@article{51374, author = {{Hasler, David and Hinrichs, Benjamin and Siebert, Oliver}}, issn = {{0022-1236}}, journal = {{Journal of Functional Analysis}}, keywords = {{Analysis}}, number = {{7}}, publisher = {{Elsevier BV}}, title = {{{Non-Fock ground states in the translation-invariant Nelson model revisited non-perturbatively}}}, doi = {{10.1016/j.jfa.2024.110319}}, volume = {{286}}, year = {{2024}}, } @article{52758, author = {{Harder, Hans and Peitz, Sebastian}}, title = {{{On the continuity and smoothness of the value function in reinforcement learning and optimal control}}}, year = {{2024}}, } @unpublished{52342, abstract = {{We introduce the concept of a k-token signed graph and study some of its combinatorial and algebraic properties. We prove that two switching isomorphic signed graphs have switching isomorphic token graphs. Moreover, we show that the Laplacian spectrum of a balanced signed graph is contained in the Laplacian spectra of its k-token signed graph. Besides, we introduce and study the unbalance level of a signed graph, which is a new parameter that measures how far a signed graph is from being balanced. Moreover, we study the relation between the frustration index and the unbalance level of signed graphs and their token signed graphs. }}, author = {{Dalfó, C. and Fiol, M. A. and Steffen, Eckhard}}, booktitle = {{arXiv:2403.02924}}, title = {{{On token signed graphs}}}, year = {{2024}}, } @article{50409, abstract = {{AbstractBackgroundReal‐world problems are important in math instruction, but they do not necessarily trigger students' task motivation. Personalizing real‐world problems by (1) matching problems to students' shared living environment (context personalization) and (2) asking students to pose their own problems (active personalization) might be two interventions to increase students' task motivation.AimIn the current study, we investigated the effects of context personalization and active personalization on students' self‐efficacy expectations, intrinsic value, attainment value, utility value, and cost.SampleThe participants were 28 fifth‐ and sixth‐grade students who voluntarily took part in a six‐month afterschool program in which they posed problems with the aim of creating a math walk in their hometown.MethodUsing a within‐subjects design, at the end of the afterschool program, the students rated their self‐efficacy expectations and task values for four self‐developed problems associated with their hometown, four peer‐developed problems associated with their hometown, and four instructor‐provided problems associated with unfamiliar locations.ResultsStudents reported higher self‐efficacy expectations, intrinsic value, attainment value, and utility value for active‐personalized than non‐personalized problems. To a lesser extent, context personalization promoted intrinsic value and attainment value. No effect was found for cost.ConclusionsActive personalization (i.e. asking students to pose their own real‐world problems) is suited to enhance students' task motivation, specifically their self‐efficacy expectations, intrinsic value, attainment value, and utility value. Context personalization still boosts students' intrinsic value and attainment value. Implementation in classroom instruction is discussed.}}, author = {{Schoenherr, Johanna}}, issn = {{0007-0998}}, journal = {{British Journal of Educational Psychology}}, keywords = {{Developmental and Educational Psychology, Education}}, publisher = {{Wiley}}, title = {{{Personalizing real‐world problems: Posing own problems increases self‐efficacy expectations, intrinsic value, attainment value, and utility value}}}, doi = {{10.1111/bjep.12653}}, year = {{2024}}, } @inbook{51130, author = {{Eickelmann, Birgit and Barbovschi, M. and Holmarsdottir, H.B. and Parsanoglou, D. and Sisask, M. and Labusch, Amelie}}, booktitle = {{Understanding the everyday digital lives of children and young people}}, editor = {{Holmarsdottir, H.B. and Seland, I. and Hyggen, C. and Roth, M.}}, publisher = {{Palgrave Macmillan}}, title = {{{Perspectives of children and young people on their education as preparing for their future in the digital age: In-depth qualitative study in five European countries.}}}, doi = {{10.1007/978-3-031-46929-9}}, year = {{2024}}, } @misc{50815, author = {{Schulz, Maurice}}, title = {{{Phosphorhaltige Lasersinter-Materialien mit Flammschutzwirkung: Optimierung und Analyse der Recyclingfähigkeit (Studienarbeit)}}}, year = {{2024}}, } @article{51104, author = {{Liang, Qian and Ma, Xuekai and Gu, Chunling and Ren, Jiahuan and An, Cunbin and Fu, Hongbing and Schumacher, Stefan and Liao, Qing}}, journal = {{Journal of the American Chemical Society (JACS)}}, title = {{{Photochemical Reaction Enabling the Engineering of Photonic Spin−Orbit Coupling in Organic-Crystal Optical Microcavities}}}, doi = {{10.1021/jacs.3c11373}}, year = {{2024}}, } @inbook{50982, author = {{Eke, Norbert}}, booktitle = {{andererseits. Yearbook of Transatlantic German Studies 11/12 (2022/23)}}, editor = {{Donahue, William Collins and Mein, Georg and Parr, Rolf}}, pages = {{349--362}}, publisher = {{transcript Verlag}}, title = {{{Poetologien mehrdeutigen Erinnerns in der deutschsprachigen Gegenwartsliteratur.}}}, year = {{2024}}, } @book{52725, editor = {{Becher, Andrea}}, publisher = {{Klinkhardt}}, title = {{{Politische Bildung im Sachunterricht. Potenziale - Positionen - Perspektiven}}}, year = {{2024}}, } @unpublished{51204, abstract = {{Given a real semisimple connected Lie group $G$ and a discrete torsion-free subgroup $\Gamma < G$ we prove a precise connection between growth rates of the group $\Gamma$, polyhedral bounds on the joint spectrum of the ring of invariant differential operators, and the decay of matrix coefficients. In particular, this allows us to completely characterize temperedness of $L^2(\Gamma\backslash G)$ in this general setting.}}, author = {{Lutsko, Christopher and Weich, Tobias and Wolf, Lasse Lennart}}, booktitle = {{arXiv:2402.02530}}, title = {{{Polyhedral bounds on the joint spectrum and temperedness of locally symmetric spaces}}}, year = {{2024}}, } @inbook{51258, author = {{Schroeter-Wittke, Harald and Jacke, Christoph}}, booktitle = {{(Un)verfügbar - Kulturen des Heiligen}}, editor = {{Egidi, Margreth and Peters, Ludmila and Schmidt, Jochen}}, isbn = {{978-3-8376-6611-3}}, pages = {{273--300}}, publisher = {{Bielefeld University Press}}, title = {{{Pop-Ikonen. Transformationen des Heiligen in der deutschen Pop(musik)kultur}}}, year = {{2024}}, } @inbook{49561, author = {{Jacke, Christoph and Schroeter-Wittke, Harald}}, booktitle = {{(Un)verfügbar. Kulturen des Heiligen.}}, editor = {{Edigi, Margreth and Peters, Ludmila and Schmidt, Jochen}}, pages = {{273--300}}, publisher = {{Transcript}}, title = {{{Pop-Ikonen. Transformationen des Heiligen in der deutschen Pop(musik)kultur.}}}, year = {{2024}}, } @article{52686, author = {{Ahmed, Qazi Arbab and Wiersema, Tobias and Platzner, Marco}}, issn = {{2509-3428}}, journal = {{Journal of Hardware and Systems Security}}, keywords = {{General Engineering, Energy Engineering and Power Technology}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Post-configuration Activation of Hardware Trojans in FPGAs}}}, doi = {{10.1007/s41635-024-00147-5}}, year = {{2024}}, } @article{50649, author = {{zur Heiden, Philipp and Priefer, Jennifer and Beverungen, Daniel}}, issn = {{0018-9391}}, journal = {{IEEE Transactions on Engineering Management}}, keywords = {{Electrical and Electronic Engineering, Strategy and Management}}, pages = {{1--16}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Predictive Maintenance on the Energy Distribution Grid—Design and Evaluation of a Digital Industrial Platform in the Context of a Smart Service System}}}, doi = {{10.1109/tem.2024.3352819}}, year = {{2024}}, } @inbook{48552, author = {{Fuchs, Christian}}, booktitle = {{Yuqi Na: The Chinese Internet. Political Economy and Digital Discourse}}, pages = {{xv--xix}}, publisher = {{Routledge}}, title = {{{Preface}}}, year = {{2024}}, } @inbook{52505, author = {{Gövert, Andre and Niederhaus, Constanze and Blumberg, Eva}}, booktitle = {{Mehrsprachigkeit in der Schule – Sprachbildung im und durch Sachunterricht}}, pages = {{295--309}}, publisher = {{Kohlhammer}}, title = {{{Professionalisierung für Sprachbildung aus Sicht von Sachunterrichtsstudierenden – Langzeitwirkungen eines Vertiefungsseminars in der ersten Phase der sachunterrichtsdidaktischen Lehrer* innenbildung.}}}, year = {{2024}}, } @article{51356, abstract = {{Abstract Lithium niobate has emerged as a promising platform for integrated quantum optics, enabling efficient generation, manipulation, and detection of quantum states of light. However, integrating single-photon detectors requires cryogenic operating temperatures, since the best performing detectors are based on narrow superconducting wires. While previous studies have demonstrated the operation of quantum light sources and electro-optic modulators in LiNbO3 at cryogenic temperatures, the thermal transition between room temperature and cryogenic conditions introduces additional effects that can significantly influence device performance. In this paper, we investigate the generation of pyroelectric charges and their impact on the optical properties of lithium niobate waveguides when changing from room temperature to 25 K, and vice versa. We measure the generated pyroelectric charge flow and correlate this with fast changes in the birefringence acquired through the Sénarmont-method. Both electrical and optical influence of the pyroelectric effect occur predominantly at temperatures above 100 K.}}, author = {{Thiele, Frederik and Hummel, Thomas and Lange, Nina Amelie and Dreher, Felix and Protte, Maximilian and Bruch, Felix vom and Lengeling, Sebastian and Herrmann, Harald and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}}, issn = {{2633-4356}}, journal = {{Materials for Quantum Technology}}, keywords = {{General Earth and Planetary Sciences, General Environmental Science}}, number = {{1}}, publisher = {{IOP Publishing}}, title = {{{Pyroelectric influence on lithium niobate during the thermal transition for cryogenic integrated photonics}}}, doi = {{10.1088/2633-4356/ad207d}}, volume = {{4}}, year = {{2024}}, } @book{51132, author = {{Seitz, Simone and Hamacher, Catalina and Schieffer, Leonie and Bunte, Charline}}, isbn = {{978-3-95414-206-4}}, publisher = {{Debus Pädagogik}}, title = {{{Qualitätsoffensive Ganztag - Praktische Methoden für den Weg zur guten Ganztagsbildung}}}, year = {{2024}}, } @unpublished{50272, abstract = {{Despite the fundamental role the Quantum Satisfiability (QSAT) problem has played in quantum complexity theory, a central question remains open: At which local dimension does the complexity of QSAT transition from "easy" to "hard"? Here, we study QSAT with each constraint acting on a $k$-dimensional and $l$-dimensional qudit pair, denoted $(k,l)$-QSAT. Our first main result shows that, surprisingly, QSAT on qubits can remain $\mathsf{QMA}_1$-hard, in that $(2,5)$-QSAT is $\mathsf{QMA}_1$-complete. In contrast, $2$-SAT on qubits is well-known to be poly-time solvable [Bravyi, 2006]. Our second main result proves that $(3,d)$-QSAT on the 1D line with $d\in O(1)$ is also $\mathsf{QMA}_1$-hard. Finally, we initiate the study of 1D $(2,d)$-QSAT by giving a frustration-free 1D Hamiltonian with a unique, entangled ground state. Our first result uses a direct embedding, combining a novel clock construction with the 2D circuit-to-Hamiltonian construction of [Gosset, Nagaj, 2013]. Of note is a new simplified and analytic proof for the latter (as opposed to a partially numeric proof in [GN13]). This exploits Unitary Labelled Graphs [Bausch, Cubitt, Ozols, 2017] together with a new "Nullspace Connection Lemma", allowing us to break low energy analyses into small patches of projectors, and to improve the soundness analysis of [GN13] from $\Omega(1/T^6)$ to $\Omega(1/T^2)$, for $T$ the number of gates. Our second result goes via black-box reduction: Given an arbitrary 1D Hamiltonian $H$ on $d'$-dimensional qudits, we show how to embed it into an effective null-space of a 1D $(3,d)$-QSAT instance, for $d\in O(1)$. Our approach may be viewed as a weaker notion of "simulation" (\`a la [Bravyi, Hastings 2017], [Cubitt, Montanaro, Piddock 2018]). As far as we are aware, this gives the first "black-box simulation"-based $\mathsf{QMA}_1$-hardness result, i.e. for frustration-free Hamiltonians.}}, author = {{Rudolph, Dorian and Gharibian, Sevag and Nagaj, Daniel}}, booktitle = {{arXiv:2401.02368}}, title = {{{Quantum 2-SAT on low dimensional systems is $\mathsf{QMA}_1$-complete: Direct embeddings and black-box simulation}}}, year = {{2024}}, } @unpublished{50273, abstract = {{The Polynomial-Time Hierarchy ($\mathsf{PH}$) is a staple of classical complexity theory, with applications spanning randomized computation to circuit lower bounds to ''quantum advantage'' analyses for near-term quantum computers. Quantumly, however, despite the fact that at least \emph{four} definitions of quantum $\mathsf{PH}$ exist, it has been challenging to prove analogues for these of even basic facts from $\mathsf{PH}$. This work studies three quantum-verifier based generalizations of $\mathsf{PH}$, two of which are from [Gharibian, Santha, Sikora, Sundaram, Yirka, 2022] and use classical strings ($\mathsf{QCPH}$) and quantum mixed states ($\mathsf{QPH}$) as proofs, and one of which is new to this work, utilizing quantum pure states ($\mathsf{pureQPH}$) as proofs. We first resolve several open problems from [GSSSY22], including a collapse theorem and a Karp-Lipton theorem for $\mathsf{QCPH}$. Then, for our new class $\mathsf{pureQPH}$, we show one-sided error reduction for $\mathsf{pureQPH}$, as well as the first bounds relating these quantum variants of $\mathsf{PH}$, namely $\mathsf{QCPH}\subseteq \mathsf{pureQPH} \subseteq \mathsf{EXP}^{\mathsf{PP}}$.}}, author = {{Agarwal, Avantika and Gharibian, Sevag and Koppula, Venkata and Rudolph, Dorian}}, booktitle = {{arXiv:2401.01633}}, title = {{{Quantum Polynomial Hierarchies: Karp-Lipton, error reduction, and lower bounds}}}, year = {{2024}}, }