@inbook{24375, author = {{Wach, Bernhard and Krebs, Benjamin and Kabst, Rüdiger}}, booktitle = {{HR-Trends 2021}}, editor = {{Schwuchow, K. and Gutmann, J.}}, publisher = {{Haufe-Lexware}}, title = {{{HR-Manager als Intrapreneure}}}, year = {{2021}}, } @inproceedings{29304, abstract = {{In this work we address disentanglement of style and content in speech signals. We propose a fully convolutional variational autoencoder employing two encoders: a content encoder and a style encoder. To foster disentanglement, we propose adversarial contrastive predictive coding. This new disentanglement method does neither need parallel data nor any supervision. We show that the proposed technique is capable of separating speaker and content traits into the two different representations and show competitive speaker-content disentanglement performance compared to other unsupervised approaches. We further demonstrate an increased robustness of the content representation against a train-test mismatch compared to spectral features, when used for phone recognition.}}, author = {{Ebbers, Janek and Kuhlmann, Michael and Cord-Landwehr, Tobias and Haeb-Umbach, Reinhold}}, booktitle = {{Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}}, pages = {{3860–3864}}, title = {{{Contrastive Predictive Coding Supported Factorized Variational Autoencoder for Unsupervised Learning of Disentangled Speech Representations}}}, year = {{2021}}, } @inbook{36315, author = {{Neumann, Anna}}, booktitle = {{Musik als Lebensmittel. Kulturwissenschaftlich-theologische Rationen für ein Jahr}}, editor = {{Keuchen, Marion and Janus, Richard}}, pages = {{216--221}}, title = {{{Happy clappy heile Welt? Wie angesichts von Krisen und Katastrophen eine schöne Welt besungen werden kann}}}, year = {{2021}}, } @inbook{36319, author = {{Neumann, Anna and Katharina, Kammeyer and Vera, Uppenkamp}}, booktitle = {{Musk als Lebensmittel}}, editor = {{Keuchen, Marion and Janus, Richard}}, pages = {{139--147}}, title = {{{This is my Fight Song}}}, year = {{2021}}, } @inbook{49182, author = {{Gretz, Daniela}}, booktitle = {{Miszellanes Lesen. Interferenzen zwischen medialen Formaten, Romanstrukturen und Lektürepraktiken im 19. Jahrhundert}}, editor = {{Gretz, Daniela and Krause, Marcus and Pethes, Nicolas}}, pages = {{343−359}}, publisher = {{Wehrhahn}}, title = {{{Keller, Raabe, Fontane: ›nichts für den Durchschnittsleser‹. Miszellane Lektüren, ›imaginäre Leser‹ und Kanonisierungsprozesse in der Literaturkritik der zeitgenössischen Presse}}}, year = {{2021}}, } @book{49178, editor = {{Gretz, Daniela and Krause, Marcus and Pethes, Nicolas}}, publisher = {{Werhhahn}}, title = {{{Miszellanes Lesen. Interferenzen zwischen medialen Formaten, Romanstrukturen und Lektürepraktiken im 19. Jahrhundert}}}, year = {{2021}}, } @article{31578, author = {{Häsel-Weide, Uta and Seitz, Simone and Wallner, Melina and Wilke, Yannik and Heckmann, Lara}}, journal = {{QfI - Qualifizierung für Inklusion. Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte}}, number = {{1}}, title = {{{Mit Aufgaben im inklusiven Mathematikunterricht professionell umgehen - Erkenntnisse einer Interviewstudie mit Lehrpersonen der Sekundarstufe}}}, doi = {{10.21248/qfi.57}}, volume = {{3}}, year = {{2021}}, } @inproceedings{31583, author = {{Hattermann, Mathias and Häsel-Weide, Uta and Wallner, Melina}}, booktitle = {{Proceedings of the 44th Conference of the International Group for the Psychology of Mathematics Education }}, editor = {{Inprasitha, M. and Changsri, N. and Boonsena, N.}}, pages = {{9--15}}, title = {{{Conceptualiziation processes of 6th graders for rotational symmetry}}}, volume = {{3}}, year = {{2021}}, } @inproceedings{22894, abstract = {{The first order optimality conditions of optimal control problems (OCPs) can be regarded as boundary value problems for Hamiltonian systems. Variational or symplectic discretisation methods are classically known for their excellent long term behaviour. As boundary value problems are posed on intervals of fixed, moderate length, it is not immediately clear whether methods can profit from structure preservation in this context. When parameters are present, solutions can undergo bifurcations, for instance, two solutions can merge and annihilate one another as parameters are varied. We will show that generic bifurcations of an OCP are preserved under discretisation when the OCP is either directly discretised to a discrete OCP (direct method) or translated into a Hamiltonian boundary value problem using first order necessary conditions of optimality which is then solved using a symplectic integrator (indirect method). Moreover, certain bifurcations break when a non-symplectic scheme is used. The general phenomenon is illustrated on the example of a cut locus of an ellipsoid.}}, author = {{Offen, Christian and Ober-Blöbaum, Sina}}, issn = {{2405-8963}}, keywords = {{optimal control, catastrophe theory, bifurcations, variational methods, symplectic integrators}}, location = {{Berlin, Germany}}, pages = {{334--339}}, title = {{{Bifurcation preserving discretisations of optimal control problems}}}, doi = {{https://doi.org/10.1016/j.ifacol.2021.11.099}}, volume = {{54(19)}}, year = {{2021}}, } @inproceedings{21572, author = {{Ridderbusch, Steffen and Offen, Christian and Ober-Blöbaum, Sina and Goulart, Paul}}, booktitle = {{2021 60th IEEE Conference on Decision and Control (CDC)}}, location = {{Austin, TX, USA}}, pages = {{2896}}, publisher = {{IEEE}}, title = {{{Learning ODE Models with Qualitative Structure Using Gaussian Processes }}}, doi = {{10.1109/CDC45484.2021.9683426}}, year = {{2021}}, } @inproceedings{21592, abstract = {{We propose a reachability approach for infinite and finite horizon multi-objective optimization problems for low-thrust spacecraft trajectory design. The main advantage of the proposed method is that the Pareto front can be efficiently constructed from the zero level set of the solution to a Hamilton-Jacobi-Bellman equation. We demonstrate the proposed method by applying it to a low-thrust spacecraft trajectory design problem. By deriving the analytic expression for the Hamiltonian and the optimal control policy, we are able to efficiently compute the backward reachable set and reconstruct the optimal trajectories. Furthermore, we show that any reconstructed trajectory will be guaranteed to be weakly Pareto optimal. The proposed method can be used as a benchmark for future research of applying reachability analysis to low-thrust spacecraft trajectory design.}}, author = {{Vertovec, Nikolaus and Ober-Blöbaum, Sina and Margellos, Kostas}}, location = {{Rotterdam, the Netherlands}}, pages = {{1975--1980}}, title = {{{Multi-objective minimum time optimal control for low-thrust trajectory design}}}, year = {{2021}}, } @inproceedings{29868, author = {{Jiménez, F. and Ober-Blöbaum, Sina}}, booktitle = {{Nichtlineare Sci 31}}, title = {{{Fractional Damping Through Restricted Calculus of Variations}}}, volume = {{46}}, year = {{2021}}, } @inbook{29838, author = {{Hartung, Olaf and Krebs, Alexandra and Fastlabend-Vargas, Daniel and Meyer-Hamme, Johannes}}, booktitle = {{Theorie und Praxis in der Lehrerbildung.Verhältnisbestimmungen aus der Perspektive von Fachdidaktiken}}, editor = {{Caruso, Carina and Harteis, Christian and Gröschner, Alexander}}, isbn = {{9783658325671 }}, pages = {{63--81}}, publisher = {{Springer VS}}, title = {{{Der steinige Weg vom Wissen zum Können: Zum schwierigen Ver­hältnis von Theorie und Praxis bei der Betreuung zukünftiger Geschichtslehrkräfte in Langzeitpraktika}}}, year = {{2021}}, } @article{49337, author = {{Breuer, Saskia Rebecca}}, journal = {{Der Dom. Katholisches Magazin im Erzbistum Paderborn}}, title = {{{„Da öffnet er ihnen das Verständnis, sodass sie die Schriften verstanden“ (Lk 24,45)}}}, volume = {{47}}, year = {{2021}}, } @inbook{47662, author = {{Miggelbrink, Monique and Bartz, Christina}}, booktitle = {{Selbstbehältnisse. Orte und Gegenstände der Aufbewahrung von Subjektivität}}, editor = {{Busse, Laura and Gehrlach, Andreas and Waldemar, Isak}}, pages = {{113--125}}, publisher = {{Neofelis}}, title = {{{Home-Office. Kulturelle Formationen häuslicher Arbeit}}}, year = {{2021}}, } @inproceedings{21272, author = {{Ködding, Patrick and Dumitrescu, Roman}}, booktitle = {{Digitalisisierung souverän gestalten}}, editor = {{Hartmann, Ernst A.}}, pages = {{pp. 59--73}}, publisher = {{Springer Vieweg}}, title = {{{Forschungsfelder für Künstliche Intelligenz in der strategischen Produktplanung}}}, year = {{2021}}, } @article{23843, author = {{Meier, F. and Protte, M. and Baron, E. and Feneberg, M. and Goldhahn, R. and Reuter, Dirk and As, Donat Josef}}, issn = {{2158-3226}}, journal = {{AIP Advances}}, title = {{{Selective area growth of cubic gallium nitride on silicon (001) and 3C-silicon carbide (001)}}}, doi = {{10.1063/5.0053865}}, year = {{2021}}, } @article{47963, abstract = {{Nonlinear and quantum optical devices based on periodically-poled thin film lithium niobate (PP-TFLN) have gained considerable interest lately, due to their significantly improved performance as compared to their bulk counterparts. Nevertheless, performance parameters such as conversion efficiency, minimum pump power, and spectral bandwidth strongly depend on the quality of the domain structure in these PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap and penetration depth of domains with the waveguide mode. Hence, in order to propose improved fabrication protocols, a profound quality control of domain structures is needed that allows quantifying and thoroughly analyzing these parameters. In this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation (SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample properties through cross-correlating these methods. Based on our findings, we designate SHG to be the best-suited standard imaging technique for this purpose, in particular when investigating the domain poling process in x-cut TFLNs. While PFM is excellently recommended for near-surface high-resolution imaging, RS provides thorough insights into stress and/or defect distributions, as associated with these domain structures. In this context, our work here indicates unexpectedly large signs for internal fields occurring in x-cut PP-TFLNs that are substantially larger as compared to previous observations in bulk LN.}}, author = {{Reitzig, Sven and Rüsing, Michael and Zhao, Jie and Kirbus, Benjamin and Mookherjea, Shayan and Eng, Lukas M.}}, issn = {{2073-4352}}, journal = {{Crystals}}, keywords = {{Inorganic Chemistry, Condensed Matter Physics, General Materials Science, General Chemical Engineering}}, number = {{3}}, publisher = {{MDPI AG}}, title = {{{“Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films}}}, doi = {{10.3390/cryst11030288}}, volume = {{11}}, year = {{2021}}, } @article{47964, abstract = {{In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.}}, author = {{Beyreuther, Elke and Ratzenberger, Julius and Roeper, Matthias and Kirbus, Benjamin and Rüsing, Michael and Ivleva, Liudmila I. and Eng, Lukas M.}}, issn = {{2073-4352}}, journal = {{Crystals}}, keywords = {{Inorganic Chemistry, Condensed Matter Physics, General Materials Science, General Chemical Engineering}}, number = {{7}}, publisher = {{MDPI AG}}, title = {{{Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals}}}, doi = {{10.3390/cryst11070780}}, volume = {{11}}, year = {{2021}}, } @article{47965, abstract = {{Exceptionally electron-rich, nearly trigonal-planar tricyanidometalate anions [Fe(CN)3]7− and [Ru(CN)3]7− were stabilized in LiSr3[Fe(CN)3] and AE3.5[M(CN)3] (AE=Sr, Ba; M=Fe, Ru). They are the first examples of group 8 elements with the oxidation state of −IV. Microcrystalline powders were obtained by a solid-state route, single crystals from alkali metal flux. While LiSr3[Fe(CN)3] crystallizes in P63/m, the polar space group P63 with three-fold cell volume for AE3.5[M(CN)3] is confirmed by second harmonic generation. X-ray diffraction, IR and Raman spectroscopy reveal longer C−N distances (124–128 pm) and much lower stretching frequencies (1484–1634 cm−1) than in classical cyanidometalates. Weak C−N bonds in combination with strong M−C π-bonding is a scheme also known for carbonylmetalates. Instead of the formal notation [Fe−IV(CN−)3]7−, quantum chemical calculations reveal non-innocent intermediate-valent CN1.67− ligands and a closed-shell d10 configuration for Fe, that is, Fe2−.}}, author = {{Jach, Franziska and Wagner, Frank R. and Amber, Zeeshan H. and Rüsing, Michael and Hunger, Jens and Prots, Yurii and Kaiser, Martin and Bobnar, Matej and Jesche, Anton and Eng, Lukas M. and Ruck, Michael and Höhn, Peter}}, issn = {{1433-7851}}, journal = {{Angewandte Chemie International Edition}}, keywords = {{General Chemistry, Catalysis}}, number = {{29}}, pages = {{15879--15885}}, publisher = {{Wiley}}, title = {{{Tricyanidoferrates(−IV) and Ruthenates(−IV) with Non‐Innocent Cyanido Ligands}}}, doi = {{10.1002/anie.202103268}}, volume = {{60}}, year = {{2021}}, }