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Kaiser (Eds.), <i>67th Conference of Experimental Psychologists</i> (p. 132).","ama":"Böer NT, Güldenpenning I, Weigelt M. Differences of producing head fakes with and without a social partner. In: Lê-Hoa Võ M, Fiebach C, Shing YL, Sammler D, Windmann S, Kaiser J, eds. <i>67th Conference of Experimental Psychologists</i>. ; 2025:132.","chicago":"Böer, Nils Tobias, Iris Güldenpenning, and Matthias Weigelt. “Differences of Producing Head Fakes with and without a Social Partner.” In <i>67th Conference of Experimental Psychologists</i>, edited by Melissa Lê-Hoa Võ, Christian Fiebach, Yee Lee Shing, Daniela Sammler, Sabine Windmann, and Jochen Kaiser, 132, 2025.","ieee":"N. T. Böer, I. Güldenpenning, and M. 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Christoph","orcid":"0000-0002-5950-6618 ","last_name":"Scheytt","first_name":"J. Christoph"}],"title":"High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology ","main_file_link":[{"open_access":"1","url":"https://ieeexplore.ieee.org/document/11190539"}],"conference":{"end_date":"2025-05-09","location":"Long Beach, CA, USA","name":"CLEO: Conference on Lasers and Electro-Optics","start_date":"2025-05-04"},"publication_status":"accepted","year":"2025","citation":{"ieee":"C. Kress, T. Schwabe, M. M. Mihaylov, and J. C. Scheytt, “High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology ,” presented at the CLEO: Conference on Lasers and Electro-Optics, Long Beach, CA, USA.","chicago":"Kress, Christian, Tobias Schwabe, Martin Miroslavov Mihaylov, and J. Christoph Scheytt. “High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology ,” n.d.","ama":"Kress C, Schwabe T, Mihaylov MM, Scheytt JC. High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology .","apa":"Kress, C., Schwabe, T., Mihaylov, M. M., &#38; Scheytt, J. C. (n.d.). <i>High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology </i>. CLEO: Conference on Lasers and Electro-Optics, Long Beach, CA, USA.","short":"C. Kress, T. Schwabe, M.M. Mihaylov, J.C. Scheytt, in: n.d.","bibtex":"@inproceedings{Kress_Schwabe_Mihaylov_Scheytt, title={High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology }, author={Kress, Christian and Schwabe, Tobias and Mihaylov, Martin Miroslavov and Scheytt, J. Christoph} }","mla":"Kress, Christian, et al. <i>High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology </i>."}},{"department":[{"_id":"548"}],"user_id":"220","_id":"53413","language":[{"iso":"eng"}],"article_type":"original","publication":"Journal of Lie Theory","type":"journal_article","status":"public","abstract":[{"text":"For negatively curved symmetric spaces it is known that the poles of the\r\nscattering matrices defined via the standard intertwining operators for the\r\nspherical principal representations of the isometry group are either given as\r\npoles of the intertwining operators or as quantum resonances, i.e. poles of the\r\nmeromorphically continued resolvents of the Laplace-Beltrami operator. We\r\nextend this result to classical locally symmetric spaces of negative curvature\r\nwith convex-cocompact fundamental group using results of Bunke and Olbrich. The\r\nmethod of proof forces us to exclude the spectral parameters corresponding to\r\nsingular Poisson transforms.","lang":"eng"}],"volume":35,"author":[{"first_name":"Benjamin","id":"70575","full_name":"Delarue, Benjamin","last_name":"Delarue"},{"full_name":"Hilgert, Joachim","id":"220","last_name":"Hilgert","first_name":"Joachim"}],"date_created":"2024-04-11T12:31:18Z","date_updated":"2026-03-31T09:07:17Z","title":"Quantum resonances and scattering poles of classical rank one locally  symmetric spaces","issue":"(4)","publication_identifier":{"issn":["0949-5932"]},"publication_status":"inpress","intvolume":"        35","page":"787--804","citation":{"ama":"Delarue B, Hilgert J. Quantum resonances and scattering poles of classical rank one locally  symmetric spaces. <i>Journal of Lie Theory</i>. 35((4)):787--804.","ieee":"B. Delarue and J. Hilgert, “Quantum resonances and scattering poles of classical rank one locally  symmetric spaces,” <i>Journal of Lie Theory</i>, vol. 35, no. (4), pp. 787--804.","chicago":"Delarue, Benjamin, and Joachim Hilgert. “Quantum Resonances and Scattering Poles of Classical Rank One Locally  Symmetric Spaces.” <i>Journal of Lie Theory</i> 35, no. (4) (n.d.): 787--804.","short":"B. Delarue, J. Hilgert, Journal of Lie Theory 35 (n.d.) 787--804.","bibtex":"@article{Delarue_Hilgert, title={Quantum resonances and scattering poles of classical rank one locally  symmetric spaces}, volume={35}, number={(4)}, journal={Journal of Lie Theory}, author={Delarue, Benjamin and Hilgert, Joachim}, pages={787--804} }","mla":"Delarue, Benjamin, and Joachim Hilgert. “Quantum Resonances and Scattering Poles of Classical Rank One Locally  Symmetric Spaces.” <i>Journal of Lie Theory</i>, vol. 35, no. (4), pp. 787--804.","apa":"Delarue, B., &#38; Hilgert, J. (n.d.). Quantum resonances and scattering poles of classical rank one locally  symmetric spaces. <i>Journal of Lie Theory</i>, <i>35</i>((4)), 787--804."},"year":"2025"},{"language":[{"iso":"eng"}],"_id":"65262","department":[{"_id":"427"}],"user_id":"90826","editor":[{"first_name":"Ingrid","last_name":"Scharlau","full_name":"Scharlau, Ingrid"},{"last_name":"Bender","full_name":"Bender, Elena","first_name":"Elena"},{"full_name":"Patrzek, Justine","last_name":"Patrzek","first_name":"Justine"},{"first_name":"Christine","full_name":"Schreiber, Christine","last_name":"Schreiber"}],"status":"public","publication":"Psychologiedidaktik an allgemeinbildenden und beruflichen Schulen. Ein Lehrbuch mit Unterrichtsmaterialien","type":"book_chapter","title":"Digitale Ressourcen im Psychologieunterricht","publisher":"Springer","date_updated":"2026-03-31T16:34:51Z","date_created":"2026-03-31T16:33:22Z","author":[{"full_name":"Brucks , Tabea","last_name":"Brucks ","first_name":"Tabea"},{"first_name":"Heike M.","last_name":"Buhl","id":"27152","full_name":"Buhl, Heike M."}],"place":"Berlin","year":"2025","page":"201-228","citation":{"ama":"Brucks  T, Buhl HM. Digitale Ressourcen im Psychologieunterricht. In: Scharlau I, Bender E, Patrzek J, Schreiber C, eds. <i>Psychologiedidaktik an Allgemeinbildenden Und Beruflichen Schulen. Ein Lehrbuch Mit Unterrichtsmaterialien</i>. Springer; 2025:201-228.","chicago":"Brucks , Tabea, and Heike M. Buhl. “Digitale Ressourcen Im Psychologieunterricht.” In <i>Psychologiedidaktik an Allgemeinbildenden Und Beruflichen Schulen. Ein Lehrbuch Mit Unterrichtsmaterialien</i>, edited by Ingrid Scharlau, Elena Bender, Justine Patrzek, and Christine Schreiber, 201–28. Berlin: Springer, 2025.","ieee":"T. Brucks  and H. M. Buhl, “Digitale Ressourcen im Psychologieunterricht,” in <i>Psychologiedidaktik an allgemeinbildenden und beruflichen Schulen. Ein Lehrbuch mit Unterrichtsmaterialien</i>, I. Scharlau, E. Bender, J. Patrzek, and C. Schreiber, Eds. Berlin: Springer, 2025, pp. 201–228.","mla":"Brucks , Tabea, and Heike M. Buhl. “Digitale Ressourcen Im Psychologieunterricht.” <i>Psychologiedidaktik an Allgemeinbildenden Und Beruflichen Schulen. Ein Lehrbuch Mit Unterrichtsmaterialien</i>, edited by Ingrid Scharlau et al., Springer, 2025, pp. 201–28.","bibtex":"@inbook{Brucks _Buhl_2025, place={Berlin}, title={Digitale Ressourcen im Psychologieunterricht}, booktitle={Psychologiedidaktik an allgemeinbildenden und beruflichen Schulen. Ein Lehrbuch mit Unterrichtsmaterialien}, publisher={Springer}, author={Brucks , Tabea and Buhl, Heike M.}, editor={Scharlau, Ingrid and Bender, Elena and Patrzek, Justine and Schreiber, Christine}, year={2025}, pages={201–228} }","short":"T. Brucks , H.M. Buhl, in: I. Scharlau, E. Bender, J. Patrzek, C. Schreiber (Eds.), Psychologiedidaktik an Allgemeinbildenden Und Beruflichen Schulen. Ein Lehrbuch Mit Unterrichtsmaterialien, Springer, Berlin, 2025, pp. 201–228.","apa":"Brucks , T., &#38; Buhl, H. M. (2025). Digitale Ressourcen im Psychologieunterricht. In I. Scharlau, E. Bender, J. Patrzek, &#38; C. Schreiber (Eds.), <i>Psychologiedidaktik an allgemeinbildenden und beruflichen Schulen. Ein Lehrbuch mit Unterrichtsmaterialien</i> (pp. 201–228). Springer."}},{"citation":{"ama":"Timmermann J, Götte R-S, Junker A, Hesse M, Schwarzer L. <i>DART - Datengetriebene Methoden in der Regelungstechnik</i>. Vol Band 430. 1. Auflage. HNI Verlagsschriftenreihe; 2025. doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2305\">10.17619/UNIPB/1-2305</a>","apa":"Timmermann, J., Götte, R.-S., Junker, A., Hesse, M., &#38; Schwarzer, L. (2025). <i>DART - Datengetriebene Methoden in der Regelungstechnik: Vol. Band 430</i> (1. Auflage). HNI Verlagsschriftenreihe. <a href=\"https://doi.org/10.17619/UNIPB/1-2305\">https://doi.org/10.17619/UNIPB/1-2305</a>","short":"J. Timmermann, R.-S. Götte, A. Junker, M. Hesse, L. Schwarzer, DART - Datengetriebene Methoden in der Regelungstechnik, 1. Auflage, HNI Verlagsschriftenreihe, Paderborn, 2025.","bibtex":"@book{Timmermann_Götte_Junker_Hesse_Schwarzer_2025, place={Paderborn}, edition={1. Auflage}, title={DART - Datengetriebene Methoden in der Regelungstechnik}, volume={Band 430}, DOI={<a href=\"https://doi.org/10.17619/UNIPB/1-2305\">10.17619/UNIPB/1-2305</a>}, publisher={HNI Verlagsschriftenreihe}, author={Timmermann, Julia and Götte, Ricarda-Samantha and Junker, Annika and Hesse, Michael and Schwarzer, Luis}, year={2025} }","mla":"Timmermann, Julia, et al. <i>DART - Datengetriebene Methoden in der Regelungstechnik</i>. 1. Auflage, vol. Band 430, HNI Verlagsschriftenreihe, 2025, doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2305\">10.17619/UNIPB/1-2305</a>.","ieee":"J. Timmermann, R.-S. Götte, A. Junker, M. Hesse, and L. Schwarzer, <i>DART - Datengetriebene Methoden in der Regelungstechnik</i>, 1. Auflage., vol. Band 430. Paderborn: HNI Verlagsschriftenreihe, 2025.","chicago":"Timmermann, Julia, Ricarda-Samantha Götte, Annika Junker, Michael Hesse, and Luis Schwarzer. <i>DART - Datengetriebene Methoden in der Regelungstechnik</i>. 1. Auflage. Vol. Band 430. Paderborn: HNI Verlagsschriftenreihe, 2025. <a href=\"https://doi.org/10.17619/UNIPB/1-2305\">https://doi.org/10.17619/UNIPB/1-2305</a>."},"year":"2025","place":"Paderborn","edition":"1. Auflage","publication_status":"published","doi":"10.17619/UNIPB/1-2305","main_file_link":[{"url":"https://digital.ub.uni-paderborn.de/doi/10.17619/UNIPB/1-2305","open_access":"1"}],"title":"DART - Datengetriebene Methoden in der Regelungstechnik","volume":"Band 430","date_created":"2025-09-03T09:35:35Z","author":[{"last_name":"Timmermann","full_name":"Timmermann, Julia","id":"15402","first_name":"Julia"},{"first_name":"Ricarda-Samantha","last_name":"Götte","full_name":"Götte, Ricarda-Samantha","id":"43992"},{"last_name":"Junker","orcid":"0009-0002-6475-2503","id":"41470","full_name":"Junker, Annika","first_name":"Annika"},{"full_name":"Hesse, Michael","id":"29222","last_name":"Hesse","first_name":"Michael"},{"first_name":"Luis","full_name":"Schwarzer, Luis","last_name":"Schwarzer"}],"date_updated":"2026-04-01T06:14:00Z","publisher":"HNI Verlagsschriftenreihe","oa":"1","status":"public","abstract":[{"text":"Im Zuge der Digitalisierung erfahren maschinelles Lernen und datengetriebene Methoden derzeit eine große Aufmerksamkeit in Wissenschaft und Industrie. Es fehlt jedoch an Grundlagenwissen und Verständnis, wie die datengetriebenen Methoden der Informatik mit bewährten modellbasierten Ingenieursmethoden wie dem modellbasierten Entwurf in der Mechatronik und Methoden der Regelungstechnik sinnvoll kombiniert werden können, um hybride Modelle zu erhalten. Diese ingenieurwissenschaftlichen Methoden basieren auf physikalischen Verhaltensmodellen, die eine besonders verdichtete und interpretierbare Darstellung von Wissen darstellen und insbesondere kausale Zusammenhänge beschreiben. Für spezifische regelungstechnische Anwendungen gibt es umfangreiches Vorwissen in Form von bekannten Strukturen und Informationen, wie z.B. (Teil-)Modelle oder Parametersätze, die auch bei der Anwendung von Methoden wie dem maschinellen Lernen genutzt werden sollten. Eine solche sinnvolle systematische Verknüpfung ist wissenschaftlich, insbesondere im Hinblick auf die industrielle Anwendung, noch nicht ausreichend untersucht worden und sehr vielversprechend. In diesem Beitrag werden die Ergebnisse der Nachwuchsforschungsgruppe DART – Datengetriebene Methoden in der Regelungstechnik vorgestellt. Das Hauptziel war es, die synergetische Kombination von modell- und datengetriebenen Methoden für regelungstechnische Aufgaben zu erforschen und es werden alle wichtigen Forschungsergebnisse aber auch die verwendeten Grundprinzipien des maschinellen Lernens in diesem Beitrag dargestellt.","lang":"eng"},{"text":"In the course of digitalization, machine learning and data-driven methods are currently receiving a great deal of attention in science and industry. However, there is a lack of basic knowledge and understanding of how data-driven methods in computer science can be meaningfully combined with proven model-based engineering methods such as model-based design in mechatronics and control engineering methods to obtain hybrid models. These engineering methods are based on physical models, which represent a particularly condensed and interpretable representation of knowledge and, in particular, describe causal relationships. For specific control engineering applications, there is extensive prior knowledge in the form of known structures and information, such as (partial) models or parameter sets, which should also be used when applying methods such as machine learning. Such a meaningful systematic connection has not yet been sufficiently investigated scientifically, especially with regard to industrial applications, and is very promising. This contribution presents the results of the DART junior research group – Data-driven methods in control engineering. The main objective was to investigate the synergistic combination of model- and data-driven methods for control engineering tasks, and all important research results as well as the basic principles of machine learning used are presented in this publication.","lang":"eng"}],"type":"book","language":[{"iso":"ger"}],"department":[{"_id":"880"},{"_id":"153"}],"user_id":"41470","_id":"61118"},{"author":[{"last_name":"Ozuna","full_name":"Ozuna, Edna","first_name":"Edna"}],"date_created":"2026-04-01T07:16:15Z","volume":9,"date_updated":"2026-04-01T07:27:21Z","publisher":"Nomos Verlag","doi":"10.5771/2511-8676-2025-1-2","title":"First impressions matter: Shaping the servicescape to address anonymity and trust in peer-to-peer sharing economy services","issue":"1","publication_status":"published","publication_identifier":{"issn":["2511-8676"]},"citation":{"chicago":"Ozuna, Edna. “First Impressions Matter: Shaping the Servicescape to Address Anonymity and Trust in Peer-to-Peer Sharing Economy Services.” <i>Journal of Service Management Research</i> 9, no. 1 (2025): 2–18. <a href=\"https://doi.org/10.5771/2511-8676-2025-1-2\">https://doi.org/10.5771/2511-8676-2025-1-2</a>.","ieee":"E. Ozuna, “First impressions matter: Shaping the servicescape to address anonymity and trust in peer-to-peer sharing economy services,” <i>Journal of Service Management Research</i>, vol. 9, no. 1, pp. 2–18, 2025, doi: <a href=\"https://doi.org/10.5771/2511-8676-2025-1-2\">10.5771/2511-8676-2025-1-2</a>.","apa":"Ozuna, E. (2025). First impressions matter: Shaping the servicescape to address anonymity and trust in peer-to-peer sharing economy services. <i>Journal of Service Management Research</i>, <i>9</i>(1), 2–18. <a href=\"https://doi.org/10.5771/2511-8676-2025-1-2\">https://doi.org/10.5771/2511-8676-2025-1-2</a>","ama":"Ozuna E. First impressions matter: Shaping the servicescape to address anonymity and trust in peer-to-peer sharing economy services. <i>Journal of Service Management Research</i>. 2025;9(1):2-18. doi:<a href=\"https://doi.org/10.5771/2511-8676-2025-1-2\">10.5771/2511-8676-2025-1-2</a>","short":"E. Ozuna, Journal of Service Management Research 9 (2025) 2–18.","bibtex":"@article{Ozuna_2025, title={First impressions matter: Shaping the servicescape to address anonymity and trust in peer-to-peer sharing economy services}, volume={9}, DOI={<a href=\"https://doi.org/10.5771/2511-8676-2025-1-2\">10.5771/2511-8676-2025-1-2</a>}, number={1}, journal={Journal of Service Management Research}, publisher={Nomos Verlag}, author={Ozuna, Edna}, year={2025}, pages={2–18} }","mla":"Ozuna, Edna. “First Impressions Matter: Shaping the Servicescape to Address Anonymity and Trust in Peer-to-Peer Sharing Economy Services.” <i>Journal of Service Management Research</i>, vol. 9, no. 1, Nomos Verlag, 2025, pp. 2–18, doi:<a href=\"https://doi.org/10.5771/2511-8676-2025-1-2\">10.5771/2511-8676-2025-1-2</a>."},"intvolume":"         9","page":"2-18","year":"2025","user_id":"103813","_id":"65268","language":[{"iso":"eng"}],"type":"journal_article","publication":"Journal of Service Management Research","status":"public","abstract":[{"text":"The increasing number of multi-unit hosts in peer-to-peer platforms such as Airbnb poses a significant challenge to single-unit hosts, who compete in a highly professionalized market where host-guest interactions have become increasingly anonymous. However, anonymity may undermine trust and affect eWOM, crucial elements for the performance of peer-to-peer platforms, as they heavily rely on mutual trust and positive eWOM to succeed. This study investigated the effects of the presence of hosts’ personal decorations and a local welcome gift on eWOM. Perceived anonymity and trust emerge as mediating mechanisms, such that the presence of personal decorations reduced the guest’s perception of anonymity towards the host, which subsequently increased guest’s trust and their intention to spread positive eWOM. The local welcome gift did not show any significant effects. These insights contribute to servicescape research and offer practical implications for single-unit hosts to differentiate their service experience from that of professional hosts.","lang":"eng"}]},{"year":"2025","issue":"1","quality_controlled":"1","title":"Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting","date_created":"2025-05-28T08:12:28Z","publisher":"Springer","file":[{"date_created":"2025-05-28T08:05:18Z","creator":"hemmrich","date_updated":"2025-05-28T08:05:18Z","file_id":"60051","access_level":"closed","file_name":"Hemmrich_et_al-2025-Information_Systems_and_e-Business_Management.pdf","file_size":1440251,"content_type":"application/pdf","relation":"main_file","success":1}],"abstract":[{"lang":"eng","text":"Reputation systems to rate companies’ performances remain largely unexplored inresearch and are scarcely used in business-to-business (B2B) practice. Such systemsare essential for businesses seeking trustworthy partners, as they help reduce infor-mation asymmetry, lower buyers’ transaction risks, and allow high-quality serviceproviders to justify premium pricing. Unlike traditional review-based systems in thebusiness-to-consumer (B2C) context, we propose a B2B reputation mechanism inwhich buyers commit to a rating payment before a transaction. Once the buyer final-izes the rating, this payment is executed and recorded on a blockchain as an immu-table, secure ledger. Our system mimics natural trust-building mechanisms with rat-ings that are (1) monetary-based, (2) stake-based, (3) non-aggregated, (4) involvecounter-ratings, (5) selectively sellable, (6) individually comparable, (7) stored ona blockchain, (8) and monitored by a third instance. This system provides a novelapproach to fostering trust in B2B transactions by reducing information asymme-try and transaction risk. We illustrate the mechanism’s application in the consultingsector. Our analysis has identified 23 institutional trust and distrust dimensions thatpromote establishing institutional trust through the proposed mechanism. Qualita-tive interviews suggest that, while complex and challenging to apply, this mecha-nism can foster trust in B2B transactions. Given the low maturity in the applicationdomain—rating professional business services with business reputation systems—and solution domain—using monetary stakes for ratings, this system stands as apotential invention."}],"publication":"Information Systems and e-Business Management","language":[{"iso":"eng"}],"ddc":["000"],"keyword":["Information asymmetry","Trust","Reputation system","Monetary rating","Blockchain","Consulting"],"external_id":{"unknown":["https://doi.org/10.1007/s10257-025-00702-9"]},"jel":["D81","D82","L86","L10","M30"],"citation":{"ama":"Hemmrich S, Nissen V, Beverungen D, Pauls JDM. Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting. <i>Information Systems and e-Business Management</i>. 2025;23(1). doi:<a href=\"https://doi.org/10.1007/s10257-025-00702-9\">https://doi.org/10.1007/s10257-025-00702-9</a>","chicago":"Hemmrich, Simon, Volker Nissen, Daniel Beverungen, and Josias Daniel Miño Pauls. “Blockchain‑based Reputation Systemsfor Business‑to‑business Services: Designing a Reputation Mechanism to Reduce Information Asymmetry in Professional Consulting.” <i>Information Systems and E-Business Management</i> 23, no. 1 (2025). <a href=\"https://doi.org/10.1007/s10257-025-00702-9\">https://doi.org/10.1007/s10257-025-00702-9</a>.","ieee":"S. Hemmrich, V. Nissen, D. Beverungen, and J. D. M. Pauls, “Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting,” <i>Information Systems and e-Business Management</i>, vol. 23, no. 1, 2025, doi: <a href=\"https://doi.org/10.1007/s10257-025-00702-9\">https://doi.org/10.1007/s10257-025-00702-9</a>.","apa":"Hemmrich, S., Nissen, V., Beverungen, D., &#38; Pauls, J. D. M. (2025). Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting. <i>Information Systems and E-Business Management</i>, <i>23</i>(1). <a href=\"https://doi.org/10.1007/s10257-025-00702-9\">https://doi.org/10.1007/s10257-025-00702-9</a>","bibtex":"@article{Hemmrich_Nissen_Beverungen_Pauls_2025, title={Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting}, volume={23}, DOI={<a href=\"https://doi.org/10.1007/s10257-025-00702-9\">https://doi.org/10.1007/s10257-025-00702-9</a>}, number={1}, journal={Information Systems and e-Business Management}, publisher={Springer}, author={Hemmrich, Simon and Nissen, Volker and Beverungen, Daniel and Pauls, Josias Daniel Miño}, year={2025} }","mla":"Hemmrich, Simon, et al. “Blockchain‑based Reputation Systemsfor Business‑to‑business Services: Designing a Reputation Mechanism to Reduce Information Asymmetry in Professional Consulting.” <i>Information Systems and E-Business Management</i>, vol. 23, no. 1, Springer, 2025, doi:<a href=\"https://doi.org/10.1007/s10257-025-00702-9\">https://doi.org/10.1007/s10257-025-00702-9</a>.","short":"S. Hemmrich, V. Nissen, D. Beverungen, J.D.M. Pauls, Information Systems and E-Business Management 23 (2025)."},"intvolume":"        23","publication_status":"published","has_accepted_license":"1","main_file_link":[{"open_access":"1","url":"https://link.springer.com/epdf/10.1007/s10257-025-00702-9?sharing_token=fOiWqZx_ScKFAKjxu5UqWPe4RwlQNchNByi7wbcMAY6mjxpZFPB3OtpVT0rAZf9eEBt3_qXIVcZ67l3R9JVYasmuCsIimzE-xfP0N5Rimun248j0jFOnL1eBu4rypKSDFnbmR3kJ5xx-HLnCXvPvQPwpm09qOkS9GSNsiG-du60%3D"}],"doi":"https://doi.org/10.1007/s10257-025-00702-9","author":[{"last_name":"Hemmrich","id":"83557","full_name":"Hemmrich, Simon","first_name":"Simon"},{"last_name":"Nissen","full_name":"Nissen, Volker","first_name":"Volker"},{"last_name":"Beverungen","full_name":"Beverungen, Daniel","id":"59677","first_name":"Daniel"},{"full_name":"Pauls, Josias Daniel Miño","last_name":"Pauls","first_name":"Josias Daniel Miño"}],"volume":23,"oa":"1","date_updated":"2026-04-02T04:32:13Z","status":"public","type":"journal_article","file_date_updated":"2025-05-28T08:05:18Z","article_type":"original","user_id":"83557","department":[{"_id":"195"}],"_id":"60050"},{"title":"A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets","doi":"https://doi.org/10.17619/UNIPB/1-2414","publisher":"Universität Paderborn","date_updated":"2026-04-02T04:31:57Z","author":[{"first_name":"Simon","id":"83557","full_name":"Hemmrich, Simon","last_name":"Hemmrich"}],"date_created":"2026-04-02T03:52:09Z","supervisor":[{"last_name":"Beverungen","full_name":"Beverungen, Daniel","first_name":"Daniel"},{"first_name":"Dennis","last_name":"Kundisch","full_name":"Kundisch, Dennis"}],"place":"Paderborn","year":"2025","page":"347","citation":{"ama":"Hemmrich S. <i>A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets</i>. Universität Paderborn; 2025. doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2414\">https://doi.org/10.17619/UNIPB/1-2414</a>","chicago":"Hemmrich, Simon. <i>A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets</i>. Paderborn: Universität Paderborn, 2025. <a href=\"https://doi.org/10.17619/UNIPB/1-2414\">https://doi.org/10.17619/UNIPB/1-2414</a>.","ieee":"S. Hemmrich, <i>A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets</i>. Paderborn: Universität Paderborn, 2025.","apa":"Hemmrich, S. (2025). <i>A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets</i>. Universität Paderborn. <a href=\"https://doi.org/10.17619/UNIPB/1-2414\">https://doi.org/10.17619/UNIPB/1-2414</a>","bibtex":"@book{Hemmrich_2025, place={Paderborn}, title={A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets}, DOI={<a href=\"https://doi.org/10.17619/UNIPB/1-2414\">https://doi.org/10.17619/UNIPB/1-2414</a>}, publisher={Universität Paderborn}, author={Hemmrich, Simon}, year={2025} }","short":"S. Hemmrich, A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets, Universität Paderborn, Paderborn, 2025.","mla":"Hemmrich, Simon. <i>A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets</i>. Universität Paderborn, 2025, doi:<a href=\"https://doi.org/10.17619/UNIPB/1-2414\">https://doi.org/10.17619/UNIPB/1-2414</a>."},"jel":["D8"],"publication_status":"published","keyword":["Reputation Systems","Rating systems","monetary ratings","incentive mechanism","systems theory","Market coordination","advanced review system"],"language":[{"iso":"eng"}],"_id":"65309","department":[{"_id":"195"}],"user_id":"83557","status":"public","type":"dissertation"},{"ddc":["620"],"language":[{"iso":"eng"}],"file_date_updated":"2026-04-02T12:46:09Z","_id":"64803","department":[{"_id":"151"}],"user_id":"210","abstract":[{"lang":"eng","text":"Nowadays ultrasound technology is established in various fields of application like industrial production or medical technology. Besides high power ultrasound applications like ultrasonic cleaning and ultrasonic welding, which are often not strongly restricted regarding their weight, costs, and construction space, there are many applications in the low to medium power range like handheld surgical instruments, medical inhalers, or ultrasonic cutters. For the latter there is often a strong demand for low weight and construction space and low costs to be competitive in mass production. Another challenge that arises from the RoHS-directive [1] is, that new ultrasonic devices should avoid the use of lead-containing PZT-materials. Against this background there is a demand for lead-free, small and lightweight and cost-effective ultrasonic transducers.\r\nIn many of the above-mentioned applications, pre-stressed Bolted-Langevine-Transducers (BLT) based on lead-containing PZT-materials are established to generate ultrasonic vibrations. These are quite advantageous in many ways and can be built tailored to each application and even for high power of thousands of watts. But due to the required steps during their manufacturing process (machining parts, assembly, pre-stressing, frequency tuning, …), these transducers remain expensive. Furthermore, due to the operation in resonance, the construction space of these transducers is linked to their wavelength and cannot be reduced remarkably.\r\nFor these reasons, our aim is to present an innovative lead-free ultrasonic transducer for low to medium power applications, that is based on bending vibrations instead of longitudinal vibrations. This design enables to build very small transducers. Furthermore, due to their simple construction, these transducers can be built at low manufacturing costs and are well suited for industrial mass production. The use of lead-free piezoelectric materials makes this transducer design ready for future applications.\r\nIn our contribution we will present the model-based design of a lead-free 30 kHz bending transducer for applications up to 10 W. Furthermore, the comprehensive experimental analysis of this transducer-prototype in applications like mist generation or ultrasonic drilling will be presented. The results will be compared to a PZT-based bending transducer and a classical BLT to show the potential and limits of these kind of transducers and lead-free materials.\r\n"}],"status":"public","file":[{"content_type":"application/pdf","success":1,"relation":"main_file","date_updated":"2026-04-02T12:46:09Z","date_created":"2026-04-02T12:46:09Z","creator":"hemsel","file_size":1878995,"file_name":"ICU_2025_Bornmann.pdf","access_level":"closed","file_id":"65354"}],"type":"conference","title":"Innovative lead-free ultrasonic bending transducers for low to medium power applications","conference":{"location":"Paderborn, Germany","end_date":"2025-09-25","start_date":"2025-09-21","name":"International Congress on Ultrasonics (ICU)"},"date_updated":"2026-04-02T12:47:18Z","date_created":"2026-03-02T11:35:33Z","author":[{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"},{"first_name":"Walter","full_name":"Littmann, Walter","last_name":"Littmann"},{"id":"38259","full_name":"Scheidemann, Claus","last_name":"Scheidemann","first_name":"Claus"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"}],"year":"2025","citation":{"chicago":"Bornmann, Peter, Walter Littmann, Claus Scheidemann, and Tobias Hemsel. “Innovative Lead-Free Ultrasonic Bending Transducers for Low to Medium Power Applications,” 2025.","ieee":"P. Bornmann, W. Littmann, C. Scheidemann, and T. Hemsel, “Innovative lead-free ultrasonic bending transducers for low to medium power applications,” presented at the International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025.","ama":"Bornmann P, Littmann W, Scheidemann C, Hemsel T. Innovative lead-free ultrasonic bending transducers for low to medium power applications. In: ; 2025.","short":"P. Bornmann, W. Littmann, C. Scheidemann, T. Hemsel, in: 2025.","mla":"Bornmann, Peter, et al. <i>Innovative Lead-Free Ultrasonic Bending Transducers for Low to Medium Power Applications</i>. 2025.","bibtex":"@inproceedings{Bornmann_Littmann_Scheidemann_Hemsel_2025, title={Innovative lead-free ultrasonic bending transducers for low to medium power applications}, author={Bornmann, Peter and Littmann, Walter and Scheidemann, Claus and Hemsel, Tobias}, year={2025} }","apa":"Bornmann, P., Littmann, W., Scheidemann, C., &#38; Hemsel, T. (2025). <i>Innovative lead-free ultrasonic bending transducers for low to medium power applications</i>. International Congress on Ultrasonics (ICU), Paderborn, Germany."},"has_accepted_license":"1"},{"author":[{"last_name":"Littmann","full_name":"Littmann, Walter","first_name":"Walter"},{"full_name":"Bornmann, Peter","last_name":"Bornmann","first_name":"Peter"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"},{"last_name":"Scheidemann","full_name":"Scheidemann, Claus","id":"38259","first_name":"Claus"}],"date_created":"2026-03-02T11:19:46Z","date_updated":"2026-04-02T12:45:42Z","conference":{"location":"Paderborn, Germany","end_date":"2025-09-25","start_date":"2025-09-21","name":"International Conference on Ultrasonics (ICU)"},"title":"Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance,  antiresonance, or in-between","has_accepted_license":"1","citation":{"bibtex":"@inproceedings{Littmann_Bornmann_Hemsel_Scheidemann_2025, title={Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance,  antiresonance, or in-between}, author={Littmann, Walter and Bornmann, Peter and Hemsel, Tobias and Scheidemann, Claus}, year={2025} }","short":"W. Littmann, P. Bornmann, T. Hemsel, C. Scheidemann, in: 2025.","mla":"Littmann, Walter, et al. <i>Power Ultrasonic Actuators with Suddenly Changing Loads: How to Control the Amplitudes in Resonance,  Antiresonance, or in-Between</i>. 2025.","apa":"Littmann, W., Bornmann, P., Hemsel, T., &#38; Scheidemann, C. (2025). <i>Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance,  antiresonance, or in-between</i>. International Conference on Ultrasonics (ICU), Paderborn, Germany.","ieee":"W. Littmann, P. Bornmann, T. Hemsel, and C. Scheidemann, “Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance,  antiresonance, or in-between,” presented at the International Conference on Ultrasonics (ICU), Paderborn, Germany, 2025.","chicago":"Littmann, Walter, Peter Bornmann, Tobias Hemsel, and Claus Scheidemann. “Power Ultrasonic Actuators with Suddenly Changing Loads: How to Control the Amplitudes in Resonance,  Antiresonance, or in-Between,” 2025.","ama":"Littmann W, Bornmann P, Hemsel T, Scheidemann C. Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance,  antiresonance, or in-between. In: ; 2025."},"year":"2025","department":[{"_id":"151"}],"user_id":"210","_id":"64802","file_date_updated":"2026-04-02T12:41:08Z","language":[{"iso":"eng"}],"ddc":["620"],"type":"conference","status":"public","file":[{"relation":"main_file","success":1,"content_type":"application/pdf","file_id":"65353","file_name":"ICU_2025_Littmann.pdf","access_level":"closed","file_size":2522135,"date_created":"2026-04-02T12:41:08Z","creator":"hemsel","date_updated":"2026-04-02T12:41:08Z"}],"abstract":[{"text":"Power ultrasonic actuators are used in various industrial, automotive and medical applications. Examples are ultrasonic welding of plastics or metal, surgery processes like cutting of tissue or bone, and the excitation of cavitation in liquids for ultrasonic cleaning. From a physical point of view, many of these processes are characterised by non-constant damping conditions for the ultrasonic actuators, since the systems need to be driven in unloaded as well as in high-loaded states. To get high power output, the piezoelectric actuators are usually driven in or near resonance at precisely defined vibration amplitudes. This is a quite complicated task  especially if cost or mass optimized PZT transducers are used or if lead-free piezoelectric ceramics are applied to replace lead-containing materials. In particular the sudden change between loading states is very challenging for electronic excitation and control. The present contribution gives insight into typical problems that may arise in context with sudden load-changes during operation, e.g. uncontrolled jumps in voltage and velocity amplitudes. Measurements on ultrasonic power actuators being abruptly immersed into water at high amplitude are discussed for illustration. Observations during spontaneous load-changes are explained, and it is shown that several problems may be defused by driving the actuators in antiresonance or using a particular driving point in-between resonance and antiresonance (“falling edge control”). The different control strategies are investigated always using just one single hardware.","lang":"eng"}]},{"publication_status":"published","intvolume":"         2","citation":{"ama":"Droß-Krüpe K, ed. <i>(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike</i>. Vol 2.; 2025.","ieee":"K. Droß-Krüpe, Ed., <i>(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike</i>, vol. 2. Baden-Baden, 2025.","chicago":"Droß-Krüpe, Kerstin, ed. <i>(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike</i>. Vol. 2. Oeconomica. Baden-Baden, 2025.","apa":"Droß-Krüpe, K. (Ed.). (2025). <i>(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike</i> (Vol. 2).","short":"K. Droß-Krüpe, ed., (mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike, Baden-Baden, 2025.","bibtex":"@book{Droß-Krüpe_2025, place={Baden-Baden}, series={Oeconomica}, title={(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike}, volume={2}, year={2025}, collection={Oeconomica} }","mla":"Droß-Krüpe, Kerstin, editor. <i>(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike</i>. 2025."},"year":"2025","place":"Baden-Baden","volume":2,"date_created":"2026-04-01T10:18:15Z","date_updated":"2026-04-02T15:04:50Z","title":"(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. 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Mörtz (Eds.), <i>Kriegerinnen im Altertum</i> (Vol. 14, pp. 67–81).","ama":"Droß-Krüpe K. Frauen als Gewalttäterinnen? Erste Überlegungen auf Basis von Petitionen aus dem griechisch-römischen Ägypten. In: Diemke-Horst J, Mörtz T, eds. <i>Kriegerinnen im Altertum</i>. Vol 14. IPHIS. Beiträge zur altertumswissenschaftlichen Genderforschung. ; 2025:67-81.","chicago":"Droß-Krüpe, Kerstin. “Frauen als Gewalttäterinnen? Erste Überlegungen auf Basis von Petitionen aus dem griechisch-römischen Ägypten.” In <i>Kriegerinnen im Altertum</i>, edited by J. Diemke-Horst and T. Mörtz, 14:67–81. IPHIS. Beiträge zur altertumswissenschaftlichen Genderforschung. Trier, 2025.","ieee":"K. Droß-Krüpe, “Frauen als Gewalttäterinnen? Erste Überlegungen auf Basis von Petitionen aus dem griechisch-römischen Ägypten,” in <i>Kriegerinnen im Altertum</i>, vol. 14, J. Diemke-Horst and T. Mörtz, Eds. 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