orientations of biomedical Mg alloys in exploring degradation mechanisms in vitro were proposed, and the impact of bioorganic molecules on the protective approaches were also explored. %0 journal article %@ 1996-1944 %A Millán-Ramos, B.,Morquecho-Marín, D.,Silva-Bermudez, P.,Ramírez-Ortega, D.,Depablos-Rivera, O.,García-López, J.,Fernández-Lizárraga, M.,Almaguer-Flores, A.,Victoria-Hernández, J.,Letzig, D.,Rodil, S. %D 2022 %J Materials %N 9 %P 3142 %R doi:10.3390/ma15093142 %T Degradation Behavior and Mechanical Integrity of a Mg-0.7Zn-0.6Ca (wt.%) Alloy: Effect of Grain Sizes and Crystallographic Texture %U https://doi.org/10.3390/ma15093142 9 %X The microstructural characteristics of biodegradable Mg alloys determine their performance and appropriateness for orthopedic fixation applications. In this work, the effect of the annealing treatment of a Mg-0.7Zn-0.6Ca (ZX11) alloy on the mechanical integrity, corrosive behavior, and biocompatibility-osteoinduction was studied considering two annealing temperatures, 350 and 450 °C. The microstructure showed a recrystallized structure, with a lower number of precipitates, grain size, and stronger basal texture for the ZX11-350 condition than the ZX11-450. The characteristics mentioned above induce a higher long-term degradation rate for the ZX11-450 than the ZX11-350 on days 7th and 15th of immersion. In consequence, the mechanical integrity changes within this period. The increased degradation rate of the ZX11-450 condition reduces 40% the elongation at failure, in contrast with the 16% reduction for the ZX11-350 condition. After that period, the mechanical integrity remained unchanged. No cytotoxic effects were observed for both treatments and significant differentiation of mesenchymal stem cells into the osteoblast phenotype was observed. %0 journal article %@ 2516-1083 %A Dornheim, M.,Baetcke, L.,Akiba, E.,Ares, J.,Autrey, T.,Barale, J.,Baricco, M.,Brooks, K.,Chalkiadakis, N.,Charbonnier, V.,Christensen, S.,Bellosta von Colbe, J.,Costamagna, M.,Dematteis, E.,Fernández, J.,Gennett, T.,Grant, D.,Heo, T.,Hirscher, M.,Hurst, K.,Lototskyy, M.,Metz, O.,Rizzi, P.,Sakaki, K.,Sartori, S.,Stamatakis, E.,Stuart, A.,Stubos, A.,Walker, G.,Webb, C.,Wood, B.,Yartys, V.,Zoulias, E. %D 2022 %J Progress in Energy %N 4 %P 042005 %R doi:10.1088/2516-1083/ac7cb7 %T Research and development of hydrogen carrier based solutions for hydrogen compression and storage %U https://doi.org/10.1088/2516-1083/ac7cb7 4 %X Recently, the industrial and public interest in hydrogen technologies has strongly risen, since hydrogen is the ideal means for medium to long term energy storage, transport and usage in combination with renewable and green energy supply. Therefore, in a future energy system the production, storage and usage of green hydrogen is a key technology. Hydrogen is and will in future be even more used for industrial production processes as reduction agent or for the production of synthetic hydrocarbons, especially in the chemical industry and refineries. Under certain conditions material based systems for hydrogen storage and compression offer advantages over the classical systems based on gaseous or liquid hydrogen. This includes in particular lower maintenance costs, higher reliability and safety. Hydrogen storage is possible at pressures and temperatures much closer to ambient conditions. Hydrogen compression is possible without any moving parts and only by using waste heat. In this paper, the newest developments of hydrogen carriers for storage and compression are summarized. In addition, an overview of the different research activities in this field are given. %0 journal article %@ 2516-1083 %A Pasquini, L.,Sakaki, K.,Akiba, E.,Allendorf, M.D.,Alvares, E.,Ares, J.R.,Babai, D.,Baricco, M.,Bellosta Von Colbe, J.,Bereznitsky, M.,Buckley, C.E.,Cho, Y.W.,Cuevas, F.,De Rango, P.,Dematteis, E.M.,Denys, R.V.,Dornheim, M.,Fernández, J.F.,Hariyadi, A.,Hauback, B.C.,Heo, T.W.,Hirscher, M.,Humphries, T.D.,Huot, J.,Jacob, I.,Jensen, T.R.,Jerabek, P.,Kang, S.Y.,Keilbart, N.,Kim, H.,Latroche, M.,Leardini, F.,Li, H.,Ling, S.,Lototskyy, M.V.,Mullen, R.,Orimo, S.-I.,Paskevicius, M.,Pistidda, C.,Polanski, M.,Puszkiel, J.,Rabkin, E.,Sahlberg, M.,Sartori, S.,Santhosh, A.,Sato, T.,Shneck, R.Z.,Sørby, M.H.,Shang, Y.,Stavila, V.,Suh, J.-Y.,Suwarno, S.,Thi Thu, L.,Wan, L.F.,Webb, C.J.,Witman, M.,Wan, C.,Wood, B.C.,Yartys, V.A. %D 2022 %J Progress in Energy %N 3 %P 032007 %R doi:10.1088/2516-1083/ac7190 %T Magnesium- and intermetallic alloys-based hydrides for energy storage: modelling, synthesis and properties %U https://doi.org/10.1088/2516-1083/ac7190 3 %X Hydrides based on magnesium and intermetallic compounds provide a viable solution to the challenge of energy storage from renewable sources, thanks to their ability to absorb and desorb hydrogen in a reversible way with a proper tuning of pressure and temperature conditions. Therefore, they are expected to play an important role in the clean energy transition and in the deployment of hydrogen as an efficient energy vector. This review, by experts of Task 40 'Energy Storage and Conversion based on Hydrogen' of the Hydrogen Technology Collaboration Programme of the International Energy Agency, reports on the latest activities of the working group 'Magnesium- and Intermetallic alloys-based Hydrides for Energy Storage'. The following topics are covered by the review: multiscale modelling of hydrides and hydrogen sorption mechanisms; synthesis and processing techniques; catalysts for hydrogen sorption in Mg; Mg-based nanostructures and new compounds; hydrides based on intermetallic TiFe alloys, high entropy alloys, Laves phases, and Pd-containing alloys. Finally, an outlook is presented on current worldwide investments and future research directions for hydrogen-based energy storage. %0 journal article %@ 0003-0007 %A Diez-Sierra, J.,Iturbide, M.,Gutiérrez, J. M.,Fernández, J.,Milovac, J.,Cofiño, A. S.,Cimadevilla, E.,Nikulin, G.,Levavasseur, G.,Kjellström, E.,Bülow, K.,Horányi, A.,Brookshaw, A.,García-Díez, M.,Pérez, A.,Baño-Medina, J.,Ahrens, B.,Alias, A.,Ashfaq, M.,Bukovsky, M.,Buonomo, E.,Caluwaerts, S.,Chan Chou, S.,Christensen, O. B.,Ciarlo´, J. M.,Coppola, E.,Corre, L.,Demory, M.,Djurdjevic, V.,Evans, J. P.,Fealy, R.,Feldmann, H.,Jacob, D.,Jayanarayanan, S.,Katzfey, J.,Keuler, K.,Kittel, C.,Levent Kurnaz, M.,Laprise, R.,Lionello, P.,McGinnis, S.,Mercogliano, P.,Nabat, P.,Önol, B.,Ozturk, T.,Panitz, H.,Paquin, D.,Pieczka, I.,Raffaele, F.,Reca Remedio, A.,Scinocca, J.,Sevault, F.,Somot, S.,Steger, C.,Tangang, F.,Teichmann, C.,Termonia, P.,Thatcher, M.,Torma, C.,van Meijgaard, E.,Vautard, R.,Warrach-Sagi, K.,Winger, K.,Zittis, G. %D 2022 %J Bulletin of the American Meteorological Society %N 12 %P E2804-E2826 %R doi:10.1175/BAMS-D-22-0111.1 %T The Worldwide C3S CORDEX Grand Ensemble: A Major Contribution to Assess Regional Climate Change in the IPCC AR6 Atlas %U https://doi.org/10.1175/BAMS-D-22-0111.1 12 %X The collaboration between the Coordinated Regional Climate Downscaling Experiment (CORDEX) and the Earth System Grid Federation (ESGF) provides open access to an unprecedented ensemble of Regional Climate Model (RCM) simulations, across the 14 CORDEX continental-scale domains, with global coverage. These simulations have been used as a new line of evidence to assess regional climate projections in the latest contribution of the Working Group I (WGI) to the IPCC Sixth Assessment Report (AR6), particularly in the regional chapters and the Atlas.,Here, we present the work done in the framework of the Copernicus Climate Change Service (C3S) to assemble a consistent worldwide CORDEX grand ensemble, aligned with the deadlines and activities of IPCC AR6. This work addressed the uneven and heterogeneous availability of CORDEX ESGF data by supporting publication in CORDEX domains with few archived simulations and performing quality control. It also addressed the lack of comprehensive documentation by compiling information from all contributing regional models, allowing for an informed use of data. In addition to presenting the worldwide CORDEX dataset, we assess here its consistency for precipitation and temperature by comparing climate change signals in regions with overlapping CORDEX domains, obtaining overall coincident regional climate change signals. The C3S CORDEX dataset has been used for the assessment of regional climate change in the IPCC AR6 (and for the interactive Atlas) and is available through the Copernicus Climate Data Store (CDS). %0 journal article %@ 2046-2069 %A Thiel, T.,Zhang, X.,Radhakrishnan, B.,van de Krol, R.,Abdi, F.,Schroeter, M.,Schomäcker, R.,Schwarze, M. %D 2022 %J RSC Advances %N 48 %P 30860-30870 %R doi:10.1039/D2RA05507D %T Kinetic investigation of para-nitrophenol reduction with photodeposited platinum nanoparticles onto tunicate cellulose %U https://doi.org/10.1039/D2RA05507D 48 %X Photodeposition is a specific method for depositing metallic co-catalysts onto photocatalysts and was applied for immobilizing platinum nanoparticles onto cellulose, a photocatalytically inactive biopolymer. The obtained Pt@cellulose catalysts show narrow and well-dispersed nanoparticles with average sizes between 2 and 5 nm, whereby loading, size and distribution depend on the preparation conditions. The catalysts were investigated for the hydrogenation of para-nitrophenol via transfer hydrogenation using sodium borohydride as the hydrogen source, and the reaction rate constant was determined using the pseudo-first-order reaction rate law. The Pt@cellulose catalysts are catalytically active with rate constant values k from 0.09 × 10−3 to 0.43 × 10−3 min−1, which were higher than the rate constant of a commercial Pt@Al2O3 catalyst (k = 0.09 × 10−3 min−1). Additionally, the Pt@cellulose catalyst can be used for electrochemical hydrogenation of para-nitrophenol where the hydrogen is electrocatalytically formed. The electrochemical hydrogenation is faster compared to the transfer hydrogenation (k = 0.11 min−1). %0 journal article %@ 1674-4799 %A Ma, Y.,Souza Filho, I.R.,Zhang, X.,Nandy, S.,Barriobero-Vila, P.,Requena, G.,Vogel, D.,Rohwerder, M.,Ponge, D.,Springer, H.,Raabe, D. %D 2022 %J International Journal of Minerals, Metallurgy and Materials %N 10 %P 1901-1907 %R doi:10.1007/s12613-022-2440-5 %T Hydrogen-based direct reduction of iron oxide at 700°C: Heterogeneity at pellet and microstructure scales %U https://doi.org/10.1007/s12613-022-2440-5 10 %X Steel production causes a third of all industrial CO2 emissions due to the use of carbon-based substances as reductants for iron ores, making it a key driver of global warming. Therefore, research efforts aim to replace these reductants with sustainably produced hydrogen. Hydrogen-based direct reduction (HyDR) is an attractive processing technology, given that direct reduction (DR) furnaces are routinely operated in the steel industry but with CH4 or CO as reductants. Hydrogen diffuses considerably faster through shaft-furnace pellet agglomerates than carbon-based reductants. However, the net reduction kinetics in HyDR remains extremely sluggish for high-quantity steel production, and the hydrogen consumption exceeds the stoichiometrically required amount substantially. Thus, the present study focused on the improved understanding of the influence of spatial gradients, morphology, and internal microstructures of ore pellets on reduction efficiency and metallization during HyDR. For this purpose, commercial DR pellets were investigated using synchrotron high-energy X-ray diffraction and electron microscopy in conjunction with electron backscatter diffraction and chemical probing. Revealing the interplay of different phases with internal interfaces, free surfaces, and associated nucleation and growth mechanisms provides a basis for developing tailored ore pellets that are highly suited for a fast and efficient HyDR. %0 journal article %@ 1866-3508 %A Valente, A.,Sathyendranath, S.,Brotas, V.,Groom, S.,Grant, M.,Jackson, T.,Chuprin, A.,Taberner, M.,Airs, R.,Antoine, D.,Arnone, R.,Balch, W. M.,Barker, K.,Barlow, R.,Bélanger, S.,Berthon, J.-F.,Beşiktepe, Ş.,Borsheim, Y.,Bracher, A.,Brando, V.,Brewin, R. J. W.,Canuti, E.,Chavez, F. P.,Cianca, A.,Claustre, H.,Clementson, L.,Crout, R.,Ferreira, A.,Freeman, S.,Frouin, R.,García-Soto, C.,Gibb, S. W.,Goericke, R.,Gould, R.,Guillocheau, N.,Hooker, S. B.,Hu, C.,Kahru, M.,Kampel, M.,Klein, H.,Kratzer, S.,Kudela, R.,Ledesma, J.,Lohrenz, S.,Loisel, H.,Mannino, A.,Martinez-Vicente, V.,Matrai, P.,McKee, D.,Mitchell, B. G.,Moisan, T.,Montes, E.,Muller-Karger, F.,Neeley, A.,Novak, M.,O'Dowd, L.,Ondrusek, M.,Platt, T.,Poulton, A. J.,Repecaud, M.,Röttgers, R.,Schroeder, T.,Smyth, T.,Smythe-Wright, D.,Sosik, H. M.,Thomas, C.,Thomas, R.,Tilstone, G.,Tracana, A.,Twardowski, M.,Vellucci, V.,Voss, K.,Werdell, J.,Wernand, M.,Wojtasiewicz, B.,Wright, S.,Zibordi, G. %D 2022 %J Earth System Science Data %N 12 %P 5737-5770 %R doi:10.5194/essd-14-5737-2022 %T A compilation of global bio-optical in situ data for ocean colour satellite applications – version three %U https://doi.org/10.5194/essd-14-5737-2022 12 %X A global in situ data set for validation of ocean colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI) is presented. This version of the compilation, starting in 1997, now extends to 2021, which is important for the validation of the most recent satellite optical sensors such as Sentinel 3B OLCI and NOAA-20 VIIRS. The data set comprises in situ observations of the following variables: spectral remote-sensing reflectance, concentration of chlorophyll-a, spectral inherent optical properties, spectral diffuse attenuation coefficient, and total suspended matter. Data were obtained from multi-project archives acquired via open internet services or from individual projects acquired directly from data providers. Methodologies were implemented for homogenization, quality control, and merging of all data. Minimal changes were made on the original data, other than conversion to a standard format, elimination of some points, after quality control and averaging of observations that were close in time and space. The result is a merged table available in text format. Overall, the size of the data set grew with 148 432 rows, with each row representing a unique station in space and time (cf. 136 250 rows in previous version; Valente et al., 2019). Observations of remote-sensing reflectance increased to 68 641 (cf. 59 781 in previous version; Valente et al., 2019). There was also a near tenfold increase in chlorophyll data since 2016. Metadata of each in situ measurement (original source, cruise or experiment, principal investigator) are included in the final table. By making the metadata available, provenance is better documented and it is also possible to analyse each set of data separately. The compiled data are available at https://doi.org/10.1594/PANGAEA.941318 (Valente et al., 2022). %0 book part %@ %A Ebinghaus, R.,Grøsvik, B.,Hassellöv, I.,Moffat, C.,Simcock, A.,Sonesten, L.,Vlahos, P.,Achterberg, E.,Alo, B.,Andrade, C.,Bebianno, M.,Caetano, M.,Gnandi, K.,Hong, G.,Kim, S.,Lohmann, R.,Stankiewicz, M.,Wang, J. %D 2021 %J The Second World Ocean Assessment %N %P 101-150 %T Chapter 11: Changes in liquid and atmospheric inputs to the marine environment from land (including through groundwater), ships and offshore installations %U %X Chemical production has continued to in-crease and change since 2003. The potential geographic impact of the chemical industry continued to change from the Atlantic Ocean to the Pacific Ocean, where almost 70 per cent of the industry is expected to operate by 2030, while new products are continually being devel-oped, thus adding to the mixture of chemicals to which biota in the ocean is being exposed.Different lists of hazardous substances have been identified by international organizations, although there is still no agreed single global list of substances that are of concern. The present chapter contains an assessment of the changes since the first Assessment in wa-ter and airborne inputs to the marine environ-ment from land (including groundwater), ships and offshore installations. In addition, the information in the present chapter builds upon the assessment of the list of hazardous sub-stances used in the first Assessment, namely, POPs, metals, hydrocarbons and radioactive substances. It includes new information on rare earth elements, PPCPs and airborne in-puts of nitrogen oxides and sulfur oxides that were not included in the first Assessment. %0 journal article %@ 1758-678X %A Zhou, S.,William, A.,Lintner, B.,Berg, A.,Zhang, Y.,Keenan, T.,Cook, B.,Hagemann, S.,Seneviratne, S.,Gentine, P. %D 2021 %J Nature Climate Change %N %P 38-44 %R doi:10.1038/s41558-020-00945-z %T Soil moisture–atmosphere feedbacks mitigate declining water availability in drylands %U https://doi.org/10.1038/s41558-020-00945-z %X Global warming alters surface water availability (precipitation minus evapotranspiration, P–E) and hence freshwater resources. However, the influence of land–atmosphere feedbacks on future P–E changes and the underlying mechanisms remain unclear. Here we demonstrate that soil moisture (SM) strongly impacts future P–E changes, especially in drylands, by regulating evapotranspiration and atmospheric moisture inflow. Using modelling and empirical approaches, we find a consistent negative SM feedback on P–E, which may offset ~60% of the decline in dryland P–E otherwise expected in the absence of SM feedbacks. The negative feedback is not caused by atmospheric thermodynamic responses to declining SM; rather, reduced SM, in addition to limiting evapotranspiration, regulates atmospheric circulation and vertical ascent to enhance moisture transport into drylands. This SM effect is a large source of uncertainty in projected dryland P–E changes, underscoring the need to better constrain future SM changes and improve the representation of SM–atmosphere processes in models. %0 journal article %@ 2059-4798 %A Pihl, E.,Alfredsson, E.,Bengtsson, M.,Bowen, K.J.,Cástan Broto, V.,Chou, K.T.,Cleugh, H.,Ebi, K.,Edwards, C.M.,Fisher, E.,Friedlingstein, P.,Godoy-Faúndez, A.,Gupta, M.,Harrington, A.R.,Hayes, K.,Hayward, B.M.,Hebden, S.R.,Hickmann, T.,Hugelius, G.,Ilyina, T.,Jackson, R.B.,Keenan, T.F.,Lambino, R.A.,Leuzinger, S.,Malmaeus, M.,McDonald, R.I.,McMichael, C.,Miller, C.A.,Muratori, M.,Nagabhatla, N.,Nagendra, H.,Passarello, C.,Penuelas, J.,Pongratz, J.,Rockström, J.,Romero-Lankao, P.,Roy, J.,Scaife, A.A.,Schlosser, P.,Schuur, E.,Scobie, M.,Sherwood, S.C.,Sioen, G.B.,Skovgaard, J.,Sobenes Obregon, E.A.,Sonntag, S.,Spangenberg, J.H.,Spijkers, O.,Srivastava, L.,Stammer, D.B.,Torres, P.H.C.,Turetsky, M.R.,Ukkola, A.M.,Van Vuuren, D.P.,Voigt, C.,Wannous, C.,Zelinka, M.D. %D 2021 %J Global Sustainability %N %P E5 %R doi:10.1017/sus.2021.2 %T Ten new insights in climate science 2020 – a horizon scan %U https://doi.org/10.1017/sus.2021.2 %X Non-technical summary We summarize some of the past year's most important findings within climate change-related research. New research has improved our understanding of Earth's sensitivity to carbon dioxide, finds that permafrost thaw could release more carbon emissions than expected and that the uptake of carbon in tropical ecosystems is weakening. Adverse impacts on human society include increasing water shortages and impacts on mental health. Options for solutions emerge from rethinking economic models, rights-based litigation, strengthened governance systems and a new social contract. The disruption caused by COVID-19 could be seized as an opportunity for positive change, directing economic stimulus towards sustainable investments. Technical summary A synthesis is made of ten fields within climate science where there have been significant advances since mid-2019, through an expert elicitation process with broad disciplinary scope. Findings include: (1) a better understanding of equilibrium climate sensitivity; (2) abrupt thaw as an accelerator of carbon release from permafrost; (3) changes to global and regional land carbon sinks; (4) impacts of climate change on water crises, including equity perspectives; (5) adverse effects on mental health from climate change; (6) immediate effects on climate of the COVID-19 pandemic and requirements for recovery packages to deliver on the Paris Agreement; (7) suggested long-term changes to governance and a social contract to address climate change, learning from the current pandemic, (8) updated positive cost-benefit ratio and new perspectives on the potential for green growth in the short- A nd long-term perspective; (9) urban electrification as a strategy to move towards low-carbon energy systems and (10) rights-based litigation as an increasingly important method to address climate change, with recent clarifications on the legal standing and representation of future generations. Social media summary Stronger permafrost thaw, COVID-19 effects and growing mental health impacts among highlights of latest climate science. %0 journal article %@ 2325-1026 %A Duke, P.,Else, B.,Jones, S.,Marriot, S.,Ahmed, M.,Nandan, V.,Butterworth, B.,Gonski, S.,Dewey, R.,Sastri, A.,Miller, L.,Simpson, K.,Thomas, H. %D 2021 %J Elementa: Science of the Anthropocene %N 1 %P 00103 %R doi:10.1525/elementa.2021.00103 %T Seasonal marine carbon system processes in an Arctic coastal landfast sea ice environment observed with an innovative underwater sensor platform %U https://doi.org/10.1525/elementa.2021.00103 1 %X Studying carbon dioxide in the ocean helps to understand how the ocean will be impacted by climate change and respond to increasing fossil fuel emissions. The marine carbonate system is not well characterized in the Arctic, where challenging logistics and extreme conditions limit observations of atmospheric CO2 flux and ocean acidification. Here, we present a high-resolution marine carbon system data set covering the complete cycle of sea-ice growth and melt in an Arctic estuary (Nunavut, Canada). This data set was collected through three consecutive yearlong deployments of sensors for pH and partial pressure of CO2 in seawater (pCO2sw) on a cabled underwater observatory. The sensors were remarkably stable compared to discrete samples: While corrections for offsets were required in some instances, we did not observe significant drift over the deployment periods. Our observations revealed a strong seasonality in this marine carbon system. Prior to sea-ice formation, air–sea gas exchange and respiration were the dominant processes, leading to increasing pCO2sw and reduced aragonite saturation state (ΩAr). During sea-ice growth, water column respiration and brine rejection (possibly enriched in dissolved inorganic carbon, relative to alkalinity, due to ikaite precipitation in sea ice) drove pCO2sw to supersaturation and lowered ΩAr to < 1. Shortly after polar sunrise, the ecosystem became net autotrophic, returning pCO2sw to undersaturation. The biological community responsible for this early switch to autotrophy (well before ice algae or phytoplankton blooms) requires further investigation. After sea-ice melt initiated, an under-ice phytoplankton bloom strongly reduced aqueous carbon (chlorophyll-a max of 2.4 µg L–1), returning ΩAr to > 1 after 4.5 months of undersaturation. Based on simple extrapolations of anthropogenic carbon inventories, we suspect that this seasonal undersaturation would not have occurred naturally. At ice breakup, the sensor platform recorded low pCO2sw (230 µatm), suggesting a strong CO2 sink during the open water season. %0 journal article %@ 2075-4701 %A Palacios Trujillo, C.,Victoria-Hernandez, J.,Hernandez-Silva, D.,Letzig, D.,Garcia-Bernal, M. %D 2021 %J Metals %N 4 %P 606 %R doi:10.3390/met11040606 %T Superplasticity at Intermediate Temperatures of ZK60 Magnesium Alloy Processed by Indirect Extrusion %U https://doi.org/10.3390/met11040606 4 %X Magnesium alloys usually exhibit excellent superplasticity at high temperature. However, many Mg alloys have poor formation ability near room temperature. Therefore, preparation of Mg alloys with suitable microstructures to show low or intermediate temperature superplasticity is an important goal. In this work, the superplastic behavior at intermediate temperatures of a commercial ZK60 magnesium alloy processed by indirect extrusion was investigated. After extrusion, the alloy showed a refined and homogeneous microstructure with an average grain size of 4 ± 2 μm. Overall texture measurement indicated that the alloy showed a strong prismatic texture with the highest intensity oriented to pole ⟨101¯0⟩. A texture component ⟨1¯21¯1⟩ parallel to the extrusion direction was found; this type of texture is commonly observed in Mg alloys with rare earth additions. Tensile tests were performed at temperatures of 150, 200, and 250 °C at three strain rates of 10−2, 10−3, and 10−4 s−1. A very high ductility was found at 250 °C and 10−4 s−1, resulting in an elongation to failure of 464%. Based on calculations of the activation energy and on interpretation of the deformation mechanism map for magnesium alloys, it was concluded that grain boundary sliding (GBS) is the dominant deformation mechanism. %0 journal article %@ 0930-7575 %A Ban, N.,Caillaud, C.,Coppola, E.,Pichelli, E.,Sobolowski, S.,Adinolfi, M.,Ahrens, B.,Alias, A.,Anders, I.,Bastin, S.,Belušić, D.,Berthou, S.,Brisson, E.,Cardoso, R.M.,Chan, S.C.,Christensen, O.B.,Fernández, J.,Fita, L.,Frisius, T.,Gašparac, G.,Giorgi, F.,Goergen, K.,Haugen, J.E.,Hodnebrog, Ø.,Kartsios, S.,Katragkou, E.,Kendon, E.J.,Keuler, K.,Lavin-Gullon, A.,Lenderink, G.,Leutwyler, D.,Lorenz, T.,Maraun, D.,Mercogliano, P.,Milovac, J.,Panitz, H.-J.,Raffa, M.,Remedio, A.R.,Schär, C.,Soares, P.M.M.,Srnec, L.,Steensen, B.M.,Stocchi, P.,Tölle, M.H.,Truhetz, H.,Vergara-Temprado, J.,de Vries, H.,Warrach-Sagi, K.,Wulfmeyer, V.,Zander, M.J. %D 2021 %J Climate Dynamics %N 1-2 %P 275-302 %R doi:10.1007/s00382-021-05708-w %T The first multi-model ensemble of regional climate simulations at kilometer-scale resolution, part I: evaluation of precipitation %U https://doi.org/10.1007/s00382-021-05708-w 1-2 %X 3 km, driven by ERA-Interim reanalysis, and performed by 22 European research groups are analysed. Six different regional climate models (RCMs) are represented in the ensemble. The simulations are compared against available high-resolution precipitation observations and coarse resolution (∼ %0 journal article %@ 0036-8075 %A Musser, J.M.,Schippers, K.J.,Nickel, M.,Mizzon, G.,Kohn, A.B.,Pape, C.,Ronchi, P.,Papadopoulos, N.,Tarashansky, A.J.,Hammel, J.U.,Wolf, F.,Liang, C.,Hernández-Plaza, A.,Cantalapiedra, C.P.,Achim, K.,Schieber, N.L.,Pan, L.,Ruperti, F.,Francis, W.R.,Vargas, S.,Kling, S.,Renkert, M.,Polikarpov, M.,Bourenkov, G.,Feuda, R.,Gaspar, I.,Burkhardt, P.,Wang, B.,Bork, P.,Beck, M.,Schneider, T.R.,Kreshuk, A.,Wörheide, G.,Huerta-Cepas, J.,Schwab, Y.,Moroz, L.L.,Arendt, D. %D 2021 %J Science %N 6568 %P 717-723 %R doi:10.1126/science.abj2949 %T Profiling cellular diversity in sponges informs animal cell type and nervous system evolution %U https://doi.org/10.1126/science.abj2949 6568 %X The evolutionary origin of metazoan cell types such as neurons and muscles is not known. Using whole-body single-cell RNA sequencing in a sponge, an animal without nervous system and musculature, we identified 18 distinct cell types. These include nitric oxide–sensitive contractile pinacocytes, amoeboid phagocytes, and secretory neuroid cells that reside in close contact with digestive choanocytes that express scaffolding and receptor proteins. Visualizing neuroid cells by correlative x-ray and electron microscopy revealed secretory vesicles and cellular projections enwrapping choanocyte microvilli and cilia. Our data show a communication system that is organized around sponge digestive chambers, using conserved modules that became incorporated into the pre- and postsynapse in the nervous systems of other animals. %0 journal article %@ 0273-1177 %A Dinardo, S.,Fenoglio-Marc, L.,Becker, M.,Fernandes, J.,Staneva, J.,Grayek, S.,Benveniste, J. %D 2021 %J Advances in Space Research %N 2 %P 892-929 %R doi:10.1016/j.asr.2020.06.004 %T A RIP-based SAR retracker and its application in North East Atlantic with Sentinel-3 %U https://doi.org/10.1016/j.asr.2020.06.004 2 %X Just as CryoSat-2, Sentinel-3 embarks on board a radar altimeter (SRAL) with the novel Synthetic Aperture Radar (SAR) mode that enables higher resolution and more accurate altimeter-derived parameters in the coastal zone, thanks to the reduced along-track footprint. Exploiting the SAR data in the recent years, many researchers have already proven that the performance of SAR altimetry with specific coastal retrackers is superior to collocated Pseudo-Low Resolution Mode (PLRM) coastal altimetry algorithms but they also pointed out that residual errors due to land contamination are still present in the very proximity of the land (0–3 km).,The objective of this work is to further improve these results by exploiting extra information provided by SAR altimeters, namely the so-called Range Integrated Power (RIP), the new waveform built by a simple integration of the Doppler beams in the range direction. The RIP characterizes the backscattering state of the ground cell, towards which all the Doppler beams have been steered. These developments lead to a new retracker, here coined SAMOSA++, in which the RIP, as computed from the L1B-S data, is converted into a surface backscattering profile and directly integrated in the SAMOSA retracker as part of the model formulation itself. In this way, the modified SAMOSA model is automatically and autonomously able to cope with the different return waveform shapes from different surface types: either diffusive or specular. The mean square slope computed from the RIP is also estimated, representing a new output of the retracker.,The performance of this new retracker is here cross-compared against its previous version, SAMOSA+, and against the standard Sentinel-3 marine PDGS (Payload Data Ground Segment) SAR retracker (SAMOSA2) in both coastal zone and open ocean in order to ensure a seamless transition between these zones.,The new retracker SAMOSA++ is validated in the North East Atlantic region, where appropriate in situ validation data are available. The retrievals from the new retracker are cross-compared against the network of tide gauges and buoys in the German Bight and versus the output of the GCOAST Helmholtz-Zentrum Geesthacht (HZG) regional circulation and wave model. In addition, sea level estimates derived with different ocean tide and wet path delay geophysical correction models are compared. Results indicate that in this region the best geophysical correction models are the FES2014b tide model and the GPD+ wet tropospheric correction that incorporates data from the Sentinel-3 on-board radiometer.,Analyses show that both SAMOSA+ and SAMOSA++ ensure the continuity of the PDGS SAR Marine retracker in the open ocean, leading to clear improvements in the coastal zone, larger for SAMOSA++ than for SAMOSA+. In summary, the new SAMOSA++ retracker retrieves more accurate altimetric parameters in the coastal zone, with a better consistency with respect to regional ocean models and in situ data. %0 journal article %@ 1047-4838 %A Victoria-Hernandez, J.,Kurz, G.,Bohlen, J.,Yi, S.,Letzig, D. %D 2021 %J JOM: The Journal of the Minerals, Metals and Materials Society %N 5 %P 1460-1470 %R doi:10.1007/s11837-021-04611-3 %T Influence of Twin-Roll Casting Speed on Microstructural Homogeneity, Centerline Segregation, and Surface Quality of Three Different Mg Alloys %U https://doi.org/10.1007/s11837-021-04611-3 5 %X In this work, the influence of twin-roll casting (TRC) speed on the microstructure of the through-thickness uniformity, centerline segregation, and surface quality of three wrought Mg alloys was investigated. The microstructural features of the AZ31, ZX11, and ZWK200 alloys produced at TRC speeds ranging from 1.8 m/min to 2.2 m/min (for the AZ31 and ZWK200), and 1.5–2.5 m/min (for the ZX11 alloy) were analyzed. There were clear differences in the microstructure uniformity depending on the alloy composition. Columnar grains coexisting with globular grains were found in the AZ31 and ZX11 alloys, whereas the ZWK200 alloy showed a homogeneous fine-grained microstructure characterized by a weaker texture even at the highest TRC speed used. While there is a tendency to reduce the centerline segregation as the TRC speed is decreased during casting of the AZ31 alloy, the formation of this defect cannot be prevented in the ZX11 and ZWK200 alloys by only varying the TRC speed. %0 journal article %@ 0899-8418 %A Spinoni, J.,Barbosa, P.,Bucchignani, E.,Cassano, J.,Cavazos, T.,Cescatti, A.,Christensen, J.H.,Christensen, O.B.,Coppola, E.,Evans, J.,Forzieri, G.,Geyer, B.,Giorgi, F.,Jacob, D.,Katzfey, J.,Koenigk, T.,Laprise, R.,Lennard, C.J.,Levent Kurnaz, M.,Li, D.,Llopart, M.,McCormick, N.,Naumann, G.,Nikulin, G.,Ozturk, T.,Panitz, H.-J.,da Rocha, R.P.,Solman, S.A.,Syktus, J.,Tangang, F.,Teichmann, C.,Vautard, R.,Vogt, J.V.,Winger, K.,Zittis, G.,Dosio, A. %D 2021 %J International Journal of Climatology %N 15 %P 6825-6853 %R doi:10.1002/joc.7302 %T Global exposure of population and land-use to meteorological droughts under different warming levels and SSPs: A CORDEX-based study %U https://doi.org/10.1002/joc.7302 15 %X Global warming is likely to cause a progressive drought increase in some regions, but how population and natural resources will be affected is still underexplored. This study focuses on global population, forests, croplands and pastures exposure to meteorological drought hazard in the 21st century, expressed as frequency and severity of drought events. As input, we use a large ensemble of climate simulations from the Coordinated Regional Climate Downscaling Experiment (CORDEX), population projections from the NASA-SEDAC dataset and land-use projections from the Land-Use Harmonization 2 project for 1981–2100. The exposure to drought hazard is presented for five Shared Socioeconomic Pathways (SSP1-SSP5) at four Global Warming Levels (GWLs: 1.5°C to 4°C). Results show that considering only Standardized Precipitation Index (SPI; based on precipitation), the SSP3 at GWL4 projects the largest fraction of the global population (14%) to experience an increase in drought frequency and severity (versus 1981–2010), with this value increasing to 60% if temperature is considered (indirectly included in the Standardized Precipitation-Evapotranspiration Index, SPEI). With SPEI, considering the highest GWL for each SSP, 8 (for SSP2, SSP4, SSP5) and 11 (SSP3) billion people, that is, more than 90%, will be affected by at least one unprecedented drought. For SSP5 at GWL4, approximately 2 × 106 km2 of forests and croplands (respectively, 6% and 11%) and 1.5 × 106 km2 of pastures (19%) will be exposed to increased drought frequency and severity according to SPI, but for SPEI this extent will rise to 17 × 106 km2 of forests (49%), 6 × 106 km2 of pastures (78%) and 12 × 106 km2 of croplands (67%), being mid-latitudes the most affected. The projected likely increase of drought frequency and severity significantly increases population and land-use exposure to drought, even at low GWLs, thus extensive mitigation and adaptation efforts are needed to avoid the most severe impacts of climate change. %0 journal article %@ 1991-959X %A Sørland, S.L.,Brogli, R.,Pothapakula, P.K.,Russo, E.,Van De Walle, J.,Ahrens, B.,Anders, I.,Bucchignani, E.,Davin, E.L.,Demory, M.-E.,Dosio, A.,Feldmann, H.,Früh, B.,Geyer, B.,Keuler, K.,Lee, D.,Li, D.,Van Lipzig, N.P.M.,Min, S.-K.,Panitz, H.-J.,Rockel, B.,Schär, C.,Steger, C.,Thiery, W. %D 2021 %J Geoscientific Model Development %N 8 %P 5125-5154 %R doi:10.5194/gmd-14-5125-2021 %T COSMO-CLM regional climate simulations in the Coordinated Regional Climate Downscaling Experiment (CORDEX) framework: a review %U https://doi.org/10.5194/gmd-14-5125-2021 8 %X In the last decade, the Climate Limited-area Modeling Community (CLM-Community) has contributed to the Coordinated Regional Climate Downscaling Experiment (CORDEX) with an extensive set of regional climate simulations. Using several versions of the COSMO-CLM-Community model, ERA-Interim reanalysis and eight global climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) were dynamically downscaled with horizontal grid spacings of 0.44∘ (∼ 50 km), 0.22∘ (∼ 25 km), and 0.11∘ (∼ 12 km) over the CORDEX domains Europe, South Asia, East Asia, Australasia, and Africa. This major effort resulted in 80 regional climate simulations publicly available through the Earth System Grid Federation (ESGF) web portals for use in impact studies and climate scenario assessments. Here we review the production of these simulations and assess their results in terms of mean near-surface temperature and precipitation to aid the future design of the COSMO-CLM model simulations. It is found that a domain-specific parameter tuning is beneficial, while increasing horizontal model resolution (from 50 to 25 or 12 km grid spacing) alone does not always improve the performance of the simulation. Moreover, the COSMO-CLM performance depends on the driving data. This is generally more important than the dependence on horizontal resolution, model version, and configuration. Our results emphasize the importance of performing regional climate projections in a coordinated way, where guidance from both the global (GCM) and regional (RCM) climate modeling communities is needed to increase the reliability of the GCM–RCM modeling chain. %0 journal article %@ 0025-3227 %A Wilckens, H.,Miramontes, E.,Schwenk, T.,Artana, C.,Zhang, W.,Piola, A.,Baqueseg, M.,Provost, C.,Hernández-Molina, J.,Felgendreher, M.,Spieß, V.,Kasten, S. %D 2021 %J Marine Geology %N %P 106539 %R doi:10.1016/j.margeo.2021.106539 %T The erosive power of the Malvinas Current: Influence of bottom currents on morpho-sedimentary features along the northern Argentine margin (SW Atlantic Ocean) %U https://doi.org/10.1016/j.margeo.2021.106539 %X Sediment deposits formed mainly under the influence of bottom currents (contourites) are widely used as high-resolution archives for reconstructing past ocean conditions. However, the driving processes of Contourite Depositional Systems (CDS) are not entirely understood. The aim of this study is to establish a clearer link between contourite features and the oceanographic processes that form them. The morphosedimentary characteristics of a large CDS were analysed together with the current dynamics along the northern Argentine continental margin. This study combines multibeam bathymetry, seismo-acoustic data, sediment samples, vessel-mounted Acoustic Doppler Current Profiler (VM-ADCP) data and numerical modelling of ocean currents.,The contouritic features include large contourite terraces (La Plata Terrace, Ewing Terrace) and an abraded surface connecting the terraces, as well as smaller erosional and depositional features like moats, erosion surfaces on the Ewing Terrace, sediment waves and contourite drifts. Measured and modelled near-bottom currents are vigorous (up to 63 cm/s at 150–200 m above the seafloor) where abraded surfaces and moats are present, and relatively weak (below 30 cm/s) on the La Plata Terrace and the Ewing Terrace. Generally, bottom currents follow the upper and middle slope morphology. Decreasing velocity of water masses flowing northward leads to less erosion and finer sediment deposits. ADCP data and the hydrodynamic model show the formation of eddies near the seafloor which probably lead to the small erosion surfaces on the Ewing Terrace, even though it is mainly a depositional environment. Overall, this study contributes to a better understanding of the formation of CDS and can help future reconstructions of past ocean conditions based on sedimentary structures. %0 journal article %@ 2071-1050 %A Przedrzymirska, J.,Zaucha, J.,Calado, H.,Lukic, I.,Bocci, M.,Ramieri, E.,Varona, M.C.,Barbanti, A.,Depellegrin, D.,De Sousa Vergílio, M.,Schultz-Zehden, A.,Onyango, V.,Papaioannou, E.,Buck, B.H.,Krause, G.,Felix Schupp, M.,Läkamp, R.,Szefler, K.,Michałek, M.,Maniopoulou, M.,Vassilopoulou, V.,Kyriazi, Z.,Gawlikowska-Hueckel, K.,Szultka, S.,Orobello, C.,Gee, K.,Buchanan, B.,Lazić, M. %D 2021 %J Sustainability %N 15 %P 8159 %R doi:10.3390/su13158159 %T Multi-Use of the Sea as a Sustainable Development Instrument in Five EU Sea Basins %U https://doi.org/10.3390/su13158159 15 %X This paper examines the concept of maritime multi-use as a territorial/SPATIAL governance instrument for the enhancement of sustainable development in five EU sea basins. Multi-use (MU) is expected to enhance the productivity of blue economy sectors, as well as deliver additional socio-economic benefits related to the environmental and social dimensions of sustainable development. The paper provides a definition of maritime multi-use and identifies the multi-uses with the highest potential in EU sea basins. In each sea basin, multi-use plays a different role as concerns sustainable development. For the Eastern Baltic Sea, the Mediterranean Sea and the Black Sea, the MU focus should remain on the environmental pillar of sustainable development. In the North Sea, North Atlantic and Western Baltic Sea, addressing social sustainability seems a key precondition for success of MU in enhancement of sustainable spatial development at sea. Moreover, it has been suggested to introduce MU key global strategies such as SDGs or Macroregional strategies and action plans and to supplement maritime spatial planning with sectoral incentives and educational efforts as key vehicles supporting MU. The paper concludes by identifying aspects which, in order to inform maritime spatial planning and maritime governance regarding a more conscious application of the aforementioned concept, require further investigation. Key tasks are related to: more profound evaluation of performance of policies supporting MUs, researching the impact of MU on societal goals and on the MU costs and benefits, including external ones, and finally identifying the impact of MU on the development of various sectors and regions on land. %0 journal article %@ 2213-9567 %A Millán-Ramos, B.,Morquecho-Marín, D.,Silva-Bermudez, P.,Ramírez-Ortega, D.,Depablos-Rivera, O.,García-López, J.,Fernández-Lizárraga, M.,Victoria-Hernández, J.,Letzig, D.,Almaguer-Flores, A.,Rodil, S.E. %D 2021 %J Journal of Magnesium and Alloys %N 6 %P 2019-2038 %R doi:10.1016/j.jma.2021.07.010 %T Biocompatibility and electrochemical evaluation of ZrO2 thin films deposited by reactive magnetron sputtering on MgZnCa alloy %U https://doi.org/10.1016/j.jma.2021.07.010 6 %X Biodegradable magnesium alloys are promising candidates for temporary fracture fixation devices in orthopedics; nevertheless, its fast degradation rate at the initial stage after implantation remains as one of the main challenges to be resolved. ZrO2-based coatings to reduce the degradation rate of the Mg-implants are an attractive solution since they show high biocompatibility and stability. In this work, the degradation, cytotoxicity, and antibacterial performance of ZrO2 thin films deposited by magnetron sputtering on a Mg-Zn-Ca alloy was evaluated. Short-term degradation of ZrO2-coated and uncoated samples was assessed considering electrochemical techniques and H2 evolution (gas chromatography). Additionally, long term degradation was assessed by mass-loss measurements. The results showed that a 380 nm ZrO2 coating reduces the degradation rate and H2 evolution of the alloy during the initial 3 days after immersion but allows the degradation of the bare alloy for the long-term. The ZrO2 coating does not compromise the biocompatibility of the alloy and permits better cell adhesion and proliferation of mesenchymal stem cells directly on its surface, in comparison to the bare alloy. Finally, the ZrO2 coating prevents the adhesion and biofilm formation of S. aureus. %0 journal article %@ 2405-8807 %A Williams, D.,Máñez Costa, M.,Kovalevsky, D.,van den Hurk, B.,Klein, B.,Meissner, D.,Pulido-Velazquez, M.,Andreu, J.,Suarez-Alminana, S. %D 2020 %J Climate Services %N %P 100180 %R doi:10.1016/j.cliser.2020.100180 %T A method of assessing user capacities for effective climate services %U https://doi.org/10.1016/j.cliser.2020.100180 %X Translating and incorporating climate information into decision-making and policy planning processes is challenging. In tailoring climate data to sector-specific user needs, climate services are seen as key mechanisms for facilitating this translation and incorporation, supporting climate change adaptation and sustainable development. The European water sector is especially in need of tailored climate data for informing climate-smart action and reducing human and economic impacts of climate change. This was the objective of the EU Horizon 2020 Project IMPREX (IMproving PRedictions and management of hydrological EXtremes). The paper shows how pre-identified shortcomings were addressed in the design of climate services in IMPREX, and how this process elucidated new research priorities for improving the effectiveness of climate services. The paper finds the use of participatory methods helped identify stakeholder needs, and advocates for the greater consideration of user and institutional capacity for integrating climate services into decision-making and policy planning processes. %0 journal article %@ 0894-8755 %A Spinoni, J.,Barbosa, P.,Bucchignani, E.,Cassano, J.,Cavazos, T.,Christensen, J.,Christensen, O.,Coppola, E.,Evans, J.,Geyer, B.,Giorgi, F.,Hadjinicolaou, P.,Jacob, D.,Katzfey, J.,Koenigk, T.,Laprise, R.,Lennard, C.,Kurnatz, L.,Li, D.,Llopart, M.,McCormick, N.,Naumann, G.,Nikulin, G.,Ozturk, T.,Panitz, H.,da Rocha, R.P.,Rockel, B.,Solman, S.,Syktus, J.,Tangang, F.,Teichmann, C.,Vautard, R.,Vogt, J.,Winger, K.,Zittis, G.,Dosio, A. %D 2020 %J Journal of Climate %N 9 %P 3635-3661 %R doi:10.1175/JCLI-D-19-0084.1 %T Future Global Meteorological Drought Hot Spots: A Study Based on CORDEX Data %U https://doi.org/10.1175/JCLI-D-19-0084.1 9 %X Two questions motivated this study: 1) Will meteorological droughts become more frequent and severe during the twenty-first century? 2) Given the projected global temperature rise, to what extent does the inclusion of temperature (in addition to precipitation) in drought indicators play a role in future meteorological droughts? To answer, we analyzed the changes in drought frequency, severity, and historically undocumented extreme droughts over 1981–2100, using the standardized precipitation index (SPI; including precipitation only) and standardized precipitation-evapotranspiration index (SPEI; indirectly including temperature), and under two representative concentration pathways (RCP4.5 and RCP8.5). As input data, we employed 103 high-resolution (0.44°) simulations from the Coordinated Regional Climate Downscaling Experiment (CORDEX), based on a combination of 16 global circulation models (GCMs) and 20 regional circulation models (RCMs). This is the first study on global drought projections including RCMs based on such a large ensemble of RCMs. Based on precipitation only, ~15% of the global land is likely to experience more frequent and severe droughts during 2071–2100 versus 1981–2010 for both scenarios. This increase is larger (~47% under RCP4.5, ~49% under RCP8.5) when precipitation and temperature are used. Both SPI and SPEI project more frequent and severe droughts, especially under RCP8.5, over southern South America, the Mediterranean region, southern Africa, southeastern China, Japan, and southern Australia. A decrease in drought is projected for high latitudes in Northern Hemisphere and Southeast Asia. If temperature is included, drought characteristics are projected to increase over North America, Amazonia, central Europe and Asia, the Horn of Africa, India, and central Australia; if only precipitation is considered, they are found to decrease over those areas. %0 journal article %@ 0168-9002 %A Andersen, K.H.,Argyriou, D.N.,Jackson, A.J.,Houston, J.,Henry, P.F.,Deen, P.P.,Toft-Petersen, R.,Beran, P.,Strobl, M.,Arnold, T.,Wacklin-Knecht, H.,Tsapatsaris, N.,Oksanen, E.,Woracek, R.,Schweika, W.,Mannix, D.,Hiess, A.,Kennedy, S.,Kirstein, O.,Petersson Årsköld, S.,Taylor, J.,Hagen, M.E.,Laszlo, G.,Kanaki, K.,Piscitelli, F.,Khaplanov, A.,Stefanescu, I.,Kittelmann, T.,Pfeiffer, D.,Hall-Wilton, R.,Lopez, C.I.,Aprigliano, G.,Whitelegg, L.,Moreira, F.Y.,Olsson, M.,Bordallo, H.N.,Martín-Rodríguez, D.,Schneider, H.,Sharp, M.,Hartl, M.,Nagy, G.,Ansell, S.,Pullen, S.,Vickery, A.,Fedrigo, A.,Mezei, F.,Arai, M.,Heenan, R.K.,Halcrow, W.,Turner, D.,Raspino, D.,Orszulik, A.,Cooper, J.,Webb, N.,Galsworthy, P.,Nightingale, J.,Langridge, S.,Elmer, J.,Frielinghaus, H.,Hanslik, R.,Gussen, A.,Jaksch, S.,Engels, R.,Kozielewski, T.,Butterweck, S.,Feygenson, M.,Harbott, P.,Poqué, A.,Schwaab, A.,Lieutenant, K.,Violini, N.,Voigt, J.,Brückel, T.,Koenen, M.,Kämmerling, H.,Babcock, E.,Salhi, Z.,Wischnewski, A.,Heynen, A.,Désert, S.,Jestin, J.,Porcher, F.,Fabrèges, X.,Fabrèges, G.,Annighöfer, B.,Klimko, S.,Dupont, T.,Robillard, T.,Goukassov, A.,Longeville, S.,Alba-Simionesco, C.,Bourges, P.,Guyon Le Bouffy, J.,Lavie, P.,Rodrigues, S.,Calzada, E.,Lerche, M.,Schillinger, B.,Schmakat, P.,Schulz, M.,Seifert, M.,Lohstroh, W.,Petry, W.,Neuhaus, J.,Loaiza, L.,Tartaglione, A.,Glavic, A.,Schütz, S.,Stahn, J.,Lehmann, E.,Morgano, M.,Schefer, J.,Filges, U.,Klauser, C.,Niedermayer, C.,Fenske, J.,Nowak,G.,Rouijaa, M.,Siemers, D.J.,Kiehn, R.,Müller, M.,Carlsen, H.,Udby, L.,Lefmann, K.,Birk, J.O.,Holm-Dahlin, S.,Bertelsen, M.,Hansen, U.B.,Olsen, M.A.,Christensen, M.,Iversen, K.,Christensen, N.B.,Rønnow, H.M.,Freeman, P.G.,Hauback, B.C.,Kolevatov, R.,Llamas-Jansa, I.,Orecchini, A.,Sacchetti, F.,Petrillo, C.,Paciaroni, A.,Tozzi, P.,Zanatta, M.,Luna, P.,Herranz, I.,del Moral, O.G.,Huerta, M.,Magán, M.,Mosconi, M.,Abad, E.,Aguilar, J.,Stepanyan, S.,Bakedano, G.,Vivanco, R.,Bustinduy, I.,Sordo, F.,Martínez, J.L.,Lechner, R.E.,Villacorta, F.J.,Šaroun, J.,Lukáš, P.,Markó, M.,Zanetti, M.,Bellissima, S.,del Rosso, L.,Masi, F.,Bovo, C.,Chowdhury, M.,De Bonis, A.,DiFresco, L.,Scatigno, C.,Parker, S.F.,Fernandez-Alonso, F.,Colognesi, D.,Senesi, R.,Andreani, C.,Gorini, G.,Scionti, G.,Schreyer, A. %D 2020 %J Nuclear Instruments and Methods in Physics Research A %N %P 163402 %R doi:10.1016/j.nima.2020.163402 %T The instrument suite of the European Spallation Source %U https://doi.org/10.1016/j.nima.2020.163402 %X An overview is provided of the 15 neutron beam instruments making up the initial instrument suite of the European Spallation Source (ESS), and being made available to the neutron user community. The ESS neutron source consists of a high-power accelerator and target station, providing a unique long-pulse time structure of slow neutrons. The design considerations behind the time structure, moderator geometry and instrument layout are presented.,The 15-instrument suite consists of two small-angle instruments, two reflectometers, an imaging beamline, two single-crystal diffractometers; one for macromolecular crystallography and one for magnetism, two powder diffractometers, and an engineering diffractometer, as well as an array of five inelastic instruments comprising two chopper spectrometers, an inverse-geometry single-crystal excitations spectrometer, an instrument for vibrational spectroscopy and a high-resolution backscattering spectrometer. The conceptual design, performance and scientific drivers of each of these instruments are described.,All of the instruments are designed to provide breakthrough new scientific capability, not currently available at existing facilities, building on the inherent strengths of the ESS long-pulse neutron source of high flux, flexible resolution and large bandwidth. Each of them is predicted to provide world-leading performance at an accelerator power of 2 MW. This technical capability translates into a very broad range of scientific capabilities. The composition of the instrument suite has been chosen to maximise the breadth and depth of the scientific impact of the early years of the ESS, and provide a solid base for completion and further expansion of the facility. %0 journal article %@ 1436-3798 %A Jacob, D.,Teichmann, C.,Sobolowski, S.,Katragkou, E.,Anders, I.,Belda, M.,Benestad, R.,Boberg, F.,Buonomo, E.,Cardoso, R.M.,Casanueva, A.,Christensen, O.B.,Christensen, J.H.,Coppola, E.,De Cruz, L.,Davin, E.L.,Dobler, A.,Domínguez, M.,Fealy, R.,Fernandez, J.,Gaertner, M.A.,García-Díez, M.,Giorgi, F.,Gobiet, A.,Goergen, K.,Gómez-Navarro, J.J.,Alemán, J.J.G.,Gutiérrez, C.,Gutiérrez, J.M.,Güttler, I.,Haensler, A.,Halenka, T.,Jerez, S.,Jiménez-Guerrero, P.,Jones, R.G.,Keuler, K.,Kjellström, E.,Knist, S.,Kotlarski, S.,Maraun, D.,van Meijgaard, E.,Mercogliano, P.,Montávez, J.P.,Navarra, A.,Nikulin, G.,de Noblet-Ducoudré, N.,Panitz, H.-J.,Pfeifer, S.,Piazza, M.,Pichelli, E.,Pietikäinen, J.-P.,Prein, A.F.,Preuschmann, S.,Rechid, D.,Rockel, B.,Romera, R.,Sánchez, E.,Sieck, K.,Soares, P.M.M.,Somot, S.,Srnec, L.,Sørland, S.L.,Termonia, P.,Truhetz, H.,Vautard, R.,Warrach-Sagi, K.,Wulfmeyer, V. %D 2020 %J Regional Environmental Change %N 2 %P 51 %R doi:10.1007/s10113-020-01606-9 %T Regional climate downscaling over Europe: perspectives from the EURO-CORDEX community %U https://doi.org/10.1007/s10113-020-01606-9 2 %X The European CORDEX (EURO-CORDEX) initiative is a large voluntary effort that seeks to advance regional climate and Earth system science in Europe. As part of the World Climate Research Programme (WCRP) - Coordinated Regional Downscaling Experiment (CORDEX), it shares the broader goals of providing a model evaluation and climate projection framework and improving communication with both the General Circulation Model (GCM) and climate data user communities. EURO-CORDEX oversees the design and coordination of ongoing ensembles of regional climate projections of unprecedented size and resolution (0.11° EUR-11 and 0.44° EUR-44 domains). Additionally, the inclusion of empirical-statistical downscaling allows investigation of much larger multi-model ensembles. These complementary approaches provide a foundation for scientific studies within the climate research community and others. The value of the EURO-CORDEX ensemble is shown via numerous peer-reviewed studies and its use in the development of climate services. Evaluations of the EUR-44 and EUR-11 ensembles also show the benefits of higher resolution. However, significant challenges remain. To further advance scientific understanding, two flagship pilot studies (FPS) were initiated. The first investigates local-regional phenomena at convection-permitting scales over central Europe and the Mediterranean in collaboration with the Med-CORDEX community. The second investigates the impacts of land cover changes on European climate across spatial and temporal scales. Over the coming years, the EURO-CORDEX community looks forward to closer collaboration with other communities, new advances, supporting international initiatives such as the IPCC reports, and continuing to provide the basis for research on regional climate impacts and adaptation in Europe. %0 conference paper %@ 2367-1696 %A Nienaber, M.,Bohlen, J.,Victoria-Hernández, J.,Yi, S.,Kainer, K.,Letzig, D. %D 2020 %J Magnesium Technology 2020 %N %P 329-334 %R doi:10.1007/978-3-030-36647-6_49 %T Cold Formability of Extruded Magnesium Bands %U https://doi.org/10.1007/978-3-030-36647-6_49 %X Three magnesium alloys with texture and microstructure modifying elements, binary M2, and the alloyed counterparts with Ca (MX21) and rare earth element (ME21) were extruded to flat bands under similar conditions. The microstructure and texture in extrusion significantly differ from those developed in rolled magnesium sheets. The influence on the mechanical properties and the forming behaviour, in terms of Erichsen values, with relation to microstructure, texture, and strain rate sensitivity was examined. A clear difference in texture development and strain rate sensitivity is shown in dependence on the alloying composition. In addition, not only the texture, but also the microstructure has a great influence on formability. %0 journal article %@ 2296-7745 %A Capet, A.,Fernández, V.,She, J.,Dabrowski, T.,Umgiesser, G.,Staneva, J.,Mészáros, L.,Campuzano, F.,Ursella, L.,Nolan, G.,El Serafy, G. %D 2020 %J Frontiers in Marine Science %N %P 129 %R doi:10.3389/fmars.2020.00129 %T Operational Modeling Capacity in European Seas—An EuroGOOS Perspective and Recommendations for Improvement %U https://doi.org/10.3389/fmars.2020.00129 %X An overview of the current European capacity in terms of operational modeling of marine and coastal systems is presented. This overview is compiled from a survey conducted in 2018–2019 among members of EuroGOOS and its related network of Regional Operational Oceanographic Systems, addressing the purposes, context and technical specificities of operational modeling systems. Contributions to the survey were received from 49 organizations around Europe, which represent 104 operational model systems simulating mostly hydrodynamics, biogeochemistry and sea waves. The analysis of contributions highlights the strengths and weaknesses of the current capacity from an operational point of view, and leads to the formulation of recommendations toward the improvement of marine operational modeling services in Europe. In particular, this study highlights the heterogeneity of the European operational modeling capacity in terms of atmospheric and land boundary conditions, its limited deployment for biogeochemical phenomena, and a restricted use of data assimilation methods. In order to improve the accuracy of their simulations, model operators aim toward a further refinement of spatial resolution, and identify the quality and accessibility of forcing data and the suitability of observations for data assimilation as restricting factors. The described issues call for institutional integration efforts and promotion of good practices to homogenize operational marine model implementations, and to ensure that external forcing datasets, observation networks and process formulations and parameterizations are adequately developed to enable the deployment of high-level operational marine and coastal modeling services across Europe. %0 journal article %@ 0924-0136 %A Inácio, P.,Camacho, E.,Schell, N.,Braz Fernandes, F.,Oliveira, J.,Santos, T. %D 2020 %J Journal of Materials Processing Technology %N %P 116803 %R doi:10.1016/j.jmatprotec.2020.116803 %T Production and characterization of functionally graded NiTi shape memory alloys by Joule effect %U https://doi.org/10.1016/j.jmatprotec.2020.116803 %X Localized heat treatments via Joule effect were performed on cold-drawn NiTi strips to produce a functionally graded material (FGM). Three zones where locally heat treated at 300, 350, and 400 °C for 10 min followed by air cooling. Multiscale and multiphenomena characterization of the obtained FGM was performed through infrared temperature testing, four-point probe and eddy current testing, mechanical testing and synchrotron X-ray diffraction. The effect of these localized heat treatments is clearly observed by different techniques. The use of these short and localized heat treatments avoids the need of highly expensive manufacturing routes typically used to obtain the same effect on NiTi shape memory alloys, thus opening new possibilities for processing these advanced engineering alloys. %0 journal article %@ 0921-5093 %A Cano-Castillo, G.,Victoria-Hernández, J.,Bohlen, J.,Letzig, D.,Kainer, K. %D 2020 %J Materials Science and Engineering A %N %P 139527 %R doi:/10.1016/j.msea.2020.139527 %T Effect of Ca and Nd on the microstructural development during dynamic and static recrystallization of indirectly extruded Mg–Zn based alloys %U https://doi.org//10.1016/j.msea.2020.139527 %X The present study examines the influence of Ca or Nd on the microstructure and texture modification during indirect extrusion and after subsequent annealing of Mg–Zn based alloys. The addition of such elements influence the recrystallization processes, i.e. dynamic (DRX) and static recrystallization (SRX), and leads to distinctive texture changes of samples extruded at different extrusion speeds. In the binary Mg–Zn alloys, the resulting texture after extrusion is the classical basal type texture, where there is an alignment of basal planes along the arc between the <10–10〉> and <11–20> poles. This development is independent of the extrusion speed, as the resulting microstructures are almost completely recrystallized. In the case of the Mg–Zn–Ca, there is a distinctive <10–11> component together with a <11–20> pole, while in the Mg–Zn-Nd alloy the so-called <11–21> rare-earth texture component and the <20–23> pole intensity are observed as DRX dominates the microstructural development. It is found that this distinctive behavior can be changed if partially recrystallized microstructures are subsequently annealed. This leads to an increase of the importance of SRX and a different resulting texture while maintaining a similar grain structure. Both recrystallization processes lead to different mechanical properties, yielding behavior and toughness as a result of the different texture development. %0 journal article %@ 2079-6412 %A Ahiwar, H.,Zhou, Y.,Mahapatra, C.,Ramakrishna, S.,Kumar, P.,Nanda, H. %D 2020 %J Coatings %N 3 %P 264 %R doi:10.3390/coatings10030264 %T Materials for Orthopedic Bioimplants: Modulating Degradation and Surface Modification Using Integrated Nanomaterials %U https://doi.org/10.3390/coatings10030264 3 %X Significant research and development in the field of biomedical implants has evoked the scope to treat a broad range of orthopedic ailments that include fracture fixation, total bone replacement, joint arthrodesis, dental screws, and others. Importantly, the success of a bioimplant depends not only upon its bulk properties, but also on its surface properties that influence its interaction with the host tissue. Various approaches of surface modification such as coating of nanomaterial have been employed to enhance antibacterial activities of a bioimplant. The modified surface facilitates directed modulation of the host cellular behavior and grafting of cell-binding peptides, extracellular matrix (ECM) proteins, and growth factors to further improve host acceptance of a bioimplant. These strategies showed promising results in orthopedics, e.g., improved bone repair and regeneration. However, the choice of materials, especially considering their degradation behavior and surface properties, plays a key role in long-term reliability and performance of bioimplants. Metallic biomaterials have evolved largely in terms of their bulk and surface properties including nano-structuring with nanomaterials to meet the requirements of new generation orthopedic bioimplants. In this review, we have discussed metals and metal alloys commonly used for manufacturing different orthopedic bioimplants and the biotic as well as abiotic factors affecting the failure and degradation of those bioimplants. The review also highlights the currently available nanomaterial-based surface modification technologies to augment the function and performance of these metallic bioimplants in a clinical setting. %0 journal article %@ 1462-2912 %A Tarazona, N.,Hernández-Arriaga, A.,Kniewel, R.,Prieto, M. %D 2020 %J Environmental Microbiology %N 8 %P 3922-3936 %R doi:10.1111/1462-2920.15175 %T Phasin interactome reveals the interplay of PhaF with the polyhydroxyalkanoate transcriptional regulatory protein PhaD in Pseudomonas putida %U https://doi.org/10.1111/1462-2920.15175 8 %X Phasin PhaF, a multifunctional protein associated with the surface of polyhydroxyalkanoate (PHA) granules that also interacts with the nucleoid, contributes significantly to PHA biogenesis in pseudomonads. As a protein present on the surface of PHA granules, PhaF participates in granule stabilization and segregation, whereas its deletion has a notable impact on overall transcriptome, PHA accumulation and cell physiology, suggesting more extensive functions besides solely being a granule structural protein. Here, we followed a systematic approach to detect potential interactions of PhaF with other components of the cell, which could pinpoint unexplored functions of PhaF in the regulation of PHA production. We determined the PhaF interactome in Pseudomonas putida KT2440 via pull‐down‐mass spectrometry (PD‐MS) experiments. PhaF complexed with PHA‐related proteins, phasin PhaI and the transcriptional regulator PhaD, interactions that were verified to be direct using in vivo two‐hybrid analysis. The determination of the PHA granule proteome showed that PhaI and three other potential PhaF interacting partners, but not PhaD, were granule‐associated proteins. Analysis of the interaction of PhaF and PhaD with the phaI promoter by EMSA suggested a new role for PhaF in interacting with PhaD and raises new questions on the regulatory system controlling pha gene expression. %0 conference lecture %@ %A Millan, B.,Victoria-Hernandez, J.,Kurz, G.,Letzig, D.,Rodil, S. %D 2020 %J Updates in Bioabsorbable Metals 2020 %N %P %T Electrochemical evaluation of TiO2 coatings deposited on biodegradable MgZnCa alloy %U %X %0 journal article %@ 0167-577X %A Morquecho-Marin, D.,Silva-Bermudez, P.,Millan-Ramos, B.,Victoria-Hernandez, J.,Letzig, D.,Ramirez-Ortega, D.,Depablos-Rivera, O.,Garcia-Lopez, J.,Barrera-Ortega, C.,Rodil, S. %D 2020 %J Materials Letters %N %P 128236 %R doi:10.1016/j.matlet.2020.128236 %T Unexpected cytotoxicity of TiO2-coated magnesium alloys %U https://doi.org/10.1016/j.matlet.2020.128236 %X Biodegradable Mg-based alloys have attracted increasing attention from orthopedic surgeons and biomaterials scientists since their Young’s modulus is close to that of bone. However, control of the degradation rate is still a challenge. Sputtered TiO2 coatings were deposited on Mg-Zn-Ca alloys aiming to reduce the initial strong reactivity of Mg with biological fluids. However, the degradation tests indicated that the coated samples induced a larger variation in the pH, greater H2 production and formation of degradation products in comparison to the bare alloys. Consequently, an enhanced cytotoxicity of the coated samples was observed. %0 journal article %@ 0264-1275 %A Oliveira, J.,Curado, T.,Zeng, Z.,Lopes, J.,Rossinyol, E.,Park, J.,Schell, N.,Braz Fernandes, J.,Kim, H. %D 2020 %J Materials and Design %N %P 108505 %R doi:10.1016/j.matdes.2020.108505 %T Gas tungsten arc welding of as-rolled CrMnFeCoNi high entropy alloy %U https://doi.org/10.1016/j.matdes.2020.108505 %X High entropy alloys have emerged as novel engineering alloys with remarkable mechanical properties in a wide range of temperatures. Among the several high entropy alloys that were already described, the equiatomic CrMnFeCoNi alloy is the most studied one. In this work, gas tungsten arc welding of as-rolled CrMnFeCoNi high entropy alloy sheets was performed. The microstructural characterization encompassed the use of electron microscopy, including electron backscattered diffraction, synchrotron X-ray diffraction analysis, microhardness testing and mechanical evaluation. A comprehensive description of the microstructural evolution, including texture and microstrain determination, of the joint is presented and discussed. Upon mechanical testing, the joints systematically failed in the fusion zone due. The large grain size and low hardness of this region justifies the failure location. The joints' mechanical behaviour is correlated with the material microstructure. %0 journal article %@ 1751-6161 %A Rodrigues, P.,Fernandes, F.,Magalhaes, R.,Camacho, E.,Lopes, A.,Paula, A.,Basu, R.,Schell, N. %D 2020 %J Journal of the Mechanical Behavior of Biomedical Materials %N %P 103747 %R doi:10.1016/j.jmbbm.2020.103747 %T Thermo-mechanical characterization of NiTi orthodontic archwires with graded actuating forces %U https://doi.org/10.1016/j.jmbbm.2020.103747 %X Functionally graded NiTi orthodontic archwire was tested to assess the evolution of the actuation force as a function of the temperature. Varying actuation forces on the same orthodontic wire allow the optimization of repositioning of the different types of teeth, according its radicular support. The wire was separated into three segments: Incisive, Premolar and Molar. The functionally graded NiTi orthodontic archwire segments have distinct structural and mechanical behavior as confirmed by differential scanning calorimetry, synchrotron-based X-ray diffraction, and thermomechanical analysis. The mechanical behavior was analyzed by three-point bending tests at four different temperatures (5, 20, 25 and 37 °C). In parallel, three-point bending tests were performed by TMA analysis in a temperature range from 5 °C (from cold water) to 40 °C (hot meal). This study showed the comparison of the different segments on the same archwire, providing a better understanding of the behavior of these functionally graded materials. %0 journal article %@ 0924-0136 %A Cavaleiro, A.,Ramos, A.,Braz Fernandes, F.,Schell, N.,Viera, M. %D 2020 %J Journal of Materials Processing Technology %N %P 116354 %R doi:10.1016/j.jmatprotec.2019.116354 %T Follow-up structural evolution of Ni/Ti reactive nano and microlayers during diffusion bonding of NiTi to Ti6Al4V in a synchrotron beamline %U https://doi.org/10.1016/j.jmatprotec.2019.116354 %X Reaction-Assisted Diffusion Bonding (RADB) of NiTi to Ti6Al4V using either magnetron sputtered Ni/Ti nanomultilayers or Ni/Ti commercial microfoils as filler material was studied. The joining process takes advantage of the exothermal reactive character of the Ni-Ti system to provide extra energy during the bonding process. Therefore, sound joints could be achieved at lower thermal conditions. The oven with load capabilities at the High Energy Materials Science beamline (P07) of the Deutsch Synchrotron (DESY) is ideal to follow the structural evolution of the materials involved in the bonding process. Prior to RABD, Ni/Ti multilayers with a 2.5 μm total thickness and with 12 or 25 nm of modulation period were deposited onto the materials being joined. In alternative, up to 20 alternated thin μ-foils were placed in between the base materials. The materials were heated by induction to the selected temperature during 30 min and quenched to room temperature by blowing helium. During the thermal cycle a 10 MPa pressure was applied. Using thin μ-foils, 650 °C was required to promote joining, while using multilayer coated materials sound joints were obtained at 600 °C. Such low temperatures are attractive from the application/economic point of view, and are crucial to reduce the formation of undesired intermetallic phases, such as NiTi2. The nanoindentation experiments of the joints processed using Ni/Ti nanomultilayers confirm that the presence of the NiTi2 phase is more pronounced at 650 °C than when the joints are processed at 600 °C. %0 journal article %@ 0930-7575 %A Coppola, E.,Sobolowski, S.,Pichelli, E.,Raffaele, F.,Ahrens, B.,Anders, I.,Ban, N.,Bastin, S.,Belda, M.,Belusic, D.,Caldas-Alvarez, A.,Cardoso, R.M.,Davolio, S.,Dobler, A.,Fernandez, J.,Fita, L.,Fumiere, Q.,Giorgi, F.,Goergen, K.,Guettler, I.,Halenka, T.,Heinzeller, D.,Hodnebrog, Oe.,Jacob, D.,Kartsios, S.,Katragkou, E.,Kendon, E.,Khodayar, S.,Kunstmann, H.,Knist, S.,Lavin-Gullon, A.,Lind, P.,Lorenz, T.,Maraun, D.,Marelle, L.,Meijgaard, E.van,Milovac, J.,Myhre, G.,Panitz, H.-J.,Piazza, M.,Raffa, M.,Raub, T.,Rockel, B.,Schaer, C.,Sieck, K.,Soares, P.M.M.,Somot, S.,Srnec, L.,Stocchi, P.,Toelle, M.H.,Truhetz, H.,Vautard, R.,de Vries, H.,Warrach-Sagi, K. %D 2020 %J Climate Dynamics %N %P 3-34 %R doi:10.1007/s00382-018-4521-8 %T A first-of-its-kind multi-model convection permitting ensemble for investigating convective phenomena over Europe and the Mediterranean %U https://doi.org/10.1007/s00382-018-4521-8 %X A recently launched project under the auspices of the World Climate Research Program’s (WCRP) Coordinated Regional Downscaling Experiments Flagship Pilot Studies program (CORDEX-FPS) is presented. This initiative aims to build first-of-its-kind ensemble climate experiments of convection permitting models to investigate present and future convective processes and related extremes over Europe and the Mediterranean. In this manuscript the rationale, scientific aims and approaches are presented along with some preliminary results from the testing phase of the project. Three test cases were selected in order to obtain a first look at the ensemble performance. The test cases covered a summertime extreme precipitation event over Austria, a fall Foehn event over the Swiss Alps and an intensively documented fall event along the Mediterranean coast. The test cases were run in both “weather-like” (WL, initialized just before the event in question) and “climate” (CM, initialized 1 month before the event) modes. Ensembles of 18–21 members, representing six different modeling systems with different physics and modelling chain options, was generated for the test cases (27 modeling teams have committed to perform the longer climate simulations). Results indicate that, when run in WL mode, the ensemble captures all three events quite well with ensemble correlation skill scores of 0.67, 0.82 and 0.91. They suggest that the more the event is driven by large-scale conditions, the closer the agreement between the ensemble members. Even in climate mode the large-scale driven events over the Swiss Alps and the Mediterranean coasts are still captured (ensemble correlation skill scores of 0.90 and 0.62, respectively), but the inter-model spread increases as expected. In the case over Mediterranean the effects of local-scale interactions between flow and orography and land–ocean contrasts are readily apparent. However, there is a much larger, though not surprising, increase in the spread for the Austrian event, which was weakly forced by the large-scale flow. Though the ensemble correlation skill score is still quite high (0.80). The preliminary results illustrate both the promise and the challenges that convection permitting modeling faces and make a strong argument for an ensemble-based approach to investigating high impact convective processes. %0 journal article %@ 2468-4511 %A Zhou, Y.,Mahapatra, C.,Chen, H.,Peng, X.,Ramakrishna, S.,Nanda, H. %D 2020 %J Current Opinion in Biomedical Engineering %N %P 16-24 %R doi:10.1016/j.cobme.2019.08.003 %T Recent developments in fluorescent aptasensors for detection of antibiotics %U https://doi.org/10.1016/j.cobme.2019.08.003 %X Antibiotic abuse is considered as a serious problem affecting human health, demanding great attention to explore robust, accurate, real-time, on-site, and sensitive methods for rapid evaluation (detection and quantification) of food and biological samples such as serum. To address this challenging problem, biosensors have been developed as a valuable and sensitive tool to detect and quantify the amount of antibiotics. Among various kinds of biosensors, recently, aptamer-based biosensors (aptasensors) based on the fluorescent strategy have evolved as an excellent candidate for rapid evaluation of antibiotics, owing to their superior selectivity, specificity, and sensitivity. This review encompasses an overview of various kinds of recently developed fluorescent aptasensors for antibiotic detection and gives an idea of important sensing mechanisms associated with the developed aptasensors. The current review focuses on aims to further encourage and inspire targeted readers to develop new approaches for fabricating more practical and mature fluorescent aptasensors for antibiotic detection in the future. %0 conference lecture %@ %A Campuzano, F.,Santos, F.,Ramos de Oliveira, A.,Simionesei, L.,Fernandes, R.,Brito, D.,Olmedo, E.,Turiel, A.,Alba, M.,Novellino, A.,Tonani, M.,Lewis, H.,Sotillo, M.,Baladrón, A.,Dabrowski, T.,Jacob, B.,Staneva, J.,Newes, R. %D 2020 %J EGU General Assembly 2020 %N %P %R doi:10.5194/egusphere-egu2020-17977 %T Framework for improving land boundary conditions in regional ocean products %U https://doi.org/10.5194/egusphere-egu2020-17977 %X Currently hydrological models are not generally coupled to coastal and regional ocean models because, even if regarded as a powerful and useful tool, they do not fully accomplish to estimate accurately the right volume of water reaching the coastal zone for many reasons including water management activities such as human consumption, irrigation, etc. For this reason, many coastal and ocean models continue to use river climatologies as boundary conditions for representing such an active boundary. Furthermore, continuous salinity observations in the coastal area are scarce and sensors are highly unreliable while current Earth Observation (EO) products for salinity poorly represents the coastal gradients.,In this presentation, the current state-of-the-art and the results of the LAMBDA Project (λ) (LAnd-Marine Boundary Development and Analysis) will be shown. The main aim of the project was to demonstrate an improvement in the thermohaline circulation in coastal areas by a better characterisation of the land-marine boundary conditions, with special regard to the salinity fields. The LAMBDA project analysed the opportunity of improving the land-marine boundary conditions by exploring the capacities of state-of-the-art hydrologic models. In order to achieve those objectives, the project strategy used an integrated approach that went from watershed models to validation in the coastal area by fit-for-purpose EO products, developed by SMOS, and passing through methods and proxies for integrating the freshwater flows into regional mesoscale grids. The watershed and estuarine proxies were modelled using the MOHID Water modelling system (http://www.mohid.com/) an open source model capable of simulating a wide range of processes, i.e. hydrodynamics, transport, water quality, oil spills, in surface water bodies (oceans, coastal areas, estuaries and reservoirs). %0 conference lecture %@ %A Nienaber, M.,Bohlen, J.,Victoria-Hernandez, J.,Letzig, D.,Kainer, K.U. %D 2020 %J 149th Annual Meeting & Exhibition of the Minerals, Metals, and Materials Society, TMS 2020 %N %P %T Cold formability of extruded Magnesium bands %U %X %0 journal article %@ 1991-959X %A Demory, M.-E.,Berthou, S.,Fernández, J.,Sørland, S.L.,Brogli, R.,Roberts, M.J.,Beyerle, U.,Seddon, J.,Haarsma, R.,Schär, C.,Buonomo, E.,Christensen, O.B.,Ciarlo, J.M.,Fealy, R.,Nikulin, G.,Peano, D.,Putrasahan, D.,Roberts, C.D.,Senan, R.,Steger, C.,Teichmann, C.,Vautard, R. %D 2020 %J Geoscientific Model Development %N 11 %P 5485-5506 %R doi:10.5194/gmd-13-5485-2020 %T European daily precipitation according to EURO-CORDEX regional climate models (RCMs) and high-resolution global climate models (GCMs) from the High-Resolution Model Intercomparison Project (HighResMIP) %U https://doi.org/10.5194/gmd-13-5485-2020 11 %X In this study, we evaluate a set of high-resolution (25–50 km horizontal grid spacing) global climate models (GCMs) from the High-Resolution Model Intercomparison Project (HighResMIP), developed as part of the EU-funded PRIMAVERA (Process-based climate simulation: Advances in high resolution modelling and European climate risk assessment) project, and from the EURO-CORDEX (Coordinated Regional Climate Downscaling Experiment) regional climate models (RCMs) (12–50 km horizontal grid spacing) over a European domain. It is the first time that an assessment of regional climate information using ensembles of both GCMs and RCMs at similar horizontal resolutions has been possible. The focus of the evaluation is on the distribution of daily precipitation at a 50 km scale under current climate conditions. Both the GCM and RCM ensembles are evaluated against high-quality gridded observations in terms of spatial resolution and station density. We show that both ensembles outperform GCMs from the 5th Coupled Model Intercomparison Project (CMIP5), which cannot capture the regional-scale precipitation distribution properly because of their coarse resolutions. PRIMAVERA GCMs generally simulate precipitation distributions within the range of EURO-CORDEX RCMs. Both ensembles perform better in summer and autumn in most European regions but tend to overestimate precipitation in winter and spring. PRIMAVERA shows improvements in the latter by reducing moderate-precipitation rate biases over central and western Europe. The spatial distribution of mean precipitation is also improved in PRIMAVERA. Finally, heavy precipitation simulated by PRIMAVERA agrees better with observations in most regions and seasons, while CORDEX overestimates precipitation extremes. However, uncertainty exists in the observations due to a potential undercatch error, especially during heavy-precipitation events.,The analyses also confirm previous findings that, although the spatial representation of precipitation is improved, the effect of increasing resolution from 50 to 12 km horizontal grid spacing in EURO-CORDEX daily precipitation distributions is, in comparison, small in most regions and seasons outside mountainous regions and coastal regions. Our results show that both high-resolution GCMs and CORDEX RCMs provide adequate information to end users at a 50 km scale. %0 journal article %@ 1742-7061 %A Hou, R.,Victoria-Hernandez, J.,Jiang, P.,Willumeit-Roemer, R.,Luthringer-Feyerabend, B.J.C.,Yi, S.,Letzig, D.,Feyerabend, F. %D 2019 %J Acta Biomaterialia %N %P 608-622 %R doi:10.1016/j.actbio.2019.07.053 %T In vitro evaluation of the ZX11 magnesium alloy as potential bone plate: Degradability and mechanical integrity %U https://doi.org/10.1016/j.actbio.2019.07.053 %X Considering the excellent biocompatibility of magnesium (Mg) alloys and their better mechanical properties compared to polymer materials, a wrought MgZnCa alloy with low contents of Zn (0.7 wt%) and Ca (0.6 wt%) (ZX11) was developed by twin roll casting (TRC) technology as potential biodegradable bone plates. The degradability and cell response of the ZX11 alloy were evaluated in vitro, as well as the mechanical integrity according to tensile tests after immersion. The results revealed a slightly higher degradation rate for the rolled ZX11, in comparison to that of the annealed one. It was mainly caused by the deformation twins and residual strain stored in the rolled alloy, which also seemed to promote localized degradation, thereby leading to a relatively fast deterioration in mechanical properties, especially the fracture strain/elongation. In contrast, after the annealing treatment, the alloy showed relatively lower strength, yet a lower degradation rate and quite stable elongation during the initial weeks of immersion were observed. More importantly, the ZX11 alloy, regardless of the annealing treatment, showed good in vitro cytocomopatibility regarding human primary osteoblasts. The assessment indicates the rolled alloy as a good choice for implantation sites where relatively high mechanical strength is needed during the early implantation, while the annealed alloy is a potential candidate for the sites which demand stable mechanical integrity during service. %0 journal article %@ 1759-9954 %A Cook, A.B.,Peltier, R.,Zhang, J.,Gurnani, P.,Tanaka, J.,Burns, J.A.,Dallmann, R.,Hartlieb, M.,Perrier, S. %D 2019 %J Polymer Chemistry %N 10 %P 1202-1212 %R doi:10.1039/c8py01648h %T Hyperbranched poly(ethylenimine-co-oxazoline) by thiol–yne chemistry for non-viral gene delivery: investigating the role of polymer architecture %U https://doi.org/10.1039/c8py01648h 10 %X Cationic polymers have been widely employed as gene delivery vectors to help circumvent extracellular and intracellular delivery barriers. Among them, polyethylenimine (PEI) is the most commonly used despite its associated high cytotoxicity. PEI is typically obtained by uncontrolled ring opening polymerisation of aziridine, leading to either linear polymer architectures with only secondary amines, or branched architectures containing primary, secondary, and tertiary amines. In contrast, we describe the preparation of hyperbranched poly(ethylenimine-co-oxazoline) that contains only secondary amines, via a fast thiol–yne based one pot reaction. A small library of these compounds with varying PEI contents was then used to study the effect of polymer architecture on pDNA polyplex formation, cytotoxicity, and in vitro transfection studies with plasmid DNA. Hyperbranched poly(ethylenimine-co-oxazoline) was found to have reduced toxicity compared to the commercial standard 25 000 g mol−1 branched PEI (bPEI), with transfection efficiencies only slightly lower than its bPEI counterpart. Obtained results highlight the importance of the polymer architecture on the transfection efficiency of a gene delivery system, which was demonstrated by excluding other parameters such as molecular weight and charge density. %0 book part %@ %A Yi, S.,Victoria-Hernandez, J.,Kim, Y.M.,Letzig, D.,You, B.S. %D 2019 %J Material and Process Design for Lightweight Structures %N %P 69-77 %R doi:10.3390/books978-3-03897-959-3 %T Modification of Microstructure and Texture in Highly Non-Flammable Mg-Al-Zn-Y-Ca AlloySheets by Controlled Thermomechanical Processes %U https://doi.org/10.3390/books978-3-03897-959-3 %X The influence of rolling temperature and pass reduction degree on microstructure and texture evolution was investigated using an AZXW3100 alloy, Mg-3Al-1Zn-0.5Ca-0.5Y, in wt.%. The,change in the rolling schedule had a significant influence on the resulting texture and microstructure,from the rolling and subsequent annealing. A relatively strong basal-type texture with a basal pole,split into the rolling direction was formed by rolling at 450 ◦C with a decreasing scheme of the pass,reduction degrees with a rolling step, while the tilted basal poles in the transverse direction were,developed by using an increasing scheme of the pass reduction degrees. Rolling at 500 ◦C results in a,further distinct texture type with a far more largely tilted basal pole into the rolling direction. The directional anisotropy of the mechanical properties in the annealed sheets was caused by the texture and microstructural features, which were in turn influenced by the rolling condition. The Erichsen,index of the sheets varied in accordance to the texture sharpness, i.e., the weaker the texture the,higher the formability. The sheet with a tetrarchy distribution of the basal poles into the transverse,and rolling directions shows an excellent formability with an average Erichsen index of 8.1. %0 journal article %@ 0921-5093 %A Victoria-Hernandez, J.,Yi, S.,Klaumuenzer, D.,Letzig, D. %D 2019 %J Materials Science and Engineering A %N %P 138054 %R doi:10.1016/j.msea.2019.138054 %T Recrystallization behavior and its relationship with deformation mechanisms of a hot rolled Mg-Zn-Ca-Zr alloy %U https://doi.org/10.1016/j.msea.2019.138054 %X The microstructure-texture evolution of twin-roll-cast strips of an Mg-Zn-Ca-Zr alloy subjected to hot rolling and recrystallization annealing was investigated. Upon annealing, a distinctive change in the main texture components is observed from basal poles tilted towards the rolling direction (RD) to basal poles tilted towards the transverse direction (TD). X-ray diffraction analysis and EBSD measurements indicated that the distinct change of the texture components during recrystallization annealing is related to the weakening of the global texture intensity. It is demonstrated that the controlling mechanism of the microstructure development during the annealing is the growth of recovered volumes within deformed grains in a regime of a continuous type of recrystallization. Recrystallized grains developed from the {1 0–1 1}-{1 0–1 2} secondary twinned areas were observed, which show a restricted contribution to the recrystallized microstructure formed in a discontinuous type of recrystallization. In-grain misorientation axis analysis from the as-rolled microstructure indicates that prismatic together with basal slip become the dominant dislocation modes for the grains with their c-axis inclined relative to the normal direction. Several grains with the orientations of the basal pole split to the transverse direction are the {1 0–1 2} extension twins. This leads to a mirror symmetry of the basal poles along the transverse direction. It is observed that during recrystallization annealing, deformed volumes of grains containing {1 0–1 2} extension twins can recover effectively. This leads to the development of grains having the TD-split orientation in the regime of continuous static recrystallization also known as extended recovery. %0 journal article %@ %A Piracha, A.,Sabia, R.,Klockmann, M.,Castaldo, L.,Fernández, D. %D 2019 %J Frontiers in Marine Science %N %P 589 %R doi:10.3389/fmars.2019.00589 %T Satellite-Driven Estimates of Water Mass Formation and Their Spatio-Temporal Evolution %U https://doi.org/10.3389/fmars.2019.00589 %X We derive water mass transformation and formation rates using satellite-derived datasets of salinity, temperature and fluxes of heat and freshwater over the North Atlantic, North Pacific and Southern Ocean. The formation rates are expressed in three coordinate systems: (1) density, (2) temperature-salinity and (3) latitude-longitude. In the North Atlantic and North Pacific, peak formation occurs south of the western boundary current extensions during the winter months of the study period. In the Southern Ocean, wintertime peak formation occurs just north of the sub-Antarctic Front. The satellite-derived water mass properties and formation areas agree well with previous estimates from literature. The location of peak Mode Water formation varies slightly with time in all coordinate systems. We assess seasonal and inter-annual variability in all three basins from 2012 to 2014. We assess the impact of satellite uncertainties on final estimates of formation rates and areas with Monte-Carlo simulations. The simulations provide insights on the associated uncertainty of formation estimates. They also provide information on the geographic spread of the water mass formation area subject to the satellite errors. We find that the total uncertainty is dominated by the uncertainty in the sea surface salinity dataset. This stresses the need for frequent and increasingly accurate sea surface salinity data for reliable estimates of water mass formation rates and areas. Our study highlights the feasibility of providing satellite-based estimates of water mass formation rates and areas. The good spatio-temporal coverage of satellite data further adds to the utility of the approach. %0 journal article %@ 0930-7575 %A Vautard, R.,Christidis, N.,Ciavarella, A.,Alvarez-Castro, C.,Bellprat, O.,Christiansen, B.,Colfescu, I.,Cowan, T.,Doblas-Reyes, F.,Eden, J.,Hauser, M.,Hegerl, G.,Hempelmann, N.,Klehmet, K.,Lott, F.,Nangini, C.,Orth, R.,Radanovics, S.,Seneviratne, S.I.,Oldenborgh, G.J.van,Stott, P.,Tett, S.,Wilcox, L.,Yiou, P. %D 2019 %J Climate Dynamics %N 1-2 %P 1187-1210 %R doi:10.1007/s00382-018-4183-6 %T Evaluation of the HadGEM3-A simulations in view of detection and attribution of human influence on extreme events in Europe %U https://doi.org/10.1007/s00382-018-4183-6 1-2 %X A detailed analysis is carried out to assess the HadGEM3-A global atmospheric model skill in simulating extreme temperatures, precipitation and storm surges in Europe in the view of their attribution to human influence. The analysis is performed based on an ensemble of 15 atmospheric simulations forced with observed sea surface temperature of the 54 year period 1960–2013. These simulations, together with dual simulations without human influence in the forcing, are intended to be used in weather and climate event attribution. The analysis investigates the main processes leading to extreme events, including atmospheric circulation patterns, their links with temperature extremes, land–atmosphere and troposphere-stratosphere interactions. It also compares observed and simulated variability, trends and generalized extreme value theory parameters for temperature and precipitation. One of the most striking findings is the ability of the model to capture North-Atlantic atmospheric weather regimes as obtained from a cluster analysis of sea level pressure fields. The model also reproduces the main observed weather patterns responsible for temperature and precipitation extreme events. However, biases are found in many physical processes. Slightly excessive drying may be the cause of an overestimated summer interannual variability and too intense heat waves, especially in central/northern Europe. However, this does not seem to hinder proper simulation of summer temperature trends. Cold extremes appear well simulated, as well as the underlying blocking frequency and stratosphere-troposphere interactions. Extreme precipitation amounts are overestimated and too variable. The atmospheric conditions leading to storm surges were also examined in the Baltics region. There, simulated weather conditions appear not to be leading to strong enough storm surges, but winds were found in very good agreement with reanalyses. The performance in reproducing atmospheric weather patterns indicates that biases mainly originate from local and regional physical processes. This makes local bias adjustment meaningful for climate change attribution. %0 journal article %@ 2199-384X %A Braz Fernandes, F.,Camacho, E.,Rodrigues, P.,Inacio, P.,Santos, T.,Schell, N. %D 2019 %J Shape Memory and Superelasticity %N %P 457-467 %R doi:10.1007/s40830-019-00237-2 %T In Situ Structural Characterization of Functionally Graded Ni–Ti Shape Memory Alloy During Tensile Loading %U https://doi.org/10.1007/s40830-019-00237-2 %X A functionally graded NiTi shape memory alloy wire was investigated by in situ synchrotron radiation-based X-ray diffraction (SR-XRD) during cyclic tensile deformation. The transformation temperatures were determined by DSC and the thermomechanical behaviour was analysed by three-point bending test. The present study focussed on the localized heat treatment (Joule heat effect, reaching 300 °C, 350 and 400 °C pulses for 10 min) of NiTi wires, using an equipment that allows a large variety of graded conditions. Structural, mechanical and thermomechanical characterization is presented to get a perspective of the different types of graded functionality. A combination of two strategies has been used for the in situ analysis by SR-XRD of the tensile tests: (i) continuously following the structural evolution at one single point (at the center of the heat-treated segment) all long the load/unload cycle and (ii) scanning the full heat-treated segmentat previously defined discrete steps of the stress–strain curve. The combined information from both types of tests provided detailed information about the phase transformations taking place in different regions of the functionally graded segment, at different steps of the tensile load/unload cycle, giving a better understanding of the overall mechanical, namely the evidence of the sequence B2 ↔ R ↔ B19′ for the direct and reverse transformations. %0 journal article %@ 2075-4701 %A Yi, S.,Victoria-Hernandez, J.,Kim, Y.M.,Letzig, D.,You, B.S. %D 2019 %J Metals %N 2 %P 181 %R doi:10.3390/met9020181 %T Modification of Microstructure and Texture in Highly Non-Flammable Mg-Al-Zn-Y-Ca Alloy Sheets by Controlled Thermomechanical Processes %U https://doi.org/10.3390/met9020181 2 %X The influence of rolling temperature and pass reduction degree on microstructure and texture evolution was investigated using an AZXW3100 alloy, Mg-3Al-1Zn-0.5Ca-0.5Y, in wt.%. The change in the rolling schedule had a significant influence on the resulting texture and microstructure from the rolling and subsequent annealing. A relatively strong basal-type texture with a basal pole split into the rolling direction was formed by rolling at 450 °C with a decreasing scheme of the pass reduction degrees with a rolling step, while the tilted basal poles in the transverse direction were developed by using an increasing scheme of the pass reduction degrees. Rolling at 500 °C results in a further distinct texture type with a far more largely tilted basal pole into the rolling direction. The directional anisotropy of the mechanical properties in the annealed sheets was caused by the texture and microstructural features, which were in turn influenced by the rolling condition. The Erichsen index of the sheets varied in accordance to the texture sharpness, i.e., the weaker the texture the higher the formability. The sheet with a tetrarchy distribution of the basal poles into the transverse and rolling directions shows an excellent formability with an average Erichsen index of 8.1. %0 journal article %@ 2296-8016 %A Victoria-Hernández, J.,Yi, S.,Klaumünzer, D.,Letzig, D. %D 2019 %J Frontiers in Materials %N %P 288 %R doi:10.3389/fmats.2019.00288 %T Comparison of the mechanical properties and forming behavior of two texture-weakened Mg-sheet alloys produced by twin roll casting %U https://doi.org/10.3389/fmats.2019.00288 %X The influence of rolling and annealing on the resulting mechanical properties and forming behavior of Mg-Zn-RE and Mg-Zn-Ca alloys produced via twin roll casting is investigated. After hot rolling followed by an annealing treatment, both alloys develop a fine-grained microstructure with average grain sizes <10 μm. A distinctive development of a texture with a pronounced split of the basal poles in the transverse direction, so called TD-split, is observed in both alloys during the annealing. Due to the fine microstructure and weak texture, which enhances the activation of basal slip, both alloys show large ductility with fracture strain higher than 30%. However, due to the TD-split texture, a high asymmetry of the yield stress is observed, where the yield stress in rolling direction is significantly higher than the yield stress along 45° and the transverse direction. Both alloys show high stretch formability at room temperature with Erichsen index around 7. Despite a low planar anisotropy and high stretch formability, the Mg-Zn-RE alloy shows undesirable earing behavior, while the Mg-Zn-Ca alloy fractures during warm deep drawing. Moreover, the deep drawing operation using the as-rolled sheet of Mg-Zn-RE alloy can be successfully done. It is observed that the earing behavior can be effectively reduced by deviating from the TD-split texture. In this regard, cold rolling was explored to reduce the anisotropy of the ductile and formable alloy. %0 journal article %@ 2296-7745 %A Lombard, F.,Boss, E.,Waite, A.M.,Uitz, J.,Stemmann, L.,Sosik, H.M.,Schulz, J.,Romagnan, J.-B.,Picheral, M.,Pearlman, J.,Ohman, M.D.,Niehoff, B.,Möller, K.O.,Miloslavich, P.,Lara-Lopez, A.,Kudela, R.M.,Lopes, R.M.,Karp-Boss, L.,Kiko, R.,Jaffe, J.S.,Iversen, M.H.,Irisson, J.-O.,Hauss, H.,Guidi, L.,Gorsky, G.,Giering, S.L.C.,Gaube, P.,Gallager, S.,Dubelaar, G.,Cowen, R.K.,Carlotti, F.,Briseño-Avena, C.,Berline, L.,Benoit-Bird, K.J.,Bax, N.J.,Batten, S.D.,Ayata, S.-D.,Appeltans, W. %D 2019 %J Frontiers in Marine Science %N %P 196 %R doi:10.3389/fmars.2019.00196 %T Globally Consistent Quantitative Observations of Planktonic Ecosystems %U https://doi.org/10.3389/fmars.2019.00196 %X In this paper we review the technologies available to make globally quantitative observations of particles in general—and plankton in particular—in the world oceans, and for sizes varying from sub-microns to centimeters. Some of these technologies have been available for years while others have only recently emerged. Use of these technologies is critical to improve understanding of the processes that control abundances, distributions and composition of plankton, provide data necessary to constrain and improve ecosystem and biogeochemical models, and forecast changes in marine ecosystems in light of climate change. In this paper we begin by providing the motivation for plankton observations, quantification and diversity qualification on a global scale. We then expand on the state-of-the-art, detailing a variety of relevant and (mostly) mature technologies and measurements, including bulk measurements of plankton, pigment composition, uses of genomic, optical and acoustical methods as well as analysis using particle counters, flow cytometers and quantitative imaging devices. We follow by highlighting the requirements necessary for a plankton observing system, the approach to achieve it and associated challenges. We conclude with ranked action-item recommendations for the next 10 years to move toward our vision of a holistic ocean-wide plankton observing system. Particularly, we suggest to begin with a demonstration project on a GO-SHIP line and/or a long-term observation site and expand from there, ensuring that issues associated with methods, observation tools, data analysis, quality assessment and curation are addressed early in the implementation. Global coordination is key for the success of this vision and will bring new insights on processes associated with nutrient regeneration, ocean production, fisheries and carbon sequestration. %0 journal article %@ 0930-7575 %A Tamoffo, A.,Moufouma-Okia, W.,Dosio, A.,James, R.,Pokam, W.,Vondou, D.,Fotso-Nguemo, T.,Guenang, G.,Kamsu-Tamo, P.,Nikulin, G.,Longandjo, G.,Lennard, C.,Bell, J.,Takong, R.,Haensler, A.,Djiotang Tchotchou, L.,Nouayou, R. %D 2019 %J Climate Dynamics %N %P 1911-1935 %R doi:10.1007/s00382-019-04751-y %T Process-oriented assessment of RCA4 regional climate model projections over the Congo Basin under 1.5 °C and 2 °Cglobal warming levels: influence of regional moisture fluxes %U https://doi.org/10.1007/s00382-019-04751-y %X Understanding the processes responsible for precipitation and its future change is important to develop plausible and sustainable climate change adaptation strategies, especially in regions with few available observed data like Congo Basin (CB). This paper investigates the atmospheric circulation processes associated with climate model biases in CB rainfall, and explores drivers of projected rainfall changes. Here we use an ensemble of simulations from the Swedish Regional Climate Model (RCM) RCA4, driven by eight General Circulation Models (GCMs) from the Coupled Model Intercomparison Project Phase 5 (CMIP5), for the 1.5 ∘C and 2 ∘C global warming levels (GWLs), and under the representative concentration pathways (RCPs) 4.5 and 8.5. RCA4 captures reasonably well the observed patterns of CB rainfall seasonality, but shows dry biases independent of seasons and large scale driving atmospheric conditions. While simulations mimic observed peaks in transition seasons (March–May and September–November), the rain-belt is misplaced southward (northward) in December–February (June–August), reducing the latitudinal extent of rainfall. Moreover, ERA-Interim reanalysis driven RCM simulation and RCM–GCM combinations show similar results, indicating the dominance of systematic biases. Modelled dry biases are associated with dry upper-tropospheric layers, resulting from a western outflow stronger than the eastern inflow and related to the northern component of African Easterly Jet. From the analysis of the climate change signal, we found that regional scale responses to anthropogenic forcings vary across GWLs and seasons. Changes of rainfall and moisture divergence are correlated, with values higher in March–May than in September–November, and larger for global warming of 2.0 ∘C than at 1.5 ∘C. There is an increase of zonal moisture divergence fluxes in upper atmospheric layers (>700hPa) under RCP8.5 compared to RCP4.5. Moreover, it is found that additional warming of 0.5 ∘C will change the hydrological cycle and water availability in the CB, with potential to cause challenges to water resource management, agriculture, hydro-power generation, sanitation and ecosystems. %0 journal article %@ 1812-0784 %A Lewis, H.,Castillo Sanchez, J.,Siddorn, J.,King, R.,Tonani, M.,Saulter, A.,Sykes, P.,Pequignet, A.,Weedon, G.,Palmer, T.,Staneva, J.,Bricheno, L. %D 2019 %J Ocean Science %N 3 %P 669-690 %R doi:10.5194/os-15-669-2019 %T Can wave coupling improve operational regional ocean forecasts for the north-west European Shelf? %U https://doi.org/10.5194/os-15-669-2019 3 %X Operational ocean forecasts are typically produced by modelling systems run using a forced mode approach. The evolution of the ocean state is not directly influenced by surface waves, and the ocean dynamics are driven by an external source of meteorological data which are independent of the ocean state. Model coupling provides one approach to increase the extent to which ocean forecast systems can represent the interactions and feedbacks between ocean, waves, and the atmosphere seen in nature. This paper demonstrates the impact of improving how the effect of waves on the momentum exchange across the ocean–atmosphere interface is represented through ocean–wave coupling on the performance of an operational regional ocean prediction system. This study focuses on the eddy-resolving (1.5 km resolution) Atlantic Margin Model (AMM15) ocean model configuration for the north-west European Shelf (NWS) region.,A series of 2-year duration forecast trials of the Copernicus Marine Environment Monitoring Service (CMEMS) north-west European Shelf regional ocean prediction system are analysed. The impact of including ocean–wave feedbacks via dynamic coupling on the simulated ocean is discussed. The main interactions included are the modification of surface stress by wave growth and dissipation, Stokes–Coriolis forcing, and wave-height-dependent ocean surface roughness. Given the relevance to operational forecasting, trials with and without ocean data assimilation are considered.,Summary forecast metrics demonstrate that the ocean–wave coupled system is a viable evolution for future operational implementation. When results are considered in more depth, wave coupling was found to result in an annual cycle of relatively warmer winter and cooler summer sea surface temperatures for seasonally stratified regions of the NWS. This is driven by enhanced mixing due to waves, and a deepening of the ocean mixed layer during summer. The impact of wave coupling is shown to be reduced within the mixed layer with assimilation of ocean observations. Evaluation of salinity and ocean currents against profile measurements in the German Bight demonstrates improved simulation with wave coupling relative to control simulations. Further, evidence is provided of improvement to simulation of extremes of sea surface height anomalies relative to coastal tide gauges. %0 report part %@ %A Magnan, A.,Garschagen, M.,Gattuso, J.,Hay, J.,Hilmi, N.,Holland, E.,Isla, F.,Kofinas, G.,Losada, I.,Petzold, J.,Ratter, B.,Schuur, E.,Tabe, T.,Van De Wal, R. %D 2019 %J IPCC Special Report on the Ocean and Cryosphere in a Changing Climate %N %P 657-674 %T Cross-Chapter Box 9: Integrative Cross-Chapter Box on Low-Lying Islands and Coasts %U %X Ocean and cryosphere changes already impact Low-Lying Islands and Coasts (LLIC), including Small Island Developing States (SIDS), with cascading and compounding risks. Disproportionately higher risks are expected in the course of the 21st century. Reinforcing the findings of the IPCC Special Report on Global Warming of 1.5ºC, vulnerable human communities, especially those in coral reef environments and polar regions, may exceed adaptation limits well before the end of this century and even in a low greenhouse gas emission pathway (high confidence1). Depending on the effectiveness of 21st century mitigation and adaptation pathways under all emission scenarios, most of the low-lying regions around the world may face adaptation limits beyond 2100, due to the long-term commitment of sea level rise (medium confidence). LLIC host around 11% of the global population, generate about 14% of the global Gross Domestic Product and comprise many world cultural heritage sites. LLIC already experience climate-related ocean and cryosphere changes (high confidence), and they share both commonalities in their exposure and vulnerability to climate change (e.g., low elevation, human disturbances to terrestrial and marine ecosystems), and context-specificities (e.g., variable ecosystem climate sensitivities and risk perceptions by populations). Options to adapt to rising seas, e.g., range from hard engineering to ecosystem-based measures, and from securing current settings to relocating people, built assets and activities. Effective combinations of measures vary across geographies (cities and megacities, small islands, deltas and Arctic coasts), and reflect the scale of observed and projected impacts, ecosystems’ and societies’ adaptive capacity, and the existence of transformational governance (high confidence) {Sections 3.5.3, 4.4.2 to 4.4.5, 5.5.2, 6.8, 6.9, Cross-Chapter Box 2 in Chapter 1}. %0 journal article %@ 0025-3227 %A Yin, S.,Hernández-Molina, F.,Zhang, W.,Li, J.,Wang, L.,Ding, W. %D 2019 %J Marine Geology %N %P 105967 %R doi:10.1016/j.margeo.2019.105967 %T The influence of oceanographic processes on contourite features: A multidisciplinary study of the northern South China Sea %U https://doi.org/10.1016/j.margeo.2019.105967 %X This study examines how multiscale oceanographic processes interact with the seafloor to influence the development of contourite features in northern part of the South China Sea. The multidisciplinary approach used in this study combines physical oceanographic monitoring, numerical simulation, multibeam echosounding, seismic reflection profiling, and sediment core interpretation. The contourites detected and interpreted herein include depositional (drifts and sediment waves), erosional (channels, moats and furrows), and mixed erosional and depositional features (terraces and irregular depressions). This study finds that climatic variation influences the intensity of quasi-steady, along-slope regional water circulation which in turn influences the long-term development of primary (10–100 km) contourite depositional systems. Energetic but intermittent oceanographic processes (such as eddies and internal waves) generate smaller secondary features within the contourite depositional systems resulting in a complex, local seafloor morphology. Westward to south-westward migrating mesoscale eddies locally enhance regional water mass circulation and trigger sub-mesoscale flows which can generate (1–10 km) irregular depressions along their paths. Westward-propagating internal solitary waves form sedimentary waves. With the aid of numerical modelling results, a sedimentary model is proposed to explain how oceanographic processes influence sedimentary processes and determine a hierarchy of associated feature formation. This model can help advance understanding of how bottom currents influence sedimentary processes along continental margins and abyssal plains. %0 journal article %@ 1463-9076 %A Grasso, M.,Puszkiel, J.,Fernandez Albanesi, L.,Dornheim, M.,Pistidda, C.,Gennari, F. %D 2019 %J Physical Chemistry Chemical Physics %N 36 %P 19825-19834 %R doi:10.1039/c9cp03826d %T CO2 reutilization for methane production via a catalytic process promoted by hydrides %U https://doi.org/10.1039/c9cp03826d 36 %X CO2 emissions have been continuously increasing during the last half of the century with a relevant impact on the planet and are the main contributor to the greenhouse effect and global warming. The development of new technologies to mitigate these emissions poses a challenge. Herein, the recycling of CO2 to produce CH4 selectively by using Mg2FeH6 and Mg2NiH4 complex hydrides as dual conversion promoters and hydrogen sources has been demonstrated. Magnesium-based metal hydrides containing Fe and Ni catalyzed the hydrogenation of CO2 and their total conversion was obtained at 400 °C after 5 h and 10 h, respectively. The complete hydrogenation of CO2 depended on the complex hydride, H2 : CO2 mol ratio, and experimental conditions: temperature and time. For both hydrides, the activation of CO2 on the metal surface and its subsequent capture resulted in the formation of MgO. Investigations on the Mg2FeH6–CO2 system indicated that the main process occurs via the reversed water–gas shift reaction (WGSR), followed by the methanation of CO in the presence of steam. In contrast, the reduction of CO2 by the Mg-based hydride in the Mg2NiH4–CO2 system has a strong contribution to the global process. Complex metal hydrides are promising dual promoter-hydrogen sources for CO2 recycling and conversion into valuable fuels such as CH4. %0 journal article %@ 2469-9950 %A Cameron, A.S.,Yerin, Y.S.,Tymoshenko, Y.V.,Portnichenko, P.Y.,Sukhanov, A.S.,Hatnean, M.C.,Paul, D.M.K.,Balakrishnan, G.,Cubitt, R.,Heinemann, A.,Inosov, D.S. %D 2019 %J Physical Review B %N 2 %P 024518 %R doi:10.1103/PhysRevB.100.024518 %T Rotation of the magnetic vortex lattice in Ru7B3 driven by the effects of broken time-reversal and inversion symmetry %U https://doi.org/10.1103/PhysRevB.100.024518 2 %X We observe a hysteretic reorientation of the magnetic vortex lattice in the noncentrosymmetric superconductor Ru7B3, with the change in orientation driven by altering the magnetic field below Tc. Normally a vortex lattice chooses either a single or degenerate set of orientations with respect to a crystal lattice at any given field or temperature, a behavior well described by prevailing phenomenological and microscopic theories. Here, in the absence of any typical VL structural transition, we observe a continuous rotation of the vortex lattice which exhibits a pronounced hysteresis and is driven by a change in magnetic field. We propose that this rotation is related to the spontaneous magnetic fields present in the superconducting phase, which are evidenced by the observation of time-reversal symmetry breaking, and the physics of broken inversion symmetry. Finally, we develop a model from the Ginzburg-Landau approach which shows that the coupling of these to the vortex lattice orientation can result in the rotation we observe. %0 journal article %@ 2296-7745 %A Le Traon, P.Y.,Reppucci, A.,Fanjul, E.A.,Aouf, L.,Behrens, A.,Belmonte, M.,Bentamy, A.,Bertino, L.,Brando, V.E.,Kreiner, M.B.,Benkiran, M.,Carval, T.,Ciliberti, S.A.,Claustre, H.,Clementi, E.,Coppini, G.,Cossarini, G.,De Alfonso Alonso-Muñoyerro, M.,Delamarche, A.,Dibarboure, G.,Dinessen, F.,Drevillon, M.,Drillet, Y.,Faugere, Y.,Fernández, V.,Fleming, A.,Garcia-Hermosa, M.I.,Sotillo, M.G.,Garric, G.,Gasparin, F.,Giordan, C.,Gehlen, M.,Gregoire, M.L.,Guinehut, S.,Hamon, M.,Harris, C.,Hernandez, F.,Hinkler, J.B.,Hoyer, J.,Karvonen, J.,Kay, S.,King, R.,Lavergne, T.,Lemieux-Dudon, B.,Lima, L.,Mao, C.,Martin, M.J.,Masina, S.,Melet, A.,Nardelli, B.B.,Nolan, G.,Pascual, A.,Pistoia, J.,Palazov, A.,Piolle, J.F.,Pujol, M.I.,Pequignet, A.C.,Peneva, E.,Gómez, B.P.,de la Villeon, L.P.,Pinardi, N.,Pisano, A.,Pouliquen, S.,Reid, R.,Remy, E.,Santoleri, R.,Siddorn, J.,She, J.,Staneva, J.,Stoffelen, A.,Tonani, M.,Vandenbulcke, L.,von Schuckmann, K.,Volpe, G.,Wettre, C.,Zacharioudaki, A. %D 2019 %J Frontiers in Marine Science %N %P 234 %R doi:10.3389/fmars.2019.00234 %T From Observation to Information and Users: The Copernicus Marine Service Perspective %U https://doi.org/10.3389/fmars.2019.00234 %X The Copernicus Marine Environment Monitoring Service (CMEMS) provides regular and systematic reference information on the physical and biogeochemical ocean and sea-ice state for the global ocean and the European regional seas. CMEMS serves a wide range of users (more than 15,000 users are now registered to the service) and applications. Observations are a fundamental pillar of the CMEMS value-added chain that goes from observation to information and users. Observations are used by CMEMS Thematic Assembly Centres (TACs) to derive high-level data products and by CMEMS Monitoring and Forecasting Centres (MFCs) to validate and constrain their global and regional ocean analysis and forecasting systems. This paper presents an overview of CMEMS, its evolution, and how the value of in situ and satellite observations is increased through the generation of high-level products ready to be used by downstream applications and services. The complementary nature of satellite and in situ observations is highlighted. Long-term perspectives for the development of CMEMS are described and implications for the evolution of the in situ and satellite observing systems are outlined. Results from Observing System Evaluations (OSEs) and Observing System Simulation Experiments (OSSEs) illustrate the high dependencies of CMEMS systems on observations. Finally future CMEMS requirements for both satellite and in situ observations are detailed. %0 journal article %@ 2296-7745 %A Davidson, F.,Alvera-Azcárate, A.,Barth, A.,Brassington, G.B.,Chassignet, E.P.,Clementi, E.,De Mey-Frémaux, P.,Divakaran, P.,Harris, C.,Hernandez, F.,Hogan, P.,Hole, L.R.,Holt, J.,Liu, G.,Lu, Y.,Lorente, P.,Maksymczuk, J.,Martin, M.,Mehra, A.,Melsom, A.,Mo, H.,Moore, A.,Oddo, P.,Pascual, A.,Pequignet, A.-C.,Kourafalou, V.,Ryan, A.,Siddorn, J.,Smith, G.,Spindler, D.,Spindler, T.,Stanev, E.V.,Staneva, J.,Storto, A.,Tanajura, C.,Vinayachandran, P.N.,Wan, L.,Wang, H.,Zhang, Y.,Zhu, X.,Zu, Z. %D 2019 %J Frontiers in Marine Science %N %P 450 %R doi:10.3389/fmars.2019.00450 %T Synergies in Operational Oceanography: The Intrinsic Need for Sustained Ocean Observations %U https://doi.org/10.3389/fmars.2019.00450 %X Operational oceanography can be described as the provision of routine oceanographic information needed for decision-making purposes. It is dependent upon sustained research and development through the end-to-end framework of an operational service, from observation collection to delivery mechanisms. The core components of operational oceanographic systems are a multi-platform observation network, a data management system, a data assimilative prediction system, and a dissemination/accessibility system. These are interdependent, necessitating communication and exchange between them, and together provide the mechanism through which a clear picture of ocean conditions, in the past, present, and future, can be seen. Ocean observations play a critical role in all aspects of operational oceanography, not only for assimilation but as part of the research cycle, and for verification and validation of products. Data assimilative prediction systems are advancing at a fast pace, in tandem with improved science and the growth in computing power. To make best use of the system capability these advances would be matched by equivalent advances in operational observation coverage. This synergy between the prediction and observation systems underpins the quality of products available to stakeholders, and justifies the need for sustained ocean observations. In this white paper, the components of an operational oceanographic system are described, highlighting the critical role of ocean observations, and how the operational systems will evolve over the next decade to improve the characterization of ocean conditions, including at finer spatial and temporal scales. %0 journal article %@ 2296-7745 %A Roemmich, D.,Alford, M.H.,Claustre, H.,Johnson, K.S.,King, B.,Moum, J.,Oke, P.R.,Owens, W.B.,Pouliquen, S.,Purkey, S.,Scanderbeg, M.,Suga, T.,Wijffels, S.E.,Zilberman, N.,Bakker, D.,Baringer, M.O.,Belbeoch, M.,Bittig, H.C.,Boss, E.,Calil, P.,Carse, F.,Carval, T.,Chai, F.,Conchubhair, D.O.,D'Ortenzio, F.,Dall'Olmo, G.,Desbruyères, D.,Fennel, K.,Fer, I.,Ferrari, R.,Forget, G.,Freeland, H.,Fujiki, T.,Gehlen, M.,Greenan, B.,Hallberg, R.,Hibiya, T.,Hosoda, S.,Jayne, S.,Jochum, M.,Johnson, G.C.,Kang, K.-R.,Kolodziejczyk, N.,Koertzinger, A.,Le Traon, P.Y.,Lenn, Y.-D.,Maze, G.,Mork, K.A.,Morris, T.,Nagai, T.,Nash, J.,Garabato, A.N.,Olsen, A.,Pattabhi, R.R.,Prakash, S.,Riser, S.,Schmechtig, C.,Shroyer, E.,Sterl, A.,Sutton, P.,Talley, L.,Tanhua, T.,Thierry, V.,Thomalla, S.,Toole, J.,Troisi, A.,Trull, T.,Turton, J.D.,Velez-Belchi, P.J.,Walczowski, W.,Wang, H.,Wanninkhof, R.,Waterhouse, A.,Watson, A.,Wilson, C.,Wong, A.P.,Xu, J.,Yasuda, I. %D 2019 %J Frontiers in Marine Science %N %P 439 %R doi:10.3389/fmars.2019.00439 %T On the Future of Argo: A Global, Full-Depth, Multi-Disciplinary Array %U https://doi.org/10.3389/fmars.2019.00439 %X The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. Argo provides continuous observations of ocean temperature and salinity versus pressure, from the sea surface to 2000 dbar. The successful installation of the Argo array and its innovative data management system arose opportunistically from the combination of great scientific need and technological innovation. Through the data system, Argo provides fundamental physical observations with broad societally-valuable applications, built on the cost-efficient and robust technologies of autonomous profiling floats. Following recent advances in platform and sensor technologies, even greater opportunity exists now than 20 years ago to (i) improve Argo’s global coverage and value beyond the original design, (ii) extend Argo to span the full ocean depth, (iii) add biogeochemical sensors for improved understanding of oceanic cycles of carbon, nutrients, and ecosystems, and (iv) consider experimental sensors that might be included in the future, for example to document the spatial and temporal patterns of ocean mixing. For Core Argo and each of these enhancements, the past, present, and future progression along a path from experimental deployments to regional pilot arrays to global implementation is described. The objective is to create a fully global, top-to-bottom, dynamically complete, and multidisciplinary Argo Program that will integrate seamlessly with satellite and with other in situ elements of the Global Ocean Observing System (Legler et al., 2015). The integrated system will deliver operational reanalysis and forecasting capability, and assessment of the state and variability of the climate system with respect to physical, biogeochemical, and ecosystems parameters. It will enable basic research of unprecedented breadth and magnitude, and a wealth of ocean-education and outreach opportunities. %0 conference lecture %@ %A Leonhardt, A.,Kurz, G.,Victoria-Hernandez, J.,Kraeusel, V.,Landgrebe, D.,Letzig, D. %D 2018 %J 17th International Conference on Metal Forming, Metal Forming 2018 %N %P %T Experimental study on incremental sheet forming of magnesium alloy AZ31 with hot air heating %U %X %0 conference poster %@ %A Kreuzpaintner, W.,Mayr, S.,Ye, J.,Wiedemann, B.,Book, A.,Inanloo-Maranloo, Z.,Mairoser, T.,Schmehl, A.,Herrnberger, A.,Stahn, J.,Moulin, J.,Korelis, P.,Haese, M.,Pomm, M.,Heigl, M.,Böni, P.,Mannhart, J.,Albrecht, M. %D 2018 %J 9th JEMS Conference 2018: Joint European Magnetic Symposia %N %P %T In situ Thin Film Growth for Polarized Neutron Reflectometry %U %X %0 conference lecture %@ %A Cano-Castillo, G.,Bohlen, J.,Victoria-Hernandez, J.,Letzig, D.,Kainer, K.U. %D 2018 %J FEMS Junior EUROMAT 2018 Conference %N %P %T The recrystallization behavior of extruded Mg-Zn alloys with Rare earths addition %U %X %0 journal article %@ 2169-9275 %A Testor, P.,Bosse, A.,Houpert, L.,Margirier, F.,Mortier, L.,Legoff, H.,Dausse, D.,Labaste, M.,Karstensen, J.,Hayes, D.,Olita, A.,Ribotti, A.,Schroeder, K.,Chiggiato,, J.,Onken, R.,Heslop, E.,Mourre, B.,D'Ortenzio, F.,Mayot, N.,Lavigne, H.,de Fommervault, O.,Coppola, L.,Prieur, L.,Taillandier, V.,Durrieu de Madron, X.,Bourrin, F.,Many, G.,Damien, P.,Estournel, C.,Marsaleix, P.,Taupier-Letage, I.,Raimbault, P.,Waldman, R.,Bouin, M.-N.,Giordani, H.,Caniaux, G.,Somot, S.,Ducrocq, V.,Conan, P. %D 2018 %J Journal of Geophysical Research : Oceans %N 3 %P 1745-1776 %R doi:10.1002/2016JC012671 %T Multiscale Observations of Deep Convection in the Northwestern Mediterranean Sea During Winter 2012-2013 Using Multiple Platforms %U https://doi.org/10.1002/2016JC012671 3 %X During winter 2012-2013, open-ocean deep convection which is a major driver for the thermohaline circulation and ventilation of the ocean, occurred in the Gulf of Lions (Northwestern Mediterranean Sea) and has been thoroughly documented thanks in particular to the deployment of several gliders, Argo profiling floats, several dedicated ship cruises, and a mooring array during a period of about a year. Thanks to these intense observational efforts, we show that deep convection reached the bottom in winter early in February 2013 in a area of maximum 28±3 109m9. We present new quantitative results with estimates of heat and salt content at the sub-basin scale at different time scales (on the seasonal scale to a ten days basis) through optimal interpolation techniques, and robust estimates of the deep water formation rate of 2.0 ± 0.2Sν. We provide an overview of the spatio-temporal coverage that has been reached throughout the seasons this year and we highlight some results based on data analysis and numerical modeling that are presented in this special issue. They concern key circulation features for the deep convection and the subsequent bloom such as Submesoscale Coherent Vortices (SCVs), the plumes and symmetric instability at the edge of the deep convection area. %0 journal article %@ 0014-3057 %A Escorial, L.,de la Viuda, M.,Rodriguez, S.,Tena, A.,Marcos, A.,Palacio, L.,Pradanos, P.,Lozano, A.E.,Hernandez, A. %D 2018 %J European Polymer Journal %N %P 390-399 %R doi:10.1016/j.eurpolymj.2018.04.031 %T Partially pyrolized gas-separation membranes made from blends of copolyetherimides and polyimides %U https://doi.org/10.1016/j.eurpolymj.2018.04.031 %X Herein, a new approach to achieve gas separation materials with improved resistance to plasticization (obtained by partial pyrolysis of new polyimide blends) is presented. Blends of an aromatic polyimide (formally, 6FDA-6FpDA) and aliphatic-aromatic copolyetherimides based on the same polyimide in combination with other aliphatic polyimides, having polyethylene oxide moieties, were obtained. After their synthesis and characterization, a selective elimination of the polyether by thermal treatment was carried and the obtained partially-pyrolyzed materials were tested as gas separation membranes.,For neat blends, permeability was shown to decrease when PEO content increases. This effect is due to polyethylene oxide (PEO) chains encroaching on free volume because phase segregation was minimized. When these blends were subjected to thermal treatment at relatively low temperatures in air or in N2, it was clearly observed that all the polyether moieties were selectively eliminated from the structure, which gave rise to an increase of permeability. Higher permeabilities were obtained after a thermal treatment at 390 °C in N2. Degradation of PEO chains after a 290 °C treatment in air produced materials with permeability values lower than those observed under N2. In both cases, even though PEO was selectively and wholly eliminated, permeability was not totally recovered to give the values observed for neat 6FDA-6FpDA due probably to a combination of shrinkage and crosslinking of the membrane produced during the thermal process. Crosslinking provides the materials with an increased resistance to plasticization. In particular, the best improvement against plasticization proceeded from the thermal treatments of blends at 290 °C in air. %0 journal article %@ 1381-5148 %A Diez, B.,Cuadrado, P.,Marcos-Fernandez, M.,de la Campa, J.G.,Tena, A.,Pradanos, P.,Palacio, L.,Lee, Y.M.,Alvarez, C.,Lotano, A.E.,Hernandez, A. %D 2018 %J Reactive and Functional Polymers %N %P 38-47 %R doi:10.1016/j.reactfunctpolym.2018.03.013 %T Thermally rearranged polybenzoxazoles made from poly(ortho-hydroxyamide)s. Characterization and evaluation as gas separation membranes %U https://doi.org/10.1016/j.reactfunctpolym.2018.03.013 %X Two series of aromatic poly(ortho-hydroxyamide)s (poly(o-hydroxyamide)s, HPAs) were prepared by reaction of two diamines, 2,2-bis(3-amino-4-hydroxyphenyl) propane (APA) and 2,2-bis(3-amino-4-hydroxyphenyl) hexafluoropropane (APAF), with four aromatic diacid chlorides; terephthaloyl dichloride (TPC), isophthaloyl dichloride (IPC), 2,2-bis[4-chlorocarbonylphenyl)hexafluoropropane (6FC) and 4,4′-sulfonyldibenzoyl dichloride (DBSC). Amorphous HPAs with high molecular weights (inherent viscosities higher than 0.5 dL/g) and relatively high glass transition temperatures (220–280 °C) were obtained. Dense membranes of HPAs were able to undergo a thermal rearrangement (TR) process to polybenzoxazoles (β-TR-PBOs) heating at moderate temperatures (between 250 and 375 °C), and their complete conversion was reached at a temperature below 375 °C, depending on the o-hydroxy diamine moiety, APA and APAF. The β-TR-PBOs films derived from APAF showed a higher thermal stability and higher Tg than those from APA. Gas separation properties of TR-PBOs membranes were superior to those of their poly(o-hydroxyamide) precursors, particularly for the following gas pairs: O2/N2, CO2/CH4, He/CH4 and He/CO2. %0 journal article %@ 1359-6462 %A Oliveira, J.P.,Cavaleiro, A.J.,Schell, N.,Stark, A.,Miranda, R.M.,Ocana, J.L.,Braz Fernandes, F.M. %D 2018 %J Scripta Materialia %N %P 122-126 %R doi:10.1016/j.scriptamat.2018.04.024 %T Effects of laser processing on the transformation characteristics of NiTi: A contribute to additive manufacturing %U https://doi.org/10.1016/j.scriptamat.2018.04.024 %X Laser additive manufacturing of NiTi generates complex microstructural features not fully understood yet. Thermal similarities between laser microjoining and laser additive manufacturing, enables correlating the effect of the laser on the material in both processes. To clarify them, a simplified yet accurate approach was employed: in-situ X-ray diffraction was used to determine the local transformation temperatures along the thermally affected regions in a laser processed NiTi thin sheet. The observed gradient of transformation temperatures is related to local chemical compositional changes through Ni depletion and residual stresses, explaining the peculiar microstructural and mechanical features observed in additive manufacturing of NiTi. %0 journal article %@ 1613-6810 %A Krishnan, M.R.,Lu, k.-Y.,Chiu, W.-Y.,Chen Chen, I.,Lin, J.-W.,Lo, T.-Y.,Georgopanos, P.,Avgeropoulos, A.,Lee, M.-C.,Ho, R.-M. %D 2018 %J Small %N 16 %P 1704005 %R doi:10.1002/smll.201704005 %T Directed Self-Assembly of Star-Block Copolymers by Topographic Nanopatterns through Nucleation and Growth Mechanism %U https://doi.org/10.1002/smll.201704005 16 %X Exploring the ordering mechanism and dynamics of self‐assembled block copolymer (BCP) thin films under confined conditions are highly essential in the application of BCP lithography. In this study, it is aimed to examine the self‐assembling mechanism and kinetics of silicon‐containing 3‐arm star‐block copolymer composed of polystyrene (PS) and poly(dimethylsiloxane) blocks as nanostructured thin films with perpendicular cylinders and controlled lateral ordering by directed self‐assembly using topographically patterned substrates. The ordering process of the star‐block copolymer within fabricated topographic patterns with PS‐functionalized sidewall can be carried out through the type of secondary (i.e., heterogeneous) nucleation for microphase separation initiated from the edge and/or corner of the topographic patterns, and directed to grow as well‐ordered hexagonally packed perpendicular cylinders. The growth rate for the confined microphase separation is highly dependent upon the dimension and also the geometric texture of the preformed pattern. Fast self‐assembly for ordering of BCP thin film can be achieved by lowering the confinement dimension and also increasing the concern number of the preformed pattern, providing a new strategy for the design of BCP lithography from the integration of top‐down and bottom‐up approaches. %0 journal article %@ 1748-9326 %A Pokam Mba, W.,Longandjo, G.-N.T.,Moufouma-Okia, W.,Bell, J.-P.,James, R.,Vondou, D.A.,Haensler, A.,Fotso-Nguemo, T.C.,Guenang, G.M.,Tchotchou, A.L.D.,Kansu-Tamo, P.H.,Takong, R.R.,Nikulin, G.,Lennard, C.J.,Dosio, A. %D 2018 %J Environmental Research Letters %N 5 %P 055011 %R doi:10.1088/1748-9326/aab048 %T Consequences of 1.5 °C and 2 °C global warming levels for temperature and precipitation changes over Central Africa %U https://doi.org/10.1088/1748-9326/aab048 5 %X Discriminating climate impacts between 1.5 °C and 2 °C warming levels is particularly important for Central Africa, a vulnerable region where multiple biophysical, political, and socioeconomic stresses interact to constrain the region's adaptive capacity. This study uses an ensemble of 25 transient Regional Climate Model (RCM) simulations from the CORDEX initiative, forced with the Representative Concentration Pathway (RCP) 8.5, to investigate the potential temperature and precipitation changes in Central Africa corresponding to 1.5 °C and 2 °C global warming levels. Global climate model simulations from the Coupled Model Intercomparison Project phase 5 (CMIP5) are used to drive the RCMs and determine timing of the targeted global warming levels. The regional warming differs over Central Africa between 1.5 °C and 2 °C global warming levels. Whilst there are large uncertainties associated with projections at 1.5 °C and 2 °C, the 0.5 °C increase in global temperature is associated with larger regional warming response. Compared to changes in temperature, changes in precipitation are more heterogeneous and climate model simulations indicate a lack of consensus across the region, though there is a tendency towards decreasing seasonal precipitation in March–May, and a reduction of consecutive wet days. As a drought indicator, a significant increase in consecutive dry days was found. Consistent changes of maximum 5 day rainfall are also detected between 1.5 °C vs. 2 °C global warming levels. %0 journal article %@ 2351-9789 %A Leonhardt, A.,Kurz, G.,Victoria-Hernandez, J.,Kraeusel, V.,Landgrebe, D.,Letzig, D. %D 2018 %J Procedia Manufacturing %N %P 1192-1199 %R doi:10.1016/j.promfg.2018.07.369 %T Experimental study on incremental sheet forming of magnesium alloy AZ31 with hot air heating %U https://doi.org/10.1016/j.promfg.2018.07.369 %X Products of tomorrow are characterized by environmental sustainability, individuality and economic feasibility. This trend also occurs in the field of sheet metal forming. Lightweight materials such as magnesium alloys are applied to reduce the weight and concluding the CO2 emissions of cars. They are characterized by a high specific strength and almost inexhaustible availability. Applying them in innovative forming technologies offers the chance for various new products. Flexible forming technologies such as single-point incremental forming (SPIF) have been newly developed to meet the requirements of decreasing lot sizes and a rising variety of products and design. The application of SPIF on magnesium alloys is considered to be an outstanding approach to obtain innovative sheet metal products. For this reason, SPIF of the magnesium alloy AZ31 with a hot air heating system is investigated experimentally. The mechanical properties are investigated as well as the initial microstructure and texture of the AZ31. An experimental setup is designed for SPIF using a hot air blower for heating of the AZ31 sheet. The setup is tested in order to obtain a homogeneous sheet temperature distribution. Forming trials are performed to determine the critical wall angle of a cone for temperatures up to 320 °C. During the experiments the occurring forming forces are investigated. Subsequently, an analysis is conducted of the sheet thickness distribution, the geometrical accuracy and the microstructure development. %0 journal article %@ 2076-3417 %A Zielinski, O.,Rüssmeier, N.,Ferdinand, O.,Miranda, M.,Wollschläger, J. %D 2018 %J Applied Sciences %N 12 %P 2685 %R doi:10.3390/app8122685 %T Assessing Fluorescent Organic Matter in Natural Waters: Towards In Situ Excitation–Emission Matrix Spectroscopy %U https://doi.org/10.3390/app8122685 12 %X Natural organic matter (NOM) is a key parameter in aquatic biogeochemical processes. Part of the NOM pool exhibits optical properties, namely absorption and fluorescence. The latter is frequently utilized in laboratory measurements of its dissolved fraction (fluorescent dissolved organic matter, FDOM) through excitation–emission matrix spectroscopy (EEMS). We present the design and field application of a novel EEMS sensor system applicable in situ, the ‘Kallemeter’. Observations are based on a field campaign, starting in Norwegian coastal waters entering the Trondheimsfjord. Comparison against the bulk fluorescence of two commercial FDOM sensors exhibited a good correspondence of the different methods and the ability to resolve gradients and dynamics along the transect. Complementary laboratory EEM spectra measurements of surface water samples and their subsequent PARAFAC analysis revealed three dominant components while the ‘Kallemeter’ EEMS sensor system was able to produce reasonable EEM spectra in high DOM concentrated water bodies, yet high noise levels must be addressed in order to provide comparable PARAFAC components. Achievements and limitations of this proof-of-concept are discussed providing guidance towards full in situ EEMS measurements to resolve rapid changes and processes in natural waters based on the assessment of spectral properties. Their combination with multiwavelength FDOM sensors onboard autonomous platforms will enhance our capacities in observing biogeochemical processes in the marine environment in spatiotemporal and spectral dimensions. %0 conference lecture (invited) %@ %A Victoria-Hernandez, J.,Kurz, G.,Suh, J.S.,Letzig, D. %D 2018 %J 10th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2018 %N %P %T Microstructure development and related mechanical behavior of the ZEW200 Mg alloy processed by differential speed rolling and equal channel angular pressing %U %X %0 conference paper %@ %A Victoria-Hernandez, J.,Kurz, G.,Suh, J.S.,Letzig, D. %D 2018 %J Proceedings of 10th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2018 %N %P 931 %T Microstructure development and related mechanical behavior of the ZEW200 Mg alloy processed by differential speed rolling and equal channel angular pressing %U %X %0 conference paper %@ 0255-5476 %A Victoria-Hernandez, J.,Kurz, G.,Suh, J.S.,Letzig, D. %D 2018 %J Materials Science Forum, THERMEC 2018 %N %P 931-936 %R doi:10.4028/www.scientific.net/MSF.941.931 %T Microstructure development and related mechanical behavior of the ZEW200 Mg alloy processed by differential speed rolling and equal channel angular pressing %U https://doi.org/10.4028/www.scientific.net/MSF.941.931 %X The present work investigates the influence of shear deformation on microstructural-texture and mechanical behavior of ZEW200 Mg alloy sheets. For the introduction of extra shear deformation during thermomechanical processing, the separate effect of differential speed rolling (DSR) and equal channel angular pressing (ECAP) were analyzed. The results were compared with the microstructure and mechanical behavior of equal speed rolled (ESR) ZEW200 sheets. No significant texture changes were observed after the utilization of DSR, while ECAP processing was effective in changing the character of the texture and reducing the texture intensity. The large yield stress asymmetry observed in the rolled sheet is strongly reduced in the ECAP processed sheets. Results showed the potential to use shear deformation to modify the crystallographic texture via the profuse activation of {10-12}<10-11> extension twins. The presence of a large twin fraction of the microstructure modified the work hardening behavior of the processed sheets due to the further activation of basal slip. The application of extra shear deformation to tailor the texture during processing is, therefore, an alternative to optimize the deformation behavior of already formable Mg alloys. %0 journal article %@ 0925-8388 %A Maury, N.,Denand, B.,Dehmas, M.,Archambeau-Mirguet, C.,Delfosse, J.,Aeby-Gautier, E. %D 2018 %J Journal of Alloys and Compounds %N %P 446-458 %R doi:10.1016/j.jallcom.2018.04.302 %T Influence of the ageing conditions and the initial microstructure on the precipitation of Alpha phase in Ti-17 alloy %U https://doi.org/10.1016/j.jallcom.2018.04.302 %X The precipitation of α phase during ageing was investigated in the near-β titanium alloy Ti-17 considering either a fully βmetastable initial microstructure or a 35% αprimary + 65% βmetastable initial microstructure. In-situ electrical resistivity and high energy X-ray diffraction measurements revealed the influence of the initial microstructure, with different α morphologies (size and distribution of αprimary), as well as the heating rate on the precipitation sequences and kinetics following the decomposition of the β-metastable phase. Various amounts of metastable phases (ωisothermal and α″isothermal) precipitate in temperature ranges that increase with the heating rate. From temperatures about 500 °C, the orthorhombic α″isothermal structure evolved towards the hexagonal close-packed α as temperature increased. SEM microstructure characterisations showed that slow heating rates promoted a fine and dense α precipitate distribution through the formation of ωisothermal and/or α″isothermal, leading to higher hardness values. A higher heating rate restricted the precipitation of α″isothermal and shifted to the one of α at a higher temperature, leading to coarser precipitates. Furthermore, precipitation kinetics of α″isothermal/α were quicker considering an initial intragranular α precipitation as compared to α colonies. %0 conference object %@ %A Cano-Castillo, G.,Bohlen, J.,Victoria-Hernandez, J.,Letzig, D.,Kainer, K.U. %D 2018 %J Book of Abstracts, FEMS Junior EUROMAT 2018 Conference, Design and Processing %N %P 112-113 %T The recrystallization behavior of extruded Mg-Zn alloys with Rare earths addition %U %X %0 journal article %@ 0587-4246 %A Yi, S.,Victoria-Hernandez, J.,Kim, Y.M.,Letzig, D.,You, B.S. %D 2018 %J Acta Physica Polonica A %N 3 %P 838-841 %R doi:10.12693/APhysPolA.134.838 %T Microstructure and property relationship controllable by thermomechanical processing of Mg-Al-Zn-Y-Ca alloy sheets %U https://doi.org/10.12693/APhysPolA.134.838 3 %X Sheet processing of conventional Mg alloys, such as Mg-3Al-1Zn (in wt.%), typically leads to the formation of so called basal-type texture in which the crystallographic -axis mostly align parallel to the sheet normal direction (ND). Such strong basal-type texture causes a limited formability under loading in the sheet normal and planar directions, due to the low Schmid factor for the basal -slip. By altering the strong basal-type texture, obtained by alloying addition of rare earth elements (REE) or Ca, the sheet formability can be considerably improved. The texture weakening and formability improvement have been reported in Mg-Zn-REE or Mg-Zn-Ca alloy systems. Regarding further properties such as corrosion resistance and non-flammability, it is important to provide a way of achieving weak texture and fine grained microstructure simultaneously in various alloy systems, especially Mg-Al alloys. The present study examined the influence of thermomechanical processing condition on the microstructure and texture evolution of a modified AZ31 alloy by Ca and Y addition. The rolling of AZXW3100 (Mg-3Al-1Zn-0.5Ca-0.5Y) alloy was conducted by using various parameters; 2 rolling temperatures of 450°C and 500°C, and the different pass reduction degrees (φ) of 0.1 ~ 0.3. The sheet rolled at 450°C and φ = 0.1 shows a relatively strong texture with a basal pole split into the sheet rolling direction (RD). On the contrary, the sheet rolled at 450°C with a larger step reduction degree, φ = 0.2 and φ = 0.3, shows the formation of significantly weak texture with basal pole split into the RD and the sheet transverse direction (TD). The rolling at 500°C results in a further distinct texture type in which the basal poles are largely tilted into the RD. The rolling condition influences also on the grain sizes of the recrystallized sheets, varying within a range of 6 µm and 21 µm after annealing at 400°C for 60 min of the differently rolled sheets. The Erichsen index (IE) of the sheets varies in accordance to the texture sharpness, i.e. the weaker texture the higher IE. The sheet having the basal pole split into the TD shows an excellent formability with IE of 8.5, which is about 3-fold higher value than that obtained in a conventional Mg alloy sheet. The experimental results indicate a clear relationship among the microstructure, texture and sheet formability which are controllable by thermomechanical treatments of the newly developed Mg alloy. %0 conference lecture %@ %A Braz Fernandes, F.,Camacho, E.,Rodrigues, P.,Inacio, P.,Santos, T.,Schell, N. %D 2018 %J The 11th European Symposium on Martensitic Transformations; ESOMAT 2018 %N %P %T In situ structural characterization of functionally graded Ni-Ti shape memory alloy during tensile loading %U %X A functionally graded NiTi shape memory alloy wire was investigated by in-situ synchrotron radiation-based x-ray diffraction during cyclic tensile deformation. The transformation temperatures were determined by DSC and the thermomechanical behaviour was analysed by three-point bending. The present study focussed on the localized heat treatment (Joule heat effect, reaching 300ºC, 350 and 400ºC pulses for 10 minutes) of NiTi wires, using an equipment that allows a large variety of localized heat treatments. Structural, mechanical and thermomechanical characterization is presented in order to get a perspective of the optimization parameters for the adequate graded functionality. Experimental results put in evidence the structural gradient resulting from the localized heat treatments. The analysis of the in-situ X-ray diffraction (XRD) provide detailed information about the phase transformations in different regions of the wire, at different steps of the cyclic load/unload, giving a better understanding of the overall mechanical behaviour of a functionally graded material. %0 journal article %@ 2169-897X %A Knist, S.,Goergen, K.,Buonomo, E.,Christensen, O.B.,Colette, A.,Cardoso, R.M.,Fealy, R.,Fernandez, J.,Garcia-Diez, M.,Jacob, D.,Kartsios, S.,Katragkou, E.,Keuler, K.,Mayer, S.,Meijgaard, E.van,Nikulin, G.,Soares, P.M.M.,Sobolowski, S.,Szepszo, G.,Teichmann, C.,Vautard, R.,Warrach-Sagi, K.,Wulfmeyer, V.,Simmer, C. %D 2017 %J Journal of Geophysical Research : Atmospheres %N 1 %P 79-103 %R doi:10.1002/2016JD025476 %T Land-atmosphere coupling in EURO-CORDEX evaluation experiments %U https://doi.org/10.1002/2016JD025476 1 %X Interactions between the land surface and the atmosphere play a fundamental role in the weather and climate system. Here we present a comparison of summertime land-atmosphere coupling strength found in a subset of the ERA-Interim-driven European domain Coordinated Regional Climate Downscaling Experiment (EURO-CORDEX) model ensemble (1989–2008). Most of the regional climate models (RCMs) reproduce the overall soil moisture interannual variability, spatial patterns, and annual cycles of surface exchange fluxes for the different European climate zones suggested by the observational Global Land Evaporation Amsterdam Model (GLEAM) and FLUXNET data sets. However, some RCMs differ substantially from FLUXNET observations for some regions. The coupling strength is quantified by the correlation between the surface sensible and the latent heat flux, and by the correlation between the latent heat flux and 2 m temperature. The first correlation is compared to its estimate from the few available long-term European high-quality FLUXNET observations, and the latter to results from gridded GLEAM data. The RCM simulations agree with both observational datasets in the large-scale pattern characterized by strong coupling in southern Europe and weak coupling in northern Europe. However, in the transition zone from strong to weak coupling covering large parts of central Europe many of the RCMs tend to overestimate the coupling strength in comparison to both FLUXNET and GLEAM. The RCM ensemble spread is caused primarily by the different land surface models applied, and by the model-specific weather conditions resulting from different atmospheric parameterizations. %0 journal article %@ 0885-7156 %A Rodrigues, P.,Braz Fernandes, F.M.,Paula, A.S.,Oliveira, J.P.,Ribero, S.B.,Texeira, E.N.,Schell, N. %D 2017 %J Powder Diffraction %N S1 %P S 201-206 %R doi:10.1017/S0885715617000549 %T Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging %U https://doi.org/10.1017/S0885715617000549 S1 %X The thermomechanical processing of NiTi shape memory alloys usually involves several steps of hot and/or cold deformation. The present work presents the structural characterization of a Ni-rich NiTi alloy bar, produced by vacuum-induced melting and thermomechanical processing in laboratory scale, aiming at massive production in the future. This study focused on the first step of hot working at 800 °C during rotary forging. Microstructural characterization was performed using differential scanning calorimetry, high- and low-temperature X-ray diffraction (XRD) using a laboratory source and synchrotron XRD. Thus, it was possible to obtain the phase transformation characteristics of the material: the transformation temperatures and the transformation sequence. Proposed thermomechanical processing is intended for production of bars and wires that will be subsequently drawn to get thin wires, for different applications, including orthodontic arch wires. %0 conference lecture (invited) %@ %A Yi, S.,Victoria-Hernandez, J.,Kim, Y.M.,Letzig, D.,You, B.S. %D 2017 %J 14th International Symposium on Physics of Materials, ISPMA 14 %N %P %T Microstructure and property relationship controllable by thermomechanical processing of Mg-Al-Zn-Y-Ca alloy sheets %U %X %0 journal article %@ 2296-7745 %A Rubio, A.,Mader, J.,Corgnati, L.,Mantovani, C.,Griffa, A.,Novellino, A.,Quentin, C.,Wyatt, L.,Schulz-Stellenfleth, J.,Horstmann, J.,Lorente, P.,Zambianchi, E.,Hartnett, M.,Fernandes, C.,Zervakis, V.,Gorringe, P.,Melet, A.,Puillat, I. %D 2017 %J Frontiers in Marine Science %N %P 08 %R doi:10.3389/fmars.2017.00008 %T HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network %U https://doi.org/10.3389/fmars.2017.00008 %X High Frequency Radar (HFR) is a land-based remote sensing instrument offering a unique insight to coastal ocean variability, by providing synoptic, high frequency and high resolution data at the ocean atmosphere interface. HFRs have become invaluable tools in the field of operational oceanography for measuring surface currents, waves and winds, with direct applications in different sectors and an unprecedented potential for the integrated management of the coastal zone. In Europe, the number of HFR networks has been showing a significant growth over the past 10 years, with over 50 HFRs currently deployed and a number in the planning stage. There is also a growing literature concerning the use of this technology in research and operational oceanography. A big effort is made in Europe toward a coordinated development of coastal HFR technology and its products within the framework of different European and international initiatives. One recent initiative has been to make an up-to-date inventory of the existing HFR operational systems in Europe, describing the characteristics of the systems, their operational products and applications. This paper offers a comprehensive review on the present status of European HFR network, and discusses the next steps toward the integration of HFR platforms as operational components of the European Ocean Observing System, designed to align and integrate Europe's ocean observing capacity for a truly integrated end-to-end observing system for the European coasts. %0 bachelor thesis %@ %A Fernandes Ribeiro, L. %D 2017 %J %N %P %T Estudo de Parametros de Soldagem e Caracterizacao Mecanica das Soldas Por Friccao e Mistura em Ligas de AlMgSc Aplicadas Para a Industria Aeronautica (Bachelorarbeit) %U %X %0 journal article %@ 2196-7350 %A Silva, E.L.,Mishra, Y.K.,Fernandes, A.J.S.,Silva, R.F.,Strobel, J.,Kienle, L.,Adelung, R.,Oliveira, F.J.,Zheludkevich, M.L. %D 2017 %J Advanced Materials Interfaces %N 10 %P 1700019 %R doi:10.1002/admi.201700019 %T Direct Synthesis of Electrowettable Carbon Nanowall–Diamond Hybrid Materials from Sacrificial Ceramic Templates Using HFCVD %U https://doi.org/10.1002/admi.201700019 10 %X Carbon‐on‐carbon materials carry the potential to be a major disruptive technology in fields like energy storage and electronics. In the present work, hot filament chemical vapor deposition (HFCVD) is used to synthesize carbon nanowall (CNW) tetrapods coupled to nanocrystalline diamond in a 3D hybrid network form. The CNW/diamond phase proportion as well as the structural morphology can be easily adjusted by the CVD parameters, allowing a single‐step synthesis of CNW micro‐ and nanopillars or CNW/diamond 3D hybrid materials, in the powder form or as interconnected free‐standing specimens. Additionally, the direct incorporation of SnO2 catalyst particles during the one‐step CVD process is demonstrated. µ‐Raman and electron microscopy are used to understand the evolution of the morphological characteristics associated to the growth mechanism. The electrowettability behavior of the novel CNW/diamond hybrid material is demonstrated by electrochemical polarization studies. Such multifunctional carbon‐based hybrid 3D nanomaterials can find promising applications in advanced technologies such as energy storage. %0 journal article %@ 1044-5803 %A Oliveira, J.P.,Braz Fernandes, F.M.,Miranda, R.M.,Schell, N.,Ocana, J.L. %D 2016 %J Materials Characterization %N %P 148-151 %R doi:10.1016/j.matchar.2016.08.001 %T Effect of laser welding parameters on the austenite and martensite phase fractions of NiTi %U https://doi.org/10.1016/j.matchar.2016.08.001 %X Although laser welding is probably the most used joining technique for NiTi shape memory alloys there is still a lack of understanding about the effects of laser welding parameters on the microstructural induced changes: in both the heat affected and fusion zones martensite may be present, while the base material is fully austenitic. Synchrotron X-ray diffraction was used for fine probing laser welded NiTi joints. Through Rietveld refinement the martensite and austenite phase fractions were determined and it was observed that the martensite content increases towards the weld centreline. This is related to a change of the local transformation temperatures on these regions, which occurs due to compositional variation in those regions. The martensite phase fraction in the thermally affected regions may have significant implications on functional properties on these joints. %0 journal article %@ 2199-384X %A Oliveira, J.P.,Braz Fernandes, F.M.,Miranda, R.M.,Schell, N. %D 2016 %J Shape Memory and Superelasticity %N 1 %P 114-120 %R doi:10.1007/s40830-016-0058-z %T On the mechanisms for martensite formation in YAG laser welded austenitic NiTi %U https://doi.org/10.1007/s40830-016-0058-z 1 %X Extensive work has been reported on the microstructure of laser-welded NiTi alloys either superelastic or with shape memory effect, motivated by the fact that the microstructure affects the functional properties. However, some effects of laser beam/material interaction with these alloys have not yet been discussed. This paper aims to discuss the mechanisms for the occurrence of martensite in the heat-affected zone and in the fusion zone at room temperature, while the base material is fully austenitic. For this purpose, synchrotron radiation was used together with a simple thermal analytic mathematical model. Two distinct mechanisms are proposed for the presence of martensite in different zones of a weld, which affects the mechanical and functional behavior of a welded component. %0 journal article %@ 0930-7575 %A Casanueva, A.,Kotlarski, S.,Herrera, S.,Fernandez, J.,Gutierrez, J.M.,Boberg, F.,Colette, A.,Christensen, O.B.,Goergen, K.,Jacob, D.,Keuler, K.,Nikulin, G.,Teichmann, C.,Vautard, R. %D 2016 %J Climate Dynamics %N 3 %P 719-737 %R doi:10.1007/s00382-015-2865-x %T Daily precipitation statistics in a EURO-CORDEX RCM ensemble: added value of raw and bias-corrected high-resolution simulations %U https://doi.org/10.1007/s00382-015-2865-x 3 %X Daily precipitation statistics as simulated by the ERA-Interim-driven EURO-CORDEX regional climate model (RCM) ensemble are evaluated over two distinct regions of the European continent, namely the European Alps and Spain. The potential added value of the high-resolution 12 km experiments with respect to their 50 km resolution counterparts is investigated. The statistics considered consist of wet-day intensity and precipitation frequency as a measure of mean precipitation, and three precipitation-derived indicators (90th percentile on wet days—90pWET, contribution of the very wet days to total precipitation—R95pTOT and number of consecutive dry days—CDD). As reference for model evaluation high resolution gridded observational data over continental Spain (Spain011/044) and the Alpine region (EURO4M-APGD) are used. The assessment and comparison of the two resolutions is accomplished not only on their original horizontal grids (approximately 12 and 50 km), but the high-resolution RCMs are additionally regridded onto the coarse 50 km grid by grid cell aggregation for the direct comparison with the low resolution simulations. The direct application of RCMs e.g. in many impact modelling studies is hampered by model biases. Therefore bias correction (BC) techniques are needed at both resolutions to ensure a better agreement between models and observations. In this work, the added value of the high resolution (before and after the bias correction) is assessed and the suitability of these BC methods is also discussed. Three basic BC methods are applied to isolate the effect of biases in mean precipitation, wet-day intensity and wet-day frequency on the derived indicators. Daily precipitation percentiles are strongly affected by biases in the wet-day intensity, whereas the dry spells are better represented when the simulated precipitation frequency is adjusted to the observed one. This confirms that there is no single optimal way to correct for RCM biases, since correcting some distributional features typically leads to an improvement of some aspects but to a deterioration of others. Regarding mean seasonal biases before the BC, we find only limited evidence for an added value of the higher resolution in the precipitation intensity and frequency or in the derived indicators. Thereby, evaluation results considerably depend on the RCM, season and indicator considered. High resolution simulations better reproduce the indicators’ spatial patterns, especially in terms of spatial correlation. However, this improvement is not statistically significant after applying specific BC methods. %0 journal article %@ 0921-5093 %A Suh, J.,Victoria-Hernandez, J.,Letzig, D.,Golle, R.,Volk, W. %D 2016 %J Materials Science and Engineering A %N %P 159-170 %R doi:10.1016/j.msea.2016.05.027 %T Effect of processing route on texture and cold formability of AZ31 Mg alloy sheets processed by ECAP %U https://doi.org/10.1016/j.msea.2016.05.027 %X The present work investigates the influence of different shearing patterns on mechanical and forming behavior at room temperature of equal channel angular pressing (ECAP) processed AZ31 sheets. Hot-rolled AZ31 (Mg-3Al-1Zn, wt%) sheets, with dimensions of 200×200×1.8 mm3, were processed at 225 °C with channel angle of 110° regarding processing routes A, C and D. Shear deformation induced by ECAP weakens the texture and promotes a broad angular distribution of basal planes in the pressing direction on routes A and C. Especially, processing on route D makes basal planes tilted towards the rolling direction and transverse direction by 90° rotation in the sheet plane. Due to the increased activity of basal slip, ECAP processed sheets exhibit the decrease in yield strength and r-value and increase in uniform strain and n-value in the pressing direction. As a result, route C has the largest uniform elongation in the rolling direction and route D provides a quasi-isotropic hardening behavior at room temperature. The improved formability of the ECAP processed sheets is attributed mainly to low r-value and high n-value. At Nakajima tests, route D provides higher forming limits than the as-rolled sample. The microstructure on route D exhibits a drastic reduction in the fraction of {10−12}-{10−11} double twins. This twinning mode leads to premature failure of the as-rolled sample under biaxial stretching. Consequently, microstructure-texture control induced by ECAP can enhance the cold formability of AZ31 sheets. %0 journal article %@ 1385-8947 %A Maia, F.,Yasakau, K.A.,Carneiro, J.,Kallip, S.,Tedim, J.,Henriques, T.,Cabral, A.,Venancio, J.,Zheludkevich, M.L.,Ferreira, M.G.S. %D 2016 %J Chemical Engineering Journal %N %P 1108-1117 %R doi:10.1016/j.cej.2015.07.087 %T Corrosion protection of AA2024 by sol–gel coatings modified with MBT-loaded polyurea microcapsules %U https://doi.org/10.1016/j.cej.2015.07.087 %X In this work we report the synthesis of polyurea microcapsules loaded with corrosion inhibitor 2-mercaptobenzothiazole (MBT) for corrosion protection of 2024 aluminum alloy. The microcapsules were prepared by interfacial polycondensation. The resulting capsules exhibit spherical shape, with diameter ranging between 100 nm and 2 μm. The loading content of MBT was found to be 5 wt% and release studies showed that MBT is preferentially released under acidic and alkaline conditions and follows a Fickian diffusion model. This pH dependency seems suitable for protection of metallic alloys where corrosion processes are accompanied by local pH changes. Furthermore, the microcapsules were added to a hybrid sol–gel coating and its performance assessed by electrochemical and accelerated standard tests. The results obtained indicate that capsules loaded with MBT do not affect negatively the barrier properties of sol–gel coatings, and contribute for the enhancement of adhesion of coatings to the metallic substrate. More relevant, these additives impart active corrosion protection suppressing corrosion activity at defect sites, which opens prospects for application of polyurea microcapsules as additives for high-performance coatings. %0 conference lecture (invited) %@ %A Yi, S.,Victoria-Hernandez, J.,Bohlen, J.,Kurz, G.,Letzig, D. %D 2016 %J 25th International Materials Research Congress %N %P %T Development of highly formable magnesium sheet via twin roll casting technology %U %X %0 journal article %@ 2468-0257 %A Olivieri, L.,Tena, A.,de Angelis, M.G.,Hernandez Gimenez, A.,Lozano, A.E.,Sarti, G.C. %D 2016 %J Green Energy and Environment %N 3 %P 201-210 %R doi:10.1016/j.gee.2016.09.002 %T The effect of humidity on the CO2/N2 separation performance of copolymers based on hard polyimide segments and soft polyether chains: Experimental and modeling %U https://doi.org/10.1016/j.gee.2016.09.002 3 %X In this work, we studied two copolymers formed by segments of a rubbery polyether (PPO or PEO) and of a glassy polyimide (BPDA-ODA or BKDA-ODA) suitable for gas separation and CO2 capture. Firstly, we assessed the absorption of water vapor in the materials, as a function of relative humidity (R.H.), finding that the humidity uptake of the copolymers lies between that of the corresponding pure homopolymers values. Furthermore, we studied the effect of humidity on CO2 and N2 permeability, as well as on CO2/N2 selectivity, up to R.H. of 75%. The permeability decreases with increasing humidity, while the ideal selectivity remains approximately constant in the entire range of water activity investigated. The humidity-induced decrease of permeability in the copolymers is much smaller than the one observed in polyimides such as Matrimid® confirming the positive effect of the polyether phase on the membrane performance.,Finally, we modeled the humidity-induced decrease of gas solubility, diffusivity and, consequently, permeability, using a suitable approach that considers the free volume theory for diffusion and LF model for solubility. Such model allows estimating the extent of competition that the gases undergo with water during sorption in the membranes, as a function of the relative humidity, as well as the expected reduction of free volume by means of water molecules occupation and consequent reduction of diffusivity. %0 journal article %@ 0376-7388 %A Olivieri, L.,Tena, A.,de Angelis, M.G.,Hernandez Gimenez, A.,Lozano, A.E.,Sarti, G.C. %D 2016 %J Journal of Membrane Science %N %P 187-200 %R doi:10.1016/j.memsci.2016.07.057 %T Sorption and transport of CO2 in copolymers containing soft (PEO, PPO) and hard (BKDA-ODA and BPDA-ODA) segments at different temperatures: Experimental data and modeling %U https://doi.org/10.1016/j.memsci.2016.07.057 %X In this work, we studied CO2 sorption and transport in two series of aliphatic-aromatic copolyimide membranes, as a function of chemical formulation, pressure and temperature. Such materials are formed by two distinct phases with rather different properties: the first one is formed of rubbery polyether segments (poly(propylene oxide) (PPO) or poly(ethylene oxide) (PEO)), characterized by favorable energetic interactions with CO2 and high flexibility, which endows the copolymers with high CO2 permeability, suitable for capture processes. The second phase is formed by hard glassy polyimide blocks, randomly distributed at the microscopic level, which provide the necessary thermal, chemical and mechanical stability.,Previous studies indicate that CO2 permeability increases with increasing the amount of polyether phase in the copolymers; in the present work we investigate more deeply the interactions and synergies occurring between the two phases, by focusing separately on the CO2 solubility and diffusivity terms that contribute to permeability.,In particular, by studying the shape of the solubility isotherm, as well as the values of diffusivity, sorption enthalpy and activation energy, we were able to monitor the transition from a glassy-like to a rubbery-like behavior as the fraction of rubbery component in the copolymer increases. The data indicate that polyether enhances CO2 permeability by acting mostly on diffusivity, while the solubility contribution is less affected on a quantitative basis. However, the qualitative behavior of solubility allows understanding the nature of interactions between the two phases. In particular, by using a simple additive approach to estimate the CO2 solubility of the copolymer, and the Non-Equilibrium Lattice Fluid (NELF) to evaluate the CO2 solubility in the pure homopolymers, one concludes that the copolymers sorption behavior is “ideal”, i.e. purely additive, indicating a good combination of the two phases. The copolymer volume, on the other hand, shows a contraction upon combination of the two phases. The NELF modeling of solubility data allows attributing such a contraction only to the glassy phase, whose excess free volume is reduced in the presence of the rubbery portion in the copolymer, which possibly partly occupies such excess volume, indicating a strong interpenetration of the two phases. %0 journal article %@ 0026-0665 %A Chakkedath, A.,Boehlert, C.,Hernandez, D.,Bohlen, J.,Yi, S.,Letzig, D. %D 2016 %J Advanced Materials & Processes %N 6 %P 19-21 %T In-situ EBSD technique characterizes microstructure evolution of magnesium alloy %U 6 %X An in-situ experimental technique, which involves annealing inside an scanning electron microscopy (SEM) combined with electron backscatter diffraction (EBSD) analysis, was developed to understand the microstructural evolution and recrystallization behavior of rolled ZE20 (Mg-2Zn-0.2Ce). Recrystallization started at 423-473 K. A completely recrystallized microstructure with relatively equiaxed and strain-free grains was observed at 548-573 K, and grain growth was observed afterward. Misorientation angle-axis relationship analysis for the newly formed grains reveals grain boundary formations with various twin relationships. The characterization methodology developed in this work sets the stage for future experiments to understand and control the recrystallization behavior of commercial alloys. Future work is targeted at employing this technique to understand the effect of RE content on the recrystallization behavior of Mg alloys. %0 conference lecture %@ %A Victoria-Hernandez, J.,Suh, J.,Volk, W.,Letzig, D. %D 2016 %J 25th International Materials Research Congress %N %P %T Effect of ECAP processing route on microstructure, texture and mechanical behavior of AZ31 and ZE10 Mg-alloy sheets %U %X %0 book part %@ %A Huthnance, J.,Weisse, R.,Wahl, T.,Thomas, H.,Pietrzak, J.,Souza, A.J.,Heteren, S.van,Schmelzer, N.,Beusekom, J.van,Colijn, F.,Haigh, I.,Hjoello, S.,Holfort, J.,Kent, E.C.,Kuehn, W.,Loewe, P.,Lorkowski, I.,Mork, K.A.,Paetsch, J.,Quante, M.,Salt, L.,Siddorn, J.,Smyth, T.,Sterl, A.,Woodworth, P. %D 2016 %J North Sea Region Climate Change Assessment %N %P 85-136 %R doi:10.1007/978-3-319-39745-0_3 %T Recent Change - North Sea %U https://doi.org/10.1007/978-3-319-39745-0_3 %X This chapter discusses past and ongoing change in the following physical variables within the North Sea: temperature, salinity and stratification; currents and circulation; mean sea level; and extreme sea levels. Also considered are carbon dioxide; pH and nutrients; oxygen; suspended particulate matter and turbidity; coastal erosion, sedimentation and morphology; and sea ice. The distinctive character of the Wadden Sea is addressed, with a particular focus on nutrients and sediments. This chapter covers the past 200 years and focuses on the historical development of evidence (measurements, process understanding and models), the form, duration and accuracy of the evidence available, and what the evidence shows in terms of the state and trends in the respective variables. Much work has focused on detecting long-term change in the North Sea region, either from measurements or with models. Attempts to attribute such changes to, for example, anthropogenic forcing are still missing for the North Sea. Studies are urgently needed to assess consistency between observed changes and current expectations, in order to increase the level of confidence in projections of expected future conditions. %0 journal article %@ 1759-9954 %A De Leon, A.S.,Malhotra, S.,Molina, M.,Calderon, M.,Munoz-Bonilla, A.,Rodriguez-Hernandez, J. %D 2016 %J Polymer Chemistry %N 24 %P 4112-4120 %R doi:10.1039/C6PY00601A %T Fabrication of honeycomb films from highly functional dendritic structures: electrostatic force driven immobilization of biomolecules %U https://doi.org/10.1039/C6PY00601A 24 %X Herein we report the preparation of honeycomb porous films for selective immobilization of biomolecules via the breath figure technique, a water-assisted micropatterning method. In particular, porous films are obtained from polymeric blends composed of high molecular weight polystyrene as the major component and an oligoglycerol based dendron covalently bonded to a hydrophobic polystyrene chain as the minor constituent. The multivalent dendritic architecture presents a well-defined molecular structure with controlled glycine arrays on their surfaces. Due to the mechanism of the breath figure formation, the resulting films exhibit an especial chemical distribution at the surfaces, in which the dendritic functional polymer is located preferentially in the interior of the pores while the rest of the polymer surface is mainly formed by the high molecular weight polystyrene. The high amount of amine functional groups inside the pores allowed the specific immobilization of biomolecules into the cavities by electrostatic interactions. In particular, the protein bovine serum albumin (BSA) and a DNA sequence were attached onto the films as a proof of concept. Besides, it was demonstrated that the density of biomolecules immobilized can be easily tuned by varying the content of the dendritic functional polymer in the film. These unique characteristics open new alternatives for the use of these platforms in biorelated applications including bio-recognition processes, or the understanding of cell–protein and even cell–DNA interactions on biofunctional microstructured polymeric supports. %0 conference lecture %@ %A Rodrigues, P.,Braz Fernandes, F.M.,Paula, A.S.,Oliveira, J.P.,Ribero, S.B.,Texeira, E.N.,Schell, N. %D 2016 %J 15th European Powder Diffraction Conference, EPDIC 15 %N %P %T Microstructural characterization of NiTi shape memory alloy produced by rotary hot forging %U %X %0 journal article %@ 1748-9326 %A Luterbacher, J.,Werner, J.P.,Smerdon, J.E.,Fernandez-Donado, L.,Gonzalez-Rouco, F.J.,Barriopedro, D.,Ljungqvist, F.C.,Buentgen, U.,Zorita, E.,Wagner, S.,Esper, J.,McCarroll, D.,Toreti, A.,Frank, D.,Jungclaus, J.H.,Barriendos, M.,Bertolin, C.,Bothe, O.,Brazdil, R.,Camuffo, D.,Cobrovolny, P.,Gagen, M.,Garcia-Bustamante, E.,Ge, Q.,Gomez-Navarro, J.J.,Guiot, J.,Hao, Z.,Hegerl, G.C.,Holmgren, K.Klimenko, V.V.,Martin-Chivelet, J.,Pfister, C.,Roberts, N.,Schindler, A.,Schurer, A.,Solomina, O.,Gunten, L.v.,Wahl, E.,Wanner, H.,Wetter, O.,Xoplaki, E.,Yuan, N.,Zanchettin, D.,Zhang, H.,Zerefos, C. %D 2016 %J Environmental Research Letters %N 2 %P 024001 %R doi:10.1088/1748-9326/11/2/024001 %T European summer temperatures since Roman times %U https://doi.org/10.1088/1748-9326/11/2/024001 2 %X The spatial context is critical when assessing present-day climate anomalies, attributing them to potential forcings and making statements regarding their frequency and severity in a long-term perspective. Recent international initiatives have expanded the number of high-quality proxy-records and developed new statistical reconstruction methods. These advances allow more rigorous regional past temperature reconstructions and, in turn, the possibility of evaluating climate models on policy-relevant, spatio-temporal scales. Here we provide a new proxy-based, annually-resolved, spatial reconstruction of the European summer (June–August) temperature fields back to 755 CE based on Bayesian hierarchical modelling (BHM), together with estimates of the European mean temperature variation since 138 BCE based on BHM and composite-plus-scaling (CPS). Our reconstructions compare well with independent instrumental and proxy-based temperature estimates, but suggest a larger amplitude in summer temperature variability than previously reported. Both CPS and BHM reconstructions indicate that the mean 20th century European summer temperature was not significantly different from some earlier centuries, including the 1st, 2nd, 8th and 10th centuries CE. The 1st century (in BHM also the 10th century) may even have been slightly warmer than the 20th century, but the difference is not statistically significant. Comparing each 50 yr period with the 1951–2000 period reveals a similar pattern. Recent summers, however, have been unusually warm in the context of the last two millennia and there are no 30 yr periods in either reconstruction that exceed the mean average European summer temperature of the last 3 decades (1986–2015 CE). A comparison with an ensemble of climate model simulations suggests that the reconstructed European summer temperature variability over the period 850–2000 CE reflects changes in both internal variability and external forcing on multi-decadal time-scales. For pan-European temperatures we find slightly better agreement between the reconstruction and the model simulations with high-end estimates for total solar irradiance. Temperature differences between the medieval period, the recent period and the Little Ice Age are larger in the reconstructions than the simulations. This may indicate inflated variability of the reconstructions, a lack of sensitivity and processes to changes in external forcing on the simulated European climate and/or an underestimation of internal variability on centennial and longer time scales. %0 conference lecture %@ %A Chakkedath, A.,Hernandez Escobar, D.,Bohlen, J.,Yi, S.,Letzig, D.,Boehlert, C. %D 2016 %J 145th Annual Meeting and Exhibition, TMS 2016 %N %P %T In-Situ EBSD Observations of Recrystallization and Texture Evolution in Rolled Mg-2Zn-xCe (wt.%) %U %X %0 conference paper %@ %A Chakkedath, A.,Hernandez Escobar, D.,Bohlen, J.,Yi, S.,Letzig, D.,Boehlert, C. %D 2016 %J Magnesium Technology 2016, TMS 2016 Supplemental Proceedings, 145th Annual Meeting and Exhibition, TMS 2016 %N %P 237-238 %R doi:10.1002/9781119274803.ch47 %T In-Situ EBSD Observations of Recrystallization and Texture Evolution in Rolled Mg-2Zn-xCe (wt.%) %U https://doi.org/10.1002/9781119274803.ch47 %X This chapter indicates that wrought magnesium (Mg) alloys are attractive for automotive applications where light weighting is critical. For electron backscatter diffraction (EBSD) analysis, ∼10 mm wide and ∼15 mm long samples were cut from the sheet material using a diamond saw. One of the sample surfaces was mechanically polished and then electropolished using a mixture of 30% Nitric acid and 70% Methanol as electrolyte. EBSD analysis was performed while the sample was kept at a desired temperature. A thermocouple was spot welded to the sample surface to monitor the temperature. Both as‐rolled materials exhibited a basal texture in which the c‐axis tends to align perpendicular to the rolling direction. Grain boundaries with orientation relationships corresponding to {10 2} extension twinning (86° about <11 0>), {10 1} contraction twinning (56° about <11 0>), and (10 2)‐(01 2) extension double twin (60° about <10 0>) were observed. This was expected to be due to the recovery and growth of the twins formed during the rolling process. %0 journal article %@ 0167-577X %A Oliveira, J.P.,Braz Fernandes, F.M.,Schell, N.,Miranda, R.M. %D 2016 %J Materials Letters %N %P 273-276 %R doi:10.1016/j.matlet.2016.02.107 %T Martensite stabilization during superelastic cycling of laser welded NiTi plates %U https://doi.org/10.1016/j.matlet.2016.02.107 %X Superelastic behavior of laser welded NiTi is significantly different from the original base material due to microstructural changes introduced during welding. These are responsible for a higher accumulated irrecoverable strain during mechanical cycling. In order to clarify the mechanisms responsible for the evolution of the accumulated irrecoverable strain on superelastic laser welded NiTi, detailed synchrotron X-ray diffraction analysis was performed. Welded samples were analyzed as-welded, after 4 cycles at 10% strain and after 600 cycles at 10% strain. As-welded sample had thermally stabilized martensite in the heat affected and fusion zones due to the welding procedure. It was observed that after 4 cycles, stabilization of the stress induced martensite occurred in a massive way in the thermal affected regions, due to the introduction of defects which prevented the reverse transformation upon unloading. After 600 cycles no significant changes were observed in the thermal affected regions. However, evidence of martensite stabilization in the base material, which was originally fully austenitic, near the heat affected zone was observed. %0 journal article %@ 0261-3069 %A Oliveira, J.P.,Braz Fernandes, F.M.,Miranda, R.M.,Schell, N.,Ocana, J.L. %D 2016 %J Materials and Design %N %P 180-187 %R doi:10.1016/j.matdes.2016.03.137 %T Residual stress analysis in laser welded NiTi sheets using synchrotron X-ray diffraction %U https://doi.org/10.1016/j.matdes.2016.03.137 %X Synchrotron radiation was used for fine probing the different regions of a laser welded NiTi joint. Measurements were taken at 0.2 mm intervals, starting in the non-thermal affected material, through the heat affected zone, the fusion zone and again across the heat affected zone finishing in the base material. Along the longitudinal direction the residual stresses were found to be always tensile in the heat affected and fusion zones; along the transversal direction, an inversion of the stress states was found. The magnitude of the residual stresses was found to be more significant in the transversal direction due to constraints imposed during welding. The heat introduced during welding has a stress relief effect on the cold-rolled base material, although it does not promote any solid-state transformation. The effect of the heat input on the residual stress pattern and magnitude was identified and it was seen that high heat input leads to a higher magnitude of the residual stresses in the weld and the stress relief effect is observed over a larger extension from the weld centerline. This paper presents the first experimental study on the determination of residual stresses on laser welded NiTi shape memory alloys. %0 journal article %@ 2405-8807 %A Hurk, B.J.J.M.van den,Bouwer, L.M.,Buontempo, C.,Doescher, R.,Ercin, E.,Hananel, C.,Hunink, J.E.,Kjellstroem, E.,Klein, B.,Manez, M.,Pappenberger, F.,Pouget, L.,Ramos, M.-H.,Ward, P.J.,Weerts, A.H.,Wijngaard, J.B. %D 2016 %J Climate Services %N %P 6-11 %R doi:10.1016/j.cliser.2016.01.001 %T Improving predictions and management of hydrological extremes through climate services: www.imprex.eu %U https://doi.org/10.1016/j.cliser.2016.01.001 %X The EU Roadmap on climate services can be seen as a result of a convergence between the society's call for “actionable research”, and the ability of the climate research community to provide tailored data, information and knowledge. However, although weather and climate have clearly distinct definitions, a strong link between weather and climate services exists that is not explored extensively. Stakeholders being interviewed in the context of the Roadmap consider climate as a far distant long term feature that is difficult to incorporate in present-day decision taking, which is dominated by daily experience with handling extreme events. In this paper we argue that this experience is a rich source of inspiration to increase society's resilience to an unknown future.,A newly started European research project, IMPREX, is built on the notion that “experience in managing current day weather extremes is the best learning school to anticipate consequences of future climate”. This paper illustrates possible ways to increase the link between information and services for the water sector, by addressing weather and climate time scales and discussing the underlying concepts of IMPREX and its expected outcome. %0 journal article %@ 0142-1123 %A Oliveira, J.P.,Miranda, R.M.,Schell, N.,Braz Fernandes, F.M. %D 2016 %J International Journal of Fatigue %N 2 %P 195-200 %R doi:10.1016/j.ijfatigue.2015.10.013 %T High strain and long duration cycling behavior of laser welded NiTi sheets %U https://doi.org/10.1016/j.ijfatigue.2015.10.013 2 %X The use of NiTi in complex shaped components for structural applications is limited by the material cost and machinability and adequate joining techniques have been investigated to minimize the thermal cycle effect on the superelastic and shape memory effects exhibited by NiTi. Laser welding is the most used joining process for this material. However, existing studies mainly address the functional properties of laser welded NiTi wires, and the superelastic cycling tests are limited to either a low number of cycles (maximum 100) or to low strains (below 6%). This paper discusses the results of the cycling behavior exhibited by laser butt welded 1 mm thick NiTi plates, when tested to high strains (up to 10%) and for a large number of cycles (600). The superelastic effect was observed and the microstructural changes induced by the laser welding procedure, namely the extension of the thermal affected regions, were seen to influence the evolution of the accumulated irrecoverable strain. Thus, it is possible, by controlling the heat input introduced during welding, to tune the maximum superelastic recovery presented by NiTi laser welds. %0 journal article %@ 0921-5093 %A Suh, J.,Victoria-Hernandez, J.,Letzig, D.,Golle, R.,Volk, W. %D 2016 %J Materials Science and Engineering A %N %P 523-529 %R doi:10.1016/j.msea.2015.09.058 %T Enhanced mechanical behavior and reduced mechanical anisotropy of AZ31 Mg alloy sheet processed by ECAP %U https://doi.org/10.1016/j.msea.2015.09.058 %X AZ31 Mg alloy sheets were processed by equal channel angular pressing (ECAP) at 225 °C with a channel angle of 110° regarding a strain path change. In consideration of mechanical anisotropy of Mg sheets, the sheet was processed by ECAP along the rolling direction in the first pass. Subsequently, it was processed along the transverse direction by 90° rotation in the sheet plane. This shear deformation led to grain refinement and developed basal texture with tilted basal planes towards the pressing direction. The presented processing route, which is denoted as route D, reduced mechanical anisotropy and enhanced hardening behavior. Consequently, AZ31 sheet, which was processed by ECAP on route D, exhibited an almost isotropic hardening at room temperature with improved ductility. %0 journal article %@ 1463-9076 %A Vispa, A.,Busch, S.,Tamarit, J.L.,Unruh, T.,Fernandez-Alonso, F.,Pardo, L.C. %D 2016 %J Physical Chemistry Chemical Physics %N 5 %P 3975-3981 %R doi:10.1039/C5CP05143F %T A robust comparison of dynamical scenarios in a glass-forming liquid %U https://doi.org/10.1039/C5CP05143F 5 %X We use Bayesian inference methods to provide fresh insights into the sub-nanosecond dynamics of glycerol, a prototypical glass-forming liquid. To this end, quasielastic neutron scattering data as a function of temperature have been analyzed using a minimal set of underlying physical assumptions. On the basis of this analysis, we establish the unambiguous presence of three distinct dynamical processes in glycerol, namely, translational diffusion of the molecular centre of mass and two additional localized and temperature-independent modes. The neutron data also provide access to the characteristic length scales associated with these motions in a model-independent manner, from which we conclude that the faster (slower) localized motions probe longer (shorter) length scales. Careful Bayesian analysis of the entire scattering law favors a heterogeneous scenario for the microscopic dynamics of glycerol, where molecules undergo either the faster and longer or the slower and shorter localized motions. %0 journal article %@ 1044-5803 %A Victoria-Hernandez, J.,Suh, J.,Yi, S.,Bohlen, J.,Volk, W.,Letzig, D. %D 2016 %J Materials Characterization %N %P 98-107 %R doi:10.1016/j.matchar.2016.01.002 %T Strain-induced selective grain growth in AZ31 Mg alloy sheet deformed by equal channel angular pressing %U https://doi.org/10.1016/j.matchar.2016.01.002 %X In this work the microstructure development during annealing of AZ31 sheets processed by equal channel angular pressing (ECAP) is presented. Samples with dimensions of 200 × 200 × 1.8 mm3 were processed in a single ECAP pass at 225 °C using a channel angle of 130°. Subsequent isothermal and isochronal heat treatments were used to reveal the microstructure stability of the ECAPed sheets at temperatures between 180 and 300 °C. A systematic analysis of the microstructure development was conducted using optical microscopy and electron backscatter diffraction (EBSD). It was found that a texture modification produced by the profuse activation of View the MathML source101-2 extension twinning during ECAP is lost during annealing as a result of thermal detwinning. Moreover, a bimodal microstructure composed by small and coarse grains was observed at 250 °C and 300 °C as a result of the fast growth of a few grains. The reason for the selective grain growth is related with the activation of strain induced grain boundary migration which was stimulated by the large stored strain contained in the as-ECAP processed sheets. The dissolution of Mg17Al12 particles during annealing is also seen as a possible factor for the onset of rapid grain growth. %0 journal article %@ 0930-7575 %A Dorado-Linan, I.,Sanchez-Lorenzo, A.,Gutierrez Merino, E.,Planells, O.,Heinrich, I.,Helle, G.,Zorita, E. %D 2016 %J Climate Dynamics %N 3 %P 937-950 %R doi:10.1007/s00382-015-2881-x %T Changes in surface solar radiation in Northeastern Spain over the past six centuries recorded by tree-ring Delta13C %U https://doi.org/10.1007/s00382-015-2881-x 3 %X Although solar radiation at the surface plays a determinant role in carbon discrimination in tree rings, stable carbon isotope chronologies (δ13C) have often been interpreted as a temperature proxy due to the co-variability of temperature and surface solar radiation. Furthermore, even when surface solar radiation is assumed to be the main driver of 13C discrimination in tree rings, δ13C records have been calibrated against sunshine duration or cloud cover series for which longer observational records exists. In this study, we use different instrumental and satellite data over northeast Spain (southern Europe) to identify the main driver of tree-ring 13C discrimination in this region. Special attention is paid to periods in which the co-variability of those climate variables may have been weaker, such as years after large volcanic eruptions. The analysis identified surface solar radiation as the main driver of tree-ring δ13C changes in this region, although the influence of other climatic factors may not be negligible. Accordingly, we suggest that a reconstruction of SSR over the last 600 years is possible. The relation between multidecadal variations of an independent temperature reconstruction and surface solar radiation in this region shows no clear sign, and warmer (colder) periods may be accompanied by both higher and lower surface solar radiation. However, our reconstructed records of surface solar radiation reveals a sunnier Little Ice Age in agreement with other δ13C tree-ring series used to reconstruct sunshine duration in central and northern Europe. %0 journal article %@ 1991-959X %A Naudts, K.,Ryder, J.,McGrath, M.J.,Otto, J.,Chen, Y.,Valade, A.,Bellasen, V.,Berhongaray, G.,Boenisch, G.,Campioli, M.,Ghattas, J.,De Groote, T.,Haverd, V.,Kattge, J.,MacBean, N.,Maignan, F.,Merilae, P.,Penuelas, J.,Peylin, P.,Pinty, B.,Pretzsch, H.,Schulze, E.D.,Solyga, D.,Vuichardt, N.,Yan, Y.,Luyssaert, S. %D 2015 %J Geoscientific Model Development %N 7 %P 2035-2065 %R doi:10.5194/gmd-8-2035-2015 %T A vertically discretised canopy description for ORCHIDEE (SVN r2290) and the modifications to the energy, water and carbon fluxes %U https://doi.org/10.5194/gmd-8-2035-2015 7 %X Since 70 % of global forests are managed and forests impact the global carbon cycle and the energy exchange with the overlying atmosphere, forest management has the potential to mitigate climate change. Yet, none of the land-surface models used in Earth system models, and therefore none of today's predictions of future climate, accounts for the interactions between climate and forest management. We addressed this gap in modelling capability by developing and parametrising a version of the ORCHIDEE land-surface model to simulate the biogeochemical and biophysical effects of forest management. The most significant changes between the new branch called ORCHIDEE-CAN (SVN r2290) and the trunk version of ORCHIDEE (SVN r2243) are the allometric-based allocation of carbon to leaf, root, wood, fruit and reserve pools; the transmittance, absorbance and reflectance of radiation within the canopy; and the vertical discretisation of the energy budget calculations. In addition, conceptual changes were introduced towards a better process representation for the interaction of radiation with snow, the hydraulic architecture of plants, the representation of forest management and a numerical solution for the photosynthesis formalism of Farquhar, von Caemmerer and Berry. For consistency reasons, these changes were extensively linked throughout the code. Parametrisation was revisited after introducing 12 new parameter sets that represent specific tree species or genera rather than a group of often distantly related or even unrelated species, as is the case in widely used plant functional types. Performance of the new model was compared against the trunk and validated against independent spatially explicit data for basal area, tree height, canopy structure, gross primary production (GPP), albedo and evapotranspiration over Europe. For all tested variables, ORCHIDEE-CAN outperformed the trunk regarding its ability to reproduce large-scale spatial patterns as well as their inter-annual variability over Europe. Depending on the data stream, ORCHIDEE-CAN had a 67 to 92 % chance to reproduce the spatial and temporal variability of the validation data. %0 conference lecture %@ %A Bohlen, J.,Yi, S.,Victoria-Hernandez, J.,Schell, N.,Schwebke, B.,Brokmeier, H.-G.,Kurz, G.,Letzig, D. %D 2015 %J 144th Annual Meeting & Exhibition, TMS 2015 - Magnesium Technology %N %P %T The microstructure and texture development during twin-roll casting and rolling of magnesium alloy AZ31 %U %X %0 book part %@ %A Blawert, C.,Sah, S.P.,Scharnagl, N.,Kannan, M.B. %D 2015 %J Surface Modification of Magnesium and its Alloys for Biomedical Applications, Modification and Coating Techniques %N %P 193-234 %R doi:10.1016/B978-1-78242-078-1.00008-6 %T Plasma electrolytic oxidation/Microarc oxidation of magnesium and its alloys %U https://doi.org/10.1016/B978-1-78242-078-1.00008-6 %X The plasma electrolytic oxidation (PEO) process which converts the surface of magnesium alloys into a hard ceramic like topcoat has been found to be capable of providing an enhanced wear and corrosion resistance. By changing the process parameters e.g. electrolyte composition, current density, duration etc. a wide variety of coatings can be produced and adapted to applications ranging from automotive to medical. However, latter applications are still limited. The present chapter will provide a state-of-the-art overview of PEO processing for magnesium biomedical applications including processing parameters, coating compositions and properties. %0 conference paper %@ %A Letzig, D.,Suh, J.,Yi, S.,Bohlen, J.,Kurz, G.,Golle, R.,Volk, W.,Victoria-Hernandez, J. %D 2015 %J Proceedings of 10th International Conference on Magnesium Alloys and Their Applications, Mg 2015 %N %P 644-650 %T Properties of Mg-3Al-1Zn alloy sheets processed by Equal Channel Angular Pressing %U %X A combination of new technologies could help to alleviate the strong textures formed in Mg,sheets. Techniques which apply additional shear strain such as differential speed rolling (DSR) and/or equal channel angular pressing (ECAP) can offer a distinct possibility to reduce the grain size of the material and generate unique textures. In this work the microstructure, texture development and mechanical properties of Mg-3Al-1Zn alloy sheets processed by Equal Channel Angular Pressing,(ECAP) were investigated.,An AZ31 strip produced by twin roll casting was hot rolled at 400 °C using a rolling speed of 10,m/min. ECAP process was employed to deform sheets with dimension of,200 mm × 200 mm × 1.8 mm3. ECAP trials were carried out successfully at different temperatures up to 200 °C. The effect of the ECAP process on the developing microstructure and texture as well as the related mechanical properties will be shown. The sheets experienced a shear deformation by the ECAP,show a lower normal anisotropy, r-value, than the conventionally rolled sheet. Moreover, the deep,drawability at room temperature is improved by over 50 % after the ECAP process, in comparison of,conventionally rolled sheet. The ECAP process is therefore an effective thermo-mechanical process,for the improvement of the cold formability of Mg sheets, by means of the microstructure and texture,control. %0 conference lecture %@ %A Letzig, D.,Suh, J.,Yi, S.,Bohlen, J.,Kurz, G.,Golle, R.,Volk, W.,Victoria-Hernandez, J. %D 2015 %J 10th International Conference on Magnesium Alloys and Their Applications, Mg 2015 %N %P %T Properties of Mg-3Al-1Zn alloy sheets processed by Equal Channel Angular Pressing %U %X %0 conference lecture %@ %A Bohlen, J.,Yi, S.,Victoria-Hernandez, J.,Kurz, G.,Letzig, D.,Kainer, K.U. %D 2015 %J 10th International Conference on Magnesium Alloys and Their Applications, Mg 2015 %N %P %T The influence of the combination of alloying elements on the microstructure and texture development during rolling and annealing of magnesium %U %X %0 journal article %@ 0924-0136 %A Suh, J.,Victoria-Hernandez, J.,Letzig, D.,Golle, R.,Yi, S.,Bohlen, J.,Volk, W. %D 2015 %J Journal of Materials Processing Technology %N %P 286-293 %R doi:10.1016/j.jmatprotec.2014.11.029 %T Improvement in cold formability of AZ31 magnesium alloy sheets processed by equal channel angular pressing %U https://doi.org/10.1016/j.jmatprotec.2014.11.029 %X The microstructure, texture development and mechanical properties of AZ31 magnesium alloy sheets processed by equal channel angular pressing (ECAP) were investigated in this work. The results were correlated with the forming behavior at room temperature after single ECAP pass at different processing temperatures. A novel tool was developed for the implementation of ECAP to deform sheets with dimension of 200 × 200 × 1.8 mm3. ECAP trials were carried out successfully at three temperatures of 175, 200 and 225 °C using a channel angle of 130°. After the ECAP process, significant grain refinement and texture changes occurred in the AZ31 sheets. In particular, dynamic recrystallization was observed in the ECAPed sheets at 225 °C. The tensile tests at room temperature showed that uniform elongation along the pressing direction (PD) increased with increasing processing temperature. The highest uniform strain at room temperature was 17.6% in the ECAPed sheet at 225 °C. Forming tests of a U-channel section at room temperature revealed that the drawing depth of the ECAPed sheet at 225 °C was improved by more than 50% as compared with the as-rolled condition. %0 journal article %@ 2249-0205 %A Jahnke, B.,Frank, C.,Fernandez, J.F.,Niemeyer, B. %D 2015 %J American Chemical Science Journal %N 2 %P 163-173 %R doi:10.9734/ACSj/2015/13089 %T A Sequential Injection Analysis Method for the Determination of Glyphosate and Aminomethylphosphonic Acid in Water Samples %U https://doi.org/10.9734/ACSj/2015/13089 2 %X A conventional laboratory method for the determination of glyphosate and its degradation product aminomethylphosphonic acid (AMPA) is high performance liquid chromatography (HPLC) followed by post column derivatization with o-phthaldialdehyde (OPA). However, AMPA is partly decomposed in the process causing a deviation in the AMPA detection or even making a simultaneous detection of glyphosate and AMPA with the described postcolumn procedure impossible. We used a compact sequential injection analysis system and optimized the process conditions for both analytes independently from each other. The process conditions were adjusted to the different chemical characteristics of AMPA (primary amine) and glyphosate (secondary amine), which needs to be oxidized to a primary amine prior to the derivatization. An ion exchange column was included in the system to eliminate amines interfering with the method. Limits of detection of 16 and 9 µg L-1 for glyphosate and AMPA, respectively are similar to those achieved with HPLC methods reported in literature, but compared to conventional HPLC methods only small amounts of reagents are consumed. %0 conference paper %@ %A Bohlen, J.,Yi, S.,Victoria-Hernandez, J.,Schell, N.,Schwebke, B.,Brokmeier, H.-G.,Kurz, G.,Letzig, D. %D 2015 %J Collected Proceedings, 144th Annual Meeting & Exhibition, TMS 2015 - Magnesium Technology 2015 %N %P 471-478 %T The microstructure and texture development during twin-roll casting and rolling of magnesium alloy AZ31 %U %X %0 journal article %@ 1991-959X %A Katragkou, E.,Garcia-Diez, M.,Vautard, R.,Sobolowski, S.,Zanis, P.,Alexandri, G.,Cardoso, R.M.,Colette, A.,Fernandez, J.,Gobiet, A.,Goergen, K.,Karacostas, T.,Knist, S.,Mayer, S.,Soares, P.M.M.,Pytharoulis, I.,Tegoulias, I.,Tsikerdekis, A.,Jacob, D. %D 2015 %J Geoscientific Model Development %N 3 %P 603-618 %R doi:10.5194/gmd-8-603-2015 %T Regional climate hindcast simulations within EURO-CORDEX: evaluation of a WRF multi-physics ensemble %U https://doi.org/10.5194/gmd-8-603-2015 3 %X In the current work we present six hindcast WRF (Weather Research and Forecasting model) simulations for the EURO-CORDEX (European Coordinated Regional Climate,Downscaling Experiment) domain with different configurations,in microphysics, convection and radiation for the time period 1990–2008. All regional model simulations are forced by the ERA-Interim reanalysis and have the same,spatial resolution (0.44). These simulations are evaluated for surface temperature, precipitation, short- and longwave downward radiation at the surface and total cloud cover.,The analysis of the WRF ensemble indicates systematic temperature,and precipitation biases, which are linked to different physical mechanisms in the summer and winter seasons. Overestimation of total cloud cover and underestimation of downward shortwave radiation at the surface, mostly linked to the Grell–Devenyi convection and CAM (Community,Atmosphere Model) radiation schemes, intensifies the negative bias in summer temperatures over northern Europe (max -2.5 C). Conversely, a strong positive bias in downward shortwave radiation in summer over central (40–60 %) and southern Europe mitigates the systematic cold bias over these regions, signifying a typical case of error compensation.,Maximum winter cold biases are over northeastern Europe (-2.8 C); this location suggests that land–atmosphere rather than cloud–radiation interactions are to blame. Precipitation is overestimated in summer by all model configurations, especially the higher quantiles which are associated with summertime deep cumulus convection. The largest precipitation biases are produced by the Kain–Fritsch convection scheme over the Mediterranean. Precipitation biases in winter are lower than those for summer in all model configurations (15–30 %). The results of this study indicate the importance of evaluating not only the basic climatic parameters of interest for climate change applications (temperature and precipitation), but also other components of the energy and water cycle, in order to identify the sources of systematic biases, possible compensatory or masking mechanisms and suggest pathways for model improvement. %0 journal article %@ 1708-3087 %A Potts, T.,O'Higgins, T.,Brennan, R.,Cinnirella, S.,Steiner Brandt, U.,De Vivero, J.,van Beusekom, J.,Troost, T.,Paltriguera, L.,Hosgor, A. %D 2015 %J Ecology and Society %N 1 %P 29 %R doi:10.5751/ES-07280-200129 %T Detecting critical choke points for achieving Good Environmental Status in European seas %U https://doi.org/10.5751/ES-07280-200129 1 %X Choke points are social, cultural, political, institutional, or psychological obstructions of social-ecological systems that constrain progress toward an environmental objective. Using a soft systems methodology, different types of chokes points were identified in the Outer Hebrides of Scotland, the Baltic, and the North and Mediterranean seas. The choke points were of differing types: cultural and political choke points were identified in Barra and the Mediterranean, respectively, whereas the choke points in the North Sea and Baltic Sea were dependent on differing values toward the mitigation of eutrophication. We conclude with suggestions to identify and address choke points. %0 journal article %@ 1793-6047 %A Oliveira, J.P.,Braz Fernandes, F.M.,Schell, N.,Miranda, R.M. %D 2015 %J Functional Materials Letters : FML %N 6 %P 1550069 %R doi:10.1142/S1793604715500691 %T Shape memory effect of laser welded NiTi plates %U https://doi.org/10.1142/S1793604715500691 6 %X Laser welding is a suitable joining technique for shape memory alloys (SMAs). This paper reports the existence of shape memory effect (SME) on laser welded NiTi joints, subjected to bending tests, and correlates this effect with the microstructural analysis performed with X-ray diffraction (XRD). All welded samples were able to recover their initial shape after bending to 180°, which is a remarkable result for industrial applications of NiTi involving laser welding. %0 journal article %@ 1814-9324 %A Fernandez Donado, L.,Gonzalez-Rouco, J.F.,Garcia Bustamante, E.,Goosse, H.,Jungclaus, J.,Bothe, O.,Hegerl, G.,Moberg, A.,Raible, C.C.,Schurer, A.,Wagner, S.,Zorita, E.,Hind, A.,Lehner, F.,McKay, N.,Warren, E.,Widmann, M. %D 2015 %J Climate of the Past %N 12 %P 1673-1699 %R doi:10.5194/cp-11-1673-2015 %T Continental-scale temperature variability in PMIP3 simulations and PAGES 2k regional temperature reconstructions over the past millennium %U https://doi.org/10.5194/cp-11-1673-2015 12 %X Estimated external radiative forcings, model results, and proxy-based climate reconstructions have been used over the past several decades to improve our understanding of the mechanisms underlying observed climate variability and change over the past millennium. Here, the recent set of temperature reconstructions at the continental-scale generated by the PAGES 2k project and a collection of state-of-the-art model simulations driven by realistic external forcings are jointly analysed. The first aim is to estimate the consistency between model results and reconstructions for each continental-scale region over the time and frequency domains. Secondly, the links between regions are investigated to determine whether reconstructed global-scale covariability patterns are similar to those identified in model simulations. The third aim is to assess the role of external forcings in the observed temperature variations. From a large set of analyses, we conclude that models are in relatively good agreement with temperature reconstructions for Northern Hemisphere regions, particularly in the Arctic. This is likely due to the relatively large amplitude of the externally forced response across northern and high-latitude regions, which results in a clearly detectable signature in both reconstructions and simulations. Conversely, models disagree strongly with the reconstructions in the Southern Hemisphere. Furthermore, the simulations are more regionally coherent than the reconstructions, perhaps due to an underestimation of the magnitude of internal variability in models or to an overestimation of the response to the external forcing in the Southern Hemisphere. Part of the disagreement might also reflect large uncertainties in the reconstructions, specifically in some Southern Hemisphere regions, which are based on fewer palaeoclimate records than in the Northern Hemisphere. %0 journal article %@ 0885-3282 %A Ivashchenko, S.,Escobar Ivirico, J.L.,Garcia Cruz, D.M.,Campillo-Fernandez, A.,Gallego Ferrer, G.,Monleon Pradas, M. %D 2015 %J Journal of Biomaterials Applications %N 8 %P 1096-1108 %R doi:10.1177/0885328214554816 %T Bioactive organic–inorganic poly(CLMA-co-HEA)/silica nanocomposites %U https://doi.org/10.1177/0885328214554816 8 %X A series of novel poly(CLMA-co-HEA)/silica nanocomposites is synthesized from caprolactone 2-(methacryloyloxy)ethyl ester (CLMA) and 2-hydroxyethyl acrylate (HEA) as organic comonomers and the simultaneous sol-gel polymerization of tetraethyloxysilane (TEOS) as silica precursor, in different mass ratios up to a 30 wt% of silica. The nanocomposites are characterized as to their mechanical and thermal properties, water sorption, bioactivity and biocompatibility, reflecting the effect on the organic matrix provided by the silica network formation. The nanocomposites nucleate the growth of hydroxyapatite (HAp) on their surfaces when immersed in the simulated body fluid of the composition used in this work. Proliferation of the MC3T3 osteoblast-like cells on the materials was assessed with the MTS assay showing their biocompatibility. Immunocytochemistry reveals osteocalcin and type I collagen production, indicating that osteoblast differentiation was promoted by the materials, and calcium deposition was confirmed by von Kossa staining. The results indicate that these poly(CLMA-co-HEA)/silica nanocomposites could be a promising biomaterial for bone tissue engineering. %0 conference lecture %@ %A Braz-Fernandes, F.M.,Oliveira, J.P.,Machado, A.M.,Alves, A.R.,Schell, N. %D 2015 %J European Symposium on Martensitic Transformations, ESOMAT 2015 %N %P %T Effect of heat treatment on K3, K3XF and MTwo endodontic files %U %X %0 conference paper %@ 2261-236X %A Braz-Fernandes, F.M.,Oliveira, J.P.,Machado, A.M.,Alves, A.R.,Schell, N. %D 2015 %J MATEC Web of Conferences %N %P 03016 %R doi:10.1051/matecconf/20153303016 %T Effect of heat treatment on K3, K3XF and MTwo endodontic files %U https://doi.org/10.1051/matecconf/20153303016 %X The purpose of this study was to evaluate the effect of heat treatment on the transformation temperatures of K3, K3XF and MTwo endodontic files. DSC was used to investigate the domains of transformation temperatures and how the transformation temperatures vary along the file. The files were analysed as received and subjected to heat treatment. X-ray diffraction analysis was also used to investigate the stress-induced martensite transformation on the files under flexion. The results show that heat treatment influences the transformation temperatures and that under flexion, the conditions and situations in which files present a stress-induced martensite transformation can be identified. %0 journal article %@ 0010-938X %A Oliveira, A.B.,Bastos, A.C.,Fernandes, C.M.,Pinho, C.M.S.,Senos, A.M.R.,Soares, E.,Sacramento, J.,Zheludkevich, M.L.,Ferreira, M.G.S. %D 2015 %J Corrosion Science %N %P 322-331 %R doi:10.1016/j.corsci.2015.08.006 %T Corrosion behaviour of WC-10% AISI 304 cemented carbides %U https://doi.org/10.1016/j.corsci.2015.08.006 %X The corrosion behavior of tungsten carbide hard metal composites with AISI 304L stainless steel as binder matrix and a WC–Co composite with similar grain size and binder content was investigated using electrochemical techniques (open circuit potential monitoring, current-potential curves, electrochemical impedance spectroscopy, scanning vibrating electrode technique) and scanning electron microscopy. %0 journal article %@ 0003-2700 %A Silva, E.L.,Gouvea, C.P.,Quevedo, M.C.,Neto, M.A.,Archanjo, B.S.,Fernandes, A.J.S.,Achete, C.A.,Silva, R.F.,Zheludkevich, M.L.,Oliveira, F.J. %D 2015 %J Analytical Chemistry %N 13 %P 6487-6492 %R doi:10.1021/acs.analchem.5b00756 %T All-Diamond Microelectrodes as Solid State Probes for Localized Electrochemical Sensing %U https://doi.org/10.1021/acs.analchem.5b00756 13 %X The fabrication of an all-diamond microprobe is demonstrated for the first time. This ME (microelectrode) assembly consists of an inner boron doped diamond (BDD) layer and an outer undoped diamond layer. Both layers were grown on a sharp tungsten tip by chemical vapor deposition (CVD) in a stepwise manner within a single deposition run. BDD is a material with proven potential as an electrochemical sensor. Undoped CVD diamond is an insulating material with superior chemical stability in comparison to conventional insulators. Focused ion beam (FIB) cutting of the apex of the ME was used to expose an electroactive BDD disk. By cyclic voltammetry, the redox reaction of ferrocenemethanol was shown to take place at the BDD microdisk surface. In order to ensure that the outer layer was nonelectrically conductive, a diffusion barrier for boron atoms was established seeking the formation of boron–hydrogen complexes at the interface between the doped and the undoped diamond layers. The applicability of the microelectrodes in localized corrosion was demonstrated by scanning amperometric measurements of oxygen distribution above an Al–Cu–CFRP (Carbon Fiber Reinforced Polymer) galvanic corrosion cell. %0 journal article %@ 1385-8947 %A Maia, F.,Silva, A.P.,Fernandes, S.,Cunha, A.,Almeida, A.,Tedim, J.,Zheludkevich, M.L.,Ferreira, M.G.S. %D 2015 %J Chemical Engineering Journal %N %P 150-157 %R doi:10.1016/j.cej.2015.01.076 %T Incorporation of biocides in nanocapsules for protective coatings used in maritime applications %U https://doi.org/10.1016/j.cej.2015.01.076 %X This work reports the synthesis and characterization of silica nanocapsules with biologically-active compounds 2-mercaptobenzothiazole and 4,5-dichloro-2-octyl-4-isothiazolin-3-one. The resulting particles were characterized by scanning electron microscopy, thermogravimetry and adsorption–desorption isotherms of N2. The antibacterial activity was assessed for both nanocapsules dispersed in solution as well as incorporated in coating systems, using a recombinant bioluminescent Escherichia coli expressing the luxCDABE genes from the marine bioluminescent bacterium Aliivibrio fischeri. The decrease in light emission of the bacterial model, indicative as decrease of metabolic activity, was directly correlated with the level of biocide detected in solution by UV–Visible spectrophotometry. The results show that the developed nanomaterials show great potential for application in antifouling coatings. %0 conference paper %@ %A Bohlen, J.,Yi, S.,Victoria-Hernandez, J.,Kurz, G.,Letzig, D.,Kainer, K.U. %D 2015 %J Proceedings of 10th International Conference on Magnesium Alloys and Their Applications, Mg 2015 %N %P 625-636 %T The influence of the combination of alloying elements on the microstructure and texture development during rolling and annealing of magnesium %U %X Mechanical properties and formability of magnesium sheets are distinctly influenced by the microstructure and texture of the sheet. It has been shown that alloys which contain rare earth (RE) elements, Ca or other alloying,elements can lead to significantly weaker textures in binary alloys or even qualitatively different textures in ternary modifications with zinc if compared to conventional magnesium alloy sheets, e.g. of alloy AZ31. In this paper the effect of a single addition of a RE element Ce is reviewed and compared to ternary variations with Zn with respect to the microstructure and texture development during rolling and annealing of the sheets.,Qualitative differences in the mechanisms that determine the microstructure and texture development are addressed. Furthermore, a variation in the formation of different texture components due to alloying with Ca or Mn is analyzed. %0 journal article %@ 1359-6454 %A Esin, V.A.,Denand, B.,Le Bihan, Q.,Dehmas, M.,Teixeira, J.,Geandier, G.,Denis, S.,Sourmail, T.,Aeby-Gautier, E. %D 2014 %J Acta Materialia %N %P 118-131 %R doi:10.1016/j.actamat.2014.07.042 %T In situ synchrotron X-ray diffraction and dilatometric study of austenite formation in a multi-component steel: Influence of initial microstructure and heating rate %U https://doi.org/10.1016/j.actamat.2014.07.042 %X The formation of austenite during both slow and fast heating (0.25–100 °C s−1) was investigated for different microstructures of a selected low-alloy steel. With the simultaneous use of dilatometry and high-energy X-ray diffraction, it was possible to follow not only the global progress of the austenitization, but also the individual evolutions of each phase (ferrite, cementite and retained austenite if present in the initial microstructure). The results confirm earlier published data regarding the ease of austenitization of different initial microstructures (ferrite–pearlite, bainite and tempered martensite). More importantly, two stages were clearly identified, corresponding to the simultaneous transformation of ferrite and cementite, followed by the progressive disappearance of the remaining ferrite. While this is well known for ferrite–pearlite microstructures, it is not yet documented for bainite and tempered martensite. Microstructure evolution calculations based on a diffusion-controlled mechanism helped rationalize the differences observed between the three initial microstructures. In addition, they also strongly suggested the existence of a critical carbide size beyond which the second austenitization phase would correspond to carbide dissolution instead of ferrite transformation. %0 conference lecture %@ %A Victoria-Hernandez, J.,Suh, J.,Bohlen, J.,Yi, S.,Golle, R.,Volk, W.,Letzig, D. %D 2014 %J 21st International Symposium on Metastable, Amorphous and Nanostructured Materials, ISMANAM 2014 %N %P %T Microstructural Stability Analysis of Mg-3Al-1Zn Sheets Deformed by Equal Channel Angular Pressing %U %X %0 conference lecture (invited) %@ %A Letzig, D.,Suh, J.,Bohlen, J.,Yi, S.,Kurz, G.,Golle, R.,Volk, W.,Victoria-Hernandez, J. %D 2014 %J 21st International Symposium on Metastable, Amorphous and Nanostructured Materials, ISMANAM 2014 %N %P %T Effect of the Shear Strain on the Microstructure and Texture of Mg-3Al-1Zn Sheets Processed by Differential Speed Rolling and Equal Channel Angular Pressing %U %X %0 journal article %@ 0925-8388 %A Victoria-Hernandez, J.,Yi, S.,Bohlen, J.,Kurz, G.,Letzig, D. %D 2014 %J Journal of Alloys and Compounds %N %P 189-197 %R doi:10.1016/j.jallcom.2014.07.083 %T The influence of the recrystallization mechanisms and grain growth on the texture of a hot rolled AZ31 sheet during subsequent isochronal annealing %U https://doi.org/10.1016/j.jallcom.2014.07.083 %X The texture development during isochronal annealing at 250, 300 and 350 °C for 30 min of a hot rolled Mg AZ31 sheet produced by twin-roll casting was studied in this work. It was found that the rolling texture shows some features that resemble the textures that develop in rolled Mg alloys with rare earth additions. During further heat treatment, special attention was given to the deformation and recrystallization mechanisms, and grain growth that control the texture development. It was found that at 250 and 300 °C extended recovery and discontinuous recrystallization influence the texture by generating strain free grains with off- basal orientation. Conversely, during annealing at 350 °C growth of grains with their c-axis close to the (0001) leads to the formation of the well-known basal type texture. %0 journal article %@ 0925-4005 %A Silva, E.,Bastos, A.C.,Neto, M.,Fernandes, A.J.,Silva, R.,Guerreiro, M.,Ferreira, S.,Zheludkevich, M.,Oliveira, F. %D 2014 %J Sensors and Actuators B %N %P 544-551 %R doi:10.1016/j.snb.2014.07.127 %T New fluorinated diamond microelectrodes for localized detection of dissolved oxygen %U https://doi.org/10.1016/j.snb.2014.07.127 %X The present work reports on a novel needle type oxygen microsensor based on boron doped diamond (BDD) with tailored surface aiming in better electrochemical performance. The microelectrodes are produced by growing diamond films using HFCVD (hot filament chemical vapor deposition) on top of electrochemically sharpened tungsten filaments. The diamond is functionalized using CF4 RF-plasma post-treatments resulting in fluorine termination of the surface.,The quantitative detection of the dissolved oxygen (DO) is demonstrated and supported with successful fitting to the theoretical values calculated for diffusion limited current on hemicylinder shape electrode. The developed MEs were calibrated and tested as probes for microamperometric mapping of dissolved oxygen in a Zn–Fe wire-electrode model galvanic couple immersed in 50 mM NaCl. Modified diamond MEs show a fast and stable response towards oxygen mapping, as well as stability for several days of measurements. %0 conference lecture %@ %A Barbini, A.,Carstensen, J.,Myazaki, M.,Fernandez, F.,dos Santos, J.F.,Huber, N. %D 2014 %J AeroMat 2014 %N %P %T A Comparison Between the Deformation Behaviour of Dissimilar AA2024-T3/AA7050-T7651 Welds Produced By Stationary Shoulder Friction Stir Welding and Standard Friction Stir Welding %U %X %0 journal article %@ 0167-577X %A Wong, T.W.,Wahit, M.U.,Kadir, M.R.A.,Soheilmoghaddam, M.,Balakrishnan, H. %D 2014 %J Materials Letters %N %P 105-108 %R doi:10.1016/j.matlet.2014.04.020 %T A novel poly(xylitol-co-dodecanedioate)/hydroxyapatite composite with shape-memory behaviour %U https://doi.org/10.1016/j.matlet.2014.04.020 %X A novel shape-memory polymer, poly(xylitol-co-dodecanedioate) (PXDD) was developed and the effect of hydroxyapatite (HA) in PXDD/HA composites on the chemical interactions, shape-memory and crystallization behaviours was studied. FTIR confirmed the formation of PXDD and also showed that the chemical structure did not change with the addition of HA. DSC and XRD revealed that the degree of crystallinity (Xc) of PXDD/HA composites improved in parallel to increasing HA content. The permanent shape is recovered with a precision of almost 100% as soon as the recovery temperature (Trec=48 °C) is reached. The findings of the study showed that PXDD/HA composites have great potential as shape-memory implant in minimal invasive surgeries. %0 journal article %@ 0169-4332 %A Alabbasi, A.,Mehjabeen, A.,Kannan, M.B.,Ye, Q.,Blawert, C. %D 2014 %J Applied Surface Science %N %P 463-467 %R doi:10.1016/j.apsusc.2014.02.100 %T Biodegradable polymer for sealing porous PEO layer on pure magnesium: An in vitro degradation study %U https://doi.org/10.1016/j.apsusc.2014.02.100 %X An attempt was made to seal the porous silicate-based plasma electrolytic oxidation (PEO) layer on pure magnesium (Mg) with a biodegradable polymer, poly(l-lactide) (PLLA), to delay the localized degradation of magnesium-based implants in body fluid for better in-service mechanical integrity. Firstly, a silicate-based PEO coating on pure magnesium was performed using a pulsed constant current method. In order to seal the pores in the PEO layer, PLLA was coated using a two-step spin coating method. The performance of the PEO–PLLA Mg was evaluated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The EIS results showed that the polarization resistance (Rp) of the PEO–PLLA Mg was close to two orders of magnitude higher than that of the PEO Mg. While the corrosion current density (icorr) of the pure Mg was reduced by 65% with the PEO coating, the PEO–PLLA coating reduced the icorr by almost 100%. As expected, the Rp of the PEO–PLLA Mg decreased with increase in exposure time. However, it was noted that the Rp of the PEO–PLLA Mg even after 100 h was six times higher than that of the PEO Mg after 48 h exposure, and did not show any visible localized attack. %0 journal article %@ 0167-577X %A Alabbasi, A.,Kannan, M.B.,Blawert, C. %D 2014 %J Materials Letters %N %P 188-191 %R doi:10.1016/j.matlet.2014.03.094 %T Dual layer inorganic coating on magnesium for delaying the biodegradation for bone fixation implants %U https://doi.org/10.1016/j.matlet.2014.03.094 %X In this study, a dual layer inorganic coating was formed on a pure magnesium metal using electrochemical methods to delay the biodegradation of the metal for potential bone fixation implant applications. Firstly, a layer of silicate-based coating was formed on the base metal using the plasma electrolytic oxidation (PEO) method. A second layer of calcium phosphate (CaP) was formed on the PEO coating using the electrodeposition method. in vitro electrochemical degradation testings showed that the double layer coating (PEO-CaP) has significantly improved the initial degradation resistance of the metal. Localized degradation was not evident on the PEO-CaP coated metal even after 72 h exposure to simulated body fluid (SBF). %0 conference lecture %@ %A Suh, J.,Victoria-Hernandez, J.,Letzig, D.,Golle, R.,Yi, S.,Bohlen, J.,Volk, W. %D 2014 %J 11th International Conference on Technology of Plasticity, ICTP 2014 %N %P %T Improvement of ductility at room temperature of Mg-3Al-1Zn alloy sheets processed by equal channel angular pressing %U %X %0 journal article %@ 1877-7058 %A Suh, J.,Victoria-Hernandez, J.,Letzig, D.,Golle, R.,Yi, S.,Bohlen, J.,Volk, W. %D 2014 %J Procedia Engineering %N %P 1517-1522 %R doi:10.1016/j.proeng.2014.10.183 %T Improvement of ductility at room temperature of Mg-3Al-1Zn alloy sheets processed by equal channel angular pressing %U https://doi.org/10.1016/j.proeng.2014.10.183 %X The effect of process temperature on the microstructure and mechanical properties of Mg-3Al-1Zn sheets processed by ECAP is investigated in this work. A novel tool was developed for the implementation of ECAP to deform sheets with dimension of 200 mm × 200 mm × 1.8 mm. ECAP trials were performed successfully at three temperatures of 175, 200 and 225 oC using an internal channel angle of 130o. After the ECAP process, significant grain refinement and texture changes were observed in the ECAPed sheets. The tensile tests at room temperature showed that uniform elongation along the direction of ECAP process increases with the process temperature. The highest uniform strain was found at 17% using a processing temperature of 225 oC. The tensile uniform elongation at room temperature was improved by 31% in comparison with the as-received material. %0 conference lecture (invited) %@ %A Yi, S.,Bohlen, J.,Victoria-Hernandez, J.,Brokmeier, H.-G.,Letzig, D.,Kim, Y.M.,Schell, N.,Schreyer, A.,Kainer, K.U. %D 2013 %J International Workshop on Processing-Microstructure-Mechanical Property of Magnesium Alloys %N %P %T Deformation behaviour of wrought Mg alloys: Influence of rare-earth elements addition %U %X %0 conference lecture %@ %A Kazum, O.,Kannan, M.B.,Scharnagl, N.,Blawert, C.,He, Y. %D 2013 %J 6th Internaternational Light Metals Technology Conference, LMT 2013 %N %P %T Electrochemical Corrosion Behaviour of WE54 Magnesium Alloy %U %X %0 journal article %@ 1359-6454 %A Victoria-Hernandez, J.,Yi, S.,Letzig, D.,Hernandez-Silva, D.,Bohlen, J. %D 2013 %J Acta Materialia %N 6 %P 2179-2193 %R doi:10.1016/j.actamat.2012.12.039 %T Microstructure and texture development in hydrostatically extruded MgAlZn alloys during tensile testing at intermediate temperatures %U https://doi.org/10.1016/j.actamat.2012.12.039 6 %X Tensile testing of hydrostatically extruded round bars of AZ31 and AZ61 has been performed to analyse the flow behaviour as well as the microstructure and texture development as a function of temperature (175–225 °C) and strain rate (0.0001–0.01 s−1). The post-testing microstructure is a result of dynamic recrystallization with varying significance of different texture components. In some cases the resulting textures are found to be similar to those textures that typically develop during extrusion of rare-earth-containing magnesium alloys. Dynamic recrystallization (DRX) and grain boundary sliding (GBS) are considered as the mechanisms that generate the changes in texture. Precipitates can exert a grain boundary pinning effect limiting grain growth. These different mechanisms contribute differently to the texture development if the testing parameters are changed. %0 journal article %@ 0255-5476 %A Braz Fernandes, F.M.,Mahesh, K.K.,Craciunescu, C.M.,Oliveira, J.P.,Schell, N.,Miranda, R.M.,Quintino, L.,Ocana, J.L. %D 2013 %J Materials Science Forum, European Symposium on Martensitic Transformations %N %P 338-343 %R doi:10.4028/www.scientific.net/MSF.738-739.338 %T In situ structural characterization of laser welded NiTi shape memory alloys %U https://doi.org/10.4028/www.scientific.net/MSF.738-739.338 %X Preserving the shape memory effect (SME) and superelasticity (SE) in shape memory alloys (SMAs) after a joining process is of great importance. In this work Ni-rich NiTi SMAs were laser welded using a Nd:YAG laser in continuous mode. A detailed structural characterization was carried by means of X-ray diffraction (XRD). It was possible to observe the existence of a microstructural gradient from the base material (BM), which contained only austenite, through the heat affected zone (HAZ) and the fusion zone (FZ), where both zones contained austenite and martensite. The mechanical behavior under cyclic load/unload of the welded samples may be explained taking in consideration the structural information retrieved from the XRD analysis. %0 journal article %@ 0255-5476 %A Kazum, O.,Kannan, M.B.,Scharnagl, N.,Blawert, C.,He, Y. %D 2013 %J Materials Science Forum, Light Metals Technology Conference, LMT 2013 %N %P 644-647 %R doi:10.4028/www.scientific.net/MSF.765.644 %T Electrochemical Corrosion Behaviour of WE54 Magnesium Alloy %U https://doi.org/10.4028/www.scientific.net/MSF.765.644 %X The electrochemical corrosion behaviour of WE54 magnesium alloy in 0.5 wt.% NaCl solution was studied using electrochemical techniques. Polarization results suggested that the rare-earths in WE54 alloy enhanced the passivation tendency of the alloy and decreased the corrosion current by ~30% compared to pure magnesium. Pitting corrosion resistance was also higher in WE54 alloy than that in pure magnesium. Long-term electrochemical impedance results showed that the polarization resistance of WE54 alloy was more than two times higher than that of pure magnesium even after initial passivity breakdown. %0 journal article %@ 0930-7575 %A Vautard, R.,Gobiet, A.,Jacob, D.,Belda, M.,Colette, A.,Deque, M.,Fernandez, J.,Garcia-Diez, M.,Goergen, K.,Guettler, I.,Halenka, T.,Karacostas, T.,Katragkou, E.,Keuler, K.,Kotlarski, S.,Mayer, S.,Meijgaard, E.van,Nikulin, G.,Patarcic, M.,Scinocca, J.,Sobolowski, S.,Suklitsch, M.,Teichmann, C.,Warrach-Sagi, K.,Wulfmeyer, V.,Yiou, P. %D 2013 %J Climate Dynamics %N 9-10 %P 2555-2575 %R doi:10.1007/s00382-013-1714-z %T The simulation of European heat waves from an ensemble of regional climate models within the EURO-CORDEX project %U https://doi.org/10.1007/s00382-013-1714-z 9-10 %X The ability of a large ensemble of regional climate models to accurately simulate heat waves at the regional scale of Europe was evaluated. Within the EURO-CORDEX project, several state-of-the art models, including non-hydrostatic meso-scale models, were run for an extended time period (20 years) at high resolution (12 km), over a large domain allowing for the first time the simultaneous representation of atmospheric phenomena over a large range of spatial scales. Eight models were run in this configuration, and thirteen models were run at a classical resolution of 50 km. The models were driven with the same boundary conditions, the ERA-Interim re-analysis, and except for one simulation, no observations were assimilated in the inner domain. Results, which are compared with daily temperature and precipitation observations (ECA&D and E-OBS data sets) show that, even forced by the same re-analysis, the ensemble exhibits a large spread. A preliminary analysis of the sources of spread, using in particular simulations of the same model with different parameterizations, shows that the simulation of hot temperature is primarily sensitive to the convection and the microphysics schemes, which affect incoming energy and the Bowen ratio. Further, most models exhibit an overestimation of summertime temperature extremes in Mediterranean regions and an underestimation over Scandinavia. Even after bias removal, the simulated heat wave events were found to be too persistent, but a higher resolution reduced this deficiency. The amplitude of events as well as the variability beyond the 90th percentile threshold were found to be too strong in almost all simulations and increasing resolution did not generally improve this deficiency. Resolution increase was also shown to induce large-scale 90th percentile warming or cooling for some models, with beneficial or detrimental effects on the overall biases. Even though full causality cannot be established on the basis of this evaluation work, the drivers of such regional differences were shown to be linked to changes in precipitation due to resolution changes, affecting the energy partitioning. Finally, the inter-annual sequence of hot summers over central/southern Europe was found to be fairly well simulated in most experiments despite an overestimation of the number of hot days and of the variability. The accurate simulation of inter-annual variability for a few models is independent of the model bias. This indicates that internal variability of high summer temperatures should not play a major role in controlling inter-annual variability. Despite some improvements, especially along coastlines, the analyses conducted here did not allow us to generally conclude that a higher resolution is clearly beneficial for a correct representation of heat waves by regional climate models. Even though local-scale feedbacks should be better represented at high resolution, combinations of parameterizations have to be improved or adapted accordingly. %0 journal article %@ 0167-577X %A Alabbasi, A.,Kannan, M.B.,Walter, R.,Stoermer, M.,Blawert, C. %D 2013 %J Materials Letters %N %P 18-21 %R doi:10.1016/j.matlet.2013.04.047 %T Performance of pulsed constant current silicate-based PEO coating on pure magnesium in simulated body fluid %U https://doi.org/10.1016/j.matlet.2013.04.047 %X In vitro degradation behaviour of a pulsed constant current silicate-based PEO coating on pure magnesium was studied using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation techniques. The PEO coating increased the polarisation resistance (Rp) of magnesium by an order of magnitude and reduced the corrosion current (icorr) by 65%. EIS modelling indicated that the inner compact layer resistance of the PEO coating was critical for the overall degradation resistance of the material. However, the breakdown potential from potentiodynamic polarisation curves and the post-degradation analysis suggested that the porous outer layer of the PEO coating played an important role in the stability of the inner compact layer. %0 journal article %@ 0048-9697 %A Mathison, C.,Wiltshire, A.,Dimri, A.P.,Falloon, P.,Jacob, D.,Kumar, P.,Moors, E.,Ridley, J.,Siderius, C.,Stoffel, M.,Yasunan, T. %D 2013 %J Science of the Total Environment %N S1 %P S4-S17 %R doi:10.1016/j.scitotenv.2012.04.066 %T Regional projections of North Indian climate for adaptation studies %U https://doi.org/10.1016/j.scitotenv.2012.04.066 S1 %X Adaptation is increasingly important for regions around the world where large changes in climate could have an impact on populations and industry. The Brahmaputra–Ganges catchments have a large population, a main industry of agriculture and a growing hydro-power industry, making the region susceptible to changes in the Indian Summer Monsoon, annually the main water source. The HighNoon project has completed four regional climate model simulations for India and the Himalaya at high resolution (25 km) from 1960 to 2100 to provide an ensemble of simulations for the region. In this paper we have assessed the ensemble for these catchments, comparing the simulations with observations, to give credence that the simulations provide a realistic representation of atmospheric processes and therefore future climate. We have illustrated how these simulations could be used to provide information on potential future climate impacts and therefore aid decision-making using climatology and threshold analysis. The ensemble analysis shows an increase in temperature between the baseline (1970–2000) and the 2050s (2040–2070) of between 2 and 4 °C and an increase in the number of days with maximum temperatures above 28 °C and 35 °C. There is less certainty for precipitation and runoff which show considerable variability, even in this relatively small ensemble, spanning zero. The HighNoon ensemble is the most complete data for the region providing useful information on a wide range of variables for the regional climate of the Brahmaputra–Ganges region, however there are processes not yet included in the models that could have an impact on the simulations of future climate. We have discussed these processes and show that the range from the HighNoon ensemble is similar in magnitude to potential changes in projections where these processes are included. Therefore strategies for adaptation must be robust and flexible allowing for advances in the science and natural environmental changes. %0 conference lecture %@ %A Victoria-Hernandez, J.,Bohlen, J.,Kurz, G.,Yi, S.,Perez-Valverde, F.,Letzig, D. %D 2013 %J International Congress and Exhibition on Light Materials Aluminium, Magnesium, Titanium and their Alloys, Euro LightMAT 2013 %N %P %T Microstructural, texture development and mechanical properties of a twin-roll cast Mg AZ31 sheets processed by equal and differential speed rolling %U %X %0 conference paper %@ %A Kazum, O.,Kannan, M.B.,Scharnagl, N.,Blawert, C.,He, Y. %D 2013 %J Light Metals Technology 2013, 6th Internaternational Light Metals Technology Conference, LMT 2013 %N %P 644-647 %T Electrochemical Corrosion Behaviour of WE54 Magnesium Alloy %U %X %0 journal article %@ 0894-8755 %A Nikulin, G.,Jones, C.,Giorgi, F.,Asrar, G.,Buechner, M.,Cerezo-Mota, R.,Christenden, O.B.,Deque, M.,Fernandez, J.,Haensler, A.,Meijgaard, E.van,Samuelsson, P.,Sylla, M.B.,Sushama, L. %D 2012 %J Journal of Climate %N 18 %P 6057-6078 %R doi:10.1175/JCLI-D-11-00375.1 %T Precipitation Climatology in an Ensemble of CORDEX-Africa Regional Climate Simulations %U https://doi.org/10.1175/JCLI-D-11-00375.1 18 %X An ensemble of regional climate simulations is analyzed to evaluate the ability of 10 regional climate models (RCMs) and their ensemble average to simulate precipitation over Africa. All RCMs use a similar domain and spatial resolution of ~50 km and are driven by the ECMWF Interim Re-Analysis (ERA-Interim) (1989–2008). They constitute the first set of simulations in the Coordinated Regional Downscaling Experiment in Africa (CORDEX-Africa) project. Simulated precipitation is evaluated at a range of time scales, including seasonal means, and annual and diurnal cycles, against a number of detailed observational datasets. All RCMs simulate the seasonal mean and annual cycle quite accurately, although individual models can exhibit significant biases in some subregions and seasons. The multimodel average generally outperforms any individual simulation, showing biases of similar magnitude to differences across a number of observational datasets. Moreover, many of the RCMs significantly improve the precipitation climate compared to that from their boundary condition dataset, that is, ERA-Interim. A common problem in the majority of the RCMs is that precipitation is triggered too early during the diurnal cycle, although a small subset of models does have a reasonable representation of the phase of the diurnal cycle. The systematic bias in the diurnal cycle is not improved when the ensemble mean is considered. Based on this performance analysis, it is assessed that the present set of RCMs can be used to provide useful information on climate projections over Africa. %0 journal article %@ 0870-8312 %A Neves, F.,Correia, J.B.,Martins, I.,Braz Fernandes, F.M.,Mahesh, K.K.,Stark, A.,Schell, N. %D 2012 %J Ciencia & Tecnologia dos Materiais %N 3-4 %P 40-43 %T In situ experiments with Synchrotron High-Energy X-rays of Ni-Ti alloys produced by powder metallurgy %U 3-4 %X The structural evolution that takes place during the homogenization heat treatments of powder metallurgical Ni-Ti alloys was studied by in situ synchrotron diffraction. It is proposed to get a deeper understanding of this phenomenonby,using different types of thermal/mechanical cycles.This work also intends to prove the feasibility of in situ X-ray diffraction studies during thermomechanical cycles and to demonstrate the interest of the combined dilatometry (under,compression) and diffraction data for the detailed analysis of the phase transformations in powder metallurgical Ni-Ti shape memory alloys. %0 conference lecture %@ %A Victoria-Hernandez, J.,Hernandez-Silva, D.,Bohlen, J.,Yi, S.,Letzig, D. %D 2012 %J 11th International Conference on Superplasticity in Advanced Materials, ICSAM 2012 %N %P %T Low temperature superplasticity of hydrostatically extruded Mg-Al-Zn alloys %U %X %0 journal article %@ 0946-2716 %A Bieback, K.,Wuchter, P.,Besser, D.,Franke, W.,Becker, M.,Ott, M.,Pacher, M.,Nan, M.,Stamm, C.,Klueter, H.,Mueller, A.,Ho, A.D. %D 2012 %J Journal of Molecular Medicine %N 7 %P 773-782 %R doi:10.1007/s00109-012-0915-y %T Mesenchymal stromal cells (MSCs): science and f(r)iction %U https://doi.org/10.1007/s00109-012-0915-y 7 %X Due to their multi-lineage differentiation capacity, support of haematopoiesis, immunomodulation and secretion of proregenerative factors, mesenchymal stem/stromal cells (MSCs) are in the focus of intense research since decades. The literature is replete with reports on their potential in preclinical model systems. However, the heterogeneity of the primary cell population as starting material and the diverse protocols for isolation and cultivation are hampering progress in their clinical application. Consensus on common standards and harmonised isolation and characterisation protocols are important to ensure safety and efficacy. This review focuses on the recent scientific evidence of clinically relevant properties and on the speculative cardiomyogenic and hepatic differentiation potential of MSCs. Special emphasis is put on the importance of standardisation and harmonisation in clinical-scale manufacturing. %0 journal article %@ 0255-5476 %A Victoria-Hernandez, J.,Hernandez-Silva, D.,Bohlen, J.,Yi, S.,Letzig, D. %D 2012 %J Materials Science Forum, Superplasticity in Advanced Materials, ICSAM 2012 %N %P 307-315 %R doi:10.4028/www.scientific.net/MSF.735.307 %T Low temperature superplasticity of hydrostatically extruded Mg-Al-Zn alloys %U https://doi.org/10.4028/www.scientific.net/MSF.735.307 %X In this work, the superplastic behavior of AZ31, AZ61 and AZ80 magnesium alloys was investigated. The alloys were hydrostatically extruded at only 150 °C to get fine grained microstructures (−2, 10−3 and 10−4 s−1. It was found that all alloys exhibited superplasticity at 200 °C, 175 °C and 225 °C for AZ31, AZ61 and AZ80 alloys, respectively. Low temperature dynamic recrystallisation played an important role for generating a finer and homogeneous microstructure during testing which enhances the deformation behavior of the alloys at these temperatures. %0 journal article %@ 0870-8312 %A Martins, R.M.S.,Schell, N.,Mahesh, K.K.,Silva, R.J.C.,Braz-Fernandes, F.M. %D 2012 %J Ciencia & Tecnologia dos Materiais %N 3-4 %P 44-52 %T X-ray diffraction studies during magnetron co-sputtering of Ni-Ti shape memory alloy films %U 3-4 %X The study of Ni-Ti shape memory alloy films is of great technological interest for applications in the field,of microengineering. They can work as sensors and actuators at the same time. However, there are still important issues unresolved like formation of film crystallographic orientation and its control. Films exhibiting the two-way shape memory effect are also required.,A two-magnetron sputter deposition chamber mounted into the six-circle diffractometer of the Rossendorf Beamline at the European Synchrotron Radiation Facility was used for the processing of Ni-Ti films. The in-situ x-ray diffraction studies enabled to identify the different steps of the structural evolution during film growth.,Deposition conditions leading to Ni-Ti films mainly containing grains with (100) or (110) planes of the B2 phase parallel to the film surface were successfully defined. This is an important achievement since texture has a strong influence on the,extent of the strain recovery. The deposition of films with a “two-way” actuation (films with a combination of superelasticity and shape memory characteristics) was also achieved. It will allow the development of smaller devices since no consideration,has to be paid to a resetting spring. %0 journal article %@ 0261-3069 %A Kannan, M.B.,Dietzel, W. %D 2012 %J Materials and Design %N %P 321-326 %R doi:10.1016/j.matdes.2012.06.007 %T Pitting-induced hydrogen embrittlement of magnesium-aluminium alloy %U https://doi.org/10.1016/j.matdes.2012.06.007 %X In this study, the pitting corrosion susceptibility and its role on the hydrogen embrittlement behavior of AZ80 magnesium alloy were studied using slow strain rate testing (SSRT), electrochemical technique and immersion test method. The electrochemical and immersion tests in chloride-containing solution revealed severe pitting corrosion in the alloy. The SSRT results of the alloy under continuously-exposed conditions in chloride-containing solution and in distilled water showed that the mechanical properties of the alloy deteriorated considerably in both the solutions. Pre-exposure of the alloy in distilled water did not show any considerable change in the mechanical properties of the alloy, however in chloride-containing solution a significant loss in the mechanical properties was noticed. Cleavage facets were observed in the vicinity of the localized attacked region of the alloy pre-exposed in chloride-containing solution. Interestingly, desiccating the pre-exposed (in chloride-containing solution) samples reduced the loss in the mechanical properties, which could be attributed to reversible hydrogen. Thus, the study suggests that pitting corrosion facilitates hydrogen entry into the alloy and causes hydrogen embrittlement. %0 conference poster %@ %A Braz Fernandes, F.M.,Mahesh, K.,Craciunescu, C.M.,Oliveira, J.P.,Schell, N.,Miranda, R.M.,Ocana, J.L. %D 2012 %J 9th European Symposium on Martensitic Transformations, ESOMAT 2012 %N %P %T Structural Characterization by X-Ray Diffraction of Laser Welded Shape Memory Alloys %U %X %0 conference paper %@ %A Braz Fernandes, F.M.,Mahesh, K.K.,Neves, F.,Stark, A.,Schell, N. %D 2012 %J Proceedings of the15th International Conference on Experimental Mechanics, ICEM 15, Paper 2858 %N %P 1-2 %T In situ study of thermomechanical cycling of shape memory alloys %U %X %0 conference object %@ %A Braz Fernandes, F.M.,Mahesh, K.,Craciunescu, C.M.,Oliveira, J.P.,Schell, N.,Miranda, R.M.,Ocana, J.L. %D 2012 %J Book of Abstracts, 9th European Symposium on Martensitic Transformations, ESOMAT 2012, Poster P4 %N %P 86 %T Structural Characterization by X-Ray Diffraction of Laser Welded Shape Memory Alloys %U %X %0 conference paper %@ %A Braz Fernandes, F.M.,Mahesh, K.K.,Craciunescu, C.M.,Oliveira, J.P.,Schell, N.,Miranda, R.M.,Ocana, J.L. %D 2012 %J Proceedings of the15th International Conference on Experimental Mechanics, ICEM 15, Paper 2949 %N %P 1-7 %T Structural characterization by x-ray diffraction of laser welded shape memory alloys %U %X %0 conference lecture %@ %A Braz Fernandes, F.M.,Mahesh, K.K.,Craciunescu, C.M.,Oliveira, J.P.,Schell, N.,Miranda, R.M.,Ocana, J.L. %D 2012 %J 15th International Conference on Experimental Mechanics, ICEM 15 %N %P %T Structural characterization by x-ray diffraction of laser welded shape memory alloys %U %X %0 conference lecture %@ %A Braz Fernandes, F.M.,Mahesh, K.K.,Neves, F.,Stark, A.,Schell, N. %D 2012 %J 15th International Conference on Experimental Mechanics, ICEM 15 %N %P %T In situ study of thermomechanical cycling of shape memory alloys %U %X %0 conference poster %@ %A Braz Fernandes, F.M.,Neves, F.,Mahesh, K.,Stark, A.,Schell, N. %D 2012 %J 9th European Symposium on Martensitic Transformations, ESOMAT 2012 %N %P %T In-Situ Study of Homogenization Thermomechanical Treatment of Ni-Ti Shape Memory Alloys Produced by Powder Metallurgy %U %X %0 conference object %@ %A Braz Fernandes, F.M.,Neves, F.,Mahesh, K.,Stark, A.,Schell, N. %D 2012 %J Book of Abstracts, 9th European Symposium on Martensitic Transformations, ESOMAT 2012, Poster P5 %N %P 86 %T In-Situ Study of Homogenization Thermomechanical Treatment of Ni-Ti Shape Memory Alloys Produced by Powder Metallurgy %U %X %0 journal article %@ 0255-5476 %A Kannan, M.B.,Blawert, C.,Dietzel, W. %D 2011 %J Materials Science Forum, Light Metals Technology V %N %P 385-388 %R doi:10.4028/www.scientific.net/MSF.690.385 %T Electrochemical Corrosion Behaviour of ZE41 and QE22 Magnesium Alloys %U https://doi.org/10.4028/www.scientific.net/MSF.690.385 %X The study suggests that the rare-earths containing magnesium alloys ZE41 and QE22 exhibit a poorer corrosion resistance than the AZ80 magnesium alloy. Electrochemical experiments showed that the two rare-earths containing alloys are highly susceptible to localized corrosion. Post corrosion analysis revealed intergranular and pitting corrosion in ZE41, whereas QE22 alloy underwent only pitting corrosion. %0 journal article %@ 1552-4973 %A Kannan, M.B.,Singh Raman, R.K.,Witte, F.,Blawert, C.,Dietzel, W. %D 2011 %J Journal of Biomedical Materials Research B %N 2 %P 303-309 %R doi:10.1002/jbm.b.31766 %T Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid %U https://doi.org/10.1002/jbm.b.31766 2 %X Applications of magnesium alloys as biodegradable orthopaedic implants are critically dependent on the mechanical integrity of the implant during service. In this study, the mechanical integrity of an AZ91 magnesium alloy was studied using a constant extension rate tensile (CERT) method. The samples in two different geometries that is, circumferentially notched (CN), and circumferentially notched and fatigue cracked (CNFC), were tested in air and in simulated body fluid (SBF). The test results show that the mechanical integrity of the AZ91 magnesium alloy decreased substantially (∼50%) in both the CN and CNFC samples exposed to SBF. Fracture surface analysis revealed secondary cracks suggesting stress corrosion cracking susceptibility of the alloy in SBF. %0 journal article %@ 0957-4530 %A Kannan, M.B.,Dietzel, W.,Zettler, R. %D 2011 %J Journal of Materials Science: Materials in Medicine %N 11 %P 2397-2401 %R doi:10.1007/s10856-011-4429-x %T In vitro degradation behaviour of a friction stir processed magnesium alloy %U https://doi.org/10.1007/s10856-011-4429-x 11 %X In this study, the biodegradation behaviour of a friction stir processed AZ31 magnesium alloy was investigated. electrochemical experiments in simulated body fluid suggest that friction stir processing enhances the degradation resistance of the alloy. Scanning electron microscopy analysis on the investigated alloy reveals that the depth of localized attack decreases when the alloy is friction stir processed. However, quantitatively friction stir processing alone might not solve the issue of high in-vitro degradation of the alloy, but this treatment could be highly beneficial in combination with a biocompatible coating. %0 conference lecture %@ %A Kannan, M.B.,Blawert, C.,Dietzel, W. %D 2011 %J 5th International Light Metals Technology Conference 2011 %N %P %T Electrochemical Corrosion Behaviour of ZE41 and QE22 Magnesium Alloys %U %X %0 conference paper %@ %A Kannan, M.B.,Blawert, C.,Dietzel, W. %D 2011 %J Proceedings of the Fifth International Light Metals Technology Conference 2011 %N %P 385-388 %T Electrochemical Corrosion Behaviour of ZE41 and QE22 Magnesium Alloys %U %X %0 conference poster %@ %A Gutierrez Hernandez, M.del C.,Nedeljkovic, D.,Fritsch, D. %D 2011 %J 10th International Conference on Materials Chemistry, MC10 %N %P %T Mixed matrix membranes made of the Polyethylene glycol based polymers Pebax® and Polyactive™ and different zeolites %U %X %0 conference poster %@ %A Gutierrez Hernandez, M.del C.,Fritsch, D.,Pauls, J.-R. %D 2011 %J 28th European Membrane Summer School %N %P %T Blends containing Pebax® 1657 and Polyactive™ with morpholine based polymers for gas separation %U %X %0 book part %@ %A Atrens, A.,Dietzel, W.,Srinivasan, P.B.,Winzer, N.A.,Kannan, M.B. %D 2011 %J Stress Corrosion Cracking: Theory and Practice %N %P 341-380 %T Stress corrosion cracking (SCC) of magnesium alloys %U %X Stress corrosion cracking (SCC) of Mg alloys is either intergranular (IGSCC) or transgranular (TGSCC). IGSCC is typically caused by a continuous second phase along the grain boundaries, which accelerates the corrosion of the adjacent Mg matrix by micro-galvanic corrosion. Thus IGSCC is expected in all such alloys, typical of most of the creep resistant alloys. All Mg alloys with continuous second phases are expected to be prone to IGSCC because each known second phase is less reactive than the matrix alpha-Mg; the degree of severity depends on the electrochemical properties of the second phase; these electrochemical properties need to be studied. IGSCC can be avoided by appropriate Mg alloy design. Of more interest TGSCC, the intrinsic form of SCC, is caused by an interaction of hydrogen with the microstructure so a study of H-trap interactions is needed in order to understand this damage mechanism and in order to design alloys resistant to TGSCC. This understanding is urgently needed if wrought alloys are to be used safely in service because prior research indicates that many Mg alloys have a threshold stress for SCC of about half the yield stress in common environments including high-purity water. %0 book part %@ %A Kannan, M.B.,Srinivasan, P.B.,Raja, V.S. %D 2011 %J Stress Corrosion Cracking: Theory and Practice %N %P 307-340 %T Stress corrosion cracking (SCC) of aluminium alloys %U %X The stress corrosion cracking (SCC) behaviour of aluminium alloys has been studied for the past five decades and is still a research area of high interest due to the demand for higher strength aluminium alloys for fuel saving. This chapter brings out the general understanding of the SCC mechanism(s) and the critical metallurgical issues affecting the SCC,behaviour of aluminium alloys. The developments made so far with regard to alloying and heat treatment of aluminium alloys for high SCC resistance are discussed. An overview of the available literature on the SCC of aluminium alloy weldments and aluminium alloy metal matrix composites are also presented. %0 journal article %@ 0921-5093 %A Victoria-Hernandez, J.,Hernandez-Silva, D.,Yi, S.,Letzig, D.,Bohlen, J. %D 2011 %J Materials Science and Engineering A %N %P 411-417 %R doi:10.1016/j.msea.2011.09.104 %T Intermediate temperature deformation behaviour of fine grained AZ61 alloy processed by hydrostatic extrusion %U https://doi.org/10.1016/j.msea.2011.09.104 %X In this work, the intermediate temperature deformation behaviour of alloy AZ61 processed by hydrostatic extrusion has been examined. By means of this thermomechanical process it is possible to refine the microstructure to generate an average grain size of about 5 μm directly from the as-cast microstructure in one single step when extruded at only 150 °C and an extrusion rate of 8 m/min. The evolution of microstructure and texture after tensile testing at 175, 200 and 225 °C in air at three different strain rates of 10−2, 10−3 and 10−4 s−1 were investigated. It was found that the alloy exhibited low temperature superplasticity at 175 °C (0.33Tm, where Tm is the melting point on the absolute scale). The maximum elongation recorded was 540% for AZ61 tested at 225 °C and 1.5 × 10−3 s−1. The intermediate temperature deformation behaviour and deformation mechanisms involved were discussed in terms of microstructure and texture development. %0 journal article %@ 0021-8979 %A Deprez, E.,Munoz-Marquez, M.A.,Jimenez de Haro, M.C.,Palomares, F.J.,Soria, F.,Dornheim, M.,Bormann, R.,Fernandez, A. %D 2011 %J Journal of Applied Physics %N %P 014913 %R doi:10.1063/1.3525803 %T Combined x-ray photoelectron spectroscopy and scanning electron microscopy studies of the LiBH4–MgH2 reactive hydride composite with and without a Ti-based additive %U https://doi.org/10.1063/1.3525803 %X A detailed electronic and microstructural characterization is reported for the LiBH4–MgH2 reactive hydride composite system with and without titanium isopropoxide as additive. Surface characterization by x-ray photoelectron spectroscopy combined to a morphological study by scanning electron microscopy as well as elemental map composition analysis by energy dispersive x-ray emission are presented in this paper for the first time for all sorption steps. Although sorption reactions are not complete at the surface due to the unavoidable superficial oxidation, it has been shown that the presence of the additive is favoring the heterogeneous nucleation of the MgB2 phase. Ti-based phases appear in all the samples for the three sorption steps well dispersed and uniformly distributed in the material. Li-based phases are highly dispersed at the surface while the Mg-based ones appear, either partially covered by the Li-based phases, or forming bigger grains. Ball milling is promoting mixing of phases and a good dispersion of the additive what favors grain refinement and heterogeneous reactions at the interfaces. %0 journal article %@ 0094-8276 %A Saeed, S.,Mueller, W.A.,Hagemann, S.,Jacob, D.,Mujumdar, M.,Krishnan, R. %D 2011 %J Geophysical Research Letters %N 8 %P L08702 %R doi:10.1029/2011GL046984 %T Precipitation variability over the South Asian monsoon heat low and associated teleconnections %U https://doi.org/10.1029/2011GL046984 8 %X The present study examines the precipitation variability over the South Asian monsoon heat low region and associated teleconnections using high resolution (T106L31) climate simulations performed with the ECHAM5 model. It is found that an intensification of the heat low in response to enhanced precipitation/convection over northwestern India-Pakistan (NWIP) can induce large-scale circulation anomalies that resemble the northern summer circumglobal teleconnection (CGT) wave-like pattern extending well into the Asian monsoon region. Accordingly the wave-like response to rainfall increase over the heat low region is associated with anomalous ascent over northern China and descent over the South China Sea. Additionally, small but statistically significant lead-lag correlations between the heat low and precipitation over northern China further suggest that the detected signal pertains to the true features of the process. On the other hand, suppressed convection and rainfall over the heat low region do not reveal any significant large-scale circulation anomalies. %0 journal article %@ 1932-7447 %A Deprez, E.,Munoz-Marquez, M.A.,Roldan, M.A.,Prestipino, C.,Palomares, F.J.,Bonatto Minella C.,Boesenberg, U.,Dornheim, M.,Bormann, R.,Fernandez, A. %D 2010 %J The Journal of Physical Chemistry C %N 7 %P 3309-3317 %R doi:10.1021/jp910955r %T Oxidation State and Local Structure of Ti-Based Additives in the Reactive Hydride Composite 2LiBH4 + MgH2 %U https://doi.org/10.1021/jp910955r 7 %X Nowadays, the technological utilization of reactive hydride composites (RHC) as hydrogen storage materials is limited by their reaction kinetics. However, addition of transition-metal-based additives, for instance titanium isopropoxide (Ti-iso), to the 2LiBH4+MgH2 system, results in a significant improvement of sorption kinetics. In this work, the evolution of chemical state and local structure of the Ti-based additive has been investigated by means of X-ray absorption (XAS) and photoemission (XPS) spectroscopy. X-ray absorption near-edge structure (XANES) as well as extended X-ray absorption fine structure (EXAFS) analysis have been undertaken at the Ti K-edge. The measurements reveal the formation of a highly dispersed and disordered TiO2-like phase during ball milling. During first desorption reduced titanium oxide and titanium boride are formed and remain stable upon cycling. The surface analysis performed by XPS shows that the reduction processes of the Ti-based additive during first desorption is coupled to the migration of the Ti species from the surface to the bulk of the material. Several factors, related to favoring heterogeneous nucleation of MgB2 and the increase of interfacial area through grain refinement are proposed as potential driving force, among other effects, for the observed kinetic improvement. %0 book part %@ %A Lowe, J.A.,Woodworth, P.L.,Knutson, T.,McDonald, R.E.,McInnes, K.L.,Woth, K.,Storch, H.v.,Wolf, J.,Swail, V.,Bernier, N.B.,Gulev, S.,Horsburgh, K.J.,Unnikrishnan, A.S.,Hunter, J.R.,Weisse, R. %D 2010 %J Understanding Sea-level Rise and Variability %N %P 326-376 %T Past and Future Changes in Extreme Sea Levels and Waves %U %X This chapter discusses changes in extreme sea levels and waves and is divided into four parts. First, we review changes in extreme sea levels and waves in the recent past. Then we discuss changes in the atmospheric storm events that drive,extreme sea - level changes. There follows a review of recent advances in the modeling of future extreme events. (The reader is referred to the list of abbreviations and acronyms at the front of the book for models mentioned in the text.) The European shelf, Bay of Bengal and Australian regions have been investigated in greater detail than most other areas, and are selected for this section as special case studies of future change. Finally, we highlight issues that we believe need to be addressed in order to further understand the changes of the past and better predict those of the future. %0 journal article %@ 0040-6090 %A Martins, R.M.S.,Schell, N.,Reuther, H.,Pereira, L.,Mahesh, K.K.,Silva, R.J.C.,Braz Fernandes, F.M. %D 2010 %J Thin Solid Films %N 1 %P 122-128 %R doi:10.1016/j.tsf.2010.07.078 %T Texture development, microstructure and phase transformation characteristics of sputtered Ni–Ti Shape Memory Alloy films grown on TiN<111> %U https://doi.org/10.1016/j.tsf.2010.07.078 1 %X Near equiatomic Ni–Ti films have been deposited by magnetron co-sputtering on TiN films with a topmost layer formed by < 111> oriented grains (TiN/SiO2/Si(100) substrate) in a chamber installed at a synchrotron radiation beamline. In-situ X-ray diffraction during Ni–Ti film growth and their complementary ex-situ characterization by Auger electron spectroscopy, scanning electron microscopy and electrical resistivity measurements during temperature cycling have allowed us to establish a relationship between the structure and processing parameters.,A preferential development of < 110> oriented grains of the B2 phase since the beginning of the deposition has been observed (without and with the application of a substrate bias voltage of −45 and −90 V). The biaxial stress state is considerably influenced by the energy of the bombarding ions, which is dependent on the substrate bias voltage value applied during the growth of the Ni–Ti film. Furthermore, the present work reveals that the control of the energy of the bombarding ions is a promising tool to vary the transformation characteristics of Ni–Ti films, as shown by electrical resistivity measurements during temperature cycling.,The in-situ study of the structural evolution of the growing Ni–Ti film as a consequence of changing the Ti:Ni ratio during deposition (on a TiN<111> layer) has also been performed. The preferential growth of < 110> oriented grains of the Ni–Ti B2 phase has been as well observed despite the precipitation of Ti2Ni during the deposition of a Ti-rich Ni–Ti film fraction. Functionally graded Ni–Ti films should lead to an intrinsic “two-way” shape memory effect which is a plus for the miniaturization of Ni–Ti films based devices in the field of micro-electro-mechanical systems. %0 journal article %@ 1359-6454 %A Deprez, E.,Justo, A.,Rojas, T.C.,Lopez-Cartes, C.,Bonatto Minella, C.,Boesenberg, U.,Dornheim, M.,Bormann. R.,Fernandez, A. %D 2010 %J Acta Materialia %N 17 %P 5683-5694 %R doi:10.1016/j.actamat.2010.06.043 %T Microstructural study of the LiBH4–MgH2 reactive hydride composite with and without Ti-isopropoxide additive %U https://doi.org/10.1016/j.actamat.2010.06.043 17 %X An exhaustive microstructural characterization is reported for the LiBH4–MgH2 reactive hydride composite (RHC) system with and without titanium isopropoxide additive. X-ray diffraction with Rietveld analysis, transmission electron microscopy coupled to energy dispersive X-ray analysis, selected-area electron diffraction and electron energy loss spectroscopy are presented in this paper for the first time for this system for all sorption steps. New data are reported regarding average crystallite and grain size, microstrain, phase formation and morphology; these results contribute to the understanding of the reaction mechanism and the influence of the additives on the kinetics. Microstructural effects, related to the high dispersion of titanium-based additives, result in a distinct grain refinement of MgB2 and an increase in the number of reaction sites, causing acceleration of desorption and absorption reactions. Considerations on the stability of phases under electron beam irradiation have also been reported. %0 journal article %@ 0255-5476 %A Paula, A.S.,Mahesh, K.K.,Schell, N.,Braz Fernandes, F.M. %D 2010 %J Materials Science Forum, Advanced Materials Forum V %N %P 618-623 %R doi:10.4028/www.scientific.net/MSF.636-637.618 %T Textural Modifications during Recovery in Ti-Rich Ni-Ti Shape Memory Alloy Subjected to Low Level of Cold Work Reduction %U https://doi.org/10.4028/www.scientific.net/MSF.636-637.618 %X In shape memory alloys (SMA), the texture can be an interesting factor influencing the anisotropic physical and mechanical characteristics during the phase transformations. It is well known that the texture significantly influences the stress-strain curve and shape memory strain of NiTi SMA. The aim of the present experiment was to analyze the textural modifications in the Ti-rich Ni-Ti SMA after annealing at moderate (500ºC for 30 min) and subsequent low level of cold work reduction (10% thickness reduction). The textural results were obtained by X-Ray Diffraction (XRD) during thermal cycling in three points: (i) at room temperature (B19’ phase, after cold work), (ii) at 180ºC (B2 phase), and (iii) at room temperature (B19’ phase, after cooling from 180ºC). The phase transformations were characterized by Differential Scanning Calorimetry (DSC) and XRD. %0 journal article %@ 0042-207X %A Martins, R.M.S.,Schell, N.,Borany, J.V.,Mahesh, K.K.,Silva, R.J.C.,Braz Fernandes, F.M. %D 2010 %J Vacuum %N 7 %P 913-919 %R doi:10.1016/j.vacuum.2009.12.012 %T Structural evolution of magnetron sputtered shape memory alloy Ni–Ti films %U https://doi.org/10.1016/j.vacuum.2009.12.012 7 %X Near equiatomic and Ti-rich Ni–Ti polycrystalline films have been deposited by magnetron co-sputtering using a chamber installed at a synchrotron radiation beamline. The in situ X-ray diffraction studies enabled the identification of different steps of the structural evolution during film processing.,The depositions on a 140 nm amorphous SiO2 buffer layer heated at 520 °C (without applying bias voltage, Vb, to the substrate) led to a preferential growth of <100> oriented grains of the Ni–Ti B2 phase from the beginning of film growth until the end of the deposition. Films exhibiting a preferential growth of <110> oriented grains of the Ni–Ti B2 phase from the beginning of the deposition were obtained (without and with a Vb of −45 V) by using a TiN coating with a topmost layer formed by <111> oriented grains. Those trends have been observed for the growth of near equiatomic (≈50.0 at.% Ti–Ni) and Ti-rich (≈50.8 at.% Ti–Ni) Ni–Ti films.,Additionally, an ion gun had been commissioned, which allows ion bombardment during sputter deposition or post-deposition ion irradiation. In this first series of experiments, a Ni–Ti film was irradiated with He ions after deposition (without exposing the film to the atmosphere, i.e., avoiding surface oxide formation), thus modifying deliberately the microstructure of the film locally. %0 journal article %@ 0953-8984 %A Doebrich, F.,Elmas, M.,Ferdinand, A.,Markmann, J.,Sharp, M.,Eckerlebe, H.,Kohlbrecher, J.,Birringer, R.,Michels, A. %D 2009 %J Journal of Physics: Condensed Matter %N %P 156003 %R doi:10.1088/0953-8984/21/15/156003 %T Grain-boundary-induced spin disorder in nanocrystalline gadolinium %U https://doi.org/10.1088/0953-8984/21/15/156003 %X Based on experimental magnetic-field-dependent neutron scattering data, we have calculated the autocorrelation function of the spin misalignment of nanocrystalline 160gadolinium. The analysis suggests the existence of two characteristic length scales in the spin system: the smaller one is about 5 nm and is attributed to the defect cores of the grain boundaries, whereas the larger length scale is of the order of the average crystallite size D = 21 nm and presumably describes the response of the magnetization to the magnetic anisotropy field of the individual crystallites. %0 journal article %@ 1059-9495 %A Martins, R.M.S.,Schell, N.,Mahesh, K.K.,Pereira, L.,Silva, R.J.C.,Braz Fernandes, F.M. %D 2009 %J Journal of Materials Engineering and Performance %N 5-6 %P 543-547 %R doi:10.1007/s11665-009-9484-9 %T Texture Development and Phase Transformation Behavior of Sputtered Ni-Ti Films %U https://doi.org/10.1007/s11665-009-9484-9 5-6 %X It is essential to identify and control the preferential orientation of Ni-Ti shape memory alloy (SMA) films since it is a crucial factor in determining the shape memory behavior. In the present work, in situ studies by synchrotron radiation scattering enabled to identify the different steps of the structural evolution of Ni-Ti films during co-sputtering deposition. For micro-electromechanical systems (MEMS) integration, there is a need for an electrically and thermally insulating or sacrificial layer. Widening the scope of previous experiments concerning the influence of the deposition parameters on the structure of the Ni-Ti films, the incorporation of a TiN buffer layer has been tested. Here, it is established a relationship between the TiN substrates and Ni-Ti texture development (B2 phase). Ni-Ti films mainly containing grains with (110) or (211) planes of the B2 phase parallel to the film surface could be produced using TiN buffer layers with distinct thickness values. The electrical resistivity measurements performed during temperature cycling have shown that the crystallographic orientations of the Ni-Ti films influence their phase transformation characteristics. The resistivity increase during R-phase transformation, especially visible on cooling, is higher for Ni-Ti films with a higher fraction of grains of the B2 phase with (211) parallel to the film surface. %0 report part %@ %A Martins, R.M.S.,Schell, N.,Mahesh, K.K.,Silva, R.J.C.,Braz Fernandes, F.M. %D 2009 %J Bi-Annual Report 2007/2008 - Wissenschaftlich-Technische Berichte – Forschungszentrum Dresden-Rossendorf %N %P 21-24 %T In-situ x-ray diffraction studies during co-sputtering deposition of Ni-Ti shape memory alloy films %U %X %0 conference lecture %@ %A Martins, R.M.S.,Schell, N.,Gordo, P.R.,Maneira, M.J.P.,Silva, R.J.C.,Braz Fernandes, F.M. %D 2009 %J 7th Iberian Vacuum Meeting and the 5th European Topical Conference on Hard Coatings %N %P %T Development of sputtered Shape Memory Alloy (SMA) Ni–Ti films for actuation in ice cooled environments %U %X Due to the high sensitivity of Ni–Ti films to environmental changes, e.g. thermal, and/or to stress, they are ideal materials for applications on micro-sensors.,It was aimed to obtain Ni–Ti films exhibiting the beginning of the B2 left right double arrow R-phase transformation between room temperature (RT) and 0 °C. Thus, films with a slightly Ni-rich composition were prepared by sputtering, without intentional heating of the substrate. The Ni–Ti films were deposited on an Si3N4 intermediate layer previously deposited on naturally oxidized Si(100). The crystallization behaviour of the samples (at a constant temperature of 430 °C) was studied by X-ray diffraction in grazing incidence geometry off-plane (GIXD) at a synchrotron-radiation beamline. The GIXD patterns obtained during the annealing process of the Ni–Ti polycrystalline films revealed mainly an austenitic structure (B2 phase) and the precipitation of Ni4Ti3. The results have also shown that the presence of an intermediate layer of Si3N4 enhances the crystallization process of the Ni–Ti sputtered films when compared to the films deposited directly on single-crystal Si (with native oxide).,The phase transformation behaviour of the Ni–Ti film on Si3N4 was evaluated by XRD in off-plane Bragg–Brentano geometry during cooling (RT → −40 °C) and heating (−40 °C → RT). It has been observed that a high fraction of the Ni–Ti film is already transformed to R-phase at 9 °C (austenitic at RT), as well as a very small temperature hysteresis for the B2 left right double arrow R-phase transformation.,After the characterization described above, the film was removed from the substrate. The free-standing film showed a pronounced “two-way” shape memory effect (SME). In the austenitic state the film presents a flat shape. During cooling, by reducing its distance from ice cubes (i.e., decreasing the surrounding temperature), the film starts bending exhibiting a final curled shape (yet without touching the ice). On heating it recovers its flat shape. The authors attribute the nature of this “two-way” SME to the Ni4Ti3 precipitates that formed during the heat treatment. %0 journal article %@ 0042-207X %A Martins, R.M.S.,Schell, N.,Gordo, P.R.,Maneira, M.J.P.,Silva, R.J.C.,Braz Fernandes, F.M. %D 2009 %J Vacuum %N 10 %P 1299-1302 %R doi:10.1016/j.vacuum.2009.03.027 %T Development of sputtered Shape Memory Alloy (SMA) Ni–Ti films for actuation in ice cooled environments %U https://doi.org/10.1016/j.vacuum.2009.03.027 10 %X Due to the high sensitivity of Ni–Ti films to environmental changes, e.g. thermal, and/or to stress, they are ideal materials for applications on micro-sensors.,It was aimed to obtain Ni–Ti films exhibiting the beginning of the B2 left right double arrow R-phase transformation between room temperature (RT) and 0 °C. Thus, films with a slightly Ni-rich composition were prepared by sputtering, without intentional heating of the substrate. The Ni–Ti films were deposited on an Si3N4 intermediate layer previously deposited on naturally oxidized Si(100). The crystallization behaviour of the samples (at a constant temperature of 430 °C) was studied by X-ray diffraction in grazing incidence geometry off-plane (GIXD) at a synchrotron-radiation beamline. The GIXD patterns obtained during the annealing process of the Ni–Ti polycrystalline films revealed mainly an austenitic structure (B2 phase) and the precipitation of Ni4Ti3. The results have also shown that the presence of an intermediate layer of Si3N4 enhances the crystallization process of the Ni–Ti sputtered films when compared to the films deposited directly on single-crystal Si (with native oxide).,The phase transformation behaviour of the Ni–Ti film on Si3N4 was evaluated by XRD in off-plane Bragg–Brentano geometry during cooling (RT → −40 °C) and heating (−40 °C → RT). It has been observed that a high fraction of the Ni–Ti film is already transformed to R-phase at 9 °C (austenitic at RT), as well as a very small temperature hysteresis for the B2 left right double arrow R-phase transformation.,After the characterization described above, the film was removed from the substrate. The free-standing film showed a pronounced “two-way” shape memory effect (SME). In the austenitic state the film presents a flat shape. During cooling, by reducing its distance from ice cubes (i.e., decreasing the surrounding temperature), the film starts bending exhibiting a final curled shape (yet without touching the ice). On heating it recovers its flat shape. The authors attribute the nature of this “two-way” SME to the Ni4Ti3 precipitates that formed during the heat treatment. %0 journal article %@ 0295-5075 %A Michels, A.,Doebrich, F.,Elmas, M.,Ferdinand, A.,Markmann, J.,Sharp, M.,Eckerlebe, H.,Kohlbrecher, J.,Birringer, R. %D 2008 %J Europhysics Letters %N 6 %P 66003 %R doi:10.1209/0295-5075/81/66003 %T Spin structure of nanocrystalline gadolinium %U https://doi.org/10.1209/0295-5075/81/66003 6 %X We report on magnetic-field–dependent small-angle neutron scattering (SANS) experiments on nanocrystalline inert-gas condensed bulk Gd, which was synthesized using the low-capturing isotope 160Gd. The angular dependency of the scattering cross-section is in very good agreement with recent theoretical predictions. Rather unexpected for this type of material, we observe a "clover-leaf–shaped" anisotropy in the SANS signal, the origin of which is attributed to the existence of longitudinal magnetization fluctuations associated with atomic site disorder and modified coupling inside the defect cores of grain boundaries. %0 journal article %@ 0255-5476 %A Martins, R.M.S.,Schell, N.,Beckers, M.,Muecklich, A.,Reuther, H.,Silva, R.J.C.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2008 %J Materials Science Forum, Advanced Materials Forum IV %N %P 820-823 %R doi:10.4028/www.scientific.net/MSF.587-588.820 %T The interfacial diffusion zone in magnetron sputtered Ni-Ti thin films deposited on different Si substrates studied by HR-TEM %U https://doi.org/10.4028/www.scientific.net/MSF.587-588.820 %X Ni-Ti Shape Memory Alloy thin films are suitable materials for microelectromechanical devices. During the deposition of Ni-Ti thin films on Si substrates, there exist interfacial diffusion and chemical interactions at the interface due to the high temperature processing necessary to crystallize the film. For the present study, Ni-Ti thin films were prepared by magnetron cosputtering from Ni-Ti and Ti targets in a specially designed chamber mounted on the 6-circle,goniometer of the ROssendorf BeamLine (ROBL-CRG) at ESRF, Grenoble (France). The objective,of this study has been to investigate the interfacial structure resulting from depositions (at a temperature of ≈ 470°C) on different substrates: naturally oxidized Si(100), Si(111) and poly-Si substrates. A detailed High-Resolution TEM analysis of the interfacial structure has been performed. When Ni-Ti is deposited on Si(100) substrate, a considerable diffusion of Ni into the substrate takes place, resulting in the growth of semi-octaeder A-NiSi2 silicide. In the case of Ni-Ti deposited on Si(111), there appears an uniform thickness plate, due to the alignment between substrate orientation and the [111]-growth front. For Ni-Ti deposited on poly-Si, the diffusion is,inhomogeneous. Preferential diffusion is found along the columnar grains of poly-Si, which are favourably aligned for Ni diffusion. These results show that for the Ni-Ti/Si system, the morphology,of the diffusion interface is strongly dependent on the type of substrates. %0 journal article %@ 0924-7963 %A Onken, R.,Alvarez, A.,Fernandez, V.,Vizoso, G.,Basterretxea, G.,Tintore, J.,Haley, P.,Nacini, E. %D 2008 %J Journal of Marine Systems %N 1-2 %P 79-98 %R doi:10.1016/j.jmarsys.2007.05.008 %T A forecast experiment in the Balearic Sea %U https://doi.org/10.1016/j.jmarsys.2007.05.008 1-2 %X A forecast experiment in the Balearic Sea is presented which is based on the Harvard Ocean Prediction System (HOPS). HOPS is modular, containing a high-resolution primitive equations model, packages for objective analysis and data assimilation (Optimum Interpolation), an interface to implement atmospheric forcing and another interface for one-way nesting of HOPS into any other larger-scale circulation model. Here, to prevent false advection from open boundaries, HOPS is nested into the basin-scale DieCAST model [Dietrich, D.E., Haney, R.L., Fernández, V., Josey, S.A., Tintoré, J., 2004. Air–sea fluxes based on observed annual cycle surface climatology and ocean model internal dynamics: a non-damping zero-phase-lag approach applied to the Mediterranean Sea. J. Mar. Syst., 52, 145–165] and atmospheric forcing fields were provided in terms of HIRLAM fields by the Spanish National Institute of Meteorology.,The forecast capability of HOPS is demonstrated in terms of a hindcast experiment, utilising two observational data sets of a subregion of the Balearic Sea which were acquired in mid September and early October 2002. While the data of the first survey is used for model initialisation, that of the second survey serves for validation of the forecast products. The forecast skill of the system is evaluated quantitatively by three different objective methods, comparing the rms difference of vertical profiles and horizontal fields, and pattern correlations, both for temperature and salinity. In five out of six cases, the forecasted fields are closer to the validation data set than the fields used for initialisation, i.e. the forecast beats persistence and the forecast is successful.,Taking into account further available options of HOPS (implementation of additional tracers, tracking of Lagrangian particles, biological modules, two-way nesting), the system is operational for a wide field of possible applications. %0 conference paper %@ %A Martins, R.M.S.,Schell, N.,Beckers, M.,Muecklich, A.,Reuther, H.,Silva, R.J.C.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2008 %J SMST-2006, Proceedings of the International Conference on Shape Memory and Superelastic Technologies %N %P 363-372 %T In-situ study of the preferential orientation of magnetron sputtered Ni-Ti thin films as a function of bias and substrate type %U %X %0 journal article %@ 0947-8396 %A Martins, R.M.S.,Schell, N.,Muecklich, A.,Reuther, H.,Beckers, M.,Silva, R.J.C.,Pereira, L.,Braz Fernandes, F.M. %D 2008 %J Applied Physics A %N 2 %P 291-299 %R doi:10.1007/s00339-008-4397-2 %T Study of graded Ni-Ti shape memory alloy film growth on Si(100) substrate %U https://doi.org/10.1007/s00339-008-4397-2 2 %X In-situ X-ray diffraction (XRD) was employed to study the effect of the deliberate change of the Ti/Ni ratio during the deposition of Ni-Ti films. Thus, graded films were deposited exhibiting distinctive composition and crystalline structure along the growth direction. The as-sputtered films were ex-situ characterized by Auger electron spectroscopy (AES), cross-sectional transmission electron microscopy (XTEM), and electrical resistivity (ER) measurements (during thermal cycling). In this paper results are presented concerning a film (thickness of ≈ 420 nm) with a Ti-rich composition in the central part (ranging from 50 to ≈60 at. %) and near-equiatomic composition in the extremities, following four distinct deposition periods (different Ti target powers). During the initial deposition step (near-equiatomic composition) the Ni-Ti B2 phase starts by stacking onto (h00) planes on the naturally oxidized Si(100) substrate due to the presence of the native Si oxide (2–3 nm). The increase of the power of the Ti target in the second and third steps induced the precipitation of Ti2Ni. When stopping the Ti co-sputtering, Ti2Ni dissolves and, thus, plays the role of a Ti reservoir for the formation of B2 phase now preferentially stacking onto (110) with the system approaching again the equiatomic composition. The ex-situ study of the morphology of the interface has shown the presence of NiSi2 silicides (A-NiSi2 and B-NiSi2), Ti4Ni4Si7, Ti2Ni and a non-identified phase constituted by Ni, Ti and Si, most likely amorphous. During thermal cycling, ER measurements revealed phase transitions associated with the B2, R-phase and B19′ phases. These type of studies allow the identification of intermediate states during deposition and annealing, and the correlation with the final structure of the film, being useful for the optimisation of the deposition parameters in order to fabricate films with a two-way reversible actuation. %0 journal article %@ 0921-5093 %A Martins, R.M.S.,Schell, N.,Beckers, M.,Silva, R.J.C.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2008 %J Materials Science and Engineering A %N %P 626-629 %R doi:10.1016/j.msea.2006.12.225 %T Role of the substrate on the growth of Ni–Ti sputtered thin films %U https://doi.org/10.1016/j.msea.2006.12.225 %X Ni–Ti thin films have been recognized as promising and high performance materials in the field of microelectromechanical system applications. However, important issues like formation of film texture and its control are still unresolved. Widening the scope of previous experiments concerning the influence of the deposition parameters on the Ni–Ti films structure, here we show how different crystallographic orientations can be obtained by changing the substrate type. The growth of near-equiatomic Ni–Ti films, deposited by magnetron co-sputtering from Ni–Ti and Ti targets on heated substrates (≈470 °C), has been studied in situ by X-ray diffraction at a synchrotron radiation beamline. As mentioned in other studies for depositions on Si100, a 1 1 0 fiber texture is observed for the B2 phase. However, a preferential stacking of 1 0 0 planes of the B2 phase parallel to the film surface was observed when using a MgO100 substrate. The preferential orientation of B2100||MgO100 was very strong and was kept as such until the end of the deposition, which lasted for 7.2 ks (≈900 nm). Ni–Ti films were also deposited on a TiN layer (≈15 nm) previously deposited on top of a SiO2/Si100 substrate. In this case, a crossover from 1 1 0 oriented grains dominating at small thicknesses, to 2 1 1 oriented grains taking over at larger thicknesses was observed. These are promising results concerning the manipulation of the crystallographic orientations of Ni–Ti thin films, since the texture has a strong influence on the extent of the strain recovery. %0 journal article %@ 0255-5476 %A Martins, R.M.S.,Schell, N.,Reuther, H.,Pereira, L.,Silva, R.J.C.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2008 %J Materials Science Forum, Advanced Materials Forum IV %N %P 672-676 %R doi:10.4028/www.scientific.net/MSF.587-588.672 %T Characterization of Ni-Ti (Shape memory alloy) thin film by in-situ XRD and complementary ex-situ techniques %U https://doi.org/10.4028/www.scientific.net/MSF.587-588.672 %X Ni-Ti SMA are smart materials undergoing first order martensitic transformations driven by temperature and/or stress. In the form of film they are very attractive candidates for microelectro-,mechanical system (MEMS) applications. Future directions include the production of functionally graded films by changing deliberately the ratio Ti/Ni across their thickness. However, for the successful development of this type of films, it is important to characterize, model and control the variations in composition, crystalline structure and transformation temperatures. Our approach is in-situ XRD study of the actual growth of the films of varying composition along the thickness carried out using a deposition chamber installed at a synchrotron radiation beamline.,These studies were complemented with ex-situ analysis techniques. The results achieved on a Ni-Ti film co-sputtered from Ni-Ti and Ti targets on a TiN buffer layer are presented in this paper. The deposition started by using optimised parameters for a near equiatomic composition. After 1 h (≈330 nm thick film), the Ti power was increased from 20 to 25W, leading to the precipitation of,Ti2Ni. The evolution of the lattice parameter values of the B2 phase, calculated from the corresponding XRD data, is clearly linked with the increase of the Ti power. The depth profile of the atomic concentrations determined by Auger Electron Spectroscopy (AES) is in agreement with the in situ XRD results. The temperature dependence of the electrical resistivity was used to monitor phase transformations, Scanning Electron Microscopy (SEM) has shown the presence of twinned martensite on the film’s surface at room temperature. %0 journal article %@ 0022-3115 %A Bergner, F.,Ulbricht, A.,Hernandez-Mayoral, M.,Pranzas, P.K. %D 2008 %J Journal of Nuclear Materials %N 1-2 %P 334-337 %R doi:10.1016/j.jnucmat.2007.07.008 %T Small-angle neutron scattering study of neutron-irradiated iron and an iron–nickel alloy %U https://doi.org/10.1016/j.jnucmat.2007.07.008 1-2 %X The nature of irradiation-induced features in Fe–3wt%Ni was investigated by means of small-angle neutron scattering and hardness measurements and compared with results for commercially pure Fe. We have observed a three times larger volume fraction of irradiation-induced scatterers for the Fe–Ni alloy than for pure Fe. A vacancy–Ni ratio of 0.4–0.5 was deduced for the average scatterer. This finding is consistent with the hardness increase observed. %0 journal article %@ 1431-9276 %A Martins, R.M.S.,Muecklich, A.,Schell, N.,Silva, R.J.C.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2008 %J Microscopy and Microanalysis %N S 3 %P 85-86 %R doi:10.1017/S1431927608089460 %T Characterization of Sputtered Shape Memory Alloy Ni-Ti Films by Cross-sectional TEM and SEM %U https://doi.org/10.1017/S1431927608089460 S 3 %X Ni-Ti Shape Memory Alloys (SMAs) have been attracting attention as smart materials because they can work as sensors and actuators at the same time. Miniaturization of mechanical devices is evolving toward sub-micron dimensions raising important questions in the properties of Ni-Ti films. In thin films it is essential to investigate the microstructure to understand the origin of the thickness limit. The design of functionally graded films has also been considered but for their successful development it is important to characterize the variations in crystalline structure. %0 journal article %@ 0925-8388 %A Friedrichs, O.,Kolodziejczyk, L.,Sanchez-Lopez, J.C.,Fernandez, A.,Lyubenova, L.,Zander, D.,Koester, U.,Aguey-Zinsou, K.F.,Klassen, T.,Bormann, R. %D 2008 %J Journal of Alloys and Compounds %N 1-2 %P 539-545 %R doi:10.1016/j.jallcom.2007.09.085 %T Influence of particle size on electrochemical and gas-phase hydrogen storage in nanocrystalline Mg %U https://doi.org/10.1016/j.jallcom.2007.09.085 1-2 %X Nanocrystalline Mg powders of different particle size were obtained by inert gas evaporation and studied during electrochemical and gas-phase hydrogen cycling processes. The samples were compared to dehydrided samples obtained by mechanical milling of MgH2 with and without 2 mol% Nb2O5 as catalyst. The hydrogen overpotential of the pure Mg, which is a measure of the hydrogen evolution at the electrode surface, was observed to be reduced with smaller particle sizes reaching values comparable to samples with Nb2O5 additive. On the other hand gas-phase charging experiments showed the capacity loss with smaller particle sizes due to oxidation effects. These oxidation effects are different depending on the synthesis method used and showed a major influence on the hydrogen sorption kinetics. %0 conference lecture %@ %A Santos, C.,Franke, R.-P.,Almeida, M.M.,Costa, M.E.V.,Fernandes, M.H. %D 2008 %J TERMIS-EU 2008 Meeting %N %P %R doi:10.1089/tea.2008.1504 %T Behaviour of osteoblastic-like MG-63 cells cultured with hydroxyapatite and biphasic (Hap/beta-Tcp) porous granules %U https://doi.org/10.1089/tea.2008.1504 %X %0 conference object %@ 1937-3341 %A Santos, C.,Franke, R.-P.,Almeida, M.M.,Costa, M.E.V.,Fernandes, M.H. %D 2008 %J Tissue Engineering A %N 5 %P 810 %R doi:10.1089/tea.2008.1504 %T Behaviour of osteoblastic-like MG-63 cells cultured with hydroxyapatite and biphasic (Hap/beta-Tcp) porous granules %U https://doi.org/10.1089/tea.2008.1504 5 %X No abstract %0 journal article %@ 0257-8972 %A Kannan, M.B.,Gomes, D.,Dietzel, W.,Abetz, V. %D 2008 %J Surface and Coatings Technology %N 19 %P 4598-4601 %R doi:10.1016/j.surfcoat.2008.03.027 %T Polyoxadiazole-based coating for corrosion protection of magnesium alloy %U https://doi.org/10.1016/j.surfcoat.2008.03.027 19 %X In this study, polyoxadiazole-based coatings were molecularly designed by attaching two different functional groups, i.e., diphenyl-ether and diphenyl-hexafluoropropane, in the main polymer chain for the purpose of low water permeability and eventually for high corrosion protection of AM50 magnesium alloy. Potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) were used to evaluate the coating performance of the two polymers. Electrochemical experiments showed that POD-6FP (poly(4,4′-diphenyl-hexafluoropropane-1,3,4-oxadiazole)) coated alloy exhibited 3–4 orders of magnitude higher corrosion resistance as compared to the POD-DPE (poly (4,4′-diphenyl-ether-1,3,4-oxadiazole)) coated alloy. The high coating performance of the POD-6FP polymer can be attributed to the hydrophobic group attached to the polyoxadiazole chain. %0 journal article %@ 1662-0356 %A Braz Fernandes, F.M.,Martins, R.M.S.,Schell, N.,Mahesh, K.K.,Silva, E.J.C. %D 2008 %J Advances in Science and Technology, State-of-the-art Research and Application of SMAs Technologies %N %P 69-76 %R doi:10.4028/www.scientific.net/AST.59.69 %T Texture development in Ni-Ti thin films %U https://doi.org/10.4028/www.scientific.net/AST.59.69 %X %0 journal article %@ 0921-5093 %A Kannan, M.B.,Dietzel, W.,Blawert, C.,Atrens, A.,Lyon, P. %D 2008 %J Materials Science and Engineering A %N 1-2 %P 529-539 %R doi:10.1016/j.msea.2007.07.070 %T Stress corrosion cracking of rare-earth-containing magnesium alloys ZE41, QE22 and Elektron 21 (EV31A) compared with AZ80 %U https://doi.org/10.1016/j.msea.2007.07.070 1-2 %X Stress corrosion cracking (SCC) of the high-performance rare-earth containing magnesium alloys ZE41, QE22 and Elektron 21 (EV31A) was studied using slow strain rate tests (SSRT) in air, distilled water and 0.5 wt.% NaCl solution. For comparison, the well known AZ80 alloy was also studied. All the four alloys (AZ80, ZE41, QE22 and EV31A) were susceptible to SCC in 0.5wt.% NaCl solution and distilled water. AZ80,had similar SCC susceptibility in distilled water and 0.5 wt.% NaCl solution. ZE41, QE22 and EV31A had higher susceptibility to SCC in 0.5 wt.% NaCl solution than in,distilled water. EV31A had the highest resistance to SCC compared to AZ80, ZE41 and QE22 in both distilled water and 0.5 wt.% NaCl solution. The fractography was,consistent with (i) largely transganular SCC (TGSCC) in distilled water for AZ80, ZE41and QE22 and also for AZ80 in 0.5 wt.% NaCl solution, and (ii) a significant component of intergranular SCC (IGSCC) in 0.5 wt.% NaCl solution for QE22, ZE41and EV31A. The TGSCC fracture path in AZ80, ZE41 and QE22 is consistent with a mechanism involving hydrogen. In each case, the IGSCC appeared to be associated with the second phase particles along grain boundaries. For IGSCC of EV31A and QE22, the fractography was consistent with micro-galvanic acceleration of the,corrosion of alpha-magnesium by the second phase particles, whereas it appeared that the second phase particles had corroded itself in the case of ZE41 in 0.5 wt.% NaCl,solution. The study suggests that rare earth elements in magnesium alloys can improve SCC resistance significantly as observed in the case of EV31A. However, the SCC,resistance also depends on the other critical alloying elements such as zinc (in ZE41) and silver (in QE22) and the microstructure. %0 journal article %@ 0921-5093 %A Kannan, M.B.,Dietzel, W.,Blawert, C.,Riekehr, S.,Kocak, M %D 2007 %J Materials Science and Engineering A %N 1-2 %P 220-226 %R doi:10.1016/j.msea.2006.08.075 %T Stress corrosion cracking behavior of Nd:YAG laser butt welded AZ31 Mg sheet %U https://doi.org/10.1016/j.msea.2006.08.075 1-2 %X In this study, the stress corrosion cracking (SCC) behavior of samples fabricated from AZ31 Mg alloy by laser butt welding was investigated,in slow strain rate tensile (SSRT) and constant load tests. The results show that the laser butt welded AZ31 Mg samples are highly susceptible to,SCC. The failure of the samples occurred in the fusion boundary when tested in corrosion environment in contrast to failures in the fusion zone,(FZ)/base region observed for tests in air. It is suggested that weakening of the fusion boundary is due to the localized corrosion attack along the,region. %0 journal article %@ 0360-3199 %A Ares Fernandez, J.R.,Aguey-Zinsou, F.,Elsaesser, M.,Ma, X.Z.,Dornheim, M.,Klassen, T.,Bormann, R. %D 2007 %J International Journal of Hydrogen Energy %N 8 %P 1033-1040 %R doi:10.1016/j.ijhydene.2006.07.011 %T Mechanical and thermal decomposition of LiAlH4 with metal halides %U https://doi.org/10.1016/j.ijhydene.2006.07.011 8 %X In the present paper, we investigate the thermal and mechanical decomposition of lithium alanate (LiAlH4) milled with different metal-halides (VCl3, VBr3 and AlCl3). We observed that the thermal decomposition temperature of LiAlH4 does not depend on the metal–halide and it is decreased by 25°C as compared to LiAlH4 without additives. Moreover, metal halides enhance the decomposition of LiAlH4 and Li3AlH6. The ability of the metal halides to decompose LiAlH4 and Li3AlH6 during milling follows the order: VCl3>VBr3>AlCl3. X-ray diffraction and IR spectroscopy did not allow detecting any change on the cell volume or on Al–H bond of the doped alanate suggesting that the additives seem to do not act as substitutes into the lattice of the alanate. %0 journal article %@ 1359-6462 %A Kannan, M.B.,Dietzel, W.,Singh Raman, P.K.,Lyon, P. %D 2007 %J Scripta Materialia %N 7 %P 579-581 %R doi:10.1016/j.scriptamat.2007.06.019 %T Hydrogen-induced-cracking in magnesium alloy under cathodic polarisation %U https://doi.org/10.1016/j.scriptamat.2007.06.019 7 %X The hydrogen-induced-cracking (HIC) behaviour of the magnesium alloy AZ80 was evaluated using the slow strain rate testmethod. The study shows no evidence of HIC in AZ80 alloy after pre-exposure and pre-charging conditions in distilled water. However, under continuous charging in distilled water during straining, the AZ80 alloy shows evidence of HIC. The contradiction,reported in the literature is addressed. %0 journal article %@ 0925-8388 %A Ares Fernandez, J.R.,Aguey-Zinsou, K.-F.,Klassen, T.,Bormann, R. %D 2007 %J Journal of Alloys and Compounds %N %P 729-733 %R doi:10.1016/j.jallcom.2006.08.132 %T Influence of impurities on the milling process of MgH2 %U https://doi.org/10.1016/j.jallcom.2006.08.132 %X Mechanical milling (MM) is an useful technique to improve the H-kinetics of magnesium hydride (MgH2) by crystallite and particle size reduction. In the present work, we report the significant influence of impurities coming from the milling tools on magnesium H-sorption properties. We have observed that a high impurity level leads to powder agglomeration and subsequently, it prevents an efficient reduction of MgH2 particle size. Therefore, a drawback in H-sorption properties is observed. Finally, a short outlook about the influence of impurities on desorption temperature of MgH2 milled with different additives (metal-oxides) will be presented. %0 journal article %@ 0921-5093 %A Kannan, M.B.,Dietzel, W.,Zeng, R.,Zettler, R.,dos Dantos, J. %D 2007 %J Materials Science and Engineering A %N %P 243-250 %R doi:10.1016/j.msea.2007.01.065 %T A study on the SCC susceptibility of friction stir welded AZ31 Mg sheet %U https://doi.org/10.1016/j.msea.2007.01.065 %X In this study, the stress corrosion cracking (SCC) behavior of friction stir welded (FSW) AZ31 Mg alloy was examined using slow strain rate tensile (SSRT) test method.,Electrochemical impedance spectroscopy (EIS) and salt spray tests were carried to understand the general corrosion behavior. The FSW AZ31 Mg samples exhibited higher,SCC susceptibility than the base material during SSRT in corrosive environment. The failure of the FSW AZ31 Mg samples occurred in the stir zone (SZ) when tested in corrosive environment, in contrast to the failure in the thermo mechanically affected zone (TMAZ) observed in tests in air. However, the EIS and salt spray test results showed a higher general corrosion resistance of the SZ than the base material. The study suggests that hydrogen assisted cracking could be a reason for the higher SCC susceptibility of FSW,AZ31 Mg samples than the base material. %0 journal article %@ 0148-0227 %A Fernandez, J.,Montavez, J.,Saez, J.,Gonzalez-Rouco, F.,Zorita, E. %D 2007 %J Journal of Geophysical Research : Atmospheres %N D 04 %P D04101 %R doi:10.1029/2005JD006649 %T Sensitivity of the MM5 mesoscale model to physical parameterizations for regional climate studies: Annual cycle %U https://doi.org/10.1029/2005JD006649 D 04 %X We present an analysis of the sensitivity of a high-resolution integration of the MM5 mesoscale model over the Iberian Peninsula to different physical parameterizations. Several (16) five-year runs of the MM5 model with varying parameterizations have been carried out and the results have been,extensively compared with observational precipitation and surface temperature data. Less systematic tests were conducted to compare the parameterization,uncertainty with that induced by the boundary conditions and the,observational uncertainty. No parameterization combination was found to perform best for simulating both precipitation and surface temperature in every season and subregion of the Iberian Peninsula. The Kain–Fritsch cumulus,scheme was found to simulate unrealistically high summer precipitation, while the radiation parameterizations tested were found to have little impact on our target variables. Other factors, such as the choice of boundary conditions were found to have an impact on the results as large as the selection of parameterizations. The uncertainty in the MM5 ensemble is of the same order of magnitude as the observational uncertainty, except in summer. %0 conference poster %@ %A Recio, R.,Pradanos, P.,hernandez, A.,Shishatskiy, S.,Peinemann, K.-V.,Bottino, A.,Capannelli, G. %D 2007 %J New Materials for Membranes, Marie Curie Training and Conferences on Membrane Technology %N %P %T Asymmetric membranes for gas separation. Different techniques to determine the active dense skin thickness %U %X %0 journal article %@ 0008-6363 %A Padmasekar, M.,Nandigma, R.,Wartenberg, M.,Schlueter, K.-D.,Sauer, H. %D 2007 %J Cardiovascular Research %N 1 %P 118-128 %R doi:10.1016/j.cardiores.2007.03.003 %T The acute phase protein Alpha2-macroglobullin induces rat ventricular cardiomyocyte hypertrophy via ERK1,2 and PI3-kinase/Akt pathways %U https://doi.org/10.1016/j.cardiores.2007.03.003 1 %X Alpha2-macroglobulin (α2M) is an acute phase protein released to the serum upon challenges such as cardiac hypertrophy and infarction. Here we report on the role of α2M in the induction of hypertrophic cell growth, contractile responsiveness of rat ventricular cardiomyocytes, and on the underlying extracellular regulated kinase 1,2 (ERK1,2) and phosphoinositide 3-kinase (PI3-kinase)/Akt pathways. %0 journal article %@ 0360-3199 %A Aguey-Zinsou, K.-F.,Ares Fernandez, J.,Klassen, T.,Bormann, R. %D 2007 %J International Journal of Hydrogen Energy %N 13 %P 2400-2407 %R doi:10.1016/j.ijhydene.2006.10.068 %T Effect of Nb2O5 on MgH2 properties during mechanical milling %U https://doi.org/10.1016/j.ijhydene.2006.10.068 13 %X Recently, it was shown that hydrogen absorption–desorption kinetics in magnesium were improved by milling magnesium hydride (MgH2) with transition metal oxides. Herein, we investigate the role of the most effective of these oxides, Nb2O5 when added in larger volume fraction. The effect of Nb2O5 on magnesium crystalline structure, particle size and (ab)desorption properties has been characterised. Moreover, we report that pure MgH2 can also show fast hydrogen sorption kinetics after a long milling time. The effects of Nb2O5 on MgH2 sorption properties are rationalised in a new approach considering Nb2O5 as a dispersing agent, which helps reduce MgH2 particle size during milling. %0 journal article %@ 0021-8898 %A Pranzas, P.K.,Dornheim, M.,Boesenberg, U.,Ares Fernandez, J.R.,Goerigk, G.,Roth, S.V.,Gehrke, R.,Schreyer, A. %D 2007 %J Journal of Applied Crystallography %N S1 %P S 383-S 387 %R doi:10.1107/S0021889807008023 %T Small-angle scattering investigations of magnesium hydride used as a hydrogen storage material %U https://doi.org/10.1107/S0021889807008023 S1 %X In this work, high-energy ball-milled magnesium hydride samples used for,hydrogen storage are investigated using small- and ultra-small-angle neutron scattering (SANS) as well as small-angle X-ray scattering (SAXS). Size distributions of inhomogeneities with dimensions from 10 A ˚ up to more than 10 mm, corresponding to crystallite and particle sizes obtained by X-ray diffraction and electron microscopy, are determined as a function of milling time, milling tool material and added metal oxide catalysts in order to study the influence of the microstructure on the sorption kinetics. Significant changes of the volume fraction distributions are found for samples containing the catalyst chromium oxide, particularly when the catalyst particles are nanometre-sized.,Cr2O3 is an effective agent for breaking up particles during the milling process. The comparison of SANS and SAXS curves give some of the first information about the distribution of hydrogen-containing structures. Using anomalous small-angle X-ray scattering, an energy-dependent scattering is found for an,MgHx sample with 1 mol% Fe2O3. From the separated scattering curve a size distribution of hard spheres is obtained with a size range which is expected for crystallite and particle sizes of the Fe2O3 catalyst. Chemical shifts in the absorption spectra give information about the stability of the metal oxide catalysts during the milling process. %0 journal article %@ 0954-0083 %A Zolotukhin, M.G.,Fomine, S.,Lazo, L.M.,Gutierrez Hernandez, M.del C.G.,Guzman-Gutierrez, M.T.,Ruiz-Trevino, A.,Fritsch, D.,Cuellas, D.C.,Fernandez-G, J.M. %D 2007 %J High Performance Polymers %N 5 %P 638-648 %R doi:10.1177/0954008307081204 %T A Novel Approach to the Synthesis of High Performance and Functional Polymers %U https://doi.org/10.1177/0954008307081204 5 %X A novel series of linear, high molecular weight high performance and functional polymers were synthesized by a one-pot, superacid-catalyzed polyhydroxylakylation reaction of carbonyl compounds containing electron-withdrawing substituents, adjacent or relatively close to a carbocation center with non-activated aromatic hydrocarbons. The reactions were performed at room temperature in the Brønsted superacid CF3SO3H (trifluoromethanesulfonic acid, TFSA) and in a mixture of TFSA with methylene chloride, which was used as both solvent and a medium for generation of electrophilic species from the carbonyl component. Polycondensations of 1,1,1-trifluoroacetone, 2,2,2-trifluoroacetohenone, 2,7-dinitrofluorenone, acenaphthenequinone and isatin with aromatic hydrocarbons proceed readily in the presence of superacid at room temperature. The polymers obtained were found to be soluble in the common organic solvents, and flexible transparent films could be cast from the solutions. 1H and 13C NMR analyses of the polymers synthesized revealed their linear, highly regular structure. The polymers also possess high thermostability. %0 journal article %@ 0925-4005 %A Martins, R.M.S.,Schell, N.,Silva, R.J.C.,Pereira, L.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2007 %J Sensors and Actuators B %N 1 %P 332-337 %R doi:10.1016/j.snb.2006.12.052 %T In-situ study of Ni–Ti thin film growth on a TiN intermediate layer by X-ray diffraction %U https://doi.org/10.1016/j.snb.2006.12.052 1 %X Shape Memory Alloy (SMA) Ni–Ti thin films have attracted much interest as functional and smart materials due to their unique properties. However, there are still important issues unresolved like formation of film texture and its control as well as substrate effects. In this study, near-equiatomic films were obtained by co-sputtering from Ni–Ti and Ti targets in a process chamber installed at a synchrotron radiation beamline. In-situ X-ray diffraction during the growth of these films allowed establishing a relationship between structure and deposition parameters. The effect of a TiN layer deposited on top of the SiO2/Si(1 0 0) substrate prior to the deposition of the Ni–Ti films was analysed. These experiments show that TiN acts not only as a diffusion barrier, but also induces different crystallographic orientations. A TiN layer with ≈215 nm thickness induces the preferential growth of (1 1 0) planes of the Ni–Ti B2 phase parallel to the substrate from the beginning of the deposition with a constant growth rate during the whole deposition. For a TiN thickness of ≈15 nm, the diffraction peak B2(1 1 0) also appears from the beginning of the deposition but much less intense. In this latter case, the B2(2 1 1) peak was also detected having observed a crossover from left angle bracket1 1 0right-pointing angle bracket oriented grains dominating at small thicknesses, to left angle bracket2 1 1right-pointing angle bracket oriented grains taking over at larger thicknesses. The same orientations and similar intensities were observed for a Ni–Ti film deposited on a TiN layer with ≈80 nm. %0 journal article %@ 0925-8388 %A Aguey-Zinsou, K.-F.,Nicolaisen, T.,Ares-Fernandez, J.R.,Klassen, T.,Bormann, R. %D 2007 %J Journal of Alloys and Compounds %N %P 738-742 %R doi:10.1016/j.jallcom.2006.08.137 %T Effect of nanosized oxides on MgH2 (de)hydriding kinetics %U https://doi.org/10.1016/j.jallcom.2006.08.137 %X The kinetics of hydrogen absorption and desorption (H-sorption) in magnesium have been improved by mechanically milling magnesium hydride (MgH2) with metal oxides (MxOy). Here, we investigate the effect of initial particle size of the oxides on the H-sorption properties of magnesium. As mechanical milling is regarded as an efficient method to break and disperse catalytic particles of MxOy, nanosized MxOy should allow shorter milling times and improved hydrogen kinetics (H-kinetics) compared to microsized MxOy. Our results show that the fastest kinetics can mostly be achieved, independent of initial particle size of the oxides. In some cases, milling time can be shortened to achieve this, while in other cases, nanosized MxOy does not lead to the expected improvement of magnesium H-sorption properties. The results are rationalised in a new frame considering MxOy as process controlling agent helping to refine MgH2 particle size during milling. %0 journal article %@ 0889-3667 %A Wright, A.,Aguilar Soto, N.,Baldwin, A.L.,Bateson, M.,Beale, C.M.,Clark, C.,Deak, T.,Edwards, E.F.,Fernansez Rodrigues, A.,Godinho, A.,Hatch, L.,Kakuschke, A.,Lusseau, D.,Martineau, D.,Romero, L.M.,Weilgart, L.,Wintle, B.,Notarbartolo di Sciara, G.,Martin, V. %D 2007 %J International Journal of Comparative Psychology %N %P 250-273 %T Anthropogenic Noise as a Stressor in Animals: A Multidisciplinary Perspective %U %X Consequences of extreme noise exposure are obvious and usually taken into some consideration in,the management of many human activities that affect either human or animal populations. However,,the more subtle effects such as masking, annoyance and changes in behavior are often overlooked,,especially in animals, because these subtleties can be very difficult to detect. To better understand the,possible consequences of exposure to noise, this review draws from the available information on human and animal physiology and psychology, and addresses the importance of context (including physiological and psychological state resulting from any previous stressor exposure) in assessing the true meaning of behavioral responses. The current consensus is that the physiological responses to stressors of various natures are fairly stereotyped across the range of species studied. It is thus,expected that exposure to noise can also lead to a physiological stress response in other species either,directly or indirectly through annoyance, a secondary stressor. In fact many consequences of exposure to noise can result in a cascade of secondary stressors such as increasing the ambiguity in received signals or causing animals to leave a resourceful area, all with potential negative if not disastrous consequences. The context in which stressors are presented was found to be important not only in affecting behavioral responses, but also in affecting the physiological and psychological,responses. Young animals may be particularly sensitive to stressors for a number of reasons including,the sensitivity of their still-developing brains. Additionally, short exposure to stressors may result in,long-term consequences. Furthermore, physiological acclimation to noise exposure cannot be,determined from apparent behavioral reactions alone due to contextual influence, and negative,impacts may persist or increase as a consequence of such behavioral changes. Despite the lack of,information available to managers, uncertainty analysis and modeling tools can be coupled with,adaptive management strategies to support decision making and continuous improvements to,managing the impacts of noise on free-ranging animals. %0 journal article %@ 0889-3667 %A Wright, A.,Aguilar Soto, N.,baldwin, A.L.,Bateson, M.,Beale, C.M.,Clark, C.,Deak, T.,Edwards, E.F.,Fernandez Rodrigues, A.,Godinho, A.,Hatch, L.,Kakuschke, A.,Lusseau, D.,Martineau, D.,Romero, L.M.,Weilgart, L.,Wintle, B.,Notarbartolo di Sciara, G.,Martin, V. %D 2007 %J International Journal of Comparative Psychology %N %P 274-316 %T Do Marine Mammals Experience Stress Related to Anthropogenic Noise? %U %X Sound travels much further than light in the marine environment. As a result, marine mammals, especially cetaceans, rely heavily on sound for many important life functions, including breeding and foraging. This reliance on sound means it is quite likely that exposure to noise will have some detrimental effects on these life functions. However, there has been little application to marine,mammals of the knowledge available in other species of stress responses to noise and other stressors. In this paper we begin to integrate what is known about marine mammals with the current knowledge gained in terrestrial mammals about stress physiology, specifically considering physiological and psychological context and thus also cumulative and synergistic impacts. We determined that it is reasonable to extrapolate information regarding stress responses in other species to marine mammals, because these responses are highly conserved among all species in which they have been examined to date. As a result, we determined that noise acts as a stressor to marine mammals. Furthermore, given that marine mammals will likely respond in a manner consistent with other species studied, repeated and prolonged exposures to stressors (including or induced by noise) will be problematic for marine mammals of all ages. A range of issues may arise from the extended stress response including, but not limited to, suppression of reproduction (physiologically and behaviorally), accelerated aging and,sickness-like symptoms. We also determined that interpretation of a reduction in behavioral responses to noise as acclimation will be a mistake in many situations, as alternative reasons for the observed results are much more likely. We recommend that research be conducted on both stress responses and life-history consequences of noise exposure in marine mammals, while emphasizing,that very careful study designs will be required. We also recommend that managers incorporate the findings presented here in decisions regarding activities that expose marine mammals to noise. In particular, the effects of cumulative and synergistic responses to stressors can be very important and should not be dismissed lightly. %0 conference poster %@ %A Padmaskar, M.,Nandigama, R.,Wartenberg, M.,Sauer, H. %D 2006 %J Jahrestagung der Deutschen Physiologischen Gesellschaft %N %P %T The acute phase protein alpha-2 macroglobulin induces hypertrophy in rat ventricular cardiomyocytes %U %X %0 journal article %@ 0021-9258 %A Nandigama, R.,Padmasekar, M.,Wartenberg, M.,Sauer, H. %D 2006 %J The Journal of Biological Chemistry : JBC %N 9 %P 5686-5693 %R doi:10.1074/jbc.M510452200 %T Feed forward cycle of hypotonic stress-induced ATP release, purinergic receptor activation and growth stimulation of prostate cancer cells %U https://doi.org/10.1074/jbc.M510452200 9 %X ATP is released in many cell types upon mechanical strain, the physiological function of extracellular ATP is largely unknown, however. Here we report that ATP released upon hypotonic stress stimulated prostate cancer cell proliferation, activated purinergic receptors, increased intracellular [Ca2+]i, and initiated downstream signaling cascades that involved MAPKs ERK1/2 and p38 as well as phosphatidylinositol 3-kinase (PI3K). MAPK activation, the calcium response as well as induction of cell proliferation upon hypotonic stress were inhibited by preincubation with the ATP scavenger apyrase, indicating that hypotonic stress-induced signaling pathways are elicited by released ATP. Hypotonic stress increased prostaglandin E2 (PGE2) synthesis. Consequently, ATP release was inhibited by antagonists of PI3K (LY294002 and wortmannin), phospholipase A2 (methyl arachidonyl fluorophosphonate (MAFP)), cyclooxygenase-2 (COX-2) (indomethacin, etodolac, NS398) and 5,8,11,14-eicosatetraynoic acid (ETYA), which are involved in arachidonic acid metabolism. Furthermore, ATP release was abolished in the presence of the adenylate cyclase (AC) inhibitor MDL-12,330A, indicating regulation of ATP-release by cAMP. The hypotonic stress-induced ATP release was significantly blunted when the ATP-mediated signal transduction cascade was inhibited on different levels, i.e. purinergic receptors were blocked by suramin and pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid (PPADS), the Ca2+ response was inhibited upon chelation of intracellular Ca2+ by 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA), and ERK1,2 as well as p38 were inhibited by UO126 and SB203580, respectively. In summary our data demonstrate that hypotonic stress initiates a feed forward cycle of ATP release and purinergic receptor signaling resulting in proliferation of prostate cancer cells. %0 journal article %@ 1359-6454 %A Friedrichs, O.,Aguey-Zinsou, F.,Ares Fernandez, J.R.,Sanchez-Lopez, J.C.,Justo, A.,Klassen, T.,Bormann, R.,Fernandez, A. %D 2006 %J Acta Materialia %N %P 105-110 %R doi:10.1016/j.actamat.2005.08.024 %T MgH2 with Nb2O5 as additive, for hydrogen storage: Chemical, structural and kinetic behavior with heating %U https://doi.org/10.1016/j.actamat.2005.08.024 %X The influence of heating/cycling on MgH2 samples milled together with 2 mol% of Nb2O5 was investigated. X-ray diffraction (XRD) shows a reduction of the Nb2O5 to metallic niobium and a possible MgNb2O3.67 phase, along with an increased formation of MgO compared,to a pure MgH2 sample. It was shown that the additive during the heating process is preventing the MgH2 phase from grain growth. Using X-ray photoelectron spectroscopy metallic niobium and niobium oxides were observed emerging to the surface only after cycling. All reported reactions had taken place already during the first cycle. Using annealing experiments at different temperatures, samples of the same composition were generated but with different XRD crystal sizes. These samples showed similar sorption kinetics, which indicates that the prevention of grain growth by the Nb2O5 additive can only have a minor effect on the kinetics for this range of crystal sizes. Since the Nb2O5 is reduced during the heating, a possible catalytic effect has to be due to metallic Nb or those of its oxides with oxygen deficiency, like MgNb2O3.67, formed during the first cycle. However, other processes like particle size reduction or a decrease of agglomeration by the additive during milling also have to be taken into account. %0 journal article %@ 0169-4332 %A Friedrichs, O.,Sanchez-Lopez, J.C.,Lopez-Cartes, C.,Dornheim, m.,Klassen, T.,Bormann, R.,Fernandez, A. %D 2006 %J Applied Surface Science %N %P 2334-2345 %R doi:10.1016/j.apsusc.2005.04.018 %T Chemical and microstructural study of the oxygen passivation behaviour of nanocrystalline Mg and MgH2 %U https://doi.org/10.1016/j.apsusc.2005.04.018 %X Nanocrystalline Mg and MgH2 samples have been prepared by high-energy ball milling and gas phase condensation methods. Starting from these materials in their ‘‘as received’’ state without air exposure, a study of the oxygen and air passivation behaviour was carried out by ‘‘in situ’’ analysis of the samples by X-ray photoelectron spectroscopy (XPS) and transmission,electron microscopy (TEM). The binding energy and photoemission Auger parameters have been determined for metallic magnesium as well as for magnesium hydride, oxide and hydroxide species. Values of the MgH2 material were reported for the first time. The study clearly shows the formation of an oxide passivation layer of ca. 3–4 nm in thickness for all the nanocrystalline magnesium samples handled under controlled inert gas atmospheres. A hydroxide like amorphous layer is,formed at the topmost surface layers of the nanocrystalline Mg and MgH2 samples. The implication of these studies for H2 storage and transport applications of nanocrystalline magnesium is discussed. %0 journal article %@ 1359-6462 %A Friedrichs, O.,Klassen, T.,Sanchez-Lopez, J.S.,Bormann, R.,Fernandez, A. %D 2006 %J Scripta Materialia %N 7 %P 1293-1297 %R doi:10.1016/j.scriptamat.2005.12.011 %T Hydrogen sorption improvement of nanocrystalline MgH2 by Nb2O5 nanoparticles %U https://doi.org/10.1016/j.scriptamat.2005.12.011 7 %X The influence of Nb2O5 nanoparticles (15 nm) as an additive for mechanical milling on the hydrogen sorption kinetics of MgH2 was investigated. By using nanometric Nb2O5, a significant reduction of milling time (200 times shorter) with a decrease of desorption temperature by 60 °C were observed in comparison to its micrometric form. X-ray diffraction and hydrogen sorption measurements led to the proposal of two possible mechanisms for the hydrogen sorption based on an intimate contact between MgH2 and Nb2O5. %0 journal article %@ 0025-326X %A Jordi, A.,Ferrer, M.I.,Vizoso, G.,Orfila, A.,Basterretxea, G.,Alvarez, A.,Roig, D.,Garau, B.,Martinez, M.,Fernandez, V.,Fornes, A.,Ruiz, M.,Fornos, J.J.,Balaguer, P.,Duarte, C.M.,Rodriguez, I.,Alvarez, E.,Onken, R.,Orfila, P.,Tintore, J. %D 2006 %J Marine Pollution Bulletin %N 5-7 %P 361-368 %R doi:10.1016/j.marpolbul.2005.10.008 %T Scientific management of Mediterranean coastal zone: A hybrid ocean forecasting system for oil spill and search and rescue operations %U https://doi.org/10.1016/j.marpolbul.2005.10.008 5-7 %X The oil spill from Prestige tanker showed the importance of scientifically based protocols to minimize the impacts on the environment. In this work, we describe a new forecasting system to predict oil spill trajectories and their potential impacts on the coastal zone. The system is formed of three main interconnected modules that address different capabilities: (1) an operational circulation sub-system that includes nested models at different scales, data collection with near-real time assimilation, new tools for initialization or assimilation based on genetic algorithms and feature-oriented strategic sampling; (2) an oil spill coastal sub-system that allows simulation of the trajectories and fate of spilled oil together with evaluation of coastal zone vulnerability using environmental sensitivity indexes; (3) a risk management sub-system for decision support based on GIS technology. The system is applied to the Mediterranean Sea where surface currents are highly variable in space and time, and interactions between local, sub-basin and basin scale increase the non-linear interactions effects which need to be adequately resolved at each one of the intervening scales. Besides the Mediterranean Sea is a complex reduced scale ocean representing a real scientific and technological challenge for operational oceanography and particularly for oil spill response and search and rescue operations. %0 conference lecture %@ %A Martins, R.M.S.,Schell, N.,Beckers, M.,Muecklich, A.,Reuther, H.,Silva, R.J.C.,Mahesh, K.K.,Braz Fernandes, F.M. %D 2006 %J International Conference on Shape Memory and Superelastic Technologies, SMST-2006 %N %P %T In-situ study of the preferential orientation of magnetron sputtered Ni-Ti thin films as a function of bias and substrate type %U %X %0 journal article %@ 0094-8276 %A Frias, M.D.,Zorita, E.,Fernandez, J.,Rodruiguez-Puebla, C. %D 2006 %J Geophysical Research Letters %N %P L19807 %R doi:10.1029/2006GL027453 %T Testing statistical downscaling methods in simulated climates %U https://doi.org/10.1029/2006GL027453 %X The consistency of two statistical downscaling methods and two different predictors to estimate past (last millennium) and future (21st century) precipitation in the Iberian and Scandinavian Peninsulas is assessed in the surrogate climate of a coupled climate model simulation. The methods are based on canonical correlation analysis and the search for analogs, with sea level pressure (SLP) and 500 mb geopotential height as predictors. The precipitation downscaled by the statistical methods within the simulated climate is compared with the direct model output. The estimation based on SLP alone agrees with the modeled precipitation on the Iberian Peninsula. However, the estimates for Scandinavia in the 21st century are drier than the target precipitation. Geopotential height as predictor performs worse than SLP in both regions yielding too dry future climate. Differences in both regions are analyzed in terms of relative humidity, which contributes to future precipitation changes of Scandinavian precipitation. %0 journal article %@ 0025-5408 %A Aguey-Zinsou, K.-F.,Fernandez, J.R.A.,Klassen, T.,Bormann, R. %D 2006 %J Materials Research Bulletin %N 6 %P 1118-1126 %R doi:10.1016/j.materresbull.2005.11.011 %T Using MgO to improve the (de)hydriding properties of magnesium %U https://doi.org/10.1016/j.materresbull.2005.11.011 6 %X Of all the materials presently being investigated to safely store high volumes of hydrogen for mobile applications; magnesium remains the most attractive. Magnesium is a light, low cost metal with high capacity for hydrogen storage but its (de)hydriding kinetics have to be improved for practical applications. Recently, hydrogen kinetics in magnesium have been significantly improved by mechanically milling magnesium hydride with catalyst transition metals or metal oxides. Here, we report that similar improvements can be achieved without using a catalyst. Our results demonstrate that magnesium hydride milled with magnesium oxide exhibits dehydriding and hydriding kinetics as fast as those obtained with catalyst transition metals or metal oxides. %0 journal article %@ 1520-6106 %A Friedrichs, O.,Sanchez-Lopez, J.C.,Lopez-Cartes, C.,Klassen, T.,Bormann, R.,fernandez, A. %D 2006 %J The Journal of Physical Chemistry B %N 15 %P 7845-7850 %R doi:10.1021/jp0574495 %T Nb2O5 “Pathway Effect” on Hydrogen Sorption in Mg %U https://doi.org/10.1021/jp0574495 15 %X In the present work we investigate the hydrogen sorption mechanism in a MgH2/Nb2O5 composite and analyze why Nb2O5 could strongly improve hydrogen sorption kinetics in magnesium. Hereby we make use of the fact that Nb2O5 nanoparticles are able to reduce the milling time significantly with the achievement of excellent sorption kinetics, and can so exclude effects occurring at long-term milling that make difficult the study of the mechanism. On the basis of extensive chemical, crystalline, and microstructural characterization of the MgH2/Nb2O5 nanopowder system, a "pathway model" is proposed, which explains the kinetic hydrogen sorption improvement by a formation of pathways of niobium oxide species with lower oxidation state that facilitate the hydrogen transport into the sample. This mechanism is shown to be supported by additional oxidation experiments, which indicate increased oxygen diffusion through these pathways. %0 conference lecture %@ %A Pranzas, P.K.,Dornheim, M.,Leiner, V.,Aguey, F.,Ares Fernandez, J.R.,Gehrke, R.,Roth, S.,Goerigk, G.,Klassen, T.,Schreyer, A. %D 2005 %J International Conference on Neutron Scattering 2005 %N %P %T SANS/USANS investigations of nanocrystalline MgH2 for reversible hydrogen storage %U %X %0 conference poster %@ %A Pranzas, P.K.,Dornheim, M.,Ares Fernandez, J.R.,Aguey, F.,Leiner, V.,Klassen, T.,Goerigk, G.,Gehrke, R.,Schreyer, A. %D 2005 %J HASYLAB Users Meeting %N %P %T Characterisation of Nanostructured MgH2/MexOy for Reversible Storage of Hydrogen Using ASAXS/(U)SAXS %U %X %0 report part %@ %A Dornheim, M.,Pranzas, P.K.,Ares Fernandez, J.R.,Aguey-Zinsou, F.,Klassen, T.,Schreyer, A.,Gehrke, R. %D 2005 %J HASYLAB Annual Report 2004 - Part 1 %N %P 367-368 %T Structural characterisation of nanocrystalline MgH_2 for reversible storage of hydrogen using SAXS/USAXS %U %X %0 report part %@ %A Pranzas, P.K.,Dornheim, M.,Ares Fernandez, J.R.,Aguey-Zinsou, F.,Leiner, V.,Klassen, T.,Schreyer, A.,Goerigk, G. %D 2005 %J HASYLAB Annual Report 2004 - Part 1 %N %P 161-162 %T ASAXS study of the catalyst distribution in nanostructured MgH2/MexOy %U %X %0 conference lecture %@ %A Aguey-Zinsou, K.-F.,Nocolaisen, T.,Ares-Fernandez, J.R.,Klassen, T.,Bormann, R. %D 2005 %J 12th International Symposium on Metastable and Nano Materials, ISMANAM %N %P %T Effect of nanosized oxides on MgH2 (de)hydriding kinetics %U %X %0 conference lecture %@ %A Ares-Fernandez, J.R.,Aguey-Zinsou, K.-F.,Klassen, T.,Bormann, R. %D 2005 %J 12th International Symposium on Metastable and Nano Materials, ISMANAM %N %P %T Influence of impurities on the milling process of MgH2 %U %X %0 journal article %@ 1359-6462 %A Yavari, A.R.,LeMoulec, A.,de Castro, F.R.,Deledda, S.,Friedrichs, O.,Botta, W.J.,Vaughan, G.,Klassen, T.,Fernandez, A.,Kvick, A. %D 2005 %J Scripta Materialia %N 8 %P 719-724 %R doi:10.1016/j.scriptamat.2004.12.020 %T Improvement in H-sorption kinetics of MgH2 powders by using Fe nanoparticles generated by reactive FeF3 addition %U https://doi.org/10.1016/j.scriptamat.2004.12.020 8 %X We report the development of new nanostructured MgH2 composites in which fluorine and TM catalysts are introduced through the addition of TM fluorides such as FeF3. A fluorine transfer reaction then occurs to generate protective MgF2 plus Fe nanoparticles catalyst. The powders show sharply accelerated H-sorption kinetics at 300 C. H-sorption at rates acceptable for applications,can be obtained at temperatures much lower than those reported for MgH2 with other catalysts without significant loss of capacity. %0 conference poster %@ %A Nandigama, R.,Wartenberg, M.,Sauer, H. %D 2005 %J 84th Annual Meeting of the German Physiological Society %N %P %T Stimulation of prostate cancer cell proliferation by osmotic stress-induced ATP release %U %X %0 conference lecture %@ %A Friedrichs, O.,Sanchez-Lopez, J.C.,Lopez-Cartes, C.,Fernandez, A.,Dornheim, M.,Klassen, T.,Bormann, R. %D 2004 %J 7th International Conference on Nanostructured Materials %N %P %T XPS and TEM Study of the Oxygen Passivation Behaviour of Nanocrystalline Mg and MgH2 %U %X %0 journal article %@ 0936-577X %A Fernandez, J.,Saenz, J.,Zorita, E. %D 2003 %J Climate Research %N %P 195-215 %T Analysis of wintertime atmospheric moisture transport and its variability over southern Europe in the NCEP Reanalyses %U %X %0 journal article %@ 0148-0227 %A Herber, A.,Thomason, L.W.,Gernandt, H.,Leiterer, U.,Nagel, D.,Schulz, K.-H.,Kaptur, J.,Albrecht, T.,Notholt, J. %D 2002 %J Journal of Geophysical Research : Atmospheres %N D 10 %P AAC 6-13 %R doi:10.1029/2001JD000536 %T Continuous day and night aerosol optical depth observations in the Arctic between 1991 and 1999 %U https://doi.org/10.1029/2001JD000536 D 10 %X %0 GKSS report %@ %A Fernandez, J.,Saenz, J.,Zorita, E. %D 2001 %J %N %P %T Variability of the atmospheric moisture transports over the Mediterranean during winter %U %X %0 GKSS report %@ %A Zorita, E.,Saenz, J.,Fernandez, J.,Zubillaga, J. %D 2001 %J %N %P %T Modes of winter precipitation variability in the North Atlantic %U %X %0 journal article %@ 1361-8113 %A Fernandes Justo, L.,Magalhaes dos Santos, G. %D 2000 %J ICON %N %P %T The Otto Hahn Nuclear Ship and the German-Brazilian Deals on Nuclear Energy - a Case Study in Big Science %U %X %0 journal article %@ 0378-3839 %A Monbaliu, J.,Padilla-Hernandez, R.,Hargreaves, J.C.,Carretero Albiach, J.C.,Luo, W.,Sclavo, M.,Guenther, H. %D 2000 %J Coastal Engineering %N %P 41-62 %T The spectral wave model, WAM, adapted for applications with high spatial resolution %U %X %0 journal article %@ 0168-9002 %A Adams, D.,Adeva, B.,Akdogan, T.,Arik, E.,Arvidson, A.,Badelek, B.,Bardin, G.,Baum, G.,Berglund, P.,Betev, L.,Birsa, R.,Bjorkholm, P.,Bonner, B.E.,Botton, N.de,Boutemeur, M.,Bradamante, F.,Bravar, A.,Bressan, A.,Bultmann, S.,Burtin, E.,Cavata, C.,Clocchiatti, M.,Crabb, D.,Cranshaw, J.,Cuhadar, T.,Dalla, Torre, S.,Dantzig, R.van,Derro, B.,Deshpande, A.,Dhawan, S.,Dulya, C.,Dyring, A.,Eichblatt, S.,Faivre, J.C.,Fasching, D.,Feinstein, F.,Fernandez, C.,Forthmann, S.,Frois, B.,Gallas, A.,Garzon, J.A.,Gatignon, L.,Gaussiran, T.,Gilly, H.,Giorgi, M.,Goeler, E.v.,Goertz, S.,Golutvin, I.A.,Gracia, G.,Groot, N.de,Grosse Perdekamp, M.,Haft, K.,Harrach, D.v.,Hasegawa, T.,Hautle, P.,Hayashi, N.,Heusch, C.A.,Horikawa, N.,Hughes, V.W.,Igo, G.,Ishimoto, S.,Iwata, T.,Kabuss, E.M.,Kageya, T.,Karev, A.,Kessler, H.J.,Ketel, T.J.,Kiryluk, J.,Kiryushin, I.,Kishi, A.,Kisselev, Y.,Klostermann, L.,Kramer, D.,Krivokhijine, V.,Kroger, W.,Kukhtin, V.,Kurek, K.,Kyynarainen, J.,Lamanna, M.,Landgraf, U.,Le Goff, J.M.,Lehar, F.,Lesquen, A.de,Lichtenstadt, J.,Lindqvist, T.,Litmaath, M.,Lowe, M.,Magnon, A.,Mallot, G.K.,Marie, F.,Martin, A.,Martino, J.,Matsuda, T.,Mayes, B.,McCarthy, J.S.,Medved, K.,Meyer, W.,Middelkoop, G.van,Miller, D.,Miyachi, Y.,Mori, K.,Moromisato, J.,Nagaitsev, A.,Nassalski, J.,Naumann, L.,Niinikoski, T.O.,Oberski, J.E.J.,Ogawa, A.,Ozben, C.,Pereira, H.,Perrot-Kunne, F.,Peshekhonov, D.,Piegaia, R.,Pinsky, L.,Platchkov, S.,Plo, M.,Pose, D.,Postma, H.,Pretz, J.,Pussieux, T.,Radel, G.,Rijllart, A.,Reicherz, G.,Roberts, J.B.,Rock, S.,Rodriguez, M.,Rondio, E.,Ropelewski, L.,Sabo, I.,Saborido, J.,Sandacz, A.,Savin, I.,Schiavon, P.,Schiller, A.,Schuler, K.P.,Seitz, R.,Semertzidis, Y.,Sergeev, S.,Shanahan, P.,Sichtermann, E.P.,Simeoni, F.,Smirnov, G.I.,Staude, A.,Steinmetz, A.,Stiegler, U.,Stuhrmann, H.,Szleper, M.,Tessarotto, F.,Thers, D.,Tlaczala, W.,Tripet, A.,Unel, G.,Velasco, M.,Vogt, J.,Voss, R.,Whitten, C.,Windmolders, R.,Willumeit, R.,Wislicki, W.,Witzmann, A.,Ylostalo, J.,Zanetti, A.M.,Zaremba, K.,Zamiatin, N.I.,Zhao, J. %D 2000 %J Nuclear Instruments and Methods in Physics Research A %N 1 %P 1-19 %T Measurement of the SMC muon beam polarisation using the asymmetry in the elastic scattering off polarised electrons %U 1 %X %0 journal article %@ 0168-9002 %A Adams, D.,Adeva, B.,Arik, E.,Arvidson, A.,Badelek, B.,Ballintijn, M.K.,Bardin, G.,Baum, G.,Berglund, P.,Betev, L.,Bird, I.G.,Birsa, R.,Bjorkholm, P.,Bonner, B.E.,de Botton, N.,Boutemeur, M.,Bradamante, F.,Bravar, A.,Bressan, A.,Bultmann, S.,Burtin, E.,Cavata, C.,Crabb, D.,Cranshaw, J.,Cuhadar, T.,Dalla Torre, S.,Dantzig, R.van,Derro, B.,Deshpande, A.,Dhawan, S.,Dulya, C.,Dyring, A.,Eichblatt, S.,Faivre, J.C.,Fasching. 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11 %X %0 journal article %@ 0021-8898 %A Carsughi, F.,Bellmann, D.,Kulda, J.,Magnani, M.,Stefanon, M. %D 1997 %J Journal of Applied Crystallography %N %P 857-861 %T Absolute Calibration of Small-Angle Neutron Scattering Data of a Double-Crystal Diffractometer %U %X %0 conference lecture %@ %A Schreiner, P.,Krull, W.,Hanan, N. A.,Deen, J. R. %D 1997 %J 20th International Meeting on Reduced Enrichment for Research and Test Reactors (20th RERTR Meeting) %N %P %T Increasing the neutron flux after reduction of the core size of the FRG-1 %U %X %0 conference paper,conference lecture %@ %A Bourke, M.A.M.,Dunand, D.C.,Lawson, A.C.,Priesmeyer, H.G. %D 1997 %J 5th International Conference on Applications of Nuclear Techniques Neutrons in Research and Industry %N %P 131-135 %T Phase Transformations in Engineering Materials %U %X %0 conference paper,conference lecture %@ %A Ma, F.,Vivekanand, S.,Barmak, K.,Michaelsen, C. %D 1996 %J Proceedings Microscopy and Microanalysis 1996 %N %P 1020-1021 %T Transmission electron microscopy studies of solid state reactions in sputter-deposited Nb/Al multilayer thin films %U %X %0 conference paper,conference lecture %@ %A Barmak, K.,Vivekanand, S.,Ma, F.,Michaelsen, C. %D 1996 %J Metastable Phases and Microstructures, MRS 1995 Fall Meeting %N %P 257-262 %T Nucleation and growth of the first phase in sputter-deposited Nb/Al mutilayer thin films %U %X %0 conference lecture %@ %A Carsughi, F.,Bellmann, D.,Kulda, J.,Magnani, M.,Stefanon, M. %D 1996 %J SAS-96: X. International Conference on Small-Angle Scattering %N %P %T Absolute Calibration of Small-Angle Neutron Scattering Data of a Double-Crystal Diffractometer %U %X %0 conference paper,conference lecture %@ %A Heerens, J.,Anantharaman, S.,Hebenbrock, D.,Schwalbe, K.-H. %D 1993 %J 25. Vortragsveranstaltung DVM-Arbeitskreis Bruchvorgaenge; Themenschwerpunkt: Rissbildung und Rissausbreitung unter mehrachsiger mechanischer und thermischer Belastung %N %P 223-231 %T Einfluss von Neutronenbestrahlung auf das Sproedbruchverhalten des Druckbehaelterstahls 20MnMoNi55 %U %X %0 conference lecture %@ %A Heerens, J.,Anantharaman, S.,Schwalbe, K.-H. %D 1993 %J ASTM-Committee E-8 Meeting %N %P %T Prediction of neutron irradiation induced transition temperature shift using a simple stress based model %U %X %0 conference lecture %@ %A Heerens, J.,Anantharaman, S.,Hebenbrock, D.,Schwalbe, K.-H. %D 1992 %J European Structure Integrity Society: Meeting of ESIS TC 1 %N %P %T Evaluation of irradiation embrittlement by charpy impact and compact specimen tests %U %X %0 bachelor thesis %@ %A Ferdinand, M.C. %D %J %N %P %T Bestimmung und Vergleich von Elementverteilungen in Sedimentproben aus deutschen und belgischen Offshore-Windparks in der Nordsee %U %X Im 21. Jahrhundert spielen Windenergieanlagen eine zentrale Rolle bei der Umstellung Deutschlands auf erneuerbare Energien. Der Ausbau von Offshore-Windparks ist ein wesentlicher Bestandteil dieser Strategie. Trotz ihres positiven Beitrags zur nachhaltigen Energieerzeugung können Offshore-Windparks unbeabsichtigte negative Auswirkungen auf die Umwelt haben, darunter chemische Emissionen aus Korrosionsschutzsystemen. Ziel dieser Arbeit war es, die chemischen Emissionen von Offshore-Windparks in der deutschen und belgischen Nordsee zu untersuchen und zu vergleichen, wobei der Schwerpunkt auf den spezifischen Tracer Elementen lag. Von ausgewählten Offshore-Windparks in der deutschen und belgischen Nordsee wurden insgesamt 78 Sedimentproben entnommen. Die Korngröße wurde bestimmt, eine Nasssiebung zur Gewinnung der <20μm-Fraktion durchgeführt und es wurde für jede Probe der mikrowellenunterstützter Säuredruckaufschluss dreifach durchgeführt. Die Analyse der Elementverteilung erfolgte mittels ICP-MS/MS. Zur Auswertung der Daten wurden Verteilerkarte mit ArcGIS erstellt sowie Box-Whisker-Plots angefertigt. Der Fokus der Auswertung lag auf der Betrachtung der zeitlichen Entwicklung der chemischen Emissionen in der deutschen Nordsee und dem Vergleich von Unterschieden zwischen den beiden Regionen. Mit bereits vorhandenen Multielementdaten sowie den in dieser Arbeit erhobenen Daten ermöglichte die Untersuchung einer zeitlichen Entwicklung und das Erkennen möglicher Veränderungen. Insbesondere deutete sich in einigen Gebieten der deutschen Nordsee ein potenzieller Anstieg der Cadmiummassenfraktionen an. Unterschiede zwischen den beiden belgischen und deutschen Sedimentproben wurden ebenfalls identifiziert, wobei die Proben der belgischen Nordsee im Allgemeinen niedrigere Massenfraktionen aufwiesen. Eine eindeutige Aussage über die Freisetzung anorganischer Schadstoffe in die Meeresumwelt ist jedoch nur begrenzt möglich, da kein Unterschied für alle betrachteten Tracer Elemente zwischen Sedimenten aus den Windparks und ihrer Umgebung festgestellt wurde. Der festgestellte Anstieg der Cadmiumassenfraktionen könnte jedoch auf Emissionen aus galvanischen Anoden hindeuten, die als Korrosionsschutzsysteme verwendet werden. Es ist einer kontinuierlichen Überwachung der chemischen Emissionen von Offshore-Windparks nötig, um einen kritischen Anstieg rechtzeitig zu erkennen. Projekte wie OffChEm und ANEMOI sind von entscheidender Bedeutung, um zuverlässige Daten zu generieren, die für fundierte Entscheidungen über die künftige Planung und den Betrieb von Offshore-Windparks genutzt werden können.