@inproceedings{64562, abstract = {{Für das Verständnis und die Weiterentwicklung temperaturgestützter mechanischer Fü-geprozesse mit thermoplastischen Faser-Kunststoff-Verbunden (FKV) ist die zerstörungsfreie Analyse der Materialstruktur im Inneren des Fügepunktes während der Entstehung und Belastung erforderlich. Die Kombination aus Prüfung unter Temperatureinfluss und in situ Computertomographie (CT) eröffnet neue Möglichkeiten für die Fügeprozessanalyse. Dazu wurde dazu eine Thermokammer entwickelt und in eine bestehende in situ CT-Anlage integriert. Anwendungsszenarien sind die Herstellung und Prüfung von Fügepunkten unter Temperatur. Die Erwärmung erfolgt über einzeln regelbare Heizzonen, welche eine gezielte Temperaturführung über die gesamte Probengeometrie ermöglichen. Die Temperaturkurve eines Aufheizversuchs, sowie eine Röntgenprojektion einer Probe innerhalb der Thermokammer validie-ren die Konstruktion.}}, author = {{Dargel, Alrik and Köhler, Daniel and Gude, Maik and Kupfer, Robert}}, booktitle = {{Tagungsband 43. Vortrags- und Diskussionstagung Werkstoffprüfung 2025}}, editor = {{Zimmermann, Martina}}, isbn = {{978-3-88355-454-9}}, keywords = {{in situ CT, Thermokammer, Thermoplastische FKV}}, location = {{Dresden}}, pages = {{165--170}}, publisher = {{Deutsche Gesellschaft für Materialkunde e.V. (DGM)}}, title = {{{In situ CT unter Temperatur: Thermokammer für thermoplastische FKV-Fügeprozesse}}}, volume = {{43}}, year = {{2025}}, } @inproceedings{64293, author = {{Gerhardt, Nils Christopher and Hofmann, Martin R. and Zens, Leon and Möller, Jens and Besaga, Vira}}, booktitle = {{Practical Holography XXXIX: Displays, Materials, and Applications}}, title = {{{Quantitative holography for the characterisation of semiconductor amplifieres and lasers}}}, doi = {{10.1117/12.3041318}}, year = {{2025}}, } @article{64292, author = {{Lindemann, M. and D’Alessandro, M. and Ledentsov, N. and Makarov, O. Y. and Ledentsov, N. N. and Tibaldi, A. and Gerhardt, N. C. and Hofmann, M. R.}}, issn = {{1089-7550}}, journal = {{Journal of Applied Physics}}, number = {{5}}, publisher = {{AIP Publishing}}, title = {{{Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance width and frequency}}}, doi = {{10.1063/5.0275622}}, volume = {{138}}, year = {{2025}}, } @article{64662, abstract = {{ In this study, we investigate the impact of chromium-induced point defects on the nonlinear optical properties and electric-field-induced second harmonic generation (EFISH) in rutile titanium dioxide (TiO 2 ). Chromium thin films were deposited by electron beam evaporation on (001)-oriented bulk TiO 2 substrates and subsequently diffused into the lattice in a tube furnace under a nitrogen atmosphere at 900 °C. The introduction of chromium significantly enhanced the third harmonic generation (THG) of a 1560 nm laser, with an amplification factor of up to 8.3, indicative of an enhanced third-order nonlinear susceptibility, χ (3) . Moreover, the application of an external voltage induced a pronounced EFISH signal in the chromium-doped samples, further confirming the enhanced nonlinear response. These results demonstrate that defect engineering via chromium doping in rutile TiO 2 offers a promising pathway for the development of high-performance nonlinear optical devices. }}, author = {{Brinkmann, Marius and Meier, Falco and Spedt, Vladimir and Meier, Cedrik}}, issn = {{1094-4087}}, journal = {{Optics Express}}, number = {{26}}, publisher = {{Optica Publishing Group}}, title = {{{Boosting third-order nonlinearities in rutile TiO2 by chromium doping}}}, doi = {{10.1364/oe.572063}}, volume = {{33}}, year = {{2025}}, } @inproceedings{62041, author = {{Reckmann, Eileen and Temmen, Katrin}}, booktitle = {{EDULEARN Proceedings}}, editor = {{Gómez Chova, Luis and González Martínez, Chelo and Lees, Joanna}}, issn = {{2340-1117}}, publisher = {{IATED}}, title = {{{Intrinsic Motivation in Stem Outreach: An Analysis of External Factors in Voluntary and School-Based Lab Settings}}}, doi = {{10.21125/edulearn.2025.2462}}, volume = {{1}}, year = {{2025}}, } @inproceedings{64795, author = {{Ebert, Marc and Temmen, Katrin}}, location = {{Oldenburg}}, title = {{{Über Rätsel zur Quantenphysik – Eine spielerische Heranführung an ein abstraktes Thema}}}, year = {{2025}}, } @inproceedings{64798, abstract = {{Lead-containing piezoelectric ceramics are still the base for today’s ultrasonic transducers used in broad applications. This is partly due to missing powerful lead-free piezoelectric ceramic parts in the commercial market. There has been much research on lead-free materials but developing them into marketable parts seems to be an ongoing process. The actual exemption of ROHS has expired, but as the new exemption has already been requested, ceramic suppliers keep on selling lead containing products. Nevertheless, these should be replaced by lead-free alternatives for environmental and health issues. This contribution focuses on exploring the technological readiness level of lead-free hard piezoceramics for prestressed ultrasonic transducers. A small series of bolted Langevin transducers was set up with standard PZT material and three commercial lead-free variants. Results of the building process from individual ring ceramic characteristics to transducer load tests are presented. The main finding of this study is that the lead-free materials technically can compete with the standard PZT for medium-power applications. Some adaptations in the ultrasonic system must be done: the geometry must be altered to fit resonance frequency, and higher voltages or thinner ceramics are needed to achieve the same vibration level at low load. For reaching same power, the volume of lead-free ceramics must be 1.5 to 3 times larger. As already promoted in literature, mechanical losses at high vibration levels are smaller for the lead-free materials. This might help to argument lead-free piezoelectric materials in some applications. References 1. Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment. EUR-Lex Document 02011L0065-20240801. Available online: http://data.europa.eu/eli/dir/2011/65/2024-08-01 (accessed on 24 January 2025). 2. Langevin, P. (1918) Method and Apparatus for Transmitting and Receiving Submarine Elastic Waves Using the Piezoelectric Properties of Quartz. French Patent Office; Patent No. FR505703. 3. Hemsel, T.; Twiefel, J. (2023) Piezoelectric Ultrasonic Power Transducers. In Encyclopedia of Materials: Electronics; Academic Press: Oxford, UK; pp. 276–285. https://doi.org/10.1016/b978-0-12-819728-8.00047-4. 4. ATHENA Technologie Beratung GmbH (2025) Description of Ultrasound Generator. Available online: http://shop.myathena.de/epages/12074748.sf/de_DE/?ObjectPath=/Shops/12074748/Products/AM200 (accessed on 13 January 2025). 5. Littmann, W.; Hemsel, T.; Kauczor, C.; Wallaschek, J.; Sinha, W. (2003) Load-adaptive phase-controller for resonant driven piezoelectric devices. Proc. World Congr. Ultrason. 2003, 48, 547–550. 6. Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free Ceramics in Prestressed Ultrasonic Transducers. Actuators, 14(2), 55. https://doi.org/10.3390/act14020055 }}, author = {{Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}}, keywords = {{lead free piezoelectric ceramics, bolted Langevin transducer, medium power ultrasound.}}, location = {{Vilnius, Lithuania}}, title = {{{Bolted Langevin transducers with leadfree piezoelectric ceramics}}}, year = {{2025}}, } @inbook{62988, author = {{Amakor, Augustina C. and Berkemeier, Manuel B. and Wohlleben, Meike Claudia and Sextro, Walter and Peitz, Sebastian}}, booktitle = {{Lecture Notes in Computer Science}}, isbn = {{9783032045546}}, issn = {{0302-9743}}, publisher = {{Springer Nature Switzerland}}, title = {{{Surrogate-Assisted Multi-objective Design of Complex Multibody Systems}}}, doi = {{10.1007/978-3-032-04555-3_21}}, year = {{2025}}, } @article{64824, abstract = {{(1) Background: As digitalisation transforms society, digital competences are increasingly essential. Yet students’ digital competences often vary significantly, largely influenced by socio-economic background. Some schools—termed “resilient schools”—effectively counter these disadvantages and foster high digital competence. This study investigates the prevalence of such schools and examines how they differ from others. (2) Methods: Drawing on representative ICILS 2023 data, quantitative secondary analyses—including descriptive statistics, t-tests, and multiple regression—were conducted. Following the identification of resilient schools, in-depth analyses focus on those countries with substantial proportions of resilient schools above 10 percent (Austria, Italy, and Portugal), as these countries seem to have effective strategies to foster school resilience. (3) Results: The findings highlight considerable cross-national variation, indicating that school resilience is context-dependent. Resilient schools consistently emphasise student learning-related factors—such as ICT-related attitudes and educational aspirations—while the influence of home environments is less pronounced than in other schools. (4) Conclusions: Strengthening student learning-related factors appears to be crucial for building digital resilience. These insights can inform policy and practice aimed at fostering educational equity and closing the digital divide, particularly in socio-economically disadvantaged contexts.}}, author = {{Niemann, Jan and Eickelmann, Birgit and Drossel, Kerstin}}, issn = {{2227-7102}}, journal = {{Education Sciences}}, number = {{7}}, publisher = {{MDPI AG}}, title = {{{Overcoming Digital Inequalities—Identification and Characterisation of Digitally Resilient Schools in Different Countries Using ICILS 2023 Data}}}, doi = {{10.3390/educsci15070898}}, volume = {{15}}, year = {{2025}}, } @book{64147, abstract = {{Die Rolle der Grammatik im Deutschunterricht wird in der sprachdidaktischen Forschung intensiv diskutiert. Diese Einführung führt die Diskussion konstruktiv fort: Der Band bietet einen erweiterten, oft innovativen Blick auf grammatisches Lernen im Primar- und Sekundarbereich, er thematisiert neben den Grundlagen des Grammatikerwerbs auch Sprach(en)bewusstheit und Mehrsprachigkeit. Gemäß den aktuellen Bildungsstandards für das Fach Deutsch fokussiert er formale und funktionale Aspekte von Grammatik. Der Praxisteil liefert Methoden und Konzepte der Vermittlung als Best-Practice-Beispiele – nicht nur für Lehramtsstudierende, sondern auch für praktizierende Deutschlehrkräfte.}}, author = {{Becker, Tabea and Peschel, Corinna and Topalović, Elvira}}, isbn = {{9783476060099}}, keywords = {{Grammatik, Deutsch, Schule}}, publisher = {{J.B. Metzler}}, title = {{{Grammatik in der Schule. Eine Einführung}}}, doi = {{10.1007/978-3-476-06010-5}}, year = {{2025}}, } @inproceedings{57324, abstract = {{Generating SPARQL queries is crucial for extracting relevant information from diverse knowledge graphs. However, the structural and semantic differences among these graphs necessitate training or fine-tuning a tailored model for each one. In this paper, we propose UniQ-Gen, a unified query generation approach to generate SPARQL queries across various knowledge graphs. UniQ-Gen integrates entity recognition, disambiguation, and linking through a BERT-NER model and employs cross-encoder ranking to align questions with the Freebase ontology. We conducted several experiments on different benchmark datasets such as LC-QuAD 2.0, GrailQA, and QALD-10. The evaluation results demonstrate that our approach achieves performance equivalent to or better than models fine-tuned for individual knowledge graphs. This finding suggests that fine-tuning a unified model on a heterogeneous dataset of SPARQL queries across different knowledge graphs eliminates the need for separate models for each graph, thereby reducing resource requirements.}}, author = {{Vollmers, Daniel and Srivastava, Nikit and Zahera, Hamada Mohamed Abdelsamee and Moussallem, Diego and Ngonga Ngomo, Axel-Cyrille}}, booktitle = {{Knowledge Engineering and Knowledge Management}}, editor = {{Alam, Mehwish and Rospocher, Marco and van Erp, Marieke and Hollink, Laura and Gesese, Genet Asefa}}, isbn = {{978-3-031-77792-9}}, pages = {{174–189}}, publisher = {{Springer Nature Switzerland}}, title = {{{UniQ-Gen: Unified Query Generation Across Multiple Knowledge Graphs}}}, doi = {{https://doi.org/10.1007/978-3-031-77792-9_11}}, year = {{2025}}, } @book{54106, author = {{Heise, Tillmann}}, isbn = {{978-3-11-152346-0}}, pages = {{519}}, publisher = {{DeGruyter}}, title = {{{Das ‚andere‘ Europa der Schriftsteller. Ideen, Netzwerke und Schreibweisen des antiliberalen Europa-Diskurses in Deutschland und Österreich (1918–1934) }}}, doi = {{https://doi.org/10.1515/9783111525938}}, volume = {{166}}, year = {{2025}}, } @inproceedings{56298, abstract = {{In the general pattern formation (GPF) problem, a swarm of simple autonomous, disoriented robots must form a given pattern. The robots' simplicity imply a strong limitation: When the initial configuration is rotationally symmetric, only patterns with a similar symmetry can be formed [Yamashita, Suzyuki; TCS 2010]. The only known algorithm to form large patterns with limited visibility and without memory requires the robots to start in a near-gathering (a swarm of constant diameter) [Hahn et al.; SAND 2024]. However, not only do we not know any near-gathering algorithm guaranteed to preserve symmetry but most natural gathering strategies trivially increase symmetries [Castenow et al.; OPODIS 2022]. Thus, we study near-gathering without changing the swarm's rotational symmetry for disoriented, oblivious robots with limited visibility (the OBLOT-model, see [Flocchini et al.; 2019]). We introduce a technique based on the theory of dynamical systems to analyze how a given algorithm affects symmetry and provide sufficient conditions for symmetry preservation. Until now, it was unknown whether the considered OBLOT-model allows for any non-trivial algorithm that always preserves symmetry. Our first result shows that a variant of Go-to-the-Average always preserves symmetry but may sometimes lead to multiple, unconnected near-gathering clusters. Our second result is a symmetry-preserving near-gathering algorithm that works on swarms with a convex boundary (the outer boundary of the unit disc graph) and without holes (circles of diameter 1 inside the boundary without any robots).}}, author = {{Gerlach, Raphael and von der Gracht, Sören and Hahn, Christopher and Harbig, Jonas and Kling, Peter}}, booktitle = {{28th International Conference on Principles of Distributed Systems (OPODIS 2024)}}, editor = {{Bonomi, Silvia and Galletta, Letterio and Rivière, Etienne and Schiavoni, Valerio}}, isbn = {{978-3-95977-360-7}}, issn = {{1868-8969}}, keywords = {{Swarm Algorithm, Swarm Robots, Distributed Algorithm, Pattern Formation, Limited Visibility, Oblivious}}, location = {{Lucca, Italy}}, publisher = {{Schloss Dagstuhl -- Leibniz-Zentrum für Informatik}}, title = {{{Symmetry Preservation in Swarms of Oblivious Robots with Limited Visibility}}}, doi = {{10.4230/LIPIcs.OPODIS.2024.13}}, volume = {{324}}, year = {{2025}}, } @inbook{58135, author = {{Scharlau, Ingrid and Patrzek, Justine and Schreiber, Christine}}, booktitle = {{Psychologiedidaktik an allgemeinbildenden und beruflichen Schulen: Ein Lehrbuch mit Unterrichtsmaterialien}}, editor = {{Scharlau, Ingrid and Bender, Elena and Patrzek, Justine and Schreiber, Christine}}, pages = {{Begleitmaterial}}, publisher = {{Springer}}, title = {{{„Power-Posen“ – Fakten, frisierte Daten, Forschungslyrik? Eine Unterrichtsreihe zu Praktiken und Darstellungsformen psychologischer Forschung}}}, year = {{2025}}, } @inbook{58136, author = {{Scharlau, Ingrid and Schreiber, Christine}}, booktitle = {{Psychologiedidaktik an allgemeinbildenden und beruflichen Schulen: Ein Lehrbuch mit Unterrichtsmaterialien}}, editor = {{Scharlau, Ingrid and Bender, Elena and Patrzek, Justine and Schreiber, Christine}}, pages = {{Begleitmaterial}}, publisher = {{Springer}}, title = {{{Materialien zum Schreiben im Psychologieunterricht}}}, year = {{2025}}, } @book{58537, author = {{Paul, Jürgen and Schneider, Irene and Kokew, Stephan and Malik, Jamal and Schulze, Fritz and Günther, Sebastian and Schrode, Paula and Rebstock, Ulrich and Gharaibeh, Mohammad and Würsch, Renate and Rudolph, Ulrich and Reichmuth, Stefan and Haase, Claus-Peter and Metzler, Berenike}}, editor = {{Tamer, Georges and Antes, Peter and Hutter, Manfred and Rüpke, Jörg and Schmidt, Bettina}}, isbn = {{9783170340237}}, publisher = {{W. Kohlhammer GmbH}}, title = {{{Islam II}}}, doi = {{10.17433/978-3-17-034023-7}}, year = {{2025}}, } @inbook{58115, author = {{Elit, Stefan}}, booktitle = {{Was im Gedicht geschieht: Jan Wagner. Paderborn Wintersemester 2023/2024}}, editor = {{Elit, Stefan and Eke, Norbert Otto}}, isbn = {{978-3-8498-2062-6}}, pages = {{89--105}}, publisher = {{Aisthesis}}, title = {{{„Alles was gut ist“ – Jan Wagners lyrische Speisen (mit Getränken)}}}, volume = {{42}}, year = {{2025}}, } @inbook{58616, author = {{Weber, Tassja and Kober, Sabine and Lewa, Carmen and Scherer, Elisabeth and Schotemeier, Sarah}}, booktitle = {{Digitales Lehren und Lernen an der Hochschule. Strategien - Bedingungen - Umsetzung}}, editor = {{Mrohs, Lorenz and Franz, Julia and Herrmann, Dominik and Lindner, Konstantin and Staake, Thorsten}}, isbn = {{978-3-8376-7120-9}}, pages = {{47--54}}, publisher = {{transcript Verlag}}, title = {{{Eine Kultur des Teilens hochschulübergreifend durch OER voranbringen}}}, doi = {{https://doi.org/10.14361/9783839471203}}, year = {{2025}}, } @inbook{58797, author = {{Ellersiek, Annchristin and Kottmann, Brigitte and Möbius, Henning and Timmermanns, Franziska and Wapelhorst, Jule}}, booktitle = {{Atlas der Hochschullernwerkstätten. Ein (un-)vollständiges Kompendium.}}, editor = {{Stadler-Altmann, Ulrike and Hermann, Franziska and Kihm, Pacal and Schulte-Buskase, Alina}}, isbn = {{978-3-7815-2688-4}}, pages = {{474--486}}, publisher = {{Klinkhardt}}, title = {{{Die LIFT: Lernwerkstatt Inklusion und individuelle Förderung am Technologiepark der Universität Paderborn}}}, year = {{2025}}, } @inbook{58796, author = {{Kottmann, Brigitte and Stets, Mona}}, booktitle = {{Atlas der Hochschullernwerkstätten. Ein (Un-)vollständiges Kompendium.}}, editor = {{Stadler-Altmann, Ulrike and Hermann, Franziska and Kihm, Pascal and Schulte-Buskase, Alina}}, isbn = {{978-3-7815-2688-4}}, pages = {{161--176}}, publisher = {{Klinkhardt}}, title = {{{Die Lernwerkstatt an der Universität Bielefeld: Ein gemeinsamer Ort, ein Ort für gemeinsames Lernen}}}, year = {{2025}}, }