TY - CONF AB - Abstract. Climate change, rare resources and industrial transformation processes lead to a rising demand of multi-complex lightweight forming parts, especially in aerospace and automotive sectors. In these industries, flow forming is often used to produce cylindrical forming parts by reducing the wall thickness of tubular semifinished parts, e.g. for the production of hydraulic cylinders or gear shafts. The complexity and functionality of flow forming workpieces could be significantly increased by locally graded microstructure and geometry structures. This enables customized complex hardness distributions at wear surfaces or magnetic QR codes for a unique, tamper-proof product identification. The production of those complex, 2D (axial and angular) graded forming parts currently depicts a great challenge for the process and requires new solutions and strategies. Hence, this paper proposes a novel control strategy that includes online measurements from an absolute encoder to determine the angular workpiece position. Workpieces of AISI 304L stainless steel with 2D-graded structures are successfully manufactured using this new strategy and analyzed regarding the possible accuracy and resolution of the gradation. At this point, a dependency of the gradations on the sensor and actuator dynamics, accuracy and geometry could be noted. It is further evaluated how the control strategy could be extended by an observer-based closed-loop property control approach to enhance the accuracy of the suggested strategy. AU - Kersting, Lukas AU - Arian, Bahman AU - Rozo Vasquez, Julian AU - Trächtler, Ansgar AU - Homberg, Werner AU - Walther, Frank ID - 44315 SN - 2474-395X T2 - Materials Research Proceedings TI - Control strategy for angular gradations by means of the flow forming process ER - TY - CHAP AU - Newberry, Melissa AU - Rizvi, Meher AU - van der Want, Anna AU - Jonas-Ahrend, Gabriela AU - Kaldi, Stavroula AU - Kihara, Toshiyuki AU - Franco, Juan Vicente Ortiz AU - Ratnam, Tara ID - 45652 SN - 1479-3687 T2 - Advances in Research on Teaching TI - Teacher Educators' Experiences and Expressions of Emotion During the Pandemic: International Perspectives ER - TY - JOUR AU - Rozo Vasquez, Julian AU - Arian, Bahman AU - Kersting, Lukas AU - Walther, Frank AU - Homberg, Werner AU - Trächtler, Ansgar ID - 44318 JF - Metals TI - Detection of phase transformation during plastic deformation of metastable austenitic steel AISI 304L by means of X-ray diffraction pattern analysis ER - TY - GEN AU - Thorenz, Kristin AU - Berwinkel, Andre AU - Weigelt, Matthias ED - Schlesinger, Torsten ED - Grimminger-Seidensticker, Elke ED - Ferrauti, Alexander ED - Kellmann, Michael ED - Thiel, Christian ED - Kullik, Lisa ID - 47418 SN - 978-3-88020-714-1 T2 - Leistung steuern. Gesundheit stärken. Entwicklung fördern. TI - The affective response following autogenic training VL - 301 ER - TY - CHAP AU - Biehler, Rolf AU - Engel, Joachim AU - Frischemeier, Daniel ED - Bruder, Regina ED - Büchter, A. ED - Gasteiger, H. ED - Schmidt-Thieme, B. ED - Weigand, HG. ID - 47416 SN - 9783662666036 T2 - Handbuch der Mathematikdidaktik TI - Stochastik: Leitidee Daten und Zufall ER - TY - JOUR AU - Methfessel, Annette AU - Janzen, Thomas ID - 47423 IS - 2 JF - Englisch betrifft uns TI - Living the Dream? Relating to the living conditions of Hispanic migrants in California through the short story Inside Out ER - TY - CHAP AU - Rezat, Sara ED - von Heynitz, Martina ID - 47450 T2 - Die Konstruktion stärken: Ein Handlungsfeld der Deutschdidaktik neu betrachtet TI - Konstruktionen in der prozedurenorientierten Schreibdidaktik. ER - TY - JOUR AU - Rezat, Sara AU - Scholle, Oliver ID - 47451 IS - (1) JF - Medien im Deutschunterricht TI - AnnoPy – Ein digitales Tool zur Förderung von Textkompetenzen. VL - 5 ER - TY - CONF AB - In this paper we present a new system architecture for software-defined radio / radar with optical signal distribution. The proposed architecture allows to transmit the optical carrier and an arbitrary IQ signal on the same fiber from a base station to wireless transmitters using a single laser. Furthermore, we can reuse parts, and under special conditions, also the complete optical output of the base station for the IQ return path from the wireless receiver frontends to the base station. Avoiding multiple lasers and fibers for the distribution of the carrier and arbitrary signal from the base station to the frontend, and avoiding the laser diode for the IQ return path from receiver frontends to the base station reduces the hardware effort significantly. Finally, the system architecture allows to integrate all components of the optoelectronic wireless frontend in a single chip using silicon photonics technology. AU - Kruse, Stephan AU - Kneuper, Pascal AU - Schwabe, Tobias AU - Meinecke, Marc-Michael AU - Kurz, Heiko G. AU - Scheytt, J. Christoph ID - 42800 TI - Distributed System Architecture for Software-Defined Radio / Radar with Optical Signal Distribution ER - TY - JOUR AU - Kruse, Stephan AU - Greitens, Jan C. AU - Schwabe, Tobias AU - Kneuper, Pascal AU - Kurz, Heiko G. AU - Scheytt, J. Christoph ID - 47126 JF - IEEE Microwave and Wireless Technology Letters TI - A Narrowband Four-Quadrant Electro-Optical Mixer for Microwave Photonics ER - TY - CONF AB -

The study investigates two different ways of guiding the addressee of an explanation - an explainee, through action demonstration: contrastive and non-contrastive. Their effect was tested on attention to specific action elements (goal) as well as on event memory. In an eye-tracking experiment, participants were shown different motion videos that were either contrastive or non-contrastive with respect to the segments of movement presentation. Given that everyday action demonstration is often multimodal, the stimuli were created with re- spect to their visual and verbal presentation. For visual presentation, a video combined two movements in a contrastive (e.g., Up-motion following a Down-motion) or non-contrastive way (e.g., two Up-motions following each other). For verbal presentation, each video was combined with a sequence of instruction descriptions in the form of negative (i.e., contrastive) or assertive (i.e., non-contrastive) guidance. It was found that a) attention to the event goal increased for this condition in the later time window, and b) participants’ recall of the event was facilitated when a visually contrastive motion was combined with a verbal contrast.

AU - Singh, Amit AU - Rohlfing, Katharina J. ID - 46067 KW - Attention KW - negation KW - contrastive guidance KW - eye-movements KW - action understanding KW - event representation T2 - Proceedings of the Annual Meeting of the Cognitive Science Society 45 (45) TI - Contrastiveness in the context of action demonstration: an eye-tracking study on its effects on action perception and action recall ER - TY - CONF AB - This paper experimentally investigates and interprets the e®ects of noise and non- linearity in a silicon photonic optical test structure. For the analysis di®erent optoelectronic phase noise measurement techniques are used. Our tests focuses on the performance of integrated opti- cal test structures using femtosecond pulses in the 1550nm spectral range. A primary objective is to understand the behaviour of silicon photonic waveguides that can be further employed in the implementation of an optoelectronic phase-locked loop (OEPLL) in silicon photonics technology. A comparison of our results, as well as a discussion on the di®erent optoelectronic phase noise measurement techniques are presented. Our ¯ndings provide insights that can be leveraged to optimize the design and performance of ultra-low phase noise on-chip OEPLL systems locking to mode-locked laser (MLL) signals. In the future such systems can be essential for advanced communication and sensing applications. AU - Surendranath Shroff, Vijayalakshmi AU - Kress, Christian AU - Bahmanian, Meysam AU - Scheytt, J. Christoph ID - 47521 T2 - 2023 PhotonIcs & Electromagnetics Research Symposium (PIERS), TI - Analysis of Phase Noise in Waveguide-integrated Optical Test Structures in Silicon Photonics ER - TY - JOUR AU - Kürpick, Christian AU - Rasor, Anja AU - Scholtysik, Michel AU - Kühn, Arno AU - Koldewey, Christian AU - Dumitrescu, Roman ID - 47420 JF - Procedia CIRP KW - General Medicine SN - 2212-8271 TI - An Integrative View of the Transformations towards Sustainability and Digitalization: The Case for a Dual Transformation VL - 119 ER - TY - JOUR AU - Zhai, Xiaokun AU - Ma, Xuekai AU - Gao, Ying AU - Xing, Chunzi AU - Gao, Meini AU - Dai, Haitao AU - Wang, Xiao AU - Pan, Anlian AU - Schumacher, Stefan AU - Gao, Tingge ID - 40274 IS - 13 JF - Physical Review Letters TI - Electrically controlling vortices in a neutral exciton polariton condensate at room temperature VL - 131 ER - TY - GEN AU - Sehlmeyer, Birte AU - Kampmann, Rebecca AU - Scheidemann, Claus AU - Hemsel, Tobias AU - Getzlaff, Mathias ID - 47234 T2 - Frühjahrstagung 2023, Sektion Kondensierte Materie (SKM) TI - Burst Mode of Ultrasonic Resonant Oscillations for Stimulation and Destruction of Tumor Cells ER - TY - GEN AU - Kampmann, Rebecca AU - Sehlmeyer, Birte AU - Scheidemann, Claus AU - Hemsel, Tobias AU - Getzlaff, Mathias ID - 47235 T2 - Frühjahrstagung 2023, Sektion Kondensierte Marterie (SKM) TI - Burst Mode Characteristics of an Ultrasonic Transducer for Treatment of Cancer Cells ER - TY - GEN AB - In planar microcavities, the transverse-electric and transverse-magnetic (TE-TM) mode splitting of cavity photons arises due to their different penetration into the Bragg mirrors and can result in optical spin-orbit coupling (SOC). In this work, we find that in a liquid crystal (LC) microcavity filled with perovskite microplates, the pronounced TE-TM splitting gives rise to a strong SOC that leads to the spatial instability of microcavity polariton condensates under single-shot excitation. Spatially varying hole burning and mode competition occurs between polarization components leading to different condensate profiles from shot to shot. The single-shot polariton condensates become stable when the SOC vanishes as the TE and TM modes are spectrally well separated from each other, which can be achieved by application of an electric field to our LC microcavity with electrically tunable anisotropy. Our findings are well reproduced and traced back to their physical origin by our detailed numerical simulations. With the electrical manipulation our work reveals how the shot-to-shot spatial instability of spatial polariton profiles can be engineered in anisotropic microcavities at room temperature, which will benefit the development of stable polariton-based optoeletronic and light-emitting devices. AU - Gao, Ying AU - Ma, Xuekai AU - Zhai, Xiaokun AU - Xing, Chunzi AU - Gao, Meini AU - Dai, Haitao AU - Wu, Hao AU - Liu, Tong AU - Ren, Yuan AU - Wang, Xiao AU - Pan, Anlian AU - Hu, Wei AU - Schumacher, Stefan AU - Gao, Tingge ID - 47532 T2 - arXiv:2305.01368 TI - Single-shot spatial instability and electric control of polariton condensates at room temperature ER - TY - GEN AB - The control and active manipulation of spin-orbit coupling (SOC) in photonic systems is fundamental in the development of modern spin optics and topological photonic devices. Here, we demonstrate the control of an artificial Rashba-Dresselhaus (RD) SOC mediated by photochemical reactions in a microcavity filled with an organic single-crystal of photochromic phase-change character. Splitting of the circular polarization components of the optical modes induced by photonic RD SOC is observed experimentally in momentum space. By applying an ultraviolet light beam, we control the spatial molecular orientation through a photochemical reaction and with that we control the energies of the photonic modes. This way we realize a reversible conversion of spin-splitting of the optical modes with different energies, leading to an optically controlled switching between circularly and linearly polarized emission from our device. Our strategy of in situ and reversible engineering of SOC induced by a light field provides a promising approach to actively design and manipulate synthetic gauge fields towards future on-chip integration in photonics and topological photonic devices. AU - Liang, Qian AU - Ma, Xuekai AU - Ren, Jiahuan AU - Long, Teng AU - Gu, Chunling AU - An, Cunbin AU - Fu, Hongbing AU - Schumacher, Stefan AU - Liao, Qing ID - 47533 T2 - arXiv:2309.07652 TI - Photochemical reaction enabling the engineering of photonic spin-orbit coupling in organic-crystal optical microcavities ER - TY - GEN AB - Topological states have been widely investigated in different types of systems and lattices. In the present work, we report on topological edge states in double-wave (DW) chains, which can be described by a generalized Aubry-Andr\'e-Harper (AAH) model. For the specific system of a driven-dissipative exciton polariton system we show that in such potential chains, different types of edge states can form. For resonant optical excitation, we further find that the optical nonlinearity leads to a multistability of different edge states. This includes topologically protected edge states evolved directly from individual linear eigenstates as well as additional edge states that originate from nonlinearity-induced localization of bulk states. Extending the system into two dimensions (2D) by stacking horizontal DW chains in the vertical direction, we also create 2D multi-wave lattices. In such 2D lattices multiple Su-Schrieffer-Heeger (SSH) chains appear along the vertical direction. The combination of DW chains in the horizontal and SSH chains in the vertical direction then results in the formation of higher-order topological insulator corner states. AU - Schneider, Tobias AU - Gao, Wenlong AU - Zentgraf, Thomas AU - Schumacher, Stefan AU - Ma, Xuekai ID - 47531 T2 - arXiv:2303.12593 TI - Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates ER - TY - GEN AB - Exceptional points (EPs) with their intriguing spectral topology have attracted considerable attention in a broad range of physical systems, with potential sensing applications driving much of the present research in this field. Here we theoretically demonstrate the realization of EPs in a system with significant nonlinearity, a non-equilibrium exciton-polariton condensate. With the possibility to control loss and gain and nonlinearity by optical means, this system allows for a comprehensive analysis of the interplay of nonlinearities (Kerr-type and saturable gain) and non-Hermiticity. Not only do we find that EPs can be intentionally shifted in parameter space by the saturable gain, we also observe intriguing rotations and intersections of Riemann surfaces, and find nonlinearity-enhanced sensing capabilities. Our results are quite general in nature and illustrate the potential of tailoring spectral topology and related phenomena in non-Hermitian systems by nonlinearity. AU - Wingenbach, Jan AU - Schumacher, Stefan AU - Ma, Xuekai ID - 47529 T2 - arXiv:2305.04855 TI - Tweaking Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems ER -