@article{35988, author = {{Schlegel-Matthies, Kirsten}}, issn = {{2193-8806}}, journal = {{Haushalt in Bidlung und Forschung}}, number = {{1}}, pages = {{3--24}}, publisher = {{Barbara Budrich}}, title = {{{Die Bedeutung von Ressourcen für Lebensqualität und gesellschaftliche Teilhabe}}}, doi = {{10.3224/hibifo.v11i1.01}}, volume = {{11}}, year = {{2022}}, } @article{35986, author = {{Schlegel-Matthies, Kirsten}}, issn = {{2193-8806}}, journal = {{Haushalt in Bidlung und Forschung}}, number = {{2}}, pages = {{15--28}}, publisher = {{Barbara Budrich}}, title = {{{Lebensführung und Umgang mit Diversität– Haushaltswissenschaftliche Perspektiven}}}, doi = {{10.3224/hibifo.v11i2.02}}, volume = {{11}}, year = {{2022}}, } @inbook{35969, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{114--136}}, publisher = {{Barbara Budrich}}, title = {{{Die Organisation der Daseinsvorsorge für die private Lebensführung reflektieren}}}, year = {{2022}}, } @inbook{35970, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{90--108}}, publisher = {{Barbara Budrich}}, title = {{{Lehren gestalten – Lernen ermöglichen. Fachdidaktische Hinweise}}}, year = {{2022}}, } @inbook{35979, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{180--207}}, publisher = {{Barbara Budrich}}, title = {{{Lebensweise, Lebensführung und Lebensstile reflektieren}}}, year = {{2022}}, } @inbook{35973, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{62--89}}, publisher = {{Barbara Budrich}}, title = {{{Ernährungs- und Verbraucherbildung zwischen Wissenschaft und Lebenswelt}}}, year = {{2022}}, } @inbook{35955, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{208--230}}, publisher = {{Barbara Budrich}}, title = {{{Die Bedeutung von Konsumentscheidungen für die Lebensführung analysieren und reflektieren}}}, year = {{2022}}, } @inbook{35946, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{157--179}}, publisher = {{Barbara Budrich}}, title = {{{Die Bedeutung und Funktion des Rechts für die Lebensführung verstehen}}}, year = {{2022}}, } @inbook{35975, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Konsum - Ernährung - Gesundheit. Grundlagen der Ernährungs- und Verbraucherbildung}}, isbn = {{978-3-8252-5767-5}}, pages = {{21--61}}, publisher = {{Barbara Budrich}}, title = {{{Ernährungs- und Verbraucherbildung}}}, year = {{2022}}, } @inproceedings{34727, author = {{Schöppner, Volker and Köllermeier, Jonas and Hiesgen, G. and Trippe, J.}}, location = {{Aachen}}, title = {{{Development of Simulation Based Assistant Systems for Automatic Process Monitoring and Derivation of Recommendations to Optimize a Profile Extrusion Line}}}, year = {{2022}}, } @article{32413, abstract = {{Background. Clinching is a conventional cold forming process in which two or more sheets can be joined without auxiliary parts. A pre-forming of the parts to be joined, which is introduced by previous manufacturing steps, has an influence on the joining result. When considering the suitability for joining with regard to the formability of the materials, the influence of the preforming steps must be taken into account. The influences of strain hardening and sheet thickness on the joining properties must be investigated. In this context, a Finite Element Method (FEM) based metamodel analysis of the clinching process was carried out in [1] to investigate the robustness of the clinching process with respect to the different material pre-strains. In [2], the method was extended to the load bearing simulation.Procedure. The metamodel from preliminary work based on various FE models, which predicts the load-bearing capacity of a clinched joint influenced by pre-straining, is compared here with experimental data and the accuracy of the metamodel prediction is discussed. For this purpose an experimental procedure was further develop which allows the preforming of metal sheets from which joining specimens can be separated with a certain degree of unidirectional deformation. In the study, the procedure for preparing the joint specimens and the results of the loading tests are presented. Different possible relevant pre-strain combinations are investigated and compared with the simulation results, to validate the FE models and choose suitable metamodel.}}, author = {{Bielak, Christian Roman and Böhnke, Max and Bobbert, Mathias and Meschut, Gerson}}, issn = {{1662-9795}}, journal = {{Key Engineering Materials}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, pages = {{1516--1526}}, publisher = {{Trans Tech Publications, Ltd.}}, title = {{{Experimental and Numerical Investigation on Manufacturing-Induced Pre-Strain on the Load-Bearing Capacity of Clinched Joints}}}, doi = {{10.4028/p-5d009y}}, volume = {{926}}, year = {{2022}}, } @article{47984, abstract = {{Recent analyses by polarization resolved second-harmonic (SH) microscopy have demonstrated that ferroelectric (FE) domain walls (DWs) can possess non-Ising wall characteristics and topological nature. These analyses rely on locally analyzing the properties, directionality, and magnitude of the second-order nonlinear tensor. However, when inspecting FE DWs with SH microscopy, a manifold of different effects may contribute to the observed signal difference between domains and DWs, i.e., far-field interference, Čerenkov-type phase-matching (CSHG), and changes in the aforementioned local nonlinear optical properties. They all might be present at the same time and, therefore, require careful interpretation and separation. In this work, we demonstrate how the particularly strong Čerenkov-type contrast can selectively be blocked using dark- and bright-field SH microscopy. Based on this approach, we show that other contrast mechanisms emerge that were previously overlayed by CSHG but can now be readily selected through the appropriate experimental geometry. Using the methods presented, we show that the strength of the CSHG contrast compared to the other mechanisms is approximately 22 times higher. This work lays the foundation for the in-depth analysis of FE DW topologies by SH microscopy.}}, author = {{Hegarty, Peter A. and Beccard, Henrik and Eng, Lukas M. and Rüsing, Michael}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{24}}, publisher = {{AIP Publishing}}, title = {{{Turn all the lights off: Bright- and dark-field second-harmonic microscopy to select contrast mechanisms for ferroelectric domain walls}}}, doi = {{10.1063/5.0094988}}, volume = {{131}}, year = {{2022}}, } @inproceedings{34176, abstract = {{Cascaded H-bridge Converters (CHBs) are a promising solution in converting power from a three-phase medium voltage of 6.6 kV...30 kV to a lower DC-voltage in the range of 100 V...1 kV to provide pure DC power to applications such as electrolyzers for hydrogen generation, data centers with a DC power distribution and DC microgrids. CHBs can be interpreted as modular multilevel converters with an isolated DC-DC output stage per module, require a large DC-link capacitor for each module to handle the second harmonic voltage ripple caused by the fluctuating input power within a fundamental grid period. Without a zero-sequence voltage injection, star-connected CHBs are operated with approximately sinusoidal arm voltages and currents. The floating star point potential enables to utilize different zero-sequence voltage injection techniques such as a third-harmonic injection with 1/6 of the grid voltage amplitude or a Min-Max voltage injection. Both well-known methods have the advantage to reduce the peak arm voltage and thereby the number of required modules by 13.4 % (to √ 3 2). This paper proves analytically that the third-harmonic injection with 1/6 of the grid voltage amplitude reduces the second harmonic voltage ripple by only 15.1 % compared to no-voltage injection for unity power factor operation and balanced grid voltages. Then it is shown, that the Min-Max injection has the often overlooked advantage of reducing the second harmonic voltage ripple by even 18.8 %. By applying the here proposed zero-sequence voltage injection in saturation modulation, the second harmonic voltage ripple of the DC-link capacitors is reduced by even 24.3 %, while still requiring the same number of modules as the Min-Max injection. For a realistic number of reserve modules, the overall energy ripple in the DC-link capacitors is reduced by 40 %.}}, author = {{Unruh, Roland and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe)}}, isbn = {{978-9-0758-1539-9}}, keywords = {{Cascaded H-Bridge, Solid-State Transformer, Zero sequence voltage, Third harmonic injection, Capacitor voltage ripple}}, location = {{Hanover, Germany}}, publisher = {{IEEE}}, title = {{{Zero-Sequence Voltage Reduces DC-Link Capacitor Demand in Cascaded H-Bridge Converters for Large-Scale Electrolyzers by 40%}}}, year = {{2022}}, } @inproceedings{33471, abstract = {{The intelligibility of demodulated audio signals from analog high frequency transmissions, e.g., using single-sideband (SSB) modulation, can be severely degraded by channel distortions and/or a mismatch between modulation and demodulation carrier frequency. In this work a neural network (NN)-based approach for carrier frequency offset (CFO) estimation from demodulated SSB signals is proposed, whereby a task specific architecture is presented. Additionally, a simulation framework for SSB signals is introduced and utilized for training the NNs. The CFO estimator is combined with a speech enhancement network to investigate its influence on the enhancement performance. The NN-based system is compared to a recently proposed pitch tracking based approach on publicly available data from real high frequency transmissions. Experiments show that the NN exhibits good CFO estimation properties and results in significant improvements in speech intelligibility, especially when combined with a noise reduction network.}}, author = {{Heitkämper, Jens and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}}, booktitle = {{Proceedings of the 30th European Signal Processing Conference (EUSIPCO)}}, location = {{Belgrad}}, title = {{{Neural Network Based Carrier Frequency Offset Estimation From Speech Transmitted Over High Frequency Channels}}}, year = {{2022}}, } @inproceedings{33847, abstract = {{The scope of speech enhancement has changed from a monolithic view of single, independent tasks, to a joint processing of complex conversational speech recordings. Training and evaluation of these single tasks requires synthetic data with access to intermediate signals that is as close as possible to the evaluation scenario. As such data often is not available, many works instead use specialized databases for the training of each system component, e.g WSJ0-mix for source separation. We present a Multi-purpose Multi-Speaker Mixture Signal Generator (MMS-MSG) for generating a variety of speech mixture signals based on any speech corpus, ranging from classical anechoic mixtures (e.g., WSJ0-mix) over reverberant mixtures (e.g., SMS-WSJ) to meeting-style data. Its highly modular and flexible structure allows for the simulation of diverse environments and dynamic mixing, while simultaneously enabling an easy extension and modification to generate new scenarios and mixture types. These meetings can be used for prototyping, evaluation, or training purposes. We provide example evaluation data and baseline results for meetings based on the WSJ corpus. Further, we demonstrate the usefulness for realistic scenarios by using MMS-MSG to provide training data for the LibriCSS database.}}, author = {{Cord-Landwehr, Tobias and von Neumann, Thilo and Boeddeker, Christoph and Haeb-Umbach, Reinhold}}, booktitle = {{2022 International Workshop on Acoustic Signal Enhancement (IWAENC)}}, location = {{Bamberg}}, title = {{{MMS-MSG: A Multi-purpose Multi-Speaker Mixture Signal Generator}}}, year = {{2022}}, } @inproceedings{35126, author = {{Förster, Nikolas and Hölscher, Jonas and Piepenbrock, Till and Rehlaender, Philipp and Wallscheid, Oliver and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{2022 24th European Conference on Power Electronics and Applications (EPE’22 ECCE Europe)}}, pages = {{P.1--P.9}}, title = {{{An Open-Source FEM Magnetic Toolbox for Calculating Electric and Thermal Behavior of Power Electronic Magnetic Components}}}, year = {{2022}}, } @article{30863, abstract = {{Abstract In this paper a measurement procedure to identify viscoelastic material parameters of plate-like samples using broadband ultrasonic waves is presented. Ultrasonic Lamb waves are excited via the thermoelastic effect using laser radiation and detected by a piezoelectric transducer. The resulting measurement data is transformed to yield information about multiple propagating Lamb waves as well as their attenuation. These results are compared to simulation results in an inverse procedure to identify the parameters of an elastic and a viscoelastic material model.}}, author = {{Johannesmann, Sarah and Claes, Leander and Feldmann, Nadine and Zeipert, Henning and Henning, Bernd}}, issn = {{2196-7113}}, journal = {{tm - Technisches Messen}}, keywords = {{Electrical and Electronic Engineering, Instrumentation}}, number = {{7 - 8}}, pages = {{493 -- 506}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Lamb wave based approach to the determination of acoustic material parameters}}}, doi = {{10.1515/teme-2021-0134}}, volume = {{89}}, year = {{2022}}, } @article{33952, abstract = {{Aufgrund der heterogenen Schülerschaft im Berufsfeld Ernährung und Hauswirtschaft müssen Studierende für sprachbildenden Fachunterricht professionalisiert werden. Aufbauend auf einer theoretischen Fundierung werden konkrete Umsetzungsbeispiele anhand von drei exemplarischen Online-Modulen für den Ausbildungsberuf Hotelfachfrau/-mann vorgestellt.}}, author = {{Dehn, Freya and Meyer, Anja and Niederhaus, Constanze and Schlegel-Matthies, Kirsten}}, issn = {{2193-8806}}, journal = {{HiBiFo – Haushalt in Bildung & Forschung}}, number = {{3}}, pages = {{3--17}}, publisher = {{Verlag Barbara Budrich GmbH}}, title = {{{Professionalisierung von Lehramtsstudierenden für sprachbildenden Fachunterricht im Berufsfeld Ernährung und Hauswirtschaft}}}, doi = {{10.3224/hibifo.v11i3.01}}, volume = {{11}}, year = {{2022}}, } @article{34733, abstract = {{Due to their valuable properties (low weight, and good thermal and mechanical properties), glass fiber reinforced thermoplastics are becoming increasingly important. Fiber-reinforced thermoplastics are mainly manufactured by injection molding and extrusion, whereby the extrusion compounding process is primarily used to produce fiber-filled granulates. Reproducible production of high-quality components requires a granulate in which the fiber length is even and high. However, the extrusion process leads to the fact that fiber breakages can occur during processing. To enable a significant quality enhancement, experimentally validated modeling is required. In this study, short glass fiber reinforced thermoplastics (polypropylene) were produced on two different twin-screw extruders. Therefore, the machine-specific process behavior is of major interest regarding its influence. First, the fiber length change after processing was determined by experimental investigations and then simulated with the SIGMA simulation software. By comparing the simulation and experimental tests, important insights could be gained and the effects on fiber lengths could be determined in advance. The resulting fiber lengths and distributions were different, not only for different screw configurations (SC), but also for the same screw configurations on different twin-screw extruders. This may have been due to manufacturer-specific tolerances.}}, author = {{Rüppel, Annette and Wolff, Susanne and Oldemeier, Jan Philipp and Schöppner, Volker and Heim, Hans-Peter}}, issn = {{2073-4360}}, journal = {{Polymers}}, keywords = {{Polymers and Plastics, General Chemistry}}, number = {{15}}, publisher = {{MDPI AG}}, title = {{{Influence of Processing Glass-Fiber Filled Plastics on Different Twin-Screw Extruders and Varying Screw Designs on Fiber Length and Particle Distribution}}}, doi = {{10.3390/polym14153113}}, volume = {{14}}, year = {{2022}}, } @techreport{47094, author = {{Bartels, Lara and Kesternich, Martin}}, issn = {{1556-5068}}, keywords = {{General Earth and Planetary Sciences, General Environmental Science}}, publisher = {{ZEW Discussion Paper 22-040}}, title = {{{Motivate the Crowd or Crowd-Them Out? The Impact of Local Government Spending on the Voluntary Provision of a Green Public Good}}}, doi = {{10.2139/ssrn.4251592}}, year = {{2022}}, }