TY - CONF AB - Savitch's theorem states that NPSPACE computations can be simulated in PSPACE. We initiate the study of a quantum analogue of NPSPACE, denoted Streaming-QCMASPACE (SQCMASPACE), where an exponentially long classical proof is streamed to a poly-space quantum verifier. Besides two main results, we also show that a quantum analogue of Savitch's theorem is unlikely to hold, as SQCMASPACE=NEXP. For completeness, we introduce Streaming-QMASPACE (SQMASPACE) with an exponentially long streamed quantum proof, and show SQMASPACE=QMA_EXP (quantum analogue of NEXP). Our first main result shows, in contrast to the classical setting, the solution space of a quantum constraint satisfaction problem (i.e. a local Hamiltonian) is always connected when exponentially long proofs are permitted. For this, we show how to simulate any Lipschitz continuous path on the unit hypersphere via a sequence of local unitary gates, at the expense of blowing up the circuit size. This shows quantum error-correcting codes can be unable to detect one codeword erroneously evolving to another if the evolution happens sufficiently slowly, and answers an open question of [Gharibian, Sikora, ICALP 2015] regarding the Ground State Connectivity problem. Our second main result is that any SQCMASPACE computation can be embedded into "unentanglement", i.e. into a quantum constraint satisfaction problem with unentangled provers. Formally, we show how to embed SQCMASPACE into the Sparse Separable Hamiltonian problem of [Chailloux, Sattath, CCC 2012] (QMA(2)-complete for 1/poly promise gap), at the expense of scaling the promise gap with the streamed proof size. As a corollary, we obtain the first systematic construction for obtaining QMA(2)-type upper bounds on arbitrary multi-prover interactive proof systems, where the QMA(2) promise gap scales exponentially with the number of bits of communication in the interactive proof. AU - Gharibian, Sevag AU - Rudolph, Dorian ID - 31872 T2 - 14th Innovations in Theoretical Computer Science (ITCS) TI - Quantum space, ground space traversal, and how to embed multi-prover interactive proofs into unentanglement VL - 251 ER - TY - JOUR AB - We propose a new method to estimate and isolate the localization of knowledge spillovers due to the physical presence of a person, using after-application but pre-grant deaths of differently located coinventors of the same patent. The approach estimates the differences in local citations between the deceased and still-living inventors at increasingly distant radii. Patents receive 26 percent fewer citations from within a radius of 20 miles around the deceased, relative to still-living coinventors. Differences attenuate with time and distance, are stronger when still-living coinventors live farther from the deceased, and hold for a subsample of possibly premature deaths. (JEL O31, O33, O34, R32) AU - Balsmeier, Benjamin AU - Fleming, Lee AU - Lück, Sonja ID - 42638 IS - 1 JF - American Economic Review: Insights KW - Management KW - Monitoring KW - Policy and Law KW - Geography KW - Planning and Development SN - 2640-205X TI - Isolating Personal Knowledge Spillovers: Coinventor Deaths and Spatial Citation Differentials VL - 5 ER - TY - CONF AU - Chudalla, Nick AU - Meschut, Gerson AU - Schneider, Miriam AU - Smart, Dominic ID - 42643 TI - Systematisierung einer rechnergestützten Auswertemethode zur Versagensanalyse geklebter Verbindungen ER - TY - JOUR AB - In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. For this reason, a considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, here we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical scheme that we have devised in order to model controlled particle losses, we describe an experimental platform capable of implementing our theory in a time multiplexing encoding. In the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties. Finally we devise a quantum civilization problem, a two walker generalisation of single particle recurrence processes. AU - Pegoraro, Federico AU - Held, Philip AU - Barkhofen, Sonja AU - Brecht, Benjamin AU - Silberhorn, Christine ID - 42648 IS - 3 JF - Physica Scripta SN - 0031-8949 TI - Dynamic conditioning of two particle discrete-time quantum walks VL - 98 ER - TY - CONF AU - Schmolke, Tobias AU - Meschut, Gerson AU - Spohr, Sebastian AU - Eckstein, Lutz AU - Brunner-Schwer, Christian AU - Rethmeier, Michael AU - Nothhelfer-Richter, Rolf AU - Hilt, Michael ID - 42666 TI - Konzeptentwicklung für ein Stahlbatteriegehäuse unter besonderer Berücksichtigung der Fügetechnik und des Korrosionsschutzes ER - TY - CONF AU - Schmolke, Tobias AU - Meschut, Gerson ID - 42667 TI - Leak Tightness of Bonded Joints in Battery Housings Under Mechanical and Corrosive Loads ER - TY - BOOK ED - Beverungen, Daniel ED - Becker, Jörg ED - Gadeib, Andera ED - Schmitz, Gertrud ID - 42680 SN - 9783662658130 TI - Interaktive Einkaufserlebnisse in Innenstädten ER - TY - CHAP AU - zur Heiden, Philipp ED - Schulz, Michael ED - Neuhaus, Uwe ED - Kühnel, Stephan ED - Rohde, Heiko ED - Hoseini, Sayed ED - Theuerkauf, René ID - 42681 T2 - DASC-PM v1.1 Fallstudien TI - Projekt FLEMING – Predictive Maintenance von zentralen Komponenten des Mittelspannungsnetzes ER - TY - JOUR AU - Haller, Melanie ID - 39549 JF - Tietze, Katharina/Schnittler, Anna-Brigitta: Mode und Gender. TI - Frauensache(n)? Mode und Gender aus feministischer Perspektive. ER - TY - CHAP AU - Fuchs, Christian ED - Schönefeld, Daniel ED - von Gahlen-Hoops, Wolfgang ID - 35151 SN - 978-3-8394-6154-9 T2 - Soziale Ordnungen des Sterbens: Theorie, Methodik und Einblicke in die Vergänglichkeit TI - Der Tod und die Liebe: Die Metaphysik der Kommunikation ER - TY - BOOK AU - Fuchs, Christian ID - 37189 TI - Digital Ethics. Media, Communication and Society Volume Five ER - TY - CONF AU - Nagel, Christof AU - Carillo Beber, Vinicius AU - Mayer, Bernd AU - Köster, Christian AU - Matzenmiller, Anton AU - Hecht, Matthias AU - Baumgartner, Jörg AU - Melz, Tobias AU - Tews, Karina AU - Çavdar, Serkan AU - Meschut, Gerson ID - 42763 T2 - 23. Kolloquium: Gemeinsame Forschung in der Klebtechnik TI - Lebensdauerprognose für Stahlklebverbindungen bei multiaxialer Belastung mit Phasenverschiebung, veränderlicher Mittelspannung und variablen Amplituden ER - TY - GEN AU - Tews, Karina AU - Teutenberg, Dominik AU - Meschut, Gerson ID - 42766 TI - Experimental investigation of the fatigue behavior and calculation of the service life of adhesively bonded joints ER - TY - CONF AB - This paper presents a method to model monolithically integrated photonic radar transceiver (TRX) with optical local oscillator (LO) distribution in silicon germanium (SiGe) electronic photonic integrated circuits (EPICs). The model proposed approximates the behavior of the nonlinear scattering (S)-parameters and noise figure of each building block of the TRX chipset by Laplace polynomials and hyperbolic tangent functions. The modular approach of the model allows to optimize hardware components with respect to the entire TRX system, and fault identification with reduced computational effort. The proposed method is validated using the first monolithically integrated photonic radar transceiver chipset and shows excellent agreement with the post layout simulation results and, including the photodiode (PD) bandwidth (BW) degradation, also with the measurements. AU - Kruse, Stephan AU - Schwabe, Tobias AU - Kneuper, Pascal AU - Meinecke, Marc-Michael AU - Kurz, Heiko G. AU - Scheytt, J. Christoph ID - 42804 TI - Nonlinear S-Parameter Behavioral Model of a Photonic Radar Transceiver Chipset for Automotive Applications ER - TY - BOOK AU - Fuchs, Christian ID - 35896 SN - 978-3-7799-7144 TI - Der digitale Kapitalismus. Arbeit, Entfremdung und Ideologie im Informationszeitalter ER - TY - JOUR AU - Göddecke, Johannes AU - Meschut, Gerson AU - Damm, Jannis AU - Albiez, Matthias AU - Ummenhofer, Thomas AU - Kötz, Fabian AU - Matzenmiller, Anton ID - 42872 JF - The Journal of Adhesion SN - 0021-8464 TI - Experimental and numerical investigation of the damping properties of adhesively bonded tubular steel joints ER - TY - JOUR AB - Regularization is used in many different areas of optimization when solutions are sought which not only minimize a given function, but also possess a certain degree of regularity. Popular applications are image denoising, sparse regression and machine learning. Since the choice of the regularization parameter is crucial but often difficult, path-following methods are used to approximate the entire regularization path, i.e., the set of all possible solutions for all regularization parameters. Due to their nature, the development of these methods requires structural results about the regularization path. The goal of this article is to derive these results for the case of a smooth objective function which is penalized by a piecewise differentiable regularization term. We do this by treating regularization as a multiobjective optimization problem. Our results suggest that even in this general case, the regularization path is piecewise smooth. Moreover, our theory allows for a classification of the nonsmooth features that occur in between smooth parts. This is demonstrated in two applications, namely support-vector machines and exact penalty methods. AU - Gebken, Bennet AU - Bieker, Katharina AU - Peitz, Sebastian ID - 27426 IS - 3 JF - Journal of Global Optimization TI - On the structure of regularization paths for piecewise differentiable regularization terms VL - 85 ER - TY - JOUR AU - Sherman, David A. AU - Baumeister, Jochen AU - Stock, Matt S. AU - Murray, Amanda M. AU - Bazett-Jones, David M. AU - Norte, Grant E. ID - 42966 JF - Medicine & Science in Sports & Exercise KW - Physical Therapy KW - Sports Therapy and Rehabilitation KW - Orthopedics and Sports Medicine SN - 1530-0315 TI - Weaker Quadriceps Corticomuscular Coherence in Individuals Following ACL Reconstruction during Force Tracing VL - Publish Ahead of Print ER - TY - JOUR AU - Büchel, Daniel AU - Torvik, PØ AU - Lehmann, Tim AU - Sandbakk, Ø AU - Baumeister, Jochen ID - 42967 JF - Med Sci Sports Exerc SN - 0195-9131 TI - The Mode of Endurance Exercise Influences Changes in EEG Resting State Graphs among High-Level Cross-Country Skiers. ER - TY - JOUR AU - Sherman, DA AU - Baumeister, Jochen AU - Stock, MS AU - Murray, AM AU - Bazett-Jones, DM AU - Norte, GE ID - 42965 IS - 3 JF - Med Sci Sports Exerc SN - 0195-9131 TI - Inhibition of Motor Planning and Response Selection after Anterior Cruciate Ligament Reconstruction. VL - 55 ER - TY - JOUR AU - Alhaddad, Samer AU - Förstner, Jens AU - Grynko, Yevgen ID - 43018 JF - Journal of Quantitative Spectroscopy and Radiative Transfer KW - tet_topic_scattering SN - 0022-4073 TI - Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength VL - 302 ER - TY - CONF AU - Mwammenywa, Ibrahim AU - Petrov, Dmitry AU - Holle, Philipp AU - Hilleringmann, Ulrich ID - 39359 T2 - 2022 International Conference on Engineering and Emerging Technologies (ICEET) TI - LoRa Transceiver for Load Monitoring and Control System in Microgrids ER - TY - CHAP AU - Fuchs, Christian ED - Popp, Judith-Frederike ED - Voropai, Lioudmila ID - 38150 T2 - Adorno und die Medien: Kritik, Relevanz, Ethik TI - Adorno and the Media in Digital Capitalism ER - TY - GEN AU - Lienen, Christian AU - Middeke, Sorel Horst AU - Platzner, Marco ID - 43048 TI - fpgaDDS: An Intra-FPGA Data Distribution Service for ROS 2 Robotics Applications ER - TY - JOUR AB - Artificial intelligence (AI) has moved beyond the planning phase in many organisations and it is often accompanied by uncertainties and fears of job loss among employees. It is crucial to manage employees attitudes towards the deployment of an AI-based technology effectively and counteract possible resistance behaviour. We present lessons learned from an industry case where we conducted interviews with affected employees. We evaluated derived resistance to AI factors in a large-scale (N = 368) survey and found that the deployment of AI-based technologies does not differ from other IT, but that the change is perceived differently due to misguided expectations. AU - Stieglitz, Stefan AU - Möllmann, Nicholas R.J. AU - Mirbabaie, Milad AU - Hofeditz, Lennart AU - Ross, Björn ID - 43054 IS - 4 JF - International Journal of Management Practice TI - Recommendations for managing AI-driven change processes: when expectations meet reality VL - 16 ER - TY - GEN AU - Tiessen, Michelle ID - 43058 TI - Zur Effektivität des europäischen Kronzeugenprogramms - Der Fall des LKW-Kartells ER - TY - JOUR AU - Mistry, Aashutosh AU - Srinivasan, Venkat AU - Steinrück, Hans-Georg ID - 37267 JF - Advanced Energy Materials KW - General Materials Science KW - Renewable Energy KW - Sustainability and the Environment SN - 1614-6832 TI - Characterizing Ion Transport in Electrolytes via Concentration and Velocity Profiles VL - 13 ER - TY - JOUR AB - AbstractComposite materials, such as fiber reinforced polymers, become increasingly important due to their excellent mechanical and lightweight properties. In this respect, this paper reports the characterization of a unidirectional carbon fiber reinforced polymer composite material. Particularly, the mechanical behavior of the overall composite and of the individual constituents of the composite is investigated. To this end, tensile and shear tests are performed for the composite. As a result, statistics for five transversely isotropic material parameters can be established for the composite. For the description of the mechanical properties of the constituents, tensile tests for the carbon fiber as well as for the polymer matrix are carried out. In addition, the volume fraction of fibers in the matrix is determined experimentally using an ashing technique and Archimedes’ principle. For the Young’s modulus of the fiber, the Young’s modulus and transverse contraction of the matrix, as well as the volume fraction of the constituents, statistics can be concluded. The resulting mechanical properties on both scales are useful for the application and validation of different material models and homogenization methods. Finally, in order to validate the obtained properties in the future, inhomogeneous tests were performed, once a flat plate with a hole and a flat plate with semicircular notches. AU - Penner, Eduard AU - Caylak, Ismail AU - Mahnken, Rolf ID - 42165 JF - Fibers and Polymers KW - Polymers and Plastics KW - General Chemical Engineering KW - General Chemistry SN - 1229-9197 TI - Experimental Investigations of Carbon Fiber Reinforced Polymer Composites and Their Constituents to Determine Their Elastic Material Properties and Complementary Inhomogeneous Experiments with Local Strain Considerations ER - TY - JOUR AU - Lenz, Peter AU - Mahnken, Rolf ID - 43095 JF - Composite Structures KW - Civil and Structural Engineering KW - Ceramics and Composites SN - 0263-8223 TI - Non-local integral-type damage combined to mean-field homogenization methods for composites and its parallel implementation ER - TY - CONF AU - Hoffmann, Max AU - Biehler, Rolf ED - Trigueros, Marı́a ED - Barquero, Berta ED - Hochmuth, Reinhard ED - Peters, Jana ID - 31849 KW - Teaching and learning of specific topics in university mathematics KW - Transition to KW - across and from university mathematics KW - Student Teachers KW - Geometry KW - Congruence KW - Double Discontinuity. T2 - Proceedings of the Fourth Conference of the International Network for Didactic Research in University Mathematics (INDRUM 2022, 19-22 October 2022) TI - Student Teachers ’ Knowledge of Congruence before a University Course on Geometry ER - TY - CONF AU - Florensa, Ignasio AU - Hoffmann, Max AU - Romo Vázquez, Avenilde AU - Zandieh, Michelle AU - Martínez-Planell, Rafael ED - Trigueros, Marı́a ED - Barquero, Berta ED - Hochmuth, Reinhard ED - Peters, Jana ID - 43097 T2 - Proceedings of the Fourth Conference of the International Network for Didactic Research in University Mathematics (INDRUM 2022, 19-22 October 2022) TI - Innovations in university teaching based on mathematic education research ER - TY - JOUR AU - Götte, Thorsten AU - Kolb, Christina AU - Scheideler, Christian AU - Werthmann, Julian ID - 43109 JF - Theor. Comput. Sci. TI - Beep-and-Sleep: Message and Energy Efficient Set Cover VL - 950 ER - TY - GEN AU - Süßmann, Johannes ID - 43186 TI - Pantheon ER - TY - DATA AU - Claes, Leander AU - Webersen, Manuel ID - 12950 TI - pyfds 0.1.6 - modular field simulation tool ER - TY - JOUR AB - The achievement of a flat metasurface has realized extraordinary control over light–matter interaction at the nanoscale, enabling widespread use in imaging, holography, and biophotonics. However, three-dimensional metasurfaces with the potential to provide additional light–matter manipulation flexibility attract only little interest. Here, we demonstrate a three-dimensional metasurface scheme capable of providing dual phase control through out-of-plane plasmonic resonance of L-shape antennas. Under circularly polarized excitation at a specific wavelength, the L-shape antennas with rotating orientation angle act as spatially variant three-dimensional tilted dipoles and are able to generate desire phase delay for different polarization components. Generalized Snell's law is achieved for both in-plane and out-of-plane dipole components through arranging such L-shape antennas into arrays. These three-dimensional metasurfaces suggest a route for wavefront modulation and a variety of nanophotonic applications. AU - Li, Tianyou AU - Chen, Yanjie AU - Wang, Yongtian AU - Zentgraf, Thomas AU - Huang, Lingling ID - 43421 IS - 14 JF - Applied Physics Letters KW - Physics and Astronomy (miscellaneous) SN - 0003-6951 TI - Three-dimensional dipole momentum analog based on L-shape metasurface VL - 122 ER - TY - CONF AU - Yigitbas, Enes AU - Nowosad, Alexander AU - Engels, Gregor ID - 43424 T2 - Proceedings of the 19th IFIP TC13 International Conference on Human-Computer Interaction (INTERACT 2023) TI - Supporting Construction and Architectural Visualization through BIM and AR/VR: A Systematic Literature Review ER - TY - CONF AU - Demir, Caglar AU - Ngonga Ngomo, Axel-Cyrille ID - 43436 KW - dice enexa sail SFB-TRR 318 demir ngonga T2 - Advances in Intelligent Data Analysis XXI: 21st International Symposium on Intelligent Data Analysis, IDA 2023, Louvain-la-Neuve, Belgium, April 12–14, 2023, Proceedings TI - Learning Permutation-Invariant Embeddings for Description Logic Concepts ER - TY - JOUR AB - Lightweight design is a common approach to reduce energy demand in the use stage of vehicles. The production of lightweight materials is usually associated with an increase in energy demand, so the environmental impacts of lightweight structures need to be assessed holistically using a life cycle assessment. To estimate the life cycle environmental impacts of a product in its developmental stage, for example, by life cycle engineering, future changes in relevant influencing factors must be considered. Prospective life cycle assessment provides methods for integrating future scenarios into life cycle assessment studies. However, approaches for integrating prospective life cycle assessment into product development are limited. The objective of this work is to provide the methodological foundation for integrating future scenarios of relevant influencing factors in the development of lightweight structures. The applicability of the novel methodology is demonstrated by a case study of a structural component in a steel, aluminium, and hybrid design. The results show that appropriate decarbonisation measures can reduce the life cycle greenhouse gas emissions by up to 95 percent until 2050. We also found that shifts in the environmentally optimal design are possible in future scenarios. Therefore, the methodology and data provided contribute to improved decision-making in product development. AU - Ostermann, Moritz AU - Grenz, Julian AU - Triebus, Marcel AU - Cerdas, Felipe AU - Marten, Thorsten AU - Tröster, Thomas AU - Herrmann, Christoph ID - 43464 IS - 8 JF - Energies KW - Life Cycle Engineering KW - Life Cycle Assessment KW - Lightweight Design KW - Prospective LCA KW - Future-oriented LCA KW - Energy System KW - Material production KW - Sustainable production SN - 1996-1073 TI - Integrating Prospective Scenarios in Life Cycle Engineering: Case Study of Lightweight Structures VL - 16 ER - TY - JOUR AU - Biehler, Rolf AU - Liebendörfer, Michael AU - Schmitz, A. ID - 43504 JF - Mitteilungen der Gesellschaft für Didaktik der Mathematik TI - Lernvideos und ihre Erstellung - Das Projekt studiVEMINTvideos VL - 114 ER - TY - CHAP AU - Herzig, Bardo ED - Aßmann, S. ED - Ricken, N. ID - 44049 SN - 978-3-658-30765-3 T2 - Bildung und Digitalität. Analysen - Diskurse - Perspektiven TI - Digitalität, Mediatisierung und Bildung - Megatrends aus medienpädagogischer Perspektive ER - TY - JOUR AU - Herzig, Bardo ID - 44052 IS - 1 JF - Pädagogische Rundschau. Sackgasse oder Meilenstein? Zur Sinnhaftigkeit von Modellbildungen in der Erziehungswissenschaft SN - 0030-9273 TI - Modellbildung und Modellnutzung in der Allgemeinen Didaktik ER - TY - CONF AU - Büker, Petra ID - 44047 TI - Kinderstärkende Pädagogik in der Grundschule im Kontext (post-)pandemischer Herausforderungen. Kennzeichen, Kritische Anfragen und Blinde Flecke. Vortrag an der Tagung: Was Resilienz stärkt. Chancen und Risiken eines immer populärer werdenden Konzepts. Pädagogische Hochschule Heidelberg. ER - TY - CONF AU - Büker, Petra AU - Herding, Jana AU - Drexler, Leonie ID - 44046 TI - KrafT: Bildungsdokumentation in der inklusiven Schule partizipativ gestalten. 9. Paderborner Grundschultag zum Thema: „Demokratie Lernen von Anfang an“. Online ER - TY - JOUR AB - A relatively small body of research has been conducted on the near- and long-term effects of study abroad (SA) to date. This existing research suggests that SA effects on language skills tend to be volatile, while the impact on various aspects of learners’ personal, academic, and professional development may be longer-lasting. Yet, learner perspectives on the dynamics and durability of such effects, in particular in the context of short-term SA programs, remain largely unexplored. This study hence investigates the near-term impact of short-term SA programs as experienced by students within the first months and years following their sojourns. A qualitative case-study design is employed to examine the accounts of four American students of German, who studied abroad in Austria for four weeks and were interviewed repeatedly over a period of up to 40 months after their sojourns. The results suggest that, from the students’ perspective, many effects deteriorate in the near term, although the overall sojourn experience still appears influential. Abstract in German Nur wenige Forschungsvorhaben haben sich bislang den mittel- bis langfristigen Auswirkungen studentischer Auslandsaufenthalte gewidmet; die bisherige Datenlage deutet jedoch darauf hin, dass die Auswirkungen auf sprachliche Kompetenzen eher unbeständig sind, wohingegen die persönliche, studiums- und berufsbezogene Entwicklung der Lernenden länger von einem Auslandsaufenthalt beeinflusst wird. Die Dynamik und Beständigkeit derartiger Auswirkungen wurden jedoch kaum mit Blick auf kurze Auslandsaufenthalte (≤ acht Wochen) sowie aus der Perspektive der Studierenden erforscht, was die vorliegende Studie insbesondere hinsichtlich mittelfristiger Effekte fokussiert. Mittels eines qualitativen Fallstudiendesigns werden die Interviewdaten vier amerikanischer Deutschlernender untersucht, die sich vier Wochen in Österreich aufhielten und in einem Zeitraum von bis zu 40 Monaten nach ihrem Aufenthalt wiederholt befragt wurden. Die Ergebnisse zeigen, dass viele Auswirkungen eines solchen Aufenthalts aus studentischer Perspektive mittelfristig verblassen, auch wenn der Auslandsaufenthalt im Gesamten weiterhin als einflussreiche Erfahrung wahrgenommen wird. AU - Müller, Mareike ID - 44058 IS - 1 JF - Frontiers: The Interdisciplinary Journal of Study Abroad SN - 2380-8144 TI - Near-Term Effects of Short-Term Study Abroad: A Longitudinal Examination of Learner Perceptions VL - 35 ER - TY - CONF AU - Zeipert, Henning AU - von Germeten, Christian AU - Friesen, Olga AU - Claes, Leander AU - Johannesmann, Sarah AU - Henning, Bernd ID - 43233 T2 - Fortschritte der Akustik - DAGA 2023 TI - Investigation of change in dispersive behaviour during adhesive curing in multi-layered structures ER - TY - CONF AU - Claes, Leander ID - 43229 T2 - Fortschritte der Akustik - DAGA 2023 TI - Bestimmung der Volumenviskosität mittels akustischer Absorptionsmessung ER - TY - CONF AU - Nicolai, Marcel AU - Zeipert, Henning AU - Lugovtsova, Yevgeniya AU - Bulling, Jannis AU - Johannesmann, Sarah AU - Prager, Jens AU - Henning, Bernd ID - 43234 T2 - Fortschritte der Akustik - DAGA 2023 TI - Characterization of adhesion strength using guided ultrasonic waves ER - TY - BOOK AB - Durch Digitalisierung und Digitalität entstehen neue Fragestellungen für die formale und non-formale Bildung. Insbesondere die Professionalisierung von Lehrkräften und Fachpersonal steht durch die Dynamik der technologischen und kulturellen Entwicklungen vor weitreichenden Herausforderungen. Der vorliegende Band beschäftigt sich mit der Frage der Professionalisierung von Grundschullehrkräften und pädagogischen Fachkräften für eine Digitale Bildung im Grundschulalter und ist auf der Grundlage des BMBF-Projekts Primat des Pädagogischen in der Digitalen Grundbildung – Grundsatzfragen und Gelingensbedingungen in der Professionalisierung von pädagogischen Akteur:innen für Kinder im Grundschulalter, P3DiG, entstanden. Im ersten Teil des Sammelbandes werden Grundlagen der Professionalisierung für eine Digitale Grundbildung dargelegt. Im zweiten Teil werden die Ergebnisse des Projekts präsentiert. Dabei werden sowohl Professionalisierungsmodelle für eine Digitale Grundbildung als auch die Ergebnisse der im Projekt durchgeführten empirischen Untersuchungen zur Digitalen Grundbildung im Grundschulalter vorgestellt. Der Band kann damit als Grundlage für die Ausarbeitung von Professionalisierungskonzepten in Hochschulen, Seminaren und Weiterbildungseinrichtungen dienen und liefert Impulse für die weitere wissenschaftliche Auseinandersetzung. ED - Irion, Thomas ED - Böttinger, Traugott ED - Kammerl, Rudolf ID - 43390 SN - 9783830946410 TI - Professionalisierung für Digitale Bildung im Grundschulalter. Ergebnisse des Forschungsprojekts P³DiG ER - TY - THES AU - Badalov, Sabuhi ID - 43829 TI - Modelling electron exchange and correlation for catalyst electronic structure simulations ER - TY - JOUR AU - De, Jianbo AU - Ma, Xuekai AU - Yin, Fan AU - Ren, Jiahuan AU - Yao, Jiannian AU - Schumacher, Stefan AU - Liao, Qing AU - Fu, Hongbing AU - Malpuech, Guillaume AU - Solnyshkov, Dmitry ID - 36416 IS - 3 JF - Journal of the American Chemical Society (JACS) KW - Colloid and Surface Chemistry KW - Biochemistry KW - General Chemistry KW - Catalysis SN - 0002-7863 TI - Room-Temperature Electrical Field-Enhanced Ultrafast Switch in Organic Microcavity Polariton Condensates VL - 145 ER - TY - JOUR AU - Jia, Jichao AU - Cao, Xue AU - Ma, Xuekai AU - De, Jianbo AU - Yao, Jiannian AU - Schumacher, Stefan AU - Liao, Qing AU - Fu, Hongbing ID - 35160 IS - 1 JF - Nature Communications KW - General Physics and Astronomy KW - General Biochemistry KW - Genetics and Molecular Biology KW - General Chemistry KW - Multidisciplinary SN - 2041-1723 TI - Circularly polarized electroluminescence from a single-crystal organic microcavity light-emitting diode based on photonic spin-orbit interactions VL - 14 ER - TY - JOUR AU - Rose, Hendrik AU - Vasil'ev, A. N. AU - Tikhonova, O. V. AU - Meier, Torsten AU - Sharapova, Polina ID - 37280 IS - 1 JF - Physical Review A SN - 2469-9926 TI - Quantum-optical excitations of semiconductor nanostructures in a microcavity using a two-band model and a single-mode quantum field VL - 107 ER - TY - GEN AU - Gunasagran, Sharin Kumar AU - Neukötter, Moritz ID - 44100 TI - Automatisierung der Auswertung rheologischer Messungen (Studienarbeit) ER - TY - GEN AU - Neukötter, Moritz AU - Jesinghausen, Steffen AU - Schmid, Hans-Joachim ID - 44102 TI - Instabilities of Polymer Melt Suspensions under Uniaxial Extension (Poster) ER - 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 - 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 -