@unpublished{60432,
  abstract     = {{The Quantum k-SAT problem is the quantum generalization of the k-SAT problem.
It is the problem whether a given local Hamiltonian is frustration-free.
Frustration-free means that the ground state of the k-local Hamiltonian
minimizes the energy of every local interaction term simultaneously. This is a
central question in quantum physics and a canonical QMA_1-complete problem. The
Quantum k-SAT problem is not as well studied as the classical k-SAT problem in
terms of special tractable cases, approximation algorithms and parameterized
complexity. In this paper, we will give a graph-theoretic study of the Quantum
k-SAT problem with the structures core and radius. These hypergraph structures
are important to solve the Quantum k-SAT problem. We can solve a Quantum k-SAT
instance in polynomial time if the derived hypergraph has a core of size n-m+a,
where a is a constant, and the radius is at most logarithmic. If it exists, we
can find a core of size n-m+a with the best possible radius in polynomial time,
whereas finding a general minimum core with minimal radius is NP-hard.}},
  author       = {{Kremer, Simon-Luca and Rudolph, Dorian and Gharibian, Sevag}},
  booktitle    = {{arXiv:2506.17066}},
  title        = {{{Quantum k-SAT Related Hypergraph Problems}}},
  year         = {{2025}},
}

@inproceedings{60290,
  abstract     = {{The constantly increasing demand for climate protection and resource conservation requires innovative and versatile joining processes that improve adaptability to the joining task and robustness to enable flexible manufacturing on a production line. Therefore, the versatile SPR (V-SPR) and tumbling SPR (T-SPR) were developed. Using the example of a mixed material combination HCT590X+Z (t0 = 1.0 mm) / EN AW-6014 T4 (t0 = 2.0 mm), these processes were examined and compared with regard to the binding mechanisms form closure and force closure using micrographs, non-destructive resistance measurements and destructive torsion tests. For this purpose, a new sample geometry was defined, and the methods were adapted to the SPR process variants.</jats:p>}},
  author       = {{Lüder, Stephan and Holtkamp, Pia Katharina and Wituschek, Simon and Bobbert, Mathias and Meschut, Gerson and Lechner, Michael and Schmale, Hans Christian}},
  booktitle    = {{Materials Research Proceedings}},
  editor       = {{Meschut, Gerson and Bobbert, Mathias and Duflou, Joost and Fratini, Livan and Hagenah, Hinnerk and Martins, Paulo A. F. and Merklein, Marion and Micari, Fabrizio}},
  issn         = {{2474-395X}},
  keywords     = {{Joining, Self-Piercing Riveting, Sheet Metal}},
  location     = {{Paderborn}},
  pages        = {{101 -- 108}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{Analysis of the binding mechanisms depending on versatile process variants of self-piercing riveting}}},
  doi          = {{10.21741/9781644903551-13}},
  volume       = {{52}},
  year         = {{2025}},
}

@article{60441,
  abstract     = {{Conventional mechanical joining processes are typically rigid in their tool systems and can only react to changing process and disturbance variables to a limited extent. At the same time, various industries are increasingly trending towards multi-material systems consisting of parts with varying geometric and mechanical properties. Due to the varying properties, rigid mechanical joining processes require sampling procedures and periodic changes of tool components or auxiliary joining parts. Consequently, research is focusing on versatile mechanical joining processes that allow increased control by modifying the process parameters. Two processes based on self-piercing riveting can achieve a significant increase in process influence possibilities through a multi-linear actuator as versatile self-piercing riveting (V-SPR) and a tumbling superimposed actuator as tumbling self-piercing riveting (T-SPR). Initial research into V-SPR has shown that this process can be used to achieve a higher variation in overall package thickness by adapting the rivet geometry and using multiple linear actuators. The T-SPR process also enables increased material flow control by means of targeted compression of the rivet using the tumbling actuator, thereby extending the range of joints that can be manufactured. Based on these two processes, a combination of the two mechanisms of action is to be developed.}},
  author       = {{Holtkamp, Pia Katharina and Wituschek, Simon and Lechner, Michael and Meschut, Gerson}},
  issn         = {{2261-236X}},
  journal      = {{MATEC Web of Conferences}},
  publisher    = {{EDP Sciences}},
  title        = {{{Integration of multiple-linear and tumbling kinematics into self-piercing riveting}}},
  doi          = {{10.1051/matecconf/202540801069}},
  volume       = {{408}},
  year         = {{2025}},
}

@inproceedings{60439,
  abstract     = {{Abstract. Mechanical joints are traditionally analyzed through destructive micrograph analysis, which may compromise internal geometry and morphology, as evidenced by radial cracks in semi-tubular self-pierce riveting. In contrast, industrial X-ray computed tomography (XCT) offers a non-destructive method for component diagnosis, providing volumetric insights without damaging the sample and enabling dimensional measurement. The DFG-funded Collaborative Research Center TRR 285 is exploring XCT's application in assessing mechanical joinability across various joining processes and materials, particularly in multi-material systems like steel-aluminum joints. XCT faces challenges in accurately capturing multi-material compositions, leading to artifacts that complicate interface detection. This research aims to validate XCT for joint investigations, yielding quantitative characteristics that surpass those from traditional micrograph analysis.}},
  author       = {{Lechner, M. and Borgert, Thomas and Busch, Matthias and Harms, A. and Holtkamp, Pia Katharina and Römisch, D. and Wituschek, Simon and Kappe, Fabian}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{Non-destructive testing in versatile joining processes}}},
  doi          = {{10.21741/9781644903551-12}},
  volume       = {{52}},
  year         = {{2025}},
}

@misc{60228,
  abstract     = {{Die Arbeiten Paula Modersohn-Beckers sind von weltweiter Berühmtheit. Ihr Werk besticht durch Direktheit und Singularität ihres künstlerischen Ausdrucks. Heute gilt sie als zentrale Wegbereiterin moderner Strömungen in Deutschland. 1 An ihrer künstlerischen Genese zu einer der bedeutendsten Vertreterinnen des frühen Expressionismus ist ein Westfale, der Bildhauer Bernhard Hoetger, nicht unbeteiligt, der ihr zu wichtigen Zeitpunkten ihres kurzen Lebens ein Wegbegleiter war und der sie in das Bürener Land führte. Jene damals von Paula Modersohn-Becker beschrittenen Wege können noch heute verfolgt werden. So zeichnen seit 1998 Schilder und Erläuterungstafeln den Weg am Fluss Alme aus. Vorher sollte es Hoetger und Modersohn-Becker aber in die Kunstkapitale um 1900 führen, nach Paris.}},
  author       = {{Schreckenberg, Carolin}},
  publisher    = {{LibreCat University}},
  title        = {{{Die künstlerische Moderne zu Besuch in Büren. Ein Blick auf die Beziehung von Paula Modersohn-Becker zum westfälischen Künstler Bernhard Hoetger}}},
  doi          = {{10.58079/143CB}},
  year         = {{2025}},
}

@article{53805,
  abstract     = {{The article introduces a method to learn dynamical systems that are governed by Euler–Lagrange equations from data. The method is based on Gaussian process regression and identifies continuous or discrete Lagrangians and is, therefore, structure preserving by design. A rigorous proof of convergence as the distance between observation data points converges to zero and lower bounds for convergence rates are provided. Next to convergence guarantees, the method allows for quantification of model uncertainty, which can provide a basis of adaptive sampling techniques. We provide efficient uncertainty quantification of any observable that is linear in the Lagrangian, including of Hamiltonian functions (energy) and symplectic structures, which is of interest in the context of system identification. The article overcomes major practical and theoretical difficulties related to the ill-posedness of the identification task of (discrete) Lagrangians through a careful design of geometric regularisation strategies and through an exploit of a relation to convex minimisation problems in reproducing kernel Hilbert spaces.}},
  author       = {{Offen, Christian}},
  journal      = {{Mathematics of Computation}},
  publisher    = {{American Mathematical Society}},
  title        = {{{Machine learning of continuous and discrete variational ODEs with convergence guarantee and uncertainty quantification}}},
  doi          = {{10.1090/mcom/4120}},
  year         = {{2025}},
}

@article{60298,
  abstract     = {{In this work, we introduce PHOENIX, a highly optimized explicit open-source solver for two-dimensional nonlinear Schrödinger equations with extensions. The nonlinear Schrödinger equation and its extensions (Gross-Pitaevskii equation) are widely studied to model and analyze complex phenomena in fields such as optics, condensed matter physics, fluid dynamics, and plasma physics. It serves as a powerful tool for understanding nonlinear wave dynamics, soliton formation, and the interplay between nonlinearity, dispersion, and diffraction. By extending the nonlinear Schrödinger equation, various physical effects such as non-Hermiticity, spin-orbit interaction, and quantum optical aspects can be incorporated. PHOENIX is designed to accommodate a wide range of applications by a straightforward extendability without the need for user knowledge of computing architectures or performance optimization. The high performance and power efficiency of PHOENIX are demonstrated on a wide range of entry-class to high-end consumer and high-performance computing GPUs and CPUs. Compared to a more conventional MATLAB implementation, a speedup of up to three orders of magnitude and energy savings of up to 99.8% are achieved. The performance is compared to a performance model showing that PHOENIX performs close to the relevant performance bounds in many situations. The possibilities of PHOENIX are demonstrated with a range of practical examples from the realm of nonlinear (quantum) photonics in planar microresonators with active media including exciton-polariton condensates. Examples range from solutions on very large grids, the use of local optimization algorithms, to Monte Carlo ensemble evolutions with quantum noise enabling the tomography of the system's quantum state.}},
  author       = {{Wingenbach, Jan and Bauch, David and Ma, Xuekai and Schade, Robert and Plessl, Christian and Schumacher, Stefan}},
  issn         = {{0010-4655}},
  journal      = {{Computer Physics Communications}},
  publisher    = {{Elsevier BV}},
  title        = {{{PHOENIX – Paderborn highly optimized and energy efficient solver for two-dimensional nonlinear Schrödinger equations with integrated extensions}}},
  doi          = {{10.1016/j.cpc.2025.109689}},
  volume       = {{315}},
  year         = {{2025}},
}

@phdthesis{60469,
  abstract     = {{Wissensmanagement ist im unternehmerischen Kontext ein etabliertes Feld der Forschung und Praxis, das auf die Verbesserung von Effizienz und Wettbewerbsfähigkeit abzielt. In den Organisationen der zivilen Gefahrenabwehr hingegen gibt es erhebliche Defizite bei der Erfassung und Weitergabe von Wissen, obwohl auch hier große Abhängigkeiten vom Erfahrungswissen bestehen. Diese Arbeit analysiert am Beispiel der Feuerwehr die Gründe für diese Diskrepanz und entwickelt ein Konzept, das das Wissensmanagement im Feuerwehrwesen nachhaltig verankern soll. Eine deutschlandweite Umfrage mit 577 Einsatzkräften ergab, dass eine digitale Verwaltungsunterstützung bereits verbreitet ist, das Wissen jedoch vornehmlich per E-Mail, Chat, mündlich oder per Aushang verteilt wird. Die Teilnehmenden wünschen sich eine Lösung für das Wissensmanagement, die im Einsatz, bei Aus- und Weiterbildung sowie der Verwaltungsarbeit unterstützt. Auf der Umfrage und einer systematischen Literaturrecherche aufbauend, wurde der Handlungsbedarf identifiziert. Darauf basieren die Ableitung der Anwendungsbereiche sowie Rahmenbedingungen, welche sich in den Anforderungen an ein Wissensmanagementsystem widerspiegeln. Das Umsetzungskonzept beschreibt die Systemarchitektur der Lösung, die auf einem open-source Wiki mit passenden Erweiterungen beruht. Zentrales Element ist die Möglichkeit zum Austausch von Wissen über Organisationsgrenzen. Abgeschlossen wird die Arbeit mit der Demonstration und Evaluation der Lösung.}},
  author       = {{Schultz, Andreas Maximilian}},
  publisher    = {{LibreCat University}},
  title        = {{{Konzeptionierung eines digitalen Wissensmanagementsystems für die zivile Gefahrenabwehr am Beispiel der Feuerwehr}}},
  doi          = {{10.17619/UNIPB/1-2315}},
  year         = {{2025}},
}

@article{60471,
  author       = {{Knoll-Pientka, N and Schils, D and Pasternak, K and Czarnetzky, S and Jansen, C and Gradl-Dietsch, G and Seitz, J and Skoda, EM and Libuda, Lars and Schweda, A and Teufel, M}},
  issn         = {{2050-2974}},
  journal      = {{J Eat Disord}},
  number       = {{1}},
  pages        = {{87}},
  title        = {{{Can bioelectrical impedance analysis be used to identify water loading in patients with anorexia nervosa?- Implications from experimental measurements in young, healthy, and normal weight women.}}},
  volume       = {{13}},
  year         = {{2025}},
}

@unpublished{60474,
  author       = {{Januszewski, Fabian}},
  booktitle    = {{arXiv:2506.23251}},
  pages        = {{38}},
  title        = {{{Rational structures on quivers and a generalization of Gelfand's equivalence}}},
  year         = {{2025}},
}

@article{60496,
  abstract     = {{<jats:p>Hypertree decompositions provide a way to evaluate Conjunctive Queries (CQs) in polynomial time, where the exponent of this polynomial is determined by the width of the decomposition. In theory, the goal of efficient CQ evaluation therefore has to be a minimisation of the width. However, in practical settings, it turns out that there are also other properties of a decomposition that influence the performance of query evaluation. It is therefore of interest to restrict the computation of decompositions by constraints and to guide this computation by preferences. To this end, we propose a novel framework based on candidate tree decompositions, which allows us to introduce soft hypertree width (shw). This width measure is a relaxation of hypertree width (hw); it is never greater than hw and, in some cases, shw may actually be lower than hw. Most importantly, shw preserves the tractability of deciding if a given CQ is below some fixed bound, while offering more algorithmic flexibility. In particular, it provides a natural way to incorporate preferences and constraints into the computation of decompositions. A prototype implementation and preliminary experiments confirm that this novel framework can indeed have a practical impact on query evaluation.</jats:p>}},
  author       = {{Lanzinger, Matthias and Okulmus, Cem and Pichler, Reinhard and Selzer, Alexander and Gottlob, Georg}},
  issn         = {{2836-6573}},
  journal      = {{Proceedings of the ACM on Management of Data}},
  location     = {{Berlin}},
  number       = {{2}},
  pages        = {{1--25}},
  publisher    = {{Association for Computing Machinery (ACM)}},
  title        = {{{Soft and Constrained Hypertree Width}}},
  doi          = {{10.1145/3725251}},
  volume       = {{3}},
  year         = {{2025}},
}

@inproceedings{60494,
  abstract     = {{Pillow-plate heat exchangers (PPHEs) represent a viable alternative to conventional shell-and-tube and plate heat exchangers. The waviness of their channels intensifies fluid mixing in the boundary layers and facilitates heat transfer. Applying secondary surface structuring can further enhance the overall thermo-hydraulic performance of PPHEs, thus increasing their competitiveness against conventional heat exchangers. In this work, streamlined secondary structures applied on the PPHE surface were studied numerically to explore their potential in enhancing near-wall fluid mixing. Computational fluid dynamics (CFD) simulations of single-phase turbulent flow in the inner PPHE channel were performed and pressure drop, heat transfer coefficients, and overall thermo-hydraulic efficiency were determined. The simulation results clearly demonstrate a favourable influence of secondary structuring on the heat transfer performance of PPHEs.</jats:p>}},
  author       = {{Afsahnoudeh, Reza and Riese, Julia and Kenig, Eugeny Y.}},
  booktitle    = {{Systems and Control Transactions}},
  issn         = {{2818-4734}},
  publisher    = {{PSE Press}},
  title        = {{{Thermo-Hydraulic Performance of Pillow-Plate Heat Exchangers with Streamlined Secondary Structures: A Numerical Analysis}}},
  doi          = {{10.69997/sct.178665}},
  volume       = {{4}},
  year         = {{2025}},
}

@inproceedings{60493,
  abstract     = {{Heat pumps play a crucial role in decarbonizing the chemical industry. The integration and sizing of heat pumps in chemical processes is a challenging task in multi-product chemical processes due to the fluctuating waste heat supply and heat demand. Integrating heat pumps may require a retrofit of the utility system. Mathematical optimization is a useful tool to tackle this challenge by enabling the analysis of correlation between relevant system parameters and equipment sizing. This study demonstrates the utilization of mathematical optimization and parameter studies for utility system equipment sizing addressing fluctuating heat supply and demand profiles.</jats:p>}},
  author       = {{Hochhaus, Thorben and Wloch, Johannes and Grünewald, Marcus and Riese, Julia}},
  booktitle    = {{Systems and Control Transactions}},
  issn         = {{2818-4734}},
  publisher    = {{PSE Press}},
  title        = {{{A Data-Driven Conceptual Approach to Heat Pump Sizing in Chemical Processes with Fluctuating Heat Supply and Demand}}},
  doi          = {{10.69997/sct.196662}},
  volume       = {{4}},
  year         = {{2025}},
}

@article{60495,
  author       = {{Podworny, Susanne and Fleischer, Yannik and Biehler, Rolf}},
  journal      = {{Stochastik in der Schule}},
  number       = {{2}},
  pages        = {{9--16}},
  title        = {{{Explorative Datenanalyse in der Schule – Analyse der Mediennutzung von Jugendlichen mit den YOU‑PB Daten}}},
  volume       = {{45}},
  year         = {{2025}},
}

@unpublished{60491,
  abstract     = {{We investigate generalisations of 1-factorisations and hyperfactorisations of the complete graph $K_{2n}$. We show that they are special subsets of the association scheme obtained from the Gelfand pair $(S_{2n},S_2 \wr S_n)$. This unifies and extends results by Cameron (1976) and gives rise to new existence and non-existence results. Our methods involve working in the group algebra $\mathbb{C}[S_{2n}]$ and using the representation theory of $S_{2n}$.}},
  author       = {{Klawuhn, Lukas-André Dominik and Bamberg, John}},
  title        = {{{On the association scheme of perfect matchings and their designs}}},
  year         = {{2025}},
}

@inproceedings{60497,
  abstract     = {{Despite the advantages that the virtual knowledge graph paradigm has brought to many application domains, state-of-the-art systems still do not support popular graph database management systems like Neo4j. Their query rewriting algorithms focus on languages like conjunctive queries and their unions, which were developed for relational data and are poorly suited for graph data. Moreover, they also limit the expressiveness of the ontology languages that admit rewritings, restricting them to those that enjoy the so-called FO-rewritability property. Rewritings have thus focused on the DL-Lite family of Description Logics. In this paper, we propose a technique for rewriting a family of navigational queries for a suitably tailored fragment of ELHI. Leveraging navigational features in the target query language, we can include some widely-used axiom shapes not supported by DL-Lite. We implemented a proof-of-concept prototype that rewrites into Cypher queries, and tested it on a real-world cognitive neuroscience use case with promising results.}},
  author       = {{Löhnert, Bianca and Augsten, Nikolaus and Okulmus, Cem and Ortiz, Magdalena}},
  booktitle    = {{The Semantic Web - 22nd European Semantic Web Conference, {ESWC} 2025, Portoroz, Slovenia, June 1-5, 2025, Proceedings, Part {I}}},
  isbn         = {{9783031945748}},
  issn         = {{0302-9743}},
  keywords     = {{Ontology-based Data Access, Property Graphs, Navigational Queries}},
  location     = {{Portorož, Slovenia}},
  pages        = {{342----361}},
  publisher    = {{Springer Nature Switzerland}},
  title        = {{{Towards Practicable Algorithms for Rewriting Graph Queries Beyond DL-Lite}}},
  doi          = {{10.1007/978-3-031-94575-5_19}},
  volume       = {{15718}},
  year         = {{2025}},
}

@inproceedings{60502,
  author       = {{Zeipert, Henning and Claes, Leander and Stoeckel, Chris and Mulay, Shubham and Henning, Bernd}},
  location     = {{Nürnberg}},
  title        = {{{Evaluation of piezoelectric micromachined ultrasonic transducers (PMUT) for the broadband detection of ultrasonic elastic waves}}},
  doi          = {{10.5162/SMSI2025/D5.2}},
  year         = {{2025}},
}

@article{59163,
  abstract     = {{While existing studies have extensively explored various facets of international students’ experiences, a gap remains in understanding the connection between their social capital accumulation and information-seeking practices that shape the incoming students’ extended transition process. Successful information-seeking is not solely related to academic outcome; it is also influenced by the social capital resources available within and beyond familiar cultural groups. This article sheds light on how international students’ social capital accumulation shapes their information searches across various online and offline social networks. A total of ten international students were interviewed at the beginning and the end of their first semester in Germany during the 2022–23 academic year. The findings demonstrate that the incoming students’ information-seeking strategies and social capital accumulation change over time. The students rely on their previously established social connections offline and online when preparing for their departure. Upon arrival in Germany, the students continue to search for information within their linguistic and cultural familiar groups, but their information-seeking process shifts to local in-person contexts. During the semester, lecturers and fellow students become useful information sources at the university while the students develop confidence in their foreign language skills.</jats:p>}},
  author       = {{Teichert, Jeannine and Lin-Januszewski, Liang-Wen}},
  issn         = {{2397-7140}},
  journal      = {{Transitions: Journal of Transient Migration}},
  publisher    = {{Intellect}},
  title        = {{{Linking social capital accumulation and information-seeking practices of international students in Germany}}},
  doi          = {{10.1386/tjtm_00071_1}},
  year         = {{2025}},
}

@inproceedings{60506,
  author       = {{Adler, Enno and Böttcher, Stefan and Hartel, Rita}},
  booktitle    = {{2025 Data Compression Conference (DCC)}},
  publisher    = {{IEEE}},
  title        = {{{String Partition for Building Long BWTs}}},
  doi          = {{10.1109/dcc62719.2025.00044}},
  year         = {{2025}},
}

@article{60507,
  abstract     = {{<jats:p>DNA origami nanostructures are powerful molecular tools for the controlled arrangement of functional molecules and thus have important applications in biomedicine, sensing, and materials science. The fabrication of DNA origami...</jats:p>}},
  author       = {{Tomm, Emilia and Grundmeier, Guido and Keller, Adrian}},
  issn         = {{2040-3364}},
  journal      = {{Nanoscale}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Cost-efficient folding of functionalized DNA origami nanostructures via staple recycling}}},
  doi          = {{10.1039/d5nr01435b}},
  year         = {{2025}},
}