TY - GEN AU - Hami Dindar, Iman AU - Lutters, Nicole AU - Kenig, Eugeny Y. ID - 52579 TI - Wässrige Glucosaminlösung als neues Lösungsmittel zur CO2-Abscheidung ER - TY - JOUR AB - In applications of piezoelectric actuators and sensors, the dependability and particularly the reliability throughout their lifetime are vital to manufacturers and end-users and are enabled through condition-monitoring approaches. Existing approaches often utilize impedance measurements over a range of frequencies or velocity measurements and require additional equipment or sensors, such as a laser Doppler vibrometer. Furthermore, the non-negligible effects of varying operating conditions are often unconsidered. To minimize the need for additional sensors while maintaining the dependability of piezoelectric bending actuators irrespective of varying operating conditions, an online diagnostics approach is proposed. To this end, time- and frequency-domain features are extracted from monitored current signals to reflect hairline crack development in bending actuators. For validation of applicability, the presented analysis method was evaluated on piezoelectric bending actuators subjected to accelerated lifetime tests at varying voltage amplitudes and under external damping conditions. In the presence of a crack and due to a diminished stiffness, the resonance frequency decreases and the root-mean-square amplitude of the current signal simultaneously abruptly drops during the lifetime tests. Furthermore, the piezoelectric crack surfaces clapping is reflected in higher harmonics of the current signal. Thus, time-domain features and harmonics of the current signals are sufficient to diagnose hairline cracks in the actuators. AU - Aimiyekagbon, Osarenren Kennedy AU - Bender, Amelie AU - Hemsel, Tobias AU - Sextro, Walter ID - 51518 IS - 3 JF - Electronics KW - piezoelectric transducer KW - self-sensing KW - fault detection KW - diagnostics KW - hairline crack KW - condition monitoring SN - 2079-9292 TI - Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions VL - 13 ER - TY - CHAP AU - Fuchs, Christian ED - Litschka, Michael ED - Paganini, Claudia ED - Rademacher, Lars ID - 51364 SN - 9783748942801 T2 - Digitalisierte Massenkommunikation und Verantwortung TI - Grundlagen einer Ethik des Radikalen Digitalen Humanismus ER - TY - JOUR AU - Rezat, Sebastian ID - 52584 JF - ZDM – Mathematics Education TI - Research on curriculum resources in mathematics education: a survey of the field ER - TY - JOUR AU - Bodden, Eric AU - Pottebaum, Jens AU - Fockel, Markus AU - Gräßler, Iris ID - 52587 IS - 1 JF - IEEE Security & Privacy KW - Law KW - Electrical and Electronic Engineering KW - Computer Networks and Communications SN - 1540-7993 TI - Evaluating Security Through Isolation and Defense in Depth VL - 22 ER - TY - GEN AU - Treder, Alexandra ID - 50208 T2 - Forschungsportal für Spracherwerb und Migration (daz-portal) TI - Alexandra Treder (Universität Paderborn) rezensiert: Döll, Marion & Michalak, Magdalena (2023): Deutsch als Zweitsprache und inklusive Bildung. [Deutsch als Zweitsprache – Positionen, Perspektiven, Potenziale, Bd. 3]. Münster: Waxmann, 142 Seiten. ISBN 978-3-8309-4711-0. VL - 26 ER - TY - BOOK ED - Tatari, Muna ED - Husic, Ahmed ID - 52590 TI - The Divine Attributes in Classical Islamic Thought and Con-temporary Islamic Theology ER - TY - JOUR AB - Data-driven models for nonlinear dynamical systems based on approximating the underlying Koopman operator or generator have proven to be successful tools for forecasting, feature learning, state estimation, and control. It has become well known that the Koopman generators for control-affine systems also have affine dependence on the input, leading to convenient finite-dimensional bilinear approximations of the dynamics. Yet there are still two main obstacles that limit the scope of current approaches for approximating the Koopman generators of systems with actuation. First, the performance of existing methods depends heavily on the choice of basis functions over which the Koopman generator is to be approximated; and there is currently no universal way to choose them for systems that are not measure preserving. Secondly, if we do not observe the full state, we may not gain access to a sufficiently rich collection of such functions to describe the dynamics. This is because the commonly used method of forming time-delayed observables fails when there is actuation. To remedy these issues, we write the dynamics of observables governed by the Koopman generator as a bilinear hidden Markov model, and determine the model parameters using the expectation-maximization (EM) algorithm. The E-step involves a standard Kalman filter and smoother, while the M-step resembles control-affine dynamic mode decomposition for the generator. We demonstrate the performance of this method on three examples, including recovery of a finite-dimensional Koopman-invariant subspace for an actuated system with a slow manifold; estimation of Koopman eigenfunctions for the unforced Duffing equation; and model-predictive control of a fluidic pinball system based only on noisy observations of lift and drag. AU - Otto, Samuel E. AU - Peitz, Sebastian AU - Rowley, Clarence W. ID - 33461 IS - 1 JF - SIAM Journal on Applied Dynamical Systems TI - Learning Bilinear Models of Actuated Koopman Generators from Partially-Observed Trajectories VL - 23 ER - TY - THES AB - Ultraschallsysteme für das Herstellen für Bond- und Schweißverbindungen in der Halbleiterfertigung zeigen auf Grund des Betriebes unter hohen Anregungsniveaus nichtlineare Materialeigenschaften. Dabei wirken unterschiedliche Einflussfaktoren auf die elektrischen Eigenschaften und die mechanischen Übertragungscharakteristiken der Ultraschallsysteme ein. Die Herausforderungen ein solches geprägtes System auszulegen oder effizient und zuverlässig zu betreiben, sind aufgrund der Nichtlinearitäten relativ groß. Da für die Beschreibung der nichtlinearen Materialbeziehungen nur wenige Modelle und kaum quantitative Angaben vorliegen, werden die komplexen Wechselwirkungen von Materialparametern, Geometrie und Vorspannung des Schwingers, Betriebsgrößen (Strom, Spannung), Temperatur und Prozesslasten durch systematische Untersuchungen von Keramiken und Langevin-Schwingern messtechnisch erfasst. Aus den Messergebnissen werden einerseits eindimensionale Modelle für Voruntersuchungen als auch vollständige Materialparametersätze für die Simulation mittels dreidimensionaler FE-Modelle hergeleitet. Eine Methodik zur Ermittlung der Materialparameter und ein auf iterativen Simulationen von FE-Modellen basierendes Werkzeug zur Simulation der komplexen Wechselwirkungen werden vorgestellt. Anhand eines exemplarischen Ultraschallsystems wird gezeigt, dass die Wirkungen temperaturbedingter Vorspannungsverluste, Änderungen des elektrischen Klemmenverhaltens und Amplituden- und Frequenzänderungen während des Betriebes bei großen Amplituden und Prozesslasten durch die Variationen des Keramikvolumens und der Keramikposition positiv beeinflusst werden können. AU - Dymel, Collin ID - 52611 KW - Nichtlineares piezoelektrisches Verhalten KW - Dehnungsabhängigkeit KW - Vorspannungseinfluss KW - Temperatureinfluss KW - Lasteinfluss KW - Langevin-Schwinger KW - Ultraschallwandler KW - Ultraschallbonden KW - FEM-Modell KW - Ultraschallschweißen KW - BVD-Modell SN - 9783844093964 TI - Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten VL - 16 ER - TY - JOUR AB - Resistance spot‐welded joints containing press‐hardened steels are seen to exhibit a fracture mode called total dome failure, where the weld nugget completely separates from one steel sheet along the weld nugget edge. The effect of weld nugget shape and material property gradients is studied based on damage mechanics modeling and experimental validation to shed light on the underlying influencing factors. For a three‐steel‐sheet spot‐welded joint combining DP600 (1.5 mm)–CR1900T (1.0 mm)–CR1900T (1.0 mm), experiments under shear loading reveal that fracture occurs in the DP600 sheet along the weld nugget edge. In subsequent numerical simulation studies with damage mechanics models whose parameters are independently calibrated for every involved material configuration, three variations of the geometrical joint configuration are considered—an approximation of the real joint, one variation with a steeper weld nugget shape, and one variation with a less pronounced gradient between weld nugget material and heat‐affected zone material properties. The results of the finite‐element simulations show that a shallower weld nugget and a more pronounced material gradient lead to a faster increase of plastic strain at the edge of the weld nugget and promote the occurrence of total dome failure. AU - Schuster, Lilia AU - Olfert, Viktoria AU - Sherepenko, Oleksii AU - Fehrenbach, Clemens AU - Song, Shiyuan AU - Hein, David AU - Meschut, Gerson AU - Biro, Elliot AU - Münstermann, Sebastian ID - 50726 JF - steel research international KW - Materials Chemistry KW - Metals and Alloys KW - Physical and Theoretical Chemistry KW - Condensed Matter Physics SN - 1611-3683 TI - Influences of Weld Nugget Shape and Material Gradient on the Shear Strength of Resistance Spot‐Welded Joints ER - TY - CONF AB - In the context of language learning, feedback comment generation is the task of generating hints or explanatory notes for learner texts that help understand why a part of text is erroneous. This paper presents our approach to the Feedback Comment Generation Shared Task, collocated with the 16th International Natural Language Generation Conference (INLG 2023). The approach augments the generation of feedback comments by a self-supervised identification of feedback types in a multitask-learning setting. Within the shared task, other approaches performed more effective, yet the combined modeling of feedback type classification and feedback comment generation is superior to performing feedback generation only. AU - Stahl, Maja AU - Wachsmuth, Henning ID - 34083 T2 - Proceedings of the 16th International Natural Language Generation Conference TI - Identifying Feedback Types to Augment Feedback Comment Generation ER - TY - BOOK AB - Tax evasion, tax avoidance and tax resistance are widespread phenomena in political, economic, social and fiscal history from antiquity through medieval, early modern and modern times. Histories of Tax Evasion, Avoidance and Resistance shows how different groups and individuals around the globe have succeeded or failed in not paying their due taxes, whether in kind or in cash, on their properties or on their crops. It analyses how, throughout history, wealthy and poor taxpayers have tried to avoid or reduce their tax burden by negotiating with tax authorities, through practices of legal or illegal tax evasion, by filing lawsuits, seeking armed resistance or by migration, and how state authorities have dealt with such acts of claim making, defiance, open resistance or elusion. It fills an important research gap in tax history, addressing questions of tax morale and fairness, and how social and political inequality was negotiated through taxation. It gives rich insights into the development of citizen-state relationships throughout the course of history. The book comprises case studies from Ancient Athens, Roman Egypt, Medieval Europe, Early Modern Mexico, the Ottoman Empire, Nigeria under British colonial rule, the United Kingdom of the early 20th century, Greece during the Second World War, as well as West Germany, Switzerland, Sweden and the United States in the 20th century, including transnational entanglements in the world of late-modern offshore finance and taxation. The authors are experts in fiscal, economic, financial, legal, social and/or cultural history. The book is intended for students, researchers and scholars of economic and financial history, social and world history and political economy. The Open Access version of this book, available at www.taylorfrancis.com, has been made available under a Creative Commons Attribution-Share Alike 4.0 license. AU - Schönhärl, Korinna AU - Hürlimann, Gisela AU - Rohde, Dorothea ID - 34544 KW - Tax History KW - Financial History SN - 9781003333197 TI - Histories of Tax Evasion, Avoidance and Resistance ER - TY - CHAP AB - Jean Bodin's list on how the absolutist monarchical state could raise its revenue ranked taxation only in seventh place. From a modern legal perspective, taxes are compulsory transfers of resources that households and enterprises pay to one or several government bodies without receiving an individual, specific benefit in return. Historians have dealt with not paying taxes in various contexts, such as analysing tax resistance and tax resistance movements in history. Tax law is best understood as an outcome of long-term, often conflictual, negotiations and as an expression of specific political mentalities and ideologies. As a consequence, tax law and sometimes even the tax juridical system have a strongly politicised character. Loopholes in tax legislation that enable or facilitate avoidance or evasion can thus be regarded as a result of the interest-driven politics of parliamentary majorities, as the success of concerted lobby pressure. AU - Schönhärl, Korinna AU - Hürlimann, Gisela AU - Rohde, Dorothea ED - Schönhärl, Korinna ED - Hürlimann, Gisela ED - Rohde, Dorothea ID - 34546 T2 - Histories of Tax Evasion, Avoidance and Resistance TI - The Ability and Intention of Not Paying Taxes in History. Some Introductory Observations ER - TY - CHAP AB - As a case study, this chapter examines two tax education films that were produced 11 years apart in the USA and Western Germany during and after World War II: “The New Spirit” and “Putzke wants to know”. In contrast to America's most popular cartoon character 11 years earlier, Erwin Putzke is in a terrible mood at the beginning of the short film “Putzke wants to know”. The family father and electrician with a workshop of his own is annoyed and upset by the duty of filling in his tax return, grumbling at his wife and daughter and even at their budgie. The film's tax morale message is conveyed to its audience against the backdrop of a sober post-war reality characterised by allied occupation and the Allies' say in West German tax policies during a period of laborious economic build-up after a lost war. AU - Schönhärl, Korinna ED - Schönhärl, Korinna ED - Hürlimann, Gisela ED - Rohde, Dorothea ID - 34547 T2 - Histories of Tax Evasion, Avoidance and Resistance TI - How to Create a Taxpaying Spirit. A Transnational Examination of an US American and a Western German Tax Education Film in and after World War II ER - TY - CONF AU - Franke, Mario AU - Klingler, Florian AU - Sommer, Christoph ID - 34880 T2 - IEEE Consumer Communications and Networking Conference (CCNC 2023), Track Communication and Applications for Connected and Autonomous Vehicles on Land, Water, and Sky TI - Addressing the Unbounded Latency of Best-Effort Device-to-Device Communication with Low Earth Orbit Satellite Support ER - TY - CONF AU - Hegde, Anupama AU - Delooz, Quentin AU - Mariyaklla, Chethan Lokesh AU - Festag, Andreas AU - Klingler, Florian ID - 34879 T2 - IEEE Wireless Communications and Networking Conference (WCNC 2023), Track Emerging Technologies, Standards, and Applications TI - Radio Resource Allocation for Collective Perception in 5G-NR Vehicle-to-X Communication Systems ER - TY - CONF AU - Hardes, Tobias AU - Klingler, Florian AU - Sommer, Christoph ID - 34878 T2 - IEEE Wireless Communications and Networking Conference (WCNC 2023), Track Emerging Technologies, Standards, and Applications TI - Improving Platooning Safety with Full Duplex Relaying and Beamforming ER - TY - CHAP AU - Süßmann, Johannes ED - Drobner, Hubertus R. ED - Stork, Hans-Walter ID - 34973 T2 - Bücher in Westfalen – Westfalen und ihre Bücher. Festschrift für Hermann-Josef Schmalor zum 70. Geburtstag TI - Bibliotheken des Hellwegraums als Orte frühneuzeitlichen Kulturtransfers. Aufriß und Forschungsprogramm ER - TY - CONF AU - Dann, Andreas Peter AU - Hermann, Ben AU - Bodden, Eric ID - 35083 TI - UpCy: Safely Updating Outdated Dependencies ER - TY - GEN AU - Famula, Marta ID - 33938 T2 - Jahrbuch Forum Vormärz Forschung 2022. [in Vorbereitung] TI - Antonia Villinger: Dramen der Schwangerschaft. Friedrich Hebbels „Judith“, „Maria Magdalena“ und „Genoveva“. Baden-Baden: Ergon 2021 ER -