cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Critical properties of a 2D frustrated magnet with non-magnetic impurities
Creators: name: Yasinskaya, D. N.
name: Ulitko, V. A.
name: Panov, Yu. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We report on classical Monte Carlo study of phase transitions and critical behavior of a 2D spin-pseudospin model describing a dilute magnet with competing charge and spin interactions. The static critical exponents of the specific heat and correlation length are calculated using the finite-size scaling theory in a wide range of model parameters. The order of phase transitions is analyzed within the energy histogram method. It is found that approaching the frustration point and increasing the density of non-magnetic impurities leads to non-universal critical behavior and first-order phase transitions. Features of non-universal critical behavior are shown to depend on the relationship between the parameters of the spin and pseudospin interactions.
description: 11 pages, 4 figures. IEEE Trans. on Magn. (2021)
Monolithically Patterned Wide-Narrow-Wide All-Graphene Devices
Creators: name: Unluer, Dincer
name: Tseng, Frank
name: Ghosh, Avik W.
name: Stan, Mircea R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate theoretically the performance advantages of all-graphene nanoribbon field-effect transistors (GNRFETs) whose channel and source/drain (contact) regions are patterned monolithically from a two-dimensional single sheet of graphene. In our simulated devices, the source/drain and interconnect regions are composed of wide graphene nanoribbon (GNR) sections that are semimetallic, while the channel regions consist of narrow GNR sections that open semiconducting bandgaps. Our simulation employs a fully atomistic model of the device, contact and interfacial regions using tight-binding theory. The electronic structures are coupled with a self-consistent three-dimensional Poisson's equation to capture the nontrivial contact electrostatics, along with a quantum kinetic formulation of transport based on non-equilibrium Green's functions (NEGF). Although we only consider a specific device geometry, our results establish several general performance advantages of such monolithic devices (besides those related to fabrication and patterning), namely the improved electrostatics, suppressed short-channel effects, and Ohmic contacts at the narrow-to-wide interfaces.
description: 9 pages, 11 figures, 2 tables
Rezension: Handbuch Bildungstechnologie. Konzeption und Einsatz digitaler Lernumgebungen von Helmut Niegemann, Armin Weinberger (Hg.)
Creators: name: Theurl, Jan
Publisher: name: Medienimpulse
Year: 2020

description: Das Handbuch Bildungstechnologie stellt den Versuch dar, den aktuellen Stand der deutschsprachigen Debatte zur bildungstechnologischen Forschung abzubilden und damit an den internationalen wissenschaftlichen Diskurs zur Educational oder Instructional Technology anzuknüpfen. Dafür werden auf etwas mehr als 700 Seiten und in insgesamt 37 Kapiteln verschiedene Aspekte und Sichtweisen auf das Forschungsfeld zusammengeführt. Es gelingt den Herausgebern und Autoren/Autorinnen dabei, vielseitige Einblicke in das Themenfeld zu geben und gleichzeitig einen relativ niederschwelligen Einstieg für Forscher und Forscherinnen sowie pädagogische Praktikerinnen und Praktiker bereitzustellen. Jan Theurl gibt in der vorliegenden Rezension einen Überblick über das inhaltliche Spektrum des Handbuchs und wirft einen kurzen Blick auf ausgewählte Aspekte der Publikation.
description: Medienimpulse, Bd. 58 Nr. 4 (2020): 4/2020 – Making und Makerlabs
Formulations of the Einstein equations for numerical simulations
Creators: name: Shinkai, Hisa-aki
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We review recent efforts to re-formulate the Einstein equations for fully relativistic numerical simulations. In order to complete a long-term and accurate simulations of binary compact objects, people seek a robust set of equations against the violation of constraints. Many trials have revealed that mathematically equivalent sets of evolution equations show different numerical stability in free evolution schemes. In this article, we overview the efforts of the community, categorizing them into three directions: (1) modifications of the standard Arnowitt-Deser-Misner equations initiated by the Kyoto group (the so-called Baumgarte-Shapiro-Shibata-Nakamura equations), (2) rewriting the evolution equations in a hyperbolic form, and (3) construction of an "asymptotically constrained" system. We then introduce our series of works that tries to explain these evolution behaviors in a unified way using eigenvalue analysis of the constraint propagation equations. The modifications of (or adjustments to) the evolution equations change the character of constraint propagation, and several particular adjustments using constraints are expected to damp the constraint-violating modes. We show several set of adjusted ADM/BSSN equations, together with their numerical demonstrations.
description: 15 pages, 12 figures; Invited Lecture at APCTP Winter School on Black Hole Astrophysics, Daejeon and Pohang, Korea, January 24-29, 2008
Kinder und Jugendliche in der Pandemie brauchen Begleitung externer Fachkräfte
Creators: name: Pospischill, Wolfgang
name: Schmelzer, Alexander
name: Luger, Michael
Publisher: name: Medienimpulse
Year: 2020

description: Distanzunterricht, digitale Geräte und Formate fordern die Schulen massiv. Doch neben IT-Kenntnissen brauchen Kinder und Jugendliche auch analoge und digitale Unterstützung bei Medienkompetenz, Sucht- und Gewaltprävention, die angesichts der aktuellen Schulsituation unterbelichtet bleiben.
description: Medienimpulse, Bd. 58 Nr. 4 (2020): 4/2020 – Making und Makerlabs
Theory of Vibrational Polariton Chemistry in the Collective Coupling Regime
Creators: name: Mandal, Arkajit
name: Li, Xinyang
name: Huo, Pengfei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We theoretically demonstrate that chemical reaction rate constant can be significantly suppressed by coupling molecular vibrations with an optical cavity, exhibiting both the collective coupling effect and the cavity-frequency modification of the rate constant. When a reaction coordinate is strongly coupled to the solvent molecules, the reaction rate constant is reduced due to the dynamical caging effect. We demonstrate that collectively coupling the solvent to the cavity can further enhance this dynamical caging effect, leading to additional suppression of the chemical kinetics. This effect is further amplified when cavity loss is considered.
Enhanced Electro-Optic Sampling with Quantum Probes
Creators: name: Virally, Stéphane
name: Cusson, Patrick
name: Seletskiy, Denis V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Employing electro-optic sampling (EOS) with ultrashort probe pulses, recent experiments showed direct measurements of quantum vacuum fields and their correlations on subcycle timescales. Here, we propose a quantum-enhanced EOS where photon-number entangled twin beams are used to derive conditioned non-classical probes. In the case of the quantum vacuum, this leads to a six-fold improvement in the signal-to-noise ratio over the classically-probed EOS. In addition, engineering of the conditioning protocol yields a reliable way to extract higher-order moments of the quantum noise distribution and robust discrimination of the input quantum states, for instance a vacuum and a few-photon cat state. These improvements open a viable route towards robust tomography of quantum fields in space-time, an equivalent of homodyne detection in energy-momentum space, and the possibility of precise experiments in real-space quantum electrodynamics.
description: 12 pages, 15 figures
Multiparticle Entanglement in the Lipkin-Meshkov-Glick Model
Creators: name: Cui, H. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The multiparticle entanglement in the Lipkin-Meshkov-Glick model has been discussed extensively in this paper. Measured by the global entanglement and its generalization, our calculation shows that the multiparticle entanglement can faithfully detect quantum phase transitions. For an antiferromagnetic case the multiparticle entanglement reaches the maximum at the transition point, whereas for ferromagnetic coupling, two different behaviors of multiparticle entanglement can be identified, dependent on the anisotropic parameter in the coupling.
description: 7 pages and 5 figures
Potenziale von Making-Aktivitäten in informellen Lernumgebungen für die Medienpädagogik
Creators: name: Bunke-Emden, Hannah
Publisher: name: Medienimpulse
Year: 2020

description: Making-Aktivitäten sind seit einigen Jahren nicht nur vermehrt in der medienpädagogischen Praxis zu finden, Maker Education ist außerdem auch im wissenschaftlichen (medienpädagogischen) Diskurs angekommen. Im Rahmen des Praxisprojektes Maker Days for Kids Leipzig – einer offenen, temporären, digitalen Werkstatt, in der Kinder und Jugendliche selbstbestimmt und interessenorientiert verschiedenen Making-Aktivitäten nachgehen können – wurde in einer Masterarbeit an der Universität Leipzig ein qualitatives Forschungsprojekt, angelehnt an die Methode der Grounded Theory, durchgeführt, um konkrete Potenziale von Making-Aktivitäten für die Medienpädagogik zu identifizieren. Es wurde herausgearbeitet, dass die (Lern )Erfahrungen der Kinder und Jugendlichen zum einen auf die Inhalte der Making-Aktivitäten selbst und zum anderen insbesondere auf die Didaktik und Methodik der Lernumgebung und Aktivitäten zurückzuführen sind.
description: Medienimpulse, Bd. 58 Nr. 4 (2020): 4/2020 – Making und Makerlabs
FORCAST imaging of two small nearby Clusters: The Coronet and B59
Creators: name: Sandell, G.
name: Reipurth, B.
name: Vacca, W. D.
name: Bajaj, N. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present mid infrared imaging of two young clusters, the Coronet in the CrA cloud core and B59 in the Pipe Nebula, using the FORCAST camera on the Stratospheric Observatory for Infrared Astronomy. We also analyze Herschel Space Observatory PACS and SPIRE images of the associated clouds. The two clusters are at similar, and very close, distances. Star formation is ongoing in the Coronet, which hosts at least one Class 0 source and several pre-stellar cores, which may collapse and form stars. The B59 cluster is older, although it still has a few Class I sources, and is less compact. The CrA cloud has a diameter of about 0.16 pc, and we determine a dust temperature of 15.7 K and a star formation efficiency of about 27 %, while the B59 core is approximately twice as large, has a dust temperature of about 11.4 K and a star formation efficiency of about 14 %. We infer that the gas densities are much higher in the Coronet, which has also formed intermediate mass stars, while B59 has only formed low-mass stars.
description: 15 pages, 6 figures, Accepted for publication in The Astrophysical Journal
The Struggle with Academic Plagiarism: Approaches based on Semantic Similarity
Creators: name: Vrbanec, Tedo
name: Mestrovic, Ana
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Academic plagiarism is a serious problem nowadays. Due to the existence of inexhaustible sources of digital information, today it is easier to plagiarize more than ever before. The good thing is that plagiarism detection techniques have improved and are powerful enough to detect attempts of plagiarism in education. We are now witnessing efficient plagiarism detection software in action, such as Turnitin, iThenticate or SafeAssign. In the introduction we explore software that is used within the Croatian academic community for plagiarism detection in universities and/or in scientific journals. The question is: is this enough? Current software has proven to be successful, however the problem of identifying paraphrasing or obfuscation plagiarism remains unresolved. In this paper we present a report of how semantic similarity measures can be used in the plagiarism detection task.
description: 6 pages, 1 figure, 34 references
Das Filmbild
Creators: name: Kumher, Ulrich
Publisher: name: Medienimpulse
Year: 2020

description: Der Beitrag fokussiert Filmbilder (1.) und gibt Hinweise bzgl. ihres Bildungspotenzials (2.). Es folgen konzeptionelle (3.) und methodische Überlegungen (4.). Schließlich werden einige der Überlegungen mithilfe von Beispielen belegt (5.) und weitere mediendidaktische Hinweise zum Thema runden den Beitrag ab (6.).
description: Medienimpulse, Bd. 58 Nr. 4 (2020): 4/2020 – Making und Makerlabs
Multiscale analysis of crystal defect formation in rapid solidification of pure aluminium and aluminium-copper alloys
Creators: name: Pinomaa, Tatu
name: Lindroos, Matti
name: Jreidini, Paul
name: Haapalehto, Matias
name: Ammar, Kais
name: Wang, Lei
name: Forest, Samuel
name: Provatas, Nikolas
name: Laukkanen, Anssi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Rapid solidification leads to unique microstructural features, where a less studied topic is the formation of various crystalline defects, including high dislocation densities, as well as gradients and splitting of the crystalline orientation. As these defects critically affect the material's mechanical properties and performance features, it is important to understand the defect formation mechanisms, and how they depend on the solidification conditions and alloying. To illuminate the formation mechanisms of the rapid solidification induced crystalline defects, we conduct a multiscale modeling analysis consisting of bond-order potential based molecular dynamics (MD), phase field crystal based amplitude expansion (PFC-AE) simulations, and sequentially coupled phase field -- crystal plasticity (PF--CP) simulations. The resulting dislocation densities are quantified and compared to past experiments. The atomistic approaches (MD, PFC) can be used to calibrate continuum level crystal plasticity models, and the framework adds mechanistic insights arising from the multiscale analysis.
In Heisei angekommen – eine Rezension zu Local political participation in Japan: A case study of Oita (Routledge, 2019)
Creators: name: Polak-Rottmann, Sebastian
Publisher: name: MINIKOMI: Austrian Journal of Japanese Studies
Year: 2020

description: In dieser Rezension wird Local political participation in Japan: A case study of Oita (2019) von Dani Daigle Kida 2019 besprochen. Dabei wird auf die beiden Stärken des Artikels eingegangen: (1) Triangulation qualitativer und quantitativer Methoden, (2) Konzentration auf den lokalen politischen Raum, der bisher nur wenig Aufmerksamkeit im Mainstream der politischen Partizipationsforschung erfahren hat. Im Zuge ihrer Feldforschung in Ōita liefert Kida wertvolle Erkenntnisse darüber, wie 'traditionelle' Partizipationsweisen bis heute existieren können, obwohl Parteienbindungen erodieren und Diskurse über ein stärkeres Einbinden von Bürger*innen in den politischen Prozess in Gesellschaft, Medien und wissenschaftlichen Kreisen spätestens seit der Heisei-Zeit geführt werden. Die Rezension endet mit dem Vorschlag, ein Konzept zu Partizipation zu verwenden, bei dem auch Tätigkeiten außerhalb des eng begriffenen politischen Raums berücksichtigt werden. Dadurch könnte eine Vielzahl an gesellschaftlich und letztlich auch politisch relevanten Aktivitäten im ländlichen Japan erfasst werden, die (zum Teil durchaus auch erfolgreiche) Versuche darstellen, die Gesellschaft oder lokale Entscheidungsfindungsprozesse zu beeinflussen.
description: MINIKOMI: Austrian Journal of Japanese Studies, Nr. 88 (2020): Schwerpunkt: Heisei
Discrete symmetries and the propagator approach to coupled fermions in Quantum Field Theory. Generalities. The case of a single fermion-antifermion pair
Creators: name: Duret, Quentin
name: Machet, Bruno
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Starting from Wigner's symmetry representation theorem, we give a general account of discrete symmetries (parity P, charge conjugation C, time-reversal T), focusing on fermions in Quantum Field Theory. We provide the rules of transformation of Weyl spinors, both at the classical level (grassmanian wave functions) and quantum level (operators). Making use of Wightman's definition of invariance, we outline ambiguities linked to the notion of classical fermionic Lagrangian. We then present the general constraints cast by these transformations and their products on the propagator of the simplest among coupled fermionic system, the one made with one fermion and its antifermion. Last, we put in correspondence the propagation of C eigenstates (Majorana fermions) and the criteria cast on their propagator by C and CP invariance.
description: 37 pages, LaTeX. version to appear in "Annals of Physics (N.Y.)"
Density Evolution in the New Modified Chaplygin Gas Model
Creators: name: Chattopadhyay, Surajit
name: Debnath, Ujjal
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we have considered new modified Chaplygin gas (NMCG) model which interpolates between radiation at early stage and $Λ$CDM at late stage. This model is regarded as a unification of dark energy and dark matter (with general form of matter). We have derived the density parameters from the equation of motion for the interaction between dark energy and dark matter. Also we have studied the evolution of the various components of density parameters.
description: 6 Latex pages, 4 figures, RevTex style
Normal automorphisms of relatively hyperbolic groups
Creators: name: Minasyan, A.
name: Osin, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F65, 20F67, 20E26

description: An automorphism $α$ of a group $G$ is normal if it fixes every normal subgroup of $G$ setwise. We give an algebraic description of normal automorphisms of relatively hyperbolic groups. In particular, we prove that for any relatively hyperbolic group $G$, $Inn(G)$ has finite index in the subgroup $Aut_n(G)$ of normal automorphisms. If, in addition, $G$ is non-elementary and has no non-trivial finite normal subgroups, then $Aut_n(G)=Inn(G)$. As an application, we show that $Out(G)$ is residually finite for every finitely generated residually finite group $G$ with more than one end.
description: Version 4: final (27 pages, 2 figures)
Detecting Pulsars with Neural Networks: A Proof of Concept
Creators: name: Künkel, Lars
name: Thomas, Rajat M.
name: Verbiest, Joris P. W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Pulsar searches are computationally demanding efforts to discover dispersed periodic signals in time- and frequency-resolved data from radio telescopes. The complexity and computational expense of simultaneously determining the frequency-dependent delay (dispersion) and the periodicity of the signal is further exacerbated by the presence of various types of radio-frequency interference (RFI) and observing-system effects. New observing systems with wider bandwidths, higher bit rates and greater overall sensitivity (also to RFI) further enhance these challenges. We present a novel approach to the analysis of pulsar search data. Specifically, we present a neural-network-based pipeline that efficiently suppresses a wide range of RFI signals and instrumental instabilities and furthermore corrects for (a priori unknown) interstellar dispersion. After initial training of the network, our analysis can be run in real time on a standard desktop computer with a commonly available, consumer-grade GPU. We complement our neural network with standard algorithms for periodicity searches. In particular with the Fast Fourier Transform (FFT) and the Fast Folding Algorithm (FFA) and demonstrate that with these straightforward extensions, our method is capable of identifying even faint pulsars, while maintaining an extremely low number of false positives. We furthermore apply our analysis to a subset of the PALFA survey and demonstrate that in most cases the automated dispersion removal of our network produces a time series of similar quality as dedispersing using the actual dispersion measure of the pulsar in question. On our test data we are able to make predictions whether a pulsar is present in the data or not 200 times faster than real time.
description: Accepted for publication in MNRAS. 17 pages, 16 figures
Acrolepiidae Heinemann 1870
Creators: name: Pohl, Greg
name: Anweiler, Gary
name: Schmidt, Christian
name: Kondla, Norbert
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Acrolepiidae

description: 20. Acrolepiidae – false diamondback moths Small (12–15 mm wingspan) moths with narrow lanceolate wings, usually with a conspicuous fringe on the tornal area of the forewing. This family is separated from similar yponomeutoid groups by details of the genitalia and venation. Larvae are leaftiers and skeletonizers or stem, bulb, and seed borers of Liliaceae and a number of dicot families. Approximately 95 species of Acrolepiidae are known globally, most in the Palaearctic. Eight species are known in North America; one is known in AB. Gaedike (1984) revised the family for North and South America. Landry (2007) reviewed the North American species of Acrolepiopsis. 119 * R Acrolepiopsis californica Gaedike, 1984 M Apr – L Jun; – B – T: Gaedike (1984, 1994), Landry (2007) Oct (H) L: Pohl et al. (2005), Landry (2007) C: CNC, NFRC
description: Published as part of Pohl, Greg, Anweiler, Gary, Schmidt, Christian & Kondla, Norbert, 2010, An annotated list of the Lepidoptera of Alberta, Canada, pp. 1-549 in ZooKeys 38 (38) on pages 64-65, DOI: 10.3897/zookeys.38.383, http://zenodo.org/record/576629
description: {"references": ["Gaedike R (1984) Revision der nearktischen und neotropischen Acrolepiidae (Lepidoptera) [Revision of the Nearctic and Neotropical Acrolepiidae (Lepidoptera)]. Entomologische Abhandlungen 47: 179 - 194.", "Landry J-F (2007) Taxonomic review of the leek moth genus Acrolepiopsis (Lepidoptera: Acrolepiidae) in North America. Th e Canadian Entomologist 139: 319 - 353.", "Gaedike R (1994) A new species of Acrolepiopsis and the description of the female of A. californica (Acrolepiidae). Journal of the Lepidopterists' Society 48: 46 - 50.", "Pohl GR, Bird CD, Landry J-F, Anweiler GG (2005) New records of microlepidoptera in Alberta, Canada. Journal of the Lepidopterists' Society 59: 61 - 82."]}
Patterns in high-frequency FX data: Discovery of 12 empirical scaling laws
Creators: name: Glattfelder, J. B.
name: Dupuis, A.
name: Olsen, R. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We have discovered 12 independent new empirical scaling laws in foreign exchange data-series that hold for close to three orders of magnitude and across 13 currency exchange rates. Our statistical analysis crucially depends on an event-based approach that measures the relationship between different types of events. The scaling laws give an accurate estimation of the length of the price-curve coastline, which turns out to be surprisingly long. The new laws substantially extend the catalogue of stylised facts and sharply constrain the space of possible theoretical explanations of the market mechanisms.
description: 26 pages, 3 figures, 23 tables,2nd version (text made more concise and readable, algorithm pseudocode, results unchanged), 5-year datasets (USD-JPY, EUR-USD) provided at http://www.olsen.ch/more/datasets/
Compressible Fluids: the discontinuity of the vorticity vector on a shock wave in thermodynamical variables
Creators: name: Gouin, Henri
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The discontinuity of the vorticity is written as a function of the vector T grad s, (where T is the temperature and s the specific entropy). The expression is obtained thanks to potential equations and independently of the mass conservation and the equation of momentum balance.
description: English translation of French version of C.R. Acad Sci. Paris, t. 276, A, p.p. 1377-1380
Accretion-disc model spectra for dwarf-nova stars
Creators: name: Idan, Irit
name: Lasota, Jean-Pierre
name: Hameury, Jean-Marie
name: Shaviv, Giora
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Radiation from accretion discs in cataclysmic variable stars (CVs) provides fundamental information about the properties of these close binary systems and about the physics of accretion in general. The detailed diagnostics of accretion disc structure can be achieved by including in its description all the relevant heating and cooling physical mechanism, in particular the convective energy transport that, although dominant at temperatures less than about 10 000 K, is usually not taken into account when calculating spectra of accretion discs. We constructed a radiative transfer code coupled with a code determining the disc's hydrostatic vertical structure. We have obtained for the first time model spectra of cold, convective accretion discs. As expected, these spectra are mostly flat in the optical wavelengths with no contribution from the UV, which in quiescence must be emitted by the white dwarf. The disc structures obtained with our radiative-transfer code compare well with the solutions of equations used to describe the dwarf-nova outburst cycle according to the thermal-viscous disc instability model thus allowing the two to be combined. Our code allows calculating the spectral evolution of dwarf nova stars through their whole outburst cycle, providing a new tool for testing models of accretion discs in cataclysmic variables. We show that convection plays an important role in determining the vertical disc structure and substantially affects emitted spectra when, as often the case, it is effective at optical depths tau ~ 1. The emergent spectrum is independent of the parameters of the convection model.(Abstract shortened)
description: Astronomy & Astrophysics in press. Deeply revised version. Corrected OP data taken into account. New figures (except for Figs. 1 & 2)
Can the Hagedorn Phase Transition be explained from Matrix Model for Strings?
Creators: name: Sathiapalan, B.
name: Sircar, Nilanjan
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The partition function of BFSS matrix model is studied for two different classical backgrounds upto 1-loop level. One of the backgrounds correspond to a membrane wrapped around a compact direction and another to a localized cluster of $D0$-branes. It is shown there exist phase transitions between these two configurations - but only in presence of an IR cut-off. The low temperature phase corresponds to a string (wrapped membrane) phase and so we call this the Hagedorn phase transition. While the presence of an IR cut-off seemingly is only required for perturbative analysis to be valid, the physical necessity of such a cut-off can be seen in the dual supergravity side. It has been argued from entropy considerations that a finite size horizon must develop even in an extremal configuration of D0-branes, from higher derivative $O(g_s)$ corrections to supergravity. It can then be shown that the Hagedorn like transition exists in supergravity also. Interestingly the perturbative analysis also shows a second phase transition back to a string phase. This is also reminiscent of the Gregory-Laflamme instability.
description: minor changes
Scale dependence of factors controlling the release of water from snow and ice storage
Creators: name: Braun, Ludwig Niklaus
Publisher: name: University of British Columbia
Year: 2010

description: A study of the scale dependence of the factors controlling the release of water from snow and ice storage was conducted during the ablation season 1978 in the watershed of Miller Creek, located in the Pacific Ranges of the Coast Mountains, B. C. The results of this investigation support distinct predictive relationships at an open site, a small-scale watershed (area 3.3 km²) consisting of a flat valley bottom and a forested south-facing slope, and a partly glacierized meso-scale watershed (area 23 km²) of complex topography. The role of snow storage in the small-scale watershed is complicated by the nature of the horizontal stratification. Slope was found to have a greater influence than vegetation density in determining the amount of snow storage. The vertical zonation of seasonal snow-cover is also complex in that there is a decrease with height up to 200 m from the valley bottom, and an increase of about 200 mm W.E. per 100 m above. Approximately 60% of the melt energy available at the Meadow site came from net radiation; of the remainder most is assumed to be advected sensible heat. Streamflow generation in the small-scale watershed was greatly influenced by the gradual release of water from poorly drained, swampy areas. At the Meadow site, the snow stratigraphy, the mean daily air temperature (as a surrogate variable for energy availability) and the vertical flow pathways through the snowpack were the dominant controls of water release at the base of the snowpack. Typical response times of the meltwater release were time lags of 1 to 4 hours between the peaks of net radiation and melt flux, and recession constants between two and ten hours. At the small watershed scale, vegetation cover, slope and elevation, topoclimatic unit distribution and horizontal as well as vertical flow pathways were the dominant controls of water release, as measured in a stream channel at the mouth of the watershed. Time lags between peak net radiation and peak streamflow changed through the melt season from 8 hours at the beginning to 3 hours at the end, while recession constants remained consistently high at 150-200 hours. At the meso-scale, the distribution of glacier ice, perennial and seasonal snowcover, and lake and channel storage complexities make the analysis of water release mechanisms via conventional hydrograph analysis impractical. Time lags varied greatly from 6 to 13 hours at the beginning of the melt season and became more steady during the summer, falling from about 10 hours to about 5 hours between late June and early September. Recession constants remained highly variable between 50 and about 200 hours through the whole melt season.
6. Forum für literaturwissenschaftliche Japanforschung
Creators: name: Kamerer, Tamara
name: Gmeinbauer, Christina
name: Hein, Ina
Publisher: name: MINIKOMI: Austrian Journal of Japanese Studies
Year: 2020

description: Ziemlich genau ein Jahr, nachdem das Forum zur literaturwissenschaftlichen Japanforschung an der Universität Trier stattgefunden hatte, wurde es von der Fachrichtung Japanologie des Instituts für Ostasienwissenshaften an der Universität Wien ausgerichtet. Sehr erfreulich war, dass es trotz der zeitliche Nähe zum Ende August in Berlin stattfindenden 17. Deutschsprachigen Japanologentag dennoch sehr viele Einreichungen gab und wir daher ein umfangreiches Programm zusammenstellen konnten. Bis auf wenige Ausnahmen waren fast alle japanologischen Standorte im deutschsprachigen Raum, an denen literaturwissenschaftlich gearbeitet wird, vertreten.
description: MINIKOMI: Austrian Journal of Japanese Studies, Nr. 88 (2020): Schwerpunkt: Heisei
Study of the Influence of an Evolving Galactic Potential on the Orbital Properties of 152 Globular clusters with Data from the Gaia EDR3 Catalogue
Creators: name: Bajkova, A. T.
name: Smirnov, A. A.
name: Bobylev, V. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have studied the influence of an evolving gravitational potential of the Milky Way Galaxy on the orbital motion of 152 globular clusters with proper motions from the Gaia EDR3 catalogue and mean distances from Baumgardt and Vasiliev (2021). To construct a semicosmological evolving model potential with changing masses and sizes of the Galactic components, we have used the algorithm described in Haghi et al. (2015). The adopted axisymmetric three-component model potential of the Galaxy includes a spherical bulge, a flat Miyamoto--Nagai disk, and a spherical Navarro--Frenk--White dark matter halo.The orbits are integrated backward in time. We compare the orbital parameters of globular clusters derived in static and evolving potentials when integrating the orbits for 5 and 12 Gyr backward. For the first time we have studied the influence of separately a change in the masses and a change in the sizes of the Galactic components. The changes in the masses and sizes of the components are shown to act on the orbital parameters in the opposite way. At small Galactocentric distances this influence is maximally compensated for. The orbits of distant globular clusters and those with a large apocenter distance undergo the biggest changes. We show that on time scales up to $-5$~Gyr the orbits of globular clusters in the case of a potential with both changing masses and changing sizes of the components undergo, on average, minor changes compared to the case of a static potential. These changes fit into the limits of the statistical uncertainties caused by the errors in the data. So, on these time scales the Galactic potential may be deemed static. We provide tables with the orbital parameters of globular clusters derived in both static and evolving potentials.
description: 21 pages, 10 figures, 3 tables
Nodal lines and boundary modes in topological Dirac semimetals with magnetism
Creators: name: Araki, Yasufumi
name: Watanabe, Jin
name: Nomura, Kentaro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Nodal-line semimetals with magnetic orders have been theoretically predicted and experimentally observed in only few compounds. We theoretically explore the electronic structure in bulk and boundary of such a magnetic nodal-line state by introducing magnetism in topological Dirac semimetal (TDSM). TDSMs, such as $\mathrm{Cd_3 As_2}$ and $\mathrm{Na_3 Bi}$, are characterized by a pair of spin-degenerate Dirac points protected by rotational symmetries of crystals. By introducing local magnetic moments coupled to the electron spins in the lattice model of TDSM, we show that the TDSM can turn into either a Weyl semimetal or a nodal-line semimetal, which is determined by the orbital dependence in the exchange coupling and the direction of magnetization formed by the magnetic moments. In this magnetic nodal-line semimetal state, we find zero modes with drumhead-like band structure at the boundary that are characterized by the topological number of $\mathbb{Z}$. Those zero modes are numerically demonstrated by introducing magnetic domain walls in the lattice model.
description: 9 pages, 7 figures
Motional dispersions and ratchet effect in inertial systems
Creators: name: Reenbohn, W. L.
name: Saikia, S.
name: Roy, R.
name: Mahato, Mangal C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We obtain ratchet effect in inertial structureless systems in symmetric periodic potentials where the asymmetry comes from the nonuniform friction offered by the medium and driven by symmetric periodic forces. In the adiabatic limit the calculations are done by extending the matrix continued fraction method and also by numerically solving the appropriate Langevin equation. For finite frequency field drive the ratchet effect is obtained only numerically. In the transient time scales the system shows dispersionless behaviour as reported earlier when a constant force is applied. In the periodic drive case the dispersion behaviour is more complex. In this brief communication we report some of the results of our work
description: 14 pages, 7figures
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Boucher, Christina
name: Rahmann, Sven
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2022
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization
subject: Applied computing → Bioinformatics
subject: Applied computing → Computational biology
subject: Theory of computation → Design and analysis of algorithms
subject: Mathematics of computing → Discrete mathematics
subject: Mathematics of computing → Information theory

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 242, 22nd International Workshop on Algorithms in Bioinformatics (WABI 2022), pages 0:i-0:xii
Improved ring potential of QED at finite temperature and in the presence of weak and strong magnetic field
Creators: name: Sadooghi, N.
name: Anaraki, K. Sohrabi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the general structure of the vacuum polarization tensor $Π_{μν}(k_{0},\mathbf{k})$ in the infrared (IR) limit, $k_{0}\to 0$, the ring contribution to QED effective potential at finite temperature and non-zero magnetic field is determined beyond the static limit, $(k_{0}\to 0,\mathbf{k}\to \mathbf{0})$. The resulting ring potential is then studied in weak and strong magnetic field limit. In the limit of weak magnetic field, at high temperature and for $α\to 0$, the improved ring potential consists of a term proportional to $T^{4}α^{5/2}$, in addition to the expected $T^{4}α^{3/2}$ term arising from the static limit. Here, $α$ is the fine structure constant. In the limit of strong magnetic field, where QED dynamics is dominated by the lowest Landau level (LLL), the ring potential includes a novel term consisting of dilogarithmic function $(eB){Li}_{2}(-\frac{2α}π\frac{eB}{m^{2}})$. Using the ring improved (one-loop) effective potential including the one-loop effective potential and ring potential in the IR limit, the dynamical chiral symmetry breaking of QED is studied at finite temperature and in the presence of strong magnetic field. The gap equation, the dynamical mass and the critical temperature of QED in the regime of LLL dominance are determined in the improved IR as well as in the static limit. For a given value of magnetic field, the improved ring potential is shown to be more efficient in decreasing the critical temperature arising from one-loop effective potential.
description: V1: 39 pages, 2 figures, 2 tables, LaTeX format; V2: 53 pages, 3 figures, 1 table, Sect. IV revised, results are unchanged, 3 appendices and references added, version accepted for publication in Phys. Rev. D
Magnetic bottles on geometrically finite hyperbolic surfaces
Creators: name: Morame, Abderemane
name: Truc, Francoise
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider a magnetic Laplacian on a geometrically finite hyperbolic surface, when the corresponding magnetic field is infinite at the boundary at infinity. We prove that the counting function of the eigenvalues has a particular asymptotic behaviour when the surface has an infinite area.
Periodic activity from fast radio burst FRB180916 explained in the frameof the orbiting asteroid model
Creators: name: Voisin, Guillaume
name: Mottez, Fabrice
name: Zarka, Philippe
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Observation of fast radio bursts (FRBs) are rising very quickly with the advent of specialised instruments and surveys, and it has recently been shown that some of them repeat quasi-periodically. In particular, evidence of a $P=16.35$ day period has been reported for FRB 180916.J0158+65. We seek an explanation within the frame of our orbiting asteroid model, whereby FRBs are produced in the plasma wake of asteroids immersed in the wind of a pulsar or a magnetar. We used the data reported by the CHIME/FRB collaboration in order to infer the orbital characteristics of asteroid swarms, and performed parametric studies to explore the possible characteristics of the pulsar, its wind, and of the asteroids, under the constraint that the latter remain dynamically and thermally stable. We found a plausible configuration in which a young pulsar is orbited by a main $\sim 10^{-3}M_\odot$ companion with a period $3P = 49$d, three times longer than the apparent periodicity $P$. Asteroids responsible for FRBs are located in three dynamical swarms near the L3, L4 and L5 Lagrange points, in a 2:3 orbital resonance akin to the Hildas class of asteroids in the Solar system. In addition, asteroids could be present in the Trojan swarms at the L4 and L5 Lagrange points. Together these swarms form a carousel that explains the apparent $P$ periodicity and dispersion. We estimated that the presence of at least a few thousand asteroids, of size $\sim20$km, is necessary to produce the observed burst rate. We show how radius-to-frequency mapping in the wind and small perturbations by turbulence can suffice to explain downward-drifting sub-pulses, micro-structures, and narrow spectral occupancy.
description: Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, 2021
Emil Brix und Patrick Werkner, Hg., Die Wiener Moderne. Ergebnisse eines Forschungsgespräches der Arbeitsgemeinschaft Wien um 1900 zum Thema „Aktualität und Moderne", Wien u. München: Geschichte u. Politik, Oldenbourg 1990.
Creators: name: Le Rider, Jacques
Publisher: name: Österreichische Zeitschrift für Geschichtswissenschaften
Year: 1991

description: Österreichische Zeitschrift für Geschichtswissenschaften, Bd. 2 Nr. 4 (1991): Orte der Erinnerung
David Warren Sabean: Property, production, and family in Neckarhausen, 1700-1870 (Cambridge studies in social and cultural anthropology 37), Cambridge University Press 1990.
Creators: name: Becker, Peter
Publisher: name: Österreichische Zeitschrift für Geschichtswissenschaften
Year: 1991

description: Österreichische Zeitschrift für Geschichtswissenschaften, Bd. 2 Nr. 4 (1991): Orte der Erinnerung
PHYTOCHEMICAL SCREENING AND EVALUATION OF ANTIULCER ACTIVITY OF ALCOHOLIC EXTRACT OF HEMIDESMUS INDICUS LEAVES
Creators: name: Rangapur Niharika* , Y. Sridhar
Publisher: name: Zenodo
Year: 2023

description: The cause of ulceration in patients is mainly due to hyper secretion of gastric juice and also due to hyper secretion of pepsin. In traditional system of medicine a number of herbal preparations have been used for the treatment of peptic ulcers. There are various medicinal plants has been used for the treatment of gastrointestinal disorders. In view of this, in present study we have to evaluate the anti-ulcer activity of Hemidesmus Indicus. Study was carried out, by using three methods i.e., alcohol, paracetamol and stress induced ulcers in rats pretreated with the doses of 250 mg/kg ALHI, 10mg/kg Omeoprazole and 50 mg/kg Ranitidine.

To evaluate the antiulcer activity of aqueous and Methanolic extracts of Hemidesmus Indicus leaves (ALHI) at 250 doses using different experimentally induced gastric ulcer models in rats.

Gastric ulcers were induced in rats by 80% alcohol, paracetamol and forced immersion stress induced methods. In alcohol induced ulcer model, paracetamol induced ulcer model and stress induced model the ulcer index was determined. Where as in stress induced ulcers stress plays an important role in ulcerogenesis.

 In alcohol-induced ulcers, ALHI were effective in reducing lesion index and increasing the gastric mucus content. It was also effective in decreasing ulcer index in paracetamol-induced ulcers. All the results obtained with Hemidesmus Indicus were dose dependent.  The results suggest that ALHI possesses significant and dose dependent antiulcer activity. The antiulcer activity of ALHI can be attributed to its cytoprotective and antisecretory action.

Key words: Hemidesmus Indicus, antisecretory, cytoprotective, gastric ulcer, alcohol induced ulcers, paracetamol-induced ulcers and stress induced ulcers.
A Fast Way to Compute Functional Determinants of Radially Symmetric Partial Differential Operators in General Dimensions
Creators: name: Hur, Jin
name: Min, Hyunsoo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently the partial wave cutoff method was developed as a new calculational scheme for a functional determinant of quantum field theory in radial backgrounds. For the contribution given by an infinite sum of large partial waves, we derive explicitly radial WKB series in the angular momentum cutoff for $d=2,3,4$ and 5 ($d$ is the spacetime dimension), which has uniform validity irrespectively of any specific values assumed for other parameters. Utilizing this series, precision evaluation of the renormalized functional determinant is possible with a relatively small number of low partial wave contributions determined separately. We illustrate the power of this scheme in numerically exact evaluation of the prefactor (expressed as a functional determinant) in the case of the false vacuum decay of 4D scalar field theory.
description: 28 pages, 2 figures
K* production in Cu+Cu and Au+Au collisions at sqrt(s_{NN}) = 62.4 GeV and 200 GeV in STAR
Creators: name: Dash, Sadhana
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report the measurements of $p_T$ spectra of $K^*$ up to intermediate $p_T$ region in mid-rapidity through its hadronic decay channel using the STAR detector in Au+Au and Cu+Cu collisions at $\sqrt{s_{\mathrm{NN}}}$= 62.4 GeV and 200 GeV. Particle ratios such as $K^{*}/K$ and $K^{*}/ϕ$ is used to understand the rescattering and regeneration effect on $K^{*}$ production in the hadronic medium. The $K^*$ $v_{2}$ measurement using a high statistics Au+Au 200 GeV dataset and nuclear modification factor measurement supports the quark coalescence model of particle production in the intermediate $p_T$ range.
description: 5 pages