@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{65491, abstract = {{Abstract The micropolar continuum is a special case of a micromorphic material model and has additional degrees of freedom in the form of microrotations compared to the classical continuum. With the micropolar model, size effects can be considered and the boundary value problem can be regularized when localization effects occur. In order to map the microrotations, an additional strain measure and an additional stress are introduced. For simulation of plasticity, it is possible to define one yield function, and thus one plastic multiplier as well as one equivalent plastic strain occur. This approach is known as the single-surface plasticity approach. The macro- and micro-stresses are coupled in a common flow function. On the other hand, there is the so-called double-surface plasticity when one yield function, one plastic multiplier, and one equivalent plastic strain, respectively, are introduced for each of the macro- and micro-variables. The coupling of the macro- and micro-variables is established by a possible coupling of both yield functions. The purpose of this paper is to compare both approaches and to identify similarities and differences.}}, author = {{Börger, Alexander and Mahnken, Rolf}}, issn = {{0939-1533}}, journal = {{Archive of Applied Mechanics}}, number = {{5}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Single-surface and double-surface plasticity for micropolar continuum}}}, doi = {{10.1007/s00419-026-03049-w}}, volume = {{96}}, year = {{2026}}, } @inbook{65497, author = {{Schmitt, Martin}}, booktitle = {{Rechnen, Zeichnen, Reden Zur Geschichte der Datenverarbeitung im langen 19. Jahrhundert}}, editor = {{Köhler, Volker}}, keywords = {{Umweltgeschichte, 19. Jahrhundert, Deutschland, Forstwirtschaft, Konrad Zuse, Datenverarbeitung, Umweltdaten}}, pages = {{35–64}}, publisher = {{Transcript}}, title = {{{Von Baumdaten zu Datenwäldern. Eine Umweltgeschichte der Informationsverarbeitung im Ausklang des langen 19. Jahrhunderts}}}, volume = {{14}}, year = {{2026}}, } @article{65495, abstract = {{This paper presents a holistic framework for the transition from diesel to electric bus networks, crucial for meeting EU regulations targeting 100% zero-emission urban buses by 2035. We employ a two-phase solution framework: in phase 1, we solve the Charging Location and Electric Vehicle Scheduling Problem to generate vehicle schedules that are feasible for electric operation; in phase 2, these schedules serve as input to a multi-period transition planning model that minimizes the total cost of ownership while determining fleet replacement and charging infrastructure deployment. Our experiments show that schedules obtained from solving the integrated charging location and vehicle scheduling problem significantly outperform traditional methods, resulting in lower total cost of ownership. Additionally, transition plans reduce local emissions by up to 85% compared to a diesel-only scenario. We find that vehicle rotations with long distances and sufficient idle time are prioritized for electrification, enabling earlier emission reductions and cost savings. This highlights the importance of adopting vehicle scheduling tailored for electric buses, rather than relying on legacy diesel schedules.}}, author = {{Stumpe, Miriam and Rößler-von Saß, David and Natalia, Kliewer and Schryen, Guido}}, journal = {{Transportation Research Interdisciplinary Perspectives}}, keywords = {{electric bus, multi-period planning, electric vehicle scheduling, charging infrastructure, fleet replacement}}, title = {{{Impact of Vehicle Scheduling and Strategic Transition Planning on Zero-Emission Bus Systems}}}, year = {{2026}}, } @book{63210, editor = {{Dockter, Cornelia and Lebock, Sarah and Wiesenhütter, Lukas}}, issn = {{2629-8848}}, location = {{Paderborn}}, publisher = {{Brill - Schöningh}}, title = {{{Religion and Health - Comparative-Theological Approaches}}}, volume = {{44}}, year = {{2026}}, } @inproceedings{61492, abstract = {{This paper deals with the development and results of a prediction framework for traffic light control systems as well as the usage and benefits of such predictions in green light optimal speed advisory (GLOSA) scenarios. Various machine learning methods like support vector machines, neural networks or reinforcement learning were evaluated for their applicability in the prediction context and compared based on their efficiency and most importantly accuracy. The resulting prediction framework uses decision tree ensemble models combined with certain model knowledge to forecast different control strategies. This method was chosen due to its best performance in various test scenarios. Very high accuracy and fidelity were achieved for standard control methods like fixed-time, time-of-day-based and 'ordinary' traffic-based programs. Only for the more sophisticated model predictive control which was tested lower accuracies were achieved. For the upcoming GLOSA application the penetration of equipped vehicles was varied for different traffic scenarios and control strategies. Results showcase high potentials for enhancing urban mobility and reducing environmental impact by lower emissions and waiting times. However, it is also clear from the studies presented in this contribution that the coordination of the control strategy with the GLOSA vehicles is of enormous importance.}}, author = {{Malena, Kevin and Link, Christopher and Gausemeier, Sandra and Trächtler, Ansgar}}, booktitle = {{2025 IEEE 28th International Conference on Intelligent Transportation Systems (ITSC)}}, keywords = {{ML, Prediction, Tree Ensembles, GLOSA}}, location = {{Gold Coast (Australia)}}, publisher = {{IEEE}}, title = {{{ML-based Prediction Framework for varying Traffic Signal Control Strategies and its GLOSA-application}}}, volume = {{28}}, year = {{2026}}, } @article{65506, abstract = {{ Purpose The adoption of laser powder bed fusion (LPBF) as an additive manufacturing technique has been slow in the oil and gas (O&G) industry because of the uncertainty regarding material performance and the lack of suitable materials. The high investment and time required for LPBF development also discourage adoption. This study aims to address these concerns by developing a parameter set for a relevant material using a systematic approach to optimize the density of the printed parts with reduced experimental effort. Design/methodology/approach First, an industry-relevant Ni-based superalloy, UNS N09946, was gas-atomized to produce a powder. The powder was fully characterized to ensure successful printing. Next, a processing parameter set tailored for achieving full density was developed for UNS N09946 using a Design of Experiments (DoE) approach based on the volumetric energy density equation. Findings A model was created using Response Surface Methodology that relates laser power, scan speed and hatch distance to efficiently identify successful parameter combinations, thus reducing the number of specimens necessary for the successful manufacturing of UNS N09946 using LPBF. A part density of 99.9% was achieved using this method. Originality/value This study applies an existing experimental design method to a never-before-printed material. The reduced experimental effort through this method and lessons learned from the gas atomization process can be directly applied to other materials in and outside the O&G industry to further the adoption of LPBF as a serious manufacturing technology. }}, author = {{Wooldridge, Madison and Holzweissig, Martin and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{1355-2546}}, journal = {{Rapid Prototyping Journal}}, pages = {{1--15}}, publisher = {{Emerald}}, title = {{{Response surface methodology for parameter development of alloy UNS N09946 processed with laser powder bed fusion}}}, doi = {{10.1108/rpj-01-2025-0039}}, year = {{2026}}, } @inbook{63211, author = {{Dockter, Cornelia and Lebock, Sarah and Wiesenhütter, Lukas }}, booktitle = {{Religion and Health - Comparative-theological Approaches}}, editor = {{Dockter, Cornelia and Lebock, Sarah and Wiesenhütter, Lukas}}, issn = {{2629-8848}}, pages = {{VII--XV}}, publisher = {{Brill - Schöningh}}, title = {{{Introduction}}}, volume = {{44}}, year = {{2026}}, } @inbook{58313, author = {{Mildorf, Jarmila}}, booktitle = {{Pandemic Storytelling}}, editor = {{Alber, Jan and de Muijnck, Deborah and Jumpertz, Jessica }}, isbn = {{978-90-04-51985-5 }}, pages = {{83--96}}, publisher = {{Brill}}, title = {{{Crisis and Creativity: Poetry in Times of Corona}}}, volume = {{3}}, year = {{2025}}, } @article{58378, abstract = {{Abstract The contact between two partners can be determined using experimental or numerical methods. For the validation of numerical simulations, appropriate experiments and material models of the contact partners are required. Paper in combination with carbon paper can be used in experiments to detect the area of contact between contact partners. A simplified linear-elastic material model of paper for compression in the thickness direction was developed. To evaluate the material model, it was applied to an exemplary wheel-rail contact situation.}}, author = {{Stratmann, Ina and Hoyer, Kay-Peter and Schindler, Christian}}, issn = {{0742-4787}}, journal = {{Journal of Tribology}}, pages = {{1--19}}, publisher = {{ASME International}}, title = {{{Developing a simplified linear-elastic material model for carbon paper applied in the rough rail-wheel contact}}}, doi = {{10.1115/1.4067696}}, year = {{2025}}, } @article{58438, abstract = {{This study presents a numerical approach using a 3D finite element model to quantify the remaining clamp load of a plastic nut joint after a specific time. The viscoelastic relaxation of a thermoplastic nut, which is predominantly screwed on a welding stud, is described by a material card using Prony Series. Prony Series are derived from experimental dynamical mechanical analysis with different moisture and fiber contents of the thermoplastic. Since plastic nuts usually do not have preformed threads, the increased temperatures and resulting stresses from the thread-forming process are considered in the simulation. An FE model is created and verified by substrate stress relaxation tests. Experimental clamp load measurements with miniature compression load cells verify the clamp load prediction and show a good agreement. The developed model is used to analyze the clamp load distribution within the threads and reveals an almost even distribution within the threads.}}, author = {{Wippermann, Jan and Meschut, Gerson}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Numerical modeling of clamp load relaxation of plastic nuts under varying moisture and fiber contents}}}, doi = {{10.1007/s40194-025-01928-4}}, year = {{2025}}, } @article{58444, author = {{Wippermann, Jan and Meschut, Gerson}}, journal = {{JOINING PLASTICS}}, title = {{{Entwicklung einer Methode für die Prognose des Anziehdrehmoments von Kunststoffmutte}}}, year = {{2025}}, } @article{58454, abstract = {{Powertrain concepts incorporating renewable energies are an essential element of the energy revolution and increasingly require efficient manufacturing processes for electronic systems. Particularly, the joining of structures to be thermally coupled, such as the battery modules and the thermal management system (TMS), poses new challenges in process design. Factors that limit the process include the increased density, viscosity, and abrasiveness of thermal pastes as well as the pressure sensitivity of battery modules. The research presented aims to systematically investigate the influences of joining parameters on flow behavior, the formation of air inclusions, and the occurring joining forces to understand and systematically optimize the joining process. Employing a test setup following the Closing-Hele-Shaw-Cell, the influence of specific process parameters on the joining process such as the joining speed, joining gap, application pattern, and temperature was investigated for a silicone- and a polyurethane-based thermally conductive paste. The results indicate a high dependency of both the ensuing joining forces and the flow behavior on the parameters investigated. These insights imply a potential systematic parameter optimization and the specific adaptation of the joining process to improve flow behavior and reduce compressive stresses. This can ensure lower component deformations and qualify the process for the employment of cell types with a higher power density, a reduced encapsulation, and lower stiffness while at the same time improving production rates.}}, author = {{Gilich, Julian and Teutenberg, Dominik and Meschut, Gerson and Gröger, B. and Wiebicke, F. and Koch, I. and Gude, M.}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Effects of various process parameters in the joining process on the squeeze flow of highly viscous thermal interface materials}}}, doi = {{10.1007/s40194-025-01929-3}}, year = {{2025}}, } @book{58456, abstract = {{Im Rahmen des BMBF-Forschungsvorhabens KORESIL wurden entlang einer beispielgebenden Prozesskette für hybride Leichtbaustrukturen notwendige Forschungs- und Entwicklungsschwerpunkte ermittelt. Insbesondere die Steigerung der Ressourceneffizienz und die Unterstützung des Menschen im Kontext zukünftiger Arbeitsumfelder standen dabei im Mittelpunkt der Arbeiten. Hierauf aufbauend konnten Handlungsempfehlungen für Wirtschaft, Wissenschaft und Politik abgeleitet werden. Das Projekt KORESIL ist eingebettet in das Projektnetzwerk des Forschungs- und Technologiezentrums für ressourceneffiziente Leichtbaustrukturen – FOREL. Dieses Zentrum wurde im Jahr 2013 als BMBF-Leuchtturmprojekt eingerichtet und ist eine offene, unabhängige Plattform zur Entwicklung von Hightech-Leichtbausystemlösungen in Multi-Material-Design für die Mobilität der Zukunft. Ziel der Plattform ist die Unterstützung von Entwicklungsprojekten, die Vernetzung der Leichtbauforschung innerhalb Deutschlands und die Zusammenführung verschiedener Förderinitiativen.}}, editor = {{Gude, Maik and Tekkaya, Erman and Zäh, Michael F. and Meschut, Gerson and Lieberwirth, Holger}}, publisher = {{Technische Universität Dresden}}, title = {{{Komplexität beherrschen, Kreisläufe schließen: Soziotechnische Systeme für ressourceneffiziente Leichtbaustrukturen ; Das interaktive Whitepaper}}}, doi = {{10.25368/2024.8}}, year = {{2025}}, } @article{58495, abstract = {{ To reduce CO2 emissions, the industry, particularly in the mobility sector, focuses on lightweight vehicles with multi-material structures. As thermal joining processes are reaching their limits, mechanical techniques such as self-piercing riveting are being used. One innovative solution is the versatile self-piercing riveting process (V-SPR), which combines different material combinations with a multi-range rivet. 1 The joining process is divided into the piercing process and the forming process of the rivet head to the respective sheet thickness. The rivet shaft requires sufficient strength to punch through the punch-sided sheet, and sufficient ductility of the rivet head is required to form onto the punch-sided sheet. To achieve a combination of these requirements, local inductive heat treatment strategies are used for the rivet. To ensure reproducible rivet hardening, a specialised device has been developed for precise rivet positioning in the induction coil and the subsequent quenching process. The heat treatment differs in terms of hardening times and temperatures. In addition, the heat treatment is combined with a subsequent tempering process. The study aims to determine the resulting hardness distributions and microstructures of the rivet and to investigate the influence of different heat treatment strategies on joint formation and load-bearing capacities. The results show that a graded hardening profile has a positive effect on the spreading behaviour of the rivet foot and the forming behaviour of the rivet head. Furthermore, the load-bearing behaviour of the joints is increased. }}, author = {{Holtkamp, Pia Katharina and Kappe, Fabian and Probst, Paula and Bobbert, Mathias and Meschut, Gerson}}, issn = {{1464-4207}}, journal = {{Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications}}, publisher = {{SAGE Publications}}, title = {{{Investigation of local heat treatment strategies for a multi-range capable rivet and the influence on joint formation and load-bearing capacity}}}, doi = {{10.1177/14644207241307508}}, year = {{2025}}, } @inproceedings{58498, author = {{Wehde, Janis}}, location = {{Mannheim}}, title = {{{Determinanten der politischen Involviertheit von Lehramtsstudierenden und damit verbundene Implikationen für die Lehrer*innenbildung}}}, year = {{2025}}, } @article{58510, abstract = {{Today’s ultrasonic transducers find broad application in diverse technology branches and most often cannot be replaced by other actuators. They are typically based on lead-containing piezoelectric ceramics. These should be replaced for environmental and health issues by lead-free alternatives. Multiple material alternatives are already known, but there is a lack of information about their technological readiness level. To fill this gap, a small series of prestressed longitudinally vibrating transducers was set up with a standard PZT material and two lead-free variants within this study. The entire process for building the transducers is documented: characteristics of individual ring ceramics, burn-in results, and free vibration and characteristics under load are shown. The main result is that the investigated lead-free materials are ready to use within ultrasonic bolted Langevin transducers (BLTs) for medium-power applications, when the geometrical setup of the transducer is adopted. Since lead-free ceramics need higher voltages to achieve the same power level, the driving electronics or the mechanical setup must be altered specifically for each material. Lower self-heating of the lead-free materials might be attractive for heat-sensitive processes.}}, author = {{Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}}, issn = {{2076-0825}}, journal = {{Actuators}}, number = {{2}}, publisher = {{MDPI AG}}, title = {{{Lead-Free Ceramics in Prestressed Ultrasonic Transducers}}}, doi = {{10.3390/act14020055}}, volume = {{14}}, year = {{2025}}, } @article{58193, abstract = {{Zinc tin oxide (ZTO) is investigated as a photoluminescent sensor for oxygen (O2); chemisorbed oxygen quenches the luminescence intensity. At the same time, ZTO is also studied as a resistive sensor; being an n‐type semiconductor, its electrical conductance decreases by adsorption of oxygen. Both phenomena can be exploited for quantitative O2 sensing. The respective sensor responses can be described by the same modified Stern‐Volmer model that distinguishes between accessible and non‐accessible luminescence centers or charge carriers, respectively. The impact of the temperature is studied in the range from room temperature up to 150 °C.}}, author = {{Kothe, Linda and Klippstein, Josefin and Kloß, Marvin and Wengenroth, Marc and Poeplau, Michael and Ester, Stephan and Tiemann, Michael}}, issn = {{1439-4235}}, journal = {{ChemPhysChem}}, pages = {{e202400984}}, publisher = {{Wiley}}, title = {{{Oxygen‐dependent Photoluminescence and Electrical Conductance of Zinc Tin Oxide (ZTO): A Modified Stern‐Volmer Description}}}, doi = {{10.1002/cphc.202400984}}, volume = {{26}}, year = {{2025}}, } @article{59416, abstract = {{Abstract The present study explored the role of first-year physics students’ sense of belonging to physics and how it relates to their learning progression in higher education-level physics. Conducted at Paderborn University, this study examined how students’ sense of belonging to physics influences their academic outcomes in an introductory experimental physics course. Additionally, we investigated how physics students’ engagement in the Physiktreff—a holistic support program for first-year physics students to help them cope with academic and social challenges during their studies—impacts the development of their sense of belonging to physics over time. Our findings indicated that students with a stronger sense of belonging to physics performed better academically. Moreover, students who actively participated in the support program experienced a positive shift in their sense of belonging to physics. However, our findings also revealed that physics students with a higher initial sense of belonging to physics tended to experience a decline in their sense of belonging to physics during their first semester. These results underscore the importance of fostering a sense of belonging to physics within higher education, particularly during the introductory phase of students’ studies.
}}, author = {{Feser, Markus Sebastian and Bauer, Anna Brigitte}}, issn = {{0143-0807}}, journal = {{European Journal of Physics}}, publisher = {{IOP Publishing}}, title = {{{From belonging to success: Evaluating the influence of sense of belonging to physics on first-year university students’ academic outcomes and the benefits of a holistic support program}}}, doi = {{10.1088/1361-6404/adca13}}, year = {{2025}}, } @inbook{59451, abstract = {{Stets haben menschliche Gemeinschaften versucht, dem nahenden, sichvollziehenden sowie geschehenen Tod zu begegnen und dabei kommunikativePraktiken ausgebildet, die für die Zwecke der Todes- und Trauerverarbeitung zumEinsatz kommen. Die Erfassung und Reflexion dieser Praktiken ist Thema diesesBeitrags, in dem die extremen kommunikativen Ränder des sprachlichen Erfassensvon Tod sowie des performativen Vollziehens von Trauer während der Shoa reflek-tiert werden sollen. Als Grundlage dienen textuelle Kommunikate des Gettos Litz-mannstadt der Jahre 1941 bis 1944. Gefragt werden soll nach Mustern des Anzeigensvon Tod, Musteranschlüssen anhand von Personifikationen und Metaphorisierun-gen des Todes und nach Musterabbrüchen als Formen des Nicht-(Mehr)-Ausdrücken-Könnens.}}, author = {{Markewitz, Friedrich}}, booktitle = {{Tod und Trauer – digital/analog}}, editor = {{Frick, Karina and Gröbel, Lea and Siever, Christina}}, keywords = {{Gettokommunikation, Gettokommunikate, kommunikative Praktiken, Shoa, Unsagbarkeit}}, pages = {{29--50}}, publisher = {{Walter de Gruyter}}, title = {{{„Der Tod tritt an jede Pritsche, an jede zerschlagene Fensterscheibe heran und fragt: 'Wann darf ich kommen?'“. Möglichkeiten und Grenzen des Sprechens über Tod und des sprachlichen Vollzugs von Trauer in Textkommunikaten des Gettos Litzmannstadt}}}, doi = {{http://doi.org/10.1515/9783111636108-003}}, volume = {{66}}, year = {{2025}}, }