@article{63798, author = {{Vernholz, Mats and Temmen, Katrin}}, issn = {{2199-8825}}, journal = {{die hochschullehre}}, number = {{8}}, pages = {{97--111}}, publisher = {{wbv Publikation}}, title = {{{Motive Ingenieurstudierender für den Besuch (fach-)didaktischer Lehrveranstaltungen im Projekt EduTech Net OWL}}}, doi = {{10.3278/HSL2608W}}, volume = {{12}}, year = {{2026}}, } @article{63800, abstract = {{In this contribution, we address the estimation of the frequency-dependent elastic parameters of polymers in the ultrasound range, which is formulated as an inverse problem. This inverse problem is implemented as a nonlinear regression-type optimization problem, in which the simulation signals are fitted to the measurement signals. These signals consist of displacement responses in waveguides, focusing on hollow cylindrical geometries to enhance the simulation efficiency. To accelerate the optimization and reduce the number of model evaluations and wait times, we propose two novel methods. First, we introduce an adaptation of the Levenberg–Marquardt method derived from a geometrical interpretation of the least-squares optimization problem. Second, we introduce an improved objective function based on the autocorrelated envelopes of the measurement and simulation signals. Given that this study primarily relies on simulation data to quantify optimization convergence, we aggregate the expected ranges of realistic material parameters and derive their distributions to ensure the reproducibility of optimizations with proper measurements. We demonstrate the effectiveness of our objective function modification and step adaptation for various materials with isotropic material symmetry by comparing them with the Broyden–Fletcher–Goldfarb–Shanno method. In all cases, our method reduces the total number of model evaluations, thereby shortening the time to identify the material parameters.}}, author = {{Itner, Dominik and Dreiling, Dmitrij and Gravenkamp, Hauke and Henning, Bernd and Birk, Carolin}}, issn = {{0888-3270}}, journal = {{Mechanical Systems and Signal Processing}}, keywords = {{Material parameter estimation, Waveguide, Nonlinear optimization, Inverse problem, Least squares}}, pages = {{113904}}, title = {{{A modified Levenberg–Marquardt method for estimating the elastic material parameters of polymer waveguides using residuals between autocorrelated frequency responses}}}, doi = {{https://doi.org/10.1016/j.ymssp.2026.113904}}, volume = {{247}}, year = {{2026}}, } @article{63827, abstract = {{Light-emitting diodes (LEDs) are becoming increasingly important across various sectors of the lighting industry and are being used more frequently. In the field of symbolic projection, research is increasingly focusing on implementing light modulation using energy-efficient, incoherent LEDs rather than lasers. Since light modulation in micro- and nano-optics is typically achieved through phase modulation, Finite-Difference Time-Domain (FDTD) simulations are employed for analysis. The objective of this article is to investigate different approaches for approximating incoherent monochromatic light sources within FDTD simulations. To this end, two approaches based on dipole sources are considered, as well as a method involving plane waves with modulated wavefronts based on Cosine–Fourier functions and a method based on the superposition of Gaussian beams. These methods are evaluated in terms of their accuracy using a two-dimensional double-slit configuration and are compared against a fully incoherent analytical reference.}}, author = {{Metzner, Dominik and Potthoff, Jens and Zentgraf, Thomas and Förstner, Jens}}, issn = {{2304-6732}}, journal = {{Photonics}}, keywords = {{tet_topic_opticalantenna, tet_topic_numerics, tet_topic_meta}}, number = {{2}}, publisher = {{MDPI AG}}, title = {{{Approximating Incoherent Monochromatic Light Sources in FDTD Simulations}}}, doi = {{10.3390/photonics13020128}}, volume = {{13}}, year = {{2026}}, } @article{63838, abstract = {{Industrial electrification is increasing to reduce fossil fuel dependence, alongside a growing share of volatile renewables. A secure and reliable energy supply is crucial for industry, leading to a shift from centralised to decentralised grid structures. DC microgrids becoming increasingly popular in industry, since they enable energy recuperation from braking, reduce components and cables, and integrate storage and local generation to manage supply interruptions or peak loads. EVs add further synergies by serving as mobile storage units, helping to store and redistribute locally generated renewable energy. This paper analyses how EV integration in droop-controlled DC grids can contribute to a more stable, low-emission and peak-reduced load profile to the supply grid through load shifting and bridge interruptions. A droop-controlled DC grid model has been developed, incorporating an EV charging park based on probability functions. Scalable scenarios allow for diverse condition analysis using an energy management system that utilises fuzzy logic and sequential MILP optimisation. It has been shown that a 7% improvement of coefficient represented grid-serving behaviour is possible by load shifting. It has also been demonstrated that an optimised EMS can reduce the demand-based CO2 emissions by 41kg for a representative day compared to a fuzzy logic EMS. At the same time peak load is decreased yielding a more constant residual load. These results highlight the potential of a controlled bidirectional charging infrastructure in DC grids and underscore the need to explicitly consider charging processes to ensure a residual load as constant as possible.}}, author = {{Rahlf, Henning Christoph and Knorr, Lukas and Althoff, Simon and Meschede, Henning}}, issn = {{2666-9552}}, journal = {{Smart Energy}}, keywords = {{DC-grid, Droop control, Grid-serving behaviour, Grid stability, Bidirectional charging, Sequential decision, MILP optimisation}}, publisher = {{Elsevier BV}}, title = {{{Analysis of bidirectional EV charging infrastructures within industrial DC grids}}}, doi = {{10.1016/j.segy.2026.100227}}, year = {{2026}}, } @proceedings{63860, editor = {{Hogan, Aidan and Satoh, Ken and Dag, Hasan and Turhan, Anni-Yasmin and Roman, Dumitru and Soylu, Ahmet}}, isbn = {{978-3-032-08886-4}}, publisher = {{Springer}}, title = {{{Rules and Reasoning - 9th International Joint Conference, RuleML+RR 2025, Istanbul, Turkey, September 22-24, 2025, Proceedings}}}, doi = {{10.1007/978-3-032-08887-1}}, volume = {{16144}}, year = {{2026}}, } @article{63883, abstract = {{Proton exchange membranes (PEMs) are essential for fuel cells, yet conventional materials like Nafion suffer from humidity dependence and limited thermal stability. This study introduces sulfonated phenylene-bridged periodic mesoporous organosilicas (PMOs) as promising inorganic–organic hybrid PEMs, synthesized via surfactant-templating with varying alkyl chain lengths for different mesopore sizes. Post-synthetic functionalization involves nitration of phenylene moieties, reduction to amines, and ring-opening of propane or butane sultones to graft sulfonic acid groups via flexible spacers, achieving homogeneous distribution along pore walls. Post-functionalization is confirmed by powder X-ray diffraction (PXRD), revealing preserved 2D hexagonal p6mm ordering and phenylene stacking. N2 physisorption shows type IV isotherms with reduced pore volumes and pore sizes. 1H NMR is used to quantify functionalization degrees. Impedance spectroscopy on pressed pellets demonstrates proton conductivities up to 2 × 10−3 S cm−1 at 30 °C and 90% RH, depending on the functionalization degree, confirming sulfonic acid-mediated conduction.}}, author = {{Wagner, Tobias and Tiemann, Michael}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, number = {{3}}, publisher = {{MDPI AG}}, title = {{{Proton-Conducting Sulfonated Periodic Mesoporous Organosilica}}}, doi = {{10.3390/nano16030203}}, volume = {{16}}, year = {{2026}}, } @book{63423, author = {{Ribbat, Christoph}}, pages = {{166}}, publisher = {{Insel}}, title = {{{In den Tag: Eine kurze Geschichte des Aufwachens}}}, year = {{2026}}, } @unpublished{64068, abstract = {{When do two irreducible polynomials with integer coefficients define the same number field? One can define an action of $\mathrm{GL}_2 \times \mathrm{GL}_1$ on the space of polynomials of degree $n$ so that for any two polynomials $f$ and $g$ in the same orbit, the roots of $f$ may be expressed as rational linear transformations of the roots of $g$; thus, they generate the same field. In this article, we show that almost all polynomials of degree $n$ with size at most $X$ can only define the same number field as another polynomial of degree $n$ with size at most $X$ if they lie in the same orbit for this group action. (Here we measure the size of polynomials by the greatest absolute value of their coefficients.) This improves on work of Bhargava, Shankar, and Wang, who proved a similar statement for a positive proportion of polynomials. Using this result, we prove that the number of degree $n$ fields such that the smallest polynomial defining the field has size at most $X$ is asymptotic to a constant times $X^{n+1}$ as long as $n\geq 3$. For $n = 2$, we obtain a precise asymptotic of the form $\frac{27}{π^2} X^2$.}}, author = {{Arango-Piñeros, Santiago and Gundlach, Fabian and Lemke Oliver, Robert J. and McGown, Kevin J. and Sawin, Will and Serrano López, Allechar and Shankar, Arul and Varma, Ila}}, booktitle = {{arXiv:2602.06943}}, title = {{{Counting number fields of fixed degree by their smallest defining polynomial}}}, year = {{2026}}, } @article{63834, abstract = {{Abstract Many Android apps collect data from users, and the European Union’s General Data Protection Regulation (GDPR) mandates clear disclosures of such data collection. However, apps often use third-party code, complicating accurate disclosures. This paper investigates how accurately current Android apps fulfill these requirements. In this work, we present a multi-layered definition of privacy-related data to correctly report data collection in Android apps. We further create a dataset of privacy-sensitive data classes that may be used as input by an Android app. This dataset takes into account data collected both through the user interface and system APIs. Based on this, we implement a semi-automated prototype that detects and labels privacy-related data collected by a given Android app. We manually examine the data safety sections of 70 Android apps to observe how data collection is reported, identifying instances of over- and under-reporting. We compare our prototype’s results with the data safety sections of 20 apps revealing reporting discrepancies. Using the results from two Messaging and Social Media apps (Signal and Instagram), we discuss how app developers under-report and over-report data collection, respectively, and identify inaccurately reported data categories. A broader study of 7,500 Android apps reveals that apps most frequently collect data that can partially identify users. Although system APIs consistently collect large amounts of privacy-related data, user interfaces exhibit some more diverse data collection patterns. A more focused study on various domains of apps reveals that the largest fraction of apps collecting personal data belong to the domain of Messaging and Social Media . Our findings show that location is collected frequently by apps, specially from the E-commerce and Shopping domain. However, it is often under-reported in app data safety sections. Our results highlight the need for greater consistency in privacy-aware app development and reporting practices. }}, author = {{Khedkar, Mugdha and Kumar Mondal, Ambuj and Bodden, Eric}}, issn = {{0928-8910}}, journal = {{Automated Software Engineering}}, number = {{2}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{A study of privacy-related data collected by Android apps}}}, doi = {{10.1007/s10515-025-00589-3}}, volume = {{33}}, year = {{2026}}, } @inbook{58969, author = {{Topalovic, Elvira and Drepper, Laura and Blachut, Alisa}}, booktitle = {{Semantische Phänomene lehren und lernen. Linguistische Berichte (LB)}}, editor = {{Bücking, Sebastian and Gese, Helga and Kellermann, Katharina}}, publisher = {{Buske}}, title = {{{Kausalität im Längsschnitt. Funktionen und Formen von weil, denn, deshalb, deswegen, nämlich und da in der Textproduktion vom 4. bis zum 6. Schuljahr}}}, year = {{2026}}, } @inbook{64178, author = {{Muller, Jil}}, booktitle = {{Automata, Cyborgs, and Mutants}}, editor = {{Muller, Jil}}, publisher = {{Palgrave Macmillan}}, title = {{{Introduction: Automata, Cyborgs, and Mutants: Eccentric Bodies from Humanism to Transhumanism}}}, doi = {{10.1007/978-3-031-93201-4_1}}, year = {{2026}}, } @inbook{64179, author = {{Muller, Jil}}, booktitle = {{Automata, Cyborgs, and Mutants}}, editor = {{Muller, Jil}}, publisher = {{Palgrave Macmillan}}, title = {{{Descartes on Clocks and Automata}}}, doi = {{10.1007/978-3-031-93201-4_5}}, year = {{2026}}, } @book{64177, editor = {{Muller, Jil}}, pages = {{368}}, publisher = {{Palgrave Macmillan}}, title = {{{Automata, Cyborgs, and Mutants }}}, doi = {{10.1007/978-3-031-93201-4}}, year = {{2026}}, } @article{64182, abstract = {{Overcoming the slow kinetics of the oxygen evolution reaction at the anode is a key challenge for the production of hydrogen via electrolysis. This reaction operates at very positive potentials, where the electrocatalyst is exposed to highly oxidative conditions and prone to potential-dependent transformation of the near-surface region. While substantial evidence for such surface restructuring exists, its extent and relevance for the catalyst’s activity are unclear. We address this topic for the case of Co3O4, one of the best-known electrocatalysts exhibiting surface restructuring, by studies of epitaxial (111)-ordered electrodeposited films with combined operando X-ray surface diffraction and absorption spectroscopy, electrochemical impedance spectroscopy, and electrochemical measurements on rotating disk electrodes. Comparison of the as-prepared and annealed state of the same samples, which both are stable even under long-term oxygen evolution conditions, provides clear insight into the role of surface defects. Our results show that defect-free annealed Co3O4(111) surfaces are structurally stable over a wide potential range and hydroxylate via adsorption at surface oxygen and Co sites. Potential-induced surface restructuring of the Co3O4 lattice occurs only in the presence of surface defects, leading to the formation of the well-known nanometer-thick oxyhydroxide skin layer. The presence of this skin layer promotes oxygen evolution at low overpotentials but results in higher Tafel slopes. As a result, highly ordered Co3O4(111) surfaces are more active at high current densities than defective Co3O4 surfaces that undergo surface restructuring. These results highlight that strategies for catalyst surface defect engineering need to be application-oriented.}}, author = {{Scharf, Carl Hendric and Chandraraj, Alex and Dyk, Konrad and Stebner, Felix and Lepin, Sören and Tian, Jing and El Bergmi Byaz, Laila and Stettner, Jochim and Leppin, Christian and Kotova, Anastasiia and Reinke, Sebastian and Linnemann, Julia and Maroun, Fouad and Magnussen, Olaf M.}}, issn = {{2155-5435}}, journal = {{ACS Catalysis}}, keywords = {{electrocatalysis, oxygen evolution reaction, cobalt spinel, operando characterization}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Role of Defects in Reversible Surface Restructuring and Activity of Co3O4 Oxygen Evolution Electrocatalysts}}}, doi = {{10.1021/acscatal.5c08785}}, year = {{2026}}, } @inbook{63793, author = {{Vernholz, Mats and Schäfers, Johannes and Jonas-Ahrend, Gabriela and Temmen, Katrin}}, booktitle = {{Smart Technologies for an All-Electric Society. STE 2025. Lecture Notes in Networks and Systems}}, editor = {{Auer, Michael E. and Langmann, Reinhard and May, Dominik and Morales, Manuel}}, isbn = {{9783032073150}}, issn = {{2367-3370}}, publisher = {{Springer Nature Switzerland}}, title = {{{Shaping Tomorrow’s Classrooms: Integrating AI in Technology Teacher Training and VET in Germany}}}, doi = {{10.1007/978-3-032-07316-7_10}}, year = {{2026}}, } @phdthesis{64563, abstract = {{Die effiziente Nutzung von Ressourcen ist in der modernen Produktentwicklung von zentraler Bedeutung, nicht nur im Hinblick auf Materialien, sondern auch angesichts des Fachkräftemangels. Dabei sollten menschliche Arbeitskräfte gezielt eingesetzt und unnötige Iterationen zwischen Abteilungen vermieden werden, wobei die Kommunikation zwischen Konstruktion und Berechnung eine entscheidende Rolle spielt. Im Rahmen dieser Arbeit wird eine Methode entwickelt, die es Konstrukteuren ermöglicht, mithilfe künstlicher neuronaler Netze schnell mechanisch optimierte Bauteilgeometrien vorzuschlagen und so Korrekturschleifen zu minimieren. Hierfür wird eine Entwicklungsumgebung analysiert, die die Integration neuronaler Netze in bestehende Konstruktions- und Optimierungsprozesse erlaubt, einschließlich der Definition von Eingaben, Ausgaben, Datenformaten, Datensätzen und Schnittstellen zu kommerzieller Software. Zur Sicher-stellung der generalisierten Nutzbarkeit der Trainingsdaten werden Bauteilgeometrien zunächst mithilfe geometrischer Primitive abstrahiert und anschließend zu Gesamtgeometrien zusammengesetzt. Die Machbarkeitsstudie zeigt, dass mechanisch optimierte Bauteilgeometrien auf diese Weise erfolgreich vorhergesagt werden können. Obwohl noch gewisse Einschränkungen bestehen hinsichtlich der Schnittstellendefinition zwischen den Primitiven oder der Umrechnung von globalen auf lokale Randbedingungen, bietet die Methode eine solide Grundlage für weiterführende Forschungsarbeiten in diesem Bereich.}}, author = {{Ott, Manuel}}, isbn = {{978-3-8191-0488-6}}, pages = {{180}}, publisher = {{Shaker Verlag}}, title = {{{Methodik zum Aufbau einer Entwicklungsumgebung für die datengetriebene Gestaltvorhersage von Bauteilen}}}, volume = {{Volume 2}}, year = {{2026}}, } @article{64569, abstract = {{Abstract We show how the Fourier transform for distributional sections of vector bundles over symmetric spaces of non‐compact type can be used for questions of solvability of systems of invariant differential equations in analogy to Hörmander's proof of the Ehrenpreis–Malgrange theorem. We get complete solvability for the hyperbolic plane and partial results for products and the hyperbolic 3‐space .}}, author = {{Olbrich, Martin and Palmirotta, Guendalina}}, issn = {{0025-584X}}, journal = {{Mathematische Nachrichten}}, number = {{2}}, pages = {{456--479}}, publisher = {{Wiley}}, title = {{{Solvability of invariant systems of differential equations on H2$\mathbb {H}^2$ and beyond}}}, doi = {{10.1002/mana.70100}}, volume = {{299}}, year = {{2026}}, } @inbook{64734, author = {{Robert, Baar and Büker, Petra and Henke, Vanessa and Seifert, Anja and Velten, Katrin}}, booktitle = {{Internationalisierung in der Grundschulpädagogik. Konzepte, Befunde und Perspektiven im deutschsprachigen Diskurs}}, editor = {{Robert, Baar and Büker, Petra and Henke, Vanessa and Seifert, Anja and Velten, Katrin}}, isbn = {{978-3-7815-2753-9}}, pages = {{285--295}}, publisher = {{Julius Klinkhardt}}, title = {{{Wie steht es um die Internationalisierung der Grundschulpädagogik? Ein erstes Fazit}}}, year = {{2026}}, } @book{64732, editor = {{Baar, Robert and Büker, Petra and Henke, Vanessa and Seifert, Anja and Velten, Katrin}}, isbn = {{978-3-7815-2753-9}}, pages = {{304}}, publisher = {{Julius Klinkhardt}}, title = {{{Internationalisierung in der Grundschulpädagogik. Konzepte, Befunde und Perspektiven im deutschsprachigen Diskurs}}}, year = {{2026}}, } @misc{64788, author = {{Schroeter-Wittke, Harald}}, booktitle = {{Theologische Literaturzeitung}}, number = {{1/2}}, pages = {{99--100}}, title = {{{Lienhard, Fritz, u. Manfred Oeming (Hgg.): Das Heilige und das Lachen. Humor und Spiritualität. Leipzig: Evangelische Verlagsanstalt 2023. 366 S. Kart. EUR 39,00. ISBN 9783374073566}}}, volume = {{151}}, year = {{2026}}, }