TY - CONF AU - Anthony, Christopher J. AU - Yost, M AU - Howe, A AU - Schwab, Susanne AU - Hassani, Sepideh AU - Hellmich, Frank AU - Löper, Marwin Felix AU - Görel, Gamze ID - 44169 TI - Examining the Measurement Invariance and Convergent Validity of the SSIS-SELb-Student in Austria and Germany. 44th Annual Conference of the International School Psychology Association (ISPA) 2023. ER - TY - GEN AU - Schmelzle, Lars AU - Mergheim, Julia AU - Possart, Gunnar AU - Striewe, Marius AU - Meschut, Gerson ID - 44182 T2 - 23. Kolloquium: Gemeinsame Forschung in der Klebtechnik TI - Experimentelle und numerische Untersuchung des Einflusses variabler Betriebstemperaturen auf das Trag- und Versagensverhalten struktureller Klebverbindungen unter Crashbelastung ER - TY - CONF AB - Abstract. In order to reduce global energy consumption in production and industry along with the associated CO2 emissions, existing resources must be used more efficiently. This includes the energy-efficient and comprehensive recycling of a wide range of metals. Especially for the production of aluminium, there is a large potential for saving energy using efficient recycling processes. With regard to the recycling of aluminium studies have shown that solid-state recycling processes are significantly more efficient considering the used energy and resources compared to the conventional, smelting-metallurgical recycling process. In this paper, the direct and energy-efficient friction-induced recycling process (FIRP) based on the conform process is further described and analysed in terms of the temperature-property relationships. For this purpose, the influence of the processing temperature on the microstructure and properties of the recycled semi-finished products is investigated using the toll system that enables an ECAP forming. Specific sections of the (in theory) infinite, recycled semi-finished product are taken and analysed at different process temperatures of the solid state recycling process. Based on these sections, the properties in terms of mechanical hardness, strength, ductility and grain size are analysed and a degressive relationship between process temperature and mechanical hardness up to a temperature of 270 °C can be shown. Applying the Hall-Petch relationship, it is analysed whether there is a correlation between the strength and the microstructure in the form of the grain size. AU - Borgert, Thomas AU - Homberg, Werner ID - 44036 KW - Recycling KW - Aluminium KW - Friction-Induced KW - Energy Efficiency SN - 2474-395X T2 - Materials Research Proceedings TI - Analysis of temperature effect on strength and microstructure in friction induced recycling process (FIRP) ER - TY - CHAP AU - Mildorf, Jarmila AU - Ketteler, Daniel ED - Mildorf, Jarmila ED - Punzi, Elisabeth ED - Singer, Christoph ID - 37519 SN - 9780197620540 T2 - Narrative and Mental Health Today: Reimagining Theory and Practice TI - Writing as Narrative Resource in Therapeutic Settings: Diaries, Sketches, Notes ER - TY - BOOK ED - Mildorf, Jarmila ED - Punzi, Elisabeth ED - Singer, Christoph ID - 37518 SN - 9780197620540 TI - Narrative and Mental Health: Reimagining Theory and Practice ER - TY - JOUR AB - In der zukünftigen Produktion werden der Aufbau und die Entwicklung der Fähigkeiten der Mitarbeiter:innen ein entscheidender Wettbewerbsvorteil von Unternehmen. In menschenzentrierten Montagesystemen passen sich die Mitarbeiter:innen auf der Grundlage von Lernprozessen an neue und sich ändernde Aufgaben an. Dazu muss der Bezug zu den Fähigkeiten der Mitarbeiter:innen im Zuge der integrierten Produkt-und Prozessentwicklung vorgesehen werden. Daher wurde eine Methodik entwickelt, die diese Fähigkeiten explizit abbildet und sie sowohl in der Entwicklung als auch in der kurzfristigen Personaleinsatzplanung bei der Aufgabenzuordnung berücksichtigt. Zur Anwendung wurde die Methodik prototypisch in einem Software-Werkzeug umgesetzt und in Kombination mit einer diskreten ereignisorientierten Simulation erprobt. AU - Gräßler, Iris AU - Roesmann, Daniel AU - Pottebaum, Jens ID - 44215 IS - 3 JF - Zeitschrift für wirtschaftlichen Fabrikbetrieb KW - Management Science and Operations Research KW - Strategy and Management KW - General Engineering SN - 2511-0896 TI - Human Factors in der integrierten Produktentwicklung VL - 118 ER - TY - JOUR AB - Die Wirtschaftlichkeit von Wärmemotoren wird maßgeblich durch die Rückführung von Wärme in Rekuperatoren beeinflusst. Beim isobaren Expansionsmotor vom Bush-Typ, einem Wärmemotor, welcher bereits mit Wärmequellen ab 60°C betrieben werden kann, steigt der thermische Wirkungsgrad durch den Einsatz von Rekuperatoren signifikant. Gleichzeitig wirken sich das Fluidvolumen des Wärmeübertragers sowie der beim Betrieb auftretende Druckverlust negativ auf den thermischen Wirkungsrad aus. In dieser Arbeit wird der Zusammenhang von Totvolumen, Druckverlust und Wärmerückgewinnung untersucht und Empfehlungen für den Betrieb von Rekuperatoren am isobaren Expansionsmotor gegeben. AU - Mügge, Nils AU - Kronberg, Alexander AU - Glushenkov, Maxim AU - Kenig, Eugeny Y. ID - 42252 IS - 5 JF - Chemie Ingenieur Technik KW - Isobarer Expansionsmotor KW - Dynamische Wärmeübertragungsmodellierung KW - Phasenwechsel KW - dichte Arbeitsmedien TI - Untersuchung überlagerter Effekte von Druckverlust und Totvolumen durch Rekuperation am isobaren Expansionsmotor VL - 95 ER - TY - CHAP AU - Mildorf, Jarmila AU - Punzi, Elisabeth AU - Singer, Christoph ED - Mildorf, Jarmila ED - Punzi, Elisabeth ED - Singer, Christoph ID - 44217 SN - 978-0-19-762054-0 T2 - Narrative and Mental Health: Reimagining Theory and Practice TI - Narratives and Mental Health: An Introduction ER - TY - JOUR AU - Schmolke, Tobias AU - Teutenberg, Dominik AU - Meschut, Gerson ID - 43130 JF - The Journal of Adhesion TI - Investigation of the leak tightness of structural adhesive joints for use in battery housings considering mechanical and corrosive loads ER - TY - JOUR AU - Köring, Laura AU - Stepen, Arne AU - Birenheide, Bernhard AU - Barth, Simon AU - Leskov, Maxim AU - Schoch, Roland AU - Krämer, Felix AU - Breher, Frank AU - Paradies, Jan ID - 42878 JF - Angewandte Chemie International Edition KW - General Chemistry KW - Catalysis SN - 1433-7851 TI - Boron‐Centered Lewis Superacid through Redox‐Active Ligands: Application in C−F and S−F Bond Activation ER - TY - JOUR AU - Köring, Laura AU - Stepen, Arne AU - Birenheide, Bernhard AU - Barth, Simon AU - Leskov, Maxim AU - Schoch, Roland AU - Krämer, Felix AU - Breher, Frank AU - Paradies, Jan ID - 42879 JF - Angewandte Chemie KW - General Medicine SN - 0044-8249 TI - Boron‐Centered Lewis Superacid through Redox‐Active Ligands: Application in C−F and S−F Bond Activation ER - TY - CONF AU - Göddecke, Johannes AU - Meschut, Gerson ID - 42877 TI - Damping Properties of Bonded Structures Under Dynamic Loading ER - TY - JOUR AU - Cara, Eleonora AU - Hönicke, Philipp AU - Kayser, Yves AU - Lindner, Jörg K. N. AU - Castellino, Micaela AU - Murataj, Irdi AU - Porro, Samuele AU - Angelini, Angelo AU - De Leo, Natascia AU - Pirri, Candido Fabrizio AU - Beckhoff, Burkhard AU - Boarino, Luca AU - Ferrarese Lupi, Federico ID - 42953 IS - 3 JF - ACS Applied Polymer Materials KW - Organic Chemistry KW - Polymers and Plastics KW - Process Chemistry and Technology SN - 2637-6105 TI - Developing Quantitative Nondestructive Characterization of Nanomaterials: A Case Study on Sequential Infiltration Synthesis of Block Copolymers VL - 5 ER - TY - JOUR AB - AbstractThe use of structured measuring systems to prevent wall slip is a common approach to obtain absolute rheological values. Typically, only the minimum distance between the measuring surfaces is used for further calculation, implying that no flow occurs between the structural elements. But this assumption is misleading, and a gap correction is necessary. To determine the radius correction $$\Delta r$$ Δ r for specific geometries, we conducted investigations on three Newtonian fluids (two silicon oils and one suspension considered to be Newtonian in the relevant shear rate range). The results show that $$\Delta r$$ Δ r is not only shear- and material-independent, but geometry-dependent, providing a Newtonian flow behaviour in a similar viscosity range. Therefore, a correction value can be determined with only minute deviations in different Newtonian fluids. As the conducted laboratory measurements are very time-consuming and expensive, a CFD-approach with only very small deviations was additionally developed and compared for validation purposes. Therefore, simulation is an effective and resource-efficient alternative to the presented laboratory measurements to determine $$\Delta r$$ Δ r for the correction of structured coaxial geometries even for non-Newtonian fluids in the future. AU - Josch, Sebastian AU - Jesinghausen, Steffen AU - Dechert, Christopher AU - Schmid, Hans-Joachim ID - 36983 JF - Rheologica Acta KW - rheology KW - rheometry KW - suspension KW - coaxial KW - correction SN - 0035-4511 TI - Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems ER - TY - BOOK AU - Allmer, Thomas ID - 42938 TI - Universities and Academic Labour in Times of Precarisation and Digitalisation ER - TY - CONF AB - We present an approach for guaranteed constraint satisfaction by means of data-based optimal control, where the model is unknown and has to be obtained from measurement data. To this end, we utilize the Koopman framework and an eDMD-based bilinear surrogate modeling approach for control systems to show an error bound on predicted observables, i.e., functions of the state. This result is then applied to the constraints of the optimal control problem to show that satisfaction of tightened constraints in the purely data-based surrogate model implies constraint satisfaction for the original system. AU - Schaller, Manuel AU - Worthmann, Karl AU - Philipp, Friedrich AU - Peitz, Sebastian AU - Nüske, Feliks ID - 30125 IS - 1 T2 - IFAC-PapersOnLine TI - Towards reliable data-based optimal and predictive control using extended DMD VL - 56 ER - TY - JOUR AU - Hetkämper, Tim AU - Koch, Kevin AU - Claes, Leander AU - Henning, Bernd ID - 37543 IS - 2 JF - tm - Technisches Messen KW - Schlierentechnik TI - Phase-preserving methods to visualise ultrasonic fields with schlieren imaging VL - 90 ER - TY - JOUR AU - Greil, Stefan AU - Overesch, Michael AU - Rohlfing-Bastian, Anna AU - Schreiber, Ulrich AU - Sureth-Sloane, Caren ID - 42635 IS - 4 JF - Intertax TI - Towards an Amended Arm´s Length Principle - Tackling Complexity and Implementing Destination Rules in Transfer Pricing VL - 51 ER - TY - CONF AB - We demonstrate the numerical and experimental realization of optimized optical traveling-wave antennas made of low-loss dielectric materials. These antennas exhibit highly directive radiation patterns and our studies reveal that this nature comes from two dominant guided TE modes excited in the waveguide-like director of the antenna, in addition to the leaky modes. The optimized antennas possess a broadband nature and have a nearunity radiation efficiency at an operational wavelength of 780 nm. Compared to the previously studied plasmonic antennas for photon emission, our all-dielectric approach demonstrates a new class of highly directional, low-loss, and broadband optical antennas. AU - Farheen, Henna AU - Yan, Lok-Yee AU - Leuteritz, Till AU - Qiao, Siqi AU - Spreyer, Florian AU - Schlickriede, Christian AU - Quiring, Viktor AU - Eigner, Christof AU - Silberhorn, Christine AU - Zentgraf, Thomas AU - Linden, Stefan AU - Myroshnychenko, Viktor AU - Förstner, Jens ED - García-Blanco, Sonia M. ED - Cheben, Pavel ID - 43051 KW - tet_topic_opticalantenna T2 - Integrated Optics: Devices, Materials, and Technologies XXVII TI - Tailoring the directive nature of optical waveguide antennas ER - TY - CONF AB - We demonstrate a large-scale two dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing desired radiation patterns in the far-field. The OPAs are numerically optimized to have an upward efficiency of up to 90%, targeting radiation concentration mainly in the field of view. We envision that our OPAs have the ability of generating complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation and augmented-reality displays. AU - Farheen, Henna AU - Strauch, Andreas AU - Scheytt, J. Christoph AU - Myroshnychenko, Viktor AU - Förstner, Jens ED - García-Blanco, Sonia M. ED - Cheben, Pavel ID - 43052 KW - tet_topic_opticalantenna T2 - Integrated Optics: Devices, Materials, and Technologies XXVII TI - Optimized silicon antennas for optical phased arrays ER - TY - JOUR AB - AU - Heck, Tamara AU - Steinhardt, Isabel AU - Rahal, Rima-Maria AU - Schubotz, Moritz AU - Scholl, Dominik AU - Behrens, Sarah ID - 43094 JF - Research Ideas and Outcomes KW - Open Science SN - 2367-7163 TI - Bootstrapping the Open Science culture: The fellowship approach VL - 9 ER - TY - JOUR AU - Black, Tobias AU - Fuest, Mario AU - Lankeit, Johannes AU - Mizukami, Masaaki ID - 43105 JF - Nonlinear Analysis: Real World Applications KW - Applied Mathematics KW - Computational Mathematics KW - General Economics KW - Econometrics and Finance KW - General Engineering KW - General Medicine KW - Analysis SN - 1468-1218 TI - Possible points of blow-up in chemotaxis systems with spatially heterogeneous logistic source VL - 73 ER - TY - JOUR AU - Wippermann, Jan AU - Meschut, Gerson AU - Koshukow, Wikentij AU - Liebsch, Alexander AU - Gude, Maik AU - Minch, Steven AU - Kolbe, Björn ID - 43154 JF - Welding in the World KW - Metals and Alloys KW - Mechanical Engineering KW - Mechanics of Materials SN - 0043-2288 TI - Correction: Thermal influence of resistance spot welding on a nearby overmolded thermoplastic–metal joint ER - TY - CONF AU - Görel, Gamze AU - Hellmich, Frank AU - Löper, Marwin Felix ID - 43177 TI - Förderung der sozialen Partizipation von Kindern im inklusiven Unterricht. Workshop auf dem 9. Paderborner Grundschultag. Thema: „Demokratie von Anfang an! Demokratie in der Grundschule erfahren, mitgestalten und reflektieren“ ER - TY - CHAP AU - Vitt, Vivian AU - Häsel-Weide, Uta ID - 43227 T2 - Mathematica Didactica, 46 TI - Reziprokes Peer-Tutoring zur Förderung von Schüler*innen mit Schwierigkeiten beim Mathematiklernen. ER - TY - CHAP AU - Häsel-Weide, Uta AU - Nührenbörger, M. ID - 43226 T2 - Mathematica Didactica, 46 TI - Inklusive Praktiken unterrichtsintegrierter Förderung im Mathematikunterricht. ER - TY - GEN AU - Rüther, Torben AU - Schmid, Hans-Joachim ID - 43236 KW - CDMA TI - CDMA: Centrifugal Differential Mobility Analyzer - Ein Messprinzip zur Bestimmung von Multidimensionalen Partikeleigenschaften (Vortrag) ER - TY - JOUR AU - Schroeter-Wittke, Harald ID - 43248 IS - 1 JF - Zeitschrift für Pädagogik und Theologie SN - 1437-7160 TI - Thorsten Knauth/Rainer Möller/Annebelle Pithan (Hg.), Inklusive Religionspädagogik der Vielfalt. Konzeptionelle Grundlagen und didaktische Konkretionen. Münster/New York 2020 VL - 75 ER - TY - GEN AU - Lutters, Nicole AU - Buckmann, Felix AU - Kenig, Eugeny Y. ID - 43280 TI - Zur experimentellen Untersuchung der Reinstoffkondensation in Kissenplatten-Wärmeübertragern ER - TY - JOUR AB - Laser structuring to improve the adhesion properties of steel substrates in fiber-metal laminates offers many advantages that are highly suitable for modern industrial requirements. Maintenance and energy costs are relatively low, it is easy to automate, and there are no by-products such as chemicals or abrasives to dispose of or recycle. This makes laser structuring a particularly environmentally friendly process, which is nowadays more important than ever. On the other hand, the process time for laser structuring is much higher than for chemical pre-treatment, for example. In past studies, the time and cost efficiency of the laser structuring process has tended to play a minor role. However, there are approaches in which laser structured surfaces are adapted to the shear stress peaks occurring within the adhesive layer, thus requiring only partial structuring of the area to be bonded, potentially saving process time. In this experimental study, electrolytically galvanized steel substrates were partially laser structured to match the shear stress distribution and then bonded to a carbon fiber-reinforced plastic. The adhesion properties achieved were characterized using shear tensile tests and compared with the properties of the fully structured ones. With the partial laser structuring, a saving of 66 % of the conventional process time was achieved while maintaining 95 % of the same shear strength. AU - Voswinkel, Dietrich ID - 43371 JF - Journal of Manufacturing Processes KW - Laser treatment Adhesive bonding Surface technology Hybrid materials TI - Application of a new strategy for time-efficient laser treatment of galvanized steel substrates to improve the adhesion properties VL - 94 ER - TY - GEN ED - Meine, Sabine ED - Otto, Arnold ED - Süßmann, Johannes ID - 35062 SN - 978-3-8260-7218-5 TI - Musiklandschaften zwischen Rhein und Weser. Pluralisierung und Verflechtung entlang des Hellwegs in der Frühen Neuzeit. Unter Mitarbeit v. Markus Lauert VL - 13 ER - TY - CONF AU - Bernemann, Sören Antonius AU - Maćkowiak, Jan AU - Maćkowiak, Jerzy AU - Kenig, Eugeny ID - 43393 TI - Computerunterstützte Strömungsuntersuchung von landwirtschaftlichen Abfällen ER - TY - CONF AU - Trentinaglia, Roman AU - Merschjohann, Sven AU - Fockel, Markus AU - Eikerling, Hendrik ID - 43395 SN - 0302-9743 T2 - REFSQ 2023: Requirements Engineering: Foundation for Software Quality TI - Eliciting Security Requirements – An Experience Report ER - TY - JOUR AU - Hanusch, Maximilian ID - 34832 IS - 21 JF - Annals of Global Analysis and Geometry KW - Lax equation KW - generalized Baker-Campbell-Dynkin-Hausdorff formula KW - regularity of Lie groups TI - The Lax Equation and Weak Regularity of Asymptotic Estimate Lie Groups VL - 63 ER - TY - CHAP AU - Grydin, Olexandr AU - Garthe, Kai-Uwe AU - Yuan, Xueyang AU - Broer, Jette AU - Keßler, Olaf AU - Králík, Rostislav AU - Cieslar, Miroslav AU - Schaper, Mirko ED - Broek, Stephan ID - 41959 SN - 2367-1181 T2 - Light Metals 2023 TI - Numerical and Experimental Investigation of Twin-Roll Casting of Aluminum–Lithium Strips ER - TY - GEN AU - Ghazal, Abdulkarim AU - Sadeghi-Kohan, Somayeh AU - Reimer, Jan Dennis AU - Hellebrand, Sybille ID - 35204 KW - WORKSHOP TI - On Cryptography Effects on Interconnect Reliability ER - TY - JOUR AU - Brosch, Anian AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 43456 JF - IEEE Transactions on Power Electronics KW - Electrical and Electronic Engineering SN - 0885-8993 TI - Time-Optimal Model Predictive Control of Permanent Magnet Synchronous Motors Considering Current and Torque Constraints ER - TY - CHAP AU - Strauß, Sara ED - Mildorf, Jarmila ED - Punzi, Eilsabeth ED - Singer, Christoph ID - 43459 SN - 9780197620540 T2 - Narrative and Mental Health TI - Narrative Experiments with Medical Categorization and Normalization in B. S. Johnson's House Mother Normal ER - TY - GEN AU - Dechert, Christopher AU - Kengni Nkouemou, Augustin AU - Kenig, Eugeny Y. ID - 43111 TI - Vergleichende Untersuchung der Wirkung verschiedener Mikrostrukturen auf die Flüssigkeitsausbreitung ER - TY - JOUR AB - High-contrast slab waveguide Bragg gratings with 1D periodicity are investigated. For specific oblique excitation by semi-guided waves at sufficiently high angles of incidence, the idealized structures do not exhibit any radiative losses, such that reflectance and transmittance for the single port mode add strictly up to one. We consider a series of symmetric, fully and partly etched finite gratings, for parameters found in integrated silicon photonics. These can act as spectral filters with a reasonably flattop response. Apodization can lead to more box shaped reflectance and transmittance spectra. Together with a narrowband Fabry–Perot filter, these configurations are characterized by reflection bands, or transmittance peaks, with widths that span three orders of magnitude. AU - Hammer, Manfred AU - Farheen, Henna AU - Förstner, Jens ID - 43245 IS - 4 JF - Journal of the Optical Society of America B KW - tet_topic_waveguide SN - 0740-3224 TI - How to suppress radiative losses in high-contrast integrated Bragg gratings VL - 40 ER - TY - JOUR AU - Serino, Laura AU - Gil López, Jano AU - Stefszky, Michael AU - Ricken, Raimund AU - Eigner, Christof AU - Brecht, Benjamin AU - Silberhorn, Christine ID - 44081 IS - 2 JF - PRX Quantum KW - General Physics and Astronomy KW - Mathematical Physics KW - Applied Mathematics KW - Electronic KW - Optical and Magnetic Materials KW - Electrical and Electronic Engineering KW - General Computer Science SN - 2691-3399 TI - Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States VL - 4 ER - TY - BOOK AU - Ribbat, Christoph ID - 44080 TI - Breathing in Manhattan: Carola Speads - The German Jewish Gymnastics Instructor Who Brought Mindfulness to America ER - TY - CONF AB - The nonlinear optical response of quantum well excitons is investigated experimentally using polarization resolved four wave mixing, optical-pump optical-probe, and optical-pump Terahertz-probe spectroscopy. The four-wave mixing data reveal clear signatures of coherent biexcitons which concur with straight-forward polarization selection rules at the Γ point. The type-I samples show the well-established time-domain beating signatures in the transients as well as the corresponding spectral signatures clearly. The latter are also present in type-II samples; however, the smaller exciton and biexciton binding energies in these structures infer longer beating times which, in turn, are accompanied by faster dephasing of the type-II exciton coherences. Furthermore, the THz absorption following spectrally narrow, picosecond excitation at energies in the vicinity of the 1s exciton resonance are discussed. Here, the optical signatures yield the well-established redshifts and blueshifts for the appropriate polarization geometries in type-I quantum well samples also termed “AC Stark Effect”. The THz probe reveals intriguing spectral features which can be ascribed to coherent negative absorption following an excitation into a virtual state for an excitation below the 1s exciton resonance. Furthermore, the scattering and ionization of excitons is discussed for several excitation geometries yielding control rules for elastic and inelastic quasiparticle collisions. AU - Meier, Torsten AU - Stein, M. AU - Schäfer, F. AU - Anders, D. AU - Littmann, J. H. AU - Fey, M. AU - Trautmann, Alexander AU - Ngo, C. AU - Steiner, J. T. AU - Reichelt, Matthias AU - Fuchs, C. AU - Volz, K. AU - Chatterjee, S. ID - 43189 T2 - Ultrafast Phenomena and Nanophotonics XXVII TI - Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields VL - 12419 ER - TY - CONF AB - Anomalous currents refer to electronic currents that flow perpendicularly to the direction of the accelerating electric field. Such anomalous currents can be generated when Terahertz fields are applied after an optical interband excitation of GaAs quantum wells. The underlying processes are investigated by numerical solutions of the semiconductor Bloch equations in the length gauge. Excitonic effects are included by treating the manybody Coulomb interaction in time-dependent Hartree-Fock approximation and additionally also carrier-phonon scattering processes are considered. The band structure and matrix elements are obtained from a 14-band k · p model within the envelope function approximation. The random phase factors of the matrix elements that appear due to the separate numerical diagonalization at each k-point are treated by applying a smooth gauge transformation. We present the macroscopic Berry curvature and anomalous current transients with and without excitonic effects. It is demonstrated that the resonant optical excitation of excitonic resonances can significantly enhance the Berry curvature and the anomalous currents. AU - Meier, Torsten AU - Ngo, C. AU - Priyadarshi, S. AU - Duc, H. T. AU - Bieler, M. ID - 43191 T2 - Ultrafast Phenomena and Nanophotonics XXVII TI - Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells VL - 12419 ER - TY - CONF AB - The nonlinear optical response of quantum well excitons excited by optical fields is analyzed by numerical solutions of the semiconductor Bloch equations. Differential absorption spectra are computed for resonant pumping at the exciton resonance and the dependence of the absorption changes on the polarization directions of the pump and probe pulses is investigated. Coherent biexcitonic many-body correlations are included in our approach up to third-order in the optical fields. Results are presented for spatially-direct type-I and spatiallyindirect type-II quantum well systems. Due to the spatial inhomogeneity, in type-II structures a finite coupling between excitons of opposite spins exists already on the Hartree-Fock level and contributes to the absorption changes for the case of opposite circularly polarized pump and probe pulses. AU - Meier, Torsten AU - Trautmann, Alexander AU - Stein, M. AU - Schäfer, F. AU - Anders, D. AU - Ngo, C. AU - Steiner, J. T. AU - Reichelt, Matthias AU - Chatterjee, S. ID - 43190 T2 - Ultrafast Phenomena and Nanophotonics XXVII TI - Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations VL - 12419 ER - TY - JOUR AU - Meier, Torsten AU - Schäfer, F. AU - Stein, M. AU - Lorenz, J. AU - Dobener, F. AU - Ngo, C. AU - Steiner, J. T. AU - Fuchs, C. AU - Stolz, W. AU - Volz, K. AU - Hader, J. AU - Moloney, J.V. AU - Koch, S.W. AU - Chatterjee, S. ID - 43139 IS - 8 JF - Applied Physics Letters TI - Gain recovery dynamics in active type-II semiconductor heterostructures VL - 122 ER - TY - GEN AU - Meier, Torsten AU - Grisard, S. AU - Trifonov, A.V. AU - Rose, Hendrik AU - Reichhardt, R. AU - Reichelt, Matthias AU - Schneider, C. AU - Kamp, M. AU - Höfling, S. AU - Bayer, M. AU - Akimov, I.A ID - 43132 T2 - arxiv:2302.02480 TI - Temporal sorting of optical multi-wave-mixing processes in semiconductor quantum dots ER - TY - JOUR AU - Sperling, Jan AU - Agudelo, Elizabeth ID - 44050 IS - 4 JF - Physical Review A SN - 2469-9926 TI - Entanglement of particles versus entanglement of fields: Independent quantum resources VL - 107 ER - TY - JOUR AU - Sperling, Jan AU - Gianani, Ilaria AU - Barbieri, Marco AU - Agudelo, Elizabeth ID - 40477 IS - 1 JF - Physical Review A SN - 2469-9926 TI - Detector entanglement: Quasidistributions for Bell-state measurements VL - 107 ER - TY - JOUR AU - Lüders, Carolin AU - Pukrop, Matthias AU - Barkhausen, Franziska AU - Rozas, Elena AU - Schneider, Christian AU - Höfling, Sven AU - Sperling, Jan AU - Schumacher, Stefan AU - Aßmann, Marc ID - 42973 IS - 11 JF - Physical Review Letters KW - General Physics and Astronomy SN - 0031-9007 TI - Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography VL - 130 ER - TY - JOUR AB - We study how competition between physicians affects the provision of medical care. In our theoretical model, physicians are faced with a heterogeneous patient population, in which patients systematically vary with regard to both their responsiveness to the provided quality of care and their state of health. We test the behavioral predictions derived from this model in a controlled laboratory experiment. In line with the model, we observe that competition significantly improves patient benefits as long as patients are able to respond to the quality provided. For those patients, who are not able to choose a physician, competition even decreases the patient benefit compared to a situation without competition. This decrease is in contrast to our theoretical prediction implying no change in benefits for passive patients. Deviations from patient-optimal treatment are highest for passive patients in need of a low quantity of medical services. With repetition, both, the positive effects of competition for active patients as well as the negative effects of competition for passive patients become more pronounced. Our results imply that competition can not only improve but also worsen patient outcome and that patients’ responsiveness to quality is decisive. AU - Brosig-Koch, Jeannette AU - Hehenkamp, Burkhard AU - Kokot, Johanna ID - 44092 JF - Health Economics KW - physician competition KW - patient characteristics KW - heterogeneity in quality responses KW - fee-for-service KW - laboratory experiment TI - Who benefits from quality competition in health care? A theory and a laboratory experiment on the relevance of patient characteristics ER - TY - GEN AB - We consider a model where for-profit providers compete in quality in a price-regulated market that has been opened to competition, and where the incumbent is located at the center of the market, facing high costs of relocation. The model is relevant in markets such as public health care, education and schooling, or postal services. We find that, when the regulated price is low or intermediate, the entrant strategically locates towards the corner of the market to keep the incumbent at the low monopoly quality level. For a high price, the entrant locates at the corner of the market and both providers implement higher quality compared to a monopoly. In any case, the entrant implements higher quality than the incumbent provider. Social welfare is always higher in a duopoly if the cost of quality is low. For higher cost levels welfare is non-monotonic in the price and it can be optimal to the regulator not to use its entire budget. Therefore, the welfare effect of entry depends on the price and the size of the entry cost, and the regulator should condition the decision to allow entry on an assessment of the entry cost. AU - Hehenkamp, Burkhard AU - Kaarbøe, Oddvar M. ID - 44093 KW - Quality competition KW - Price regulation KW - Location choice KW - Product differentiation TI - Price Regulation, Quality Competition and Location Choice with Costly Relocation ER - TY - JOUR AB - We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as ηmax ≈ 2.8 × 10−7 a peak power intensity of 1.2 GW cm−2 is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications. AU - Hähnel, David AU - Golla, Christian AU - Albert, Maximilian AU - Zentgraf, Thomas AU - Myroshnychenko, Viktor AU - Förstner, Jens AU - Meier, Cedrik ID - 44097 IS - 1 JF - Light: Science & Applications KW - tet_topic_meta SN - 2047-7538 TI - A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces VL - 12 ER - TY - JOUR AU - Maack, Marten ID - 44077 IS - 3 JF - Operations Research Letters KW - Applied Mathematics KW - Industrial and Manufacturing Engineering KW - Management Science and Operations Research KW - Software SN - 0167-6377 TI - Online load balancing on uniform machines with limited migration VL - 51 ER - TY - GEN AU - Mamedov, Tural AU - Schleicher, Eckhard AU - Schubert, Markus AU - Ehlert, Thomas AU - Kenig, Eugeny Y. AU - Hampel, Uwe ID - 44096 TI - Experimental analysis of ship motion effects on the performance of an absorption column equipped with structured packings ER - TY - GEN AU - Ehlert, Thomas AU - Mamedov, Tural AU - Schubert, Markus AU - Kenig, Eugeny Y. ID - 44094 TI - Charakterisierung des Einflusses neigungsinduzierter Strömungsformen mit dem Ansatz der hydrodynamsichen Analogie ER - TY - GEN AU - Ehlert, Thomas AU - Lutters, Nicole AU - Kenig, Eugeny Y. ID - 44095 TI - Modellierung des Randspalts in Strukturpackungskolonnen mit dem Ansatz der hydrodynamischen Analogien ER - TY - JOUR AU - Jende, Yvonne Kristin ID - 44137 JF - Zeitschrift für Kanada-Studien SN - 0944-7008 TI - "The Future of Canadian Studies: On Plowing a Lonely Furrow." VL - 43 ER - TY - BOOK AU - Bauer, Anna Brigitte ID - 44083 SN - 978-3-8325-5625-9 TI - Experimentelle Kompetenz Physikstudierender. Entwicklung und erste Erprobung eines performanzorientierten Kompetenzstrukturmodells unter Nutzung qualitativer Methoden VL - 352 ER - TY - GEN AU - Beule, Felix AU - Schmelzle, Lars AU - Teutenberg, Dominik AU - Possart, Gunnar AU - Meschut, Gerson AU - Mergheim, Julia ID - 44181 T2 - 23. Kolloquium: Gemeinsame Forschung in der Klebtechnik TI - Methodenentwicklung zur Simulation von hyperelastischen Klebverbindungen unter Crashbelastung ER - TY - GEN AU - Schürmann, Patrick ID - 43374 TI - A Formal Comparison of Advanced Digital Signature Primitives ER - TY - CONF AU - Kowatz, Jannik AU - Teutenberg, Dominik AU - Meschut, Gerson ID - 44183 T2 - 23. Kolloquium Gemeinsame Forschung in der Klebtechnik TI - Weiterentwicklung der induktiven Schnellhärtung von Klebverbindungen für robuste Fertigungsprozesse unter Berücksichtigung von serienrelevanten Einflussfaktoren ER - TY - JOUR AB - Microcellular wood fiber reinforced polymers offer the possibility to reduce the use of fossil raw materials. In particular, thick-walled structures with thicknesses greater than 6 mm offer a high potential for weight savings. This study investigates the cell structures and mechanical properties of injection-molded test specimens. The influence of different thicknesses (6–10 mm) along with different chemical blowing agents (endothermic, exothermic) with varying dosages (0–2 wt%) is analyzed. The investigations reveal that exothermic chemical blowing agents form finer cells consistently to thin-walled structures than endothermic ones. Higher foaming agent content leads to higher pore fractions, with many small cells coalescing into a large open-pore cell network. The mechanical properties depend mainly on the pore content of the sample. The specific tensile properties deteriorate with the use of chemical blowing agents (CFA), whereas the sandwich structure produced with compact edge layers has a positive influence on the specific flexural properties. AU - Moritzer, Elmar AU - Flachmann, Felix ID - 42515 IS - 3 JF - Journal of Cellular Plastics KW - Materials Chemistry KW - Polymers and Plastics KW - General Chemistry SN - 0021-955X TI - Morphological and mechanical properties of foamed thick-walled Wood-Plastic-Composite structures VL - 59 ER - TY - JOUR AU - Burmeister, Sascha Christian AU - Schryen, Guido ID - 42179 JF - Energy Systems TI - Distribution Network Optimization: Predicting computation times to design scenario analysis for network operators ER - TY - CONF AB - Abstract. Friction-spinning as an innovative incremental forming process enables large degrees of deformation in tube and sheet metal-forming due to a self-induced heat generation in the forming zone. This paper presents new process designs for energy and resource-efficient forming of gas cylinders by friction-spinning without the use of an external heat supply. The self-generated heat enables friction-spinning process to reduce the energy demand in the manufacture of gas cylinders, which are usually manufactured with external heat (mostly fossil fuels), by 95 %. Typical gas cylinder contours, such as flattened and spherical bottom ends and cylinder necks, are manufactured by friction-spinning of AW 6060 tubular profiles with specifically designed tool path strategies. It is shown that friction-spinning enables the manufacture of typical gas cylinder contours with sufficient wall thickness and the required gas tightness without the input of external heat. Thus, this process can contribute to an increase in the energy and resource efficiency of forming processes. AU - Dahms, Frederik AU - Homberg, Werner ID - 44035 SN - 2474-395X T2 - Materials Research Proceedings TI - Energy and Resource-efficient Forming of Gas Cylinders by Friction-Spinning ER - TY - JOUR AB - The technical importance of paraffins as phase change materials (PCM) in heat storage systems increases. Knowledge on the thermal conductivity of paraffins is necessary for the design and optimization of heat storage systems. However, for most paraffins solely the thermal conductivity of the liquid state has been sufficiently investigated. For the solid state, precise thermal conductivity data are only known for a few paraffins, while only generalized values are available for the remainder, some of which contradict each other. In this study, a measurement setup based on the modified guarded hot plate method is developed. It is used to investigate the thermal conductivity of several paraffines in the solid state, including pure n-docosane and its compounds with different types and concentrations of graphite. For n-docosane in the solid state, the thermal conductivity is determined to be 0.49 W/(m K). A particle size of 200 μm with a spherical shape turns out to be optimal to increase the thermal conductivity. This allows the thermal conductivity of a compound with 10% graphite to increase by a factor of three compared to the pure paraffin. Furthermore, significant differences to thermal conductivity data from the literature are found. AU - Paul, Andreas AU - Baumhögger, Elmar AU - Dewerth, Mats-Ole AU - Hami Dindar, Iman AU - Sonnenrein, Gerrit AU - Vrabec, Jadran ID - 43391 JF - Journal of Thermal Analysis and Calorimetry KW - Physical and Theoretical Chemistry KW - Condensed Matter Physics SN - 1388-6150 TI - Thermal conductivity of solid paraffins and several n-docosane compounds with graphite ER - TY - CONF AB - Die für die Berechnung des Energieeffizienzindex von Haushaltskältegeräten benötigten Parameter werden durch Norm-Messungen im Neuzustand der Geräte bestimmt. Aus früheren Untersuchungen ist bekannt, dass durch verschiedene technische Alterungsmechanismen der Energieverbrauch über eine Produktlebensdauer von 18 Jahren um bis zu 33 % zunehmen kann. Ziel des vom BMWi geförderten Projekts ALGE war es, die verschie-denen Ursachen und Einflussgrößen für die Alterung von Haushaltskältegeräten zu ermitteln und eine Alterungs-funktion zu bestimmen, die den zeitlichen Verlauf des zunehmenden Energieverbrauchs beschreibt. In diesem Projekt wurde das Alterungsverhalten von Haushaltskältegeräten durch 100 Normenergieverbrauchs-messungen an 32 real gealterten Geräten untersucht. Aus den gewonnenen Ergebnissen konnte eine Alterungs-funktion bestimmt werden, die den Anstieg des Energieverbrauchs beschreibt. Alle untersuchten Geräte wurden an der Universität Paderborn im Neuzustand vermessen und nach einer Laufzeit von bis zu 21 Jahren erneut geprüft. Bereits nach einem zweijährigen Betrieb konnte ein Mehrverbrauch von bis zu 11 % festgestellt werden. Über die durchschnittliche Produktlebensdauer von Haushaltskältegeräten von ca. 16 Jahren steigert sich der Energieverbrauch um durchschnittlich 27 %. Im Rahmen des Projekts wurden verschiedene Systemkomponenten, wie Isolierung und Verdichter, hinsichtlich ihres Alterungsverhaltens untersucht. Bei dem im Gehäuse als Isolierung verwendeten PUR-Schaum konnte über einen Zeitraum von 31 Monaten ein Anstieg der Wärmeleitfähigkeit von 19,5 W/(m⋅K) auf 24,5 W/(m⋅K) festge-stellt werden. Zur Untersuchung der Alterung der Verdichter wurden zuvor auf einem Kalorimeterteststand ver-messene Verdichter in Geräte eingebaut. Nach einem zweijährigen Betrieb wurden diese Verdichter wieder aus-gebaut und erneut vermessen. Hierbei konnte keine Änderung des COP festgestellt werden. Zusätzlich zu den technischen Parametern wurde der Einfluss des Verbraucherverhaltens analysiert. Hier zeigte sich, dass bis zu 33 % des Gesamtenergieverbrauchs nach einer mehrjährigen Nutzungsdauer verbraucherinduziert sein können. AU - Paul, Andreas AU - Baumhögger, Elmar AU - Elsner, Andreas AU - Reineke, Michael AU - Kasper, Tina AU - Schumacher, Daniel AU - Vrabec, Jadran AU - Hüppe, Christian AU - Stamminger, Rainer AU - Hölscher, Heike AU - Stoll, Ragnar AU - Wagner, Hendrik AU - Gries, Ulrich AU - Becker, Wolfgang ID - 43394 KW - Haushaltskältegeräte KW - Energieverbrauch KW - Alterung KW - Verdichter KW - PUR-Schaum SN - 978-3-932715-55-6 TI - Alterungsmechanismen von Haushaltskältegeräten ER - TY - JOUR AB - Abstract The accessibility to rheological parameters for concrete is becoming more and more relevant. This is mainly related to the constantly emerging challenges, such as not only the development of high-strength concretes is progressing very fast but also the simulation of the flow behaviour is of high importance. The main problem, however, is that the rheological characterisation of fresh concrete is not possible via commercial rheometers. The so-called concrete rheometers provide valuable relative values for comparing different concretes, but they cannot measure absolute values. Therefore, we developed an adaptive coaxial concrete rheometer (ACCR) that allows the measurement of fresh concrete with particles up to d max = 5.5 mm {d}_{{\rm{\max }}}=5.5\hspace{.5em}{\rm{mm}} . The comparison of the ACCR with a commercial rheometer showed very good agreement for selected test materials (Newtonian fluid, shear thinning fluid, suspension, and yield stress fluid), so that self-compacting concrete was subsequently measured. Since these measurements showed a very high reproducibility, the rheological properties of the fresh concrete could be determined with high accuracy. The common flow models (Bingham (B), Herschel–Bulkley, modified Bingham (MB) models) were also tested for their applicability, with the Bingham and the modified Bingham model proving to be the best suitable ones. AU - Josch, Sebastian AU - Jesinghausen, Steffen AU - Schmid, Hans-Joachim ID - 43034 IS - 1 JF - Applied Rheology KW - Condensed Matter Physics KW - General Materials Science SN - 1617-8106 TI - Development of an adaptive coaxial concrete rheometer and rheological characterisation of fresh concrete VL - 33 ER - TY - CONF AU - Jende, Yvonne Kristin ID - 44225 T2 - Solidarités. Réseaux – Convivialités – Confrontations/ Solidarities. Networks – Convivialities – Confrontations, 44. Annual Conference of the Association for Canadian Studies in German-Speaking Countries TI - Please Mind the Gap. Reconfiguring Solidarity through Space in Michael Nicoll Yahgulanaas' Haida Manga Art. ER - TY - JOUR AU - Rüther, Moritz Johannes AU - Klippstein, Sven Helge AU - Ponusamy, SathishKumar AU - Rüther, Torben AU - Schmid, Hans-Joachim ID - 43128 JF - Powder Technology KW - General Chemical Engineering SN - 0032-5910 TI - Flowability of polymer powders at elevated temperatures for additive manufacturing VL - 422 ER - TY - JOUR AU - Wippermann, Jan AU - Meschut, Gerson AU - Koschukow, Wikentji AU - Liebsch, Alexander AU - Gude, Maik AU - Minch, Steven AU - Kolbe, Björn ID - 39057 JF - Welding in the World KW - Metals and Alloys KW - Mechanical Engineering KW - Mechanics of Materials SN - 0043-2288 TI - Thermal influence of resistance spot welding on a nearby overmolded thermoplastic–metal joint ER - TY - JOUR AU - Wippermann, Jan AU - Koshukow, Wikentij AU - Liebsch, Alexander AU - Kolbe, Björn AU - Meschut, Gerson AU - Gude, Maik ID - 44232 JF - Tagungsband Münchener Leichtbauseminar 2022 TI - Influence of plasma coating pretreatment on the adhesion of thermoplastics to metals ER - TY - GEN AU - Ponusamy, SathishKumar AU - Schmid, Hans-Joachim ID - 44244 TI - Dynamisch-mechanische Polymerpartikelverrundung zur Verbesserung der Fließfähigkeit für das selektive Lasersintern ER - TY - CHAP AB - State education in honest tax payment can be understood as a facet of training in citizenship, i.e. as an attempt by the modern state to standardize the behavior of its citizens and to prevent deviations. Based on this Foucauldian understanding, this exploratory article examines tax education in the United States, Spain, and West Germany from the mid-1940s to the late 1980s. During this period, the USA asserted itself as the champion of tax education and Spain consistently tried to emulate this example, albeit with more modest means and different semantic strategies from as early as the 1960s, when it was still under a autoritarian regime. The FRG, however, completely discontinued its few early attempts at tax education from the mid-1950s onwards. Even during the economic crises and tax scandals of the 1970s, there was no relaunch of the programs. The article locates the reasons for this highly uneven development in the different ideal images of the citizen in the three states. AU - Schönhärl, Korinna AU - Düll, Nasrin AU - Ramírez Lugo , Nadya Melina ED - Sébastien, Guex ED - Hadrien, Buclin ID - 44249 T2 - Tax Evasion and Tax Havens since the Nineteenth Century TI - Tax Education After WWII: How Spain, the USA, and West Germany Tried to Make Their Citizens Pay Honestly ER - TY - JOUR AU - Behler, Felix ID - 44264 IS - 3 JF - Interdisciplinary Discourses, Education and Analysis (IDEA) SN - 2754-2416 TI - Recapturing Old England – Nostalgia, Aristo-Anglophilia, and the Historical Roots of ITV’s ‘Downton Abbey’ VL - 1 ER - TY - CONF AB - Abstract. Due to an increasing volume of shipments, there is a significant need for more delivery vehicles. One approach to reduce the associated increase in carbon dioxide (CO2) emissions is a new light weight design approach involving the substitution of conventional materials with glass fiber mat-reinforced thermoplastics (GMT) based on polypropylene (PP). The application of GMT by compression molding is a widely used process in the automotive industry. However, application in the commercial vehicle sector requires much larger dimensions, making it necessary to clarify whether the manufacturing process and material are suitable for semi-structural applications on this scale. To find this out, two replacement geometries are abstracted in this study and manufactured by varying the main manufacturing parameters. The feasibility can be demonstrated by recording and analyzing the resulting process variables and measuring the formed fiber distribution. At the end of the paper, recommendations are given for the production of GMT structures on the scale of commercial vehicles. AU - Lückenkötter, Julian AU - Leimbach, J.P. AU - Stallmeister, Tim AU - Marten, Thorsten AU - Tröster, Thomas ID - 44154 KW - Compression Molding KW - Fiber Content KW - Process Development KW - Lightweight Design T2 - Materials Research Proceedings TI - Feasibility Study of Compression Molding for Large Reinforcement Structures in the Commercial Vehicle Sector VL - 28 ER - TY - JOUR AB - The Saharan desert ant Cataglyphis bombycina is densely covered with shiny silver setae (hair-like structures). Their appearance was explained by geometric optics and total internal reflection. The setae also increase the emissivity of the ant, as they form an effective medium. This work provides additional data on microstructural details of the setae that are used to simulate the scattering of an individual seta to explain their influence on the optical properties. This is achieved by characterization of their structure using light microscopy and scanning/transmission electron microscopy. How the microstructural features influence scattering is investigated wave-optically within the limits of finite-difference time-domain simulations from the ultraviolet to the mid-infrared spectral range to elucidate the optical effects beyond ray optics and effective medium theory. The results show that Mie scattering plays an important role in protecting the ant from solar radiation and could be relevant for its thermal tolerance. AU - Schwind, Bertram AU - Wu, Xia AU - Tiemann, Michael AU - Fabritius, Helge-Otto ID - 42679 IS - 3 JF - Journal of the Optical Society of America B KW - Atomic and Molecular Physics KW - and Optics KW - Statistical and Nonlinear Physics SN - 0740-3224 TI - Broadband Mie scattering effects by structural features of setae from the Saharan silver ant Cataglyphis bombycina VL - 40 ER - TY - JOUR AB - The production of hydrogen and the utilization of biomass for sustainable concepts of energy conversion and storage require gas sensors that discriminate between hydrogen (H2) and carbon monoxide (CO). Mesoporous copper–ceria (Cu–CeO2) materials with large specific surface areas and uniform porosity are prepared by nanocasting, and their textural properties are characterized by N2 physisorption, powder XRD, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation states of copper (Cu+, Cu2+) and cerium (Ce3+, Ce4+) are investigated by XPS. The materials are used as resistive gas sensors for H2 and CO. The sensors show a stronger response to CO than to H2 and low cross-sensitivity to humidity. Copper turns out to be a necessary component; copper-free ceria materials prepared by the same method show only poor sensing performance. By measuring both gases (CO and H2) simultaneously, it is shown that this behavior can be utilized for selective sensing of CO in the presence of H2. AU - Baier, Dominik AU - Priamushko, Tatiana AU - Weinberger, Christian AU - Kleitz, Freddy AU - Tiemann, Michael ID - 43457 IS - 4 JF - ACS Sensors KW - Fluid Flow and Transfer Processes KW - Process Chemistry and Technology KW - Instrumentation KW - Bioengineering SN - 2379-3694 TI - Selective Discrimination between CO and H2 with Copper–Ceria-Resistive Gas Sensors VL - 8 ER - TY - CONF AB - Abstract. The combination of incremental sheet metal forming and high-speed forming offers new possibilities for flexible forming processes in the production of large sheet metal components of increased complexity with relatively low forming energies. In this paper, the general feasibility and process differences between the pulse-driven high-speed forming technologies of electrohydraulic and electromagnetic forming were investigated. An example component made of EN AW 6016 aluminum sheet metal was thus formed incrementally by both processes and the forming result evaluated by an optical 3D measurement system. For this purpose, a forming strategy for electromagnetic incremental forming (EMIF) was developed, tested and adapted to the electrohydraulic incremental forming process (EHIF). The discharge energy, the tool displacement and the pressure field of the forming zone were determined as relevant parameters for the definition of an adequate tool path strategy. It was found that the EHIF process is less affected by larger distances between the tool and the blank, while this is a critical variable for force application to the component during EMIF. On the other hand, the more uniform pressure distribution of the EMIF process is advantageous for forming large steady component areas. AU - Holzmüller, Maik AU - Linnemann, Maik AU - Homberg, Werner AU - Psyk, Verena AU - Kräusel, Verena AU - Kroos, Janika ID - 43044 KW - Incremental Sheet Forming KW - Aluminium KW - High-Speed Forming SN - 2474-395X T2 - Materials Research Proceedings TI - Proof of concept for incremental sheet metal forming by means of electromagnetic and electrohydraulic high-speed forming VL - 25 ER - TY - JOUR AB - The pressure fields generated by two simultaneous discharges have not been investigated on any notable scale for the electrohydraulic impulse forming method. In this study, the synchronicity of two discharges is ensured by the sequential connection of two wires mounted in two spark gaps in a common volume of liquid. The objective is to experimentally confirm the equilibrium of the energies evolved in two spark gaps by means of pressure measurements. In addition, multipoint membrane pressure gauges demonstrated the feasibility of easily recording detailed pressure maps. Based on the membrane deformation mechanism and material strengthening under static and impulse conditions, the processing procedure is further developed so as to achieve better accuracy in the determination of pressure field parameters. The practical equality of the pressure fields on the left and right halves of the flat-loaded area confirms the equality of energies evolved in the two spark gaps. The direct shock waves create zones with the most intensive loading. These results provide a basis for the development of new electrohydraulic technologies involving the application of two simultaneous discharges with equal energy and pressure parameters. AU - Knyazyev, Mykhaylo AU - Holzmüller, Maik AU - Homberg, Werner ID - 43045 IS - 1 JF - Journal of Manufacturing and Materials Processing KW - impulse KW - forming KW - electrohydraulic KW - discharge KW - wire KW - pressure gauge KW - pressure field SN - 2504-4494 TI - Investigation of Pressure Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires VL - 7 ER - TY - JOUR AU - Neumann, Phillip ID - 44321 IS - 5 JF - Zeitschrift für Heilpädagogik KW - Inklusion KW - Sonderpädagogik KW - Bildung KW - Bildungsstudien KW - Integration SN - 0513-9066 TI - Studien zu Schulleistungen und ihre Aufbereitung VL - 74 ER - TY - CONF AU - Hami Dindar, Iman AU - Lutters, Nicole AU - Kenig, Eugeny ID - 44320 T2 - Jahrestreffen der ProcessNet-Fachgruppen Fluidverfahrenstechnik und Adsoprtion TI - Wässrige Glucosaminlösung als neues Lösungsmittel zur CO2-Abscheidung ER - TY - CONF AB - State estimation when only a partial model of a considered system is available remains a major challenge in many engineering fields. This work proposes a joint, square-root unscented Kalman filter to estimate states and model uncertainties simultaneously by linear combinations of physics-motivated library functions. Using a sparsity promoting approach, a selection of those linear combinations is chosen and thus an interpretable model can be extracted. Results indicate a small estimation error compared to a traditional square-root unscented Kalman filter and exhibit the enhancement of physically meaningful models. AU - Götte, Ricarda-Samantha AU - Timmermann, Julia ID - 34171 IS - 1 KW - joint estimation KW - unscented transform KW - Kalman filter KW - sparsity KW - data-driven KW - compressed sensing T2 - 12th IFAC Symposium on Nonlinear Control Systems (NOLCOS 2022) TI - Estimating States and Model Uncertainties Jointly by a Sparsity Promoting UKF VL - 56 ER - TY - JOUR AB - Room temperature sodium-sulfur (RT Na-S) batteries are considered potential candidates for stationary power storage applications due to their low cost, broad active material availability and low toxicity. Challenges, such as high volume expansion of the S-cathode upon discharge, low electronic conductivity of S as active material and herewith limited rate capability as well as the shuttling of polysulfides (PSs) as intermediates often impede the cycle stability and practical application of Na-S batteries. Sulfurized poly(acrylonitrile) (SPAN) inherently inhibits the shuttling of PSs and shows compatibility with carbonate-based electrolytes, however, its exact redox mechanism remained unclear to date. Herein, we implement a commercially available and simple electrolyte into the Na-SPAN cell chemistry and demonstrate its high rate and cycle stability. Through the application of in situ techniques utilizing electronic impedance spectroscopy (EIS) and X-ray absorption spectroscopy (XAS) at different depths of charge and discharge, an insight into SPAN’s redox chemistry is obtained. AU - Kappler, Julian AU - Tonbul, Güldeniz AU - Schoch, Roland AU - Murugan, Saravanakumar AU - Nowakowski, Michał AU - Lange, Pia Lena AU - Klostermann, Sina Vanessa AU - Bauer, Matthias AU - Schleid, Thomas AU - Kästner, Johannes AU - Buchmeiser, Michael Rudolf ID - 40981 IS - 1 JF - Journal of The Electrochemical Society KW - Materials Chemistry KW - Electrochemistry KW - Surfaces KW - Coatings and Films KW - Condensed Matter Physics KW - Renewable Energy KW - Sustainability and the Environment KW - Electronic KW - Optical and Magnetic Materials SN - 0013-4651 TI - Understanding the Redox Mechanism of Sulfurized Poly(acrylonitrile) as Highly Rate and Cycle Stable Cathode Material for Sodium-Sulfur Batteries VL - 170 ER - TY - JOUR AB - The success of engineering complex technical systems is determined by meeting customer requirements and institutional regulations. One example relevant to the automobile industry is the United Nations Economic Commission of Europe (UN ECE), which specifies the homologation of automobile series and requires proof of traceability. The required traceability can be achieved by modeling system artifacts and their relations in a consistent, seamless model—an effect-chain model. Currently, no in-depth methodology exists to support engineers in developing certification-compliant effect-chain models. For this purpose, a new methodology for certification-compliant effect-chain modeling was developed, which includes extensions of an existing method, suitable models, and tools to support engineers in the modeling process. For evaluation purposes, applicability is proven based on the experience of more than 300 workshops at an automotive OEM and an automotive supplier. The following case example is chosen to demonstrate applicability: the development of a window lifter that has to meet the demands of UN ECE Regulations R156 and R21. Results indicate multiple benefits in supporting engineers with the certification-compliant modeling of effect chains. Three benefits are goal-oriented modeling to reduce the necessary modeling capacity, increasing model quality by applying information quality criteria, and the potential to reduce costs through automatable effect-chain analyses for technical changes. Further, companies in the automotive and other industries will benefit from increased modeling capabilities that can be used for architecture modeling and to comply with other regulations such as ASPICE or ISO 26262. AU - Gräßler, Iris AU - Wiechel, Dominik AU - Koch, Anna-Sophie AU - Sturm, Tim AU - Markfelder, Thomas ID - 44382 IS - 3 JF - Systems KW - Information Systems and Management KW - Computer Networks and Communications KW - Modeling and Simulation KW - Control and Systems Engineering KW - Software SN - 2079-8954 TI - Methodology for Certification-Compliant Effect-Chain Modeling VL - 11 ER - TY - GEN AU - Tonbul, Güldeniz AU - Kappler, Julian AU - Murugan, Saravanakumar AU - Schoch, Roland AU - Nowakowski, Michal AU - Lange, Pia AU - Bauer, Matthias AU - Buchmeiser, Michael R. ID - 44380 TI - Characterization of Na-S Battery System Using X-ray Absorption Spectroscopy ER - TY - CONF AB - The development of autonomous vehicles and their introduction in urban traffic offer many opportunities for traffic improvements. In this paper, an approach for a future traffic control system for mixed autonomy traffic environments is presented. Furthermore, a simulation framework based on the city of Paderborn is introduced to enable the development and examination of such a system. This encompasses multiple elements including the road network itself, traffic lights, sensors as well as methods to analyse the topology of the network. Furthermore, a procedure for traffic demand generation and routing is presented based on statistical data of the city and traffic data obtained by measurements. The resulting model can receive and apply the generated control inputs and in turn generates simulated sensor data for the control system based on the current system state. AU - Link, Christopher AU - Malena, Kevin AU - Gausemeier, Sandra AU - Trächtler, Ansgar ID - 44390 KW - Traffic Simulation KW - Traffic Control KW - Car2X KW - Mixed Autonomy KW - Autonomous Vehicles KW - SUMO KW - Sensor Simulation KW - Traffic Demand Generation KW - Routing KW - Traffic Lights KW - Graph Analysis KW - Traffic Observer SN - 978-989-758-652-1 T2 - Proceedings of the 9th International Conference on Vehicle Technology and Intelligent Transport Systems TI - Simulation Environment for Traffic Control Systems Targeting Mixed Autonomy Traffic Scenarios ER - TY - CONF AU - Althaus, Maike AU - Müller, Michelle AU - Vorbohle, Christian AU - Kundisch, Dennis ID - 44444 T2 - Proceedings of the International Conference on Challenges in Managing Smart Products and Services (CHIMSPAS 2023) TI - Business Models for Cultural Event Platforms – A Taxonomy Approach ER - TY - CONF AU - Laux, Florian AU - Poniatowski, Martin AU - Kundisch, Dennis ID - 44053 T2 - Proceedings of the 31st European Conference on Information Systems (ECIS) TI - May I have your Attention, please? – The Interaction between Attention Screening and Reputation on Crowdworking Platforms ER - TY - GEN AU - Neukötter, Moritz AU - Jesinghausen, Steffen AU - Schmid, Hans-Joachim ID - 44103 TI - Particles as Seeds for Instabilities in Uniaxially Elongated Polymer Suspension Filaments (Presentation) ER - TY - JOUR AU - Küster, Christine AU - Klünder, Nina AU - Wagenknecht, Inga ID - 44477 JF - Hauswirtschaft und Wissenschaft SN - 2626-0913 TI - Haushaltswissenschaft – Eine Diskussionsgrundlage VL - 71 ER - TY - CHAP AU - Meine, Sabine AU - Otto, Arnold AU - Süßmann, Johannes ID - 35063 SN - 978-3-8260-7218-5 T2 - Musiklandschaften zwischen Rhein und Weser. Pluralisierung und Verflechtung entlang des Hellwegs in der Frühen Neuzeit. Unter Mitarbeit v. Markus Lauert TI - Musiklandschaften zwischen Rhein und Weser – Einführung ER - TY - CONF AU - Gharibian, Sevag AU - Watson, James AU - Bausch, Johannes ID - 20841 T2 - Proceedings of the 40th International Symposium on Theoretical Aspects of Computer Science (STACS) TI - The Complexity of Translationally Invariant Problems beyond Ground State Energies VL - 254 ER - TY - GEN AB - Extending the notion of maxcut, the study of the frustration index of signed graphs is one of the basic questions in the theory of signed graphs. Recently two of the authors initiated the study of critically frustrated signed graphs. That is a signed graph whose frustration index decreases with the removal of any edge. The main focus of this study is on critical signed graphs which are not edge-disjoint unions of critically frustrated signed graphs (namely non-decomposable signed graphs) and which are not built from other critically frustrated signed graphs by subdivision. We conjecture that for any given k there are only finitely many critically k-frustrated signed graphs of this kind. Providing support for this conjecture we show that there are only two of such critically 3-frustrated signed graphs where there is no pair of edge-disjoint negative cycles. Similarly, we show that there are exactly ten critically 3-frustrated signed planar graphs that are neither decomposable nor subdivisions of other critically frustrated signed graphs. We present a method for building non-decomposable critically frustrated signed graphs based on two given such signed graphs. We also show that the condition of being non-decomposable is necessary for our conjecture. AU - Cappello, Chiara AU - Naserasr, Reza AU - Steffen, Eckhard AU - Wang, Zhouningxin ID - 44501 T2 - arXiv:2304.10243 TI - Critically 3-frustrated signed graphs ER - TY - JOUR AU - Tapio, Kosti AU - Kielar, Charlotte AU - Parikka, Johannes M. AU - Keller, Adrian AU - Järvinen, Heini AU - Fahmy, Karim AU - Toppari, J. Jussi ID - 42517 JF - Chemistry of Materials KW - Materials Chemistry KW - General Chemical Engineering KW - General Chemistry SN - 0897-4756 TI - Large-Scale Formation of DNA Origami Lattices on Silicon VL - 35 ER - TY - JOUR AU - Pothineni, Bhanu Kiran AU - Keller, Adrian ID - 42518 JF - Advanced NanoBiomed Research KW - General Medicine SN - 2699-9307 TI - Nanoparticle‐Based Formulations of Glycopeptide Antibiotics: A Means for Overcoming Vancomycin Resistance in Bacterial Pathogens? VL - 3 ER - TY - JOUR AU - Hanke, Marcel AU - Tomm, Emilia AU - Grundmeier, Guido AU - Keller, Adrian ID - 44503 JF - ChemBioChem KW - Organic Chemistry KW - Molecular Biology KW - Molecular Medicine KW - Biochemistry SN - 1439-4227 TI - Effect of Ionic Strength on the Thermal Stability of DNA Origami Nanostructures ER - TY - JOUR AU - Linko, Veikko AU - Keller, Adrian ID - 44504 JF - Small KW - Biomaterials KW - Biotechnology KW - General Materials Science KW - General Chemistry SN - 1613-6810 TI - Stability of DNA Origami Nanostructures in Physiological Media: The Role of Molecular Interactions ER - TY - THES AU - Kruse, Anne ID - 44509 SN - 978-3-8440-8955-4 TI - Entwicklung einer Methode zur Integration der Additiven Fertigung in die Serienproduktion am Beispiel des Lasersinterns VL - 27 ER - TY - GEN AB - For open world applications, deep neural networks (DNNs) need to be aware of previously unseen data and adaptable to evolving environments. Furthermore, it is desirable to detect and learn novel classes which are not included in the DNNs underlying set of semantic classes in an unsupervised fashion. The method proposed in this article builds upon anomaly detection to retrieve out-of-distribution (OoD) data as candidates for new classes. We thereafter extend the DNN by $k$ empty classes and fine-tune it on the OoD data samples. To this end, we introduce two loss functions, which 1) entice the DNN to assign OoD samples to the empty classes and 2) to minimize the inner-class feature distances between them. Thus, instead of ground truth which contains labels for the different novel classes, the DNN obtains a single OoD label together with a distance matrix, which is computed in advance. We perform several experiments for image classification and semantic segmentation, which demonstrate that a DNN can extend its own semantic space by multiple classes without having access to ground truth. AU - Uhlemeyer, Svenja AU - Lienen, Julian AU - Hüllermeier, Eyke AU - Gottschalk, Hanno ID - 44512 T2 - arXiv:2305.00983 TI - Detecting Novelties with Empty Classes ER -