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 -