@article{60050, abstract = {{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.}}, author = {{Hemmrich, Simon and Nissen, Volker and Beverungen, Daniel and Pauls, Josias Daniel Miño}}, journal = {{Information Systems and e-Business Management}}, keywords = {{Information asymmetry, Trust, Reputation system, Monetary rating, Blockchain, Consulting}}, number = {{1}}, publisher = {{Springer}}, title = {{{Blockchain‑based reputation systemsfor business‑to‑business services: designing a reputation mechanism to reduce information asymmetry in professional consulting}}}, doi = {{https://doi.org/10.1007/s10257-025-00702-9}}, volume = {{23}}, year = {{2025}}, } @phdthesis{65309, author = {{Hemmrich, Simon}}, keywords = {{Reputation Systems, Rating systems, monetary ratings, incentive mechanism, systems theory, Market coordination, advanced review system}}, pages = {{347}}, publisher = {{Universität Paderborn}}, title = {{{A Design Theory for Blockchain-Based Reputation Systems : Trust and Coordination in B2B Markets}}}, doi = {{https://doi.org/10.17619/UNIPB/1-2414}}, year = {{2025}}, } @inproceedings{64803, abstract = {{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. In 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. For 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. In 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. }}, author = {{Bornmann, Peter and Littmann, Walter and Scheidemann, Claus and Hemsel, Tobias}}, location = {{Paderborn, Germany}}, title = {{{Innovative lead-free ultrasonic bending transducers for low to medium power applications}}}, year = {{2025}}, } @inproceedings{64802, abstract = {{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.}}, author = {{Littmann, Walter and Bornmann, Peter and Hemsel, Tobias and Scheidemann, Claus}}, location = {{Paderborn, Germany}}, title = {{{Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance, antiresonance, or in-between}}}, year = {{2025}}, } @book{65272, editor = {{Droß-Krüpe, Kerstin}}, title = {{{(mit K. Ruffing) Von Gerste, Göttern, Geld und Gesetzen. Eine Kultur- und Wirtschaftsgeschichte von Bier in der Antike}}}, volume = {{2}}, year = {{2025}}, } @misc{65346, author = {{Droß-Krüpe, Kerstin}}, booktitle = {{The Oxford Classical Dictionary}}, title = {{{Semiramis}}}, year = {{2025}}, } @misc{65345, author = {{Droß-Krüpe, Kerstin}}, booktitle = {{The Oxford Classical Dictionary}}, title = {{{Sardanapalus}}}, year = {{2025}}, } @inbook{65288, author = {{Droß-Krüpe, Kerstin}}, booktitle = {{Das achaimenidisch-persische Imperium}}, editor = {{Degen, J.}}, pages = {{339--347}}, title = {{{Frauenbilder und -rollen}}}, year = {{2025}}, } @inbook{65287, author = {{Droß-Krüpe, Kerstin}}, booktitle = {{Kriegerinnen im Altertum}}, editor = {{Diemke-Horst, J. and Mörtz, T.}}, pages = {{67--81}}, title = {{{Frauen als Gewalttäterinnen? Erste Überlegungen auf Basis von Petitionen aus dem griechisch-römischen Ägypten}}}, volume = {{14}}, year = {{2025}}, } @inbook{65289, author = {{Droß-Krüpe, Kerstin}}, booktitle = {{Das achaimenidisch-persische Imperium}}, editor = {{Degen, J.}}, pages = {{375--381}}, title = {{{Atossa}}}, year = {{2025}}, } @misc{65273, booktitle = {{Arenal. Revista de historia de las mujeres}}, editor = {{Droß-Krüpe, Kerstin and Garcia Ventura, Agnès}}, pages = {{7--124}}, title = {{{Pasados presentes. La construcción de estereotipos de género en la recepción del mundo antiguo}}}, volume = {{32/1}}, year = {{2025}}, } @inbook{45827, author = {{Cao, Chuntian and Steinrück, Hans-Georg}}, booktitle = {{Reference Module in Chemistry, Molecular Sciences and Chemical Engineering}}, isbn = {{9780124095472}}, pages = {{391--416}}, publisher = {{Elsevier}}, title = {{{Molecular-scale synchrotron X-ray investigations of solid-liquid interfaces in lithium-ion batteries}}}, doi = {{10.1016/b978-0-323-85669-0.00105-7}}, year = {{2024}}, } @misc{48363, author = {{Foerster, Anne}}, booktitle = {{Women in Early Medieval England}}, editor = {{Butler, Emily and Dumitrescu, Irina}}, publisher = {{Springer Textbook}}, title = {{{The Swineherd’s Wife who Scolded the King}}}, year = {{2024}}, } @misc{48362, author = {{Foerster, Anne}}, booktitle = {{Women in Early Medieval England}}, editor = {{Butler, Emily and Dumitrescu, Irina}}, publisher = {{Springer Textbook}}, title = {{{Eadburh of Wessex}}}, year = {{2024}}, } @misc{48364, author = {{Foerster, Anne}}, booktitle = {{Women in Early Medieval England}}, editor = {{Butler, Emily and Dumitrescu, Irina}}, publisher = {{Springer Textbook}}, title = {{{Seaxburh}}}, year = {{2024}}, } @inproceedings{48632, abstract = {{Digital Servitization is one of the significant trends affecting the manufacturing industry. Companies try to tackle challenges regarding their differentiation and profitability using digital services. One specific type of digital services are smart services, which are digital services built on data from smart products. Introducing these kinds of offerings into the portfolio of manufacturing companies is not trivial. Moreover, they require conscious action to align all relevant capabilities to realize the respective business goals. However, what capabilities are generally relevant for smart services remains opaque. We conducted a systematic literature review to identify them and extended the results through an interview study. Our analysis results in 78 capabilities clustered among 12 principles and six dimensions. These results provide significant support for the smart service transformation of manufacturing companies and for structuring the research field of smart services.}}, author = {{Koldewey, Christian and Fichtler, Timm and Scholtysik, Michel and Biehler, Jan and Schreiner, Nick and Sommer, Franziska and Schacht, Maximilian and Kaufmann, Jonas and Rabe, Martin and Sedlmeier, Joachim and Dumitrescu, Roman}}, keywords = {{Digital Servitization, Transformation, Capabilities, Maturity, Smart Services}}, location = {{Hawaii}}, title = {{{Exploring Capabilities for the Smart Service Transformation in Manufacturing: Insights from Theory and Practice}}}, year = {{2024}}, } @inproceedings{49354, author = {{Afroze, Lameya and Merkelbach, Silke and von Enzberg, Sebastian and Dumitrescu, Roman}}, booktitle = {{ML4CPS 2023}}, location = {{Hamburg}}, title = {{{Domain Knowledge Injection Guidance for Predictive Maintenance}}}, year = {{2024}}, } @inproceedings{49364, author = {{Scholtysik, Michel and Rohde, Malte and Koldewey, Christian and Dumitrescu, Roman}}, title = {{{Business strategy taxonomy and solution patterns for the circular economy}}}, year = {{2024}}, } @book{49504, author = {{Schlieper, Hendrik}}, publisher = {{Brill / Fink }}, title = {{{Liebestragödie. Genealogien einer französischen Gattung des 17. Jahrhunderts}}}, year = {{2024}}, } @inbook{49815, author = {{Taschl-Erber, Andrea}}, booktitle = {{Reconsidering the Letter to the Ephesians in Context }}, editor = {{Annette, Weissenrieder}}, title = {{{Making “the Two” Into One Body: De- and Recategorization of (Un-)Circumcision,}}}, year = {{2024}}, }