@unpublished{63643, abstract = {{In this short communication we discuss the ultraviolet renormalization of the van Hove-Miyatake scalar field, generated by any distributional source. An abstract algebraic approach, based on the study of a special class of ground states of the van Hove-Miyatake dynamical map is compared with an Hamiltonian renormalization that makes use of a non-unitary dressing transformation. The two approaches are proved to yield equivalent results.}}, author = {{Falconi, Marco and Hinrichs, Benjamin}}, booktitle = {{arXiv:2505.19977}}, title = {{{Ultraviolet Renormalization of the van Hove-Miyatake Model: an Algebraic and Hamiltonian Approach}}}, year = {{2025}}, } @unpublished{63645, abstract = {{In this paper we construct the non-trivial, renormalized Hamiltonian for a class of spin-boson models with supercritical form factors, including the one describing the Weisskopf-Wigner spontaneous emission. The renormalization is performed through both a self-energy and mass renormalization, in the so-called Hamiltonian formalism of constructive quantum field theory, implemented by a non-unitary dressing transformation. This solves the problem of triviality for unitarily-renormalized supercritical spin-boson models.}}, author = {{Falconi, Marco and Hinrichs, Benjamin and Valentín Martín, Javier}}, booktitle = {{arXiv:2508.00805}}, title = {{{Non-Trivial Renormalization of Spin-Boson Models with Supercritical Form Factors}}}, year = {{2025}}, } @unpublished{63646, abstract = {{We study the behavior of a probability measure near the bottom of its support in terms of time averaged quotients of its Laplace transform. We discuss how our results are connected to both rank-one perturbation theory as well as renewal theory. We further apply our results in order to derive criteria for the existence and non-existence of ground states for a finite dimensional quantum system coupled to a bosonic field.}}, author = {{Hinrichs, Benjamin and Polzer, Steffen}}, booktitle = {{arXiv:2511.02867}}, title = {{{Wiener-Type Theorems for the Laplace Transform. With Applications to Ground State Problems}}}, year = {{2025}}, } @unpublished{63647, abstract = {{We study the convergence rate of translation-invariant discrete-time quantum dynamics on a one-dimensional lattice. We prove that the cumulative distributions function of the ballistically scaled position $\mathbb X(n)/{n}$ after $n$ steps converges at a rate of $n^{-1/3}$ in the Lévy metric as $n\to\infty$. In the special case of step-coin quantum walks with two-dimensional coin space, we recover the same convergence rate for the supremum distance and prove optimality.}}, author = {{Hinrichs, Benjamin and Mittenbühler, Pascal}}, booktitle = {{arXiv:2511.13409}}, title = {{{On the Optimal Rate of Convergence for Translation-Invariant 1D Quantum Walks}}}, year = {{2025}}, } @unpublished{63135, abstract = {{We propose a definition of Coxeter-Dynkin algebras of canonical type generalising the definition as a path algebra of a quiver. Moreover, we construct two tilting objects over the squid algebra - one via generalised APR-tilting and one via one-point-extensions and reflection functors - and identify their endomorphism algebras with the Coxeter-Dynkin algebra. This shows that our definition gives another representative in the derived equivalence class of the squid algebra, and hence of the corresponding canonical algebra. Finally, we have a closer look at the Grothendieck group and the Euler form which illustrates the connection to Saito's classification of marked extended affine root systems. On the other hand, this enables us to prove that in the domestic case Coxeter-Dynkin algebras are of finite representation type.}}, author = {{Perniok, Daniel}}, title = {{{Coxeter-Dynkin algebras of canonical type}}}, year = {{2025}}, } @unpublished{63620, abstract = {{We introduce a new class of reflection groups associated with the canonical bilinear lattices of Lenzing, which we call reflection groups of canonical type. The main result of this work is a categorification of the corresponding poset of non-crossing partitions for any such group, realized via the poset of thick subcategories of the category of coherent sheaves on an exceptional hereditary curve generated by an exceptional sequence. A second principal result, essential for the categorification, is a proof of the transitivity of the Hurwitz action in these reflection groups.}}, author = {{Baumeister, Barbara and Burban, Igor and Neaime, Georges and Schwabe, Charly Merlin}}, booktitle = {{arXiv:2512.01729}}, title = {{{Non-crossing partitions for exceptional hereditary curves}}}, year = {{2025}}, } @article{63649, author = {{Glöckner, Helge and Schmeding, Alexander and Suri, Ali}}, issn = {{2972-4589}}, journal = {{Geometric Mechanics}}, number = {{04}}, pages = {{383--437}}, publisher = {{World Scientific Pub Co Pte Ltd}}, title = {{{Manifolds of continuous BV-functions and vector measure regularity of Banach–Lie groups}}}, doi = {{10.1142/s2972458925500029}}, volume = {{01}}, year = {{2025}}, } @techreport{63650, author = {{Kaufmann, Jonas and Schreiner, Nick and Koldewey, Christian and Fichtler, Timm and Sommer, Franziska and Sedlmeier, Joachim and Hocken, Christian and Rabe, Martin and Kühn, Arno}}, title = {{{Breaking Barriers: Implementing IoT-enabled Smart Services for Competitive Advantage}}}, doi = {{10.13140/RG.2.2.19531.50723}}, year = {{2025}}, } @techreport{63651, author = {{Grigoryan, Khoren and Lamarz, Jessica and Martin, Lucas and Asmar, Laban and Rabe, Martin and Kühn, Arno and Fichtler, Timm and Petzke, Lisa Irene and Bruchhage, Felix and Koldewey, Christian}}, title = {{{product.intelligence - Datenbasiertes Produktmanagement}}}, doi = {{10.24406/PUBLICA-4198}}, year = {{2025}}, } @article{63659, abstract = {{ Objectives To date, consistent evidence for consequences of heading in football (soccer) on the structure and function of the brain is lacking, but first studies indicate a potential effect of specific high-magnitude headers. The purpose of this longitudinal, prospective study was to investigate whether potential structural and/or functional alterations within the brain were associated with (high-magnitude) heading. Methods 3T MRI sequences were obtained from active high-level male players before and after an observation period of 17.2 months (median). Cortical thickness and grey matter (GM) volume were investigated on a whole-brain level. Functional connectivity (FC) was analysed in the default mode network (DMN) and salience network (SN). During the observation period, each training and each match was videotaped and evaluated regarding the heading exposure. Significant structural and functional findings were subsequently correlated with specific header characteristics. Results 14 included participants (mean age: 20.36±3.34 years) played 5822 headers. GM volume remained unchanged, whereas cortical thickness decreased minimally from pre-measurement to post-measurement in a left precentral region (mean change: 0.048±0.128 mm; clusterwise p=0.0416). Within the SN, FC increased in one cluster (false discovery rate corrected p=0.026). FC remained stable within the DMN and between DMN and SN. Change from pre-measurement to post-measurement for the significant results did not correlate with heading variables. Conclusion Our findings may indicate no cumulative effect of heading during the observation period. As these results contrast with cross-sectional findings, more longitudinal, prospective studies with a greater sample size are urgently needed to understand potential heading effects. }}, author = {{Mund, Franziska Katharina and Feddermann-Demont, Nina and Welsch, Goetz H and Schuenemann, Carsten and Fiehler, Jens and Thaler, Christian and Meyer, Lukas and Reeschke, Rebecca and Reinsberger, Claus}}, issn = {{2055-7647}}, journal = {{BMJ Open Sport & Exercise Medicine}}, number = {{4}}, publisher = {{BMJ}}, title = {{{High-magnitude headers are not associated with structural and functional brain changes in active high-level football (soccer) players}}}, doi = {{10.1136/bmjsem-2025-002636}}, volume = {{11}}, year = {{2025}}, } @inproceedings{62814, abstract = {{Porous carbons are prominent electrode materials in energy storage applications such as supercapacitors. However, rational materials development is hampered by difficulties in interpreting electrochemical impedance spectra (EIS) and drawing conclusions about promising aspects of device improvement. Here, we characterized electrodes consisting of activated carbon with polyacrylic acid binder in four different concentrations of sulfuric acid, using cyclic voltammetry and electrochemical impedance spectroscopy. Both datasets were evaluated with simple equivalent circuits and comparatively analyzed. Conductivity of the electrolyte was independently measured. Cyclic voltammograms (CV) show larger resistance and capacitance at low scan rates. Resistances obtained from EIS are in good agreement with those obtained by cyclic voltammograms particularly at high scan rates. The comparison against specific electrolyte resistance can reveal whether resistances within the solid electrode architecture or resistances within the electrolyte, partially confined by pores, are the dominant cause of increased resistance at low scan rate. Comparison between CV and EIS points to the main electrode capacitance being described by a constant phase element (CPE) used to fit the low-frequency region of EIS.}}, author = {{Reinke, Sebastian and Khamitsevich, Vera and Linnemann, Julia}}, booktitle = {{2024 International Workshop on Impedance Spectroscopy (IWIS)}}, keywords = {{electrochemical impedance spectroscopy, distorted cyclic voltammograms, supercapacitors, carbon}}, publisher = {{IEEE}}, title = {{{Complementary Analysis of Cyclic Voltammograms and Impedance Spectra of Porous Carbon Electrodes}}}, doi = {{10.1109/iwis63047.2024.10847115}}, year = {{2025}}, } @article{63660, abstract = {{Adiabatic demagnetization refrigeration (ADR) is regaining relevance for refrigeration to temperatures below 1 K as global helium-3 supply is increasingly strained. While ADR at these temperatures is long established with paramagnetic hydrated salts, more recently, frustrated rare-earth oxides were found to offer higher entropy densities and practical advantages, since they do not degrade under heating or evacuation. We report structural, magnetic, and thermodynamic properties of the rare-earth borates Ba3XB9O18 and Ba3XB3O9 with X = (Yb, Gd). Except for Ba3GdB9O18, which orders at 108 mK, the three other materials remain paramagnetic down to their lowest measured temperatures. ADR performance starting at 2 K in a field of 5 T is analyzed and compared to literature.}}, author = {{Klinger, Marvin and Treu, Tim and Kreisberger, Felix and Heil, Christian and Klinger, Anna and Jesche, Anton and Gegenwart, Philipp}}, issn = {{2076-3417}}, journal = {{Applied Sciences}}, number = {{1}}, publisher = {{MDPI AG}}, title = {{{Sub-1 K Adiabatic Demagnetization Refrigeration with Rare-Earth Borates Ba3XB9O18 and Ba3XB3O9, X = (Yb, Gd)}}}, doi = {{10.3390/app16010290}}, volume = {{16}}, year = {{2025}}, } @inbook{60190, author = {{Cyrkel, Jakob}}, booktitle = {{Data - Culture - Society. Kulturwissenschaftliche Perspektiven auf Data Society als gesellschaftliche Transformation}}, editor = {{Uppenkamp, Vera and Vösgen-Nordloh, Meike}}, pages = {{179--200}}, publisher = {{wbg Academic}}, title = {{{Perspektiven auf Mikropolitiken der Psychotherapie mit Virtual Reality – oder: „From Training to Toy to Treatment”}}}, doi = {{10.17619/UNIPB/1-2411}}, volume = {{2}}, year = {{2025}}, } @book{63007, editor = {{Güneşli, Habib and Albers, Timm and Mombeck, Mona Maria and Jesuthasan, Jonitta}}, isbn = {{978-3-7799-8994-3}}, publisher = {{Beltz Juventa }}, title = {{{Diskurse und Praktiken der Heterogenität. Pädagogisches Handeln in heterogenen Settings. Mit einem Fokus auf die Elementar- und Primarbildung}}}, year = {{2025}}, } @misc{60593, author = {{Elit, Stefan}}, booktitle = {{Kempowski-Jahrbuch}}, isbn = {{9783111636283}}, number = {{4}}, pages = {{281--286}}, publisher = {{de Gruyter}}, title = {{{Buchbesprechung: Brixa, Anna: Der ›dunkle‹ Kempowski. Kempowski anders lesen. München. Belleville 2025 (Theorie und Praxis der Interpretation 13)}}}, doi = {{10.1515/9783111636573-017}}, year = {{2025}}, } @inbook{63695, author = {{Dopheide, Fredericke and Freitag, Christine and Spiekenheuer, Mara}}, booktitle = {{Diskurse und Praktiken der Heterogenität}}, editor = {{Güneşli, Habib and Albers, Timm and Mombeck, Mona Maria and Jesuthasan, Jonitta}}, isbn = {{9783779989950}}, pages = {{201--210}}, publisher = {{Beltz Juventa}}, title = {{{Heterogenität adressieren. Befunde aus der Praxis im Projekt Balu und Du am Standort Paderborn}}}, doi = {{10.3262/978-3-7799-8995-0}}, year = {{2025}}, } @article{59167, author = {{Thomas, Sven}}, journal = {{HannahArendt.Net}}, number = {{1}}, pages = {{240–242}}, title = {{{Rezension: Thomas Meyers neue Arendt Biographie. Sinnbild der Verstrickung von Theorie und Praxis}}}, doi = {{10.57773/HANET.V14I1.607}}, volume = {{14}}, year = {{2025}}, } @inproceedings{63697, author = {{Stallmeister, Lea and Rezat, Sebastian}}, booktitle = {{Beiträge zum Mathematikunterricht 2025. 58. Jahrestagung der Gesellschaft für Didaktik der Mathematik}}, editor = {{Schick, Lisa and Platz, Melanie and Lambert, Anselm}}, location = {{Universität des Saarlandes, Saarbrücken}}, publisher = {{WTM-Verlag}}, title = {{{Die Bedeutung des Mathematikschulbuchs in Zeiten der Ressourcenvielfalt}}}, doi = {{10.17877/DE290R-26373}}, year = {{2025}}, } @inproceedings{62062, author = {{Neufeld, Inga and Häsel-Weide, Uta}}, booktitle = {{Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14)}}, editor = {{Bosch, M. and Bolondi, G. and Carreira, S. and Spagnolo, C. and Gaidoschik, M.}}, location = {{Bozen, Italy}}, title = {{{Learning support practices in the fostering of basic arithmetic skills}}}, year = {{2025}}, } @inproceedings{62063, author = {{Häsel-Weide, Uta and Nührenbörger, Marcus}}, booktitle = {{Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14)}}, editor = {{Bosch, M. and Bolondi, G. and Carreira, S. and Spagnolo, C. and Gaidoschik, M.}}, location = {{Bozen, Italy}}, title = {{{Practices in math discourses in inclusive primary school}}}, year = {{2025}}, }