@techreport{61278, abstract = {{This report outlines foundations of digital democracy and digital democracy research. It is structured into eight chapters: Chapter 1: Introduction Chapter 2: What is Digital Democracy? Chapter 3: Online Participation Chapter 4: Open Governance Chapter 5: Digital Activism Chapter 6: e-Voting Chapter 7: Global Trends that Influence Digital Democracy Chapter 8: Foreign Interferences in Democracy}}, author = {{Fuchs, Christian and Friesch, Kevin and Museba, Joel}}, pages = {{320}}, publisher = {{INNOVADE}}, title = {{{INNOVADE Interdisciplinary Knowledge Base on Digital Democracy - D2.1 }}}, doi = {{10.5281/zenodo.17079016}}, year = {{2025}}, } @inproceedings{62949, author = {{Fechner, Sabine and Cornelius, Soraya and Pollmeier, Pascal and Siepmann, Karin and Rubner, Isabel}}, booktitle = {{Digitale Transformation für Schule und Lehrkräfteausbildung gestalten}}, keywords = {{Digital, Digitalisierung, Künstliche Intelligenz, KI, Messsensoren, Fortbildung, Lehrkräfte, Chemie}}, location = {{Potsdam}}, title = {{{Digitalisierungsbezogene Kompetenzen im Chemieunterricht fördern – Ein Kurs für Lehrkräfte}}}, year = {{2025}}, } @inproceedings{62952, author = {{Pollmeier, Pascal and Ditter, David and Weiser, David and Siepmann, Karin and Ditter, Rebecca and Rubner, Isabel and Ponath, Jonas and Fechner, Sabine and Hoffmann, Adrian and Sommer, Katrin and Grandrath, Rebecca and Bohrmann-Linde, Claudia}}, booktitle = {{16th Conference of The European Science Education Research Association (ESERA)}}, keywords = {{Digital, Digitalisierung, Künstliche Intelligenz, KI, Messsensoren, Fortbildung, Lehrkräfte, Chemie}}, location = {{Copenhagen}}, title = {{{Fostering digitalisation-related competences of chemistry teachers}}}, year = {{2025}}, } @inproceedings{62921, author = {{Fox, Marvin Lee and Peeters, Hendrik and Fechner, Sabine}}, booktitle = {{Conference of The European Science Education Research Association (ESERA)}}, keywords = {{Artificial intelligence, education, chemistry}}, location = {{Copenhagen, Denmark}}, title = {{{How can students be supported by ChatGPT as a tutor in hands-on chemistry education?}}}, year = {{2025}}, } @inproceedings{62934, author = {{Peeters, Hendrik and Habig, Sebastian and Fechner, Sabine}}, booktitle = {{Jahrestagung der Gesellschaft für Didaktik der Chemie und Physik e.V. (GDCP)}}, location = {{Frankfurt am Main}}, title = {{{Prompting bei AR-gestütztem Experimentieren im Chemieunterricht}}}, year = {{2025}}, } @article{60466, author = {{Brockmeier, Julian and Schapeler, Timon and Lange, Nina Amelie and Höpker, Jan Philipp and Herrmann, Harald and Silberhorn, Christine and Bartley, Tim}}, journal = {{New Journal of Physics}}, title = {{{Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes}}}, doi = {{10.1088/1367-2630/ade46c}}, year = {{2025}}, } @article{60194, author = {{Peeters, Hendrik and Hansel, Jan-Luca and Graute, André and Fischer, Matthias and Weinberger, Christian and Neiske, Iris and Fechner, Sabine}}, journal = {{Laborpraxis}}, number = {{5-6}}, pages = {{22--25}}, title = {{{Virtual Reality trifft Künstliche Intelligenz. KI unterstützt bei virtueller Praktikumsvorbereitung}}}, year = {{2025}}, } @inbook{63098, author = {{Tan, Seng Chee and Phillips, Mike and Chammon, Jacob and Cochrane, Janet and Eickelmann, Birgit and Kral, Marijke and Medagedara, Peiris and Pangeni, Shesha Kanta and Murtagh, Karen and Kilcoyne, Anthony}}, booktitle = {{Designing Education Ecosystems for the Future: The Role of Digital Technologies. Report of EDUsummIT 2025 (eBook)}}, editor = {{Phillips, Michael and Fisser, Petra}}, location = {{Dublin}}, title = {{{Thematic Working Group 2 - Developing and leading digital learning cultures in schools: the role of leadership}}}, year = {{2025}}, } @inbook{63097, author = {{Prestridge, Sarah and Prasse, Doreen and Bescherer, Christine and Bruillard, Eric and Charania, Amina and Drossel, Kerstin and Friesen, Sharon and Ge, Xun and Jacobsen, Michele and Kafyulilo, Ayoub and Morren, Milou and Moynihan, Denis and Nikolova, Nikolina and Norris, Cathie and Redmond, Petrea and Siero, Niek and Slykhuis, David and Soloway, Elliot}}, booktitle = {{Designing Education Ecosystems for the Future: The Role of Digital Technologies. Report of EDUsummIT 2025 (eBook)}}, editor = {{Phillips, Michael and Fisser, Petra}}, title = {{{Thematic Working Group 4 - Professional digital competence of teachers: leveraging digital technologies to deepen learning}}}, year = {{2025}}, } @article{62110, author = {{Schönhärl, Korinna and Sureth-Sloane, Caren}}, journal = {{Ethik und Gesellschaft}}, pages = {{1--31}}, title = {{{Steuern und Steuergerechtigkeit – Ein Gespräch}}}, doi = {{10.18156/eug-2-2025-art-2.}}, volume = {{19 (2): Die andere Seite der sozialen Gerechtigkeit: Eine gerechtere Finanzierung steigender öffentlicher Ausgaben}}, year = {{2025}}, } @article{63108, abstract = {{In the context of decarbonization initiatives, the repairability and recyclability of components have become a major concern in various industrial sectors, particularly for resource-intensive components. The development of innovative bonding and debonding processes that must adhere to the stringent mechanical specifications of the manufacturers and facilitate their efficient disassembly is a major issue faced in the implementation of a sustainable circular economy. Although adhesively bonded joints satisfy the stringent requirements for mechanical performance, they present several challenges during the repair and recycling process. Solvolytically debondable epoxy resin adhesives may be employed to overcome this issue. In this study, we aim to conduct an exploratory feasibility study on the application of such chemical debonding mechanisms within an adhesive bond as well as to systematically analyse and evaluate the suitability of such adhesive systems for various applications. To this end, we employed various thermo-analytical methods and quasi-static tensile tests to characterise the mechanical adhesive and joint properties of two solvolytically debondable adhesive systems. Furthermore, we analysed the debondability of the adhesive joints and evaluated their feasibility in an industrial environment. The results indicate considerable application potential for solvolytically debondable adhesives, along with further development steps currently required.}}, author = {{Gilich, Julian and Kroos, Janika and Teutenberg, Dominik and Meschut, Gerson}}, issn = {{0021-8464}}, journal = {{The Journal of Adhesion}}, pages = {{1--26}}, publisher = {{Informa UK Limited}}, title = {{{Solvolytically debondable adhesive systems – potentials and challenges for repair and recycling}}}, doi = {{10.1080/00218464.2025.2600590}}, year = {{2025}}, } @article{60196, abstract = {{This paper examines the governance and quality control of digital curriculum resources (DCR) for K-12 mathematics education in Germany. It focuses on approval processes and criteria set by the 16 federal states, arguing that these have the potential to influence the development of DCR. Using qualitative content analysis, the study explores three research questions: which DCR require official approval, the criteria applied for approval, and the extent to which these criteria are mathematics-specific. Findings indicate that 10 federal states maintain official approval systems, covering digital equivalents of printed textbooks and selected supplemental materials. However, most DCR fall outside these regulated processes, leaving their evaluation largely to individual schools and teachers. The study identifies 17 categories of quality criteria, but reveals a lack of detailed, mathematics-specific requirements. Instead, many criteria are broad references to didactical principles and educational goals, leaving the interpretation and application of these quality standards open-ended. Subject-specific criteria are included but remain limited in specificity. The study underscores the need for research-informed, mathematics-specific quality standards to guide DCR development and approval, emphasizing their importance amidst challenges like artificial intelligence. Policymakers are urged to adopt clearer criteria to ensure high-quality DCR to be used in schools.}}, author = {{Rezat, Sebastian}}, issn = {{1863-9690}}, journal = {{ZDM – Mathematics Education}}, keywords = {{governance, digital curriculum resources, digital textbooks, digital curriculum materials, quality}}, pages = {{ 891–904}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{The quality of digital curriculum resources for mathematics in German educational policy}}}, doi = {{10.1007/s11858-025-01708-w}}, volume = {{57}}, year = {{2025}}, } @unpublished{63150, author = {{Cummings, Charley and Gratz, Sira and Kirkman, Ellen and Letz, Janina Carmen and Rock, J. Daisie and Špenko, Špela}}, pages = {{1--9}}, title = {{{An equivalence linking CM-types $A_\infty$ and $D_\infty$}}}, year = {{2025}}, } @unpublished{63149, author = {{Kekkou, Antonia and Letz, Janina Carmen and Stephan, Marc}}, pages = {{1--37}}, title = {{{Regular sequences for triangulated categories}}}, year = {{2025}}, } @unpublished{63148, author = {{Letz, Janina Carmen}}, pages = {{1--7}}, title = {{{The Rouquier dimension of the category of perfect complexes over a regular ring}}}, year = {{2025}}, } @article{59507, abstract = {{Differential equations posed on quadratic matrix Lie groups arise in the context of classical mechanics and quantum dynamical systems. Lie group numerical integrators preserve the constants of motions defining the Lie group. Thus, they respect important physical laws of the dynamical system, such as unitarity and energy conservation in the context of quantum dynamical systems, for instance. In this article we develop a high-order commutator free Lie group integrator for non-autonomous differential equations evolving on quadratic Lie groups. Instead of matrix exponentials, which are expensive to evaluate and need to be approximated by appropriate rational functions in order to preserve the Lie group structure, the proposed method is obtained as a composition of Cayley transforms which naturally respect the structure of quadratic Lie groups while being computationally efficient to evaluate. Unlike Cayley-Magnus methods the method is also free from nested matrix commutators.}}, author = {{Wembe Moafo, Boris Edgar and Offen, Cristian and Maslovskaya, Sofya and Ober-Blöbaum, Sina and Singh, Pranav}}, journal = {{J. Comput. Appl. Math}}, number = {{15}}, title = {{{Commutator-free Cayley methods}}}, doi = {{10.1016/j.cam.2025.117184}}, volume = {{477}}, year = {{2025}}, } @inproceedings{63157, abstract = {{Three-phase cascaded H-bridge converters (CHBs) in star configuration require reliable current controllers to evenly charge the module DC-link capacitors. Conventionally, a current control in dq-coordinates is utilized. At steady state, the resulting calculated reference arm voltages are sinusoidal, have identical amplitudes and show a phase shift of 120 degree to each other. For balanced grid inductors, the resulting grid currents also have the same amplitude. However, own simulations show that unbalanced grid inductors always lead to different grid current amplitudes (4% difference in this case). As a result, the averaged charging module powers differ and the peak DC-link capacitor voltage rises as well. In the first step, an adaptation of an existing zero-sequence voltage injection is proposed. For balanced grid inductors, it converges to the 3rd harmonic voltage injection which can reduce the peak-to-peak DC-link voltage ripple up by to 50% and balances the power between the phases. However, unbalanced grid inductors still lead to the same unbalanced grid currents of 4%. Therefore, a new method with 4 integrators based on linear regression is proposed to achieve sinusoidal grid currents for unbalanced inductors. The proposed method has a similar transient dynamic as the conventional dq control, but balances the grid currents nearly ideally. Simulation results of a 1MW cascaded H bridge and a scaled-down prototype verify the proposed method.}}, author = {{Unruh, Roland and Böcker, Joachim and Schafmeister, Frank}}, booktitle = {{2025 Energy Conversion Congress & Expo Europe (ECCE Europe)}}, keywords = {{Cascaded H-Bridge, Current Control, dq Transformation, Linear Regression, Unbalanced Inductors}}, location = {{Birmingham, United Kingdom}}, publisher = {{IEEE}}, title = {{{Three-Phase Instantaneous Current Controller for Unbalanced Grid Inductors Without DQ Transform for Cascaded H-Bridge Converters}}}, doi = {{10.1109/ecce-europe62795.2025.11238538}}, year = {{2025}}, } @article{63160, author = {{Rose, Hendrik and Schumacher, Stefan and Meier, Torsten}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{24}}, publisher = {{American Physical Society (APS)}}, title = {{{Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons}}}, doi = {{10.1103/528f-7smh}}, volume = {{112}}, year = {{2025}}, } @inbook{61239, abstract = {{In diesem Beitrag wird ein Überblick gegeben, welche Forschung zu Digitalisierung und künstliche Intelligenz (KI) in den Bereichen Verwaltung, Forschung, Studium und Lehre sowie Governance von Hochschulen besteht. Der Fokus liegt hierbei auf aktuellen Forschungsergebnissen seit der Coronapandemie. Zentral sind Fragen nach Effektivität und Effizienz durch Digitalisierung und KI und danach, wie Verbesserungen angestoßen werden können.}}, author = {{Steinhardt, Isabel}}, booktitle = {{Hochschulforschung}}, editor = {{Pasternach, Peer and Reinmann, Gabi and Schneijderberg, Christian}}, isbn = {{9783748943334}}, keywords = {{Digitalisierung, Künstliche Intelligenz, Forschung, Lehre, Governance, Verwaltung}}, pages = {{197--206}}, publisher = {{Nomos}}, title = {{{Digitalisierung und Künstliche Intelligenz}}}, doi = {{10.5771/9783748943334-197}}, year = {{2025}}, } @inbook{61237, abstract = {{In diesem Beitrag wird zunächst die historische Entstehung von Open Science kurz skizziert und definiert, was unter diesem Begriff zu verstehen ist. Daran anschließend werden die Open-Science-Praktiken Open Data, Open Access, Open Source, Open Methodology und Open Peer Review dargestellt und diskutiert, welche Forschungserkenntnisse zu Open Science vorhanden sind. Im Schluss werden Forschungsdesiderate aufgegriffen und die Implikationen von Open Science für die Wissenschaft erläutert.}}, author = {{Steinhardt, Isabel and Röwert, Ronny}}, booktitle = {{Hochschulforschung}}, editor = {{Pasternack, Peer and Reinmann, Gabi and Schneijderberg, Christian }}, isbn = {{9783748943334}}, keywords = {{Open Data, Open Access, Open Source, Open Methodology, Open Peer Review}}, pages = {{487--496}}, publisher = {{Nomos}}, title = {{{Open Science}}}, doi = {{10.5771/9783748943334-487}}, year = {{2025}}, }