cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Elimination of the numerical Cerenkov instability for spectral EM-PIC codes
Creators: name: Yu, Peicheng
name: Xu, Xinlu
name: Decyk, Viktor K.
name: Fiuza, F.
name: Vieira, Jorge
name: Tsung, Frank S.
name: Fonseca, Ricardo A.
name: Lu, Wei
name: Silva, Luis O.
name: Mori, Warren B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: When using an electromagnetic particle-in-cell (EM-PIC) code to simulate a relativistically drifting plasma, a violent numerical instability known as the numerical Cerenkov instability (NCI) occurs. The NCI is due to the unphysical coupling of electromagnetic waves on a grid to wave-particle resonances, including aliased resonances, i.e., $ω+ 2πμ/Δt=(k_1+ 2πν_1/Δx_1)v_0$, where $μ$ and $ν_1$ refer to the time and space aliases and the plasma is drifting relativistically at velocity $v_0$ in the $\hat{1}$-direction. Recent studies have shown that an EM-PIC code which uses a spectral field solver and a low pass filter can eliminate the fastest growing modes of the NCI. Based on these studies a new spectral PIC code for studying laser wakefield acceleration (LWFA) in the Lorentz boosted frame was developed. However, we show that for parameters of relevance for LWFA simulations in the boosted frame, a relativistically drifting plasma is susceptible to a host of additional unstable modes with lower growth rates, and that these modes appear when the fastest growing unstable modes are filtered out. We show that these modes are most easily identified as the coupling between modes which are purely transverse (EM) and purely longitudinal (Langmuir) in the rest frame of the plasma for specific time and space aliases. We rewrite the dispersion relation of the drifting plasma for a general field solver and obtain analytic expressions for the location and growth rate for each unstable mode, i.e, for each time and space aliased resonances. We show for the spectral solver that when the fastest growing mode is eliminated a new mode at the fundamental resonance ($μ=ν_1=0$) can be seen. (Please check the whole abstract in the paper).
description: 36 pages, 12 figures
Coherent control of a nuclear spin via interactions with a rare-earth ion in the solid-state
Creators: name: Uysal, Mehmet T.
name: Raha, Mouktik
name: Chen, Songtao
name: Phenicie, Christopher M.
name: Ourari, Salim
name: Wang, Mengen
name: Van de Walle, Chris G.
name: Dobrovitski, Viatcheslav V.
name: Thompson, Jeff D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Individually addressed Er$^{3+}$ ions in solid-state hosts are promising resources for quantum repeaters, because of their direct emission in the telecom band and compatibility with silicon photonic devices. While the Er$^{3+}$ electron spin provides a spin-photon interface, ancilla nuclear spins could enable multi-qubit registers with longer storage times. In this work, we demonstrate coherent coupling between the electron spin of a single Er$^{3+}$ ion and a single $I=1/2$ nuclear spin in the solid-state host crystal, which is a fortuitously located proton ($^1$H). We control the nuclear spin using dynamical decoupling sequences applied to the electron spin, implementing one- and two-qubit gate operations. Crucially, the nuclear spin coherence time exceeds the electron coherence time by several orders of magnitude, because of its smaller magnetic moment. These results provide a path towards combining long-lived nuclear spin quantum registers with telecom-wavelength emitters for long-distance quantum repeaters.
Disciplines, Outcomes and Purpose in Social Science Education
Creators: name: Davies, Peter
name: Dunnill, Richard
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: The gap between school knowledge and academic knowledge has long been acknowledged. The division of the curriculum into separate academic subjects has sometimes been blamed for this problem. On this reading it would make sense to re-model the curriculum so that teaching is multidisciplinary. However, efforts to achieve this ideal have a poor record in England. In this paper we suggest that the answer to the problem is more likely to lie in the way that the curriculum is built from a careful analysis of the actual outcomes of learning. We briefly outline three projects that are based on this supposition, describing the theoretical underpinnings and the main features of the projects.
description: JSSE - Journal of Social Science Education, 4-2006: Disciplinarity and Interdisciplinarity in Civic and Economic Education
No Prestige, No Money, No Contribution? The German Social Sciences’ Didactics and the Omissions of Sociology: What it is All About
Creators: name: Späte, Katrin
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Kein Abstract vorhanden No Abstract available
description: JSSE - Journal of Social Science Education, 4-2006: Disciplinarity and Interdisciplinarity in Civic and Economic Education
Melatonin protects against defects induced by methoxychlor in porcine oocyte maturation
Creators: name: Geng, Zhaojun
name: Zhang, Mingjun
name: Shi, Shuming
name: Hu, Bing
name: Liu, Liying
name: Chi, Zhichao
name: Qu, Linyi
name: Jin, Yongxun
name: Yu, Xianfeng
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Mental Health

description: Methoxychlor (MXC) is a widely used organochlorine pesticide primarily targeting pests. However, MXC has been found to negatively impact the reproductive system of both humans and animals, triggering oxidative stress and apoptosis. Melatonin (MLT), an endogenous hormone, possesses various benefits, including circadian rhythm regulation and anti-inflammatory and antioxidative stress effects. Moreover, MLT plays a crucial role in the development of animal germ cells and embryos. This study aimed to investigate the impact of MLT on porcine oocytes exposed to MXC. The experimental findings revealed that 200 μM MXC had detrimental effects on the maturation of porcine oocytes. However, the addition of 10−8 M MLT mitigated the toxic effects of MXC. MXC induced oxidative stress in porcine oocytes, leading to an increase in reactive oxygen species and impairing mitochondrial function. Consequently, oocyte quality was affected, resulting in elevated levels of early apoptosis and DNA damage, ultimately negatively impacting subsequent embryonic development. However, the addition of MLT showed the potential to ameliorate the damage caused by MXC. In conclusion, our results suggest that MLT exhibits a protective effect against MXC-induced damage to porcine oocyte maturation.
Digital Transformation and Mediation in European Fine Art Museums: Shaping the Future of Cultural Heritage
Creators: name: Reis, Catarina
Publisher: name: Zenodo
Year: 2023

description: This poster proposal explores the evolving role of digital technology as a mediator in European fine art museums, shedding light on the transformative journey of these cultural institutions. As museums have played diverse roles throughout history, from promoting civic pride to attracting tourism, they now face new challenges in democratizing access and engaging with individual visitors rather than demographic groups.
In recent decades, digital technology has emerged as a pivotal force reshaping the museum experience. With the advent of the third technological revolution in the 20th century, society witnessed a rapid shift in consumer behavior towards intensive use of digital devices and platforms. Recognizing this shift, museums began to harness digital technologies as powerful tools to reach diverse audiences effectively.
Common digital mediation approaches in European fine art museums include smartphone apps, multimedia guides, gamification, storytelling, artificial intelligence, augmented/virtual reality, and 3D reproductions. These technologies empower museums to engage visitors regardless of their backgrounds and preferences.
To gain insights into current trends, we conducted a comprehensive study of digital projects within European fine art museums. Our analysis provides a snapshot of the present landscape, revealing how museums are reshaping their policies, strategies, and missions. Critical questions arise about museums' responsiveness to audience needs, knowledge sharing, collaboration, and fostering interdisciplinary experiences to ensure cultural diversity and global engagement.
This poster presentation aims to foster discussions on the future of museums in the digital age, emphasizing the role of technology as a bridge between cultural heritage and contemporary society. We invite fellow researchers and practitioners to explore the dynamic interplay between digital mediation and European fine art museums, envisioning new possibilities for cultural preservation, education, and engagement.
Experimental demonstration of a two-band superconducting state for lead using scanning tunneling spectroscopy
Creators: name: Ruby, Michael
name: Heinrich, Benjamin W.
name: Pascual, Jose I.
name: Franke, Katharina J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The type I superconductor lead (Pb) has been theoretically predicted to be a two-band superconductor. We use scanning tunneling spectroscopy (STS) to resolve two superconducting gaps with an energy difference of 150$\,μ$eV. Tunneling into Pb(111), Pb(110) and Pb(100) crystals reveals a strong dependence of the two coherence peak intensities on the crystal orientation. We show that this is the result of a selective tunneling into the two bands at the energy of the two coherence peaks. This is further sustained by the observation of signatures of the Fermi sheets in differential conductance maps around subsurface defects. A modification of the density of states of the two bands by adatoms on the surface confirms the different orbital character of each to the two sub-bands.
description: 5 pages, 4 figures
Civic Education as an Interdisciplinary Subject in Austria - A Review
Creators: name: Filzmaier, Peter
name: Klepp, Cornelia
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: The article gives an overview of Civic Education (CE) inside the Austrian school system. CE has an interdisciplinary approach as a teaching principle but is also part of regular subjects like history. The introduction of CE as such a principle has been extremely important, but in some cases its existence is willingly used as an alibi for later inactivity. It is argued that there is especially a total lack of initial and further teacher trainings on CE. CE threatens to become an area of contents and didactics chosen by chance. A systematic analysis and evaluation of its interdisciplinary focus is still at the very beginning.
description: JSSE - Journal of Social Science Education, 4-2006: Disciplinarity and Interdisciplinarity in Civic and Economic Education
Integration by parts and vector differential forms in higher order variational calculus on fibred manifolds
Creators: name: Matsyuk, Roman Ya.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 58E30, 70Sxx, 58A15

description: Infinitesimal variation of Action functional in classical (non-quantum) field theory with higher derivatives is presented in terms of well-defined intrinsic geometric objects independent of the particular field which varies. 'Integration by parts' procedure for this variation is then described in purely formal language and is shown to consist in application of nonlinear Green formula to the vertical differential of the Lagrangian. Euler-Lagrange expressions and the Green operator are calculated by simple pull-backs of certain vector bundle valued differential forms associated with the given variational problem.
description: 15 figures
The Research on Moral and Civic Education in the Spanish Educational Theory - Evolution and Current Trends
Creators: name: Naval, Concepción
name: Jover, Gonzalo
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: With this paper the editors of the Journal of Social Science Education start a new kind of report which presents an overview of scholarly discourses on civic education and economic education in several European countries. The overall aim is to provide a first access to these discourses which are often rather difficult to reach. By publishing reports on these national scientific fields the editors of JSSE hope to facilitate the mutual perception of scholars and the development of a European discourse. The NECE database “Networking European Citizenship Education” which is available at http://www.nece.eu and at the German Federal Agency of Civic Education may help networking, too.
description: JSSE - Journal of Social Science Education, 4-2006: Disciplinarity and Interdisciplinarity in Civic and Economic Education
On the parallel spectrum in MHD Turbulence
Creators: name: Beresnyak, Andrey
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Anisotropy of MHD turbulence has been studied extensively for many years, most prominently by measurements in the solar wind and high resolution simulations. The spectrum parallel to the local magnetic field was observed to be steeper than perpendicular spectrum, typically $k^{-2}$, consistent with the widely accepted Goldreich-Sridhar (1995) model. In this Letter I looked deeper into the nature of the relation between parallel and perpendicular spectra and argue that this $k^{-2}$ scaling has the same origin as the $ω^{-2}$ scaling of Lagrangian frequency spectrum in strong hydrodynamic turbulence. This follows from the fact that Alfvén waves propagate along magnetic field lines. It is now became clear that the observed anisotropy can be argued without invocation of the "critical balance" argument and is more robust that was previously thought. The relation between parallel (Lagrangian) and perpendicular (Eulerian) spectra is inevitable consequence of strong turbulence of Alfven waves, rather than a conjecture based on the uncertainty relation. I tested this using high-resolution simulations of MHD turbulence, in particular I verified that the cutoff of the parallel spectrum scales as Kolmogorov timescale, not lengthscale.
description: ApJ Letters, accepted
title: Die Zelebrierung des Balkanmenschen bei Emir Kusturica
Creators: name: Ilic, Matija
Year: 2022

description: Die vorliegende Arbeit analysiert das Gesamtwerk des bosnisch-serbischen Regisseurs Emir Kusturica auf den Aspekt der Zelebrierung des Balkanmenschen. Der Filmemacher invertiert in seiner Kunst das primitive Bild des Balkanmenschen zu einem positiv-vitalen Primitivismus und hat dieses Konzept mit der Zeit u.a. auf die Musikperformance und Architektur ausgeweitet, aber auch mittels einer Selbstinszenierung entscheidend zu seinem Gesamtkunstwerk beigetragen. Das erste Kapitel der Arbeit gibt chronologisch einen Einblick in das Leben und Werk Kusturicas und soll nicht nur dazu dienen, alle seine Projekte kurz vorzustellen, sondern auch helfen, einen zeitlichen Überblick zu bewahren. Das zweite Kapitel beschäftigt sich mit dem Phänomen des Balkanismus. Hierbei wird aufgezeigt, wie im Westen ein Bild des primitiven Balkans konstruiert wurde. Zudem wird die popularkulturelle Bewegung der New Primitives vorgestellt, welche dieses Bild invertiert und als größter Einfluss auf Kusturicas Balkan-Poetik verstanden werden kann. Im dritten Kapitel dieser Arbeit wird analysiert, wie Kusturica das Bild des Balkanmenschen in seinen Filmen ästhetisch umsetzt, indem er sich als Konventionsbrecher präsentiert und eine Exzentrik und Einzigartigkeit in seine Bildsprache einführt, von welcher sein Gesamtwerk gekennzeichnet ist. Das vierte und zentrale Kapitel der Arbeit setzt sich mit der tatsächlichen Präsentation des Balkanmenschen in Kusturicas Filmen auseinander. Im ersten Unterkapitel wird Kusturicas Verwendung von Exzess und Karneval dargestellt, für welche vor allem die Musik eine tragende Rolle spielt. Der dafür stellvertretende Film Underground (1995) wird näher beleuchtet, der das zentrale Werk in Kusturicas Opus bildet und zahlreiche Debatten im Zusammenhang mit der Balkanismus-Frage ausgelöst hat. Im zweiten Unterkapitel geht es um die Romadarstellung in den Filmen Dom za vešanje (1988) und Crna mačka, beli mačor (1998), denn Kusturica wählt hier Roma als größte ethnische Minderheit in Ex-Jugoslawien als Repräsentanten des Balkanmenschen. Im dritten Unterkapitel dieses Kapitels wird betrachtet, wie Kusturica in Hollywood mit Arizona Dream (1993) einen Film dreht, mit dem er die exotische Darstellung umkehrt und Amerika und den American Dream aus den Augen eines „Balkanmenschen“ dekonstruiert. Im fünften und letzten Kapitel wird schließlich aufgezeigt, wie Kusturica im neuen Jahrtausend seine Balkan-Poetik auf die Musikperformance und Architektur ausweitet, und wie er mit kontroversen Aktionen rund um die Identitätsfrage und Nationalismusdebatte seine Selbstinszenierung als Balkanmensch bekräftigt.
Collapse and revival structure of information backflow for a central spin coupled to a finite spin bath
Creators: name: Fan, Jingyi
name: Pang, Shengshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Markovianity of quantum dynamics is an important property of open quantum systems determined by various ingredients of the system and bath. Apart from the system-bath interaction, the initial state of the bath, etc., the dimension of the bath plays a critical role in determining the Markovianity of quantum dynamics, as a strict decay of the bath correlations requires an infinite dimension for the bath. In this work, we investigate the role of finite bath dimension in the Markovianity of quantum dynamics by considering a simple but nontrivial model in which a central spin is isotropically coupled to a finite number of bath spins, and show how the dynamics of the central spin transits from non-Markovian to Markovian as the number of the bath spins increases. The non-Markovianity is characterized by the information backflow from the bath to the system in terms of the trace distance of the system states. We derive the time evolution of the trace distance analytically, and find periodic collapse-revival patterns in the information flow. The mechanism underlying this phenomenon is investigated in detail, and it shows that the period of the collapse-revival pattern is determined by the competition between the number of the bath spins, the system-bath coupling strength, and the frequency detuning. When the number of bath spins is sufficiently large, the period of the collapse-revival structure as well as the respective collapse and revival times increase in proportion to the number of the bath spins, which characterizes how the information backflow decays with a large dimension of the bath. We also analyze the effect of the system-bath interaction strength and frequency detuning on the collapse-revival patterns of the information flow, and obtain the condition for the existence of the collapse-revival structure. The results are illustrated by numerical computation.
description: 21 pages, 10 figures. Typos corrected, close to the published version
A visual method for comparing article-level clustering approaches
Creators: name: Quianquian Xie
Publisher: name: Zenodo
Year: 2022

description: Understanding differences in the results obtained from different article-level clustering approaches is essential to select a suitable method for conducting a research project. The comparison is a source of understanding differences of approaches. However, previous comparative studies either only describe the differences between results, or only explain general reasons for differences. There is a lack of in-depth understanding of how different approaches affect results. We propose a visual method for comparing clustering approaches that aims to explore the in-depth reasons that approaches affect results. We constructed an overlay map for comparing the results obtained from two widely used article-level clustering approaches in the field of scientometrics, namely LDA and AC. Despite their popularity, these methods haven’t been compared yet. The overlay map intuitively shows the relations between clusters and topics, both one-to-one and one-to-many relations. It also shows clusters and topics that do not have any relations. The relations reflect the differences in the results obtained from the two clustering approaches. For instance, the one-to-many relations between clusters and topics reflect the different way of presenting knowledge organization (citation links and lexical similarities) of the same content by LDA and AC. It also reflects how the citation-based method (AC) and text-based clustering method (LDA) construct data and produce various results. Our work provides a visual method for comparing article-level clustering approaches. It can help to understand differences in the results obtained from different approaches, thus facilitating their selection for practical applications. However, there are lots of possibilities for improving and extending the research. In this paper, we only compared two approaches. In the future, more approaches can be compared. In addition, based on understanding how different approaches’ properties affect results, learning the merits and shortcomings of approaches, then linking approaches and decisions to the purpose of the analysis would be an important step forward.
Geometric Quantum Noise of Spin
Creators: name: Shnirman, Alexander
name: Gefen, Yuval
name: Saha, Arijit
name: Burmistrov, Igor S.
name: Kiselev, Mikhail N.
name: Altland, Alexander
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The presence of geometric phases is known to affect the dynamics of the systems involved. Here we consider a quantum degree of freedom, moving in a dissipative environment, whose dynamics is described by a Langevin equation with quantum noise. We show that geometric phases enter the stochastic noise terms. Specifically, we consider small ferromagnetic particles (nano-magnets) or quantum dots close to Stoner instability, and investigate the dynamics of the total magnetization in the presence of tunneling coupling to the metallic leads. We generalize the Ambegaokar-Eckern-Schön (AES) effective action and the corresponding semiclassical equations of motion from the U(1) case of the charge degree of freedom to the SU(2) case of the magnetization. The Langevin forces (torques) in these equations are strongly influenced by the geometric phase. As a first but nontrivial application we predict low temperature quantum diffusion of the magnetization on the Bloch sphere, which is governed by the geometric phase. We propose a protocol for experimental observation of this phenomenon.
description: 8 pages including Supplemental Material
Bildungsstandards und wirtschaftsberufliche Bildung
Creators: name: Fischer, Andreas
name: Bank, Volker
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Kein Abstract vorhanden No Abstract available
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Bildungsstandards. Kritische Reflexionen zu einem Oxymoron
Creators: name: Bank, Volker
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Der folgende Beitrag verfolgt das Anliegen, die Bildungsstandards auf ihre konzeptionelle und instrumentelle Eignung für das Ziel der Verbesserung der schulischen Erziehung durch ‚Outputsteuerung‘ kritisch zu überprüfen.Die Argumentation greift dabei vor allem konzeptionell-begriffliche und wissenschaftstheoretische Aspekte auf. Dabei zeigt sich eine fehlende Einbindung in den internationalen Diskurs der Pädagogik und zum längst gesicherten metatheoretischen Fundament des Falsifikationismus The paper discusses critically the introduction of standards in education. These are aiming at redirecting control of educational processes to output variables. By taking up arguments of concept and naming, and likewise of theory of science, both conceptual and instrumental qualities of standards shall be investigated. It will be demonstrated that there is a disconnection to earlier scientific outcomes in international educational science, and to epistemological standards of falsification.
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Deutsche Gesellschaft für ökonomische Bildung: Kompetenzen der ökonomischen Bildung für allgemein bildende Schulen und Bildungsstandards für den mittleren Schulabschluss, 2004
Creators: name: JSSE, Administrator
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Kein Abstract vorhanden No Abstract available
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Zu den Möglichkeiten der Implementation von Bildungsstandards in der wirtschaftsschulischen Bildung
Creators: name: Seeber, Günther
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Die aktuellen Vorschläge zur Einführung von Bildungsstandards an unseren Schulen arbeiten mit einem der Expertiseforschung entnommenen Domänenbegriff und mit dem Kompetenzmodell der Kognitionspsychologie. Beides steht im Widerspruch zur berufsschulischen Praxis bzw. zur berufspädagogischen Tradition: Domäne und Lernfeld kontrastieren ebenso wie das Handlungskompetenzmodell und das in den Vorschlägen zugrunde gelegte Kompetenzmodell. Der folgende Beitrag soll zeigen, dass trotz dieser Divergenzen eine Implementation von Bildungsstandards in der wirtschaftsschulischen Bildung möglich ist. Die Lösungen werden im Rückgriff auf Ergebnisse der fachdidaktischen Forschung und auf jene der Kompetenzdiagnostik in der beruflichen Weiterbildung entwickelt The recent proposals on introducing competence standards in our schools are based on two relevant concepts: First they refer to the domain concept as it is used in the research on expertise, and second, they use the competence model of cognitive psychology. Both concepts don’t fit to the traditional reflections of vocational pedagogy respectively to the practise of vocational education. The following article shall show that, in spite of the existing discrepancies, there is a possibility to harmonize the contrasting concepts and, as a consequence, to implement competence standards in vocational education. The solution refers to results of didactical research and to such of the research on recognising competence acquired in workday life.
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
The vacuum conservation theorem
Creators: name: Minguzzi, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A version of the vacuum conservation theorem is proved which does not assume the existence of a time function nor demands stronger properties than the dominant energy condition. However, it is shown that a stronger stable version plays a role in the study of compact Cauchy horizons.
description: 9 pages. v2,v3: fixed some typos
Orbital magnetoelectric effect in nanoribbons of transition metal dichalcogenides
Creators: name: Cysne, Tarik P.
name: Guimarães, Filipe S. M.
name: Canonico, Luis M.
name: Costa, Marcio
name: Rappoport, Tatiana G.
name: Muniz, R. B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The orbital magnetoelectric effect (OME) generically refers to the appearance of an orbital magnetization induced by an applied electric field. Here, we show that nanoribbons of transition metal dichalcogenides (TMDs) with zigzag (ZZ) edges may exhibit a sizeable OME activated by an electric field applied along the ribbons' axis. We examine nanoribbons extracted from a monolayer (1L) and a bilayer (2L) of MoS$_2$ in the trigonal (H) structural phase. Transverse profiles of the induced orbital angular momentum accumulations are calculated to first order in the longitudinally applied electric field. Our results show that close to the nanoribbon's edge-state crossings energy, the orbital angular momentum accumulations take place mainly around the ribbons' edges. They have two contributions: one arising from the orbital Hall effect (OHE) and the other consists in the OME. The former is transversely anti-symmetric with respect to the principal axis of the nanoribbon, whereas the latter is symmetric, and hence responsible for the resultant orbital magnetization induced in the system. We found that the orbital accumulation originating from the OHE for the 1L-nanoribbon is approximately half that of a 2L-nanoribbon. Furthermore, while the OME can reach fairly high values in 1L-TMD nanoribbons, it vanishes in the 2L ones that preserve spatial inversion symmetry.The microscopic features that justify our findings are also discussed.
description: 17 pages, 19 figures
Branes And Supergroups
Creators: name: Mikhaylov, Victor
name: Witten, Edward
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Geometric Topology (math.GT)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Extending previous work that involved D3-branes ending on a fivebrane with $θ_{\mathrm{YM}}\not=0$, we consider a similar two-sided problem. This construction, in case the fivebrane is of NS type, is associated to the three-dimensional Chern-Simons theory of a supergroup U$(m|n)$ or OSp$(m|2n)$ rather than an ordinary Lie group as in the one-sided case. By $S$-duality, we deduce a dual magnetic description of the supergroup Chern-Simons theory; a slightly different duality, in the orthosymplectic case, leads to a strong-weak coupling duality between certain supergroup Chern-Simons theories on $\mathbb{R}^3$; and a further $T$-duality leads to a version of Khovanov homology for supergroups. Some cases of these statements are known in the literature. We analyze how these dualities act on line and surface operators.
description: 143 pages
Deutsche Gesellschaft für ökonomische Bildung: Kompetenzen der ökonomischen Bildung für allgemein bildende Schulen und Bildungsstandards für den Grundschulabschluss, 2006
Creators: name: JSSE, Administrator
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Kein Abstract vorhanden No Abstract available
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Non-analytic magnetic field dependence of quasi-particle properties of two-dimensional metals
Creators: name: Drukier, Casper
name: Lange, Philipp
name: Kopietz, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that in a weak external magnetic field H the quasi-particle residue and the renormalized electron Lande factor of two-dimensional Fermi liquids exhibit a non-analytic magnetic field dependence proportional to |H| which is due to electron-electron interactions. We explicitly calculate the corresponding prefactors to second order in the interaction and show that they are determined by low-energy scattering processes involving only momenta close to the Fermi surface. Experimentally, these non-analytic terms can be detected from measurements of the magnetic field dependence of the density of states and the magnetoconductivity.
description: 11 pages, 5 figures
Bildungsstandards für die Berufsbildung aus europäischer Perspektive am Beispiel Großbritannien: Darstellung, Einordnung und Konsequenzen für die deutsche Debatte
Creators: name: Pilz, Matthias
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Bildungsstandards werden in diversen Ländern der EU in Zusammenhang mit der beruflichen Bildung diskutiert. Der vorliegende Beitrag skizziert die Standardisierung am Beispiel eines schottischen Modulangebots (SVQs) und vergleicht die Befunde mit den Gegebenheiten im deutschen Dualen System. Im schottischen Kontext ist neben dem Zusammenhang von Standardisierung und Modularisierung auch auf die korrespondierenden Konzepte des „competence based approach“ und der „Outputorientierung“ einzugehen. Dabei wird deutlich, dass die Verwendung identischer Begriffe in verschiednen Ländern wegen unterschiedlicher Bedeutungsinhalte zu Irritationen führen kann. Als Ergebnis lässt sich feststellen, dass die britisch-schottische Standardisierung outputorientiert ausgerichtet ist, Mindestanforderungen setzt und einen Fokus auf Testwerte besitzt. Hingegen ist das deutsche Dualen System auf den Input ausgerichtet, definiert Lernziele sowie Kompetenzen als übergreifendes Konstrukt und fixiert damit ein eher durchschnittliches Erwartungsniveau. Weiterhin wird im internationalen Kontext für eine weite Fassung und damit Definition des Begriffs der Standards bzw. Standardisierung plädiert, da eine alleinige Fokussierung auf Bildungsstandards andere wichtige Elemente der Normierung eines (Berufs-) Bildungssystems ausblenden würde. Dieser Sachverhalt gilt auch vor dem Hintergrund neuster Entwicklungen auf EU-Ebene, wie der Entwicklung eines Europäischen Qualifikationsrahmens (European Qualification Framework, EQF) und eines Kreditpunktesystems (European Credit Transfer System in Vocational Education and Training, ECVET).
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Interdisziplinäre Arbeitsgruppe BHTW: Kerncurriculum Lernbereich Beruf – Haushalt – Technik – Wirtschaft Arbeitslehre – Sekundarstufe I 2006
Creators: name: JSSE, Administrator
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Kein Abstract vorhanden No Abstract available
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Merkmale und Funktionen von "Bildungsstandards" in der Berufsbildung: Eine Analyse der Tradition und Entwicklung in ausgewählten europäischen Ländern und in der Europäischen Berufsbildungspolitik
Creators: name: Frommberger, Dietmar
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Die aktuellen Vorschläge zur Einführung von Bildungsstandards an unseren Schulen arbeiten mit einem der Expertiseforschung entnommenen Domänenbegriff und mit dem Kompetenzmodell der Kognitionspsychologie. Beides steht im Widerspruch zur berufsschulischen Praxis bzw. zur berufspädagogischen Tradition: Domäne und Lernfeld kontrastieren ebenso wie das Handlungskompetenzmodell und das in den Vorschlägen zugrunde gelegte Kompetenzmodell. Der folgende Beitrag soll zeigen, dass trotz dieser Divergenzen eine Implementation von Bildungsstandards in der wirtschaftsschulischen Bildung möglich ist. Die Lösungen werden im Rückgriff auf Ergebnisse der fachdidaktischen Forschung und auf jene der Kompetenzdiagnostik in der beruflichen Weiterbildung entwickelt.
description: JSSE - Journal of Social Science Education, 3-2006: Bildungsstandards und wirtschaftsberufliche Bildung - Konzeption und Reflexion im (inter-)nationalen Vergleich
Shock finding on a moving-mesh: I. Shock statistics in non-radiative cosmological simulations
Creators: name: Schaal, Kevin
name: Springel, Volker
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Cosmological shock waves play an important role in hierarchical structure formation by dissipating and thermalizing kinetic energy of gas flows, thereby heating the universe. Furthermore, identifying shocks in hydrodynamical simulations and measuring their Mach number accurately is critical for calculating the production of non-thermal particle components through diffusive shock acceleration. However, shocks are often significantly broadened in numerical simulations, making it challenging to implement an accurate shock finder. We here introduce a refined methodology for detecting shocks in the moving-mesh code AREPO, and show that results for shock statistics can be sensitive to implementation details. We put special emphasis on filtering against spurious shock detections due to tangential discontinuities and contacts. Both of them are omnipresent in cosmological simulations, for example in the form of shear-induced Kelvin-Helmholtz instabilities and cold fronts. As an initial application of our new implementation, we analyse shock statistics in non-radiative cosmological simulations of dark matter and baryons. We find that the bulk of energy dissipation at redshift zero occurs in shocks with Mach numbers around ${\cal M}\approx2.7$. Furthermore, almost $40\%$ of the thermalization is contributed by shocks in the warm hot intergalactic medium (WHIM), whereas $\approx60\%$ occurs in clusters, groups and smaller halos. Compared to previous studies, these findings revise the characterization of the most important shocks towards higher Mach numbers and lower density structures. Our results also suggest that regions with densities above and below $δ_b=100$ should be roughly equally important for the energetics of cosmic ray acceleration through large-scale structure shocks.
description: 16 pages, 13 figures, published in MNRAS, January 2015
Verhüllen oder Enthüllen? - Ästhetik als Herausforderung für Sozialwissenschaft und sozialwissenschaftliche Bildungs
Creators: name: Besand, Anja
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Gerade in den klassischen Bezugswissenschaften der politischen Bildung haben die Begriffe Ästhetik, ästhetisch und Ästhetisierung seit einigen Jahren Konjunktur. So spricht man in der Soziologie seit fast 20 Jahren wieder von Lebensstilen und beschreibt damit den Sachverhalt, dass gesellschaftliche Gruppen sich nicht mehr ausreichend durch klassische demographische Daten differenzieren lassen, sondern sich durch Konsumstile und Selbstinszenierungen, also durch ästhetisches Verhalten, gruppieren und somit orientieren. Alltagsästhetik ist ein wichtiges Stichwort in diesem Kontext. In der Politikwissenschaft sind es Begriffe wie: Politik als Showgeschäft, Politik als Theater, Politik im Unterhaltungsformat oder Politainment die im Kontext der Debatte über die Ästhetisierung der Politik auftauchen. Plötzlich interessiert man sich verstärkt für Wahlwerbung, für die Konstruktion politischer Wirklichkeit und politische Performanz und damit für die Frage, wie politische oder auch soziale Sachverhalte gesellschaftlich wahrgenommen werden oder wie sie sich vermitteln. Für die politikdidaktische Diskussion müssten solche Auseinandersetzungen eigentlich von zentralem Interesse sein, denn es ist der professionelle Auftrag dieser Disziplin, sich mit der Vermittlung von Politik wissenschaftlich zu beschäftigen, doch bislang tut sich die politische Bildung mit dem Ästhetischen eher schwer. Im Folgenden soll der Versuch unternommen werden das Verhältnis von Ästhetik und politischer Bildung genauer nachzugehen, sowie die Ursachen und Gründen für die Abneigung der politischen Bildung zu identifizieren. Darüber hinaus sollen aber auch die Chancen betrachtet werden, die sich durch das Ästhetische für das Fach ergeben könnten.
description: JSSE - Journal of Social Science Education, 2-2006: Ästhetik/Entrepreneurship
Strukturelle Audiovisualistik – Grundlagen einer Ästhetischen Feldforschung
Creators: name: Clausen, Bernd
Publisher: name: JSSE - Journal of Social Science Education
Year: 2006

description: Die Strukturelle Audiovisualistik legt den Schwerpunkt auf die integrativen, pluralistischen Elemente auditiver und visueller Wahrnehmung, um Zusammenhänge und Beziehungsmuster sinnlicher Einzelerlebnisse aufzuspüren, deren Verbundenheit zu erkennen und in einem dritten, kreativ-praktischen Schritt darzustellen. Die Methode zur Gewinnung jener ästhetischen Daten ist die Ästhetische Feldforschung. Im Folgenden wird zunächst das Modell einer Strukturellen Audiovisualistik dargestellt, dann unser Verständnis einer Ästhetischen Feldforschung erläutert und anhand eines Beispiels Arbeitsweisen skizziert.
description: JSSE - Journal of Social Science Education, 2-2006: Ästhetik/Entrepreneurship
My robot makes friends in Europe
Creators: name: Hoxha, Irma
Publisher: name: Zenodo
Year: 2023

description: We are building a story about one robot that travels in several places in Europe and he meets people in those places.There are conversations in several languages. This is how the historical places are being visited and how he makes friends. Each student builts their story using scratch apps. I'm leading them into the process. As per the narrative part of the conference, I will describe the importance if using technology in way to make a nise approach to cultural heritage. The story told in this way makes it easy for the kids to come together for the main subject and the benefits of ICT in their learning processes.
title: lékař*ka, hoststvo a 25 tisíc návštěvnic*íků: (un-)mögliche Formen?
Creators: name: Katzinger, Lena
Year: 2022

description: Obwohl Perzeptionsstudien für verschiedene Genussprachen und auch speziell für das Tschechische wiederholt belegt haben, dass die Verwendung des generischen Maskulinums zur Diskriminierung von Frauen und genderqueeren Personen führt, ist diese Form in den meisten Bereichen des tschechischen Sprachraums noch immer weit verbreitet. Diese Arbeit setzt sich daher zum Ziel, sprachtypologische und sprachökonomische Argumente gegen die Verwendung genderinklusiver Sprache im Tschechischen kritisch zu betrachten und anhand einer aussagekräftigen Anzahl von Beispielen aus der Praxis zu zeigen, wie antidiskriminierendes Sprachhandeln bereits umgesetzt wird. Zur Beantwortung der Forschungsfragen wurde ein Korpus aus Facebook-Beiträgen fünf feministischer und queer-aktivistischer Organisationen erstellt, das insgesamt 1.419 Beiträge umfasst. Die Codierung und Auswertung relevanter Formen erfolgten in Microsoft Excel. Die quantitative Analyse der Belege zeigte, dass in 64 % der Fälle, in denen laut aktuellen Grammatiken ein generisches Maskulinum zu verwenden wäre, Alternativen dazu gefunden wurden. Die große Vielfalt an inklusiveren Formen wurde in spezifischen qualitativen Analysen anschließend auf ihr Potential überprüft, Menschen verschiedener Genderidentitäten zu repräsentieren. Abschließend zeigte sich, dass generische Maskulina in den untersuchten Facebook-Beiträgen meist sehr einfach durch Alternativen zu ersetzen sind, was darauf hindeutet, dass der Einsatz inklusiverer Sprache meist nicht an grammatikalischen Faktoren, sondern an der fehlenden Bereitschaft der Sprecher*innen scheitert.
Accuracy of downfolding based on the constrained random phase approximation
Creators: name: Shinaoka, Hiroshi
name: Troyer, Matthias
name: Werner, Philipp
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the reliability of the constrained random phase approximation (cRPA) method for the calculation of low-energy effective Hamiltonians by considering multi-orbital lattice models with one strongly correlated "target" band and two weakly correlated "screening" bands. The full multi-orbital system and the effective model are solved within dynamical mean field theory (DMFT) in a consistent way. By comparing the quasi-particle weights for the correlated bands, we examine how accurately the effective model describes the low-energy properties of the multi-band system. We show that the violation of the Pauli principle in the cRPA method leads to overscreening effects when the inter-orbital interaction is small. This problem can be overcome by using a variant of the cRPA method which restores the Pauli principle.
description: 13 pages, 11 figures
"e-fairytale journey": A project based on the European Fairytale Route and the Sustainable Development Goals
Creators: name: Spitsa, Aikaterini
name: Iltsiou, Aikaterini
Publisher: name: Zenodo
Year: 2023

description: Fairy tales are a common heritage of European citizens and a great educational tool for teachers. Our project is based on the European Fairy Tale Route, which became a Cultural Route of the Council of Europe in 2022. It is a unique cultural route for both children and adults. Ollie, our mascot, was born in a library. She grew up on all kinds of stories and fairy tales. One day she decided to travel all over Europe to investigate all the magical places she read about in the stories. These stories are part of the local culture of Europeans. A journey full of activities, new technologies will begin. During this trip she assigned us some missions related to the 17 Sustainable Development Goals. With Ollie we discovered authors, characters and places through many activities, took part in STEAM activities and created a lot of collaborative producs. During this journey, Europeana website was utilized.