@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{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}},
}
@article{65615,
abstract = {{Self-piercing riveting (SPR) is a well-established joining technique in lightweight construction, as it enables the joining of different materials without requiring pre-drilling. However, the necessary adaptation of the rivet-die combination to the respective material and thickness combinations requires a large number of specific tool sets, which significantly limits the process's flexibility. To overcome these limitations, the versatile self-piercing riveting (V-SPR) was developed, which features enhanced punch actuation in combination with a multi-range-capable rivet . In this context, the concept of a movable die was introduced, which enables an extended process window and adaptable joint formation. Kappe et al. presented initial studies demonstrating the potential of this approach . However, a detailed numerical understanding of the underlying mechanisms remains lacking. This paper presents a numerical analysis of V-SPR with a movable die using a finite element (FE) model. The model includes deformable rivets, sheet metal materials and a kinematically controlled die with adjustable movement. A parameter study was conducted to analyse the influence of die movement on the material flow of the rivet and sheets, as well as joint formation. The simulations were validated using selected experimental data. The goal is to compare the joint geometries achieved with fixed and moving dies and expand the process windows of VSPR. The results demonstrate that the movable-die concept significantly enhances the material flow of both the sheets and the rivet, resulting in a noticeably larger and more reliable interlock than what is achievable with V-SPR using a fixed die. The numerical analyses support the observations reported by Kappe et al. and extend them by providing a quantitative description of how die displacement influences the resulting interlock size. Moreover, the ability to precisely control the die movement makes it possible to join challenging sheet-metal combinations that are difficult to process with conventional setups, particularly in cases involving thicker sheet materials.}},
author = {{Kaimann, Pia Katharina and Bobbert, Mathias and Meschut, Gerson}},
issn = {{1662-9752}},
journal = {{Materials Science Forum}},
pages = {{149--160}},
publisher = {{Trans Tech Publications, Ltd.}},
title = {{{Numerical Analysis of the Influence of a Movable Die on Joint Formation in Versatile Self-Piercing Riveting}}},
doi = {{10.4028/p-8jkha8}},
volume = {{1185}},
year = {{2026}},
}
@inbook{65689,
abstract = {{The use of aluminium materials in the structural and bodywork areas of assemblies has proven to be a targeted option for lightweight design. How-ever, the reliable and cost-efficient joining of aluminium components remains a challenge. Mechanical joining methods, such as riveting, are frequently used in the automotive and aerospace construction industries. Rivets are made from heat-treated steels. Compared to steel, the use of aluminium materials for fasten-ers offers several advantages in terms of joining properties, particularly in terms of recyclability, corrosion resistance and reduced weight of the joined structure. Additionally, the manufacturing process is shorter since aluminium fasteners do not require coating. However, aluminium rivets can often not be used due to the insufficient mechanical strength of the fastener material in relation to the joining component materials.
This study systematically investigates the requirements for using solid alu-minium self-piercing rivets. The influence of rivet geometry adjustments on the joint quality is analysed using numerical simulation. The results are used to derive and evaluate an optimised rivet geometry for joining pure aluminium sheets. On this basis, solid self-drilling rivets with optimised geometry are manufactured from particle-reinforced aluminium produced in a continuous extrusion process by machining. The integration of particles increases the material’s strength. Exper-imental tests are conducted to evaluate the use of optimised solid self-piercing rivets. The quality-relevant parameters are determined and evaluated based on macrographs of the joints.}},
author = {{Koch, Steffen and Weber, Joshua and Meschut, Gerson and Stadelmann, Claudia and Böhm, Wolfgang and Merklein, Marion}},
booktitle = {{Proceedings in Engineering Mechanics}},
isbn = {{9783032236401}},
issn = {{2731-0221}},
keywords = {{Solid self-piercing riveting cdot particle-reinforced aluminium cdot continuous powder extrusion cdot Joining technology cdot Rivet geometry cdot lightweight design}},
location = {{Coimbra}},
publisher = {{Springer Nature Switzerland}},
title = {{{Particle-Reinforced Aluminium Solid Self-piercing Rivets for Joining Aluminium Alloy Sheets}}},
doi = {{10.1007/978-3-032-23641-8_1}},
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{61463,
abstract = {{Vernetztes Wissen ist ein zentrales Lernziel des Hochschulstudiums, insbesondere im interdisziplinär angelegten Studienfach Komparatistik. Um den Aufbau vernetzten Wissens bei Bachelorstudierenden der Komparatistik zu unterstützen, ist in diesem Projekt Portfolioarbeit eingesetzt worden, die als Methode selbsttätigen und selbstreflexiven Lernens geeignet erscheint, zur Auseinandersetzung mit Lerninhalten zu motivieren und zur Kompetenzentwicklung der Studierenden beizutragen. Mittels unstrukturierter Beobachtungen der Portfolioarbeit im Seminar sind inhaltliche Effekte und methodische Entwicklungen erfasst worden. Anhand anteilig quantitativer, überwiegend qualitativer Inhaltsanalysen der Portfolios sind konkrete Vernetzungen zwischen Lerninhalten ermittelt worden. Die Explorationsstudie zeigt veränderte Perspektiven und geweckte Interessen bei den Studierenden durch die Portfolioarbeit sowie vielfältige Kontextualisierungen, Vergleiche und Verknüpfungen in den Portfolios auf und bietet hierdurch einen möglichen Ansatzpunkt für strukturelle Empfehlungen für das Studienfach Komparatistik.}},
author = {{Hannebohm, Ronja}},
issn = {{2199–8825}},
journal = {{die hochschullehre: Interdisziplinäre Zeitschrift für Studium und Lehre}},
keywords = {{Portfolioarbeit, portfolio work, vernetztes Wissen, knowledge networks, Beobachtung, naturalistic observation, Inhaltsanalyse, content analysis}},
pages = {{65–80}},
publisher = {{wbv}},
title = {{{Potenziale der Portfolioarbeit für den Aufbau vernetzten Wissens im Bachelorstudium: Eine Explorationsstudie im Studienfach Komparatistik/Vergleichende Literatur- und Kulturwissenschaft}}},
doi = {{10.3278/HSL2606W}},
volume = {{12}},
year = {{2026}},
}
@article{65933,
author = {{Friesch, Kevin and Fuchs, Christian and Museba, Joel}},
issn = {{1071-4421}},
journal = {{The Communication Review}},
pages = {{1--38}},
title = {{{What is Participatory Digital Democracy?}}},
doi = {{10.1080/10714421.2026.2691015}},
year = {{2026}},
}
@article{65922,
abstract = {{Abstract
A fundamental equation of state for tetramethoxysilane (TMOS) is developed based on the available experimental data. In addition, new density and speed of sound measurements were performed specifically for this work to improve the database. Owing to the limited overall data set, additional thermodynamic properties were analyzed to support the fitting procedure and ensure physically consistent behavior. Modified representations of thermodynamic properties that are typically employed in the fitting procedure were introduced to facilitate the application of constraints. The resulting model provides a consistent description of the thermodynamic properties of TMOS.}},
author = {{Fiedler, F. and Baumhögger, Elmar and Kruse, Simon and Lemmon, E. W. and Kasper, Tina and Thol, M.}},
issn = {{0195-928X}},
journal = {{International Journal of Thermophysics}},
number = {{7}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Thermodynamic Properties of Tetramethoxysilane}}},
doi = {{10.1007/s10765-026-03770-2}},
volume = {{47}},
year = {{2026}},
}
@article{65936,
author = {{Markewitz, Friedrich and Wilk, Nicole M.}},
journal = {{Zeitschrift für Literaturwissenschaft undLinguistik}},
number = {{1}},
publisher = {{Springer}},
title = {{{Vom Hühner-Holocaust über die Öko-Diktatur zum Kulturkampf um die Currywurst. Korpuslinguistische Perspektiven auf ernährungsbezogene Politisierungen}}},
doi = {{https://doi.org/10.1007/s41244-026-00427-3 }},
volume = {{56}},
year = {{2026}},
}
@inproceedings{66007,
abstract = {{The reduction of CO2-emissions in the chemical industry is essential to meet European climate targets. Particularly, the reliance on fossil fuels for process heat supply is a key factor for CO2-emissions. Electrically driven compression heat pumps are a promising option to reduce fossil fuel consumption by upgrading low-temperature waste heat to a higher temperature level, provided that low-carbon electricity is available. However, the integration of heat pumps into chemical utility systems remains a challenge due to economic constraints and the high complexity associated with site-wide heat integration and retrofit of existing structures. This work presents a mixed-integer linear programming (MILP) approach for the optimization of utility systems with integrated heat pumps. To address computational complexity, candidate utility temperature levels are pre-selected, and feasible heat pump coefficients of performance (COP) are precomputed. The framework is applied to both greenfield and retrofit scenarios for a synthetic case study consisting of 400 process streams. In the greenfield scenario, optimal utility temperature levels and heat pump integration configurations are identified. For the retrofit scenario, temperature levels of an existing utility system are modified to reduce total annual costs (TAC). Additionally, sensitivity analysis is conducted to assess the influence of key economic and environmental parameters. The presented case studies demonstrate short solution times, highlighting the suitability of the proposed framework for screening studies and systematic sensitivity analyses in early-stage design and retrofit applications.}},
author = {{Hochhaus, Thorben and Grünewald, Marcus and Riese, Julia}},
booktitle = {{Systems and Control Transactions}},
issn = {{2818-4734}},
publisher = {{PSE Press}},
title = {{{Optimization of Site-wide Heat-Integrated Utility Systems with Heat Pumps using MILP}}},
doi = {{10.69997/sct.152209}},
volume = {{6}},
year = {{2026}},
}
@inproceedings{66008,
abstract = {{Heat pumps offer the possibility of reducing CO2-emissions in the chemical industry. However, the integration of heat pumps, especially in non-continuous processes, faces several challenges. Energy storage facilitates a way to enhance heat integration by providing a continuous supply of heat flows. By doing so, the question arises as to whether this implementation should be applied to the process or to the utility level. At the process level, there is usually more freedom, as one is not bound by the existing temperature levels of the utility system, which are mostly difficult to retrofit. Therefore, this study presents an approach that generates heat integration concepts at the process level based on two different criteria. These criteria influence which process streams are grouped for a storage implementation and therefore influence the heat integration. The aim is to maintain the heat flows as continuous as possible by integrated heat storages. Finally, the possible heat integration concept is evaluated in terms of energy efficiency by a know method for continuous process streams, here the pinch analysis.}},
author = {{Wloch, Johannes and Grünewald, Marcus and Riese, Julia}},
booktitle = {{Systems and Control Transactions}},
issn = {{2818-4734}},
publisher = {{PSE Press}},
title = {{{Development of a methodology for heat pump-based heat integration in batch processes}}},
doi = {{10.69997/sct.140728}},
volume = {{6}},
year = {{2026}},
}
@inbook{62971,
author = {{Bender, Roland and Witte, Thomas and Hattermann, Matthias and Fechner, Sabine}},
booktitle = {{Neue Materialien für einen realitätsbezogenen Mathematikunterricht}},
editor = {{Siller, Hans-Stefan and Vorhölzer, Katrin}},
isbn = {{634892}},
publisher = {{Springer}},
title = {{{Der Logarithmus zur Bestimmung des pH-Wert-Verlaufs einer Titration: Ein fächerverbindender Unterrichtsvorschlag unter Verwendung digitaler Werkzeuge}}},
year = {{2026}},
}
@inproceedings{65880,
author = {{Knaudt, Katharina and Herold-Blasius, Raja and Selter, Christoph}},
booktitle = {{Proceedings of the Fourteenth Congress of the European Society for Research in Mathematics Education (CERME14}},
pages = {{1–8}},
title = {{{Intertwining theory and practice: Design of planning phases in PD training to support effective teacher planning processes}}},
doi = {{https://hal.science/hal-05334687v1}},
year = {{2026}},
}
@inproceedings{65870,
author = {{Herold-Blasius, Raja and Kleinschmidt, Vera}},
booktitle = {{Proceedings of the Nineteenth ERME Topic Conference: Connecting the Learning of Mathematics Teaching to Practice}},
editor = {{Mosvold, R. and Fauskanger, J. and Ferretti, F. and Vondrová, N.}},
pages = {{452–459}},
title = {{{TPACK learning paths of pre-service teachers when designing digital mathematical escape games}}},
year = {{2026}},
}
@article{66059,
author = {{Kapustenko, Petro and Tovazhnyanskyy, Leonid and Arsenyeva, Olga and Riese, Julia and Varbanov, Petar Sabev}},
issn = {{1290-0729}},
journal = {{International Journal of Thermal Sciences}},
publisher = {{Elsevier BV}},
title = {{{Selection of the mini- and micro-channels geometry for improved heat recuperation in specific industrial conditions}}},
doi = {{10.1016/j.ijthermalsci.2026.111129}},
volume = {{229}},
year = {{2026}},
}
@inproceedings{64616,
abstract = {{The circular economy offers decisive advantages over the currently prevalent linear economy in industry. Firstly, the reuse of products, individual parts and material reduces the need for new production or generation and the associated consumption of energy and resources. Secondly, it helps to avoid the generation of waste. Early consideration of circular economic principles in product development processes is essential to specifically promote reuse, reparability and recycling. Efficient recycling of assemblies requires well-defined strategies. However, various challenges hinder the efficiency of technical recycling processes in industrial applications. This paper presents an Ishikawa (fishbone) diagram-based approach to systematically identify and categorize these influences. The method is implemented within an industrial framework, highlighting key obstacles such as material composition, design constraints, use of technology, framework conditions, economic limitations and regulatory challenges. By applying a scenario analysis, this approach examines potential future developments and their impact on recycling-oriented design choices. This helps to identify critical influencing factors and supports the development of resilient and sustainable industrial practices. This framework will serve as the foundation for developing an automated approach to circular design, enabling industries to more effectively integrate sustainability into their processes and adapt to changing environmental demands.}},
author = {{Rohde, Katharina and Gonzalez, Barbara Fernandez and Budde, Finn Lukas and Ott, Manuel and Mozgova, Iryna and Mendibe, Alain Alonso}},
booktitle = {{Safe and Sustainable Value Creation by Design - Proceedings of the 21st Global Conference on Sustainable Manufacturing}},
editor = {{Kohl, Holger and Seliger, Günther and Dietrich, Franz and Campana, Giampaolo}},
location = {{Bologna, Italy}},
pages = {{378--395}},
publisher = {{Springer Nature Switzerland AG}},
title = {{{Unveiling Barriers to Recycling with a Focus on Design: An Ishikawa Diagram-Based Approach with Industrial Application}}},
doi = {{https://doi.org/10.1007/978-3-032-21157-6_43}},
volume = {{1}},
year = {{2026}},
}
@inproceedings{64820,
abstract = {{Political goals, emerging EU sustainability regulations, and industrial digitalization are driving the introduction of Digital Product Passports (DPPs) to enhance transparency, traceability, and compliance across product life cycles. However, the appropriate granularity of DPP integration across product architectures remains ambiguous. This paper introduces a structured, decision-oriented framework that links product structure, regulatory relevance, and information depth to define consistent DPP levels, supporting both industry implementation and future standardization.}},
author = {{Rohde, Katharina and Budde, Finn Lukas and Patrício, Bárbara and Ferreira, Tânia and Gonçalves, Ana and Ott, Manuel and Mozgova, Iryna}},
booktitle = {{Proceedings of the Design Society}},
keywords = {{digital product passport, product architecture, circular economy, information granularity, decision-making framework}},
location = {{Cavtat, Dubrovnik, Croatia}},
pages = {{1511--1520}},
publisher = {{Cambridge University Press}},
title = {{{Digital product passports and the challenge of product structure granularity: A decision-making framework for the level of DPP integration}}},
doi = {{https://doi.org/10.1017/pds.2026.10509}},
volume = {{6}},
year = {{2026}},
}
@inproceedings{66288,
abstract = {{ABSTRACT:
Engineers simulate system behavior to support decisions in product engineering. Leveraging such engineering simulation data in strategic product planning can support idea generation and early evaluation of design alternatives and limitations. However, limited resources and expertise hinder broader uptake in strategic product planning. This paper investigates simulator integration into automated workflows and key processing components to enable simulation without in-depth expertise. This approach improves strategic product planning by creating data-based decision support.}},
author = {{Gräßler, Iris and Döhner, Niklas}},
booktitle = {{Proceedings of the Design Society}},
issn = {{2732-527X}},
keywords = {{simulation-based design, design tools, multi-/cross-/trans-disciplinary approaches, simulation data reuse}},
pages = {{357--366}},
publisher = {{Cambridge University Press (CUP)}},
title = {{{Leveraging extreme-scale simulation data: a workflow framework for multidisciplinary simulator integration}}},
doi = {{10.1017/pds.2026.10394}},
volume = {{6}},
year = {{2026}},
}
@inbook{66332,
author = {{Gräßler, Iris and Rarbach, Sven and Pottebaum, Jens}},
booktitle = {{Nachhaltigkeit in der Produktentwicklung}},
isbn = {{9783658521165}},
publisher = {{Springer Fachmedien Wiesbaden}},
title = {{{PLM und Datenökosysteme für eine MBSE-basierte zirkuläre Wertschöpfung}}},
doi = {{10.1007/978-3-658-52117-2_17}},
year = {{2026}},
}
@article{65085,
author = {{Altun, Osman and Ott, Manuel and Meihöfener, Niclas and Budde, Finn and Mozgova, Iryna}},
issn = {{1877-0509}},
journal = {{Procedia Computer Science}},
pages = {{344--353}},
publisher = {{Elsevier BV}},
title = {{{Leveraging Large Language Models in Engineering Design and Product Development: A Snapshot}}},
doi = {{10.1016/j.procs.2026.02.040}},
volume = {{276}},
year = {{2026}},
}