TY - JOUR AU - Eke, Norbert ID - 23811 IS - 73 JF - German Life and Letters H. 1: Herta Müller and the Currents of European History TI - Der ‚Eigene Kalender‘ des Erinnerns: Die Wahrheit der erfundenen Erinnerung in Herta Müllers Romanen, Erzählungen und Essays ER - TY - CHAP AU - Eke, Norbert ED - Eke, Norbert ID - 23814 T2 - Vormärz-Hhandbuch. TI - Mark Hewitson: Militärwesen. Aus dem Englischen von Alena Diedrich und Norbert Otto Eke ER - TY - JOUR AU - Beloufa, Abbes AU - Bouguenna, Driss AU - Kermas, Nawel AU - As, Donat Josef ID - 23838 JF - Journal of Electronic Materials SN - 0361-5235 TI - A Physics-Based Compact Static and Dynamic Characteristics Model for Al2O3/InxAl1−xN/AlN/GaN MOS-HEMTs ER - TY - JOUR AU - Baron, Elias AU - Goldhahn, Rüdiger AU - Deppe, Michael AU - As, Donat Josef AU - Feneberg, Martin ID - 23840 JF - physica status solidi (b) SN - 0370-1972 TI - Photoluminescence Line‐Shape Analysis of Highly n‐Type Doped Zincblende GaN ER - TY - JOUR AU - Deppe, Michael AU - Henksmeier, Tobias AU - Gerlach, Jürgen W. AU - Reuter, Dirk AU - As, Donat Josef ID - 23841 JF - physica status solidi (b) SN - 0370-1972 TI - Molecular Beam Epitaxy Growth and Characterization of Germanium‐Doped Cubic Al x Ga 1− x N ER - TY - GEN ED - Eke, Norbert Otto ID - 23853 T2 - edition text + kritik TI - Herta Müller. Text + Kritik 155/2020. 2. Auflage: Neufassung. Hg. von Norbert Otto Eke und Christof Hamann. ER - TY - JOUR AU - Altepeter, Matthias AU - Schöppner, Volker ID - 23861 JF - Kunststoffe TI - Materialabbau im Doppelschneckenextruder ER - TY - CONF AB - Regarding the design of single screw extruders, the prediction of the throughput needs to be of high accuracy. The calculation of the solids conveying throughput is particularly important for extruders with a grooved feed section. In contrast to smooth barrel extruders the throughput of the entire plant is determined at the feed section. Various simplifications are necessary for an analytical modelling of the solids conveying, e.g. the classification into conveying cases, the assumption of solid block flow and the assumption of pressure anisotropy coefficients. In numerical simulations with the Discrete Element Method (DEM), which has recently been successfully used to describe solids conveying in smooth barrel extruders, the simplifications mentioned above are not taken into account. Here, the pellets are approximated as spherical particles or particles composed of spheres. Based on virtual overlaps, contact models and the solution of Newton's equations of motion, a more complex consideration of the pellet flow is possible. In each iteration step of the simulation, the particle velocities, contact forces and derived quantities, e.g. the mass throughput in the screw channel and the grooves or the radial pressure build-up along the grooved barrel can be evaluated. Therefore, a DEM simulation model can be investigated by means of statistical design of experiments in order to convert the target values into a metamodel by regression. Long computation times of numerical simulations will be avoided in this matter as well as too simple assumptions of analytical approaches. The influencing parameters to be simulated are divided into material, geometry and process parameters. Relevant material parameters are the coefficients of friction of the polymer-polymer and polymer-steel surface as well as the restitution coefficient and the particle diameter. The geometry is varied in the form of the screw diameter, the channel depth and pitch, the number of grooves and their width, depth and angle. By varying the angle, both conventional axial grooves and helical grooves are taken into account. Finally, the process parameters speed and backpressure are also considered in the simulations. In order to reduce the simulation effort, irrelevant parameters are identified in preliminary investigations. AU - Schöppner, Volker AU - Brüning, Florian ED - Hopmann, Christian ED - Dahlmann, Rainer ID - 23865 T2 - Advances in Polymer Processing 2020: Proceedings of the International Symposium on Plastics Technology TI - Development of a Solids Conveying Throughput Model for Grooved Barrel Extruders based on Discrete Element Simulations ER - TY - JOUR AU - Albrecht, Mirko AU - Bialaschik, Max AU - Gehde, Michael AU - Schöppner, Volker ID - 23868 JF - DVS CONGRESS 2020 - Große Schweißtechnische Tagung SN - 978-3-96144-098-6 TI - Einfluss der Materialschädigung auf die Schweißnahtqualität beim Warmgasstumpfschweißen von Polyamiden VL - 365 ER - TY - CONF AU - Albrecht, Mirko AU - Bialaschik, Max AU - Gehde, Michael AU - Schöppner, Volker ID - 23873 TI - Hot gas welding – Influences of the tool design ER -