@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}},
}

@article{60360,
  author       = {{Fuchs, Christian}},
  journal      = {{St. Anthony’s International Review}},
  number       = {{1}},
  pages        = {{26--39}},
  title        = {{{What is Digital Fascism? }}},
  doi          = {{10.82556/stair.v20i1.550}},
  volume       = {{20}},
  year         = {{2025}},
}

@inbook{60605,
  author       = {{Diederich, Julia and Magdeburg, Lena Maria}},
  booktitle    = {{Sexuelle Bildung in der Grundschule und der universitären Lehrer*innenausbildung. Perspektiven aus Forschung, Praxis und Lehre}},
  editor       = {{Struck, Constanze and Warburg, Saskia}},
  pages        = {{57--66}},
  publisher    = {{Verlag Barbara Budrich}},
  title        = {{{Sexuelle Bildung und (außer-)schulische Bildungspartner}}},
  year         = {{2025}},
}

@misc{65221,
  author       = {{Kullmer, Gunter and Weiß, Deborah and Duffe, Tobias and Schramm, Britta and Ostwald, Richard}},
  publisher    = {{LibreCat University}},
  title        = {{{BESCHREIBUNG DES R- UND DES TEMPERATUREINFLUSSES SOWIE DES EINLAUFVERHALTENS BEI EXPERIMENTELL BESTIMMTEN RISSFORTSCHRITTSKURVEN MIT DEM EXPONENTIALANSATZ}}},
  doi          = {{https://doi.org/10.48447/BR-2025-492}},
  year         = {{2025}},
}

@inproceedings{60504,
  author       = {{Nellius, Tom and Henne, Kevin and Hartinger, Maximilian and Meihost, Lars and Hetkämper, Tim and Zeipert, Henning and Claes, Leander and Henning, Bernd}},
  location     = {{Nürnberg}},
  title        = {{{Ultrasonic phased array interface using programmable I/O and microprocessor clock synchronisation}}},
  doi          = {{ 10.5162/SMSI2025/A5.4}},
  year         = {{2025}},
}

@techreport{65379,
  abstract     = {{Diese Studie analysiert die ESEF-Berichterstattung in Deutschland seit der Einführung der iXBRL-basierten Berichtspflicht durch die ESMA im Jahr 2020. Anhand einer Stichprobe von 610 kapitalmarktorientierten Unternehmen der Frankfurter Börse im Zeitraum 2020-2023 wird gezeigt, dass 60,5% der Jahresabschlüsse die ESEF-Anforderungen vollständig erfüllen. Größere Unternehmen haben höhere Konformitätsraten als FSE-Scale und ausländische Unternehmen. Die Untersuchung der Taxonomie-Erweiterungen verdeutlicht, dass größere Unternehmen eher Erweiterungs-Tags nutzen, was mit Theorien freiwilliger Offenlegung übereinstimmt. Die verpflichtende Einführung des Anhang-Taggings im Jahr 2022 führte zu einer erhöhten Tagging-Granularität und verbesserter Offenlegungsqualität. Die Ergebnisse verdeutlichen Herausforderungen bei der ESEF-Umsetzung, wie Zugangsbarrieren und inkonsistente Durchsetzung, und geben Einblicke in unternehmensspezifische Offenlegungspraktiken im Kontext strukturierter Berichterstattung.}},
  author       = {{Hofmann, Philipp and Sievers, Sönke and Li, Reeyarn}},
  pages        = {{251--258}},
  publisher    = {{KoR}},
  title        = {{{ESEF-Berichterstattung in Deutschland: Herausforderungen und Chancen}}},
  doi          = {{KORKOR1476665}},
  volume       = {{Heft 7-8/2025}},
  year         = {{2025}},
}

@article{56641,
  author       = {{Diller, Markus and Lorenz, Johannes and Schneider, Georg and Sureth-Sloane, Caren}},
  journal      = {{The Accounting Review}},
  number       = {{2}},
  pages        = {{71 -- 102}},
  title        = {{{Is Tax Transfer Pricing Harmonization a Panacea? Real Effects of Global Tax Transparency and Standards Consistency}}},
  doi          = {{10.2308/TAR- 2021-0477}},
  volume       = {{100}},
  year         = {{2025}},
}

@article{58500,
  author       = {{Schanz, Deborah and Siegel, Felix and Sureth-Sloane, Caren}},
  journal      = {{World Tax Journal}},
  number       = {{1}},
  pages        = {{1 -- 23}},
  title        = {{{Anti-Tax Avoidance Rules and Tax Complexity}}},
  volume       = {{17}},
  year         = {{2025}},
}

@article{56482,
  abstract     = {{Dieser Beitrag untersucht Liquiditätseffekte einer Vermögensteuer bei Mietwohnimmobilien. Mithilfe von Daten einer Immobilien-Kapitalgesellschaft werden die Wirkungen einer Vermögensteuer auf die Cashflows aus der Vermietung von Wohnimmobilien simuliert. Der Detailgrad der Daten ermöglicht dabei Analysen auf Jahres-, Regional- und Baujahresebene. Ein Abgleich mit weiteren Immobiliendaten untermauert die Vergleichbarkeit und Aussagekraft der Analysen. Die Ergebnisse der Simulation zeigen, dass die Einführung einer Vermögensteuer den Cashflow aus dem Mietgeschäft erheblich reduzieren und zu Liquiditätsproblemen führen kann. Im Durchschnitt über alle Beobachtungen
ergibt sich bei einem Vermögensteuersatz i.H.v. 2 % ein negativer Cashflow nach Berücksichtigung aller Kosten. Generell bedeutet dies, dass wachstumsorientierte Immobilien durch eine Vermögensteuer liquiditätsmäßig stärker belastet werden als mietrenditeorientierte Immobilien. Insbesondere in Großstädten mit hohen Immobilienwerten, aber verhältnismäßig geringen Mieten, können die Liquiditätseffekte mehr als dreimal so hoch ausfallen wie in ländlichen bzw. industriell-geprägten Regionen, was zu einem relativen Attraktivitätsverlust führen kann. Durch die Entkopplung der Vermögensteuer von den Mieterträgen zeichnet sich eine starke Abhängigkeit der Steuerlast von aktuellen Marktentwicklungen und dem Zinsumfeld ab, was eine zusätzliche Unsicherheit für Investoren darstellt. Diese steuerliche Unsicherheit könnte sich potentiell auf die Investitionsbereitschaft auswirken und sollte daher
in politischen Diskussionen über die Wiedereinführung einer Vermögensteuer berücksichtigt werden.}},
  author       = {{Maiterth, Ralf and Piper, Yuri and Sureth-Sloane, Caren}},
  journal      = {{Steuer und Wirtschaft}},
  number       = {{1}},
  pages        = {{67 -- 81}},
  title        = {{{Liquiditätseffekte einer Vermögensteuer bei Mietwohnimmobilien}}},
  volume       = {{102}},
  year         = {{2025}},
}

@article{62110,
  author       = {{Schönhärl, Korinna and Sureth-Sloane, Caren}},
  journal      = {{Ethik und Gesellschaft}},
  pages        = {{1--31}},
  title        = {{{Steuern und Steuergerechtigkeit – Ein Gespräch}}},
  doi          = {{10.18156/eug-2-2025-art-2.}},
  volume       = {{19 (2): Die andere Seite der sozialen Gerechtigkeit: Eine gerechtere Finanzierung steigender öffentlicher Ausgaben}},
  year         = {{2025}},
}

@techreport{65383,
  abstract     = {{This paper introduces a predictive model for German mergers and acquisitions (M& A) activity leveraging deep feedforward neural networks (DFNN) incorporating well-established traditional variables (also known as features), along with a ChatGPT-based M& A sentiment score (MASS) and unconventional predictors such as beer sales and weather data. We demonstrate that the inclusion of sentiment and non-traditional variables enhances predictive performance. Our findings provide an important empirical foundation for understanding near-term fluctuations in German M& A activity and offer a forecasting tool relevant to both practitioners and researchers.}},
  author       = {{Sievers, Sönke and Li, Reeyarn and Degen, Dominik and Kengelbach, Jens and Pietrogrande, Francesca}},
  issn         = {{1437-8981}},
  pages        = {{302--308}},
  title        = {{{Beer, Cars & Fundamentals: Predicting German M& A activity}}},
  doi          = {{CFCF1480783}},
  volume       = {{Heft 11-12/2025}},
  year         = {{2025}},
}

@inbook{65393,
  author       = {{König, Katrin}},
  booktitle    = {{Engaging nicene trinitarianism : historical analysis, theological exploration, and contemporary relevance}},
  editor       = {{Grebe, Matthias and Hamilton, Nadine and Schlenker, Christian}},
  pages        = {{217–236}},
  publisher    = {{T&T Clark}},
  title        = {{{Trinity and Empathy. The modern renewal of Trinitarian ontology and the experience of empathy in the phenomenology of Edith Stein}}},
  doi          = {{10.5040/9780567720795}},
  year         = {{2025}},
}

@inproceedings{65411,
  author       = {{Quinting, J. and Avramovic, P.  and Brassel, S. and Brunner, B.  and Jonas, Kristina and Rietdijk, R. and Rubi-Fessen, I. and Stenneken, P.  and Togher, L. }},
  pages        = {{2--287}},
  title        = {{{The Co-CALIBRATE Framework: An Evidence-Based Framework for the Cultural Adaptation of Brain Injury Intervention Tools with Stakeholder Engagement. }}},
  doi          = {{10.1080/02699052.2025.2507554}},
  volume       = {{39}},
  year         = {{2025}},
}

@inproceedings{65412,
  author       = {{Quinting, J. and Avramovic, P. and Brassel, S.  and Brunner, M.  and Jonas, Kristina and Rietdijk, R. and Rubi-Fessen, I. and Stenneken, P. and Togher, L.}},
  booktitle    = {{Jahrestagung der Gesellschaft für Aphasieforschung und -behandlung (GAB) e.V., Aachen.}},
  title        = {{{Das Co-CALIBRATE Framework: Ein international konsentiertes, evidenzbasiertes Framework für kultur-sensitive Adaptationen von Therapie-Ressourcen im Bereich Sprach- und Kommunikationsstörungen nach Hirnschädigungen}}},
  year         = {{2025}},
}

@inproceedings{65414,
  author       = {{Quinting, J. and Avramovic, P. and Brassel, S. and Brunner, M.  and Jonas, Kristina and Rietdijk, R. and Rubi-Fessen, I. and Stenneken, P.  and Togher, L.}},
  booktitle    = {{15. World Congress on Brain Injury, Montreal, Canada}},
  location     = {{Montreal, Canada}},
  title        = {{{Co-CALIBRATE: An Evidence-Based Framework For The Cultural Adaptation of Brain Injury Intervention Tools With Stakeholder Engagement}}},
  year         = {{2025}},
}

@article{65447,
  author       = {{Daniel-Söltenfuß, Desiree}},
  journal      = {{BWP@: Berufs- und Wirtschaftspädagogik - online}},
  pages        = {{1--26}},
  title        = {{{Der Weg als Ziel: Die Gestaltung von Transferprozessen in Innovationsprogrammen am Beispiel InnoVET}}},
  volume       = {{49}},
  year         = {{2025}},
}

@inproceedings{59894,
  abstract     = {{<jats:p>Abstract. This study presents intrinsic lubrication as a novel approach to deep drawing processes, using additively manufactured, lubricant-permeable tools to minimize lubricant consumption and improve efficiency. Two systems were evaluated: a passive system based on capillary action and gravity, and an active system using pumped delivery for precise, on-demand application. Experimental tests were conducted on micro-bores (0.2-0.5 mm) to demonstrate their suitability for lubricant transport. Smaller bores have excellent capillary action but are prone to clogging, while larger bores offer higher permeability. The passive system is resource-efficient but requires adjustments to counteract gravitational asymmetry. The active system provides consistent lubricant distribution but is more complex. These findings provide a basis for optimizing intrinsic lubrication systems.</jats:p>}},
  author       = {{Cakici, Ermir and Homberg, Werner}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  location     = {{Paestum, Italien}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{Intrinsic lubrication: A new approach in the context of the deep drawing process}}},
  doi          = {{10.21741/9781644903599-122}},
  volume       = {{54}},
  year         = {{2025}},
}

@inbook{64218,
  author       = {{Kokew, Stephan Matthias}},
  booktitle    = {{Islamic Theological and Pedagogical Approaches to Religious Education. Interdisciplinary Perspectives on Contemporary Challenges}},
  editor       = {{Karagedik, Ulvi and Yağdı, Senol and Kocyigit, Ibrahim}},
  isbn         = {{ 978-3-7560-1005-9}},
  keywords     = {{Tolerance, Islamic Tradition}},
  pages        = {{263--278}},
  publisher    = {{Nomos}},
  title        = {{{Islamic Principles of Tolerance and Its Relevance for an Islamic Religious Pedagogy -Teaching ›Tolerance‹ in a Contemporary Islamic Education Context: Observations on Semantical Differentiations of Terms and Meanings}}},
  volume       = {{1}},
  year         = {{2025}},
}

@inbook{63867,
  author       = {{Freitag, Christine and Temmen, Katrin}},
  booktitle    = {{Sustainable Energy Development in East Africa: Interdisciplinary Approaches}},
  editor       = {{Freitag, Christine and Temmen, Katrin and Hehenkamp, Burkhard and Klaus, Tobias and Krauter, Stefan}},
  isbn         = {{9783987265013}},
  pages        = {{17--19}},
  title        = {{{Introduction}}},
  year         = {{2025}},
}