@article{65266, abstract = {{ABSTRACT This work is concerned with the modeling of a cold‐box sand, a composition of sand grains and a resin binder. To this end, experiments are performed, which show the following characteristics: localization phenomena in the form of a shear band, softening behavior in the force‐displacement curve, and asymmetric behavior for compression and tension. To model this complex material behavior, a micromorphic continuum is used. In the present contribution, we focus on the linear‐elastic regime and demonstrate the identifiability of micromorphic material parameters under deliberately induced inhomogeneous deformation states. In addition to the degrees of freedom of a classical continuum, the micromorphic model has additional degrees of freedom, introduced here in a phenomenological sense to represent kinematically enriched deformation modes associated with the granular microstructure. Accordingly, the micromorphic fields are not interpreted as a separate physical scale (e.g., “binder” vs. “grains”), but as an effective continuum description at the specimen scale. This contribution addresses parameter identification for a micromorphic model of cold‐box sand, with a clear separation between homogeneous deformation states governing classical elastic parameters and inhomogeneous states required to activate and identify micromorphic length‐scale parameters. The main challenge lies in identifying the micro material parameters. To determine these, the corresponding gradient terms in the constitutive formulation must be triggered via properly tuned experiments. Micro‐parameter identification is demonstrated using synthetic data generated from a boundary‐value problem with inhomogeneous displacement fields. The chosen benchmark enables controlled activation of gradient terms and thereby renders optimization‐based identification of micromorphic parameters feasible. The synthetic example is deliberately chosen to assess feasibility and identifiability under controlled conditions, thereby isolating micromorphic identifiability aspects from experimental uncertainties. The novelty of the contribution lies in explicitly linking micromorphic parameter identifiability to kinematic inhomogeneity, and in demonstrating this link within a tractable forward– inverse setting for a linear‐elastic micromorphic continuum.}}, author = {{Börger, Alexander and Mahnken, Rolf and Caylak, Ismail and Ostwald, Richard}}, issn = {{1617-7061}}, journal = {{Proceedings in Applied Mathematics and Mechanics}}, number = {{2}}, publisher = {{Wiley}}, title = {{{Aspects of Parameter Identification for a Micromorphic Continuum applied to a Cold‐Box Sand}}}, doi = {{10.1002/pamm.70093}}, volume = {{26}}, year = {{2026}}, } @inbook{65168, author = {{Keuchen, Marion and Lindemeyer, Sabine}}, booktitle = {{Seelsorge im Lebensraum Schule. Ökumenische Perspektiven}}, editor = {{Igrec, Marie-Theres and Lehner-Hartmann, Andrea and Paulovics, Clemens and Rothgangel, Martin and Wenk, Anne-Kathrin}}, isbn = {{978-3-451-02651-5}}, pages = {{151--171}}, publisher = {{Herder}}, title = {{{Keuchen, Marion/ Lindemeyer, Sabine: Demokratiebildung anhand eines (schul-)seelsorglichen Rituals im Rahmen der Lehramtsausbildung}}}, year = {{2026}}, } @article{65311, abstract = {{Information Systems (IS) is rooted in systems theory. Systems theory offers powerful concepts to address challenges of growing system complexity and non-systemic design approaches in information systems. Despite its systemic origins, systems theory remains a peripheral topic in IS. The study addresses this gap by introducing a comprehensive framework of 52 systems-theoretical concepts to guide the design of complex IS artifacts. We synthesize scattered systems knowledge from diverse disciplines to provide a unified level of abstraction for complex information system design. We apply the framework to a use case of business reputation systems to show how the systems lens informs the design of a novel, complex information system. We make three key contributions to the literature. First, the framework provides a common ground for interdisciplinary research in information system design. Second, it offers a unified level of abstraction grounded in systems theory that serves as a coherent basis for artifact design. Third, it demonstrates the potential of systems theory as a foundational justificatory knowledge base. Furthermore, we provide guidance on applying the framework across multiple modes of reasoning, alongside further application guidelines. The study thus serves as a bridge between the body of systems knowledge and contextual design in IS.}}, author = {{Ibrahimli, Ulvi and Hemmrich, Simon and Winkelmann, Axel}}, journal = {{Communication of the Association for Information Systems}}, keywords = {{Information Systems Research, Systems Theory, System Complexity, System Design, Design Science}}, publisher = {{AIS}}, title = {{{Bridging Systems Theory and Information Systems: A Framework for Designing Complex Information Systems}}}, doi = {{https://aisel.aisnet.org/cais/vol58/iss1/37/}}, year = {{2026}}, } @inbook{65310, abstract = {{Trust between client and consultant is perhaps the most important asset in con-sulting, as this is a highly intangible knowledge-intensive business that concerns is-sues of outstanding strategic and operational importance for the customers. Cli-ents who have not worked with a particular consultancy face considerable risk when they place an order while lacking reliable information about the service quality they can expect. There is a strong link between trust and reputation, as the positive reputation of a consultancy can act as a substitute for a new client’s missing individual experience with the provider, fostering trust in the service quali-ty. Thus, creating, maintaining, and demonstrating a good reputation is of signifi-cant importance for consultancies in a very competitive industry. To facilitate trustworthy signals, we design and implement a novel reputation mechanism that carries a monetary weight stored on a blockchain network as an immutable, decentralized, and transparent ledger. Based on an implementation in the Ethereum network and subsequent evaluation, we conclude that the reputation mechanism can contribute to leveling information asymmetry and reducing risk while increasing reputation and trust. The mechanism lends itself to being used in other business-to-business scenarios that suffer from similar information asymmetries.}}, author = {{Hemmrich, Simon and Nissen, Volker}}, booktitle = {{ Advanced Studies in Consulting Research and Digitalization – A Scientific Update on the Digital Transformation of the Consulting Industry. Springer.}}, editor = {{Nissen, Volker}}, keywords = {{Reputation Systems, Consulting, Design Science Invention, Incentive, Blockchain, Monetary ratings, building trust, reduce information asymmetry consulting, B2B reputation system, consulting risk reduction, supplier evaluation system}}, title = {{{A blockchain-based reputation system for consulting}}}, year = {{2026}}, } @inproceedings{65313, author = {{Ibrahimli, Ulvi and Hemmrich, Simon and Winkelmann, Axel}}, location = {{Münster}}, title = {{{Reputation as a Sociotechnical Design Problem: A Social Systems Theory Lens for Business Reputation Systems}}}, year = {{2026}}, } @inbook{65252, author = {{Becher, Andrea and Diederich, Julia and Gläser, Eva}}, booktitle = {{Perspektiv(en)wechsel. Sachunterricht neu denken}}, editor = {{Schmeinck, Daniela and Peschel, Markus and Goll, Thomas}}, pages = {{35--44}}, publisher = {{Verlag Julius Klinkhardt}}, title = {{{Lehrkräfteprofessionalisierung im Sachunterricht – Chancen und Herausforderungen durch Künstliche Intelligenz (KI)}}}, volume = {{36}}, year = {{2026}}, } @misc{65356, author = {{Droß-Krüpe, Kerstin and Ghetta, Marcello}}, booktitle = {{RAC}}, pages = {{968--980}}, publisher = {{Hiersemann}}, title = {{{Viehhaltung }}}, volume = {{33}}, year = {{2026}}, } @article{65373, abstract = {{To reduce CO₂ emissions, the automotive industry is adopting multi-material structures. Fusion-based joining reaches its limits for aluminium–steel due to brittle intermetallic phases and mismatched thermophysical properties; therefore, mechanical joining (e.g., SPR) is used. Though conventional SPR requires tool changes for different stack-ups. Versatile self-piercing riveting (V-SPR) addresses this with an extended punch actuator and a multi-range-capable rivet (Kappe in PERD16:363–378, 2022), enabling joints up to 600 MPa across varying thicknesses without retooling. With the use of ultra-high-strength steels up to 1000 MPa, optimisation is required. This study quantifies how rivet shank geometry affects joint formation using a design of experiments and validated 2D axisymmetric FE simulations. The optimum depends strongly on the material system. For CP1000–EN AW-6014, maximum interlock f is predicted for a medium shank thickness of about 0.73 mm, a small internal foot radius of 0.620 mm, and a deeper drill depth of 3.136 mm, yielding f fc =0.4503 mm with a desirability of 0.954. For EN AW-6014–EN AW-6014, the optimum shifts to a thinner shank of 0.670 mm, a larger internal foot radius of 0.820 mm and a shallow drill depth of 2.30 mm, giving ffc = 0.3023 mm with a desirability of 1.0. A compromise geometry of 0.713 mm shank thickness, 0.776 mm internal foot radius and 2.755 mm drill depth achieves ffc = 0.3641 mm for CP1000–aluminium and ffc = 0.1851 mm for aluminium–aluminium with an overall desirability D = 0.6378, expanding V-SPR to ultra-high-strength steel–aluminium joints while maintaining aluminium joinability.}}, author = {{Kaimann, Pia Katharina and Ritter, Nico and Bobbert, Mathias and Meschut, Gerson}}, issn = {{2731-6564}}, journal = {{Discover Mechanical Engineering}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Influence of the shank geometry on the joint formation of the versatile self-piercing riveting of ultra-high-strength steel-aluminium and aluminium-aluminium assemblies}}}, doi = {{10.1007/s44245-026-00221-y}}, volume = {{5}}, year = {{2026}}, } @inbook{65381, author = {{Menzel, Tessa-Marie}}, booktitle = {{Digitale Ratgebermedien}}, editor = {{Sauerbrey, Ulf and Menzel, Tessa-Marie and Hemmerich, Fabian}}, pages = {{143--156}}, publisher = {{Ergon}}, title = {{{Elternrat in Sozialen Medien aus Produzent*innenperspektive - Motive, Rollenverständnis und Herstellungspraktiken}}}, doi = {{https://doi.org/10.5771/9783987401589-143}}, year = {{2026}}, } @book{65372, editor = {{Sauerbrey, Ulf and Menzel, Tessa-Marie and Hemmerich, Fabian}}, pages = {{458}}, publisher = {{Ergon}}, title = {{{Digitale Ratgebermedien}}}, doi = {{https://doi.org/10.5771/9783987401589}}, volume = {{9}}, year = {{2026}}, } @article{56815, abstract = {{This study investigates the determinants of tax complexity in Indonesia, focusing on the perspectives of tax officers and firms, and thus provides a case study relevant to developing countries. Understanding tax complexity in this context is crucial as developing nations frequently encounter legislative, fiscal, and administrative challenges that exacerbate their tax complexity. Complexity can hinder investment, impair tax revenue collection, and impede economic development. The authors adapt a global survey instrument to the Indonesian context and collect responses from Indonesian tax officers and firms. Transfer pricing is perceived as the most complex tax regulation which is consistent with cross-country studies. However, in contrast to the global findings, statutory tax rates and taxes on dividends rank second and third in Indonesia. While Indonesian tax officers emphasize the complexity of transfer pricing regulations, firms are more concerned about the complexity of tax procedures, especially tax guidance and tax audits. Furthermore, comparative analyses show that tax officers perceive tax regulations as being more complex than tax procedures. In contrast, firms perceive the opposite, particularly for tax audits. The findings offer a nuanced picture of tax complexity in a developing country and provide guidance for tax reforms in Indonesia. They also serve as a commencement for further analyses of developing countries.}}, author = {{Schipp, Adrian and Siahaan, Fernando and Sureth-Sloane, Caren}}, journal = {{Intertax}}, number = {{2}}, pages = {{102--122}}, title = {{{Determinants of Tax Complexity: Evidence from a Developing Country}}}, doi = {{http://dx.doi.org/10.2139/ssrn.4924632}}, volume = {{54}}, year = {{2026}}, } @inbook{65385, author = {{Fuchs, Christian}}, booktitle = {{The Routledge Companion to Critical Marketing}}, editor = {{Tadajewski, Mark and Higgins, Matthew and Denegri-Knott, Janice and Varman, Rohit}}, isbn = {{9781003561347}}, pages = {{563--578}}, publisher = {{Routledge}}, title = {{{Social Media, Big Data, and Critical Marketing}}}, doi = {{10.4324/9781003561347-36}}, year = {{2026}}, } @article{65415, abstract = {{Der Beitrag untersucht die Einführung von iPads im  Musikunterricht einer Sekundarschule aus einer soziomaterialen Perspektive. Auf der Grundlage einer mehrjährigen Begleitung wird mit Verfahren der Situationsanalyse aufgezeigt, wie die Digitaltechnologien – insbesondere die App GarageBand – in bestehende Fachkulturen, Dingordnungen und Unterrichtsroutinen eingebettet werden. Die Analyse offenbart, wie im Musikunterricht der Digitalisierungsprozess oft an alten Dingen, vertrauten Routinen und fachimmanenten Ideologien, wie dem Klaviozentrismus und einer Liveness-Norm, scheitert. Zugleich ergänzt ein alternatives Verständnis unterrichtlichen Musiklernens das handwerkliche Reproduzieren und Selbstüberwinden in Präsenzdarbietungen um die Klangarbeit beim explorativ-selbstständigen Erfinden und Produzieren präziser Aufnahmen. Die Ergebnisse werden hinsichtlich der Debatten um Digitalisierung in Schule und Musikunterricht diskutiert.}}, author = {{Godau, Marc}}, issn = {{2190-3174}}, journal = {{Beiträge empirischer Musikpädagogik}}, keywords = {{Digitalisierung, GarageBand, Tablet-Klassen, Fachkultur, Situationsanalyse}}, number = {{1}}, pages = {{1--52}}, publisher = {{Sachsische Landesbibliothek, Staats- und Universitatsbibliothek Dresden}}, title = {{{Vom „Push the Keys“ zum „Touch the Screen“? Eine Spurensuche zur Konkurrenz der Dinge im Musikunterricht.}}}, doi = {{10.62563/bem.v18i1.269}}, volume = {{18}}, year = {{2026}}, } @inbook{65416, author = {{Godau, Marc and Ahlers, Michael}}, booktitle = {{Handbuch Musikpädagogik: Grundlagen - Forschung - Diskurse}}, editor = {{Dartsch, Michael and Knigge, Jens and Niessen, Anne and Platz, Friedrich and Stöger, Christine}}, pages = {{111--119}}, publisher = {{Waxmann}}, title = {{{Medientheorien}}}, year = {{2026}}, } @inbook{65420, author = {{Godau, Marc}}, booktitle = {{Handbuch Musikpädagogik: Grundlagen - Forschung - Diskurse}}, editor = {{Dartsch, Michael and Knigge, Jens and Niessen, Anne and Platz, Friedrich and Stöger, Christine}}, pages = {{595--604}}, publisher = {{Waxmann}}, title = {{{Die Dinge und der Musikunterricht}}}, year = {{2026}}, } @article{65460, abstract = {{Beamsplitters represent fundamental components in both classical and quantum optical systems, enabling the distribution of light, as well as the generation of interference, superposition, and entanglement. However, optical networks constructed from conventional bulk 2 × 2-beamsplitters encounter inherent scalability issues, as the number of required beamsplitters scales quadratically with the number of optical modes for a fully connected network. Metasurfaces offer a promising route to overcome these constraints. By manipulating light at the wavelength scale, compact optical components with advanced functionalities can be constructed, which address several modes simultaneously. In this work, we design and experimentally utilize a metasurface as a multiport beamsplitter. Furthermore, we realized a multimode interferometer composed of two cascaded metasurfaces. We characterize the individual and cascaded metasurfaces by using classical light, showing controllable splitting ratios through tunable phase relations. We then expand the approach to quantum light, employing single photons to demonstrate second- and third-order photon correlations as well as single photon interference across multiple spatial paths. These results establish metasurface-based multiport beamsplitters as a scalable and reconfigurable platform bridging classical and quantum photonics. }}, author = {{Aschwanden, Rebecca and Claro-Rodríguez, Nicolás and Zhao, Ruizhe and Kallert, Patricia Anna Maria and Krieger, Tobias and Buchinger, Quirin and Covre da Silva, Saimon F. and Stroj, Sandra and Rota, Michele and Höfling, Sven and Huber-Loyola, Tobias and Rastelli, Armando and Trotta, Rinaldo and Huang, Lingling and Bartley, Tim and Jöns, Klaus and Zentgraf, Thomas}}, issn = {{2330-4022}}, journal = {{ACS Photonics}}, keywords = {{metasurface, beamsplitter, interferometer, quantum network, single photons, nanophotonics}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Cascaded Metasurface Interferometer for Multipath Interference with Classical and Quantum Light}}}, doi = {{10.1021/acsphotonics.6c00096}}, year = {{2026}}, } @article{65316, abstract = {{Metasurfaces are powerful tools for manipulating light using small structures on the nanoscale. In most metasurfaces, near-field couplings are treated as being unfavorable perturbations. Here, we experimentally investigate a structure consisting of sinusoidally modulated silicon waveguides where near-field coupling of local resonances leads to negative coupling, i.e., a negative coupling constant. This gives rise to wave-vector-dependent eigenstates of elliptical, linear, and circular polarizations. In particular, fully circular polarization states are not only present at a single point in momentum space (k-space) but also along a line. This circular polarization line, as well as a linear polarization line, emanates from a polarization degeneracy at the Dirac point. We experimentally validate the existence of these eigenstates and demonstrate the energy-, polarization-, and wave vector dependence of this metasurface as well as its sensitivity to fabrication tolerances. By tuning the incident k-vector, certain polarization-energy eigenstates are strongly reflected, allowing for uses in angle-tunable polarization filters and light sources.}}, author = {{Wetter, Helene and Wingenbach, Jan and Rehberg, Falk and Gao, Wenlong and Schumacher, Stefan and Zentgraf, Thomas}}, issn = {{2330-4022}}, journal = {{ACS Photonics}}, keywords = {{metasurface, waveguides, Dirac point, polarization, negative coupling}}, pages = {{2128--2133}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Polarization- and Wave-Vector Selective Optical Metasurface with Near-Field Coupling}}}, doi = {{10.1021/acsphotonics.5c02865}}, volume = {{13}}, 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}}, } @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}}, } @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}}, }