TY - GEN A1 - Rogge, Stephan A1 - Hentschel, Christian A1 - Amtsfeld, Philipp A1 - Bestle, Dieter A1 - Meyer, Marcus A1 - Edwards, Paul T1 - Interactive Blade Modification in Para View Connected to Rapid GPU Flow Simulation N2 - 9th Automatic Design and Optimisation Seminar (ADOS 2011), 28.09.-29.09.2011, Derby KW - Simulation Y1 - 2011 N1 - Poster ER - TY - CHAP A1 - Meyer, Marcus A1 - Swoboda, Marius A1 - Rogge, Stephan A1 - Amtsfeld, Philipp A1 - Hentschel, Christian A1 - Bestle, Dieter T1 - Interactive Aerodynamic Design in a Virtual Environment T2 - HPCN-Workshop 2012, Braunschweig am 9./10. Mai 2012 Y1 - 2012 UR - http://www.t-systems-sfr.com/e/deu/download.php ER - TY - CHAP A1 - Rogge, Stephan A1 - Amtsfeld, Philipp A1 - Hentschel, Christian A1 - Bestle, Dieter A1 - Meyer, Marcus T1 - Using gestures to interactively modify turbine blades in a Virtual Environment T2 - Emerging Signal Processing Applications (ESPA), 2012 IEEE International Conference, Las Vegas, 12 - 14 Jan. 2012 KW - GPU-accelerated computational fluid dynamics KW - blade geometry;cumbersome input hardware KW - expensive input hardware KW - fluid flow KW - gesture-based interaction KW - interactively modify turbine blades KW - special interaction;virtual environments KW - blades;computational fluid dynamics KW - gesture recognition KW - graphics processing units KW - turbines Y1 - 2012 SN - 978-1-4673-0899-1 SP - 155 EP - 158 PB - IEEE ER - TY - CHAP A1 - Lockan, Michael A1 - Bestle, Dieter A1 - Janke, Christian A1 - Meyer, Marcus T1 - Optimization of Coupled System Components Using Approximations of Interface Quantities T2 - ASME Turbo Expo 2017, Turbomachinery Conference and Exposition, Volume 2C, Turbomachinery Charlotte, North Carolina, USA, June 26-30, 2017 KW - Optimization KW - Approximation Y1 - 2017 SN - 978-0-7918-5080-0 U6 - https://doi.org/10.1115/GT2017-64135 N1 - GT2017-64135 PB - ASME CY - New York, NY ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - B- and Strong Stationarity for Optimal Control of Static Plasticity with Hardening T2 - SIAM Journal on Optimization N2 - Optimal control problems for the variational inequality of static elastoplasticity with linear kinematic hardening are considered. The control-to-state map is shown to be weakly directionally differentiable, and local optimal controls are proved to verify an optimality system of B-stationary type. For a modified problem, local minimizers are shown to even satisfy an optimality system of strongly stationary type. KW - mathematical programs with complementarity constraints in function space KW - variational inequalities of first kind KW - elastoplasticity KW - Bouligand and strong stationarity Y1 - 2013 U6 - https://doi.org/10.1137/110821147 SN - 1052-6234 SN - 1095-7189 VL - 23 IS - 1 SP - 321 EP - 352 ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - C-Stationarity for Optimal Control of Static Plasticity with Linear Kinematic Hardening T2 - SIAM Journal on Optimization N2 - An optimal control problem is considered for the variational inequality representing the stress-based (dual) formulation of static elastoplasticity. The linear kinematic hardening model and the von Mises yield condition are used. Existence and uniqueness of the plastic multiplier is rigorously proved, which allows for the reformulation of the forward system using a complementarity condition. In order to derive necessary optimality conditions, a family of regularized optimal control problems is analyzed, wherein the static plasticity problems are replaced by their viscoplastic approximations. By passing to the limit in the optimality conditions for the regularized problems, necessary optimality conditions of C-stationarity type are obtained. KW - mathematical programs with complementarity constraints KW - static plasticity KW - optimal control KW - optimality conditions Y1 - 2012 U6 - https://doi.org/10.1137/100809325 SN - 0363-0129 SN - 1095-7138 VL - 50 IS - 5 SP - 3052 EP - 3082 ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - Integrability of displacement and stresses in linear and nonlinear elasticity with mixed boundary conditions T2 - Journal of Mathematical Analysis and Applications N2 - Equations of linear and nonlinear infinitesimal elasticity with mixed boundary conditionsare considered. The bounded domain is assumed to have a Lipschitz boundary and to satisfy additional regularity assumptions. W^(1,p) regularity for the displacements and L^p regularity for the stresses are proved for some p>2. KW - Nonlinear elasticity KW - Integrability KW - Mixed boundary conditions KW - Discontinuous coefficients Y1 - 2011 U6 - https://doi.org/10.1016/j.jmaa.2011.04.074 SN - 0022-247X VL - 382 IS - 2 SP - 802 EP - 813 ER - TY - GEN A1 - Mahmoodinezhad, Ali A1 - Morales, Carlos A1 - Naumann, Franziska A1 - Plate, Paul A1 - Meyer, Robert A1 - Janowitz, Christoph A1 - Henkel, Karsten A1 - Kot, Małgorzata A1 - Zöllner, Marvin Hartwig A1 - Wenger, Christian A1 - Flege, Jan Ingo T1 - Low-temperature atomic layer deposition of indium oxide thin films using trimethylindium and oxygen plasma T2 - Journal of Vacuum Science and Technology A N2 - Indium oxide (InxOy) thin films were deposited by plasma-enhanced atomic layer deposition (PEALD) using trimethylindium and oxygen plasma in a low-temperature range of 80–200 °C. The optical properties, chemical composition, crystallographic structure, and electrical characteristics of these layers were investigated by spectroscopic ellipsometry (SE), x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), as well as current-voltage and capacitance-voltage measurements. The SE results yielded a nearly constant growth rate of 0.56 Å per cycle and a thickness inhomogeneity of ≤1.2% across 4-in. substrates in the temperature range of 100–150 °C. The refractive index (at 632.8 nm) was found to be 2.07 for the films deposited at 150 °C. The PEALD-InxOy layers exhibit a direct (3.3 ± 0.2 eV) and an indirect (2.8 ± 0.1 eV) bandgap with an uptrend for both with increasing substrate temperature. Based on XPS characterization, all InxOy samples are free of carbon impurities and show a temperature-dependent off-stoichiometry indicating oxygen vacancies. XRD diffraction patterns demonstrate an onset of crystallization at 150 °C. Consistent with the optical, XPS, and XRD data, the films deposited at ≥150 °C possess higher electrical conductivity. Our findings prove that a low-temperature PEALD process of InxOy is feasible and promising for a high-quality thin-film deposition without chemical impurities on thermally fragile substrates. KW - Indium oxide KW - Plasma-enhanced atomic layer deposition KW - X-ray photoelectron spectroscopy KW - Ellipsometry KW - X-ray diffraction KW - Electrical properties Y1 - 2021 U6 - https://doi.org/10.1116/6.0001375 SN - 0734-2101 SN - 1520-8559 VL - 39 IS - 6 ER - TY - CHAP A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd ED - Leugering, Günter T1 - Optimal Control of Elastoplastic Processes: Analysis, Algorithms, Numerical Analysis and Applications T2 - Trends in PDE Constrained Optimization N2 - An optimal control problem is considered for the variational inequality representing the stress-based (dual) formulation of static elastoplasticity. The linear kinematic hardening model and the von Mises yield condition are used. The forward system is reformulated such that it involves the plastic multiplier and a complementarity condition. In order to derive necessary optimality conditions, a family of regularized optimal control problems is analyzed. C-stationarity type conditions are obtained by passing to the limit with the regularization. Numerical results are presented. KW - Mathematical programs with complementarity constraints in function space KW - Variational inequalities KW - Elastoplasticity KW - Regularization KW - Optimality conditions Y1 - 2014 SN - 978-3-319-05082-9 SN - 978-3-319-38114-5 SN - 978-3-319-05083-6 U6 - https://doi.org/10.1007/978-3-319-05083-6_4 SP - 27 EP - 41 PB - Birkhäuser CY - Cham ET - 1. Auflage ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - Existence and regularity of the plastic multiplier in static and quasistatic plasticity T2 - GAMM-Mitteilungen N2 - Existence of the plastic multiplier with L1 spatial regularity for quasistatic and static plasticity is proved for arbitrary continuous and convex yield functions and linear hardening laws. L2 regularity is shown in the particular cases of kinematic hardening, or combined kinematic and isotropic hardening KW - Plastic Multiplier KW - Static Plasticity KW - Quasistatic Plasticity KW - Variational Inequalities Y1 - 2011 U6 - https://doi.org/10.1002/gamm.201110006 SN - 1522-2608 VL - 34 IS - 1 SP - 39 EP - 44 ER -