@article{34256,
abstract = {{The 3D shear deformation and failure behaviour of a glass fibre reinforced polypropylene in a shear strain rate range of γ˙=2.2×10−4 to 3.4 1s is investigated. An Iosipescu testing setup on a servo-hydraulic high speed testing unit is used to experimentally characterise the in-plane and out-of-plane behaviour utilising three specimen configurations (12-, 13- and 31-direction). The experimental procedure as well as the testing results are presented and discussed. The measured shear stress–shear strain relations indicate a highly nonlinear behaviour and a distinct rate dependency. Two methods are investigated to derive according material characteristics: a classical engineering approach based on moduli and strengths and a data driven approach based on the curve progression. In all cases a Johnson–Cook based formulation is used to describe rate dependency. The analysis methodologies as well as the derived model parameters are described and discussed in detail. It is shown that a phenomenologically enhanced regression can be used to obtain material characteristics for a generalising constitutive model based on the data driven approach.}},
author = {{Gerritzen, Johannes and Hornig, Andreas and Gröger, Benjamin and Gude, Maik}},
issn = {{2504-477X}},
journal = {{Journal of Composites Science}},
keywords = {{Engineering (miscellaneous), Ceramics and Composites}},
number = {{10}},
publisher = {{MDPI AG}},
title = {{{A Data Driven Modelling Approach for the Strain Rate Dependent 3D Shear Deformation and Failure of Thermoplastic Fibre Reinforced Composites: Experimental Characterisation and Deriving Modelling Parameters}}},
doi = {{10.3390/jcs6100318}},
volume = {{6}},
year = {{2022}},
}
@article{34251,
abstract = {{Joining by forming operations presents powerful and complex joining techniques. Clinching is a well-known joining process for use in sheet metalworking. Currently, clinched joints are focusing on mechanically enhanced connections. Additionally, the demand for integrating electrical requirements to transmit electrical currents will be increased in the future. This integration is particularly important, for instance, in the e-mobility sector. It enables connecting battery cells with electrical joints of aluminum and copper. Systematic use of the process-specific advantages of this joining method opens up the possibility to find and create electrically optimized connections. The optimization for the transmission of electrical currents will be demonstrated for clinched joints by adapting the tool geometry and the clinched joint design. Based on a comparison of the electrical joint resistance, the limit use temperature is defined for the joining materials used based on the microstructural condition and the aging condition due to artificial aging. As a result of the investigations carried out, reliable current transmission at a constant conductor temperature of up to 120 °C can be achieved for clinched copper–copper joints. In the case of pure aluminum joints and mixed joints of aluminum and copper, long-term stable current transmission can be ensured up to a conductor temperature of 100 °C.}},
author = {{Kalich, Jan and Matzke, Marcus and Pfeiffer, Wolfgang and Schlegel, Stephan and Kornhuber, Ludwig and Füssel, Uwe}},
issn = {{2075-4701}},
journal = {{Metals}},
keywords = {{General Materials Science, Metals and Alloys}},
number = {{10}},
publisher = {{MDPI AG}},
title = {{{Long-Term Behavior of Clinched Electrical Contacts}}},
doi = {{10.3390/met12101651}},
volume = {{12}},
year = {{2022}},
}
@article{34254,
abstract = {{A virtual test setup for investigating single fibres in a transverse shear flow based on a parallel-plate rheometer is presented. The investigations are carried out to verify a numerical representation of the fluid–structure interaction (FSI), where Arbitrary Lagrangian–Eulerian (ALE) and computational fluid dynamics (CFD) methods are used and evaluated. Both are suitable to simulate flexible solid structures in a transverse shear flow. Comparative investigations with different model setups and increasing complexity are presented. It is shown, that the CFD method with an interface-based coupling approach is not capable of handling small fibre diameters in comparison to large fluid domains due to mesh dependencies at the interface definitions. The ALE method is more suited for this task since fibres are embedded without any mesh restrictions. Element types beam, solid, and discrete are considered for fibre modelling. It is shown that the beam formulation for ALE and 3D solid elements for the CFD method are the preferred options.}},
author = {{Gröger, Benjamin and Wang, Jingjing and Bätzel, Tim and Hornig, Andreas and Gude, Maik}},
issn = {{1996-1944}},
journal = {{Materials}},
keywords = {{General Materials Science}},
number = {{20}},
publisher = {{MDPI AG}},
title = {{{Modelling and Simulation Strategies for Fluid–Structure-Interactions of Highly Viscous Thermoplastic Melt and Single Fibres—A Numerical Study}}},
doi = {{10.3390/ma15207241}},
volume = {{15}},
year = {{2022}},
}
@article{34257,
abstract = {{Galvanic corrosion is a destructive process between dissimilar metals. The present paper presents a constructed numerical test case to simulate galvanic corrosion of two dissimilar metals. This test case is used to study the accuracy of different implementations to track the dissolving anode boundary. One technique is to numerically simulate a mesh displacement based on the prescribed displacement at the anode boundary. The second method is to adjust only the boundary elements. Re-meshing after a certain number of time steps is applied to both implementations. They produce similar results for an electrical and electrochemical field problem. This work shows that mesh smoothing does not result in higher accuracy when modeling a moving anode front. Adjusting only the boundary elements is sufficient when frequent re-meshing is used.}},
author = {{Harzheim, Sven and Hofmann, Martin and Wallmersperger, Thomas}},
issn = {{0001-5970}},
journal = {{Acta Mechanica}},
keywords = {{Mechanical Engineering, Computational Mechanics}},
number = {{11}},
pages = {{4427--4439}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Comparison of two mesh-moving techniques for finite element simulations of galvanic corrosion}}},
doi = {{10.1007/s00707-022-03326-z}},
volume = {{233}},
year = {{2022}},
}
@inproceedings{34250,
abstract = {{As a joining-by-forming process, clinching and the use of functional elements enable low-energy joining of components through form, force, and, under certain conditions, material closure. In addition to the transmission of mechanical forces, these joining processes can be qualified for additional electrical contact within the scope of functional integration for electro-mobile applications. For this purpose, maximizing the force and material closure is necessary to ensure a long-term, stable transmission of electrical currents. To this end, the electrical properties of the joints were optimized. The investigations carried out show the long-term behavior under normal operating conditions and the short-circuit case.}},
author = {{Füssel, Uwe and Schlegel, Stephan and Reschke, Gregor and Kalich, Jan}},
booktitle = {{SFU/ICAFT 2022}},
publisher = {{MDPI}},
title = {{{Electrical Contacting of Aluminum Bus Bars Using Clinching and Functional Elements}}},
doi = {{10.3390/engproc2022026005}},
year = {{2022}},
}
@article{34414,
abstract = {{Given a steadily increasing demand on multi-material lightweight designs, fast and cost-efficient production technologies, such as the mechanical joining process clinching, are becoming more and more relevant for series production. Since the application of such joining techniques often base on the ability to reach similar or even better joint loading capacities compared to established joining processes (e.g., spot welding), few contributions investigated the systematic improvement of clinch joint characteristics. In this regard, the use of data-driven methods in combination with optimization algorithms showed already high potentials for the analysis of individual joints and the definition of optimal tool configurations. However, the often missing consideration of uncertainties, such as varying material properties, and the related calculation of their impact on clinch joint properties can lead to poor estimation results and thus to a decreased reliability of the entire joint connection. This can cause major challenges, especially for the design and dimensioning of safety-relevant components, such as in car bodies. Motivated by this, the presented contribution introduces a novel method for the robust estimation of clinch joint characteristics including uncertainties of varying and versatile process chains in mechanical joining. Therefore, the utilization of Gaussian process regression models is demonstrated and evaluated regarding the ability to achieve sufficient prediction qualities.}},
author = {{Zirngibl, Christoph and Schleich, Benjamin and Wartzack, Sandro}},
issn = {{0268-3768}},
journal = {{The International Journal of Advanced Manufacturing Technology}},
keywords = {{Industrial and Manufacturing Engineering, Computer Science Applications, Mechanical Engineering, Software, Control and Systems Engineering}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Robust estimation of clinch joint characteristics based on data-driven methods}}},
doi = {{10.1007/s00170-022-10441-7}},
year = {{2022}},
}
@article{34468,
abstract = {{Multiprofessionelle Kooperation zwischen allgemeinen und sonderpädagogischen Lehrkräften und mit weiteren Fachkräften, u.a. der Schulsozialarbeit, der Schulpsychologie und mit Schulbegleitungen, gilt bei der Entwicklung inklusiver Schulen als zentrale Stellschraube. Dementsprechend wird Kooperation im Kontext Schule auch in der universitären Ausbildung von zukünftig miteinander kooperierenden Professionen sowie in Fortbildungen für Lehrkräfte und multiprofessionelle Teams verstärkt ins Blickfeld gerückt. Zugleich lässt sich beobachten, dass in inklusiven Schulen bislang vermeintlich klare Zuständigkeiten, insbesondere zwischen Sonder- und Sozialpädagog*innen, aufweichen und neu austariert werden müssen. Bei der Entwicklung multiprofessioneller Teams gilt die Klärung von Rollen und Aufgaben als eine besondere Herausforderung, wenn unterschiedliche Professionen mit unterschiedlichen institutionellen Anbindungen und pädagogischen Zielperspektiven oder Grundhaltungen mitei-nander kooperieren. Das vorgestellte Instrument – der Rollenhut – dient dazu, in multiprofessionellen Gruppen eine individuelle Reflexion über die eigenen Aufgaben anzustoßen und auf dieser Grundlage gemeinsam über die gegenseitigen Erwartungen und Rollen zu diskutieren. Das Instrument wurde im Kontext von Fortbildungen multiprofessioneller Teams an Schulen konzipiert und auch im Rahmen der universitären Lehrer*innenbildung erprobt.}},
author = {{Neumann, Phillip and Hopmann, Benedikt and Lütje-Klose, Birgit}},
issn = {{2625-0675}},
journal = {{Herausforderung Lehrer*innenbildung - Zeitschrift zur Konzeption, Gestaltung und Diskussion}},
number = {{1}},
pages = {{13--25}},
title = {{{Der Rollenhut als Vermittlungsmedium - Rollenklärungsprozesse im Kontext multiprofessioneller Kooperationen als Thema universitärer Aus- und Fortbildungen von Lehrkräften und Sozialpädagog*innen}}},
doi = {{10.11576/HLZ-4949}},
volume = {{5}},
year = {{2022}},
}
@article{34461,
abstract = {{Teaching is a highly demanding profession that requires handling multiple and potentially contradictory goals. Therefore, it is likely that teachers experience conflict between work-related goals on a daily basis. Intraindividual goal conflict may occur when individuals pursue multiple goals drawing on the same limited resources (resource-based goal conflict), or when two or more goals are incompatible in terms of goal attainment strategy or desired end states (inherent goal conflict). Because goal conflict is typically associated with negative effects such as attenuated motivation and wellbeing, teacher goal conflict may jeopardize teaching motivation. This cross-sectional study investigated the effects of in-service teachers’ (N = 302) goal conflicts on their autonomous (intrinsic and identified regulation) and controlled (introjected and extrinsic regulation) teaching motivation and tested the satisfaction of teachers’ basic need for autonomy, competence, and relatedness as mediators. In line with our hypotheses, results from structural equation modeling showed that frequently experiencing resource-based goal conflict leads to a lower satisfaction of the basic need for autonomy, which, however, was unrelated to teaching motivation. In contrast, frequently experiencing inherent goal conflict attenuates the satisfaction of the basic need for competence, which, in turn, positively predicted autonomous teaching motivation and negatively predicted extrinsic regulation. As expected, relatedness was not associated with the experience of goal conflict. The discussion focuses on differential effects of the two types of goal conflict on teaching motivation and on the relevance to expand research on teachers’ intraindividual goal conflicts.}},
author = {{Gorges, Julia and Neumann, Phillip and Störtländer, Jan Christoph}},
issn = {{1664-1078}},
journal = {{Frontiers in Psychology}},
keywords = {{General Psychology}},
publisher = {{Frontiers Media SA}},
title = {{{Teachers Between a Rock and a Hard Place: Goal Conflicts Affect Teaching Motivation Mediated by Basic Need Satisfaction}}},
doi = {{10.3389/fpsyg.2022.876521}},
volume = {{13}},
year = {{2022}},
}
@techreport{34289,
author = {{Gorges, Julia and Neumann, Phillip and Wild, Elke and Lütje-Klose, Birgit and Grüter, Sandra and Weber, Antonia and Senior, Jonathan}},
pages = {{162}},
publisher = {{Univ. Bielefeld, Abteilung für Psychologie & Fakultät für Erziehungswissenschaft}},
title = {{{Bielefelder Fortbildungskonzept zur Kooperation in inklusiven Schulen (BiFoKi) : Technical Report V. 1.0}}},
doi = {{10.4119/unibi/2962493}},
year = {{2022}},
}
@inbook{33466,
abstract = {{We review our results of numerical simulations of light scattering from different systems of densely packed irregular particles. We consider spherical clusters, thick layers and monolayers with realistic topologies and dimensions much larger than the wavelength of light. The maximum bulk packing density of clusters is 0.5. A numerically exact solution of the electromagnetic problem is obtained using the Discontinuous Galerkin Time Domain method and with application of high- performance computing. We show that high packing density causes light localization in such structures which makes an impact on the opposition phenomena: backscattering intensity surge and negative linear polarization feature. Diffuse multiple scattering is significantly reduced in the case of non-absorbing particles and near-field interaction results in a percolation-like light transport determined by the topology of the medium. With this the negative polarization feature caused by single scattering gets enhanced if compared to lower density samples. We also confirm coherent double scattering mechanism of negative polarization for light scattered from dense absorbing slabs. In this case convergent result for the scattering angle polarization dependency at backscattering can be obtained for a layer of just a few tens of particles if they are larger than the wavelength.}},
author = {{Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}},
booktitle = {{Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media}},
editor = {{Kokhanovsky, Alexander}},
isbn = {{9783031102974}},
issn = {{2509-2790}},
keywords = {{tet_topic_scattering}},
publisher = {{Springer International Publishing}},
title = {{{Light Scattering by Large Densely Packed Clusters of Particles}}},
doi = {{10.1007/978-3-031-10298-1_4}},
volume = {{8}},
year = {{2022}},
}
@inproceedings{36335,
abstract = {{Transformation of Fe- and Cu-rich primary phase particles was studied in an Al-Li-based alloy prepared by twin-roll casting. Thin foils for combined STEM and SEM experiments were prepared by electrolytic twin-jet polishing. They were in-situ heated in a TEM heating stage and observed at 200 kV in the JEOL JEM 2200FS electron microscope equipped with STEM HAADF and BF detectors and SEM BSE and SE detectors working both in composition and topographic modes. The resulting structures were combined with EDS mapping performed directly in the heating holder. Dissolution and transformation of Cu- and Fe-rich particles occur above 500 °C. EDS maps acquired on the foil cooled down to room temperature show that Cu and Fe are both still present in newly formed particles, most likely indicating the presence of the Al7Cu2Fe phase.}},
author = {{CIESLAR, Miroslav and KŘIVSKÁ, Barbora and KRÁLÍK, Rostislav and BAJTOŠOVÁ, Lucia and Grydin, Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko}},
booktitle = {{METAL 2022 Conference Proeedings}},
issn = {{2694-9296}},
keywords = {{Al-Li-based alloy, in-situ TEM, homogenization, phase transformation}},
location = {{Brno}},
publisher = {{TANGER Ltd.}},
title = {{{HOMOGENIZATION OF TWIN-ROLL CAST Al-Li-BASED ALLOY STUDIED BY IN-SITU ELECTRON MICROSCOPY}}},
doi = {{10.37904/metal.2022.4438}},
year = {{2022}},
}
@techreport{36413,
author = {{Becker, Rieke and Lauert, Markus and Fischer, Jessica and Kirchhoff, Hannah and Kornbach, Alina and Januschewski, Katharina}},
title = {{{Tagungsbericht: Unverfügbarkeit – Widmung – Latenz: Das Heilige in der Kultur. Interdisziplinäre Tagung vom 16. bis 18. November 2021 an der Universität Paderborn}}},
year = {{2022}},
}
@inproceedings{36462,
abstract = {{The conduction of structure-borne sound through joints causes energy dissipation. The sound reduction index describes this energy loss as a level decrease in the particle velocity across series-connected damping elements for which the superposition principle applies. This simple model can help to develop a testing method for joints based on this characteristic energy loss. In this paper, this model is experimentally evaluated for multiple in-series clinched aluminium sheets. Samples connected by several clinch points arranged in parallel are investigated experimentally, and the results are discussed.}},
author = {{Stephan, Richard and Brosius, Alexander}},
booktitle = {{The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT}},
keywords = {{clinching, mechanical joining, damping, model, evaluation, dynamics}},
publisher = {{MDPI}},
title = {{{Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets}}},
doi = {{10.3390/engproc2022026025}},
year = {{2022}},
}
@inproceedings{36473,
abstract = {{Destructive micrograph analysis (MA) is the standard method for the assessment of clinched joints. However, during the joint preparation for the MA, geometric features of the joint can change due to elastic effects and closing cracks. X-ray computed tomography (CT) is a promising alternative to investigate the joint non-destructively. However, if the
material properties of similar joining partners are the same, the CT is not able to correctly resolve surfaces in the joint that are close to or pressing onto each other. These surfaces are relevant for the determination of characteristic dimensions such as neck thickness and undercut. By placing a thin, highly radiopaque tin layer between the joining partners, the interfacial area in the reconstructed volume can be highlighted. In this work, a method for the localisation of the tin layer inside the joint as well as threshold value procedures for the outer joint contour in cross section images are investigated. The measured characteristic dimensions are compared with measured values from MA of the same samples and of samples without tin layer. In addition, possible effects of the tin layer on the joining point
characteristics as well as problems of the MA are discussed.}},
author = {{Busch, Matthias and Köhler, Daniel and Hausotte, Tino and Kupfer, Robert and Troschitz, Juliane and Gude, Maik }},
title = {{{Approach to Determine the Characteristic Dimensions of Clinched Joints by Industrial X-ray Computed Tomography}}},
year = {{2022}},
}
@article{36524,
abstract = {{How can Knowledge In/Equity be addressed in qualitative research by taking the idea of Open Science into account? Two projects from the Open Science Fellows Programme by Wikimedia Deutschland will be used to illustrate how Open Science practices can succeed in qualitative research, thereby reducing In/Equity. In this context, In/Equity is considered as a fair and equal representation of people, their knowledge and insights and comprehends questions about how epistemic, structural, institutional and personal biases generate and shape knowledge as guidance. Three questions guide this approach: firstly, what do we understand by In/Equity in the context of knowledge production in these projects? Secondly, who will be involved in knowledge generation and to what extent will they be valued or unvalued? Thirdly, how can data be made accessible for re-use to enable true participation and sharing?}},
author = {{Steinhardt, Isabel and Kruschick, Felicitas}},
issn = {{2367-7163}},
journal = {{Research Ideas and Outcomes}},
keywords = {{Open Science, Knowledge Equity, Qualitative Methods}},
pages = {{e86387}},
publisher = {{Pensoft Publishers}},
title = {{{Knowledge Equity and Open Science in qualitative research – Practical research considerations}}},
doi = {{10.3897/rio.8.e86387}},
volume = {{8}},
year = {{2022}},
}
@article{36538,
abstract = {{Der Beitrag beschäftigt sich mit dem Gebrauch von sogenannten Open Educational Resources (OER) innerhalb der deutschsprachigen Soziologie. OER sind Lehr-und Lernmaterialien, die öffent-lich und frei von Kosten zugänglich sind sowie unter einer offenen Lizenz stehen, die es erlaubt, das Material frei zu nutzen, zu vervielfältigen und zu bearbeiten. Um diese Form der Bereitstellung von Lehr-und Lernmaterial zu fördern, sind im deutschen Sprachraum in den letzten Jahren verschie-dene digitale Infrastrukturen entstanden, die an einzelnen Hochschulstandorten, aber auch hochschulübergreifend Lehrenden zur Verfügung stehen, um dort ihr Material zu veröffentlichen. Es wurden 37 dieser Repositorien untersucht. Darüber hinaus wurde auch die Videoplattform YouTube nach soziologischem Lehr-und Lernmaterial durchforstet. Der Beitrag stellt den Zeitverlauf und die Akteur:innen der OER-Veröffentlichungen dar. Anschließend soll mithilfe eines praxistheoretischen Vokabulars die Lehre innerhalb der Soziologie aufgeschlüsselt und ein möglicher Bezug zu den empirischen Ergebnissen hergestellt werden.}},
author = {{Hiebl, Johannes and Steinhardt, Isabel and Bigos, Michael}},
issn = {{2199-8825}},
journal = {{die hochschule}},
keywords = {{Soziologie, Praxistheorie, Repositorien, Open Educational Resources, OER}},
number = {{8}},
pages = {{379--394}},
title = {{{Die (Un-)Sichtbarkeit von (offenen) Bildungsmaterialien in der Soziologie}}},
doi = {{10.3278/HSL2227W}},
year = {{2022}},
}
@inbook{36526,
abstract = {{Der Beitrag geht der Frage nach, welchen Herausforderungen Lehrende durch die digitale Lehre im ersten Corona-Semester 2020 begegnet sind und welche Strategien sie für deren Bewältigung gewählt haben. Als Datengrundlage dienendazu sechs autoethnographische Stories, entstanden im Projekt AEDiL. Diese haben sich als wertvolles Material erwiesen, um unmittelbare Einblicke in das Lehrhandeln und die -planung zu erhalten und die weiterführende Analyse zu ermöglichen. Dabei offenbarte sich der gemeinsame Anspruch der studierenden-zentrierten Lehre als wiederkehrendes Muster. Die mehrstufige Analyse legt offen, wie Lehrpersonen mit den Themen Beziehungsaufbau, Schaffung eines (digitalen) Raums sowie Sicherheit für Studierende umgehen und sich daraus Handlungsmuster entwickeln.}},
author = {{Ternes, Doris and Bernhard, Nadine and Gewinner, Irina and Goller, Antje and Lohner, David and König, Karsten and Röwert, Ronny and Steinhardt, Isabel and Thielsch, Angelika}},
booktitle = {{Hochschulen in der Pandemie. Impulse für eine nachhaltige Entwicklung von Studium und Lehre}},
editor = {{Angenent, Holger and Petri, Jörg and Zimenkova, Tatiana}},
isbn = {{ 978-3-8376-5984-9}},
pages = {{400--414}},
publisher = {{transkript}},
title = {{{Dem eigenen Anspruch auf der Spur}}},
doi = {{10.5445/IR/1000145819 }},
year = {{2022}},
}
@misc{47538,
author = {{Lammer, Christina}},
keywords = {{Kathleen Vereecken, Kinder- und Jugendliteratur, Krieg, Belgien}},
publisher = {{www.kibum.de (Thomas Boyken und Jörn Brüggemann)}},
title = {{{Die Kraft der Bilder. Funktionen neuer Illustrationen bei Übersetzungen. Kathleen Vereecken – Alles komt goed, altijd (2018) | Alles wird gut, immer (2021)}}},
year = {{2022}},
}
@inproceedings{27531,
abstract = {{The Quantum Singular Value Transformation (QSVT) is a recent technique that
gives a unified framework to describe most quantum algorithms discovered so
far, and may lead to the development of novel quantum algorithms. In this paper
we investigate the hardness of classically simulating the QSVT. A recent result
by Chia, Gily\'en, Li, Lin, Tang and Wang (STOC 2020) showed that the QSVT can
be efficiently "dequantized" for low-rank matrices, and discussed its
implication to quantum machine learning. In this work, motivated by
establishing the superiority of quantum algorithms for quantum chemistry and
making progress on the quantum PCP conjecture, we focus on the other main class
of matrices considered in applications of the QSVT, sparse matrices.
We first show how to efficiently "dequantize", with arbitrarily small
constant precision, the QSVT associated with a low-degree polynomial. We apply
this technique to design classical algorithms that estimate, with constant
precision, the singular values of a sparse matrix. We show in particular that a
central computational problem considered by quantum algorithms for quantum
chemistry (estimating the ground state energy of a local Hamiltonian when
given, as an additional input, a state sufficiently close to the ground state)
can be solved efficiently with constant precision on a classical computer. As a
complementary result, we prove that with inverse-polynomial precision, the same
problem becomes BQP-complete. This gives theoretical evidence for the
superiority of quantum algorithms for chemistry, and strongly suggests that
said superiority stems from the improved precision achievable in the quantum
setting. We also discuss how this dequantization technique may help make
progress on the central quantum PCP conjecture.}},
author = {{Gharibian, Sevag and Gall, François Le}},
booktitle = {{Proceedings of the 54th ACM Symposium on Theory of Computing (STOC)}},
pages = {{19--32}},
title = {{{Dequantizing the Quantum Singular Value Transformation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture}}},
year = {{2022}},
}
@article{47984,
abstract = {{Recent analyses by polarization resolved second-harmonic (SH) microscopy have demonstrated that ferroelectric (FE) domain walls (DWs) can possess non-Ising wall characteristics and topological nature. These analyses rely on locally analyzing the properties, directionality, and magnitude of the second-order nonlinear tensor. However, when inspecting FE DWs with SH microscopy, a manifold of different effects may contribute to the observed signal difference between domains and DWs, i.e., far-field interference, Čerenkov-type phase-matching (CSHG), and changes in the aforementioned local nonlinear optical properties. They all might be present at the same time and, therefore, require careful interpretation and separation. In this work, we demonstrate how the particularly strong Čerenkov-type contrast can selectively be blocked using dark- and bright-field SH microscopy. Based on this approach, we show that other contrast mechanisms emerge that were previously overlayed by CSHG but can now be readily selected through the appropriate experimental geometry. Using the methods presented, we show that the strength of the CSHG contrast compared to the other mechanisms is approximately 22 times higher. This work lays the foundation for the in-depth analysis of FE DW topologies by SH microscopy.}},
author = {{Hegarty, Peter A. and Beccard, Henrik and Eng, Lukas M. and Rüsing, Michael}},
issn = {{0021-8979}},
journal = {{Journal of Applied Physics}},
keywords = {{General Physics and Astronomy}},
number = {{24}},
publisher = {{AIP Publishing}},
title = {{{Turn all the lights off: Bright- and dark-field second-harmonic microscopy to select contrast mechanisms for ferroelectric domain walls}}},
doi = {{10.1063/5.0094988}},
volume = {{131}},
year = {{2022}},
}