@article{63452, abstract = {{ABSTRACT The chemical reactivity of molecules can be controlled by a variety of effects, ranging from chemical reagents to purely physical stimuli. Metal tips employed in scanning probe microscopy are an elegant tool to manipulate reactive centers in single molecules. However, to achieve excellent control over distance and orientation, it is crucial to immobilize the reactive center and align it along the direction of the tip. Here, we aligned a reactive alkyne center via a rigid triphenylmethane‐based tripod for upright adsorption on Au(111) for inducing bond weakening in the alkyne moiety by approaching a silver tip. Single‐molecule ultrahigh vacuum low‐temperature tip‐enhanced Raman scattering was employed for probing tip‐induced bond weakening in the gap distance range from 550 to 250 pm. Both the ≡C–H stretching at ~3330 cm −1 and the dominant –C≡C– stretching peak at ~2130 cm −1 exhibit a shift to smaller wavenumbers due to tip‐induced bond weakening and an exponential increase in Raman intensity originating from the increased local electric field in the nanogap. To rationalize the underlying physical contributions and chemical effects of tip‐induced bond weakening, density functional theory calculations for gap distances in the range 800 to 100 pm were performed. The computational results confirmed the presence of different gap distance regimes including the onset of Pauli repulsion for short distances; for the latter, the calculations additionally predict structural distortions of the terminal alkyne induced by the nearby metal tip. These findings allow us to set a lower limit for the tip–tripod gap distance in studies requiring an intact upright configuration of the alkyne‐tripod, for example, electric field‐induced chemistry. }}, author = {{Li, Gang and Mennicken, Simon and Zhu, Lu‐Yao and Ehtesabi, Sadaf and Reichenauer, Till and Kupfer, Stephan and Schäfer, Daniel and Mehrparvar, Saber and Haberhauer, Gebhard and Zhang, Yao and Gräfe, Stefanie and Schlücker, Sebastian and Dong, Zhen‐Chao}}, issn = {{0377-0486}}, journal = {{Journal of Raman Spectroscopy}}, publisher = {{Wiley}}, title = {{{Probing Metal Tip‐Induced Bond Weakening of a Reactive Alkyne Center Aligned via a Rigid Triphenylmethane‐Based Tripod on Au(111) by TERS and DFT}}}, doi = {{10.1002/jrs.70084}}, year = {{2025}}, } @inproceedings{63457, author = {{Moritzer, Elmar and Völklein, Paul Leonhard}}, booktitle = {{Technomer 2025 29. Fachtagung}}, isbn = {{978-3-939382-17-1}}, keywords = {{Faserverstärkte Kunststoffe (FVK), mechanischens Fügen, Nieten, Organobleche}}, title = {{{Untersuchung des Erwärmverhaltens von Organoblechen mittels IR-Strahlung für das Fügen im Stempelnietverfahren}}}, year = {{2025}}, } @article{63456, abstract = {{Externer Doktorand von Moritzer}}, author = {{Moritzer, Elmar and Bartmann, Finn and Riedl, Alexander}}, journal = {{1. XXIV Dichtungskolloquium (Essen Juni 2025)}}, title = {{{Berücksichtigung des Kriechverhaltens bei numerischen Simulationen von Thermoplastflanschverbindungen}}}, year = {{2025}}, } @article{63505, abstract = {{Abstract The main goal of this work is to study the $L^{p}$-asymptotic behavior of solutions to the heat equation on arbitrary rank Riemannian symmetric spaces of non-compact-type $G/K$ for non-bi-$K$ invariant initial data. For initial data $u_{0}$ compactly supported or in a weighted $L^{1}(G/K)$ space with a weight depending on $p\in [1, \infty ]$, we introduce a mass function $M_{p}(u_{0})(\cdot )$, and prove that if $h_{t}$ is the heat kernel on $G/K$, then $$ \begin{align*} &\|h_t\|_p^{-1}\,\|u_0\ast h_t \, - \,M_p(u_0)(\cdot)\,h_t\|_p \rightarrow 0 \quad \textrm{as} \quad t\rightarrow \infty.\end{align*} $$ Interestingly, the $L^{p}$ heat concentration leads to completely different expressions of the mass function for $1\leq p <2$ and $2\leq p\leq \infty $. If we further assume that the initial data are bi-$K$-invariant, then our mass function boils down to the constant $\int _{G/K}u_{0}$ in the case $p=1$, and more generally to $\mathcal{H}{u_{0}}(i\rho (2/p-1))$ if $1\leq p<2$, and to $\mathcal{H}{u_{0}}(0)$ if $2\leq p \leq \infty $. Thus, we improve upon results by Vázquez, Anker et al., and Naik et al., clarifying the nature of the problem.}}, author = {{Papageorgiou, Effie}}, issn = {{1073-7928}}, journal = {{International Mathematics Research Notices}}, number = {{7}}, publisher = {{Oxford University Press (OUP)}}, title = {{{L p Asymptotics for the Heat Equation on Symmetric Spaces for Non-symmetric Solutions}}}, doi = {{10.1093/imrn/rnaf074}}, volume = {{2025}}, year = {{2025}}, } @phdthesis{63511, abstract = {{Der unsystematische und ineffiziente Umgang mit technischen Änderungen führt zuhohen Personalkosten durch Mehraufwand, einer reduzierten Entscheidungsqualität und kannin Projektfehlschlägen resultieren. Herausforderungen beim Umgang mit technischen Änderungenliegen in der Berücksichtigung relevanter Ursache-Wirkungs-Zusammenhänge, der quantitativen und qualitativen Bewertung der Auswirkungen und der effizienten prozessualen Einbindung. Mithilfe eines modellbasierten Lösungsansatzes lassen sich die Auswirkungen technischer Änderungen schneller bewerten und fundierte Entwicklungsentscheidungen treffen. In der vorliegenden Dissertation wird eine Methodik für die Entwicklung modell-basierter Wirkkettenanalysen zur Bewertung technischer Änderungen beschrieben. Durch die modellbasierte Wirkkettenanalyse können direkt oder indirekt von der Änderung betroffene Modellelemente identifiziert werden. Das Datenmodell wird mithilfe von Abfragesprachen analysiert und die Auswirkungen werden mithilfe von integrierten Metriken quantifiziert. Die Ergebnisse der Wirkkettenanalyse werden in rollenspezifischen Sichten bereitgestellt, wodurch eine bedarfsgerechte Entscheidungsunterstützung gewährleistet wird. Die Validierung anhand von vier industriellen Fallstudien belegt die Praxistauglichkeit der Methodik. Die Methodik verbindet das Änderungsmanagement mit den Vorteilen einer modellbasierten Systementwicklung und bildet somit einen synergetischen neuen Forschungsbereich.}}, author = {{Wiechel, Dominik}}, isbn = {{978-3-947647-51-4}}, issn = {{2365-4422}}, title = {{{Modellbasierte Wirkkettenanalyse zur Bewertung technischer Änderungen}}}, doi = {{10.17619/UNIPB/1-2473}}, volume = {{432}}, year = {{2025}}, } @techreport{63026, author = {{Althaus, Maike and Beverungen, Daniel and Flath, Beate and Halimeh, Haya and Hansmeier, Philipp and zur Heiden, Philipp and Kundisch, Dennis and Müller, Michelle and Müller, Oliver and Oberthür, Simon and Vorbohle, Christian and Momen Pour Tafreshi, Maryam and Mauß, Sebastian and Mücke, Alina and Müller, Jörg and Peter, Malte and Schmitt-Chandon, Ariane and Sellerberg, Kerstin and Steinhäuser, Moritz}}, title = {{{Positionspapier Use Case 1: Vernetzte Kulturplattformen}}}, year = {{2025}}, } @article{62652, abstract = {{Driven by the urgent need for a green, safe, and cost‐effective approach to producing H2 and H2O2—both highly valuable in green energy and environmental protection fields—piezocatalysis, which converts mechanical energy into valuable chemicals, has emerged as a promising solution. However, current catalyst systems face challenges due to the need for materials with both a strong piezoelectric effect and favorable catalytic activity. Herein, the construction of an oxidized carbon nitride (g‐C3N4) matrix anchored with TiO2 nanoparticles via alkaline hydrothermal treatment is reported. Under ultrasonication, the g‐C3N4/TiO2 composite exhibits optimal performance under carefully controlled alkaline hydrothermal conditions. With a low concentration of Ba(OH)2 during hydrothermal treatment, Ba(OH)2 provides an alkaline medium, oxidizing the g‐C3N4 species and introducing structural defects into the g‐C3N4 framework. The disruption of the g‐C3N4 matrix, along with its interaction with TiO2 nanoparticles, enhances the piezoelectric effect. Consequently, the oxidized g‐C3N4/TiO2 composite achieves a remarkable H2 production rate of 4427.2 μmol g−1 and an H2O2 production rate of 809.3 μmol g−1 within 1 h without the addition of any sacrificial agents or cocatalysts. This work presents an effective strategy for the structural optimization of g‐C3N4‐based materials and may inspire new approaches for designing advanced piezocatalysts.}}, author = {{Pan, Ying and Liao, Luocheng and Zhang, Xinwen and Liu, Yunya and Su, Ran and Lopez Salas, Nieves}}, issn = {{1864-5631}}, journal = {{ChemSusChem}}, number = {{19}}, publisher = {{Wiley}}, title = {{{Oxidation‐Enhanced Piezocatalytic Activity in Carbon Nitride‐Based Catalysts for Hydrogen and Hydrogen Peroxide Production}}}, doi = {{10.1002/cssc.202500980}}, volume = {{18}}, year = {{2025}}, } @article{62651, abstract = {{ Aqueous zinc (Zn)‐ion capacitors (AZICs) have addressed considerable attention due to their high energy density, low toxicity, and rich abundance of Zn metal. However, the development of ultra‐long cycle life and high energy density AZICs is often hindered by the lack of adequately optimized active carbon (AC) electrodes and compatible electrolytes. Herein, high‐performance, free‐standing AC electrodes for AZICs are derived from sustainable precursors—adenine and D‐ribose—using magnesium chloride hexahydrate as an activation agent via a eutectic template strategy. Furthermore, an aqueous hybrid electrolyte tailored to the designed AC electrodes is developed, significantly enhancing the stability and cycle life of AZICs. The resulting AZIC achieves a high specific capacity of 164.39 F g −1 at 0.1 A g −1 and a magnificently long cell life of over 50 000 cycles with nearly 94.5% capacitance retention at 10 000 th cycles, and 76.3% at 50 000 th cycle. The pouch cell assembly also demonstrates comparable specific capacitance and energy density to the coin cell, underscoring the potential of large‐scale applications of AZICs. }}, author = {{Tao, Li and Li, Chun and Lu, Xuejun and Mir, Rameez Ahmad and Lopez Salas, Nieves and Liu, Jian}}, issn = {{2566-6223}}, journal = {{Batteries & Supercaps}}, number = {{11}}, publisher = {{Wiley}}, title = {{{Adenine and D‐Ribose Coderived Activated Carbon with N‐Methyl‐2‐Pyrrolidone‐Modified Aqueous Electrolyte for Long‐Life Zinc‐Ion Capacitors}}}, doi = {{10.1002/batt.202500161}}, volume = {{8}}, year = {{2025}}, } @article{53412, abstract = {{Let $M$ be a symplectic manifold carrying a Hamiltonian $S^1$-action with momentum map $J:M \rightarrow \mathbb{R}$ and consider the corresponding symplectic quotient $\mathcal{M}_0:=J^{-1}(0)/S^1$. We extend Sjamaar's complex of differential forms on $\mathcal{M}_0$, whose cohomology is isomorphic to the singular cohomology $H(\mathcal{M}_0;\mathbb{R})$ of $\mathcal{M}_0$ with real coefficients, to a complex of differential forms on $\mathcal{M}_0$ associated with a partial desingularization $\widetilde{\mathcal{M}}_0$, which we call resolution differential forms. The cohomology of that complex turns out to be isomorphic to the de Rham cohomology $H(\widetilde{ \mathcal{M}}_0)$ of $\widetilde{\mathcal{M}}_0$. Based on this, we derive a long exact sequence involving both $H(\mathcal{M}_0;\mathbb{R})$ and $H(\widetilde{ \mathcal{M}}_0)$ and give conditions for its splitting. We then define a Kirwan map $\mathcal{K}:H_{S^1}(M) \rightarrow H(\widetilde{\mathcal{M}}_0)$ from the equivariant cohomology $H_{S^1}(M)$ of $M$ to $H(\widetilde{\mathcal{M}}_0)$ and show that its image contains the image of $H(\mathcal{M}_0;\mathbb{R})$ in $H(\widetilde{\mathcal{M}}_0)$ under the natural inclusion. Combining both results in the case that all fixed point components of $M$ have vanishing odd cohomology we obtain a surjection $\check \kappa:H^\textrm{ev}_{S^1}(M) \rightarrow H^\textrm{ev}(\mathcal{M}_0;\mathbb{R})$ in even degrees, while already simple examples show that a similar surjection in odd degrees does not exist in general. As an interesting class of examples we study abelian polygon spaces.}}, author = {{Delarue, Benjamin and Ramacher, Pablo and Schmitt, Maximilian}}, journal = {{Transformation Groups}}, title = {{{Singular cohomology of symplectic quotients by circle actions and Kirwan surjectivity}}}, doi = {{10.1007/s00031-025-09924-0}}, year = {{2025}}, } @unpublished{63569, abstract = {{Let $G$ be a totally disconnected locally compact (tdlc) group. The contraction group $\mathrm{con}(g)$ of an element $g\in G$ is the set of all $h\in G$ such that $g^n h g^{-n} \to 1_G$ as $n \to \infty$. The nub of $g$ can then be characterized as the intersection $\mathrm{nub}(g)$ of the closures of $\mathrm{con}(g)$ and $\mathrm{con}(g^{-1})$. Contraction groups and nubs provide important tools in the study of the structure of tdlc groups, as already evidenced in the work of G. Willis. It is known that $\mathrm{nub}(g) = \{1\}$ if and only if $\mathrm{con}(g)$ is closed. In general, contraction groups are not closed and computing the nub is typically a challenging problem. Maximal Kac-Moody groups over finite fields form a prominent family of non-discrete compactly generated simple tdlc groups. In this paper we give a complete description of the nub of any element in these groups.}}, author = {{Bischof, Sebastian and Marquis, Timothée}}, title = {{{Describing the nub in maximal Kac-Moody groups}}}, year = {{2025}}, } @inbook{60545, author = {{Kraft, Kerstin}}, booktitle = {{Erzählte Mode. Transdisziplinäre Perspektiven auf Text- und Bildgewebe}}, editor = {{Schäfer, Iris and Karentzos, Alexandra and Wernli, Martina}}, isbn = {{978-3-8376-7395-1}}, pages = {{19--38}}, publisher = {{transcript Verlag}}, title = {{{Sich in Worte kleiden. Über das Verhältnis von Texten und Textilien}}}, doi = {{10.14361/9783839473955-003}}, year = {{2025}}, } @inbook{65032, abstract = {{Despite its status as a key enabling technology, the adoption of 5G in industry remains limited, mainly due to a lack of expertise, which can be addressed by incorporating 5G training into vocational schools. Since Augmented Reality (AR) faces similar challenges, it is used as the 5G application. This research aims to determine the extent to which a learning unit using 5G and AR for collaborative work can increase the intention to use these technologies in the vocational setting and gathers the factors that make up 5G acceptance. It is based on the Technology Acceptance Model 2 (TAM2). The sample includes 23 industrial mechanics students who participated in the developed learning unit. All items are scored on seven-tiered Likert scales (0 “totally disagree”; 6 “totally agree”). The results showed a non-significant change in behavioural intention to use 5G, with a mean of 4.95 (SD: 1.18) for the pre-test and 4.43 (SD: 1.68) for the posttest. The change in intention to use AR did not change significantly either, from 3.12 (SD: 1.38) at pre-test to 3.37 (SD: 1.16) at post-test. The factors Perceived Usefulness, Image, and Relevance had the lowest mean scores, indicating areas for targeted improvement. The significant change in Output Quality ratings is likely to reflect initial overestimation by students. The difference in Behavioural Intentions between 5G and AR suggests that AR may not be an effective technology for increasing 5G adoption in educational contexts. One recommendation is to address 5G in the learning unit not only indirectly.}}, author = {{Schäfers, Johannes and Temmen, Katrin}}, booktitle = {{Proceedings of the 27th International Conference on Interactive Collaborative Learning (ICL2024), Volume 4}}, editor = {{Auer, Michael E. and Rüütmann, Tiia}}, isbn = {{9783031835193}}, issn = {{2367-3370}}, keywords = {{5G, Key Technology, TAM · Augmented Reality, VET}}, location = {{Tallinn}}, pages = {{84 – 91}}, publisher = {{Springer Nature Switzerland}}, title = {{{The Influence of an Immersive-Collaborative Learning Unit on the Technology Acceptance of 5G and AR of Industrial Mechanic Students}}}, doi = {{10.1007/978-3-031-83520-9_8}}, volume = {{1281}}, year = {{2025}}, } @inproceedings{65006, author = {{Knaup, Felix and Brüning, Florian and Schöppner, Volker}}, booktitle = {{Technomer 2025 29. Fachtagung}}, isbn = {{978-3-939382-17-1}}, keywords = {{Aufschmelzen, Aufschmelzmodellierung, Feststoffbett, melting modeling}}, title = {{{Bestimmung der Feststoffbettfestigkeit zur Vorhersage von Feststoffbettbrüchen im Einschneckenextruder}}}, year = {{2025}}, } @inproceedings{65048, author = {{Salm, Maximilian Karl Franz and Moritzer, Elmar}}, booktitle = {{Technomer 2025 29. Fachtagung}}, isbn = {{978-3-939382-17-1}}, keywords = {{Additive Fertigung, Elektrische Leitfähigkeit, Compounds, TPE, Fused Filament Fabrication}}, title = {{{Einfluss von FFF-Prozessparametern auf die elektrische Leitfähigkeit von leitfähigen TPE-Komposite}}}, year = {{2025}}, } @inproceedings{65047, author = {{Beutelspacher, Jonas and Scharwald, David and Moritzer, Elmar}}, booktitle = {{Technomer 2025 29. Fachtagung}}, isbn = {{978-3-939382-17-1}}, title = {{{Einfluss der Schichtstruktur auf die Druckfestigkeit von FDM-Bauteilen – Ein konzeptioneller Ansatz}}}, year = {{2025}}, } @article{65057, author = {{Lobner, Laura and Meyer-Hamme, Johannes and Schönhärl, Korinna}}, journal = {{Geschichte in Wissenschaft und Unterricht}}, number = {{76, H. 9/10}}, pages = {{555--571}}, title = {{{Drei Spielfilme über die Wannseekonferenz als Anlass historischen Lernens}}}, year = {{2025}}, } @book{65062, author = {{Tröster, Thomas and Marten, Thorsten and Luig, Simon}}, isbn = {{978-3-96780-214-6}}, publisher = {{Forschungsvereinigung Stahlanwendung e.V. (FOSTA)}}, title = {{{Methodische Auswahl hochfester Mehrphasenstähle bezüglich ihrer lokalen und globalen Duktilität}}}, volume = {{P 1447}}, year = {{2025}}, } @inbook{65079, abstract = {{(peer-review) first published as: „Kanon und Klassiker“, in: Handbuch Philosophie und Ethik, Bd. 1 Didaktik und Methodik, hrsg. von Julian Nida-Rümelin, Irina Spiegel, Markus Tiedemann, Paderborn, 2015, S. 252-260. translated by Fredy Hernán Prieto Galindo}}, author = {{Albus, Vanessa}}, booktitle = {{Revista de Educación & Pensamiento. Nr. 32}}, pages = {{50--59}}, publisher = {{Colegiohispanoamericano}}, title = {{{El Canon Filosófico y los Autores Clásicos}}}, doi = {{http://educacionypensamiento.colegiohispano.edu.co/index.php/revistaeyp/oai https://educacionypensamiento.colegiohispano.edu.co/index.php/revistaeyp/article/view/186/170}}, year = {{2025}}, } @techreport{62981, abstract = {{Otus is a high-performance computing cluster that was launched in 2025 and is operated by the Paderborn Center for Parallel Computing (PC2) at Paderborn University in Germany. The system is part of the National High Performance Computing (NHR) initiative. Otus complements the previous supercomputer Noctua 2, offering approximately twice the computing power while retaining the three node types that were characteristic of Noctua 2: 1) CPU compute nodes with different memory capacities, 2) high-end GPU nodes, and 3) HPC-grade FPGA nodes. On the Top500 list, which ranks the 500 most powerful supercomputers in the world, Otus is in position 164 with the CPU partition and in position 255 with the GPU partition (June 2025). On the Green500 list, ranking the 500 most energy-efficient supercomputers in the world, Otus is in position 5 with the GPU partition (June 2025). This article provides a comprehensive overview of the system in terms of its hardware, software, system integration, and its overall integration into the data center building to ensure energy-efficient operation. The article aims to provide unique insights for scientists using the system and for other centers operating HPC clusters. The article will be continuously updated to reflect the latest system setup and measurements. }}, author = {{Ehtesabi, Sadaf and Hossain, Manoar and Kenter, Tobias and Krawinkel, Andreas and Ostermann, Lukas and Plessl, Christian and Riebler, Heinrich and Rohde, Stefan and Schade, Robert and Schwarz, Michael and Simon, Jens and Winnwa, Nils and Wiens, Alex and Wu, Xin}}, keywords = {{Otus, Supercomputer, FPGA, PC2, Paderborn Center for Parallel Computing, Noctua 2, HPC}}, pages = {{33}}, publisher = {{Paderborn Center for Parallel Computing (PC2)}}, title = {{{Otus Supercomputer}}}, doi = {{10.48550/ARXIV.2512.07401}}, volume = {{1}}, year = {{2025}}, } @book{61118, abstract = {{Im Zuge der Digitalisierung erfahren maschinelles Lernen und datengetriebene Methoden derzeit eine große Aufmerksamkeit in Wissenschaft und Industrie. Es fehlt jedoch an Grundlagenwissen und Verständnis, wie die datengetriebenen Methoden der Informatik mit bewährten modellbasierten Ingenieursmethoden wie dem modellbasierten Entwurf in der Mechatronik und Methoden der Regelungstechnik sinnvoll kombiniert werden können, um hybride Modelle zu erhalten. Diese ingenieurwissenschaftlichen Methoden basieren auf physikalischen Verhaltensmodellen, die eine besonders verdichtete und interpretierbare Darstellung von Wissen darstellen und insbesondere kausale Zusammenhänge beschreiben. Für spezifische regelungstechnische Anwendungen gibt es umfangreiches Vorwissen in Form von bekannten Strukturen und Informationen, wie z.B. (Teil-)Modelle oder Parametersätze, die auch bei der Anwendung von Methoden wie dem maschinellen Lernen genutzt werden sollten. Eine solche sinnvolle systematische Verknüpfung ist wissenschaftlich, insbesondere im Hinblick auf die industrielle Anwendung, noch nicht ausreichend untersucht worden und sehr vielversprechend. In diesem Beitrag werden die Ergebnisse der Nachwuchsforschungsgruppe DART – Datengetriebene Methoden in der Regelungstechnik vorgestellt. Das Hauptziel war es, die synergetische Kombination von modell- und datengetriebenen Methoden für regelungstechnische Aufgaben zu erforschen und es werden alle wichtigen Forschungsergebnisse aber auch die verwendeten Grundprinzipien des maschinellen Lernens in diesem Beitrag dargestellt.}}, author = {{Timmermann, Julia and Götte, Ricarda-Samantha and Junker, Annika and Hesse, Michael and Schwarzer, Luis}}, publisher = {{HNI Verlagsschriftenreihe}}, title = {{{DART - Datengetriebene Methoden in der Regelungstechnik}}}, doi = {{10.17619/UNIPB/1-2305}}, volume = {{Band 430}}, year = {{2025}}, }