@article{47535, abstract = {{Consistent lightweight construction in the area of vehicle manufacturing requires the increased use of multi-material combinations. This, in turn, requires an adaptation of standard joining techniques. In multi-material combinations, the importance of integral cast components, in particular, is increasing and poses additional technical challenges for the industry. One approach to solve these challenges is adaptable joining elements manufactured by a thermomechanical forming process. By applying an incremental and thermomechanical joining process, it is possible to react immediately and adapt the joining process inline to reduce the number of different joining elements. In the investigation described in this publication, cast plates made of the cast aluminium alloy EN AC-AlSi9 serve as joining partners, which are processed by sand casting. The joining process of hypoeutectic AlSi alloys is challenging as their brittle character leads to cracks in the joint during conventional mechanical joining. To solve this, the frictional heat of the novel joining process applied can provide a finer microstructure in the hypoeutectic AlSi9 cast alloy. In detail, its Si is finer-grained, resulting in higher ductility of the joint. This study reveals the thermomechanical joining suitability of a hypoeutectic cast aluminium alloy in combination with adaptively manufactured auxiliary joining elements.}}, author = {{Borgert, Thomas and Neuser, Moritz and Hoyer, Kay-Peter and Homberg, Werner and Schaper, Mirko}}, issn = {{2504-4494}}, journal = {{Journal of Manufacturing and Materials Processing}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering, Mechanics of Materials}}, number = {{5}}, publisher = {{MDPI AG}}, title = {{{Thermomechanical Joining of Hypoeutectic Aluminium Cast Plates}}}, doi = {{10.3390/jmmp7050169}}, volume = {{7}}, year = {{2023}}, } @inproceedings{60647, abstract = {{Das umformtechnische Fügeverfahren Clinchen ermöglicht ein energiearmes Fügen von Blechen und dient traditionell der Übertragung mechanischer Kräfte. Neue Einsatzgebiete erfordern eine elektrische oder thermische Leitfähigkeit, sodass es notwendig ist, das Clinchen entsprechend zu qualifizieren. Es wurden Untersuchungen an Aluminiumverbindungen durchgeführt, welche mit hohen Kurzzeitströmen belastet wurden. Der Einfluss verschiedener Oberflächenvorbehandlungen wurde betrachtet. Als Charakterisierungsmethode für die Bauteile und die geclinchten Fügeverbindungen wird die Messung des elektrischen Widerstandes herangezogen. Die untersuchten Clinchverbindungen sind fähig, die im Fehlerfall auftretenden Kurzzeitströme zu übertragen. Der Oberflächenzustand übt dabei einen signifikanten Einfluss auf die Clinchpunktausbildung und damit auf deren elektrische Eigenschaften aus. Durch Messung des elektrischen Widerstandes vor und nach dem Fügen sowie nach einer Bestromung mit Fehlerströmen, kann das Kontaktverhalten qualifiziert werden.}}, author = {{Reschke, Gregor and Kalich, Jan and Füssel, Uwe}}, booktitle = {{Tagung Werkstoffprüfung 2022: Werkstoffe und Bauteile auf dem Prüfstand, Prüftechnik – Kennwertermittlung – Schadensvermeidung}}, editor = {{Zimmermann, Martina}}, isbn = {{978-3-88355-430-3}}, keywords = {{Clinchen, Bindemechanismen, elektrische Eigenschaften, Aluminium, Kurzzeitbestromung}}, location = {{Dresden}}, pages = {{374--379}}, title = {{{Methoden zur Charakterisierung der Bindemechanismen bei geclinchten elektrischen Kontakten}}}, year = {{2023}}, } @inproceedings{43090, abstract = {{The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation. }}, author = {{Bielak, Christian Roman and Böhnke, Max and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, publisher = {{Materials Research Forum LLC}}, title = {{{Numerical analysis of failure modeling in clinching process chain simulation}}}, doi = {{10.21741/9781644902417-33}}, year = {{2023}}, } @inproceedings{43031, abstract = {{Requirements of multi-material construction involve adjustments to standard joining techniques. Especially the growing importance of integral cast components poses additional engineering challenges for the industry. One approach to achieve these goals are adaptable joining elements formed by friction spinning. This approach uses friction-induced heat to form customisable joining elements to join sheets for different boundary conditions, even for brittle cast materials. It is possible to react immediately to adapt to the joining process inline and reduce the amount of different joining elements. As the joining partner serve casting plates of the aluminium casting alloy EN AC–AlSi9, which is processed in the sand casting. Joining hypoeutectic AlSi alloys constitutes a challenge because the brittle character of these cause cracks in the joint during conventional mechanical joining. Furthermore, the friction-induced heat of the novel joining process causes a finer microstructure in the hypoeutectic AlSi9 casting alloy. In particular, the eutectic Si is more fine-grained, resulting in higher joint ductility. This study indicates the joining suitability of a hypoeutectic aluminium casting alloy in combination with adaptive manufactured additional joining elements. Here, various mechanical and microstructural investigations validate the influence of the thermomechanical joining technique. In conclusion, the potential of this joining process is presented regarding the joinability of cast aluminium components.}}, author = {{Borgert, Thomas and Neuser, Moritz and Wiens, Eugen and Grydin, Olexandr and Homberg, Werner and Schaper, Mirko}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, location = {{Nürnberg}}, pages = {{187--194}}, publisher = {{Materials Research Forum LLC}}, title = {{{Influence of thermo-mechanical joining process on the microstructure of a hypoeutectic aluminium cast alloy}}}, doi = {{10.21741/9781644902417-24}}, volume = {{25}}, year = {{2023}}, } @article{52405, abstract = {{Multi-material designs (MMD) are more frequently used in the automotive industry. Hereby, the combination of different materials, metal sheets, or cast components, is mechanically joined, often by forming joining processes. The cast components mostly used are high-strength, age-hardenable aluminium alloys of the Al–Si system. Here, the low ductility of the AlSi alloys constitutes a challenge because their brittle nature causes cracks during the joining process. However, by using suitable solidification conditions, it is possible to achieve a microstructure with improved mechanical and joining properties. For this study, we used the twin-roll casting process (TRC) with water-cooled rollers to manufacture the hypoeutectic AlSi10Mg for the first time. Hereby, high solidification rates are realisable, which introduces a microstructure that is about four times finer than in the sand casting process. In particular, it is shown that a fine microstructure close to the modification with Na or Sr is achieved by the high solidification rate in the TRC process without using these elements. Based on this, the mechanical properties increase, and especially the ductility is enhanced. Subsequent joining investigations validate the positive influence of a high solidification rate since cracks in joints can be avoided. Finally, a microstructure-property-joint suitability correlation is presented.}}, author = {{Neuser, Moritz and Schaper, Mirko and Grydin, Olexandr}}, issn = {{2504-4494}}, journal = {{Journal of Manufacturing and Materials Processing}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering, Mechanics of Materials}}, number = {{4}}, publisher = {{MDPI AG}}, title = {{{Mechanical and Microstructure Characterisation of the Hypoeutectic Cast Aluminium Alloy AlSi10Mg Manufactured by the Twin-Roll Casting Process}}}, doi = {{10.3390/jmmp7040132}}, volume = {{7}}, year = {{2023}}, } @inproceedings{52406, author = {{Grydin, Olexandr and Neuser, Moritz and Schaper, Mirko}}, booktitle = {{ Conference: ICTP 2023: Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of PlasticityAt: Cannes (France)}}, isbn = {{9783031413407}}, issn = {{2195-4356}}, publisher = {{Springer Nature Switzerland}}, title = {{{Influence of Shell Material on the Microstructure and Mechanical Properties of Twin-Roll Cast Al-Si-Mg Alloy}}}, doi = {{10.1007/978-3-031-41341-4_61}}, year = {{2023}}, } @inbook{52454, author = {{Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}}, booktitle = {{Lecture Notes in Mechanical Engineering}}, isbn = {{9783031413407}}, issn = {{2195-4356}}, publisher = {{Springer Nature Switzerland}}, title = {{{Experimental and Numerical Investigation of Clinched Joints Under Shear Tensile Loading at High Strain Rates}}}, doi = {{10.1007/978-3-031-41341-4_12}}, year = {{2023}}, } @misc{59820, booktitle = {{ Zeitschrift für Romanische Sprachen und ihre Didaktik, Stuttgart: ibidem }}, editor = {{Bürgel, Christoph and Heiderich, Jens and Koch, Corinna and Schlaak, Claudia and Visser, Judith}}, number = {{1 + 2}}, title = {{{ Zeitschrift für Romanische Sprachen und ihre Didaktik, Stuttgart: ibidem }}}, volume = {{17}}, year = {{2023}}, } @misc{59488, title = {{{Rendez-vous à quelle heure ? Kommunikativer Transfer von Uhrzeiten in einen Verabredungsdialog}}}, year = {{2023}}, } @article{50271, author = {{Gharibian, Sevag and Le Gall, François}}, issn = {{0097-5397}}, journal = {{SIAM Journal on Computing}}, keywords = {{General Mathematics, General Computer Science}}, number = {{4}}, pages = {{1009--1038}}, publisher = {{Society for Industrial & Applied Mathematics (SIAM)}}, title = {{{Dequantizing the Quantum Singular Value Transformation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture}}}, doi = {{10.1137/22m1513721}}, volume = {{52}}, year = {{2023}}, } @inproceedings{51091, author = {{Drossel, Kerstin and Friesen, S. and Phillips, M. and Forkosh, A. and Christensen, R. and Trevisan, O. and Shaffer, D.W. and Horikoshi, I.}}, booktitle = {{Moving forward to new educational realities in the digital era. Report of EDUsummIT 2023 }}, editor = {{Phillips, M. and Fisser, P.}}, location = {{Kyoto, Japan}}, pages = {{59--70}}, title = {{{Thematic Working Group 8 - Pedagogical Reasoning and Reflective Practice: Teacher's Professional Learning and Development (TLPD) in New Digital Realities}}}, year = {{2023}}, } @inproceedings{47316, author = {{Nowakowski, Michał and Berndt, Axel and Plaksin, Anna Viktoria Katrin and Şahin, N. and Hadjakos, A.}}, booktitle = {{{Encoding Cultures—Joint MEC and TEI Conference 2023}}}, title = {{{Mixing Modalities: Graphical and Text-Based Interaction in Music Notation Editing}}}, year = {{2023}}, } @inbook{49663, author = {{Bürgel, Christoph and De Knop, Sabine}}, booktitle = {{Belgien – anregend anders: Fachwissenschaft und Fachdidaktik untersuchen die Vielfalt der Sprachen, Literaturen und Kulturen in Belgien}}, editor = {{Koch, Corinna and Schmitz, Sabine}}, pages = {{89--131}}, title = {{{La Belgique à travers les textes – Potenziale des sprachlichen und soziokulturellen Wissenserwerbs}}}, year = {{2023}}, } @inbook{47886, author = {{Schröer, Franz and Tenberge, Claudia }}, booktitle = {{Bloomsbury Handbook of Technology Education.}}, editor = {{Wooff, D. , McLain, M.}}, publisher = {{Bloomsbury Academic}}, title = {{{Inclusion and the Development of Technology Education - Thinking towards an inclusive curriculum for technology education in German primary schools}}}, year = {{2023}}, } @book{59830, editor = {{Vukadinovic, Vojin Sasa}}, publisher = {{Das vergessene Buch}}, title = {{{Maria Gleit: Abteilung Herrenmode. Roman eines Warenhausmädels. Herausgegeben und mit einem Nachwort von Vojin Saša Vukadinović. MIt einem Schlusswort von Vito Victor}}}, year = {{2023}}, } @article{61522, abstract = {{Linseisen, Elisa, 2020: High Definiton: Medienphilosophisches Image Processing, Lüneburg.}}, author = {{Althoff, Sebastian}}, issn = {{1869-3016}}, journal = {{ZPTh – Zeitschrift für Politische Theorie}}, number = {{1+2}}, pages = {{327--331}}, title = {{{Das ‚Zu Viel‘ digitaler Bilder}}}, doi = {{10.3224/zpth.v13i1-2.18}}, volume = {{13}}, year = {{2023}}, } @inproceedings{65900, author = {{Breuing, Friederike}}, location = {{Köln}}, title = {{{Von Facilitation und Prozessbegleitung - den bisher unterschätzten Kräften?! Einblicke in die Themeneingrenzungsphase}}}, year = {{2023}}, } @article{43032, abstract = {{Abstract The accessibility to rheological parameters for concrete is becoming more and more relevant. This is mainly related to the constantly emerging challenges, such as not only the development of high-strength concretes is progressing very fast but also the simulation of the flow behaviour is of high importance. The main problem, however, is that the rheological characterisation of fresh concrete is not possible via commercial rheometers. The so-called concrete rheometers provide valuable relative values for comparing different concretes, but they cannot measure absolute values. Therefore, we developed an adaptive coaxial concrete rheometer (ACCR) that allows the measurement of fresh concrete with particles up to d max = 5.5 mm {d}_{{\rm{\max }}}=5.5\hspace{.5em}{\rm{mm}} . The comparison of the ACCR with a commercial rheometer showed very good agreement for selected test materials (Newtonian fluid, shear thinning fluid, suspension, and yield stress fluid), so that self-compacting concrete was subsequently measured. Since these measurements showed a very high reproducibility, the rheological properties of the fresh concrete could be determined with high accuracy. The common flow models (Bingham (B), Herschel–Bulkley, modified Bingham (MB) models) were also tested for their applicability, with the Bingham and the modified Bingham model proving to be the best suitable ones.}}, author = {{Josch, Sebastian and Jesinghausen, Steffen and Schmid, Hans-Joachim}}, issn = {{1617-8106}}, journal = {{Applied Rheology}}, keywords = {{Condensed Matter Physics, General Materials Science}}, number = {{1}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Development of an adaptive coaxial concrete rheometer and rheological characterisation of fresh concrete}}}, doi = {{10.1515/arh-2022-0140}}, volume = {{33}}, year = {{2023}}, } @inbook{65888, author = {{Tusche, Carina and Herold-Blasius, Raja and Graewert, Laura and Gruhn, Katrin and Büdenbender, Anna and Sprütten, Frank and Tyrichter, Paul}}, booktitle = {{Digitaler Mathematikunterricht in Forschung und Praxis. Tagungsband zur Vernetzungstagung 2022 in Siegen}}, editor = {{Dilling, Frederik and Thurm, Daniel and Witzke, Ingo}}, pages = {{213–222}}, title = {{{Erfahrungsbasierte Entwicklungsschritte zur Gestaltung digitaler mathematischer Exit-Games}}}, year = {{2023}}, } @article{66111, author = {{Radermacher, Katharina and Schneider, Martin}}, issn = {{0032-3446}}, journal = {{Die Politische Meinung}}, number = {{580}}, title = {{{Employer Branding - Wie Arbeitgeber strategisch gegen den Arbeitskräftemangel vorgehen.}}}, volume = {{68}}, year = {{2023}}, }