TY - THES AU - Giese, Patrick ID - 42760 SN - 978-3-8440-8113-8 TI - Methode zur Prognose des Tragverhaltens von Halbhohlstanznietverbindungen ER - TY - THES AU - Janzen, Vitalij ID - 42761 SN - 978-3-8440-8346-0 TI - Weiterentwicklung des einstufigen Widerstandselementschweißens ER - TY - THES AU - Sartisson, Vadim ID - 42764 SN - 978-3-8440-8228-9 TI - Entwicklung eines selbstschließenden Vollstanznietverfahrens für das Fügen ultrahochfester Stahlwerkstoffe mit Aluminiumlegierungen ER - TY - THES AU - Zweck, Jonas ID - 42765 SN - 978-3-8440-8304-0 TI - Robotergeführtes Fließlochformschrauben hochfester Stahlwerkstoffe mit Aluminium-Strangpressprofilen ER - TY - JOUR AU - Fuchs, Christian ID - 41607 JF - 国外社会科学前沿 (International Journal of Social Science) 2021 (4) TI - 受众商品、数字劳动之争、 马克思主义政治经济学与批判理论 (The Audience Commodity, the Digital Labour Debate, Marxist Political Economy, and Critical Theory). ER - TY - THES AU - Janzen, Alexander ID - 42811 SN - 978-3-8439-4847-0 TI - Analyse von elektrischen Wärmeübertragungselementen unter Berücksichtigung des Kristallisationsfoulings in der Warmwasseraufbereitung ER - TY - BOOK ED - Fuchs, Christian ED - Chandler, David ID - 41434 TI - Dijital Nesneler, Digital Özneler - Büyük Veri Çağında Kapitalizm, Emek ve Siyaset Üzerine Disiplinlerarası Yaklaşımlar ER - TY - JOUR AU - Fuchs, Christian ID - 41541 JF - 国外理论动态 (Foreign Theoretical Trends) 2021 (3) TI - 弗洛姆与交往批判理论 ER - TY - JOUR AU - Fuchs, Christian ID - 42483 IS - 2 JF - tripleC: Communication, Capitalism & Critique TI - Preface: Manfred Knoche’s Critique of the Political Economy of the Media and Communication [Preface to the article “Media Concentration” by Manfred Knoche] VL - 19 ER - TY - GEN AU - Kirchgässner, Wilhelm AU - Wallscheid, Oliver AU - Böcker, Joachim ID - 29655 T2 - arXiv preprint arXiv:2103.16323 TI - Thermal Neural Networks: Lumped-Parameter Thermal Modeling With State-Space Machine Learning ER - TY - JOUR AB - In order to reduce the fuel consumption and consequently the greenhouse emissions, the automotive industry is implementing lightweight constructions in the body in white production. As a result, the use of aluminum alloys is continuously increasing. Due to poor weldability of aluminum in combination with other materials, mechanical joining technologies like clinching are increasingly used. In order to predict relevant characteristics of clinched joints and to ensure the reliability of the process, it is simulated numerically during product development processes. In this regard the predictive accuracy of the simulated process highly depends on the implemented friction model. In particular, the frictional behavior between the sheet metals affects the geometrical formation of the clinched joint significantly. This paper presents a testing method, which enables to determine the frictional coefficients between sheet metal materials for the simulation of clinching processes. For this purpose, the correlation of interface pressure and the relative velocity between aluminum sheets in clinching processes is investigated using numerical simulation. Furthermore, the developed testing method focuses on the specimen geometry as well as the reproduction of the occurring friction conditions between two sheet metal materials in clinching processes. Based on a methodical approach the test setup is explained and the functionality of the method is proven by experimental tests using sheet metal material EN AW6014. AU - Rossel, Moritz Sebastian AU - Böhnke, Max AU - Bielak, Christian Roman AU - Bobbert, Mathias AU - Meschut, Gerson ID - 34227 JF - Key Engineering Materials KW - Mechanical Engineering KW - Mechanics of Materials KW - General Materials Science SN - 1662-9795 TI - Development of a Method for the Identification of Friction Coefficients in Sheet Metal Materials for the Numerical Simulation of Clinching Processes VL - 883 ER - TY - JOUR AU - Sherman, David A. AU - Lehmann, Tim AU - Baumeister, Jochen AU - Grooms, Dustin R. AU - Norte, Grant E. ID - 32437 IS - 2 JF - Experimental Brain Research KW - General Neuroscience SN - 0014-4819 TI - Somatosensory perturbations influence cortical activity associated with single-limb balance performance VL - 240 ER - TY - GEN AU - Ludwig, Janis AU - Kykal, Carsten AU - Schmid, Hans-Joachim ID - 27551 KW - aerosol spreading KW - SARS-CoV-2 KW - indoor air filtration T2 - Book of abstracts for the 2021 European Aerosol Conference TI - Assessing spreading and removal of virus laden aerosols in different settings using an aerosol method (Presentation) ER - TY - GEN AU - Ludwig, Janis AU - Schmid, Hans-Joachim ID - 27553 TI - Synthese und asymmetrische Funktionalisierung von submikronen Janus-Polymer-Partikeln in der Gasphase (Poster) ER - TY - CHAP AU - Matzner, Tobias ED - Sprenger, Florian ID - 42904 T2 - Autonome Autos – Die Zukunft des Verkehrs und die Dispositive der Mobilität TI - Die Fussgänger*innen autonomer Kraftfahrzeuge. Eine informatische Dispositivanalyse ER - TY - CONF AU - Lange, Sven AU - Hedayat, Christian AU - Kuhn, Harald AU - Hilleringmann, Ulrich ID - 39401 T2 - 2021 Smart Systems Integration (SSI) TI - Adaptation and Optimization of Planar Coils for a More Accurate and Far-Reaching Magnetic Field-Based Localization in the Near Field ER - TY - CONF AU - Petrov, Dmitry AU - Kroschewski, Konstantin AU - Mwammenywa, Ibrahim AU - Kagarura, G. Mark AU - Hilleringmann, Ulrich ID - 39927 T2 - 2021 IEEE Sensors TI - Low-Cost NB-IoT Microgrid Power Quality Monitoring System ER - TY - CONF AU - Petrov, Dmitry AU - Kroschewski, Konstantin AU - Hilleringmann, Ulrich ID - 39397 T2 - 2021 Smart Systems Integration (SSI) TI - Microcontroller Firmware Design for Industrial Wireless Sensors ER - TY - CONF AU - Reker, Julia AU - Meyers, Thorsten AU - Vidor, Fabio F. AU - Joubert, Trudi-Heleen AU - Hilleringmann, Ulrich ID - 39384 T2 - 2021 IEEE AFRICON TI - Influence of electrode metallization on thin-film transistor performance ER - TY - CONF AU - Sander, Tom AU - Lange, Sven AU - Hilleringmann, Ulrich AU - Geneis, Volker AU - Hedayat, Christian AU - Kuhn, Harald AU - Gockel, Franz-Barthold ID - 39392 T2 - 2021 22nd IEEE International Conference on Industrial Technology (ICIT) TI - Detection of Defects on Irregular Structured Surfaces by Image Processing Methods for Feature Extraction ER - TY - CONF AU - Lange, Sven AU - Schroder, Dominik AU - Hedayat, Christian AU - Kuhn, Harald AU - Hilleringmann, Ulrich ID - 39390 T2 - 2021 22nd IEEE International Conference on Industrial Technology (ICIT) TI - Development of Methods for Coil-Based Localization by Magnetic Fields of Miniaturized Sensor Platforms in Bioprocesses ER - TY - CHAP AU - Hilleringmann, Ulrich ID - 39394 SN - 9780128189009 T2 - Nanostructured Zinc Oxide TI - ZnO nanoparticle films as active layer for thin film transistors ER - TY - CONF AU - Reker, Julia AU - Meyers, Thorsten AU - Vidor, Fabio F. AU - Joubert, Trudi-Heleen AU - Hilleringmann, Ulrich ID - 39396 T2 - 2021 Smart Systems Integration (SSI) TI - Complementary Inverter Circuits on Flexible Substrates ER - TY - CONF AU - Reker, Julia AU - Meyers, Thorsten AU - Vidor, Fabio F. AU - Joubert, Trudi-Heleen AU - Hilleringmann, Ulrich ID - 39388 T2 - 2021 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS) TI - Integration Process for Self-aligned Sub-µm Thin-Film Transistors for Flexible Electronics ER - TY - GEN ID - 41288 TI - Entwicklung einer konstruktionsbasierten französischen Grammatik: ein Arbeitsbericht zum Adjektiv- und Nominalbandd ER - TY - BOOK AU - Siepmann, Dirk AU - Bürgel, Christoph ID - 41221 TI - Grammatik des gesprochenen und geschriebenen Französisch: Das Nomen, VL - 2 ER - TY - GEN ID - 41269 TI - Lexiko-grammatische Konstruktionen als Kern der Spracharbeit im Spanischunterricht, in: Hispanorama ER - TY - GEN ID - 41267 TI - Hörverstehenskompetenz: Spanischstudierende auf dem Prüfstand der Abituraufgaben ER - TY - JOUR AU - Burgfeld-Meise, Bianca AU - Dehmel, Lukas ID - 43148 JF - Zeitschrift MedienPädagogik 42 TI - Subjektwissen als Bildungsperspektive junger Erwachsener. Self-Tracking-Apps als digitale Optimierungstechnologien im Spannungsgefüge von Kontrolle und Selbstermächtigung ER - TY - JOUR AU - Damm, Jannis AU - Albiez, Matthias AU - Göddecke, Johannes AU - Meschut, Gerson AU - Ummenhofer, Thomas ID - 43159 IS - 9 JF - adhäsion KLEBEN & DICHTEN KW - Polymers and Plastics KW - General Chemical Engineering KW - General Chemistry SN - 1619-1919 TI - Dämpfungseigenschaften geklebter Verbindungen - Potenzialanalyse und Klebstoffcharakterisierung VL - 65 ER - TY - JOUR AB - Der Beitrag referiert Ergebnisse studentischer Forschungsprojekte, die sich mit den Folgen der Corona-Pandemie für die berufliche Bildung, für Berufswahl, Berufsvorbereitung und Ausbildung befasst haben. Die Ergebnisse zeigen nicht nur, wie unterschiedlich Berufe und Branchen von der Krise betroffen waren und damit umgegangen sind, sondern geben auch Hinweise auf nötige Weiterentwicklungen zur Verbesserung der Resilienz von Branchen, Berufen, Betrieben und ihrer Ausbildung. AU - Heisler, Dietmar ID - 43179 JF - Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog KW - Pandemie KW - Distanzlernen KW - Berufswahl KW - Ausbildung SN - 00059536 TI - Berufsausbildung in der Corona-Pandemie. Befunde studentischer Forschungsprojekte VL - 192 ER - TY - CHAP AU - Heisler, Dietmar AU - Reißland, Jens AU - Müller, Claudia AU - Rühr, Laura AU - Gröger, Simon ED - Melzig, Christian ED - Kuhlmeier, Werner ED - Kretschmer, Susanne ID - 43182 SN - 978-3-8474-2951-7 T2 - Berufsbildung für nachhaltige Entwicklung. Die Modellversuche 2015-2019 auf dem Weg vom Projekt zur Struktur TI - Das Analyseraster zu Merkmalen eines nachhaltigen Lernortes für betriebliche Ausbilderinnen und Ausbilder. ER - TY - JOUR AB - Im Fokus steht das Problem der Durchlässigkeit von akademischer und beruflicher Bildung im Kontext aktueller Reformen. Die Erhöhung sozialer Mobilität als Reformziel gerät darin zugunsten der Attraktivitätssteigerung von Bildungsgängen aus dem Blick. Die geringe Durchlässigkeit von Bildungsgängen wird primär als Marketingproblem thematisiert. AU - Heisler, Dietmar ID - 43178 JF - Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog KW - allgemeine Bildung KW - berufliche BIldung KW - Durchlässigkeit im Bildungssystem SN - 00059536 TI - Berufsausbildung zwischen Attraktivitätsverlust und sozialer Ungleichheit Reformen für mehr Durchlässigkeit zwischen beruflicher und akademischer Bildung VL - 191 ER - TY - JOUR AB - We show the existence of ground states in the massless spin boson model without any infrared regularization. Our proof is non-perturbative and relies on a compactness argument. It works for arbitrary values of the coupling constant under the hypothesis that the second derivative of the ground state energy as a function of a constant external magnetic field is bounded. AU - Hasler, David AU - Hinrichs, Benjamin AU - Siebert, Oliver ID - 43465 IS - 1 JF - Communications in Mathematical Physics SN - 0010-3616 TI - On Existence of Ground States in the Spin Boson Model VL - 388 ER - TY - GEN AU - Schroeter-Wittke, Harald ID - 41089 SN - 0540–6226 T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes TI - Andrea Strübind / Klaas-Dieter Voß (Hgg.), Märtyrerbücher und ihre Bedeutung für konfessionelle Identität und Spiritualität in der Frühen Neuzeit. Interkonfessionelle und interdisziplinäre Beiträge zur Erforschung einer Buchgattung (SMHR 109), Tübingen 2019 VL - 70 ER - TY - GEN AU - Schroeter-Wittke, Harald ID - 41087 SN - 0540–6226 T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes TI - Stefan Alkier (Hg.), Sola Scriptura 1517-2017. Rekonstruktionen – Kritiken – Transformationen – Performanzen (CHTh 7), Tübingen 2019 VL - 70 ER - TY - CONF AU - Ahmed, Qazi Arbab ID - 29138 T2 - 2021 IFIP/IEEE 29th International Conference on Very Large Scale Integration (VLSI-SoC) TI - Hardware Trojans in Reconfigurable Computing ER - TY - JOUR AU - Schulze, Johanna ID - 43389 JF - GGG-Magazin: DIE SCHULE für alle TI - Einzelschulentwicklung gerecht und digital – Einblicke in die empirische Lage und Konsequenzen für die Praxis. VL - 4 ER - TY - BOOK AU - Schulze, Johanna ID - 43388 TI - Medienkonzepte zur chancengerechten Schulentwicklung. Fallstudien an Schulen mit besonders herausfordernden Schüler*innenkompositionen. ER - TY - JOUR AU - Luo, Kai Hong AU - Santandrea, Matteo AU - Stefszky, Michael AU - Sperling, Jan AU - Massaro, Marcello AU - Ferreri, Alessandro AU - Sharapova, Polina AU - Herrmann, Harald AU - Silberhorn, Christine ID - 26889 JF - Physical Review A SN - 2469-9926 TI - Quantum optical coherence: From linear to nonlinear interferometers ER - TY - JOUR AU - Lüders, Carolin AU - Pukrop, Matthias AU - Rozas, Elena AU - Schneider, Christian AU - Höfling, Sven AU - Sperling, Jan AU - Schumacher, Stefan AU - Aßmann, Marc ID - 26283 JF - PRX Quantum SN - 2691-3399 TI - Quantifying Quantum Coherence in Polariton Condensates ER - TY - JOUR AU - Bagrets, Dmitry AU - Kim, Kun Woo AU - Barkhofen, Sonja AU - De, Syamsundar AU - Sperling, Jan AU - Silberhorn, Christine AU - Altland, Alexander AU - Micklitz, Tobias ID - 26284 JF - Physical Review Research SN - 2643-1564 TI - Probing the topological Anderson transition with quantum walks ER - TY - JOUR AU - Xue, Yan AU - Chestnov, Igor AU - Sedov, Evgeny AU - Kiktenko, Evgeniy AU - Fedorov, Aleksey K. AU - Schumacher, Stefan AU - Ma, Xuekai AU - Kavokin, Alexey ID - 21362 IS - 1 JF - Physical Review Research SN - 2643-1564 TI - Split-ring polariton condensates as macroscopic two-level quantum systems VL - 3 ER - TY - JOUR AU - Jurgen von Bardeleben, Hans AU - Cantin, Jean-Louis AU - Gerstmann, Uwe AU - Schmidt, Wolf Gero AU - Biktagirov, Timur ID - 29747 IS - 19 JF - Nano Letters KW - Mechanical Engineering KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry KW - Bioengineering SN - 1530-6984 TI - Spin Polarization, Electron–Phonon Coupling, and Zero-Phonon Line of the NV Center in 3C-SiC VL - 21 ER - TY - JOUR AU - Slawig, Diana AU - Gruschwitz, Markus AU - Gerstmann, Uwe AU - Rauls, Eva AU - Tegenkamp, Christoph ID - 29748 IS - 36 JF - The Journal of Physical Chemistry C KW - Surfaces KW - Coatings and Films KW - Physical and Theoretical Chemistry KW - General Energy KW - Electronic KW - Optical and Magnetic Materials SN - 1932-7447 TI - Adsorption and Reaction of PbPc on Hydrogenated Epitaxial Graphene VL - 125 ER - TY - JOUR AU - Jain, Mitisha AU - Gerstmann, Uwe AU - Schmidt, Wolf Gero AU - Aldahhak, Hazem ID - 40250 IS - 6 JF - Journal of Computational Chemistry KW - Computational Mathematics KW - General Chemistry SN - 0192-8651 TI - Adatom mediated adsorption of N‐heterocyclic carbenes on Cu(111) and Au(111) VL - 43 ER - TY - JOUR AB - High harmonic generation (HHG) from solids shows great application prospects in compact short-wavelength light sources and as a tool for imaging the dynamics in crystals with subnanometer spatial and attosecond temporal resolution. However, the underlying collision dynamics behind solid HHG is still intensively debated and no direct mapping relationship between the collision dynamics with band structure has been built. Here, we show that the electron and its associated hole can be elastically scattered by neighboring atoms when their wavelength approaches the atomic size. We reveal that the elastic scattering of electron/hole from neighboring atoms can dramatically influence the electron recombination with its left-behind hole, which turns out to be the fundamental reason for the anisotropic interband HHG observed recently in bulk crystals. Our findings link the electron/hole backward scattering with Van Hove singularities and forward scattering with critical lines in the band structure and thus build a clear mapping between the band structure and the harmonic spectrum. Our work provides a unifying picture for several seemingly unrelated experimental observations and theoretical predictions, including the anisotropic harmonic emission in MgO, the atomic-like recollision mechanism of solid HHG, and the delocalization of HHG in ZnO. This strongly improved understanding will pave the way for controlling the solid-state HHG and visualizing the structure-dependent electron dynamics in solids. AU - Zuo, Ruixin AU - Trautmann, Alexander AU - Wang, Guifang AU - Hannes, Wolf-Rüdiger AU - Yang, Shidong AU - Song, Xiaohong AU - Meier, Torsten AU - Ciappina, Marcelo AU - Duc, Huynh Thanh AU - Yang, Weifeng ID - 37331 JF - Ultrafast Science SN - 2765-8791 TI - Neighboring Atom Collisions in Solid-State High Harmonic Generation VL - 2021 ER - TY - JOUR AB - AbstractMethylammonium lead iodide perovskite (MAPbI3) is renowned for an impressive power conversion efficiency rise and cost-effective fabrication for photovoltaics. In this work, we demonstrate that polycrystalline MAPbI3s undergo drastic changes in optical properties at moderate field strengths with an ultrafast response time, via transient Wannier Stark localization. The distinct band structure of this material - the large lattice periodicity, the narrow electronic energy bandwidths, and the coincidence of these two along the same high-symmetry direction – enables relatively weak fields to bring this material into the Wannier Stark regime. Its polycrystalline nature is not detrimental to the optical switching performance of the material, since the least dispersive direction of the band structure dominates the contribution to the optical response, which favors low-cost fabrication. Together with the outstanding photophysical properties of MAPbI3, this finding highlights the great potential of this material in ultrafast light modulation and novel photonic applications. AU - Berghoff, Daniel AU - Bühler, Johannes AU - Bonn, Mischa AU - Leitenstorfer, Alfred AU - Meier, Torsten AU - Kim, Heejae ID - 37338 IS - 1 JF - Nature Communications KW - General Physics and Astronomy KW - General Biochemistry KW - Genetics and Molecular Biology KW - General Chemistry KW - Multidisciplinary SN - 2041-1723 TI - Low-field onset of Wannier-Stark localization in a polycrystalline hybrid organic inorganic perovskite VL - 12 ER - TY - JOUR AU - Thong, Le Huu AU - Ngo, Cong AU - Duc, Huynh Thanh AU - Song, Xiaohong AU - Meier, Torsten ID - 23477 JF - Physical Review B SN - 2469-9950 TI - Microscopic analysis of high harmonic generation in semiconductors with degenerate bands VL - 103 ER - TY - JOUR AB - 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. AU - Schmidt, Falko AU - Kozub, Agnieszka L. AU - Gerstmann, Uwe AU - Schmidt, Wolf Gero AU - Schindlmayr, Arno ID - 21946 JF - Crystals TI - Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response VL - 11 ER - TY - CONF AB - Population/mixing-time-dependent two-dimensional coherent spectra are presented for exciton-polaritons in a microcavity. Theory based on dynamically-controlled truncation reveals coherent and incoherent contributions to the decay dynamics. AU - Meier, Torsten AU - Paul, Jagannath AU - Rose, Hendrik AU - Wahlstrand, Jared K AU - Bristow, Alan D ID - 43746 SN - 978-1-55752-308-2 T2 - Frontiers in Optics TI - Coherent and incoherent contribution of population dynamics of semiconductor exciton-polaritons ER - TY - CONF AU - Reichelt, Matthias AU - Rose, Hendrik AU - Kosarev, Alexander N. AU - Poltavtsev, Sergey V. AU - Bayer, Manfred AU - Akimov, Ilya A. AU - Schneider, Christian AU - Kamp, Martin AU - Höfling, Sven AU - Meier, Torsten ED - Betz, Markus ED - Elezzabi, Abdulhakem Y. ID - 23474 T2 - Ultrafast Phenomena and Nanophotonics XXV TI - Controlling the emission time of photon echoes by optical freezing of exciton dephasing and rephasing in quantum-dot ensembles VL - 11684 ER - TY - JOUR AU - Murzakhanov, F. F. AU - Yavkin, B. V. AU - Mamin, G. V. AU - Orlinskii, S. B. AU - von Bardeleben, H. J. AU - Biktagirov, Timur AU - Gerstmann, Uwe AU - Soltamov, V. A. ID - 29749 JF - Physical Review B SN - 2469-9950 TI - Hyperfine and nuclear quadrupole splitting of the NV− ground state in 4H-SiC VL - 103 ER - TY - JOUR AU - Aldahhak, Hazem AU - Hogan, Conor AU - Lindner, Susi AU - Appelfeller, Stephan AU - Eisele, Holger AU - Schmidt, Wolf Gero AU - Dähne, Mario AU - Gerstmann, Uwe AU - Franz, Martin ID - 22010 JF - Physical Review B SN - 2469-9950 TI - Electronic structure of the Si(111)3×3R30∘−B surface from theory and photoemission spectroscopy VL - 103 ER - TY - JOUR AU - Rose, Hendrik AU - Popolitova, D. V. AU - Tikhonova, O. V. AU - Meier, Torsten AU - Sharapova, Polina ID - 23478 JF - Physical Review A SN - 2469-9926 TI - Dark-state and loss-induced phenomena in the quantum-optical regime of Λ-type three-level systems VL - 103 ER - TY - JOUR AU - Belobo, Didier Belobo AU - Meier, Torsten ID - 23473 JF - New Journal of Physics SN - 1367-2630 TI - Approximate nonlinear wave solutions of the coupled two-component Gross–Pitaevskii equations with spin–orbit interaction VL - 23 ER - TY - JOUR AU - Nguyen, T. T. Nhung AU - Sollfrank, T. AU - Tegenkamp, C. AU - Rauls, E. AU - Gerstmann, Uwe ID - 22881 JF - Physical Review B SN - 2469-9950 TI - Impact of screening and relaxation on weakly coupled two-dimensional heterostructures VL - 103 ER - TY - JOUR AB - Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum. AU - Borgert, Thomas AU - Homberg, Werner ID - 21635 JF - Metals SN - 2075-4701 TI - Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production ER - TY - CONF AU - Moritzer, Elmar AU - Flachmann, Felix ID - 23746 SN - 978-1-7138-3075-7 T2 - SPE ANTEC 2021: The Annual Technical Conference for Plastic Professionals TI - Influence of Chemical Blowing Agents on the Filling Behavior of Wood-Plastic-Composite Melts ER - TY - JOUR AU - Bolenz, Lukas AU - Ehlert, Thomas AU - Dechert, Christopher AU - Bertling, René AU - Kenig, Eugeny ID - 23789 JF - Chemical Engineering Research and Design SN - 0263-8762 TI - Modelling of a continuous distillation process with finite reflux ratio using the hydrodynamic analogy approach ER - TY - CONF AB - Driven by the CO2-emission law by the European government and the increasing costs for raw materials as well as energy, the automotive industry is increasingly using multi-material constructions. This leads to a continuous increase in the use of mechanical joining techniques and especially the self-piercing riveting is of particular importance. The reason for this is the wide range of joining possibilities as well as the high load-bearing capacities of the joints. To be able to react to changing boundary conditions, like material thickness or strength variation of the sheets, research work is crucial with regard to the increase of versatility. In this paper, a numerical study of the influences on the selfpiercing riveting process is presented. For this purpose, the influence of different process parameters such as rivet length and die depth on various quality-relevant characteristics were investigated. With the help of the design of experiment, significant influences were determined and interactions between the individual parameters are shown. AU - Kappe, Fabian AU - Bielak, Christian Roman AU - Sartisson, Vadim AU - Bobbert, Mathias AU - Meschut, Gerson ID - 34222 T2 - ESAFORM 2021 TI - Influence of rivet length on joint formation on self-piercing riveting process considering further process parameters ER - TY - CONF AB - In many areas of product manufacturing constructions consist of individual components and metal sheets that are joined together to form complex structures. A simple and industrial common method for joining dissimilar and coated materials is clinching. During the joining process and due to the service load cracks can occur in the area of the joint, propagate due to cyclic loading and consequently lead to structural failure. For the prevention of these damage cases, first of all knowledge about the fracture mechanical material parameters regarding the original material state of the sheet metals used within the clinching process are essential.Within the scope of this paper experimental and numerical preliminary investigations regarding the fracture mechanical behavior of sheet metals used within the clinching process are presented. Due to the low thickness of 1.5 mm of the material sheets, the development of a new specimen is necessary to determine the crack growth rate curve including the fracture mechanical parameters like the threshold against crack growth ΔKI,th and the fracture toughness KIC of the base material HCT590X. For the experimental determination of the crack growth rate curve the numerical calculation of the geometry factor function as well as the calibration function of this special specimen are essential. After the experimental validation of the numerically determined calibration function, crack growth rate curves are determined for the stress ratios R = 0.1 and R = 0.3 to examine the mean stress sensitivity. In addition, the different rolling directions of 0° and 90° in relation to the initial crack are taken into account in order to investigate the influence of the anisotropy due to rolling. AU - Weiß, Deborah AU - Schramm, Britta AU - Kullmer, Gunter ID - 30675 KW - Mechanical Engineering KW - Mechanics of Materials KW - General Materials Science SN - 1662-9795 T2 - Key Engineering Materials TI - Numerical and Experimental Fracture Mechanical Investigations of Clinchable Sheet Metals Made of HCT590X VL - 883 ER - TY - JOUR AB - AbstractIn addition to the classical strength calculation, it is important to design components with regard to fracture mechanics because defects and cracks in a component can drastically influence its strength or fatigue behavior. Cracks can propagate due to operational loads and consequently lead to component failure. The fracture mechanical analysis provides information on stable or unstable crack growth as well as about the direction and the growth rate of a crack. For this purpose, sufficient information has to be available about the crack location, the crack length, the component geometry, the component loading and the fracture mechanical material parameters. The fracture mechanical properties are determined experimentally with standardized specimens as defined by the guidelines of the American Society for Testing and Materials. In practice, however, especially in the context with damage cases or formed material fracture mechanical parameters directly for a component are of interest. However, standard specimens often cannot be extracted at all due to the complexity of the component geometry. Therefore, the development of special specimens is required whereby certain arrangements have to be made in advance. These arrangements are presented in the present paper in order to contribute to a holistic investigation chain for the experimental determination of fracture mechanical material parameters with special specimens. AU - Weiß, Deborah AU - Schramm, Britta AU - Kullmer, Gunter ID - 30674 JF - Production Engineering KW - Industrial and Manufacturing Engineering KW - Mechanical Engineering SN - 0944-6524 TI - Holistic investigation chain for the experimental determination of fracture mechanical material parameters with special specimens ER - TY - JOUR AB - Powder X-ray diffraction (XRD) patterns of ordered mesoporous CMK-8 and CMK-9 carbon materials are simulated by geometric modeling. The materials are amorphous at the atomic length scale but exhibit highly symmetric gyroidal structures at the nanometer scale, corresponding to regular, continuous nanopore systems with cubic symmetry. Their structures lead to characteristic low-angle XRD signatures. We introduce a model based on geometrical considerations to simulate CMK-8 and CMK-9 structures with variable volume fraction of carbon (vs. pore volume, i.e., variable 'pore wall thickness'). In addition, we also simulate carbon materials with variable amounts of guest species (e.g., sulfur) residing in their pores. The corresponding XRD patterns are calculated. The carbon volume fraction turns out to have a significant impact on the relative diffraction peak intensities, especially in case of CMK-9 carbon that features a bimodal porosity. Likewise, the presence of guest species in the pores may also strongly affect the relative peak intensities. Our study suggests that careful evaluation of experimental low-angle XRD patterns of (real) CMK-8 or CMK-9 materials offers an opportunity to obtain detailed information about the nanostructural properties in addition to the mere identification of the pore systems geometry. AU - Schwind, Bertram AU - Smått, Jan-Henrik AU - Tiemann, Michael AU - Weinberger, Christian ID - 25894 JF - Microporous and Mesoporous Materials SN - 1387-1811 TI - Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns ER - TY - JOUR AB - A comparison of infrared spectroscopic analytical approaches was made in order to assess their applicability for internal structure characterization of SiO2 thin films. Markers for porosity and/or disorder based on the analysis of the asymmetric stretching absorption band of SiO2 between 900−1350 cm−1 were discussed. The shape of this band, which shows a well-defined LO–TO splitting, depends not only on the inherent characteristics of the film under analysis but also on the particular geometry of the IR experiment and the specific surface selection rules of the substrate. Three types of SiO2 thin films with clearly defined porosity ranging from dense films to mesoporous films were investigated by transmission (at different incidence angles), direct specular reflection (at different angles), and diffuse reflection. Two different types of substrate, metallic and semiconducting, were used. The combined effect of substrate and specific technique in the final shape of the band, was discussed, and the efficacy for their applicability to the determination of porosity in thin SiO2 films was critically evaluated. AU - de los Arcos, Teresa AU - Müller, Hendrik AU - Wang, Fuzeng AU - Damerla, Varun Raj AU - Hoppe, Christian AU - Weinberger, Christian AU - Tiemann, Michael AU - Grundmeier, Guido ID - 25897 JF - Vibrational Spectroscopy SN - 0924-2031 TI - Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films ER - TY - THES AU - Olenberg, Alexander ID - 42812 SN - 9783843947855 TI - Untersuchung und Optimierung von strukturierten Packungen mittels CFD-Simulationen ER - TY - JOUR AB - 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. AU - Tiemann, Michael AU - Weinberger, Christian ID - 25893 JF - Advanced Materials Interfaces SN - 2196-7350 TI - Selective Modification of Hierarchical Pores and Surfaces in Nanoporous Materials ER - TY - JOUR AU - Fuchs, Christian ID - 41431 IS - 1 JF - tripleC: Communication, Capitalism & Critique TI - Engels@200: Friedrich Engels in the Age of Digital Capitalism VL - 19 ER - TY - JOUR AU - Fuchs, Christian AU - Dyer-Witheford, Nick ID - 41599 JF - 国际社会科学杂志 (Journal of International Social Sciences) 2021 (9) TI - 卡尔·马克思与互联网研究 ER - TY - JOUR AB - In this report, a flame spray pyrolysis setup has been examined with various in situ extraction methods of particle samples along the flame axis. First, two precursor formulations leading to the formation of iron oxide nanoparticles were used in a standardized SpraySyn burner system, and the final particle outcome was characterized by a broad range of established powder characterization techniques (TEM/HRTEM, SAXS, XRD, BET). The characterization of the powder products evidenced that mostly homogeneous gas-to-particle conversion takes place when applying an acidic precursor solution, whereas the absence of the acid leads to a dominant droplet-to-particle pathway. Our study indicates that a droplet-to-particle-pathway could be present even when processing the acidic formulation. However, even if a secondary pathway might take place in this case as well, it is not dominant and nearly negligible. Subsequently, the in situ particle structure evolution was investigated for the dominant gas-to-particle pathway, and particles were extracted along the flame axis for online SMPS and offline TEM/HRTEM analysis. Due to the highly reactive conditions within the flame (high temperatures, turbulent flow field, high particle number concentrations), the extraction of representative samples from spray flames is challenging. In order to handle the reactive conditions, two extraction techniques were tailored in this report. To extract an aerosol sample within the flame for SMPS measurement, a Hole in a Tube probe was adjusted. Thus, the mobility particle diameter as well as the corresponding distribution widths were obtained at different heights above the burner along the flame axis. For TEM/HRTEM image analysis, particle samples were collected thermophoretically by means of a tailored shutter system. Since all sampling grids were protected until reaching the flame axis and due to the low sampling time, momentary captures of local particle structures could be extracted precisely. The particle morphologies have clearly shown an evolution from spherical and paired particles in the flame center to fractal and compact agglomerates at later synthesis stages. AU - Tischendorf, R. AU - Simmler, M. AU - Weinberger, Christian AU - Bieber, M. AU - Reddemann, M. AU - Fröde, F. AU - Lindner, J. AU - Pitsch, H. AU - Kneer, R. AU - Tiemann, Michael AU - Nirschl, H. AU - Schmid, H.-J. ID - 25896 JF - Journal of Aerosol Science SN - 0021-8502 TI - Examination of the evolution of iron oxide nanoparticles in flame spray pyrolysis by tailored in situ particle sampling techniques ER - TY - JOUR AB - Photodynamic therapy (PDT) using TiO2 nanoparticles has become an important alternative treatment for different types of cancer due to their high photocatalytic activity and high absorption of UV-A light. To potentiate this treatment, we have coated commercial glass plates with TiO2 nanoparticles prepared by the sol–gel method (TiO2-m), which exhibit a remarkable selectivity for the irreversible trapping of cancer cells. The physicochemical properties of the deposited TiO2-m nanoparticle coatings have been characterized by a number of complementary surface-analytical techniques and their interaction with leukemia and healthy blood cells were investigated. Scanning electron and atomic force microscopy verify the formation of a compact layer of TiO2-m nanoparticles. The particles are predominantly in the anatase phase and have hydroxyl-terminated surfaces as revealed by Raman, X-ray photoelectron, and infrared spectroscopy, as well as X-ray diffraction. We find that lymphoblastic leukemia cells adhere to the TiO2-m coating and undergo amoeboid-like migration, whereas lymphocytic cells show distinctly weaker interactions with the coating. This evidences the potential of this nanomaterial coating to selectively trap cancer cells and renders it a promising candidate for the development of future prototypes of PDT devices for the treatment of leukemia and other types of cancers with non-adherent cells. AU - Garcia Diosa, Jaime Andres AU - Gonzalez Orive, Alejandro AU - Weinberger, Christian AU - Schwiderek, Sabrina AU - Knust, Steffen AU - Tiemann, Michael AU - Grundmeier, Guido AU - Keller, Adrian AU - Camargo Amado, Ruben Jesus ID - 22635 JF - Journal of Biomedical Materials Research Part B: Applied Biomaterials SN - 1552-4973 TI - TiO2 nanoparticle coatings on glass surfaces for the selective trapping of leukemia cells from peripheral blood VL - 109 ER - TY - JOUR AB - The tetratopic linker 1,1,2,2-tetrakis(4-phosphonophenyl)ethylene (H8TPPE) was used to synthesize the three new porous metal–organic frameworks of composition [M2(H2O)2(H2TPPE)]·xH2O (M = Al3+, Ga3+, Fe3+), denoted as M-CAU-53 under hydrothermal reaction conditions, using the corresponding metal nitrates as starting materials. The crystal structures of the compounds were determined ab initio from powder X-ray diffraction data, revealing small structural differences. Proton conductivity measurements were carried out, indicating different conductivity mechanisms. The differences in proton conductivity could be linked to the individual structures. In addition, a thorough characterization via thermogravimetry, elemental analysis, IR-spectroscopy as well as N2- and H2O-sorption is given. AU - Steinke, Felix AU - Javed, Ali AU - Wöhlbrandt, Stephan AU - Tiemann, Michael AU - Stock, Norbert ID - 25892 JF - Dalton Transactions SN - 1477-9226 TI - New isoreticular phosphonate MOFs based on a tetratopic linker ER - TY - CHAP AU - Eickelmann, Birgit ID - 29061 T2 - Chancen denken. Impulse für eine offene und mutige Gesellschaft im 21. Jahrhundert TI - Etwas anarchischer, freier, ungewohnter (Ein Gespräch mit Birgit Eickelmann) ER - TY - CHAP AU - Eickelmann, Birgit AU - Maaz, Kai ED - Maaz, Kai ED - Becker-Mrotzek, Michael ID - 29062 T2 - Schule weiter denken TI - Ungleichheiten im Bildungssystem – eine unangenehme Konstante. Sinnvolle Maßnahmen und die Grenzen des Möglichen ER - TY - GEN AU - Bonanati, Sabrina AU - Buhl, Heike M. AU - Eickelmann, Birgit ID - 29066 TI - Wie Lernen in digitalen Lernumgebungen motivieren kann – Stichwort: Gamification ER - TY - JOUR AB - Abstract Objective External focus (EF) of attention leads to improved balance performance. Consideration of the neuromodulatory effects of EF may inform its clinical utility in addressing neuroplastic impairments after musculoskeletal injuries. We aimed to determine whether electrocortical activity and balance performance changed with attentional foci that prioritized differing sensory feedback and whether changes in electrocortical activity and balance were associated. Methods Individuals who were healthy (n = 15) performed a single-limb balance task under 3 conditions: internal focus (IF), somatosensory focus [EF with a baton (EF-baton)], and visual focus [EF with a laser (EF-laser)]. Electrocortical activity and postural sway were recorded concurrently using electroencephalography and a triaxial force plate. Electroencephalographic signals were decomposed, localized, and clustered to generate power spectral density in θ and α-2 frequency bands. Postural sway signals were analyzed with center-of-pressure sway metrics (eg, area, distance, velocity) and knee angle. The relationship between percent change in clustered brain activity and task performance metrics was assessed. Results Both EF conditions resulted in increased cortical activity and improved balance performance compared to IF. EF-laser had the largest effect, demonstrating increased frontal θ power (d = 0.64), decreased central θ power (d = −0.30), and decreased bilateral motor, bilateral parietal, and occipital α-2 power (d = −1.38 to −4.27) as well as a shorter path distance (d = −0.94) and a deeper (d = 0.70) and less variable (d = −1.15) knee angle than IF. Weak to moderate associations exist between increases in cortical activity and improved balance performance (ρ = 0.405–0.584). Conclusions EF resulted in increased cortical activity associated with cognitive, motor, somatosensory, and visual processing. EF-laser, which prioritized visual feedback, had the largest and broadest effects. Changes in cortical activity resulting from EF were independently associated with improved balance performance. Impact This study demonstrates that goal-oriented attention results in functional increases in brain activity compared to internally directed self-focus. These results suggest EF may target neurophysiologic impairments and improve balance in clinical populations. AU - Sherman, David A AU - Lehmann, Tim AU - Baumeister, Jochen AU - Gokeler, Alli AU - Donovan, Luke AU - Norte, Grant E ID - 34024 JF - Physical Therapy KW - Physical Therapy KW - Sports Therapy and Rehabilitation SN - 0031-9023 TI - External Focus of Attention Influences Cortical Activity Associated with Single Limb Balance Performance ER - TY - JOUR AB - Whereas initial findings have already identified cortical patterns accompanying proprioceptive deficiencies in patients after anterior cruciate ligament reconstruction (ACLR), little is known about compensatory sensorimotor mechanisms for re-establishing postural control. Therefore, the aim of the present study was to explore leg dependent patterns of cortical contributions to postural control in patients 6 weeks following ACLR. A total of 12 patients after ACLR (25.1 ± 3.2 years, 178.1 ± 9.7 cm, 77.5 ± 14.4 kg) and another 12 gender, age, and activity matched healthy controls participated in this study. All subjects performed 10 × 30 s. single leg stances on each leg, equipped with 64-channel mobile electroencephalography (EEG). Postural stability was quantified by area of sway and sway velocity. Estimations of the weighted phase lag index were conducted as a cortical measure of functional connectivity. The findings showed significant group × leg interactions for increased functional connectivity in the anterior cruciate ligament (ACL) injured leg, predominantly including fronto−parietal [F(1, 22) = 8.41, p ≤ 0.008, η2 = 0.28], fronto−occipital [F(1, 22) = 4.43, p ≤ 0.047, η2 = 0.17], parieto−motor [F(1, 22) = 10.30, p ≤ 0.004, η2 = 0.32], occipito−motor [F(1, 22) = 5.21, p ≤ 0.032, η2 = 0.19], and occipito−parietal [F(1, 22) = 4.60, p ≤ 0.043, η2 = 0.17] intra−hemispherical connections in the contralateral hemisphere and occipito−motor [F(1, 22) = 7.33, p ≤ 0.013, η2 = 0.25] on the ipsilateral hemisphere to the injured leg. Higher functional connectivity in patients after ACLR, attained by increased emphasis of functional connections incorporating the somatosensory and visual areas, may serve as a compensatory mechanism to control postural stability of the injured leg in the early phase of rehabilitation. These preliminary results may help to develop new neurophysiological assessments for detecting functional deficiencies after ACLR in the future. AU - Lehmann, Tim AU - Büchel, Daniel AU - Mouton, Caroline AU - Gokeler, Alli AU - Seil, Romain AU - Baumeister, Jochen ID - 32434 JF - Frontiers in Human Neuroscience KW - Behavioral Neuroscience KW - Biological Psychiatry KW - Psychiatry and Mental health KW - Neurology KW - Neuropsychology and Physiological Psychology SN - 1662-5161 TI - Functional Cortical Connectivity Related to Postural Control in Patients Six Weeks After Anterior Cruciate Ligament Reconstruction VL - 15 ER - TY - JOUR AB - Abstract Mobile Electroencephalography (EEG) provides insights into cortical contributions to postural control. Although changes in theta (4–8 Hz) and alpha frequency power (8–12 Hz) were shown to reflect attentional and sensorimotor processing during balance tasks, information about the effect of stance leg on cortical processing related to postural control is lacking. Therefore, the aim was to examine patterns of cortical activity during single-leg stance with varying surface stability. EEG and force plate data from 21 healthy males (22.43 ± 2.23 years) was recorded during unipedal stance (left/right) on a stable and unstable surface. Using source-space analysis, power spectral density was analyzed in the theta, alpha-1 (8–10 Hz) and alpha-2 (10–12 Hz) frequency bands. Repeated measures ANOVA with the factors leg and surface stability revealed significant interaction effects in the left (p = 0.045, ηp2 = 0.13) and right motor clusters (F = 16.156; p = 0.001, ηp2 = 0.41). Furthermore, significant main effects for surface stability were observed for the fronto-central cluster (theta), left and right motor (alpha-1), as well as for the right parieto-occipital cluster (alpha-1/alpha-2). Leg dependent changes in alpha-2 power may indicate lateralized patterns of cortical processing in motor areas during single-leg stance. Future studies may therefore consider lateralized patterns of cortical activity for the interpretation of postural deficiencies in unilateral lower limb injuries. AU - Büchel, Daniel AU - Lehmann, Tim AU - Ullrich, Sarah AU - Cockcroft, John AU - Louw, Quinette AU - Baumeister, Jochen ID - 32435 IS - 4 JF - Experimental Brain Research KW - General Neuroscience SN - 0014-4819 TI - Stance leg and surface stability modulate cortical activity during human single leg stance VL - 239 ER - TY - JOUR AU - Büchel, Daniel AU - Lehmann, Tim AU - Sandbakk, Øyvind AU - Baumeister, Jochen ID - 35626 IS - 1 JF - Scientific Reports KW - Multidisciplinary SN - 2045-2322 TI - EEG‑derived brain graphs are reliable measures for exploring exercise‑induced changes in brain networks VL - 11 ER - TY - GEN AU - Neukötter, Moritz AU - Jesinghausen, Steffen AU - Schmid, Hans-Joachim ID - 24475 TI - Theoretische Beschreibung des Tropfenbildungsprozesses bei der Filament Extension Atomization: Entwicklung eines Vorhersagemodells für die Tropfengröße (Poster) ER - TY - GEN AU - Neukötter, Moritz AU - Jesinghausen, Steffen AU - Schmid, Hans-Joachim ID - 30221 TI - Filament Extension Atomization – A novel Process for Powder Production? (Presentation) ER - TY - JOUR AU - Möhring, Julia AU - Krumhöfner, Anika AU - Gräfin von Plettenberg, Elisabeth Gudila Sophia Ida Maria ID - 43016 JF - - TI - Bewegungsförderung in Ganztagsschulen ER - TY - GEN AU - Leineweber, Jonas ID - 33210 TI - Veranstaltungsbericht: Immaterielles Kulturerbe in Nordrhein-Westfalen – Steigerlied und Trinkhallenkultur im Ruhrgebiet erhalten Auszeichnung anlässlich der Neuaufnahmen in das nordrhein-westfälische Landesinventar ER - TY - GEN AU - Leineweber, Jonas ID - 33209 TI - Tagungsbericht: Immaterielles Kulturerbe und regionale Identität. Gesellschaftliche Repräsentation und Partizipation im Schützenwesen ER - TY - JOUR AB - Zinc oxide nanoparticles (ZnO NP) used for the channel region in inverted coplanar setup in Thin Film Transistors (TFT) were the focus of this study. The regions between the source electrode and the ZnO NP and the drain electrode were under investigation as they produce a Schottky barrier in metal-semiconductor interfaces. A more general Thermionic emission theory must be evaluated: one that considers both metal/semiconductor interfaces (MSM structures). Aluminum, gold, and nickel were used as metallization layers for source and drain electrodes. An organic-inorganic nanocomposite was used as a gate dielectric. The TFTs transfer and output characteristics curves were extracted, and a numerical computational program was used for fitting the data; hence information about Schottky Barrier Height (SBH) and ideality factors for each TFT could be estimated. The nickel metallization appears with the lowest SBH among the metals investigated. For this metal and for higher drain-to-source voltages, the SBH tended to converge to some value around 0.3 eV. The developed fitting method showed good fitting accuracy even when the metallization produced different SBH in each metal-semiconductor interface, as was the case for gold metallization. The Schottky effect is also present and was studied when the drain-to-source voltages and/or the gate voltage were increased. AU - Kaufmann, Ivan Rodrigo AU - Zerey, Onur AU - Meyers, Thorsten AU - Reker, Julia AU - Vidor, Fábio AU - Hilleringmann, Ulrich ID - 39383 IS - 5 JF - Nanomaterials KW - General Materials Science KW - General Chemical Engineering SN - 2079-4991 TI - A Study about Schottky Barrier Height and Ideality Factor in Thin Film Transistors with Metal/Zinc Oxide Nanoparticles Structures Aiming Flexible Electronics Application VL - 11 ER - TY - CONF AU - Reker, Julia AU - Meyers, Thorsten AU - Vidor, Fabio F. AU - Joubert, Trudi-Heleen AU - Hilleringmann, Ulrich ID - 39395 T2 - 2021 Smart Systems Integration (SSI) TI - Complementary Inverter Circuits on Flexible Substrates ER - TY - CONF AU - Hilleringmann, Ulrich AU - Petrov, Dmitry AU - Mwammenywa, Ibrahim AU - Kagarura, Geoffrey M. ID - 39381 T2 - 2021 IEEE AFRICON TI - Local Power Control using Wireless Sensor System for Microgrids in Africa ER - TY - CONF AU - Andrews, George AU - Hilleringmann, Ulrich AU - Joubert, Trudi-Heleen ID - 39385 T2 - 2021 IEEE AFRICON TI - The Viability of a Non-Flow Capacitive Biosensing Microsystem for Whole Cell Counting ER - TY - CONF AU - Andrews, George AU - Hilleringmann, Ulrich AU - Joubert, Trudi-Heleen ID - 39386 T2 - 2021 IEEE AFRICON TI - The Viability of a Non-Flow Capacitive Biosensing Microsystem for Whole Cell Counting ER - TY - CHAP AU - Gerhardts, Lara AU - Dehmel, Lukas AU - Meister, Dorothee M. ED - Wolf, Karsten D ED - Rummler, Klaus ED - Bettinger, Patrick ED - Aßmann, Sandra ID - 43143 T2 - Jahrbuch Medienpädagogik 16. Medienpädagogik in Zeiten einer tiefgreifenden Mediatisierung TI - Die berufliche Tabletaneignung von Lehrkräften als Beispiel der Mediatisierung pädagogischer Handlungskontexte. Theoretische Perspektiven und empirische Befunde ER - TY - CHAP AU - Dehmel, Lukas ED - Bernhard-Skala,, Christian ED - Bolten-Bühler, Ricarda ED - Koller, Julia ED - Rohs, Matthias ED - Wahl, Johannes ID - 43142 T2 - Erwachsenenpädagogische Digitalisierungsforschung. Impulse - Befunde - Perspektiven. Bielefeld TI - Zur Entgrenzung der Arbeit des medienpädagogischen Weiterbildungspersonals im Kontext tiefgreifender Mediatisierung ER - TY - JOUR AU - Hälterlein, Jens ID - 43278 IS - 1 JF - Big Data & Society TI - Epistemologies of predictive policing: Mathematical social science, social physics and machine learning VL - 8 ER - TY - JOUR AB - Let E be an ordinary elliptic curve over a finite field and g be a positive integer. Under some technical assumptions, we give an algorithm to span the isomorphism classes of principally polarized abelian varieties in the isogeny class of E⁹ . The varieties are first described as hermitian lattices over (not necessarily maximal) quadratic orders and then geometrically in terms of their algebraic theta null point. We also show how to algebraically compute Siegel modular forms of even weight given as polynomials in the theta constants by a careful choice of an affine lift of the theta null point. We then use these results to give an algebraic computation of Serre’s obstruction for principally polarized abelian threefolds isogenous to E³ and of the Igusa modular form in dimension 4. We illustrate our algorithms with examples of curves with many rational points over finite fields. AU - Kirschmer, Markus AU - Narbonne, Fabien AU - Ritzenthaler, Christophe AU - Robert, Damien ID - 34912 IS - 333 JF - Mathematics of Computation KW - Applied Mathematics KW - Computational Mathematics KW - Algebra and Number Theory SN - 0025-5718 TI - Spanning the isogeny class of a power of an elliptic curve VL - 91 ER - TY - GEN AU - Schroeter-Wittke, Harald ID - 41088 SN - 0540–6226 T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes TI - Anette Baumann / Alexander Jendorff / Frank Theisen (Hgg.), Religion – Migration – Integration. Studien zu Wechselwirkungen religiös motivierter Mobilität im vormodernen Europa, Tübingen 2019 VL - 70 ER - TY - GEN AU - Schroeter-Wittke, Harald ID - 41090 SN - 0540–6226 T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes TI - Hendrik Meyer-Magister, Wehrdienst und Verweigerung als komplementäres Handeln. Individualisierungsprozesse im bundesdeutschen Protestantismus der 1950er Jahre (RBRD 7), Tübingen 2019 VL - 70 ER - TY - GEN AU - Schroeter-Wittke, Harald ID - 41091 SN - 0540–6226 T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes TI - Jutta Stander-Dulisch, Glaubenskrisen, Neue Religionen und der Papst. Religion in „Stern“ und Spiegel“ von 1960 bis 2014, Bielefeld 2019 VL - 70 ER - TY - JOUR AB - The relativistic wave equations determine the dynamics of quantum fields in the context of quantum field theory. One of the conventional tools for dealing with the relativistic bound state problem is the Klein-Fock-Gordon equation. In this work, using a developed scheme, we present how to surmount the centrifugal part and solve the modified Klein-Fock-Gordon equation for the linear combination of Hulthén and Yukawa potentials. In particular, we show that the relativistic energy eigenvalues and corresponding radial wave functions are obtained from supersymmetric quantum mechanics by applying the shape invariance concept. Here, both scalar potential conditions, which are whether equal and nonequal to vector potential, are considered in the calculation. The energy levels and corresponding normalized eigenfunctions are represented as a recursion relation regarding the Jacobi polynomials for arbitrary l states. Beyond that, a closed form of the normalization constant of the wave functions is found. Furthermore, we state that the energy eigenvalues are quite sensitive with potential parameters for the quantum states. The nonrelativistic and relativistic results obtained within SUSY QM overlap entirely with the results obtained by ordinary quantum mechanics, and it displays that the mathematical implementation of SUSY quantum mechanics is quite perfect. AU - Ahmadov, A. I. AU - Aslanova, S. M. AU - Orujova, M. Sh. AU - Badalov, S. V. ED - Vagnozzi, Sunny ID - 44042 JF - Advances in High Energy Physics KW - Nuclear and High Energy Physics SN - 1687-7365 TI - Analytical Bound State Solutions of the Klein-Fock-Gordon Equation for the Sum of Hulthén and Yukawa Potential within SUSY Quantum Mechanics VL - 2021 ER - TY - CONF AU - Meydani, Elnaz AU - Düsing, Christoph AU - Trier, Matthias ID - 44073 T2 - Innovation Through Information Systems: Volume II: A Collection of Latest Research on Technology Issues TI - Towards a Trust-Aware Item Recommendation System on a Graph Autoencoder with Attention Mechanism ER - TY - JOUR AU - Neufeld, Sergej AU - Bocchini, Adriana AU - Schmidt, Wolf Gero ID - 22310 JF - Physical Review Materials SN - 2475-9953 TI - Potassium titanyl phosphate Z- and Y-cut surfaces from density-functional theory ER - TY - JOUR AU - Plaickner, Julian AU - Speiser, Eugen AU - Braun, Christian AU - Schmidt, Wolf Gero AU - Esser, Norbert AU - Sanna, Simone ID - 22008 JF - Physical Review B SN - 2469-9950 TI - Surface localized phonon modes at the Si(553)-Au nanowire system ER -