TY - CHAP AU - Vogelsang, Christoph AU - Al-Kabbani, Daniel ED - Heuchemer, Sylvia ED - van Treeck, Timo ED - Szczyrba, Birgit ID - 35666 T2 - Hochschuldidaktik als Akteurin der Hochschulentwicklung TI - "Jetzt auch noch Werte vermitteln?" - Potentiale und Grenzen der Adaption schuldidaktischer Werkzeuge in der Hochschuldidaktik zur Integration von Wertefragen in die Hochschullehre ER - TY - CHAP AU - Görel, Gamze AU - Finke, Nils AU - Hellmich, Frank ED - Skorsetz, Nina ED - Bonanati, Marina ED - Kucharz, Diemut ID - 26631 SN - 978-3-658-27528-0 T2 - Diversität und soziale Ungleichheit. Jahrbuch Grundschulforschung TI - Sichtweisen von Grundschullehrkräften auf die Qualität inklusiven Unterrichts ER - TY - JOUR AB - The development of renewable energies and smart mobility has profoundly impacted the future of the distribution grid. An increasing bidirectional energy flow stresses the assets of the distribution grid, especially medium voltage switchgear. This calls for improved maintenance strategies to prevent critical failures. Predictive maintenance, a maintenance strategy relying on current condition data of assets, serves as a guideline. Novel sensors covering thermal, mechanical, and partial discharge aspects of switchgear, enable continuous condition monitoring of some of the most critical assets of the distribution grid. Combined with machine learning algorithms, the demands put on the distribution grid by the energy and mobility revolutions can be handled. In this paper, we review the current state-of-the-art of all aspects of condition monitoring for medium voltage switchgear. Furthermore, we present an approach to develop a predictive maintenance system based on novel sensors and machine learning. We show how the existing medium voltage grid infrastructure can adapt these new needs on an economic scale. AU - Hoffmann, Martin W. AU - Wildermuth, Stephan AU - Gitzel, Ralf AU - Boyaci, Aydin AU - Gebhardt, Jörg AU - Kaul, Holger AU - Amihai, Ido AU - Forg, Bodo AU - Suriyah, Michael AU - Leibfried, Thomas AU - Stich, Volker AU - Hicking, Jan AU - Bremer, Martin AU - Kaminski, Lars AU - Beverungen, Daniel AU - zur Heiden, Philipp AU - Tornede, Tanja ID - 35723 IS - 7 JF - Sensors KW - Electrical and Electronic Engineering KW - Biochemistry KW - Instrumentation KW - Atomic and Molecular Physics KW - and Optics KW - Analytical Chemistry SN - 1424-8220 TI - Integration of Novel Sensors and Machine Learning for Predictive Maintenance in Medium Voltage Switchgear to Enable the Energy and Mobility Revolutions VL - 20 ER - TY - GEN ED - Fechner, Sabine ED - Verhoeff, Roald ID - 35618 TI - Science Teaching Processes (strand 3). In Levrini, O. & Tasquier, G. (eds.), The beauty and pleasure of understanding: engaging with contemporary challenges through science education. Electronic Proceedings of the ESERA 2019 Conference. ER - TY - JOUR AU - Scheer, D. AU - Egener, L. AU - Laubenstein, Désirée AU - Melzer, C. ID - 35770 JF - In: International Journal of Inclusive Education TI - Development and psychometric evaluation of an instrument measuring subjective definitions of inclusion (FEDI). International Journal of Inclusive Education. ER - TY - JOUR AU - Stenzel, Nadja ID - 35796 JF - DaZ Sekundarstufe: Deutsch als Zweitsprache - Konzepte und Materialien TI - Verknüpfung von Fach- und Sprachlernen im Textilunterricht – Ein Anleitung zur Technik Weben schreiben ER - TY - CONF AU - Biehler, Rolf AU - Fleischer, Yannik AU - Budde, Lea AU - Frischemeier, Daniel AU - Gerstenberger, Dietrich AU - Podworny, Susanne AU - Schulte, Carsten ED - Arnold, P. ID - 35814 T2 - New Skills in the Changing World of Statistics Education Proceedings of the Roundtable conference of the International Association for Statistical Education (IASE) TI - Data science education in secondary schools: Teaching and learning decision trees with CODAP and Jupyter Notebooks as an example of integrating machine learning into statistics education ER - TY - JOUR AB - Block copolymer (BCP) self-assembly is a promising tool for next generation lithography as microphase separated polymer domains in thin films can act as templates for surface nanopatterning with sub-20 nm features. The replicated patterns can, however, only be as precise as their templates. Thus, the investigation of the morphology of polymer domains is of great importance. Commonly used analytical techniques (neutron scattering, scanning force microscopy) either lack spatial information or nanoscale resolution. Using advanced analytical (scanning) transmission electron microscopy ((S)TEM), we provide real space information on polymer domain morphology and interfaces between polystyrene (PS) and polymethylmethacrylate (PMMA) in cylinder- and lamellae-forming BCPs at highest resolution. This allows us to correlate the internal structure of polymer domains with line edge roughnesses, interface widths and domain sizes. STEM is employed for high-resolution imaging, electron energy loss spectroscopy and energy filtered TEM (EFTEM) spectroscopic imaging for material identification and EFTEM thickness mapping for visualisation of material densities at defects. The volume fraction of non-phase separated polymer species can be analysed by EFTEM. These methods give new insights into the morphology of polymer domains the exact knowledge of which will allow to improve pattern quality for nanolithography. AU - Bürger, Julius AU - Kunnathully, Vinay AU - Kool, Daniel AU - Lindner, Jörg AU - Brassat, Katharina ID - 34092 IS - 1 JF - Nanomaterials KW - General Materials Science KW - General Chemical Engineering SN - 2079-4991 TI - Characterisation of the PS-PMMA Interfaces in Microphase Separated Block Copolymer Thin Films by Analytical (S)TEM VL - 10 ER - TY - JOUR AU - Riedl, Thomas AU - Kunnathully, V. S. AU - Trapp, A. AU - Langer, T. AU - Reuter, Dirk AU - Lindner, Jörg ID - 34093 IS - 1 JF - Physical Review Materials KW - Physics and Astronomy (miscellaneous) KW - General Materials Science SN - 2475-9953 TI - Strain-driven InAs island growth on top of GaAs(111) nanopillars VL - 4 ER - TY - JOUR AU - Bürger, Julius AU - Riedl, Thomas AU - Lindner, Jörg ID - 34088 JF - Ultramicroscopy KW - Instrumentation KW - Atomic and Molecular Physics KW - and Optics KW - Electronic KW - Optical and Magnetic Materials SN - 0304-3991 TI - Influence of lens aberrations, specimen thickness and tilt on differential phase contrast STEM images VL - 219 ER - TY - CHAP AB - Digitalisierung ist derzeit ein viel diskutiertes Thema. Mit ihr werden derart tief grei- fende Veränderungen der Gesellschaft und Arbeitswelt erwartet, dass sie häufig als digitale Revolution bezeichnet wird. Gleichzeitig wirft die Auseinandersetzung mit diesen antizipierten Veränderungen viele noch unbeantwortete Fragen auf. Diese umfassen unter anderem Überlegungen hinsichtlich des Substitutionspotenzials menschlicher Arbeit durch die Digitalisierung, die Frage nach der Ausgestaltung der Rolle des Menschen in der Industrie 4.0 und schließlich Erwägungen in Bezug auf die Vorbereitung und Begleitung von Beschäftigten in der digitalen Transformation. Der vorliegende Beitrag gibt Aufschluss über die Dimensionen der Digitalisierung und die derzeit diskutierten Entwicklungslinien; er befasst sich weiterhin mit den sich daraus ergebenden Herausforderungen und Bedeutungen für die industrielle Arbeit und die Beschäftigten. Abschließend werden daraus abzuleitende Implikationen für die berufliche und allgemeine Bildung diskutiert. AU - Berisha-Gawlowski, Angelina AU - Caruso, Carina AU - Goller, Michael AU - Harteis, Christian ED - Heisler, Dietmar ED - Meier, Jörg ID - 35836 KW - Digitalisierung KW - Industrie 4.0 KW - Arbeit 4.0 KW - berufliche Aus- und Weiterbildung KW - allgemeine Bildung / digitalization KW - industry 4.0 KW - work 4.0 KW - vocational education and training KW - general education SN - 978-3-7639-6158-0 T2 - Digitalisierung am Übergang Schule Beruf Ansätze und Perspektiven in Arbeitsdomänen und beruflicher Förderung TI - Auswirkungen der Digitalisierung industrieller Arbeit auf die berufliche und allgemeine Bildung VL - 56 ER - TY - JOUR AU - Kunnathully, Vinay S. AU - Riedl, Thomas AU - Trapp, Alexander AU - Langer, Timo AU - Reuter, Dirk AU - Lindner, Jörg ID - 34091 JF - Journal of Crystal Growth KW - Materials Chemistry KW - Inorganic Chemistry KW - Condensed Matter Physics SN - 0022-0248 TI - InAs heteroepitaxy on nanopillar-patterned GaAs (111)A VL - 537 ER - TY - JOUR AU - Riedl, Thomas AU - Lindner, Jörg ID - 34090 JF - Solid State Communications KW - Materials Chemistry KW - Condensed Matter Physics KW - General Chemistry SN - 0038-1098 TI - Applicability of molecular statics simulation to partial dislocations in GaAs VL - 314-315 ER - TY - JOUR AU - Riedl, Thomas AU - Lindner, Jörg ID - 34089 JF - Solid State Communications KW - Materials Chemistry KW - Condensed Matter Physics KW - General Chemistry SN - 0038-1098 TI - Applicability of molecular statics simulation to partial dislocations in GaAs VL - 314-315 ER - TY - CONF AB - Novel analog-to-digital converter (ADC) architectures are motivated by the demand for rising sampling rates and effective number of bits (ENOB). The main limitation on ENOB in purely electrical ADCs lies in the relatively high jitter of oscillators, in the order of a few tens of fs for state-of-the-art components. When compared to the extremely low jitter obtained with best-in-class Ti:sapphire mode-locked lasers (MLL), in the attosecond range, it is apparent that a mixed electrical-optical architecture could significantly improve the converters' ENOB. We model and analyze the ENOB limitations arising from optical sources in optically enabled, spectrally sliced ADCs, after discussing the system architecture and implementation details. The phase noise of the optical carrier, serving for electro-optic signal transduction, is shown not to propagate to the reconstructed digitized signal and therefore not to represent a fundamental limit. The optical phase noise of the MLL used to generate reference tones for individual slices also does not fundamentally impact the converted signal, so long as it remains correlated among all the comb lines. On the other hand, the timing jitter of the MLL, as also reflected in its RF linewidth, is fundamentally limiting the ADC performance, since it is directly mapped as jitter to the converted signal. The hybrid nature of a photonically enabled, spectrally sliced ADC implies the utilization of a number of reduced bandwidth electrical ADCs to convert parallel slices, resulting in the propagation of jitter from the electrical oscillator supplying their clock. Due to the reduced sampling rate of the electrical ADCs, as compared to the overall system, the overall noise performance of the presented architecture is substantially improved with respect to a fully electrical ADC. AU - Zazzi, Andrea AU - Müller, Juliana AU - Gudyriev, Sergiy AU - Marin-Palomo, Pablo AU - Fang, Dengyang AU - Scheytt, Christoph AU - Koos, Christian AU - Witzens, Jeremy ID - 24020 T2 - 21. ITG-Fachtagung Photonische Netze TI - Mode-locked laser timing jitter limitation in optically enabled frequency-sliced ADCs ER - TY - JOUR AB - The effect of phase noise introduced by optical sources in spectrally-sliced optically enabled DACs and ADCs is modeled and analyzed in detail. In both data converter architectures, a mode-locked laser is assumed to provide an optical comb whose lines are used to either synthesize or analyze individual spectral slices. While the optical phase noise of the central MLL line as well as of other optical carriers used in the analyzed system architectures have a minor impact on the system performance, the RF phase noise of the MLL fundamentally limits it. In particular, the corresponding jitter of the MLL pulse train is transferred almost one-to-one to the system-level timing jitter of the data converters. While MLL phase noise can in principle be tracked and removed by electronic signal processing, this results in electric oscillator phase noise replacing the MLL jitter and is not conducive in systems leveraging the ultra-low jitter of low-noise mode-locked lasers. Precise analytical models are derived and validated by detailed numerical simulations. AU - Zazzi, Andrea AU - Müller, Juliana AU - Gudyriev, Sergiy AU - Marin-Palomo, Pablo AU - Fang, Dengyang AU - Scheytt, Christoph AU - Koos, Christian AU - Witzens, Jeremy ID - 24025 JF - Opt. Express TI - Fundamental limitations of spectrally-sliced optically enabled data converters arising from MLL timing jitter VL - 28 ER - TY - CONF AB - A 28 Gbps NRZ bang-bang clock and data recovery (CDR) chip for 100G PSM4 is presented. It exhibits an adaptable loop filter transfer function with independently tunable proportional and integral parameters. This allows to optimize the jitter transfer, jitter tolerance, and locking range of the CDR according to system requirements. The CDR represents a key component for a single-chip 8-channel electronic-photonic PSM4 transceiver. A CDR chip was manufactured in a 0.25 μm monolithic photonic BiCMOS technology. The core chip area is 0.51 mm 2 and it dissipates 330 mW from 2.5 V and 3.3 V power supplies. AU - Iftekhar, Mohammed AU - Gudyriev, Sergiy AU - Scheytt, Christoph ID - 24028 T2 - 2020 IEEE 20th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) TI - 28 Gbps Bang-Bang CDR for 100G PSM4 with Independently Tunable Proportional and Integral Parameters of the Loop Filter in 0.25 µm Photonic BiCMOS Technology ER - TY - CONF AB - In this paper we present a new system concept for an optoelectronic wireless phased array system. Like in a conventional phased array system with optical carrier distribution, optical fibers are used to distribute the carrier from the basestation to the wireless frontends. However in contrast to prior concepts, we propose to use an optical IQ return path from the wireless frontends back to the basestation. Furthermore, we reuse the optical carrier signal for the IQ return path which allows to avoid local oscillator lasers in the wireless frontends and reduces the hardware effort significantly. The system concept allows to integrate all components of an optoelectronic wireless frontend in a single chip using silicon photonics technology. AU - Kruse, Stephan AU - Kress, Christian AU - Scheytt, Christoph AU - Kurz, Heiko G. AU - Schneider, Thomas ID - 24026 T2 - GeMiC 2020 - German Microwave Conference TI - Analysis and Simulation of a Wireless Phased Array System with Optical Carrier Distribution and an Optical IQ Return Path ER - TY - JOUR AU - Atorf, Bernhard AU - Mühlenbernd, Holger AU - Zentgraf, Thomas AU - Kitzerow, Heinz-Siegfried ID - 16301 IS - 6 JF - Optics Express SN - 1094-4087 TI - All-optical switching of a dye-doped liquid crystal plasmonic metasurface VL - 28 ER - TY - CONF AB - Recently it has been demonstrated that an optoelectronic phase-locked loop (OEPLL) using a mode-locked laser as a reference oscillator achieves significantly lower phase noise than conventional electronic frequency synthesizers. In this paper a concept for an OEPLL-based frequency synthesizer is presented and it is investigated how it can be used as a local oscillator (LO) for THz transceivers in order to improve the signal quality in THz wireless communications. The concept of the OEPLL is presented and it's measured phase noise is compared to the phase noise of a laboratory-grade electronic frequency synthesizer. The measured phase noise spectra of both synthesizers at 10 GHz are then used to model LO phase noise at 320 GHz. Based on models of generic zero-IF transmit and receive frontends, THz signals with different modulation formats and Baud rates are simulated at system level using the modeled LO phase noise for the two LO approaches. Finally, the results are compared. AU - Scheytt, Christoph AU - Wrana, Dominik AU - Bahmanian, Meysam AU - Kallfass, Ingmar ID - 24024 T2 - 2020 Third International Workshop on Mobile Terahertz Systems (IWMTS) TI - Ultra-Low Phase Noise Frequency Synthesis for THz Communications Using Optoelectronic PLLs ER -