@inproceedings{40541, author = {{Itner, D. and Gravenkamp, H. and Dreiling, Dmitrij and Feldmann, Nadine and Henning, Bernd}}, booktitle = {{14th WCCM-ECCOMAS Congress}}, publisher = {{CIMNE}}, title = {{{Simulation of Guided Waves in Cylinders Subject to Arbitrary Boundary Conditions Using the Scaled Boundary Finite Element Method}}}, doi = {{10.23967/wccm-eccomas.2020.307}}, volume = {{700}}, year = {{2021}}, } @article{41427, author = {{Uppenkamp, Vera and Höger, Christian}}, journal = {{Theo-Web. Zeitschrift für Religionspädagogik}}, number = {{2}}, pages = {{146--153}}, title = {{{"Wenn sich die Mitte auflöst...", ist das kein Verlust für die Religionspädagogik - ein bilanzierender Tagungsrückblick mit Augenzwinkern}}}, volume = {{20}}, year = {{2021}}, } @misc{41425, author = {{Uppenkamp, Vera}}, booktitle = {{Das wissenschaftlich-religionspädagogische Lexikon im Internet www.wirelex.de}}, title = {{{Art. Mädchen/Frauen}}}, year = {{2021}}, } @phdthesis{42070, author = {{Olma, Simon}}, isbn = {{9783947647231}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts}}, title = {{{Systemtheorie von Hardware-in-the-Loop-Simulationen mit Anwendung auf einem Fahrzeugachsprüfstand mit parallelkinematischem Lastsimulator}}}, volume = {{404}}, year = {{2021}}, } @phdthesis{42069, author = {{Lankeit, Christopher}}, title = {{{Systematik zur Evolution technischer Anforderungen}}}, year = {{2021}}, } @book{42250, author = {{Eckel, Julia}}, isbn = {{ 978-3-8394-5320-9}}, pages = {{380}}, publisher = {{transcript}}, title = {{{ Das Audioviduum. Eine Theoriegeschichte des Menschenmotivs in audiovisuellen Medien}}}, year = {{2021}}, } @inbook{38153, author = {{Fuchs, Christian}}, booktitle = {{The Public Service Media and Public Service Internet Manifesto}}, editor = {{Fuchs, Christian and Unterberger, Klaus}}, pages = {{19--68}}, publisher = {{University of Westminster Press}}, title = {{{The Public Service Media and Public Service Internet Utopias Survey Report}}}, doi = {{https://doi.org/10.16997/book60.c}}, year = {{2021}}, } @article{38143, author = {{Fuchs, Christian}}, journal = {{Information, Communication and Society}}, number = {{15}}, pages = {{2258--2276}}, title = {{{History and Class Consciousness 2.0: Georg Lukács in the Age of Digital Capitalism and Big Data}}}, doi = {{https://doi.org/10.1080/1369118X.2020.1759670 }}, volume = {{24}}, year = {{2021}}, } @article{38146, author = {{Fuchs, Christian}}, journal = {{tripleC: Communication, Capitalism & Critique}}, number = {{1}}, pages = {{15--51}}, title = {{{Engels@200: Friedrich Engels and Digital Capitalism. How Relevant Are Engels’s Works 200 Years After His Birth?}}}, doi = {{https://doi.org/10.31269/triplec.v19i1.1228 }}, volume = {{19}}, year = {{2021}}, } @article{38145, author = {{Fuchs, Christian}}, journal = {{tripleC: Communication, Capitalism & Critique}}, number = {{1}}, pages = {{1--14}}, title = {{{Engels@200: Friedrich Engels in the Age of Digital Capitalism. Introduction}}}, doi = {{https://doi.org/10.31269/triplec.v19i1.1229}}, volume = {{19}}, year = {{2021}}, } @article{38147, author = {{Fuchs, Christian}}, journal = {{Critical Sociology}}, number = {{7-8}}, pages = {{1219--1243}}, title = {{{Cornel West and Marxist Humanism}}}, doi = {{https://doi.org/10.1177/0896920520988314 }}, volume = {{47}}, year = {{2021}}, } @book{38133, editor = {{Fuchs, Christian and Unterberger, Klaus}}, publisher = {{University of Westminster Press}}, title = {{{The Public Service Media and Public Service Internet Manifesto}}}, doi = {{https://doi.org/10.16997/book60}}, year = {{2021}}, } @inbook{38152, author = {{Alessandro, D'Arma and Fuchs, Christian and Horowitz, Minna and Unterberger, Klaus}}, booktitle = {{The Public Service Media and Public Service Internet Manifesto}}, editor = {{Fuchs, Christian and Unterberger, Klaus}}, pages = {{113--127}}, publisher = {{University of Westminster Press}}, title = {{{The Future of Public Service Media and the Internet}}}, doi = {{https://doi.org/10.16997/book60.e}}, year = {{2021}}, } @inbook{38154, author = {{Fuchs, Christian and Unterberger, Klaus}}, booktitle = {{The Public Service Media and Public Service Internet Manifesto}}, editor = {{Fuchs, Christian and Unterberger, Klaus}}, pages = {{1--6}}, publisher = {{University of Westminster Press}}, title = {{{Introduction}}}, doi = {{https://doi.org/10.16997/book60.a}}, year = {{2021}}, } @article{38148, author = {{Fuchs, Christian}}, journal = {{Westminster Papers in Communication and Culture}}, number = {{1}}, pages = {{9--26}}, title = {{{The Digital Commons and the Digital Public Sphere: How to Advance Digital Democracy Today}}}, doi = {{https://doi.org/10.16997/wpcc.917}}, volume = {{16}}, year = {{2021}}, } @article{38157, author = {{Fuchs, Christian}}, journal = {{tripleC: Communication, Capitalism & Critique}}, number = {{1}}, pages = {{246--251}}, title = {{{How Did Donald Trump Incite a Coup Attempt?}}}, doi = {{https://doi.org/10.31269/triplec.v19i1.1239}}, volume = {{19}}, year = {{2021}}, } @article{38149, author = {{Fuchs, Christian}}, journal = {{Journal of Media Ethics}}, number = {{4}}, pages = {{186--201}}, title = {{{Foundations of Communication/Media/Digital (In)Justice}}}, doi = {{http://doi.org/10.1080/23736992.2021.1964968}}, volume = {{36}}, year = {{2021}}, } @misc{38156, author = {{Fuchs, Christian}}, booktitle = {{The Conversation}}, title = {{{Channel 4: Rather Than Privatising Public Service Media We Should Be Expanding It Online}}}, year = {{2021}}, } @article{42483, author = {{Fuchs, Christian}}, journal = {{tripleC: Communication, Capitalism & Critique}}, number = {{2}}, pages = {{371--373}}, title = {{{Preface: Manfred Knoche’s Critique of the Political Economy of the Media and Communication [Preface to the article “Media Concentration” by Manfred Knoche]}}}, doi = {{https://doi.org/10.31269/triplec.v19i2.1298}}, volume = {{19}}, year = {{2021}}, } @article{21946, abstract = {{Lithium niobate (LiNbO3), a material frequently used in optical applications, hosts different kinds of polarons that significantly affect many of its physical properties. In this study, a variety of electron polarons, namely free, bound, and bipolarons, are analyzed using first-principles calculations. We perform a full structural optimization based on density-functional theory for selected intrinsic defects with special attention to the role of symmetry-breaking distortions that lower the total energy. The cations hosting the various polarons relax to a different degree, with a larger relaxation corresponding to a larger gap between the defect level and the conduction-band edge. The projected density of states reveals that the polaron states are formerly empty Nb 4d states lowered into the band gap. Optical absorption spectra are derived within the independent-particle approximation, corrected by the GW approximation that yields a wider band gap and by including excitonic effects within the Bethe-Salpeter equation. Comparing the calculated spectra with the density of states, we find that the defect peak observed in the optical absorption stems from transitions between the defect level and a continuum of empty Nb 4d states. Signatures of polarons are further analyzed in the reflectivity and other experimentally measurable optical coefficients.}}, author = {{Schmidt, Falko and Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero and Schindlmayr, Arno}}, issn = {{2073-4352}}, journal = {{Crystals}}, pages = {{542}}, publisher = {{MDPI}}, title = {{{Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response}}}, doi = {{10.3390/cryst11050542}}, volume = {{11}}, year = {{2021}}, } @article{25893, abstract = {{Tailor-made ordered mesoporous materials bear great potential in numerous fields of application where large interfaces are required. However, the inherent surfacechemical properties of conventional materials, such as silica, carbon or organosilica, poses some limitations with respect to their application. Surface manipulation by functionalization with chemically more reactive groups is one way to improve materials for their desired purpose. Another approach is the design of high surface-area composite materials. The surface manipulation, either by functionalization or by introducing guest species, can be performed selectively. This means that when several distinct, i.e. , hierarchical, types of surfaces or pore systems exist in a material, each of them may be chosen for manipulation. Several strategies can be identified to achieve this goal. Molecules or molecule assemblies can be utilized to temporarily protect pores or surfaces (soft protection), while manipulation occurs at the accessible sites. This approach is a recurring motive in this review and can also be applied to rigid template matrices (hard protection). Furthermore, the size of functionalization agents (size protection) and their reactivity/diffusion (kinetic protection) into the pores can also be utilized to achieve selectivity. In addition, challenges in the synthesis and characterization of selectively manipulated ordered mesoporous materials are discussed.}}, author = {{Tiemann, Michael and Weinberger, Christian}}, issn = {{2196-7350}}, journal = {{Advanced Materials Interfaces}}, title = {{{Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials}}}, doi = {{10.1002/admi.202001153}}, year = {{2021}}, } @article{41431, author = {{Fuchs, Christian}}, journal = {{tripleC: Communication, Capitalism & Critique}}, number = {{1}}, pages = {{1--194}}, title = {{{Engels@200: Friedrich Engels in the Age of Digital Capitalism}}}, doi = {{https://doi.org/10.31269/triplec.v19i1.1233}}, volume = {{19}}, year = {{2021}}, } @article{43016, author = {{Möhring, Julia and Krumhöfner, Anika and Gräfin von Plettenberg, Elisabeth Gudila Sophia Ida Maria}}, journal = {{-}}, publisher = {{Reinhard Mohn Stiftung, Kreissportbund Gütersloh e.V., Bezirksregierung Detmold}}, title = {{{Bewegungsförderung in Ganztagsschulen}}}, year = {{2021}}, } @techreport{33210, author = {{Leineweber, Jonas}}, title = {{{Veranstaltungsbericht: Immaterielles Kulturerbe in Nordrhein-Westfalen – Steigerlied und Trinkhallenkultur im Ruhrgebiet erhalten Auszeichnung anlässlich der Neuaufnahmen in das nordrhein-westfälische Landesinventar}}}, year = {{2021}}, } @techreport{33209, author = {{Leineweber, Jonas}}, title = {{{Tagungsbericht: Immaterielles Kulturerbe und regionale Identität. Gesellschaftliche Repräsentation und Partizipation im Schützenwesen}}}, year = {{2021}}, } @article{22960, abstract = {{We perform a theoretical analysis of the structural and electronic properties of sodium potassium niobate K1-xNaxNbO3 in the orthorhombic room-temperature phase, based on density-functional theory in combination with the supercell approach. Our results for x=0 and x=0.5 are in very good agreement with experimental measurements and establish that the lattice parameters decrease linearly with increasing Na contents, disproving earlier theoretical studies based on the virtual-crystal approximation that claimed a highly nonlinear behavior with a significant structural distortion and volume reduction in K0.5Na0.5NbO3 compared to both end members of the solid solution. Furthermore, we find that the electronic band gap varies very little between x=0 and x=0.5, reflecting the small changes in the lattice parameters.}}, author = {{Bidaraguppe Ramesh, Nithin and Schmidt, Falko and Schindlmayr, Arno}}, issn = {{1434-6036}}, journal = {{The European Physical Journal B}}, number = {{8}}, publisher = {{EDP Sciences, Società Italiana di Fisica and Springer}}, title = {{{Lattice parameters and electronic band gap of orthorhombic potassium sodium niobate K0.5Na0.5NbO3 from density-functional theory}}}, doi = {{10.1140/epjb/s10051-021-00179-8}}, volume = {{94}}, year = {{2021}}, } @article{22761, author = {{Friedrich, Christoph and Blügel, Stefan and Schindlmayr, Arno}}, issn = {{2469-9969}}, journal = {{Physical Review B}}, number = {{3}}, publisher = {{American Physical Society}}, title = {{{Erratum: Efficient implementation of the GW approximation within the all-electron FLAPW method [Phys. Rev. B 81, 125102 (2010)]}}}, doi = {{10.1103/PhysRevB.104.039901}}, volume = {{104}}, year = {{2021}}, } @article{23816, abstract = {{Employing the ultrafast control of electronic states of a semiconductor quantum dot in a cavity, we introduce an approach to achieve on-demand emission of single photons with almost perfect indistinguishability and photon pairs with near ideal entanglement. Our scheme is based on optical excitation off resonant to a cavity mode followed by ultrafast control of the electronic states using the time-dependent quantum-confined Stark effect, which then allows for cavity-resonant emission. Our theoretical analysis considers cavity-loss mechanisms, the Stark effect, and phonon-induced dephasing, allowing realistic predictions for finite temperatures.}}, author = {{Bauch, David and Heinze, Dirk Florian and Förstner, Jens and Jöns, Klaus and Schumacher, Stefan}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, keywords = {{tet_topic_qd}}, pages = {{085308}}, title = {{{Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots}}}, doi = {{10.1103/physrevb.104.085308}}, volume = {{104}}, year = {{2021}}, } @article{23418, abstract = {{Density-functional theory within a Berry-phase formulation of the dynamical polarization is used to determine the second-order susceptibility χ(2) of lithium niobate (LiNbO3). Defect trapped polarons and bipolarons are found to strongly enhance the nonlinear susceptibility of the material, in particular if localized at NbV–VLi defect pairs. This is essentially a consequence of the polaronic excitation resulting in relaxation-induced gap states. The occupation of these levels leads to strongly enhanced χ(2) coefficients and allows for the spatial and transient modification of the second-harmonic generation of macroscopic samples.}}, author = {{Kozub, Agnieszka L. and Schindlmayr, Arno and Gerstmann, Uwe and Schmidt, Wolf Gero}}, issn = {{2469-9969}}, journal = {{Physical Review B}}, pages = {{174110}}, publisher = {{American Physical Society}}, title = {{{Polaronic enhancement of second-harmonic generation in lithium niobate}}}, doi = {{10.1103/PhysRevB.104.174110}}, volume = {{104}}, year = {{2021}}, } @article{24548, author = {{Martin, Sven and Tröster, Thomas}}, journal = {{ESAFORM 2021}}, title = {{{Joint point loadings in car bodies – the influence of manufacturing tolerances and scatter in material properties}}}, doi = {{10.25518/esaform21.3801}}, year = {{2021}}, } @inproceedings{23465, abstract = {{One of the main objectives of production engineering is to reproducibly manufacture (complex) defect-free parts. To achieve this, it is necessary to employ an appropriate process or tool design. While this will generally prove successful, it cannot, however, offset stochastic defects with local variations in material properties. Closed-loop process control represents a promising approach for a solution in this context. The state of the art involves using this approach to control geometric parameters such as a length. So far, no research or applications have been conducted with closed-loop control for microstructure and product properties. In the project on which this paper is based, the local martensite content of parts is to be adjusted in a highly precise and reproducible manner. The forming process employed is a special, property-controlled flow-forming process. A model-based controller is thus to generate corresponding correction values for the tool-path geometry and tool-path velocity on the basis of online martensite content measurements. For the controller model, it is planned to use a special process or microstructure (correlation) model. The planned paper not only describes the experimental setup but also presents results of initial experimental investigations for subsequent use in the closed-loop control of α’-martensite content during flow-forming.}}, author = {{Arian, Bahman and Homberg, Werner and Riepold, Markus and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}}, isbn = {{978-2-87019-302-0}}, keywords = {{Flow-forming, Spinning, Process Strategy, Martensite Content, Property Control, Micromagnetic Measurement, Metastable Austenitic Stainless Steel}}, location = {{Liège, Belgium}}, publisher = {{ULiège Library}}, title = {{{Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming}}}, year = {{2021}}, } @article{34484, abstract = {{Multiprofessionelle Teams sind notwendiger Bestandteil inklusiver Schulen. Die Verteilung von Aufgaben, welche über die Zusammenarbeit von allgemeinen und sonderpädagogi­schen Lehrkräften im Unterricht hinausgehen, wurde bislang jedoch selten systematisch untersucht. Im Beitrag werden deskriptive Befunde aus dem Projekt BiFoKi (Bielefelder Fortbildungskonzept zur Kooperation in inklusiven Schulen) zu den Zuständigkeiten von allgemeinen (N = 170) und sonderpädagogischen Lehrkräften (N = 24) sowie Schulsozial­arbeiterinnen (N = 11) an inklusiven Sekundar-­ und Gesamtschulen präsentiert. Sie deuten auf eine Persistenz traditioneller Rollenmuster und Aufgabenverteilungen hin. Bei den befragten sonderpädagogischen Lehrkräften können zwei unterschiedliche Rollenmuster herausgearbeitet werden. Die Schulsozialarbeiterinnen weisen ein enges Arbeitsfeld mit einem Fokus auf Eltern­-Schule-­Kooperation auf. }}, author = {{Neumann, Phillip and Grüter, Sandra and Eckel, Lisa and Lütje-Klose, Birgit and Wild, Elke and Gorges, Julia}}, issn = {{0513-9066}}, journal = {{Zeitschrift für Heilpädagogik}}, keywords = {{Inklusion, Sonderpädagogik, Sekundarstufe, Gesamtschulen, Kooperation, Schulsozialarbeit, BiFoKi}}, number = {{4}}, pages = {{164--177}}, title = {{{Aufgaben und Zuständigkeiten von allgemeinen und sonderpädagogischen Lehrkräften sowie Fachkräften der ­Schulsozialarbeit­ in­ inklusiven­ Schulen­ der­ Sekundarstufe I. Erste Ergebnisse aus dem BiFoKi-Projekt}}}, volume = {{73}}, year = {{2021}}, } @inproceedings{24080, abstract = {{Challenges of the development of mechatronic systems and corresponding production systems have increased steadily. Changes are primarily due to increased product complexity and the connection to the internet of things and services, enabling Cyber-Physical Systems (CPS) and Cyber-Physical Production Systems (CPPS). Major innovations of the revised VDI guideline 2206 for developing mechatronic systems are systems thinking as a core element and six checkpoints for structuring deliverables along the V-Model. These checkpoints serve for orientation in result progress and thus enable a structured and complete development process. However, tasks and checkpoints of the new guideline focus on the product development itself without integrating the development of related CPPS, enabling optimization simultaneously to system development. Implications are derived by a three-step analysis. The paper at hand contributes fundamental extensions of the checkpoint questions regarding integrated CPPS development. These questions provide methodical support for system developers of CPPS for CPS by enabling the project manager to check the status, schedule further development steps and evaluate the maturity of the whole, integrated development.}}, author = {{Gräßler, Iris and Wiechel, Dominik and Roesmann, Daniel and Thiele, Henrik}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, keywords = {{Cyber-Physical Production System (CPPS), V-Model, Product System Development, Integrated Development, VDI 2206}}, pages = {{253--258}}, title = {{{V-model based development of cyber-physical systems and cyber-physical production systems}}}, doi = {{10.1016/j.procir.2021.05.119}}, year = {{2021}}, } @inproceedings{20681, abstract = {{The battle of developing hardware Trojans and corresponding countermeasures has taken adversaries towards ingenious ways of compromising hardware designs by circumventing even advanced testing and verification methods. Besides conventional methods of inserting Trojans into a design by a malicious entity, the design flow for field-programmable gate arrays (FPGAs) can also be surreptitiously compromised to assist the attacker to perform a successful malfunctioning or information leakage attack. The advanced stealthy malicious look-up-table (LUT) attack activates a Trojan only when generating the FPGA bitstream and can thus not be detected by register transfer and gate level testing and verification. However, also this attack was recently revealed by a bitstream-level proof-carrying hardware (PCH) approach. In this paper, we present a novel attack that leverages malicious routing of the inserted Trojan circuit to acquire a dormant state even in the generated and transmitted bitstream. The Trojan's payload is connected to primary inputs/outputs of the FPGA via a programmable interconnect point (PIP). The Trojan is detached from inputs/outputs during place-and-route and re-connected only when the FPGA is being programmed, thus activating the Trojan circuit without any need for a trigger logic. Since the Trojan is injected in a post-synthesis step and remains unconnected in the bitstream, the presented attack can currently neither be prevented by conventional testing and verification methods nor by recent bitstream-level verification techniques.}}, author = {{Ahmed, Qazi Arbab and Wiersema, Tobias and Platzner, Marco}}, booktitle = {{2021 Design, Automation & Test in Europe Conference & Exhibition (DATE)}}, location = {{Alpexpo | Grenoble, France}}, publisher = {{2021 Design, Automation and Test in Europe Conference (DATE)}}, title = {{{Malicious Routing: Circumventing Bitstream-level Verification for FPGAs}}}, doi = {{10.23919/DATE51398.2021.9474026}}, year = {{2021}}, } @article{29815, abstract = {{Aluminium steel clad materials have high potential for industrial applications. Their mechanical properties are governed by an intermetallic layer, which forms upon heat treatment at the Al-Fe interface. Transmission electron microscopy was employed to identify the phases present at the interface by selective area electron diffraction and energy dispersive spectroscopy. Three phases were identified: orthorhombic Al5Fe2, monoclinic Al13Fe4 and cubic Al19Fe4MnSi2. An effective interdiffusion coefficient dependent on concentration was determined according to the Boltzmann–Matano method. The highest value of the interdiffusion coefficient was reached at the composition of the intermetallic phases. Afterwards, the process of diffusion considering the evaluated interdiffusion coefficient was simulated using the finite element method. Results of the simulations revealed that growth of the intermetallic phases proceeds preferentially in the direction of aluminium.}}, author = {{Křivská, Barbora and Šlapáková, Michaela and Veselý, Jozef and Kihoulou, Martin and Fekete, Klaudia and Minárik, Peter and Králík, Rostislav and Grydin, Olexandr and Stolbchenko, Mykhailo and Schaper, Mirko}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{24}}, publisher = {{MDPI AG}}, title = {{{Intermetallic Phases Identification and Diffusion Simulation in Twin-Roll Cast Al-Fe Clad Sheet}}}, doi = {{10.3390/ma14247771}}, volume = {{14}}, year = {{2021}}, } @article{24566, author = {{Engelkemeier, Katja and Sun, Aijia and Voswinkel, Dietrich and Grydin, Olexandr and Schaper, Mirko and Bremser, Wolfgang}}, issn = {{2196-0216}}, journal = {{ChemElectroChem}}, pages = {{2155--2168}}, publisher = {{Wiley}}, title = {{{Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte}}}, doi = {{10.1002/celc.202100216}}, year = {{2021}}, } @article{23803, author = {{Reitz, Alexander and Grydin, Olexandr and Schaper, Mirko}}, journal = {{Materials Data for Smart Forming Technologies}}, location = {{Freiberg}}, title = {{{Characterization of phase transformations during graded thermo- mechanical treatment of steel 22MnB5 by means of optical methods }}}, year = {{2021}}, } @article{21545, author = {{Masendorf, Lukas and Wächter, Michael and Esderts, Alfons and Otroshi, Mortaza and Meschut, Gerson}}, issn = {{8756-758X}}, journal = {{Fatigue & Fracture of Engineering Materials & Structures}}, pages = {{15}}, title = {{{Service life estimation of self‐piercing riveted joints by linear damage accumulation}}}, doi = {{10.1111/ffe.13446}}, year = {{2021}}, } @inproceedings{36527, author = {{Jensen, Solveig and Gasteiger, Hedwig and Bruns, Julia}}, booktitle = {{Proceedings of the 44th Conference of the International Group for the Psychology of Mathematics Education}}, editor = {{Inprasitha, Maitree and Changsri, Narumon and Boonsena, Nisakorn}}, location = {{Khon Kaen, Thailand}}, pages = {{101--109}}, title = {{{Place value and regrouping as seperate constructs of place value understanding}}}, volume = {{3}}, year = {{2021}}, } @inproceedings{36536, author = {{Jensen, Solveig and Gasteiger, Hedwig and Bruns, Julia}}, booktitle = {{Beiträge zum Mathematikunterricht 2021}}, location = {{Lüneburg}}, publisher = {{WTM-Verlag}}, title = {{{Stellenwertverständnis: Verständnis von Stellenwertprinzip und Bündelungsprinzip als separate Konstrukte}}}, doi = {{http://dx.doi.org/10.17877/DE290R-22292}}, year = {{2021}}, } @inproceedings{45326, author = {{Mattei, Annalisa and Eremin, Oxana}}, booktitle = {{Bericht zur Jahrestagung der Sektion Frauen- und Geschlechterforschung in der Erziehungswissenschaft in der Deutschen Gesellschaft für Erziehungswissenschaft}}, location = {{Europa-Universität Flensburg }}, pages = {{87--89}}, title = {{{Corona und Krise. Perspektiven erziehungswissenschaftlicher Frauen- und Geschlechterforschung}}}, year = {{2021}}, } @inbook{45319, author = {{Schemmer, Susanne Jutta and Heisler, Dietmar and Rink, Julia}}, booktitle = {{Entwicklungen und Perspektiven in der Berufsorientierung. Stand und Herausforderungen. Online: (06.12.2021)}}, editor = {{Weyland, Ulrike and Ziegler, Birgit and Driesel-Lange, Katja and Kruse, Annika}}, pages = {{60--78}}, publisher = {{Verlag Barbara Budrich}}, title = {{{Entwicklungschance oder Warteschleife? Berufsorientierung und Berufswahl in der Berufsfachschule}}}, year = {{2021}}, } @inproceedings{46194, author = {{Kenter, Tobias and Shambhu, Adesh and Faghih-Naini, Sara and Aizinger, Vadym}}, booktitle = {{Proceedings of the Platform for Advanced Scientific Computing Conference}}, publisher = {{ACM}}, title = {{{Algorithm-hardware co-design of a discontinuous Galerkin shallow-water model for a dataflow architecture on FPGA}}}, doi = {{10.1145/3468267.3470617}}, year = {{2021}}, } @book{46613, abstract = {{Trotz massiver Förderungen für die Digitalisierung ist die Präsenzlehre noch immer der Standard an deutschen Hochschulen. Aufgrund des Physical Distancing im Zuge der Corona-Pandemie musste sie jedoch kurzfristig fast vollständig digitalisiert werden. Die Beiträge des Bandes bieten einen multiperspektivischen Zugang zu den damit verbundenen Herausforderungen und beleuchten, wie die verschiedenen Akteur*innen die Umstellung auf digitale Lehr- und Lernformate umgesetzt und erlebt haben. Durch die Zusammenführung der verschiedenen Sichtweisen können die Bedarfe und Wünsche der einzelnen Akteursgruppen zusammengebracht und bei der nachhaltigen Weiterentwicklung der Hochschullehre besser berücksichtigt werden.}}, editor = {{Neiske, Iris and Osthushenrich, Judith and Schaper, Niclas and Trier, Ulrike and Vöing, Nerea}}, isbn = {{9783837656909}}, issn = {{2749-7623}}, publisher = {{transcript Verlag}}, title = {{{Hochschule auf Abstand}}}, doi = {{10.14361/9783839456903}}, year = {{2021}}, } @inproceedings{22724, abstract = {{ Predictive Maintenance as a desirable maintenance strategy in industrial applications relies on suitable condition monitoring solutions to reduce costs and risks of the monitored technical systems. In general, those solutions utilize model-based or data-driven methods to diagnose the current state or predict future states of monitored technical systems. However, both methods have their advantages and drawbacks. Combining both methods can improve uncertainty consideration and accuracy. Different combination approaches of those hybrid methods exist to exploit synergy effects. The choice of an appropriate approach depends on different requirements and the goal behind the selection of a hybrid approach. In this work, the hybrid approach for estimating remaining useful lifetime takes potential uncertainties into account. Therefore, a data-driven estimation of new measurements is integrated within a model-based method. To consider uncertainties within the system, a differentiation between different system behavior is realized throughout diverse states of degradation. The developed hybrid prediction approach bases on a particle filtering method combined with a machine learning method, to estimate the remaining useful lifetime of technical systems. Particle filtering as a Monte Carlo simulation technique is suitable to map and propagate uncertainties. Moreover, it is a state-of-the-art model-based method for predicting remaining useful lifetime of technical systems. To integrate uncertainties a multi-model particle filtering approach is employed. In general, resampling as a part of the particle filtering approach has the potential to lead to an accurate prediction. However, in the case where no future measurements are available, it may increase the uncertainty of the prediction. By estimating new measurements, those uncertainties are reduced within the data-driven part of the approach. Hence, both parts of the hybrid approach strive to account for and reduce uncertainties. Rubber-metal-elements are employed as a use-case to evaluate the developed approach. Rubber-metal-elements, which are used to isolate vibrations in various systems, such as railways, trucks and wind turbines, show various uncertainties in their behavior and their degradation. Those uncertainties are caused by diverse inner and outer factors, such as manufacturing influences and operating conditions. By expert knowledge the influences are described, analyzed and if possible reduced. However, the remaining uncertainties are considered within the hybrid prediction method. Relative temperature is the selected measurand to describe the element’s degradation. In lifetime tests, it is measured as the difference between the element’s temperature and the ambient temperature. Thereby, the influence of the ambient temperature on the element’s temperature is taken into account. Those elements show three typical states of degradation that are identified within the temperature measurements. Depending on the particular state of degradation a new measurement is estimated within the hybrid approach to reduce potential uncertainties. Finally, the performance of the developed hybrid method is compared to a model-based method for estimating the remaining useful lifetime of the same elements. Suitable performance indices are implemented to underline the differences between the results.}}, author = {{Bender, Amelie and Sextro, Walter}}, booktitle = {{Proceedings of the European Conference of the PHM Society 2021}}, editor = {{Do, Phuc and King, Steve and Fink, Olga}}, keywords = {{Hybrid prediction method, Multi-model particle filtering, Uncertainty quantification, RUL estimation}}, number = {{1}}, title = {{{Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties}}}, doi = {{https://doi.org/10.36001/phme.2021.v6i1.2843 }}, volume = {{6}}, year = {{2021}}, } @inproceedings{22507, abstract = {{Several methods, including order analysis, wavelet analysis and empirical mode decomposition have been proposed and successfully employed for the health state estimation of technical systems operating under varying conditions. However, where information such as the speed of rotating machinery, component specifications or other domain-specific information is unavailable, such methods are often infeasible. Thus, this paper investigates the application of classical time-domain features, features from the medical field and novel features from the highly comparative time-series analysis (HCTSA) package, for the health state estimation of rotating machinery operating under varying conditions. Furthermore, several feature selection methods are investigated to identify features as viable health indicators for the diagnostics and prognostics of technical systems. As a case study, the presented methods are evaluated on real-world and experimentally acquired vibration data of bearings operating under varying speed. The results show that the selected features can successfully be employed as health indicators for technical systems operating under varying conditions.}}, author = {{Aimiyekagbon, Osarenren Kennedy and Bender, Amelie and Sextro, Walter}}, booktitle = {{Proceedings of the Seventeenth International Conference on Condition Monitoring and Asset Management (CM 2021)}}, keywords = {{Wind turbine diagnostics, bearing diagnostics, non-stationary operating conditions, varying operating conditions, feature extraction, feature selection, fault detection, failure detection}}, title = {{{On the applicability of time series features as health indicators for technical systems operating under varying conditions}}}, year = {{2021}}, } @inproceedings{27111, abstract = {{In the industry 4.0 era, there is a growing need to transform unstructured data acquired by a multitude of sources into information and subsequently into knowledge to improve the quality of manufactured products, to boost production, for predictive maintenance, etc. Data-driven approaches, such as machine learning techniques, are typically employed to model the underlying relationship from data. However, an increase in model accuracy with state-of-the-art methods, such as deep convolutional neural networks, results in less interpretability and transparency. Due to the ease of implementation, interpretation and transparency to both domain experts and non-experts, a rule-based method is proposed in this paper, for prognostics and health management (PHM) and specifically for diagnostics. The proposed method utilizes the most relevant sensor signals acquired via feature extraction and selection techniques and expert knowledge. As a case study, the presented method is evaluated on data from a real-world quality control set-up provided by the European prognostics and health management society (PHME) at the conference’s 2021 data challenge. With the proposed method, our team took the third place, capable of successfully diagnosing different fault modes, irrespective of varying conditions.}}, author = {{Aimiyekagbon, Osarenren Kennedy and Muth, Lars and Wohlleben, Meike Claudia and Bender, Amelie and Sextro, Walter}}, booktitle = {{Proceedings of the European Conference of the PHM Society 2021}}, editor = {{Do, Phuc and King, Steve and Fink, Olga}}, keywords = {{PHME 2021, Feature Selection Classification, Feature Selection Clustering, Interpretable Model, Transparent Model, Industry 4.0, Real-World Diagnostics, Quality Control, Predictive Maintenance}}, number = {{1}}, pages = {{527--536}}, title = {{{Rule-based Diagnostics of a Production Line}}}, doi = {{10.36001/phme.2021.v6i1.3042}}, volume = {{6}}, year = {{2021}}, } @article{24788, author = {{Alhaddad, Samer and Förstner, Jens and Groth, Stefan and Grünewald, Daniel and Grynko, Yevgen and Hannig, Frank and Kenter, Tobias and Pfreundt, Franz‐Josef and Plessl, Christian and Schotte, Merlind and Steinke, Thomas and Teich, Jürgen and Weiser, Martin and Wende, Florian}}, issn = {{1532-0626}}, journal = {{Concurrency and Computation: Practice and Experience}}, keywords = {{tet_topic_hpc}}, pages = {{e6616}}, title = {{{The HighPerMeshes framework for numerical algorithms on unstructured grids}}}, doi = {{10.1002/cpe.6616}}, year = {{2021}}, } @misc{30961, author = {{Lammer, Christina}}, publisher = {{www.kibum.de (Thomas Boyken und Jörn Brüggemann),}}, title = {{{Andrea Karimé: Sterne im Kopf und ein unglaublicher Plan. Köln: Peter Hammer Verlag 2021}}}, year = {{2021}}, } @article{25227, abstract = {{AbstractQuantum well (QW) heterostructures have been extensively used for the realization of a wide range of optical and electronic devices. Exploiting their potential for further improvement and development requires a fundamental understanding of their electronic structure. So far, the most commonly used experimental techniques for this purpose have been all-optical spectroscopy methods that, however, are generally averaging in momentum space. Additional information can be gained by angle-resolved photoelectron spectroscopy (ARPES), which measures the electronic structure with momentum resolution. Here we report on the use of extremely low-energy ARPES (photon energy ~ 7 eV) to increase depth sensitivity and access buried QW states, located at 3 nm and 6 nm below the surface of cubic-GaN/AlN and GaAs/AlGaAs heterostructures, respectively. We find that the QW states in cubic-GaN/AlN can indeed be observed, but not their energy dispersion, because of the high surface roughness. The GaAs/AlGaAs QW states, on the other hand, are buried too deep to be detected by extremely low-energy ARPES. Since the sample surface is much flatter, the ARPES spectra of the GaAs/AlGaAs show distinct features in momentum space, which can be reconducted to the band structure of the topmost surface layer of the QW structure. Our results provide important information about the samples’ properties required to perform extremely low-energy ARPES experiments on electronic states buried in semiconductor heterostructures.}}, author = {{Hajlaoui, Mahdi and Ponzoni, Stefano and Deppe, Michael and Henksmeier, Tobias and As, Donat Josef and Reuter, Dirk and Zentgraf, Thomas and Springholz, Gunther and Schneider, Claus Michael and Cramm, Stefan and Cinchetti, Mirko}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, title = {{{Extremely low-energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/AlGaAs heterostructures}}}, doi = {{10.1038/s41598-021-98569-6}}, volume = {{11}}, year = {{2021}}, }