@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}},
}

@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{48035,
  abstract     = {{BACKGROUND: Previous studies suggest better visual-spatial processing when participants are tested in postures in which dynamic stability is challenged. The question arises if this is also true for the performance in mental body-rotation tasks (MBRT).
AIM: Taking the embodied cognition approach into account, the first aim of the present study was to examine the potential influence of different demands on dynamic stability for two postures (parallel stand vs. tandem stand) on solving two versions of the MBRT, inducing either an object-based or an egocentric perspective transformation strategy. The second aim was to investigate if these different demands on dynamic stability are reflected in postural sway parameters.
METHOD: Thirty participants (18 females and 12 males) were tested in the two MBRTs and in a control condition. All tasks were performed while standing on a balance beam in tandem stand and in a feet parallel position on a force plate.
RESULTS: The results for response time and response error revealed effects of rotation angle and task, but no effect of posture. The analyzed Center of Pressure (CoP) data revealed a reduction of body sway during the MBRT for egocentric perspective transformations.
CONCLUSION: The results indicate that participants performed better for egocentric than for object-based transformations and that the egocentric transformation leads to more postural stability than the object-based.}},
  author       = {{Budde, Kirsten and Jöllenbeck, Thomas and Barela, José A. and Figueiredo, Gabriella A. and Weigelt, Matthias}},
  issn         = {{2446-4902}},
  journal      = {{Brazilian Journal of Motor Behavior}},
  number       = {{3}},
  pages        = {{180--194}},
  publisher    = {{Brazilian Journal for Motor Behavior}},
  title        = {{{Mental body rotation with egocentric and object-based transformations in different postures: standing vs. balancing}}},
  doi          = {{10.20338/bjmb.v15i3.250}},
  volume       = {{15}},
  year         = {{2021}},
}

@inproceedings{48037,
  author       = {{Budde, Kirsten and Barela, José A and Figueiredo, Gabriella A and Weigelt, Matthias}},
  booktitle    = {{TeaP 2021 - Abstracts of the 63rd Conference of Experimental Psychologists.}},
  editor       = {{Huckauf, Anke and Baumann, Martin and Ernst, Marc and Herbert, Cornelia and Kiefer, Markus and Sauter, Marian}},
  location     = {{Ulm}},
  pages        = {{50}},
  title        = {{{Mental body rotation with egocentric and object-based transformations in different postures: sitting vs. standing.}}},
  doi          = {{10.23668/PSYCHARCHIVES.5178}},
  year         = {{2021}},
}

@inproceedings{48286,
  author       = {{Habernal, Ivan}},
  booktitle    = {{Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing}},
  publisher    = {{Association for Computational Linguistics}},
  title        = {{{When differential privacy meets NLP: The devil is in the detail}}},
  doi          = {{10.18653/v1/2021.emnlp-main.114}},
  year         = {{2021}},
}

@inproceedings{29893,
  abstract     = {{Phase-shift modulated full bridge converters suffer from thermal imbalances of the inverter switches. The lagging leg switches are subject to larger commutation currents compared to those of the leading leg as the transformer current reduces in the freewheeling interval. Furthermore, after this interval, the energy in the series inductance may not be large enough to achieve zero-voltage switching (ZVS) for the leading leg. Both effects result in thermal imbalances. This paper analyzes the alternating-asymmetrical phase-shift modulation to achieve balanced conduction and switching losses for all four switches while showing that this modulation is easily implemented on standard DSPs. The modulation has been implemented to LLC converters where experimental measurement results proved its effectiveness for LLC converters by reducing the temperature deviation from 6.3 K to only 0.2 K such that the peak temperature is reduced from 95 °C to 92 °C. The paper also proves that the modulation can be utilized to improve the efficiency of LLC converters operated at very low gains while simultaneously reducing the junction temperature of all four switches compared to the conventional complementary modulation. Finally, EMI implications are analyzed, which show that the modulation may be beneficial for reducing the common-mode emissions around the operating frequency.}},
  author       = {{Rehlaender, Philipp and Unruh, Roland and Schafmeister, Frank and Böcker, Joachim}},
  booktitle    = {{2021 IEEE Applied Power Electronics Conference and Exposition (APEC)}},
  isbn         = {{978-1-7281-8950-5}},
  keywords     = {{Phase-Shifted Full Bridge, Full-Bridge Converter, Phase-Shift Control, Phase-Shift Modulation, LLC Converter, Thermal Balancing}},
  location     = {{Phoenix, AZ, USA}},
  publisher    = {{IEEE}},
  title        = {{{Alternating Asymmetrical Phase-Shift Modulation for Full-Bridge Converters with Balanced Switching Losses to Reduce Thermal Imbalances}}},
  doi          = {{10.1109/apec42165.2021.9487104}},
  year         = {{2021}},
}

@article{34827,
  abstract     = {{<jats:title>Zusammenfassung</jats:title><jats:p>Zu den ersten geometrischen Begriffen, die Kinder bereits im Elementar- und Primarbereich lernen, zählen u. a. Viereck, Rechteck und Quadrat. Studien zeigen, dass Lernende bereits früh individuelle Vorstellungen, sog. <jats:italic>individuelle Begriffskonzepte,</jats:italic> zu diesen Begriffen aufbauen. Zwar wird die Entwicklung von Begriffsverständnis in verschiedenen mathematikdidaktischen Stufenmodellen dargestellt, diese sind jedoch generisch und beschreiben nicht explizit die Entwicklung der ersten <jats:italic>individuellen Begriffskonzepte </jats:italic>von Lernenden zu Viereck, Rechteck und Quadrat. Aus empirischer Sicht liegen verschiedene Studien vor, die einzelne Aspekte der individuellen Begriffskonzepte von Lernenden unterschiedlicher Altersgruppen zu diesen Begriffen ausleuchten. Um Begriffsbildungsprozesse aus empirischer Sicht detaillierter entlang der jeweils vorherrschenden individuellen Begriffskonzepte zu beschreiben, fehlen insbesondere Studien in der Grundschule, die alle vier Klassenstufen betrachten und dabei differenzierte Erkenntnisse zu verschiedenen theoretischen Indikatoren des Begriffsverständnisses liefern. Daher geht die vorliegende Studie der Frage nach, welches Verständnis der Begriffe Viereck, Rechteck und Quadrat Schülerinnen und Schüler der Jahrgangsstufen 1, 2, 3 und 4 zeigen. Dazu wurde eine Quasi-Längsschnittstudie mit <jats:italic>N</jats:italic> = 456 Grundschulkindern (ca. 100 pro Jahrgangsstufe) durchgeführt. Die Ergebnisse geben detaillierte Einblicke in die individuellen Begriffskonzepte der Lernenden und zeigen, dass Lernende zunehmend Eigenschaften der Figuren berücksichtigen, jedoch individuelle Begriffskonzepte über lange Zeit auch prototypisch geprägt sind. Implikationen dieser Ergebnisse für Forschung und Praxis werden diskutiert.</jats:p>}},
  author       = {{Bruns, Julia and Unterhauser, Elisabeth and Gasteiger, Hedwig}},
  issn         = {{0173-5322}},
  journal      = {{Journal für Mathematik-Didaktik}},
  keywords     = {{Education, General Mathematics}},
  number       = {{2}},
  pages        = {{581--623}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Geometrisches Begriffsverständnis in der Grundschule am Beispiel der Begriffe Viereck, Rechteck und Quadrat}}},
  doi          = {{10.1007/s13138-021-00185-4}},
  volume       = {{42}},
  year         = {{2021}},
}

@inbook{48461,
  author       = {{Jacke, Christoph}},
  booktitle    = {{Musik als Lebensmittel. Kulturwissenschaftlich-theologische Rationen für ein Jahr.}},
  editor       = {{Keuchen, Marion and Janus, Richard}},
  pages        = {{101--113}},
  publisher    = {{LIT}},
  title        = {{{Tocotronic - Hoffnung (2020).}}},
  year         = {{2021}},
}

@inbook{43412,
  author       = {{Limpinsel, Inga and Engemann, Mario and Neuberger, Olga and Serova, Katja and Aßmann, Sandra}},
  booktitle    = {{Kooperation - Koordination - Kollegialität. Befunde und Diskurse zum (multi-)professionellen Zusammenwirken pädagogischer Akteur*innen an Schulen}},
  editor       = {{Kunze, Katharina and Petersen, Dorthe and Bellenberg, Gabriele and Fabel-Lamla, Melanie and Hinzke, Jan-Hendrik and Moldenhauer, Anna and Peukert, Lena and Reintjes, Christian and te Poel, Kathrin}},
  pages        = {{227--246}},
  publisher    = {{Verlag Julius Klinkhardt}},
  title        = {{{Schule und außerschulische Bildungspartner an der Schnittstelle von formalen und non-formalen Bildungsprozessen - Empirische Befunde zur Kooperation und professionellen Handlungskompetenz}}},
  year         = {{2021}},
}

@inbook{43414,
  author       = {{Engemann, Mario and Herzig, Bardo}},
  booktitle    = {{Fachliche Bildung und digitale Transformation - Fachdidaktische Forschung und Diskurse. Fachtagung der Gesellschaft für Fachdidaktik 2020}},
  editor       = {{Maurer, Christian and Rincke, Karsten and Hemmer, Michael}},
  pages        = {{185--188}},
  publisher    = {{Universität Regensburg}},
  title        = {{{Lehrerkooperation und Digitalisierung - Gestaltung digital-kooperativer Arbeitsbeziehungen von Lehrkräften und ReferendarInnen am Beispiel des Schulfachs Pädagogik}}},
  year         = {{2021}},
}

@article{45382,
  author       = {{Prediger, Susanne and Dröse, Jennifer}},
  journal      = {{Lernen und Lernstörungen, 10(2)}},
  title        = {{{Fehlerbearbeitung bei mathematischen Textaufgaben – Sprachliche und strategische Fehlerursachen und ihre Bearbeitung}}},
  doi          = {{doi.org/10.1024/2235-0977/a000330}},
  year         = {{2021}},
}

@article{28684,
  author       = {{Bloh, Bea and Wehde, Janis}},
  journal      = {{Lernende Schule}},
  number       = {{96}},
  pages        = {{27--30}},
  title        = {{{Salutogenes Leitungshandeln. Ein Ansatz zur Gesundheitsförderung und Qualitätsentwicklung in der Schule.}}},
  year         = {{2021}},
}

@inbook{48810,
  author       = {{Luft, Sebastian}},
  booktitle    = {{Simmel-Handbuch}},
  editor       = {{Hartung, G}},
  pages        = {{247--256}},
  publisher    = {{Metzler}},
  title        = {{{Simmels Abhandlungen zu Kant}}},
  year         = {{2021}},
}

@book{48906,
  editor       = {{Luft, Sebastian and Ferrari, Massimo}},
  issn         = {{2626-8329}},
  keywords     = {{General Medicine}},
  publisher    = {{Walter de Gruyter GmbH}},
  title        = {{{Cassirer’s Children, Special Topics Issue}}},
  doi          = {{10.1515/jtph-2021-0010}},
  volume       = {{2(1)}},
  year         = {{2021}},
}

@book{48907,
  editor       = {{Luft, Sebastian and Bohr, Jörn}},
  pages        = {{598}},
  publisher    = {{Felix Meiner Verlag}},
  title        = {{{ Wilhelm Windelband. Präludien}}},
  year         = {{2021}},
}