cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tunneling density of states, correlation energy, and spin polarization in the fractional quantum Hall regime
Creators: name: Chaudhary, Gaurav
name: Efimkin, Dmitry K.
name: MacDonald, Allan H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We derive exact sum-rules that relate the tunneling density of states (TDOS) of spinful electrons in the fractional quantum Hall (FQH) regime to the spin-dependent many body ground state correlation energy. Because the tunneling process is spin-conserving, the 2D (two-dimensional) to 2D tunneling current $I$ at a given bias voltage $V$ in a spin-polarized system is a sum of majority and minority spin contributions. The sum rules can be used to define spin-dependent gaps that we associate with peaks in 2D to 2D tunneling $I-V$ curves. We discuss different scenarios of tunneling between layers at different fillings in relation to our sum rules. We comment on what recent tunneling experiments say about spin-dependent correlations in light of our sum rules, and propose additional measurements that could provide more specific experimental estimates of spin-dependent correlation energies.
description: 10 pages, 3 figures
From exploration to control: learning object manipulation skills through novelty search and local adaptation
Creators: name: Kim, Seungsu
name: Coninx, Alexandre
name: Doncieux, Stephane
Publisher: name: arXiv
Year: 2019
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Programming a robot to deal with open-ended tasks remains a challenge, in particular if the robot has to manipulate objects. Launching, grasping, pushing or any other object interaction can be simulated but the corresponding models are not reversible and the robot behavior thus cannot be directly deduced. These behaviors are hard to learn without a demonstration as the search space is large and the reward sparse. We propose a method to autonomously generate a diverse repertoire of simple object interaction behaviors in simulation. Our goal is to bootstrap a robot learning and development process with limited information about what the robot has to achieve and how. This repertoire can be exploited to solve different tasks in reality thanks to a proposed adaptation method or could be used as a training set for data-hungry algorithms. The proposed approach relies on the definition of a goal space and generates a repertoire of trajectories to reach attainable goals, thus allowing the robot to control this goal space. The repertoire is built with an off-the-shelf simulation thanks to a quality diversity algorithm. The result is a set of solutions tested in simulation only. It may result in two different problems: (1) as the repertoire is discrete and finite, it may not contain the trajectory to deal with a given situation or (2) some trajectories may lead to a behavior in reality that differs from simulation because of a reality gap. We propose an approach to deal with both issues by using a local linearization of the mapping between the motion parameters and the observed effects. Furthermore, we present an approach to update the existing solutions repertoire with the tests done on the real robot. The approach has been validated on two different experiments on the Baxter robot: a ball launching and a joystick manipulation tasks.
description: 30 pages, 18 figures, accepted for publication in Robotics and Autonomous Systems
Direct data-driven LPV control of nonlinear systems: An experimental result
Creators: name: Verhoek, Chris
name: Abbas, Hossam S.
name: Tóth, Roland
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We demonstrate that direct data-driven control of nonlinear systems can be successfully accomplished via a behavioral approach that builds on a Linear Parameter-Varying (LPV) system concept. An LPV data-driven representation is used as a surrogate LPV form of the data-driven representation of the original nonlinear system. The LPV data-driven control design that builds on this representation form uses only measurement data from the nonlinear system and a priori information on a scheduling map that can lead to an LPV embedding of the nonlinear system behavior. Efficiency of the proposed approach is demonstrated experimentally on a nonlinear unbalanced disc system showing for the first time in the literature that behavioral data-driven methods are capable to stabilize arbitrary forced equilibria of a real-world nonlinear system by the use of only 7 data points.
description: Accepted to the 22nd IFAC World Congress 2023 (IFAC2023)
Chronology protection in $f(T)$ gravity: the case of Gott's pair of moving cosmic strings
Creators: name: Fiorini, Franco
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: As a consequence of the spacetime structure, defined by the tetrad field instead of the metric tensor alone, $f(T)$ gravity seems to harbor its own chronology protection agency. When Gott's pair of moving cosmic strings is considered, it is shown that the requirement of having a global parallelization -- i.e. a global smooth field of tetrads -- drastically restrict the form of the tetrads on the junction surface between the two strings. The junction conditions on the tetrad field are satisfied only if the corresponding boosts needed to put the strings in motion are null on the matching surface. This seems to throw overboard Gott's construction from the outset without the need of analyzing the divergence of the expectation value of the energy momentum tensor on the Cauchy horizon, evading in this way bothering quarrels concerning the choice of vacuum.
description: 6 pages, 2 figures
Dark Matter-Radiation Scattering Enhances CMB Phase Shift through Dark Matter-loading
Creators: name: Ghosh, Subhajit
name: Ho, Daven Wei Ren
name: Tsai, Yuhsin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A phase shift in the acoustic oscillations of CMB spectra is a characteristic signature for the presence of non-photon radiation propagating differently from photons, even when the radiation couples to SM particles solely gravitationally. It is well-established that compared to the presence of free-streaming radiation, CMB spectra shift to higher $\ell$-modes in the presence of self-interacting non-photon radiation such as neutrinos and dark radiation. In this study, we further demonstrate that the scattering of non-photon radiation with dark matter can further amplify this phase shift. We show that when the energy density of the interacting radiation surpasses that of interacting dark matter around matter-radiation equality, the phase shift enhancement is proportional to the interacting dark matter abundance and remains insensitive to the radiation energy density. Given the presence of dark matter-radiation interaction, this additional phase shift emerges as a generic signature of models featuring an interacting dark sector or neutrino-dark matter scattering. Using neutrino-dark matter scattering as an example, we numerically calculate the amplified phase shift and offer an analytical interpretation of the result by modeling photon and neutrino perturbations with coupled harmonic oscillators. This framework also explains the phase shift contrast between self-interacting and free-streaming neutrinos. Fitting models with neutrino-dark matter or dark radiation-dark matter interactions to CMB and large-scale structure data, we validate the presence of the enhanced phase shift, affirmed by the linear dependence observed between the preferred regions of the sound horizon angle $θ_s$ and interacting dark matter abundance. An increased $θ_s$ and a suppressed matter power spectrum is therefore a generic feature of models containing dark matter scattering with abundant dark radiation.
description: 54 pages, 22 figures, 5 tables, v2 to match version published in JCAP
Hype or Heuristic? Quantum Reinforcement Learning for Join Order Optimisation
Creators: name: Franz, Maja
name: Winker, Tobias
name: Groppe, Sven
name: Mauerer, Wolfgang
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Databases (cs.DB)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Identifying optimal join orders (JOs) stands out as a key challenge in database research and engineering. Owing to the large search space, established classical methods rely on approximations and heuristics. Recent efforts have successfully explored reinforcement learning (RL) for JO. Likewise, quantum versions of RL have received considerable scientific attention. Yet, it is an open question if they can achieve sustainable, overall practical advantages with improved quantum processors.
 In this paper, we present a novel approach that uses quantum reinforcement learning (QRL) for JO based on a hybrid variational quantum ansatz. It is able to handle general bushy join trees instead of resorting to simpler left-deep variants as compared to approaches based on quantum(-inspired) optimisation, yet requires multiple orders of magnitudes fewer qubits, which is a scarce resource even for post-NISQ systems.
 Despite moderate circuit depth, the ansatz exceeds current NISQ capabilities, which requires an evaluation by numerical simulations. While QRL may not significantly outperform classical approaches in solving the JO problem with respect to result quality (albeit we see parity), we find a drastic reduction in required trainable parameters. This benefits practically relevant aspects ranging from shorter training times compared to classical RL, less involved classical optimisation passes, or better use of available training data, and fits data-stream and low-latency processing scenarios. Our comprehensive evaluation and careful discussion delivers a balanced perspective on possible practical quantum advantage, provides insights for future systemic approaches, and allows for quantitatively assessing trade-offs of quantum approaches for one of the most crucial problems of database management systems.
Additional file 3: of Epidemiology of non-traumatic spinal cord injury in Uganda: a single center, prospective study with MRI evaluation
Creators: name: Musubire, Abdu
name: Meya, David
name: Katabira, Elly
name: Meyer, Ana
name: Bohjanen, Paul
name: Boulware, David
name: Minja, Frank
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Neuroscience
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Cancer

description: Figure S1. Survival Time from Diagnosis of Non-traumatic Spinal Cord Lesion by MRI Classification. (DOCX 26 kb)
Pointer States in the Born-Markov approximation
Creators: name: Singh, Uttam
name: Sawicki, Adam
name: Korbicz, Jarosław K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Explaining the emergence of classical properties of a quantum system through its interaction with the environment has been one of the promising ideas on how to understand the notorious quantum-to-classical transition. A pivotal role in this approach is played by, so called, pointer states which are quantum states least affected by the environment and are ``carriers" of classical behavior. We develop here a general method on how to find pointer states. Working within the Born-Markov approximation, we combine methods of group theory and open quantum systems to derive explicit equations describing pointer states. They contain variances squared of certain operators, thus resembling the defining equations of coherent states, but are in general different from the latter. This shows that two notions of being ``the closest to the classical" -- one defined by the uncertainty relations and the other by the interaction with the environment -- are in general different. As an example, we study arbitrary spin-$J$ systems interacting with bosonic or spin thermal environments and find explicitly pointer states for $J=1$.
description: Introduction re-written from a different perspective, references expanded, title changed. Main text and findings unchanged. Comments welcome
Similarity and Quality Metrics for MR Image-To-Image Translation
Creators: name: Dohmen, Melanie
name: Klemens, Mark A.
name: Baltruschat, Ivo M.
name: Truong, Tuan
name: Lenga, Matthias
Publisher: name: arXiv
Year: 2024
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Image-to-image translation can create large impact in medical imaging, as images can be synthetically transformed to other modalities, sequence types, higher resolutions or lower noise levels. To ensure patient safety, these methods should be validated by human readers, which requires a considerable amount of time and costs. Quantitative metrics can effectively complement such studies and provide reproducible and objective assessment of synthetic images. If a reference is available, the similarity of MR images is frequently evaluated by SSIM and PSNR metrics, even though these metrics are not or too sensitive regarding specific distortions. When reference images to compare with are not available, non-reference quality metrics can reliably detect specific distortions, such as blurriness. To provide an overview on distortion sensitivity, we quantitatively analyze 11 similarity (reference) and 12 quality (non-reference) metrics for assessing synthetic images. We additionally include a metric on a downstream segmentation task. We investigate the sensitivity regarding 11 kinds of distortions and typical MR artifacts, and analyze the influence of different normalization methods on each metric and distortion. Finally, we derive recommendations for effective usage of the analyzed similarity and quality metrics for evaluation of image-to-image translation models.
description: 44 pages (main: 22 pages, 3 figures, supplement: 22 pages, 15 figures)
Effective Field Theory of the Zero-Temperature Triangular-Lattice Antiferromagnet: A Monte Carlo Study
Creators: name: Yin, Hui
name: Chakraborty, Bulbul
name: Gross, Nicholas
Publisher: name: arXiv
Year: 1999
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using a Monte Carlo coarse-graining technique introduced by Binder et al., we have explicitly constructed the continuum field theory for the zero-temperature triangular Ising antiferromagnet. We verify the conjecture that this is a gaussian theory of the height variable in the interface representation of the spin model. We also measure the height-height correlation function and deduce the stiffness constant. In addition, we investigate the nature of defect-defect interactions at finite temperatures, and find that the two-dimensional Coulomb gas scenario applies at low temperatures.
description: 26 pages, 9 figures
Derecho al Olvido en el Perú: Cómo Eliminar Denuncias Archivadas de Internet y Proteger tu Reputación
Creators: name: ARANIBAR OSORIO, JUAN PABLO
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 440708
subject: Public administration

description: Análisis jurídico sobre el derecho al olvido y la protección de datos personales en el Perú. Se examinan los marcos normativos, la jurisprudencia nacional y los mecanismos legales —como la tutela de derechos— para solicitar la eliminación de datos personales en buscadores. El estudio incluye recomendaciones para la cooperación institucional con la Autoridad Nacional de Protección de Datos Personales y lineamientos para mitigar el impacto reputacional en la función pública.
title: Making und künstliche Intelligenz: digitale Lernbegleitung für schulische Making-Prozesse
Creators: name: Maurer, Björn
Publisher: name: Publikationsserver der Pädagogischen Hochschule Thurgau
Year: 2019
Subjects: Künstliche Intelligenz
Digitalisierung
Schule

description: Eine große Herausforderung im schulischen Making ist die Betreuung individueller Schüler*innen-Projekte. Insbesondere bei anspruchsvollen Materialien, ausgefallenen Ideen und großen Lerngruppen stoßen Lehrpersonen an Kapazitäts- und Kompetenzgrenzen. Moderne Technologien, basierend auf künstlicher Intelligenz (KI), könnten Lehrpersonen künftig bei ihrer Unterrichtstätigkeit unterstützen. Die Autoren zeigen in ihrem Beitrag auf, wo Unterstützungsbedarf bei Entwicklungs- und Lernprozessen im MakerSpace besteht und wie ein digitaler Lernbegleiter auf der Grundlage von KI eingesetzt werden könnte. Dabei werden auch kritische Aspekte dieser Innovation beleuchtet.
description: Chance Makerspace: Making trifft auf Schule, p. 329
title: ADCO, Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome VI, Cart. 190 (11 H 75), 316 folios, f. 0218v
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome VI, Archives départementales de la Côte-d'Or, Cart. 190 (11 H 75), 316 folios, f. 0218v, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome VI, Archives départementales de la Côte-d'Or, Cart. 190 (11 H 75), 316 folios, f. 0218v, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
Additional file 6: of Seroprevalence of hepatitis E in adults in Brazil: a systematic review and meta-analysis
Creators: name: FĂĄtima Tengan
name: Gerusa Figueiredo
name: Nunes, Arielle
name: Manchiero, Carol
name: Dantas, Bianca
name: Magri, Mariana
name: Thamiris Prata
name: Nascimento, Marisa
name: Mazza, Celso
name: Abdala, Edson
name: Barone, Antonio
name: Wanderley Bernardo
Publisher: name: figshare
Year: 2019
Subjects: subject: Space Science
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Science Policy

description: Seroprevalence of Hepatitis E in studies with a quality evaluation scoreâ >â 5. (PDF 26 kb)
Explainable AI for Ship Collision Avoidance: Decoding Decision-Making Processes and Behavioral Intentions
Creators: name: Yoshioka, Hitoshi
name: Hashimoto, Hirotada
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This study developed an explainable AI for ship collision avoidance. Initially, a critic network composed of sub-task critic networks was proposed to individually evaluate each sub-task in collision avoidance to clarify the AI decision-making processes involved. Additionally, an attempt was made to discern behavioral intentions through a Q-value analysis and an Attention mechanism. The former focused on interpreting intentions by examining the increment of the Q-value resulting from AI actions, while the latter incorporated the significance of other ships in the decision-making process for collision avoidance into the learning objective. AI's behavioral intentions in collision avoidance were visualized by combining the perceived collision danger with the degree of attention to other ships. The proposed method was evaluated through a numerical experiment. The developed AI was confirmed to be able to safely avoid collisions under various congestion levels, and AI's decision-making process was rendered comprehensible to humans. The proposed method not only facilitates the understanding of DRL-based controllers/systems in the ship collision avoidance task but also extends to any task comprising sub-tasks.
description: 24 pases and 15 figures. If you need the program, please contuct us
Hidden $SU(2)$ Symmetries, the Symmetry Hierarchy and the Emergent Eight-Fold Way in Spin-1 Quantum Magnets
Creators: name: Jin, Hui-Ke
name: Miao, Jian-Jian
name: Zhou, Yi
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The largest allowed symmetry in a spin-1 quantum system is an $SU(3)$ symmetry rather than the $SO(3)$ spin rotation. In this work, we reveal some $SU(2)$ symmetries as subgroups of $SU(3)$ that, to the best of our knowledge, have not previously been recognized. Then, we construct $SU(2)$ symmetric Hamiltonians and explore the ground-state phase diagram in accordance with the $SU(3)\supset SU(2)\times U(1)$ symmetry hierarchy. It is natural to treat the eight generators of the $SU(3)$ symmetry on an equal footing; this approach is called the eight-fold way. We find that the spin spectral functions and spin quadrupole spectral functions share the same structure, provided that the elementary excitations are flavor waves at low energies, which serves as a clue to the eight-fold way. An emergent $S=1/2$ quantum spin liquid is proposed to coexist with gapful spin nematic order in one of the ground states. In analogy to quantum chromodynamics, we find the gap relation for hydrodynamic modes in quantum spin-orbital liquid states, which is nothing but the Gell-Mann-Okubo formula.
description: 8 pages of main text, 10 pages of appendices
title: Handis, Headis & co. – Coole Ballspiele
Creators: name: Richard, Thomas
name: Schelble, Gabriel
name: Wacker, Sarah
name: Rellstab, Thomas
name: Straub, Marcel
Publisher: name: Publikationsserver der Pädagogischen Hochschule Thurgau
Year: 2019

description: Ein Ball ist die ultimative Einladung zum Spiel, seinem Reiz kann man sich kaum entziehen. Diese Faszination kommt auch bei einer Gruppe von Ballspielen zum Ausdruck, die zu den vielfältigsten überhaupt zählt: den «Rückschlagspielen». Eine ihrer Stärken ist, dass sich für fast alle Orte und Anlässe ein passendes und animierendes Spiel finden lässt. Dieses Schwerpunktthema zeigt einfach umzusetzende, fast vergessene und trendige Möglichkeiten für die spielerische Bereicherung von Unterricht, Training, Lager, Ausflug, Fest und Freizeit auf.
description: Mobilesport, no. 5, p. 1
Grace periods in comparative effectiveness studies of sustained treatments
Creators: name: Wanis, Kerollos Nashat
name: Sarvet, Aaron L.
name: Wen, Lan
name: Block, Jason P.
name: Rifas-Shiman, Sheryl L.
name: Robins, James M.
name: Young, Jessica G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Researchers are often interested in estimating the effect of sustained use of a treatment on a health outcome. However, adherence to strict treatment protocols can be challenging for individuals in practice and, when non-adherence is expected, estimates of the effect of sustained use may not be useful for decision making. As an alternative, more relaxed treatment protocols which allow for periods of time off treatment (i.e. grace periods) have been considered in pragmatic randomized trials and observational studies. In this article, we consider the interpretation, identification, and estimation of treatment strategies which include grace periods. We contrast natural grace period strategies which allow individuals the flexibility to take treatment as they would naturally do, with stochastic grace period strategies in which the investigator specifies the distribution of treatment utilization. We estimate the effect of initiation of a thiazide diuretic or an angiotensin-converting enzyme inhibitor in hypertensive individuals under various strategies which include grace periods.
METHODS USED IN TEACHING THE UZBEKI LANGUAGE AND PROBLEMS OF THEIR IMPROVEMENT
Creators: name: O'rokova, Yulduz
Publisher: name: Zenodo
Year: 2024

description: This scientific article analyzes the methods used in teaching the Uzbek language and issues of their improvement. Educational methods developed on the basis of interactive, communicative, linguistic and innovative approaches are of great importance in the process of effective teaching of the Uzbek language. The article discusses the uniqueness of these methods, their effectiveness, and ways to modernize them. It is also justified the necessity of enrichment of practical training and educational materials for learners of the Uzbek language, introduction of technologies that help the development of linguistic competence.
title: Rezension zu: Helbling, D. (2018). Warum feiern Menschen Feste? (1./2. Klasse). In: P. Trevisan und D. Helbling (Hrsg.). Nachdenken und vernetzen in Natur, Mensch, Gesellschaft. Studienbuch für den kompetenzorientierten Unterricht im 1. und 2. Zyklus. Bern: hep (S. 129–146)
Creators: name: Eilinger, Nicole
Publisher: name: Publikationsserver der Pädagogischen Hochschule Thurgau
Year: 2019
Subjects: Rezension

description: Zeitschrift für Religionskunde: ZFRK, no. 7, p. 54
Hybridization and Decay of Magnetic Excitations in two-dimensional Triangular Lattice Antiferromagnets
Creators: name: Kim, Taehun
name: Park, Kisoo
name: Leiner, Jonathan C.
name: Park, Je-Geun
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Elementary quasiparticles in solids such as phonons and magnons occasionally have nontrivial interactions between them, as well as among themselves. As a result, their energy eigenvalues are renormalized, the quasiparticles spontaneously decay into a multi-particle continuum state, or they are hybridized with each other when their energies are close. As discussed in this review, such anomalous features can appear dominantly in quantum magnets but are not, a priori, negligible for magnetic systems with larger spin values and noncollinear magnetic structures. We review the unconventional magnetic excitations in two-dimensional triangular lattice antiferromagnets and discuss their implications on related issues.
description: 18 pages, 9 figures
Spin and charge dynamics of the ferromagnetic and antiferromagnetic two-dimensional half-filled Kondo lattice model
Creators: name: Capponi, S.
name: Assaad, F. F.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a detailed numerical study of spin and charge dynamics of the two-dimensional Kondo lattice model with hopping t and exchange J. At T=0 and J > 0, the competition between the RKKY interaction and Kondo effect triggers a quantum phase transition between magnetically ordered and disordered insulators: J_c/t = 1.45(5). The quasiparticle gap scales as |J|. S(q,ω), evolves smoothly from its strong coupling form with spin gap at q = (π,π) to a spin wave form. At J>0, A(\vec{k},ω) shows a dispersion relation following that of hybridized bands. For J < J_c this feature is supplemented by shadows thus pointing to a coexistence of Kondo screening and magnetism. For J < 0 A(\vec{k},ω) is similar to that of non-interacting electrons in a staggered magnetic field. Spin, T_S, and charge, T_C, scales are defined. For weak to intermediate couplings, T_S marks the onset of antiferromagnetic fluctuations and follows a J^2 law. At strong couplings T_S scales as J. T_C scales as J both at weak and strong couplings. At and slightly below T_C we observe i) a rise in the resistivity as a function of decreasing temperature, ii) a dip in the integrated density of states at the Fermi energy and iii) the occurrence of hybridized bands in A(k,ω). It is shown that in the weak coupling limit, the charge gap of order J is of magnetic origin. The specific heat shows a two peak structure, the low temperature peak being of magnetic origin. Our results are compared to various mean-field theories.
description: 30 pages, 24 figures
title: Chance Makerspace: Making trifft auf Schule
Creators: name: :None
Publisher: name: kopaed
Year: 2019
Subjects: FabLab
Medienpädagogik
Selbstgesteuertes Lernen
Konstruieren
Handlungsorientiertes Lernen
Lernumwelt

description: MakerSpaces gelten als innovative Lernumgebungen für eigenverantwortliches, kreatives und kollaboratives Arbeiten mit analogen und digitalen Technologien. Die zugrundeliegenden Ansätze und Methoden wie «Konstruktionismus», «Learning by doing» und «Design Thinking» versprechen einen hohen Grad an Selbstwirksamkeit und Autonomie. Immer mehr Schulen machen sich auf den Weg und wagen erste Experimente im Bereich Making. Mit der Maker-Idee sind jedoch auch Prinzipien verbunden, die sich nicht immer vollständig mit den Strukturen der Schulwirklichkeit decken. Was passiert, wenn die Maker-Idee direkt auf Schule trifft? Wie gross sind die Chancen und Reibungspunkte? Welche Rahmenbedingungen braucht es für eine erfolgreiche Implementation? Dieser Band beschäftigt sich neben der Klärung von grundlegenden Begriffen und Perspektiven rund um das schulische Making mit konkreten Erfahrungen aus der schulischen und ausserschulischen Praxis. Fachexpert*innen aus der Deutschschweiz, Österreich und Deutschland diskutieren Best Practice Beispiele sowie didaktische und konzeptionelle Fragen.
Boundary conditions for drift-diffusion equations in gas-discharge plasmas
Creators: name: Gorin, V. V.
name: Kudryavtsev, A. A.
name: Yao, Jingfeng
name: Yuan, Chengxun
name: Zhou, Zhongxiang
Publisher: name: arXiv
Year: 2018
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This paper develops a general approach to the derivation of the boundary conditions for hydrodynamic equations for charged and neutral plasma components. It includes both a well-known classical case for pure diffusion, and considers the expressions for diffusion and drift together - for an absorbing (neutralizing) wall with partial reflection and the possible emission of plasma components. Some unclear and controversial terms found in the existing literature are clarified. Several examples of applications of the results, which illustrate the properties of boundary conditions for electrons and ions, are calculated and analyzed.
description: This is a revised version of our paper that was primarelly submitted to Physical Review E - 2018, November, 24. Now it is published in Physics of Plasmas 27, 1 (2020). After publication, a mistake in the Sample IV.C is corrected
Assessing Student Learning Using a Digital Grading Platform
Creators: name: Stevens, Andrew W.
name: Stevens, Andrew W.
Publisher: name: Unknown
Year: 2019
Subjects: subject: Teaching/Communication/Extension/Profession
subject: Assessment
subject: digital grading
subject: student learning objectives

description: Effective assessment of student learning is challenging for several reasons. Not only do learning assessments usually crowd out instructional time, but it can be difficult to assess higher-order cognitive aspects of student learning. In this commentary, I present a method for assessing student learning through the use of a digital grading platform that addresses both of these issues. I discuss a case study where this method was implemented and utilized to inform course design, and I argue that digital grading platforms expand instructors’ options for student learning assessments.
Calculating and Interpreting Percentage Changes for Economic Analysis
Creators: name: Anderson, Matthew A.
name: Anderson, Matthew A.
Publisher: name: Unknown
Year: 2019
Subjects: subject: Teaching/Communication/Extension/Profession
subject: Growth rates
subject: percentage change

description: A strong understanding of calculating and interpreting percentage changes and growth rates is critically important for economists. This is because many fundamental concepts such as the time value of money, and many commonly reported economic measures, such as the rate of return on assets, price inflation, and measures of economic growth, require a firm understanding of percentage changes. This paper presents a brief primer on calculating and interpreting percentage changes and growth rates. The purpose is to illuminate these measures, facilitate their interpretation, and clarify their usage for economic analysis.
The Excess of HERA High$-Q^2$ Events and Leptoquarks in a Left-Right Symmetric Preon Model
Creators: name: Sekiguchi, Motoo
name: Wada, Hiroaki
name: Ishida, Shin
Publisher: name: arXiv
Year: 1997
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: An interpretation that the HERA excess events are due to intermediate production and decay of composite leptoquarks in the left-right symmetric preon model is given. Because of the preon-line rule, expected to be valid well, the event-ratio of neutral to charged current interactions is predicted to be one.
description: 7 pages
Additional file 5: of Seroprevalence of hepatitis E in adults in Brazil: a systematic review and meta-analysis
Creators: name: FĂĄtima Tengan
name: Gerusa Figueiredo
name: Nunes, Arielle
name: Manchiero, Carol
name: Dantas, Bianca
name: Magri, Mariana
name: Thamiris Prata
name: Nascimento, Marisa
name: Mazza, Celso
name: Abdala, Edson
name: Barone, Antonio
name: Wanderley Bernardo
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Science Policy

description: Tests for Publication Bias. Tests for Publication Bias. (DOCX 11 kb)
An upper bound on the number of perfect quadratic forms
Creators: name: van Woerden, Wessel P. J.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 11H55, 05E18

description: In a recent preprint on arXiv Roland Bacher showed that the number $p_d$ of non-similar perfect $d$-dimensional quadratic forms satisfies $e^{Ω(d)} < p_d < e^{O(d^3\log(d))}$. We improve the upper bound to $e^{O(d^2\log(d))}$ by a volumetric argument based on Voronoi's first reduction theory.
Additional file 1: of Epidemiology of non-traumatic spinal cord injury in Uganda: a single center, prospective study with MRI evaluation
Creators: name: Musubire, Abdu
name: Meya, David
name: Katabira, Elly
name: Meyer, Ana
name: Bohjanen, Paul
name: Boulware, David
name: Minja, Frank
Publisher: name: figshare
Year: 2019
Subjects: Medicine
Cell Biology
Neuroscience
Biotechnology
Developmental Biology

description: Appendix Table S1: Categorization of lesions by MRI anatomical location (DOCX 12 kb)
Dyonic dilaton black holes
Creators: name: Poletti, S. J.
name: Twamley, J.
name: Wiltshire, D. L.
Publisher: name: arXiv
Year: 1995
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The properties of static spherically symmetric black holes, which are both electrically and magnetically charged, and which are coupled to the dilaton in the presence of a cosmological constant, Lambda, are considered. It is shown that apart from the Reissner-Nordstrom-de Sitter solution with constant dilaton, such solutions do not exist if Lambda > 0 (in arbitrary spacetime dimension >=4 ). However, asymptotically anti-de Sitter dyonic black hole solutions with a non-trivial dilaton do exist if Lambda < 0. Both these solutions and the asymptotically flat (Lambda = 0) solutions are studied numerically for arbitrary values of the dilaton coupling parameter, g_0, in four dimensions. The asymptotically flat solutions are found to exhibit two horizons if g_0 = 0, 1, \sqrt{3}, \sqrt{6}, ..., \sqrt{n(n+1)/2},..., and one horizon otherwise. For asymptotically anti-de Sitter solutions the result is similar, but the corresponding values of g_0 are altered in a non-linear fashion which depends on Lambda and the mass and charges of the black holes. All dyonic solutions with Lambda <= 0 are found to have zero Hawking temperature in the extreme limit, however, regardless of the value of g_0.
description: 24 pages, phyzzx, epsf, 7 in-text figures. Small addition to introduction, and a few extra references
Dual topological insulator with mirror symmetry protected helical edge states
Creators: name: Campos, Warlley H.
name: Penteado, Poliana H.
name: Zanon, Julian
name: Junior, Paulo E. Faria
name: Candido, Denis R.
name: Egues, J. Carlos
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Dual topological insulators (DTIs) are simultaneously protected by time-reversal and crystal symmetries, representing advantageous alternatives to conventional topological insulators. By combining ab initio calculations and the $\mathbf{k}\cdot\mathbf{p}$ approach, here, we investigate the electronic band structure of a Na$_2$CdSn triatomic layer and derive a low-energy $4\times 4$ effective model consistent with all the symmetries of this material class. We obtain the effective Hamiltonian using the Löwdin perturbation theory, the folding-down technique, and the theory of invariants and determine its parameters by fitting our analytical dispersion relations to those of ab initio calculations. We then calculate the bulk topological invariants of the system and show that the Na$_2$CdSn triatomic layer is a giant-gap (hundreds of millielectronvolts) quasi-two-dimensional DTI characterized by both spin and mirror Chern numbers $-2$. In agreement with the bulk-boundary correspondence theorem, we find that a finite-width strip of Na$_2$CdSn possesses two pairs of counterpropagating helical edge states per interface. We obtain analytical expressions for the edge state energy dispersions and wave functions, which are shown to agree with our numerical calculations. Our work opens an avenue for further studies of Na$_2$CdSn as a potential DTI candidate with room-temperature applications in areas of technological interest, such as nanoelectronics and spintronics.
Statistical Analysis of Native Contact Formation in the Folding of Designed Model Proteins
Creators: name: Tiana, G.
name: Broglia, R. A.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Condensed Matter (cond-mat)
subject: Quantitative Biology (q-bio)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The time evolution of the formation probability of native bonds has been studied for designed sequences which fold fast into the native conformation. From this analysis a clear hierarchy of bonds emerge a) local, fast forming highly stable native bonds built by some of the most strongly interacting amino acids of the protein, b) non-local bonds formed late in the folding process, in coincidence with the folding nucleus, and involving essentially the same strongly interacting amino acids already participating in the fast bonds, c) the rest of the native bonds whose behaviour is subordinated, to a large extent, to that of the local- and non-local native contacts.
title: Grosses Potential für Schulen der Zukunft: MakerSpaces ermöglichen und erfordern neue Lernformen und Schulentwicklung
Creators: name: Merz, Thomas
Publisher: name: Publikationsserver der Pädagogischen Hochschule Thurgau
Year: 2019
Subjects: FabLab
Medienpädagogik

description: Chance Makerspace: Making trifft auf Schule, p. 33
Direct laser-written optomechanical membranes in fiber Fabry-Perot cavities
Creators: name: Tenbrake, Lukas
name: Faßbender, Alexander
name: Hofferberth, Sebastian
name: Linden, Stefan
name: Pfeifer, Hannes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Integrated micro and nanophotonic optomechanical experiments enable the manipulation of mechanical resonators on the single phonon level. Interfacing these structures requires elaborate techniques limited in tunability, flexibility, and scaling towards multi-mode systems. Here, we demonstrate a cavity optomechanical experiment using 3D-laser-written polymer membranes inside fiber Fabry-Perot cavities. Vacuum coupling strengths of ~ 30 kHz to the fundamental megahertz mechanical mode are reached. We observe optomechanical spring tuning of the mechanical resonator by tens of kHz exceeding its linewidth at cryogenic temperatures. The extreme flexibility of the laser writing process allows for a direct integration of the membrane into the microscopic cavity. The direct fiber coupling, its scaling capabilities to coupled resonator systems, and the potential implementation of dissipation dilution structures and integration of electrodes make it a promising platform for fiber-tip integrated accelerometers, optomechanically tunable multi-mode mechanical systems, or directly fiber-coupled systems for microwave to optics conversion.
description: 12 pages, 7 figures
Cohomology jump loci of 3-manifolds
Creators: name: Suciu, Alexander I.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55N25, 57M27, 16E45, 55P62, 57M05, 57M25, 57N10

description: The cohomology jump loci of a space $X$ are of two basic types: the characteristic varieties, defined in terms of homology with coefficients in rank one local systems, and the resonance varieties, constructed from information encoded in either the cohomology ring, or an algebraic model for $X$. We explore here the geometry of these varieties and the delicate interplay between them in the context of closed, orientable 3-dimensional manifolds and link complements. The classical multivariable Alexander polynomial plays an important role in this analysis. As an application, we derive some consequences regarding the formality and the existence of finite-dimensional models for such 3-manifolds.
description: 32 pages; accepted for publication in Manuscripta Mathematica
Deep Learning Calabi-Yau four folds with hybrid and recurrent neural network architectures
Creators: name: Dao, H. L.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Machine Learning (cs.LG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this work, we report the results of applying deep learning based on hybrid convolutional-recurrent and purely recurrent neural network architectures to the dataset of almost one million complete intersection Calabi-Yau four-folds (CICY4) to machine-learn their four Hodge numbers $h^{1,1}, h^{2,1}, h^{3,1}, h^{2,2}$. In particular, we explored and experimented with twelve different neural network models, nine of which are convolutional-recurrent (CNN-RNN) hybrids with the RNN unit being either GRU (Gated Recurrent Unit) or Long Short Term Memory (LSTM). The remaining four models are purely recurrent neural networks based on LSTM. In terms of the $h^{1,1}, h^{2,1}, h^{3,1}, h^{2,2}$ prediction accuracies, at 72% training ratio, our best performing individual model is CNN-LSTM-400, a hybrid CNN-LSTM with the LSTM hidden size of 400, which obtained 99.74%, 98.07%, 95.19%, 81.01%, our second best performing individual model is LSTM-448, an LSTM-based model with the hidden size of 448, which obtained 99.74%, 97.51%, 94.24%, and 78.63%. These results were improved by forming ensembles of the top two, three or even four models. Our best ensemble, consisting of the top four models, achieved the accuracies of 99.84%, 98.71%, 96.26%, 85.03%. At 80% training ratio, the top two performing models LSTM-448 and LSTM-424 are both LSTM-based with the hidden sizes of 448 and 424. Compared with the 72% training ratio, there is a significant improvement of accuracies, which reached 99.85%, 98.66%, 96.26%, 84.77% for the best individual model and 99.90%, 99.03%, 97.97%, 87.34% for the best ensemble. By nature a proof of concept, the results of this work conclusively established the utility of RNN-based architectures and demonstrated their effective performances compared to the well-explored purely CNN-based architectures in the problem of deep learning Calabi Yau manifolds.
description: v3: more discussions added, references added, typos corrected
"Quadratic solitons" in nonlinear dynamiical latticess
Creators: name: Konotop, Vladimir V.
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We propose a lattice model, in both one- and multidimensional versions, which may give rise to matching conditions necessary for the generation of solitons through the second-harmonic generation. The model describes an array of linearly coupled two-component dipoles in an anisotropic nonlinear host medium. Unlike this discrete system, its continuum counterpart gives rise to the matching conditions only in a trivial degenerate situation. A system of nonlinear evolution equations for slowly varying envelope functions of the resonantly coupled fundamental- and second-harmonic waves is derived. In the one-dimensional case, it coincides with the standard system known in nonlinear optics, which gives rise to stable solitons. In the multidimensional case, the system prove to be more general than its counterpart in optics, because of the anisotropy of the underlying lattice model.
description: 8 pages, revtex, no figures, submitted to Phys. Rev. B
Pseudoparticle Description of the 1D Hubbard Model Electronic Transport Properties
Creators: name: Peres, N. M. R.
name: Carmelo, J. M. P.
name: Campbell, D. K.
name: Sandvik, A. W.
Publisher: name: arXiv
Year: 1996
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We extend the pseudoparticle transport description of the Hubbard chain to all energy scales. In particular we compute the mean value of the electric current transported by any Bethe-ansatz state and the transport masses of the charge carriers. We present numerical results for the optical conductivity of the model at half-filling for values of U/t=3 and 4. We show that these are in good agreement with the pseudoparticle description of the finite-energy transitions involving new pseudoparticle energy bands.
description: 4 pages, RevTex, one figure (can be obtained upon request from peres@evunix.uevora.pt). To apper in the Proceedings of the Euroconference on "Correlations in Unconventional Quantum Liquids" in Zeitschrift f\"ur Physik B- Condensed Matter (Dedicated to the memory of Sir Rudolph Peierls)