TY - GEN A1 - Zhang, Wei A1 - Sun, Ke A1 - Li, Biyun A1 - Lee, Jae Young A1 - Xie, Ya-Hong A1 - Katzer, Jens A1 - Schroeder, Thomas A1 - Wei, Xinyu A1 - Russell, Thomas P. T1 - Field Emission Tip Array Fabrication Utilizing Geometrical Hindrance in the Oxidation of Si T2 - IEEE Transactions on Nanotechnology Y1 - 2012 U6 - https://doi.org/10.1109/TNANO.2012.2208472 SN - 1536-125X VL - 11 IS - 5 SP - 999 EP - 1003 ER - TY - GEN A1 - Wei, Yuqi A1 - Wei, Bin A1 - Ryo, Masahiro A1 - Bi, Yixian A1 - Sun, Xiangyun A1 - Zhang, Yingjun A1 - Liu, Nan T1 - Grazing facilitates litter-derived soil organic carbon formation in grasslands by fostering microbial involvement through microenvironment modification T2 - CATENA N2 - Grasslands store 10–30 % of the global soil organic carbon (SOC) and have the potential to mitigate the increase in atmospheric CO2 concentrations. Grazing plays a crucial role in regulating SOC storage in grassland ecosystems. However, the mechanistic understanding of how grazing influences the SOC dynamic still needs to be improved. We investigated how grazing-induced microenvironment changes influence the microbial assimilation of plant litter C and SOC formation from decomposed litter C in a multi-year field experiment, where grazing was simulated with mowing, dung and urine return, and trampling. We incubated 13C labeled litter in PVC collars to trace the microbial assimilation of litter C and the fate of litter C in the SOC after decomposition. While the grazing treatments changed soil properties marginally, mowing decreased above-ground plant biomass, litter mass, plant height, and plant cover (−12 % to −79 %). Accordingly, mowing treatment increased the exposure of litter to UV radiation (+38 %) and therefore facilitated the microbial assimilation of litter C (+20 %) and the SOC formation (+15 %). Trampling treatment promoted the transformation of litter C to SOC pools by mixing litter and soil (+34 %). Dung and urea return treatment did not affect SOC formation due to a marginal change in available nitrogen. Collectively, our results suggest that grazing facilitates litter-derived SOC formation by regulating microbial involvement through changes in the microenvironment. Our study indicates that grazing promotes SOC formation from plant litter, which maintains SOC storage in grasslands. Accurate quantification of the contribution of plant C input to SOC pools in different grasslands under various utilization is the next step to better predict SOC dynamics. KW - 13C-stable isotope KW - Grazing KW - Microenvironment KW - PLFA-SIP KW - Soil microbial assimilation KW - Soil organic carbon (SOC) formation Y1 - 2023 U6 - https://doi.org/10.1016/j.catena.2023.107389 SN - 0341-8162 VL - 232 PB - Elsevier BV ER - TY - GEN A1 - Liu, Wen-Cai A1 - Dong, Jie A1 - Zhang, Ping A1 - Zheng, Xing-Wei A1 - Ding, Wen-Jiang A1 - Li, De-Hui A1 - Korsunsky, Alexander M. T1 - Smooth and notched fatigue performance of aging treated and shot peened ZK60 magnesium alloy T2 - Journal of materials research Y1 - 2010 SN - 2044-5326 VL - 25 IS - 7 SP - 1375 EP - 1387 ER - TY - CHAP A1 - Dreibati, Ossama A1 - Zhang, Wei A1 - Wolf, Matthias A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Thermo-mechanical properties of refractory ceramic for the numerical simulation of their thermo-shock behaviour Y1 - 2011 ER - TY - GEN A1 - Wang, Pu A1 - Zhang, Wei A1 - Liang, Owen A1 - Pantoja, Marcos A1 - Katzer, Jens A1 - Schroeder, Thomas A1 - Xie, Ya-Hong T1 - Giant enhancement and anomalous behavior of Graphene Raman spectra on plasmonic nanostructures T2 - ACS Nano Y1 - 2012 SN - 1936-086X VL - 6 IS - 7 SP - 6244 EP - 6249 ER - TY - GEN A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Wolf, Matthias A1 - Dreibati, Ossama A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Investigation of the Thermal Shock Behavior of Ceramic Using a Combination of Experimental Testing and FE-Simulation Methods T2 - Advanced engineering materials N2 - Thermal shock behavior of ceramics plays a decisive role in their broad industrial applications. For enhanced understanding of damage and failure mechanism under thermal shock loading, in the present work, a combination of experimental testing and numerical simulation methods has been used. The thermal shock behavior of the alumina (99.7%) disk samples has been investigated by using a plasma test stand: the bottom of the ceramic disks were locally heated in the center by plasma beam; during the heat treatment the temperature distribution at the top of the sample was recorded with a thermographic system. To characterize the thermal shock resistance, a thermomechanical simulation was subsequently carried out. It calculates the temperature and stress distribution within the ceramic disks. The calculated critical thermal tension stresses are reported, which led to the failure of the ceramic disks under thermal shock loading. The effect of the sample thickness on the temperature and stress distribution is presented. Compared with the experimental results the simulated results show excellent agreement. As conclusion, it is possible to determine the thermal shock behavior of ceramic materials by the combination of experimental testing and numerical simulation. KW - Thermal Shock Behavior KW - Ceramic KW - FE-Simulation KW - Experimental Testing Y1 - 2013 UR - http://www.aem-journal.com U6 - https://doi.org/10.1002/adem.201200241 SN - 1527-2648 VL - 15 IS - 6 SP - 480 EP - 484 ER - TY - GEN A1 - Wang, P. A1 - Liang, O. A1 - Zhang, Wei A1 - Schroeder, Thomas A1 - Xie, Y. H. T1 - Ultra-Sensitive Graphene-Plasmonic Hybrid Platform for Label-Free Detection T2 - Advanced Materials Y1 - 2013 SN - 1521-4095 VL - 25 IS - 35 SP - 4918 EP - 4924 ER - TY - GEN A1 - Zhang, Wei A1 - Wang, Han A1 - Hartmann, Carsten A1 - Weber, Marcus A1 - Schütte, Christof T1 - Applications of the cross-entropy method to importance sampling and optimal control of diffusions T2 - SIAM (Society for Industrial and Applied Mathematics) Y1 - 2014 U6 - https://doi.org/10.1137/14096493X SN - 1095-7197 VL - 36 IS - 6 SP - A2654 EP - A2672 ER - TY - GEN A1 - Hartmann, Carsten A1 - Latorre, Juan C. A1 - Zhang, Wei A1 - Pavliotis, Grigorios A. T1 - Optimal control of multiscale systems using reduced-order models T2 - Journal of Computational Dynamics (JCD) Y1 - 2014 U6 - https://doi.org/10.3934/jcd.2014.1.279 SN - 2158-2505 VL - 1 IS - 2 SP - 279 EP - 306 ER - TY - GEN A1 - Zhang, Wei A1 - Melcher, Reinhold A1 - Travitzky, Nahum A1 - Greil, Peter T1 - Three-Dimensional Printing of Complex-Shaped Alumina/Glas Composites T2 - Advanced engineering materials Y1 - 2009 U6 - https://doi.org/10.1002/adem.200900213 SN - 1527-2648 VL - 11 IS - 12 SP - 1039 EP - 1043 ER - TY - CHAP A1 - Cypris, Jochen A1 - Weclas, Miroslaw A1 - Greil, Peter A1 - Schlier, Lorenz M. A1 - Travitzky, Nahum A1 - Zhang, Wei T1 - Application of macro-cellular SiC reactor to diesel engine-like injection and combustion conditions T2 - Porous Media and its Applications in Science, Engineering, and Industry: Fourth International Conference, Potsdam, Germany, 17-22 June 2012 KW - Three-dimensional printing, Macro-cellular SiSiC, complex shaped ceramic composites Y1 - 2012 SN - 978-0-7354-1053-4 U6 - https://doi.org/10.1063/1.4711197 SP - 341 EP - 346 PB - AIP, American Inst. of Physics CY - Melville, NY ER - TY - GEN A1 - Schlier, Lorenz M. A1 - Zhang, Wei A1 - Travitzky, Nahum A1 - Greil, Peter A1 - Cypris, Jochen A1 - Weclas, Miroslaw T1 - Macro-Cellular Silicon carbide Reactors for Nonstationary Combustion Under Piston Engine-Like Conditions T2 - International Journal of Applied Ceramic Technology KW - Three-dimensional printing KW - Macro-cellular SISIC KW - Complex shaped ceramic composites Y1 - 2011 U6 - https://doi.org/10.1111/j.1744-7402.2010.02591.x SN - 1744-7402 VL - 8 IS - 5 SP - 1237 EP - 1245 ER - TY - GEN A1 - Zhang, Wei A1 - Travitzky, Nahum A1 - Hu, Chunfeng A1 - Zhou, Yanchun A1 - Greil, Peter T1 - Reactive Hot Pressing and Properties of Nb2AlC T2 - Journal of the American Ceramic Society KW - MAX phases KW - Ceramic KW - Reactive Hot Pressing Y1 - 2009 U6 - https://doi.org/10.1111/j.1551-2916.2009.03187.x SN - 1551-2916 SN - 0002-7820 VL - 92 IS - 10 SP - 2396 EP - 2399 ER - TY - GEN A1 - Zhang, Wei A1 - Travitzky, Nahum A1 - Greil, Peter T1 - Formation of NbAl3/Al2O3 Composites by pressureless reactive Infiltration T2 - Journal of the American Ceramic Society KW - NbAl3/Al2O3 Composites KW - Pressing and three-dimensional printing KW - Reactive Infiltration Y1 - 2008 U6 - https://doi.org/10.1111/j.1551-2916.2008.02583.x SN - 1551-2916 SN - 0002-7820 VL - 91 IS - 9 SP - 3117 EP - 3120 ER - TY - GEN A1 - Melcher, Reinhold A1 - Zhang, Wei A1 - Travitzky, Nahum A1 - Greil, Peter T1 - 3D-Printing of Al2O3/Cu-O Composites T2 - Ceramic Forum international KW - Al2O3/Cu-O Composites KW - Pressureless Infiltration KW - 3D-Printing Y1 - 2006 SN - 0173-9913 VL - 83 IS - 13 SP - 18 EP - 22 ER - TY - GEN A1 - Jakobsen, Daniel A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Böhm, Anna A1 - Malzbender, Jürgen A1 - Michailov, Vesselin A1 - Roosen, Andreas T1 - Thermal shock behaviour of laminated multilayer refractories for steel casting applications reinforced by residual stresses T2 - Ceramics International Y1 - 2016 U6 - https://doi.org/10.1016/j.ceramint.2016.05.149 SN - 0272-8842 VL - 42 IS - 12 SP - 13562 EP - 13571 ER - TY - GEN A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Physical and FE-Simulation of Thermal Shock Behaviour of Refractory Ceramics T2 - refractories WORLDFORUM Y1 - 2016 SN - 1868-2405 VL - 8 IS - 2 SP - 110 EP - 117 ER - TY - CHAP A1 - Zhang, Wei A1 - Priefer, Marian A1 - Olenina, Mariia A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Additive manufacturing by laser beam build-up welding T2 - 6th International Conference on Additive Technologies - iCAT 2016, Nürnberg, Germany, 29. - 30. November 2016 Y1 - 2016 SN - 978-961-285-537-6 SP - 324 EP - 327 ER - TY - CHAP A1 - Zhang, Wei A1 - Schramm, Maximilian A1 - Kaneneks, Michael A1 - Michailov, Vesselin A1 - Fleischhauer, Matthias T1 - Laserstrahl-Auftragschweißen mit pulverförmigen keramischen und metallischen Zusatzwerkstoffen zur Herstellung von Gradientenwerkstoffen T2 - Große Schweißtechnische Tagung, Nürnberg, 15. - 17. September 2015 Y1 - 2015 SN - 978-3-945023-46-4 SP - 842 EP - 845 PB - DVS Media CY - Düsseldorf ER - TY - CHAP A1 - Zhang, Wei A1 - Doynov, Nikolay A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin A1 - Scheithauer, Uwe A1 - Michaelis, Alexander T1 - Investigation of thermal shock behaviour of refractory ceramics based on the calcium-aluminate T2 - 14th Biennial Worldwide Congress Unified International Technical Conference on Refractories (UNITECR) 2015, Vienna, Austria, September 15-18, 2015 Y1 - 2015 SN - 978-3-9815813-1-7 CY - Hannover ER - TY - GEN A1 - Atanga, Valetine Kubong A1 - Zhang, Wei A1 - Dreibati, Ossama A1 - Doynov, Nikolay A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin A1 - Scheffler, Michael T1 - Alumina-mullite Materials for Refractory Applications: Microstructure, Physical and Finite Element Simulation of Thermal Shock Behaviour T2 - refractories WORLDFORUM Y1 - 2012 SN - 1868-2405 VL - 4 IS - 1 SP - 159 EP - 164 ER - TY - GEN A1 - Hartmann, Carsten A1 - Schütte, Christof A1 - Weber, Marcus A1 - Zhang, Wei T1 - Importance sampling in path space for diffusion processes with slow-fast variables T2 - Probability Theory and Related Fields Y1 - 2018 U6 - https://doi.org/10.1007/s00440-017-0755-3 SN - 0178-8051 SN - 1432-2064 VL - 170 IS - 1-2 SP - 177 EP - 228 ER - TY - GEN A1 - Zhang, Wei A1 - Hartmann, Carsten A1 - Schütte, Christof T1 - Effective dynamics along given reaction coordinates, and reaction rate theory T2 - Faraday Discussions Y1 - 2016 U6 - https://doi.org/10.1039/C6FD00147E SN - 1359-6640 SN - 1364-5498 VL - 195 SP - 365 EP - 394 ER - TY - GEN A1 - Hartmann, Carsten A1 - Schütte, Christof A1 - Zhang, Wei T1 - Model reduction algorithms for optimal control and importance sampling of diffusions T2 - Nonlinearity Y1 - 2016 U6 - https://doi.org/10.1088/0951-7715/29/8/2298 SN - 1361-6544 SN - 0951-7715 VL - 29 IS - 8 SP - 2298 EP - 2326 ER - TY - CHAP A1 - Zhang, Wei A1 - Priefer, Marian A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Neue Möglichkeiten für die Additive Fertigung durch Laser-Pulver-Auftragschweißen T2 - DVS Congress 2017, Große Schweißtechnische Tagung, DVS Studentenkongress, Vorträge der Veranstaltungen in Düsseldorf vom 26. bis 29. September 2017 KW - Laser Additive Fertigung Y1 - 2017 SN - 978-3-96144-008-5 SP - 278 EP - 282 PB - DVS Media CY - Düsseldorf ER - TY - GEN A1 - Hartmann, Carsten A1 - Richter, Lorenz A1 - Schütte, Christof A1 - Zhang, Wei T1 - Variational characterization of free energy: theory and algorithms T2 - Entropy Y1 - 2017 U6 - https://doi.org/10.3390/e19110626 SN - 1099-4300 N1 - Special Issue "Understanding Molecular Dynamics via Stochastic Processes" VL - 19 IS - 11 ER - TY - GEN A1 - Wasilewski, Eric A1 - Wolf, Matthias A1 - Zhang, Wei A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Cu/LaCrO₃ joining by local melt infiltration through laser cladding T2 - Journal of the American Ceramic Society N2 - Direct bonding of copper and porous LaCrO₃ without an extra filler interlayer was successfully completed using local and fast Cu‐infiltration through laser cladding. This significantly reduced the susceptibility of the ceramic to cracking. A high‐speed camera investigation into the wetting and infiltration behavior of a Cu‐melt into LaCrO₃ with a porosity of ~63 vol% was performed. By adjusting the focal distance with a constant laser power of 300 W, the Cu‐melt was rapidly infiltrated into the ceramic preform in 10 seconds. This was completed under atmospheric air conditions, without added inert gas. The joining process developed can be used to fabricate ceramic/metal joints with targeted (micro‐) structure properties by adjusting the infiltrated melt and the infiltration depth, which would be suitable for many applications, such as multifunctional devices, solid oxide fuel cells or heating elements. Y1 - 2018 U6 - https://doi.org/10.1111/jace.15767 SN - 1551-2916 SN - 0002-7820 VL - 101 IS - 10 SP - 4472 EP - 4472 ER - TY - GEN A1 - Zhang, Wei A1 - Evdokimov, Anton A1 - Schleuß, Leander A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Laser beam build-up welding of AlSi12-powder on AlSi1MgMn-alloy substrate T2 - Progress in Additive Manufacturing N2 - In the present work, laser beam build-up welding of AlSi12 alloy powder on AlSi1MgMn-alloy (EN AW-6082) substrate has been studied to determine the laser deposition strategy for fabrication of 3-D structure. First, the influence of laser power, scanning speed and powder feeding rate on the output parameters, such as clad geometry, dilution ratio, powder efficiency and porosity were analysed for deposition of a single track. Mathematical relationships were then established and the optimal parameters were identified by the desirability approach. Second, these optimal process parameters are furthermore adjusted to fabricate rectangular, cylindrical and complex combination volumes; different layer deposition strategies are used and evaluated. Finally, by using an adapted deposition strategy, one prototype consisted of different complexly shaped elements on one curved Al-alloy substrate without welding fusion defects was manufactured. The average tensile strength of deposited samples with four different layer deposition directions (vertical 0°/90°; horizontal 0°/90°; horizontal 0° and horizontal 90°) was measured, respectively, which are comparable strengths or higher than those of cast samples. The microstructure of the laser-deposited material is investigated using optical microscopy and scanning electron microscopy as well as microcomputed tomography. Microstructure and hardness of deposited multilayers exhibit inhomogeneous distributions, which vary with the deposit location KW - Laser beam build-up welding KW - Laser metal deposition KW - AlSi12 KW - Additive manufacturing KW - Build-up strategy Y1 - 2019 UR - https://doi.org/10.1007/s40964-018-0065-z SN - 2363-9512 VL - 4 IS - 2 SP - 117 EP - 129 ER - TY - GEN A1 - Hartmann, Carsten A1 - Schütte, Christof A1 - Zhang, Wei T1 - Jarzysnki equality, fluctuation theorems and variance reduction: Mathematical analysis and numerical algorithms T2 - Journal of Statistical Physics Y1 - 2019 U6 - https://doi.org/10.1007/s10955-019-02286-4 SN - 1572-9613 SN - 0022-4715 VL - 175 IS - 6 SP - 1214 EP - 1261 ER - TY - GEN A1 - Zhang, Wei A1 - ElDidi, Hagar A1 - Gelaw, Fekadu A1 - Teka, Natnael A1 - Mekonnen, Dawit A1 - Yimam, Seid A1 - De Petris, Caterina A1 - Ringler, Claudia A1 - Meinzen-Dick, Ruth S. T1 - Getting ahead of the game: Experiential learning for groundwater governance in Ethiopia T2 - Sustain Valencia 2022 Y1 - 2022 SN - 978-84-942396-9-4 SP - 61 EP - 62 ER - TY - GEN A1 - ElDidi, Hagar A1 - Zhang, Wei A1 - Blackmore, Iyy A1 - Gelaw, Fekadu A1 - De Petris, Caterina A1 - Teka, Natnael A1 - Yimam, Seid A1 - Mekonnen, Dawit A1 - Ringler, Claudia A1 - Meinzen-Dick, Ruth S. T1 - Getting Ahead of the Game: Experiential Learning for Groundwater Governance in Ethiopia T2 - International Journal of the Commons Y1 - 2024 U6 - https://doi.org/10.5334/ijc.1316 SN - 1875-0281 VL - 18 IS - 1 SP - 66 EP - 81 ER - TY - GEN A1 - Lee, Roh Pin A1 - Huang, Qiuliang A1 - Yuchi, Wei A1 - Zhang, Tingting A1 - Bai, Jin A1 - Gräbner, Martin A1 - Meyer, Bernd T1 - Public knowledge, perception & support for alternative transformation routes towards sustainable waste management : a case analysis of Taiyuan in Shanxi Province, China T2 - 13th International Freiberg Conference on Circular Carbon Technologies KW - Sustainable waste management Y1 - 2025 SN - 2363-8702 ER -