@article{51192, abstract = {{ Destructive micrograph analysis (MA) is the standard method for the assessment of clinched joints. However, during the joint preparation for the MA, geometric features of the joint can change due to elastic effects and closing cracks. X-ray computed tomography (CT) is a promising alternative to investigate the joint non-estructively. However, if the material properties of similar joining partners are the same, the CT is not able to correctly resolve surfaces in the joint that are close to or pressing onto each other. These surfaces are relevant for the determination of characteristic dimensions such as neck thickness and undercut. By placing a thin, highly radiopaque tin layer between the joining partners, the interfacial area in the reconstructed volume can be highlighted. In this work, a method for the localisation of the tin layer inside the joint as well as threshold value procedures for the outer joint contour in cross section images are investigated. The measured characteristic dimensions are compared with measured values from MA of the same samples and of samples without tin layer. In addition, possible effects of the tin layer on the joining point characteristics as well as problems of the MA are discussed. }}, author = {{Busch, Matthias and Köhler, Daniel and Hausotte, Tino and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}}, issn = {{1435-4934}}, journal = {{e-Journal of Nondestructive Testing}}, number = {{12}}, publisher = {{NDT.net}}, title = {{{Approach to Determine the Characteristic Dimensions of Clinched Joints by Industrial X-ray Computed Tomography}}}, doi = {{10.58286/27519}}, volume = {{27}}, year = {{2022}}, } @inproceedings{51191, abstract = {{Zur Qualitätssicherung von Clinchpunkten werden häufig ex-situ Methoden, wie etwa Schliffbildanalysen, eingesetzt. Diese ermöglichen jedoch nicht die Berücksichtigung von Phänomenen, die während der Belastung auftreten, da sich nach der Entlastung elastische Deformationen zurückbilden und Risse wieder schließen. Dagegen kann mit der in-situ Computertomographie (CT) der innere Deformationszustand des Clinchpunkts, z.B. während eines Scherzugversuchs, untersucht werden. Hierbei ist es für artgleiche Werkstoffe aufgrund der hohen Pressungen im Clinchpunkt schwierig, die Trennfläche zwischen den Fügepartnern im CT-Scan zu erkennen. Daher wird eine radioopake Zwischenschicht aus Zinn in die Trennfläche eingebracht. In dieser Arbeit wird der Einfluss der Zwischenschicht auf die in-situ CT-Scherzugprüfung untersucht. Hierzu werden sowohl Kraft-Verlängerungs-Kurven als auch die Geometrie der Clinchpunkte während der Belastung verglichen.}}, author = {{Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}}, booktitle = {{Tagungsband zur Werkstoffprüfung 2022}}, editor = {{Zimmermann, Martina}}, location = {{Dresden}}, title = {{{Untersuchung zum Einfluss radioopaker Zwischenschichten bei der in-situ CT geclinchter Verbindungen}}}, year = {{2022}}, } @inbook{51195, author = {{Köhler, Daniel and Kupfer, Robert and Troschitz, Juliane and Gude, Maik}}, booktitle = {{The Minerals, Metals & Materials Series}}, isbn = {{9783031062117}}, issn = {{2367-1181}}, publisher = {{Springer International Publishing}}, title = {{{Clinching in In Situ CT—A Novel Validation Method for Mechanical Joining Processes}}}, doi = {{10.1007/978-3-031-06212-4_75}}, year = {{2022}}, } @article{51197, abstract = {{Clinching is a cost efficient method for joining components in series production. To assure the clinch point’s quality, the force displacement curve during clinching or the bottom thickness are monitored. The most significant geometrical characteristics of the clinch point, neck thickness and undercut, are usually tested destructively by microsectioning. However, micrograph preparation goes ahead with a resetting of elastic deformations and crack-closing after unloading. To generate a comprehensive knowledge of the clinch point’s inner geometry under load, in-situ computed tomography (CT) and acoustic testing (TDA) can be combined. While the TDA is highly sensitive to the inner state of the clinch point, it could detect critical events like crack development during loading. If such events are indicated, the loading process is stopped and a stepped in-situ CT of the following crack and deformation development is performed. In this paper, the concept is applied to the process of clinching itself, providing a detailed three-dimensional insight in the development of the joining zone. A test set-up is used which allows a stepwise clinching of two aluminium sheets EN AW 6014. Furthermore, this set-up is positioned within a CT system. In order to minimize X-ray absorption, a beryllium cylinder is used within the set-up frame and clinching tools are made from Si3N4. The actuator and sensor necessary for the TDA are integrated in the set-up. In regular process steps, the clinching process is interrupted in order to perform a TDA and a CT scan. In order to enhance the visibility of the interface, a thin tin layer is positioned between the sheets prior clinching. It is shown, that the test-set up allows a monitoring of the dynamic behaviour of the specimen during clinching while the CT scans visualize the inner geometry and material flow non-destructively.}}, author = {{Köhler, Daniel and Stephan, Richard and Kupfer, Robert and Troschitz, Juliane and Brosius, Alexander and Gude, Maik}}, issn = {{1662-9795}}, journal = {{Key Engineering Materials}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, pages = {{1489--1497}}, publisher = {{Trans Tech Publications, Ltd.}}, title = {{{Investigations on Combined <i>In Situ</i> CT and Acoustic Analysis during Clinching}}}, doi = {{10.4028/p-32330d}}, volume = {{926}}, year = {{2022}}, } @article{51193, author = {{Kupfer, Robert and Köhler, Daniel and Römisch, David and Wituschek, Simon and Ewenz, Lars and Kalich, Jan and Weiß, Deborah and Sadeghian, Behdad and Busch, Matthias and Krüger, Jan and Neuser, Moritz and Grydin, Olexandr and Böhnke, Max and Bielak, Christian-Roman and Troschitz, Juliane}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Engineering (miscellaneous), Chemical Engineering (miscellaneous)}}, publisher = {{Elsevier BV}}, title = {{{Clinching of Aluminum Materials – Methods for the Continuous Characterization of Process, Microstructure and Properties}}}, doi = {{10.1016/j.jajp.2022.100108}}, volume = {{5}}, year = {{2022}}, } @article{51196, author = {{Meschut, G. and Merklein, M. and Brosius, A. and Drummer, D. and Fratini, L. and Füssel, U. and Gude, M. and Homberg, W. and Martins, P.A.F. and Bobbert, M. and Lechner, M. and Kupfer, R. and Gröger, B. and Han, D. and Kalich, J. and Kappe, F. and Kleffel, T. and Köhler, D. and Kuball, C.-M. and Popp, J. and Römisch, D. and Troschitz, J. and Wischer, C. and Wituschek, S. and Wolf, M.}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Engineering (miscellaneous), Chemical Engineering (miscellaneous)}}, publisher = {{Elsevier BV}}, title = {{{Review on mechanical joining by plastic deformation}}}, doi = {{10.1016/j.jajp.2022.100113}}, volume = {{5}}, year = {{2022}}, } @inproceedings{36112, author = {{Pfeifer, Florian and Knorr, Lukas and Schlosser, Florian and Marten, Thorsten and Tröster, Thomas}}, location = {{Paphos, Zypern}}, title = {{{Ecological and Economical Feasibility of Inductive Heating for Sustainable Press Hardening Processes}}}, year = {{2022}}, } @misc{48695, author = {{Spener, Anna Maria}}, publisher = {{Deutsches Literaturarchiv Marbach}}, title = {{{Blogpost: "Flusseinsamkeiten: Hölderlins 'Ister' und 'Nekar' im Berlin der Gegenwart bei Tomer Dotan-Dreyfus"}}}, year = {{2022}}, } @inproceedings{45737, author = {{Alberternst, B. and Steinhoff, Lena and Eggert, A. and Giesler, M.}}, booktitle = {{2022 AMA Summer Academic Conference Proceedings, Chicago}}, location = {{Chicago}}, title = {{{Theorizing Marketplace Solidarity Systems: From Consumer–Firm Dyads to Structures of Mutual Support}}}, year = {{2022}}, } @inproceedings{45739, author = {{Garnefeld, I. and Steinhoff, Lena and Küpper, K.}}, booktitle = {{2022 AMA Winter Academic Conference Proceedings, Las Vegas}}, location = {{Las Vegas}}, title = {{{How Do I Tell Them? Analyzing Companies' Provision of Rejection Reasons in Product Testing Programs}}}, year = {{2022}}, } @inproceedings{54488, abstract = {{Vortrag 50 Jahre UPB}}, author = {{Mombeck, Mona Maria}}, title = {{{Pfotenglück - Hunde in der Pädagogik. Vortrag im Rahmen "50 Jahre UPB"}}}, year = {{2022}}, } @inproceedings{43496, abstract = {{We review recent results on the existence of ground states for the infrared-critical spin boson model, which describes the interaction of a massless bosonic field with a two-state quantum system. Explicitly, we derive a critical coupling $\lambda_{\mathsf c}>0$ such that the spin boson model exhibits a ground state for coupling constants $\lambda$ with $|\lambda|<\lambda_{\mathsf c}$. The proof combines a Feynman-Kac-Nelson formula for the spin boson model with external magnetic field, a 1D-Ising model correlation bound and a compactness argument in Fock space. Elaborating on the connection to a long-range 1D-Ising model, we briefly discuss the conjecture that the spin boson model does not have a ground state at large coupling. This note is based on joint work with David Hasler and Oliver Siebert.}}, author = {{Hinrichs, Benjamin}}, booktitle = {{Mathematical aspects of quantum fields and related topics}}, editor = {{Hiroshima, Fumio}}, location = {{RIMS, Kyoto}}, pages = {{60--73}}, title = {{{Existence of Ground States in the Infrared-Critial Spin Boson Model}}}, volume = {{2235}}, year = {{2022}}, } @article{43492, abstract = {{We consider the spin boson model with external magnetic field. We prove a path integral formula for the heat kernel, known as Feynman–Kac–Nelson (FKN) formula. We use this path integral representation to express the ground state energy as a stochastic integral. Based on this connection, we determine the expansion coefficients of the ground state energy with respect to the magnetic field strength and express them in terms of correlation functions of a continuous Ising model. From a recently proven correlation inequality, we can then deduce that the second order derivative is finite. As an application, we show existence of ground states in infrared-singular situations.}}, author = {{Hasler, David and Hinrichs, Benjamin and Siebert, Oliver}}, issn = {{1424-0637}}, journal = {{Annales Henri Poincaré}}, number = {{8}}, pages = {{2819--2853}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{FKN Formula and Ground State Energy for the Spin Boson Model with External Magnetic Field}}}, doi = {{10.1007/s00023-022-01160-6}}, volume = {{23}}, year = {{2022}}, } @phdthesis{43501, author = {{Hinrichs, Benjamin}}, title = {{{Existence of Ground States for Infrared-Critical Models of Quantum Field Theory}}}, doi = {{10.22032/dbt.51516}}, year = {{2022}}, } @inproceedings{34136, author = {{Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}}, keywords = {{tet_topic_scattering}}, location = {{Granada, Spain}}, publisher = {{Copernicus GmbH}}, title = {{{Light backscattering from numerical analog of planetary regoliths}}}, doi = {{10.5194/epsc2022-151}}, year = {{2022}}, } @misc{63667, author = {{Kullmer, G. and Weiss, D. and Krome, S. and A. Richard, H.}}, publisher = {{LibreCat University}}, title = {{{Entwicklung einer Einspannvorrichtung für Axialrissproben zur Ermittlung von bruchmechanischen Kennwerten für Rohre}}}, doi = {{10.48447/BR-2022-011}}, year = {{2022}}, } @inbook{33849, abstract = {{Modern traffic control systems are key to cope with current and future traffic challenges. In this paper information obtained from a microscopic traffic estimation using various data sources is used to feed a new developed traffic control approach. The presented method can control a traffic area with multiple traffic light systems (TLS) reacting to individual road users and pedestrians. In contrast to widespread green time extension techniques, this control selects the best phase sequence by analyzing the current traffic state reconstructed in SUMO and its predicted progress. To achieve this, the key aspect of the control strategy is to use Model Predictive Control (MPC). In order to maintain realism for real world applications, among other things, the traffic phase transitions are modelled in detail and integrated within the prediction. For the efficiency, the approach incorporates a fuzzy logic preselection of all phases reducing the computational effort. The evaluation itself is able to be easily adjusted to focus on various objectives like low occupancies, reducing waiting times and emissions, few number of phase transitions etc. determining the best switching times for the selected phases. Exemplary traffic simulations demonstrate the functionality of the MPC-based control and, in addition, some aspects under development like the real-world communication network are also discussed.}}, author = {{Malena, Kevin and Link, Christopher and Bußemas, Leon and Gausemeier, Sandra and Trächtler, Ansgar}}, booktitle = {{Communications in Computer and Information Science}}, editor = {{Klein, Cornel and Jarke, Mathias and Helfert, Markus and Berns, Karsten and Gusikhin, Oleg}}, isbn = {{9783031170973}}, issn = {{1865-0929}}, keywords = {{Traffic control, Traffic estimation, Real-time, MPC, Fuzzy, Isolated intersection, Networked intersection, Sensor fusion}}, pages = {{232–254}}, publisher = {{Springer International Publishing}}, title = {{{Traffic Estimation and MPC-Based Traffic Light System Control in Realistic Real-Time Traffic Environments}}}, doi = {{10.1007/978-3-031-17098-0_12}}, volume = {{1612}}, year = {{2022}}, } @article{63778, author = {{Tuisku, Outi and Johansson-Pajala, Rose-Marie and Hoppe, Julia Amelie and Pekkarinen, Satu and Hennala, Lea and Thommes, Kirsten and Gustafsson, Christine and Melkas, Helinä}}, issn = {{0144-929X}}, journal = {{Behaviour & Information Technology}}, number = {{6}}, pages = {{758--774}}, publisher = {{Informa UK Limited}}, title = {{{Assistant nurses and orientation to care robot use in three European countries}}}, doi = {{10.1080/0144929x.2022.2042736}}, volume = {{42}}, year = {{2022}}, } @inbook{63386, author = {{Elbwart, Katharina and Keatinge, Dagmar}}, booktitle = {{Wissenstransfer als Aufgabe, Herausforderung und Chance kulturwissenschaftlicher Forschung. }}, editor = {{Harmening, Anda-Lisa and Leinfeller, Stefanie and Meier, Rebecca}}, pages = {{201--229}}, publisher = {{wbg academic}}, title = {{{Teaching Language Internationally – Wissenstransfer in einem deutsch-kanadischen Lehrprojekt in der Lehrer*innenausbildung}}}, year = {{2022}}, } @inbook{63385, author = {{Elbwart, Katharina}}, booktitle = {{Language, Migration and Identity}}, editor = {{Ronan, Patricia and Ziegler, Evelyn}}, pages = {{23--49}}, publisher = {{Peter Lang}}, title = {{{A View from the Sunshine State: Mapping Perceptions and Language Ideologies in Florida. }}}, year = {{2022}}, }