@inproceedings{65606, abstract = {{Sound capture by microphone arrays opens the possibility to exploit spatial, in addition to spectral, information for diarization and signal enhancement, two important tasks in meeting transcription. However, there is no one-to-one mapping of positions in space to speakers if speakers move. Here, we address this by proposing a novel joint spatial and spectral mixture model, whose two submodels are loosely coupled by modeling the relationship between speaker and position index probabilistically. Thus, spatial and spectral information can be jointly exploited, while at the same time allowing for speakers speaking from different positions. Experiments on the LibriCSS data set with simulated speaker position changes show great improvements over tightly coupled subsystems.}}, author = {{Meise, Adrian Tobias and Cord-Landwehr, Tobias and Boeddeker, Christoph and Delcroix, Marc and Nakatani, Tomohiro and Haeb-Umbach, Reinhold}}, booktitle = {{ICASSP 2026 - 2026 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}}, keywords = {{mixture models, meeting processing, diarization, source separation}}, location = {{Barcelona}}, publisher = {{IEEE}}, title = {{{Loose Coupling of Spectral and Spatial Models for Multi-Channel Diarization and Enhancement of Meetings in Dynamic Environments}}}, doi = {{10.1109/icassp55912.2026.11463540}}, year = {{2026}}, } @article{65631, abstract = {{Abstract Mathematics textbooks used to be the key resource for students’ self-regulated learning of mathematics. Primarily due to the digitalization of society, students have potentially greater access to a wider range of resources such as internet search engines, learning platforms, educational videos, and Generative AI. This study investigates the role of the mathematics textbook in comparison to other resources within students’ self-regulated learning practices. Data were collected via a survey of 1101 German secondary students, representing three school types ( Gymnasium , Gesamtschule , Realschule ) and three grade levels (6, 9, and upper secondary). The questionnaire assessed the frequency of resource use in and outside class, reasons and purposes of use, and resource-based strategies when facing learning challenges outside class. Results show that the printed mathematics textbook is the most frequently used resource both in class and outside class. The textbook remains the most relevant resource for key purposes, such as an aid for doing homework and preparing for tests and exams. However, its dominance diminishes with age: in upper secondary school, students increasingly rely on self-created notes, and online resources. Correlation analyses reveal moderate to strong links between in-class and out-of-class use, suggesting an association between resource use and classroom culture. The findings underscore the textbook’s enduring centrality as a foundational, trusted resource within a dynamic and increasingly diverse learning environment. This study calls for pedagogical approaches that integrate textbooks more intentionally within broader resource systems, supporting students’ agency and strategic resource selection in an era of digital abundance. }}, author = {{Stallmeister, Lea and Rezat, Sebastian}}, issn = {{0013-1954}}, journal = {{Educational Studies in Mathematics}}, keywords = {{mathematics, textbooks, userstudy, resources, digital resources, students, secondary eduction}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{The role of the mathematics textbook in times of resource diversity}}}, doi = {{10.1007/s10649-026-10511-7}}, year = {{2026}}, } @article{65630, abstract = {{Mathematics textbooks used to be the key resource for students’ self-regulated learning of mathematics. Primarily due to the digitalization of society, students have potentially greater access to a wider range of resources such as internet search engines, learning platforms, educational videos, and Generative AI. This study investigates the role of the mathematics textbook in comparison to other resources within students’ self-regulated learning practices. Data were collected via a survey of 1101 German secondary students, representing three school types (Gymnasium, Gesamtschule, Realschule) and three grade levels (6, 9, and upper secondary). The questionnaire assessed the frequency of resource use in and outside class, reasons and purposes of use, and resource-based strategies when facing learning challenges outside class. Results show that the printed mathematics textbook is the most frequently used resource both in class and outside class. The textbook remains the most relevant resource for key purposes, such as an aid for doing homework and preparing for tests and exams. However, its dominance diminishes with age: in upper secondary school, students increasingly rely on self-created notes, and online resources. Correlation analyses reveal moderate to strong links between in-class and out-of-class use, suggesting an association between resource use and classroom culture. The findings underscore the textbook’s enduring centrality as a foundational, trusted resource within a dynamic and increasingly diverse learning environment. This study calls for pedagogical approaches that integrate textbooks more intentionally within broader resource systems, supporting students’ agency and strategic resource selection in an era of digital abundance.}}, author = {{Stallmeister, Lea and Rezat, Sebastian}}, journal = {{Educational Studies in Mathematics}}, publisher = {{Springer}}, title = {{{The role of the mathematics textbook in times of resource diversity}}}, doi = {{10.1007/s10649-026-10511-7}}, year = {{2026}}, } @article{65682, author = {{Vernholz, Mats and Sims, Craig and Treagust, David}}, journal = {{Education Sciences}}, number = {{5}}, pages = {{782}}, title = {{{From Time-Saving to Skill-Building: Reframing Generative AI for Lesson-Planning—A Conceptual Design Paper}}}, doi = {{https://doi.org/10.3390/educsci16050782}}, volume = {{16}}, year = {{2026}}, } @article{65730, abstract = {{Abstract Is explainable AI feasible and desirable, and are explanations of AI decisions always good? Many answer this question in the affirmative, but there is a growing discourse that is suspicious of the promises of explainable AI used to explain decisions towards users, considering it unfeasible, undesirable, and even potentially misleading. Could explainable AI be just a rhetorical foil? This paper proposes that, yes, explainable AI is a rhetorical technology but no, this does not necessarily make it undesirable. It starts by revisiting this debate according to the initial charge against rhetorics by Plato and Aristotle’s response, considering rhetoric pharmacologically, as not only a poison but also a cure for political life. It argues that, just as rhetoric was necessary to take care of the temporalities of public life, in court, the public event, and the assembly, so may explainable AI contribute to a rhetorical context. Yet, whether it does so is conditioned on the extent to which it cultivates the civic virtues relative to a respective context. The paper considers the examples of predictive policing, credit scoring, and prediction markets to argue about ideal states – civic virtues that may be cultivated in each appropriate context – and deviations that point at the risks of explainable AI to lead to domination, conformism, and political recalcitrance.}}, author = {{Reijers, Wessel}}, issn = {{0167-7411}}, journal = {{Topoi}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Explainable AI as a Rhetorical Technology: Promoting Civic Virtue in the Age of AI}}}, doi = {{10.1007/s11245-026-10451-0}}, year = {{2026}}, } @techreport{65737, abstract = {{We examine German individuals' preferences for income and wealth taxation and, importantly, the interplay between these two tax instruments. While prior research often examines wealth tax preferences in isolation, actual tax systems consist of multiple interacting taxes. To capture this dynamic, we elicit preferred tax burdens in a large-scale online experiment with 2,702 participants randomly assigned to one of four treatment groups: respondents state either an unspecified overall tax burden, separate income and wealth tax burdens, an income tax burden only, or a wealth tax burden only. Our baseline estimates reveal average (marginal) tax rates of approximately 17.4% (18.9%) for income and 4.1% (2.3%) for wealth. We find that participants associate wealth with an ability-to-pay taxes: when a wealth tax is not explicitly available, preferred income tax rates are approximately 30% higher. However, when both instruments are available, participants do not treat them as substitutes. Instead, they appear to treat the two taxes as separate mental bins: the standalone income and wealth tax burdens are combined in a notably additive manner, resulting in a significantly higher overall tax burden. Further, respondents apply implicit exemptions for low levels of wealth and favor a wealth tax base focused primarily on financial assets and real estate other than the primary residence.}}, author = {{Maiterth, Ralf and Piper, Yuri and Schneider, Cornelius}}, title = {{{Preferences for Taxing Wealth and Income}}}, doi = {{10.2139/ssrn.6832418}}, year = {{2026}}, } @article{65757, abstract = {{Electrifying the heating sector is essential for achieving global climate targets like the Paris Agreement’s 1.5 °C goal. In Germany, where 80 % of household energy goes to space heating and hot water, shifting to low-carbon solutions is crucial. Fossil-fuelled district heating networks can incorporate renewable energy via heat pumps, improving efficiency. Although heat pump design typically favours minimal temperature lifts, higher lifts can be economically viable with low electricity prices and abundant renewables. Adding thermal energy storage boosts operational flexibility. This study explores a flexible heat pump operation incorporating part load behaviour with a thermal energy storage in a German city’s district heating system to minimise costs and carbon dioxide emissions. Using a mixed-integer linear programming model, it examines the impact of temperature adjustments and storage on system efficiency. The results show that the integration of a heat pump in a district heating system reduces operating costs. Compared to a supply without a heat pump, with levelised cost of heating of 9.98 cent/kWhth and a fixed operating mode with costs between 9.96 cent/kWhth and 11.49 cent/kWhth, the flexible use results in lowest costs of 9.85 cent/kWhth, while also reducing overall CO2 emissions. Using a full factorial sensitivity analysis, the levelised cost of heating ranged between 9.15 cent/kWhth in the best case and 10.37 cent/kWhth in the worst case for the selected configuration.}}, author = {{Rahlf, Henning Christoph and Divkovic, Denis and Knorr, Lukas and Schlosser, Florian and Meschede, Henning}}, issn = {{0196-8904}}, journal = {{Energy Conversion and Management}}, keywords = {{Heat transition, Optimisation, Temperature flexibility, Decarbonisation, Multi energy}}, publisher = {{Elsevier BV}}, title = {{{Flexible operation strategies for heat pumps in district heating systems using dynamic electricity prices}}}, doi = {{10.1016/j.enconman.2026.121714}}, volume = {{364}}, 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}}, } @article{65585, abstract = {{This article explores the relativity of Islamic normativity through the taṣwīb doctrine (kullu mujtahid muṣīb) as formulated by al-ʿAnbarī and received by al-Jāḥiẓ (d. 255/869), al-Jaṣṣāṣ (d. 370/981), and al-Baṣrī (d. 436/1044). Al-Jaṣṣāṣ reinterprets the thesis through the ḥanafī principle of ashbah bi-l-aṣl as a hermeneutical-methodological approach; al-Baṣrī elaborates it into an epistemo-logical model of normative plurality, while al-Jāḥiẓ articulates a soteriological theory of moral responsibility in the context of kalām. The analysis shows that classical Islamic legal theory developed a distinct modelof normativity that maintains binding force under conditions of pluralism and uncertainty. The article calls for renewed engagement with this tradition in contemporary debates on religious normativity and legal pluralism.}}, author = {{Abdelrahem, Mohammed}}, issn = {{2941-122X}}, journal = {{Forum Islamic-Theological Studies}}, keywords = {{IslamicTheology, Usul al-Fiqh, taswib, islamische Rechtsphilosophie, LegalTheory, Pluralism, OpenAccess}}, number = {{1}}, pages = {{94--111}}, publisher = {{LibreCat University}}, title = {{{Zur Relativität islamischer Normativität: Diskurslinien der taṣwīb-Lehre von al-Ǧāḥiẓ (gest. 869) zu al-Ǧaṣṣāṣ (gest. 981) und al-Baṣrī (gest. 1044) }}}, doi = {{10.71573/2941-122X_2026_5-1_154}}, volume = {{Vol. 5 (2026)}}, year = {{2026}}, } @article{65785, abstract = {{Simulation-based design of high-power ultrasonic systems depends on the accurate modelling of the electromechanical behaviour of piezoceramic materials. In practical transducer applications, the relevant operating points are influenced by mechanical preload and heating, both of which give rise to changes in the elastic, dielectric, and piezoelectric material properties. Material parameters identified under idealised, unloaded conditions are therefore insufficient to represent piezoceramic material behaviour under realistic operating conditions. To overcome this limitation, experimental setups are developed that enable the measurement of electrical impedance spectra under controlled thermal and mechanical conditions. The acquired impedance data are used in an inverse identification procedure, in which the behaviour of a finite element forward model is iteratively fitted to the measurements using a block coordinate descent optimisation strategy guided by a sensitivity analysis. This yields effective linear material parameters as a function of temperature and mechanical stress at varying operating points. The identified temperature-dependent parameters, for instance, can be employed in a coupled thermo-electromechanical simulation framework to predict the temperature-dependent material behaviour during operation. The linear identification based on varying operation points provides an initial approximation of the nonlinear material response, establishing a basis for the development of corresponding nonlinear material models.}}, author = {{Friesen, Olga and Claes, Leander and Hölscher, Jonas and Henning, Bernd and Scheidemann, Claus and Hemsel, Tobias and Kuess, Raphael and Walther, Andrea and Spieker, Carsten and Förstner, Jens}}, issn = {{0171-8096}}, journal = {{tm - Technisches Messen}}, keywords = {{tet_topic_piezo}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Measurement of multiphysical material parameters of piezoceramic components for high-power ultrasonic applications}}}, doi = {{10.1515/teme-2026-0042}}, year = {{2026}}, } @article{65821, author = {{Gräßler, Iris and Rarbach, Sven and Pottebaum, Jens and Luessen, Florian and Hoffmann, Joerg}}, issn = {{2212-8271}}, journal = {{Procedia CIRP}}, pages = {{587--592}}, publisher = {{Elsevier BV}}, title = {{{Metadata Model for Engineering of Sustainable Products in Value Creation Networks}}}, doi = {{10.1016/j.procir.2026.05.099}}, volume = {{140}}, year = {{2026}}, } @article{65820, author = {{Gräßler, Iris and Rarbach, Sven and Pottebaum, Jens and Hoffmann, Joerg}}, issn = {{2212-8271}}, journal = {{Procedia CIRP}}, pages = {{245--250}}, publisher = {{Elsevier BV}}, title = {{{Metadata-based assessment of Data Quality for Engineering of Sustainable Products}}}, doi = {{10.1016/j.procir.2026.05.255}}, volume = {{142}}, year = {{2026}}, } @article{65831, author = {{Blumberg, Eva and Wenzel, Annkathrin and Schulze, Jan Roland and Reckmann, Eileen and Puppe, Ricardo and Crummenerl, Lena Luise and Temmen, Katrin}}, journal = {{GDSU-Journal}}, pages = {{186--201}}, title = {{{„transMINT4.0“ – MINT-Bildung stärken durch die Ein- bindung außerschulischer Lernorte am Übergang von der Primar- zur Sekundarstufe}}}, volume = {{16}}, year = {{2026}}, } @article{65476, abstract = {{Service research has evolved into an interdisciplinary research field that bridges diverse disciplines, including information systems (IS) and marketing. Nearly two decades ago, the service system concept was introduced as a foundational abstraction in service research, drawing on ideas from the service-dominant logic (S-D logic) of marketing. Despite its widespread adoption in service research, particularly in the IS discipline, the service system concept lacks a solid theoretical foundation. This has resulted in conceptual ambiguity and overlap with related constructs, such as service ecosystems. Moreover, it has largely remained a static analytical lens, insufficiently capturing dynamic service phenomena, including value co-creation and co-destruction, as well as the emergence of institutional arrangements. To address these limitations, we propose Luhmann’s systems theory (LST) as a robust framework for conceptualizing service systems as autopoietic (self-creating) systems, in which communication serves as the fundamental mechanism that drives value co-creation. We derive five theoretical propositions from this re-conceptualization that clarify conceptual ambiguity and allow researchers to explore dynamic service phenomena in greater depth. Given LST’s general approach, our conceptualization provides a theoretically grounded, interdisciplinary foundation for advancing service research.}}, author = {{Beverungen, Daniel and Poeppelbuss, Jens and Hemmrich, Simon and Iqbal, Taskeen}}, issn = {{1019-6781}}, journal = {{Electronic Markets}}, keywords = {{Service system, Service ecosystem, Systems theory, Service research}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Service through communication—Conceptualizing service systems with Luhmann’s systems theory}}}, doi = {{10.1007/s12525-026-00889-w}}, volume = {{36}}, year = {{2026}}, } @article{65847, abstract = {{Simulating vibronic spectra is a central task in physical chemistry, offering insight into important properties of molecules. Recently, it has been experimentally demonstrated that photonic platforms based on Gaussian boson sampling (GBS) are capable of performing these simulations. However, whether an actual GBS approach is required depends on the molecule under investigation. To develop a better understanding on the requirements for simulating vibronic spectra, we explore connections between theoretical approximations in physical chemistry and their photonic counterparts. Mapping these approximations into photonics, we show that for certain molecules the GBS approach is unnecessary. We place special emphasis on the linear coupling approximation, which in photonics corresponds to sampling from multiple coherent states. By implementing this approach in experiments, we demonstrate improved similarities over previously reported GBS results for formic acid and identify the particular attributes that a molecule must exhibit for this, and other approximations, to be valid. These results highlight the importance in forming deeper connections between traditional methods and photonic approaches.}}, author = {{Eickmann, Jan-Lucas and Luo, Kai-Hong and Roiz, Mikhail and Lammers, Jonas and Atzeni, Simone and Pandey, Cheeranjiv and Lütkewitte, Florian and Shirazi, Reza G. and Schlue, Fabian and Brecht, Benjamin and Rybkin, Vladimir V. and Stefszky, Michael and Silberhorn, Christine}}, issn = {{2056-6387}}, journal = {{npj Quantum Information}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra}}}, doi = {{10.1038/s41534-026-01250-x}}, volume = {{12}}, year = {{2026}}, } @article{65865, abstract = {{Mathematical problem solving is a highly complex competence that needs to be supported throughout the learning process. This study examines the role of problem-solving heuristics among 73 sixth-grade students in a German secondary school (Gesamtschule). Specifically, we focus on the empirical relationship between the occurrence of heuristics, their suitability, and application, as well as their contribution to problem-solving success. To this end, we developed a heuristic training that introduced strategy keys (heuristic aid cards) accompanied by explanatory videos. By leveraging variations in the successful application of the heuristics between students and across multiple sessions (73 students in 4 training situations and 3 problems in a final test), we discover from regression models with student and task-fixed effects that a successful use of heuristics (i.e., an heuristic occurred, that heuristic had a high suitability regarding the problem, and it was applied correctly) leads to more successful mathematical problem solving. Regarding the underlying mechanism, we find that all dimensions of heuristic use (occurrence, suitability, and application of heuristics) are positively related to problem-solving success. When comparing the predictive capacity of all three aspects, we identified the correct application of heuristics as particularly conducive for better problem-solving success. In comparing the group of students with high to those with low initial math competence, we find no significant differences in the relationship between heuristic use and problemsolving success across achievement groups. Our results emphasize the crucial role of heuristic application in mathematical problem solving, which generally benefits students regardless of their overall math competence.}}, author = {{Herold-Blasius, Raja and Kleinschmidt, Hannah and Ziller, Conrad}}, journal = {{Journal für Mathematik-Didaktik}}, number = {{6}}, title = {{{Dimensions of Heuristic Use in Mathematical Problem Solving: Evidence from Early Secondary School Students}}}, doi = {{https://doi.org/10.1007/s13138-026-00270-6}}, volume = {{47}}, year = {{2026}}, } @inbook{65915, author = {{Jesinghausen, Steffen and Schmid, Hans-Joachim}}, booktitle = {{Opus Fluidum Futurum—Rheology of Reactive, Multiscale, Multiphase Construction Materials}}, title = {{{Adaptive Coaxial Concrete Rheometer (ACCR): Honest Rheological Measurements and Corrections}}}, doi = {{10.1007/978-3-032-15391-3}}, year = {{2026}}, } @article{65919, author = {{Öhlschläger, Claudia}}, journal = {{Geschlecht und Macht (feministische studien)}}, number = {{1}}, pages = {{82--98}}, publisher = {{de Gruyter}}, title = {{{Metamorphosen als Akte weiblicher Handlungsmacht in Texten von Brigitte Kronauer, Han Kang und Camilla Grudova}}}, doi = {{https://doi.org/10.1515/fs-2026-0006}}, volume = {{44}}, year = {{2026}}, } @article{65920, author = {{Öhlschläger, Claudia}}, journal = {{Geschlecht und Macht (feministische studien)}}, number = {{1}}, pages = {{129--134}}, publisher = {{de Gruyter}}, title = {{{Zu Fotografien der Berliner Künstlerin Cihan Çakmak}}}, doi = {{https://doi.org/10.1515/fs-2026-0010}}, volume = {{44}}, year = {{2026}}, } @article{65918, author = {{Öhlschläger, Claudia and Riegraf, Birgitt}}, journal = {{Geschlecht und Macht (feministische studien)}}, number = {{1}}, pages = {{5--14}}, publisher = {{de Gruyter}}, title = {{{Geschlecht und Macht}}}, doi = {{https://doi.org/10.1515/fs-2026-0001}}, volume = {{44}}, year = {{2026}}, }