@article{34090, author = {{Riedl, Thomas and Lindner, Jörg}}, issn = {{0038-1098}}, journal = {{Solid State Communications}}, keywords = {{Materials Chemistry, Condensed Matter Physics, General Chemistry}}, publisher = {{Elsevier BV}}, title = {{{Applicability of molecular statics simulation to partial dislocations in GaAs}}}, doi = {{10.1016/j.ssc.2020.113927}}, volume = {{314-315}}, year = {{2020}}, } @article{34089, author = {{Riedl, Thomas and Lindner, Jörg}}, issn = {{0038-1098}}, journal = {{Solid State Communications}}, keywords = {{Materials Chemistry, Condensed Matter Physics, General Chemistry}}, publisher = {{Elsevier BV}}, title = {{{Applicability of molecular statics simulation to partial dislocations in GaAs}}}, doi = {{10.1016/j.ssc.2020.113927}}, volume = {{314-315}}, year = {{2020}}, } @inproceedings{24020, abstract = {{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.}}, author = {{Zazzi, Andrea and Müller, Juliana and Gudyriev, Sergiy and Marin-Palomo, Pablo and Fang, Dengyang and Scheytt, Christoph and Koos, Christian and Witzens, Jeremy}}, booktitle = {{21. ITG-Fachtagung Photonische Netze}}, publisher = {{VDE-Verlag}}, title = {{{Mode-locked laser timing jitter limitation in optically enabled frequency-sliced ADCs}}}, year = {{2020}}, } @article{24025, abstract = {{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.}}, author = {{Zazzi, Andrea and Müller, Juliana and Gudyriev, Sergiy and Marin-Palomo, Pablo and Fang, Dengyang and Scheytt, Christoph and Koos, Christian and Witzens, Jeremy}}, journal = {{Opt. Express}}, title = {{{Fundamental limitations of spectrally-sliced optically enabled data converters arising from MLL timing jitter}}}, doi = {{10.1364/OE.382832}}, volume = {{28}}, year = {{2020}}, } @inproceedings{24028, abstract = {{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.}}, author = {{Iftekhar, Mohammed and Gudyriev, Sergiy and Scheytt, Christoph}}, booktitle = {{2020 IEEE 20th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF)}}, publisher = {{IEEE}}, title = {{{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}}}, doi = {{10.1109/SIRF46766.2020.9040190}}, year = {{2020}}, } @article{16301, author = {{Atorf, Bernhard and Mühlenbernd, Holger and Zentgraf, Thomas and Kitzerow, Heinz-Siegfried}}, issn = {{1094-4087}}, journal = {{Optics Express}}, number = {{6}}, pages = {{8898--8908}}, title = {{{All-optical switching of a dye-doped liquid crystal plasmonic metasurface}}}, doi = {{10.1364/oe.383877}}, volume = {{28}}, year = {{2020}}, } @inproceedings{24024, abstract = {{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.}}, author = {{Scheytt, Christoph and Wrana, Dominik and Bahmanian, Meysam and Kallfass, Ingmar}}, booktitle = {{2020 Third International Workshop on Mobile Terahertz Systems (IWMTS)}}, location = {{Essen, Germany }}, title = {{{Ultra-Low Phase Noise Frequency Synthesis for THz Communications Using Optoelectronic PLLs}}}, doi = {{10.1109/IWMTS49292.2020.9166347}}, year = {{2020}}, } @misc{35929, author = {{Caruso, Carina}}, booktitle = {{ Das wissenschaftlich-religionspädagogische Lexikon im Internet}}, editor = {{Zimmermann, Mirjam and Lindler, Heike}}, title = {{{Praxissemester }}}, year = {{2020}}, } @article{35935, author = {{Caruso, Carina}}, journal = {{katholisch.de, Kolumne „Mein Religionsunterricht“. }}, title = {{{ Der Weg zur Theologie-Professur ist hart – gerade für Religionslehrer!}}}, year = {{2020}}, } @phdthesis{35956, author = {{Schwabl, Franziska}}, publisher = {{Eusl-Verlagsgesellschaft mbH}}, title = {{{Inszenierungen im digitalen Bild. Eine Rekonstruktion der Selfie-Praktiken Jugendlicher mittels der Dokumentarischen Bildinterpretation.}}}, year = {{2020}}, } @article{35968, author = {{Schwabl, Franziska}}, journal = {{bwp@Berufs-und Wirtschaftspädagogik – online}}, pages = {{1--24}}, title = {{{Fotografien als Zugang zur Lebenswelt Jugendlicher. Eine Analyse der digitalen Inszenierungspraktiken Jugendlicher im berufsschulischen Übergangssystem.}}}, volume = {{38}}, year = {{2020}}, } @inproceedings{35786, author = {{Scheer, D. and Laubenstein, Désirée}}, location = {{Universität zu Köln}}, title = {{{Optimierung von Organisationsstrukturen für die emotionale und soziale Entwicklung? Wissenschaftliche Begleitung des Projekts „Geschwisterklassen“ - online.}}}, year = {{2020}}, } @inproceedings{35791, author = {{Scheer, D. and Laubenstein, Désirée}}, location = {{Potsdam}}, title = {{{Auswirkungen der Corona-Schulschließungen auf Schülerinnen und Schüler mit und ohne Förderbedarf der emotionalen und sozialen Entwicklung (COFESE) - online.}}}, year = {{2020}}, } @article{17862, author = {{Schlangenotto, Darius and Schnedler, Wendelin and Vadovic, Radovan}}, journal = {{Games}}, number = {{3}}, pages = {{1----24}}, title = {{{Against All Odds: Tentative Steps Toward Efficient Information Sharing in Groups}}}, volume = {{11}}, year = {{2020}}, } @article{18236, author = {{Schnedler, Wendelin and Stephan, Nina Lucia}}, issn = {{1439-2917}}, journal = {{Schmalenbach Business Review}}, pages = {{347--364}}, title = {{{Revisiting a Remedy Against Chains of Unkindness}}}, doi = {{10.1007/s41464-020-00090-2}}, year = {{2020}}, } @book{36161, author = {{Krimphove, Dieter}}, pages = {{150}}, title = {{{Werberecht (Gesetze, Urteile, Fälle und Lösungen, Sprachfassung auf interaktiver CD) 2. Auflage}}}, year = {{2020}}, } @article{36185, author = {{Krimphove, Dieter and Lüke, Christoph}}, journal = {{Corporate Finance}}, number = {{Januar/Februar}}, pages = {{9}}, title = {{{Reverse Factoring: Eine alternative Finanzierungsform in der Praxis}}}, year = {{2020}}, } @article{36187, author = {{Krimphove, Dieter}}, journal = {{Compliance Berater}}, number = {{5}}, pages = {{133}}, title = {{{Nachhaltigkeit und Compliance}}}, year = {{2020}}, } @article{36190, author = {{Krimphove, Dieter}}, journal = {{ArbR - Arbeitsrecht Aktuell}}, number = {{20}}, pages = {{511 ff.}}, title = {{{EuGH entscheidet zu Lücken im Europäischen Vorrangsprinzip}}}, year = {{2020}}, } @inproceedings{31361, abstract = {{At Paderborn University, a new 6th semester geometry-course for upper secondary student teachers has been designed and taught by the first author of this paper. To show links between academic mathematics and school mathematics we established so-called interface weeks. These are weeks during a course in which lecture, exercises and homework focus on topics that are related to the normal canon of content but specially chosen for their relevance in school contexts. In this article, we want to present our design for an interface week on the topic of congruence. In order to do so, we first illustrate how so-called interface aspects are used to systematize the mathematical background of the topic, thus giving future mathematics teachers the chance to act professionally. We then show examples of learning activities and first results of the accompanying research.}}, author = {{Hoffmann, Max and Biehler, Rolf}}, booktitle = {{ INDRUM 2020, Université de Carthage, Université de Montpellier, Sep 2020, Cyberspace (virtually from Bizerte), Tunisia}}, title = {{{Designing a Geometry Capstone Course for Student Teachers: Bridging the gap between academic mathematics and school mathematics in the case of congruence}}}, year = {{2020}}, }