cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dissipation and Heating in Supersonic Hydrodynamic and MHD Turbulence
Creators: name: Lemaster, M. Nicole
name: Stone, James M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study energy dissipation and heating by supersonic MHD turbulence in molecular clouds using Athena, a new higher-order Godunov code. We analyze the dependence of the saturation amplitude, energy dissipation characteristics, power spectra, sonic scaling, and indicators of intermittency in the turbulence on factors such as the magnetic field strength, driving scale, energy injection rate, and numerical resolution. While convergence in the energies is reached at moderate resolutions, we find that the power spectra require much higher resolutions that are difficult to obtain. In a 1024^3 hydro run, we find a power law relationship between the velocity dispersion and the spatial scale on which it is measured, while for an MHD run at the same resolution we find no such power law. The time-variability and temperature intermittency in the turbulence both show a dependence on the driving scale, indicating that numerically driving turbulence by an arbitrary mechanism may not allow a realistic representation of these properties. We also note similar features in the power spectrum of the compressive component of velocity for supersonic MHD turbulence as in the velocity spectrum of an initially-spherical MHD blast wave, implying that the power law form does not rule out shocks, rather than a turbulent cascade, playing a significant role in the regulation of energy transfer between spatial scales.
description: 17 pages, 21 figures, accepted to ApJ
The self concept of hearing impaired pupils in different educational settings in British Columbia : a preliminary investigation
Creators: name: McLaughlin, Joseph Robert
Publisher: name: University of British Columbia
Year: 2010

description: The professional field of the education of hearing impaired children has been inundated by controversy for the past century. The basic area of conflict has been between those advocating education in residential schools and those advocating education in day schools and classes. This leads to the question regarding the type of educational setting which would have the greatest impact on the development of self-concept. The purpose of this study was to investigate the influence of four different educational settings on the self-concept of hearing impaired pupils in British Columbia. The responses of a random sample of fifty-seven hearing impaired students and the responses of twenty-three teachers indicated no statistically significant difference in ranked scores on the Coopersmith Self-Esteem Inventory or the McDaniel Self-Concept Scale using a nonparametric ANOVA at the alpha=.05 level. However, there was statistical significance in the correlation between the scores from the Coopersmith and McDaniel. This finding appears to be a function of the restricted or inappropriate interpretations made by the deaf respondents to some of the words in the Coopersmith Self-Esteem Inventory. Consequently, low scores on the test may have represented limitations of understanding of the test items rather than a measure of self-concept as a personality component. In conclusion, this study shows evidence that there appears to be no statistically significant difference between the development of the self-concept of the deaf and the types of educational setting in which a student spends twelve years or more of his early life.
Förderung von Medienkritikfähigkeit im Kontext zeitgenössischer Propaganda
Creators: name: Seyferth-Zapf, Christian
name: Grafe, Silke
Publisher: name: Medienimpulse
Year: 2019

description: Der vorliegende Beitrag beschreibt die praxis- und theorieorientierte Entwicklung und Evaluation eines medienpädagogischen Unterrichtskonzepts für die Sekundarstufe I zur Förderung der Medienkritikfähigkeit im Kontext zeitgenössischer Propaganda. Auf der Basis einer Analyse theoretischer und empirischer Grundlagen zum Propagandabegriff und zur Medienkritikfähigkeit und unter besonderer Berücksichtigung des Ansatzes einer handlungs- und entwicklungsorientierten Didaktik wird ein medienpädagogisches Unterrichtskonzept entwickelt. Ausgehend von einem weitgefassten Propagandabegriff sind im Rahmen des Unterrichtskonzepts der Vergleich und die kritische Beurteilung unterschiedlicher Formen aktueller und historischer Propaganda sowie die Gestaltung eigener Medienbeiträge in Form von „Counter Narratives“ bedeutsame Vorgehensweisen. Die quasi-experimentelle Evaluation des Unterrichtskonzepts in der Sekundarstufe I eines Gymnasiums ist als „mixed-methods-design“ konzipiert und bestätigt die Wirksamkeit der Intervention in Bezug auf die Förderung der Medienkritikfähigkeit.
description: Medienimpulse, Bd. 57 Nr. 3 (2019): 3/2019 - Propaganda, Manipulation und "Fake News"
Transdisziplinarität : Wie die Kooperation von Wissenschaft und Praxisakteuren in Reallaboren soziale Innovationen in der Stadt fördert
Creators: name: Ober, Susanne
name: Szaguhn, Markus
name: Fricke, Annika
Publisher: name: Technische Universität Wien Academic Press (TU Wien)
Year: 2024
Subjects: Nachhaltige Stadtentwicklung
Soziale Innovation
Klimaneutrale Stadt
Transformation

description: Städte stehen durch eine Vielzahl an Herausforderungen unter Zugzwang. Besonders herausfordernd ist es, tragfähige Lösungen für die Stadtgesellschaft zu entwickeln, die mit Nachhaltigkeitszielen auf nationaler oder globaler Ebene einhergehen. Diesbezüglich rückt das Konzept der sozialen Innovation verstärkt in den Fokus. Dieser Artikel skizziert, wie Transdisziplinarität bzw. transdisziplinäre Prozesse soziale Innovationen fördern können, indem Wissenschaftler*innen und Praxisakteure gemeinsam realweltliche Probleme adressieren und das Potenzial beider Welten nutzen. Eine besondere Rolle spielen hierbei Reallabore, die als stabile Infrastruktur die Entwicklung von Quartieren oder Städten langfristig unterstützen. Wie transdisziplinäre und transformative Projekte im Reallabor soziale Innovationen praktizieren und ermöglichen können, wird u. a. anhand des Beispiels Klimafreundliche Kantinen illustriert.
Sim-to-Real Transfer in Multi-agent Reinforcement Networking for Federated Edge Computing
Creators: name: Pinyoanuntapong, Pinyarash
name: Pothuneedi, Tagore
name: Balakrishnan, Ravikumar
name: Lee, Minwoo
name: Chen, Chen
name: Wang, Pu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Federated Learning (FL) over wireless multi-hop edge computing networks, i.e., multi-hop FL, is a cost-effective distributed on-device deep learning paradigm. This paper presents FedEdge simulator, a high-fidelity Linux-based simulator, which enables fast prototyping, sim-to-real code, and knowledge transfer for multi-hop FL systems. FedEdge simulator is built on top of the hardware-oriented FedEdge experimental framework with a new extension of the realistic physical layer emulator. This emulator exploits trace-based channel modeling and dynamic link scheduling to minimize the reality gap between the simulator and the physical testbed. Our initial experiments demonstrate the high fidelity of the FedEdge simulator and its superior performance on sim-to-real knowledge transfer in reinforcement learning-optimized multi-hop FL.
description: 5 pages
Die Krise des Spätmittelalters und der Beginn der Moderne im Königreich Böhmen
Creators: name: Libal, Viktor
Year: 2010

description: A lot of changes in society could be observed at the end of the late Middle-ages in Europe. The Catholic Church was faced with many problems and challenges. The Czech reformer Jan Hus protested against these developments. After short time, Hus had found thousands of supporters in his home region Bohemia. Moreover the combination of this movement, Prague as important centre of science, culture and trade, the urbanisation process and the Czech National consciousness made Bohemia to a modern region. In the 16th and 17th the conflicts between Catholics and Protestants got worse. Consequently, the economic situation also worsened in most European countries. The witch phenomenon became popular due to these developments. This book is an attempt to discuss why the witch hunt in Bohemia did not exceed the same dimension as in other central European parts.
description: Die Krise des Spätmittelalters und der frühen Moderne war von vielen Veränderungen in der Gesellschaftsordnung gekennzeichnet. Die katholische Amtskirche hatte zusehends mit Kritik innerhalb ihrer Glaubensgemeinschaft zu kämpfen. Darüber hinaus konnten verschiedene Flügel an Einfluss und Macht gewinnen, was zu dem Schisma im 14. Jahrhundert führte. Jan Hus protestierte gegen alle diese Entwicklungen und konnte durch seine Reformversuche in Böhmen eine große Anhängerschaft gewinnen. Die Kombination aus dieser ersten europäischen Reformation, Prag als wissenschaftliches und kulturelles Zentrum, der einsetzenden Urbanisierung und das steigende tschechische Nationalbewusstsein machte die böhmische Region zu einem modernen Gebiet der damaligen Zeit. Aufgrund der immer heftiger werdenden Glaubenskonflikte verschärften sich die Spannungen zwischen Katholiken und Protestanten immer größer. In diesen krisenreichen Zeiten wurde das Hexenphänomen (sowohl von Katholiken und Protestanten) propagiert, um Sündenböcke für Fehlentwicklungen verantwortlich zu machen. Diese Diplomarbeit bietet Erklärungsversuche an, warum sich die Hexenprozesse in der böhmischen Region nicht durchsetzen konnten.
Evaluation of counsellor training in Gestalt methods
Creators: name: Sarkissian, Margaret Greig
Publisher: name: University of British Columbia
Year: 2010

description: This study evaluated the effectiveness of a Gestalt training group designed to train counsellors in the influencing skills of Gestalt therapy. The study involved eleven experimental group counsellors, a matched control group and four coached clients. A pre-test post-test research design was used. Counsellors in both groups were tested for similarity at pre-treatment levels. The dependent variables being examined were counsellor response to a split: actual use of the influencing skills of direct guidance, open question and non-verbal referent: intended use of the influencing skills of direct guidance, open question and non-verbal referent; and degree of personal growth goal attainment. Post-test measures were used as an indication of the effectiveness of the treatment. In the pre-test, each counsellor had a counselling session with a client coached to present a conflict split. The Wilcoxon Matched-Pairs Signed Ranks test of significance was used to analyze the counsellor response to a split and intended use of influencing skills. The dependent t-test was used to measure actual use of influencing skills. At the end of the training experience a Chi square test of independence was used to compare both groups on their degree of personal growth goal attainment. A Chi square goodness of fit was used to measure the experimental group on their degree of training goal attainment. Results indicated that the experimental group counsellors responded to a split with the Gestalt two-chair operation significantly more than did the control group. The experimental group used significantly more of the influencing skills of direct guidance and open question. In addition, they reported that they intended to use non-verbal referent significantly more than the control group. In the degree of attainment of personal growth goals the two groups were not shown to be different. The experimental group was found to have achieved their training goals. In summary, it appears that this Gestalt training group was successful in training counsellors in influencing skills.
Spin dynamics in point contacts to single ferromagnetic films
Creators: name: Balkashin, O. P.
name: Fisun, V. V.
name: Yanson, I. K.
name: Triputen, L. Yu.
name: Konovalenko, A.
name: Korenivski, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Excitation of magnons or spin-waves driven by nominally unpolarized transport currents in point contacts of normal and ferromagnetic metals is probed by irradiating the contacts with microwaves. Two characteristic dynamic effects are observed: a rectification of off-resonance microwave current by spin-wave nonlinearities in the point contact conductance, and a resonant stimulation of spin-wave modes in the nano-contact core by the microwave field. These observations provide a direct evidence that the magnetoconductance effects observed are due to GHz spin dynamics at the ferromagnetic interface driven by the spin transfer torque effect of the transport current.
SIDIS Asymmetries in Quark-Diquark Model
Creators: name: Kotzinian, Aram
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Some properties of intrinsic transverse momentum dependent nucleon distribution functions are considered in the simple quark-diquark model. The transverse target polarization dependent asymmetries for SIDIS are calculated and compared with recent results of COMPASS. The model describes well the measured asymmetries. Generalization of quark-diquark model for Sivers function is discussed.
description: to appear in proceedings of Transversity 2008 Workshop, May 28-31 2008, Ferrara (Italy). In V2 Fig. 1. is corrected
Off-nuclear AGN as a signature of recoiling massive black holes
Creators: name: Volonteri, M.
name: Madau, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: During the final phases of inspiral, a massive black hole (MBH) binary experiences a recoil due to the asymmetric emission of gravitational waves. We use recent results from numerical relativity simulations together with models of the assembly and growth of MBHs in hierarchical cosmologies, to study the dynamics, statistics, and observability of recoling MBHs. We find that, at redshift z<3, kicked non-rotating holes are typically found between 1 and 30 kpc from their galaxy centers, while rapidly rotating ones are typically between 10 and a few hundred kpc. A recoiling hole that carries an accretion disk may shine as an "off-nuclear AGN" while it moves away from the center of its host galaxy. We predict that, depending on the hole spin distribution and the duration of their active phase, a population of off-nuclear AGN may already be detectable at low and intermediate redshifts in present deep Hubble Space Telescope observations. The James Webb Space Telescope may discover tens of wandering AGN per square degree, most of them moving within their host halos on unbound trajectories.
description: ApJ letters in press
Reduction of velocity fluctuations in a turbulent flow of gallium by an external magnetic field
Creators: name: Berhanu, Michael
name: Gallet, Basile
name: Mordant, Nicolas
name: Fauve, Stephan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The magnetic field of planets or stars is generated by the motion of a conducting fluid through a dynamo instability. The saturation of the magnetic field occurs through the reaction of the Lorentz force on the flow. In relation to this phenomenon, we study the effect of a magnetic field on a turbulent flow of liquid Gallium. The measurement of electric potential differences provides a signal related to the local velocity fluctuations. We observe a reduction of velocity fluctuations at all frequencies in the spectrum when the magnetic field is increased.
description: accepted for Physical Review E
Prediction of high-Tc superconductivity in ternary lanthanum borohydrides
Creators: name: Liang, Xiaowei
name: Bergara, Aitor
name: Wei, Xudong
name: Wang, Linyan
name: Sun, Rongxin
name: Liu, Hanyu
name: Hemley, Russell J.
name: Wang, Lin
name: Gao, Guoying
name: Tian, Yongjun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The study of superconductivity in compressed hydrides is of great interest due to measurements of high critical temperatures (Tc) in the vicinity of room temperature, beginning with the observations of LaH10 at 170-190 GPa. However, the pressures required for synthesis of these high Tc superconducting hydrides currently remain extremely high. Here we show the investigation of crystal structures and superconductivity in the La-B-H system under pressure with particle-swarm intelligence structure searches methods in combination with first-principles calculations. Structures with six stoichiometries, LaBH, LaBH3, LaBH4, LaBH6, LaBH7 and LaBH8, were predicted to become stable under pressure. Remarkably, the hydrogen atoms in LaBH8 were found to bond with B atoms in a manner that is similar to that in H3S. Lattice dynamics calculations indicate that LaBH7 and LaBH8 become dynamically stable at pressures as low as 109.2 and 48.3 GPa, respectively. Moreover, the two phases were predicted to be superconducting with a critical temperature (Tc) of 93 K and 156 K at 110 GPa and 55 GPa, respectively. Our results provide guidance for future experiments targeting new hydride superconductors with both low synthesis pressures and high Tc.
description: 16 pages, 5 figures,
Squarks and gluinos at a TeV e+e- collider: Testing the identity of Yukawa and gauge couplings in SUSY-QCD
Creators: name: Brandenburg, A.
name: Maniatis, M.
name: Weber, M. M.
name: Zerwas, Peter M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Supersymmetry predicts the identity of Yukawa and gauge couplings in the QCD sector: quark-squark-gluino = squark-squark-gluon = quark-quark-gluon. We examine whether the quark-squark-gluino Yukawa coupling can be determined, by methods complementary to LHC, by analyzing squark-gluino final states at a TeV e+e- collider.
description: 14 pages, 13 figures
Cosmology With Many Light Scalar Fields: Stochastic Inflation and Loop Corrections
Creators: name: Adshead, Peter
name: Easther, Richard
name: Lim, Eugene A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We explore the consequences of the existence of a very large number of light scalar degrees of freedom in the early universe. We distinguish between participator and spectator fields. The former have a small mass, and can contribute to the inflationary dynamics; the latter are either strictly massless or have a negligible VEV. In N-flation and generic assisted inflation scenarios, inflation is a co-operative phenomenon driven by N participator fields, none of which could drive inflation on their own. We review upper bounds on N, as a function of the inflationary Hubble scale H. We then consider stochastic and eternal inflation in models with N participator fields showing that individual fields may evolve stochastically while the whole ensemble behaves deterministically, and that a wide range of eternal inflationary scenarios are possible in this regime. We then compute one-loop quantum corrections to the inflationary power spectrum. These are largest with N spectator fields and a single participator field, and the resulting bound on N is always weaker than those obtained in other ways. We find that loop corrections to the N-flation power spectrum do not scale with N, and thus place no upper bound on the number of participator fields. This result also implies that, at least to leading order, the theory behaves like a composite single scalar field. In order to perform this calculation, we address a number of issues associated with loop calculations in the Schwinger-Keldysh "in-in" formalism.
description: Typos corrected. Matches published version
Renormalization of the S Parameter in Holographic Models of Electroweak Symmetry Breaking
Creators: name: Burdman, Gustavo
name: Da Rold, Leandro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the S parameter is not finite in theories of electroweak symmetry breaking in a slice of anti--de Sitter five-dimensional space, with the light fermions localized in the ultraviolet. We compute the one-loop contributions to S from the Higgs sector and show that they are logarithmically dependent on the cutoff of the theory. We discuss the renormalization of S, as well as the implications for bounds from electroweak precision measurements on these models. We argue that, although in principle the choice of renormalization condition could eliminate the S parameter constraint, a more consistent condition would still result in a large and positive S. On the other hand, we show that the dependence on the Higgs mass in S can be entirely eliminated by the renormalization procedure, making it impossible in these theories to extract a Higgs mass bound from electroweak precision constraints.
description: Added comment on gauge invariance, added references, typos removed. Version to appear in JHEP
Prospects for CDM sub-halo detection using high angular resolution observations
Creators: name: Riehm, T.
name: Zackrisson, E.
name: Moeller, O.
name: Mortsell, E.
name: Wiik, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the CDM scenario, dark matter halos are assembled hierarchically from smaller subunits. A long-standing problem with this picture is that the number of sub-halos predicted by CDM simulations is orders of magnitudes higher than the known number of satellite galaxies in the vicinity of the Milky Way. A plausible way out of this problem could be that the majority of these sub-halos somehow have so far evaded detection. If such "dark galaxies" do indeed exist, gravitational lensing may offer one of the most promising ways to detect them. Dark matter sub-halos in the 1e6 - 1e10 solar mass range should cause strong gravitational lensing on (sub)milliarcsecond scales. We study the feasibility of a strong lensing detection of dark sub-halos by deriving the image separations expected for density profiles favoured by recent simulations and comparing these to the angular resolution of both existing and upcoming observational facilities. We find that there is a reasonable probability to detect sub-halo lensing effects in high resolution observations at radio wavelengths, such as produced by the upcoming VSOP-2 satellite, and thereby test the existence of dark galaxies.
description: 9 pages, 5 figures, Proceedings for "The Universe under the Microscope" (AHAR 2008), held in Bad Honnef (Germany) in April 2008, to be published in Journal of Physics: Conference Series by Institute of Physics Publishing, R. Schoedel, A. Eckart, S. Pfalzner, and E. Ros (eds.)
HOORCH - das HÖR-SPIEL
Creators: name: Berger, Christian
Publisher: name: Medienimpulse
Year: 2019

description: Der Beitrag von Christian Berger stellt einen Erfahrungsbericht über ein Entwicklungsprojekt am Zentrum für Lerntechnologie und Innovation an der Pädagogischen Hochschule Wien dar und bietet so ganz konkrete Einblicke in die Unterrichtspraxis ...
description: Medienimpulse, Bd. 57 Nr. 2 (2019): 2/2019 - Freies Heft
Rezension: Gloaming
Creators: name: Ballhausen, Thomas
Publisher: name: Medienimpulse
Year: 2019

description: Der Band „Gloaming“ des britischen Musikers und Autors Keaton Henson lässt inmitten urbaner Wirklichkeiten eine Geisterwelt auftauchen. Thomas Ballhausen hat den Band für die MEDIENIMPULSE rezensiert.
description: Medienimpulse, Bd. 57 Nr. 2 (2019): 2/2019 - Freies Heft
Confidence bands for exponential distribution functions under progressive type-II censoring
Creators: name: Bedbur, Stefan
name: Mies, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistics Theory (math.ST)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Based on a progressively type-II censored sample from the exponential distribution with unknown location and scale parameter, confidence bands are proposed for the underlying distribution function by using confidence regions for the parameters and Kolmogorov-Smirnov type statistics. Simple explicit representations for the boundaries and for the coverage probabilities of the confidence bands are analytically derived, and the performance of the bands is compared in terms of band width and area by means of a data example. As a by-product, a novel confidence region for the location-scale parameter is obtained. Extensions of the results to related models for ordered data, such as sequential order statistics, as well as to other underlying location-scale families of distributions are discussed.
description: AOM. This article has been accepted for publication in Journal of Statistical Computation and Simulation, published by Taylor & Francis
Estimate of the branching fraction $τ^- \to ηπ^-ν_τ$, the $a_0^-(980)$, and non-standard weak interactions
Creators: name: Nussinov, Shmuel
name: Soffer, Abner
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the ``second-class current'' decay $τ^-\toπ^-ην_τ$ from several points of view. We first focus on the decay rate as expected within standard weak interaction and QCD due to isospin violation. The decay contributions divide into $P$- and $S$-wave parts. The former can be reliably estimated using the $ρηπ$ coupling inferred from the rates and Dalitz-plot distributions of $η\to 3π$ decays. The somewhat larger $S$-wave part, which was previously computed using chiral perturbation theory, is estimated from a simple $\bar qq$ model. Both estimates of the $S$-wave part depend on whether the $a_0(980)$ scalar particle is a $\bar qq$ or some other (4-quark) state. Finally, we discuss genuinely new, non-$V-A$ scalar weak interactions. The $τ^-\toπ^-ην_τ$ decay provides information on this question, which nicely complements that from precision $β$ decay experiments. % In summary, we discuss the possible implications of putative values of the branching fraction ${\cal B}(τ^-\toπ^-ην_τ)$. In the case of larger values, in particular of the $S$-wave part, not only will detection of the decay be more likely and more reliable, its implications will be more far-reaching and interesting.
description: 13 pages
Donor-donor interaction mediated by cavity-photons and its relation to interactions mediated by excitons and polaritons
Creators: name: Quinteiro, G. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: I report theoretical predictions of two models of donor-donor indirect interaction mediated by photons in zero- and two-dimensional cavities. These results are compared to previously studied cases of indirect interactions mediated by excitons and/or polaritons in bulk semiconductor and two-dimensional cavities. I find that photons mediate an Ising-like interaction between donors in the same manner polaritons do, in contrast to the Heisenberg-like interaction mediated by exciton. For the particular case of a two-dimensional cavity, the model shows that the dependence on distance of the donor-donor coupling constant is the same for photons and polaritons when the donor-donor distance is large. Then, it becomes clear that photons are responsible for the long range behavior of the polariton indirect interaction.
On generating sets of infinite symmetric group
Creators: name: Semenov, Andrei V.
name: Denisova, Aleksandra
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 20B07, 20F99

description: It was shown that in a group of bijections of an infinite set some families of subsets, related to the cardinality of some eigenspaces, are generating. Besides, we derived a criterion for generating by sets of this kind.
description: 7 pages
Rezension: Feminismus revisited
Creators: name: Burger, Bianca
Publisher: name: Medienimpulse
Year: 2019

description: Erica Fischer beschäftigt sich in „Feminismus revisited“ mit der Frage, inwieweit die in den 1970er-Jahren geführten feministischen Kämpfe noch heute Relevanz haben und weiter ausgefochten werden, was sich seit dem verändert hat und wo es Anknüpfungspunkte zwischen heutigen und damaligen feministischen Debatten gibt.
description: Medienimpulse, Bd. 57 Nr. 2 (2019): 2/2019 - Freies Heft
Rezension: Der Tyrann. Shakespeares Machtkunde für das 21. Jahrhundert
Creators: name: Nagy, Simon
Publisher: name: Medienimpulse
Year: 2019

description: Den gegenwärtigen Siegeszug autoritärer Politik sucht Stephen Greenblatt in den Dramen Shakespeares zu ergründen. Er untersucht den Aufstieg, die Politik und den Fall ihrer tyrannischen Figuren, um das Verständnis für die Dynamiken des Despotischen auf eine Weise zu schärfen, die auch heute von Nutzen sein kann.
description: Medienimpulse, Bd. 57 Nr. 2 (2019): 2/2019 - Freies Heft
Correlating shale geochemistry with metal sorption: influence of kaolinite content
Creators: name: Sirvi, Rahul
name: Parab, Harshala
name: Sengupta, Pranesh
name: Kumar, Sangita D.
name: Ramanjaneyulu, P.S.
name: Bhui, Uttam K.
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Space Science
subject: Physical Sciences not elsewhere classified
subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Argillaceous rocks constituting clay fractions are potential host rock candidates for isolation of radioactive waste in underground repositories. The present study aims at characterization of two argillaceous rocks (shales) from different geological settings (surface and subsurface localities) and investigation of their cesium (Cs) sorption behaviour. The shales were characterized using various analytical techniques to evaluate the textural attributes, mineralogical constituents and surface properties. The major mineralogical constituent of the surface and subsurface shale was quartz (62%) and kaolinite (56%), respectively. The abundance of smectite and illite in both the shales was comparable. Fluorescence and UV-Vis spectra confirmed the presence of polyaromatic hydrocarbons (PAHs) in the subsurface shale. The subsurface shale demonstrated higher Cs retention (17 mg g−1) than the surface shale (12 mg g−1) due to higher kaolinite content. Surface analysis of the shale samples revealed involvement of ion exchange mechanism in Cs uptake. The agreement of experimental results with Freundlich sorption isotherm suggests the heterogenous nature of the shales with multiple sorption sites. The correlation of geochemistry (especially the kaolinite content) for both the shales with Cs sorption is clearly highlighted in the present studies. The present investigation implies the applicability of the studied shales for waste management applications.
Properties of the Youngest Protostars in Perseus, Serpens, and Ophiuchus
Creators: name: Enoch, Melissa L.
name: Evans, Neal J.
name: Sargent, Anneila I.
name: Glenn, Jason
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an unbiased census of deeply embedded protostars in Perseus, Serpens, and Ophiuchus, assembled by combining large-scale 1.1 mm Bolocam continuum and Spitzer Legacy surveys. We identify protostellar candidates based on their mid-infrared properties, correlate their positions with 1.1 mm core positions, and construct well-sampled SEDs using our extensive wavelength coverage (lam=1.25-1100 micron). Source classification based on the bolometric temperature yields a total of 39 Class 0 and 89 Class I sources in the three cloud sample. We compare to protostellar evolutionary models using the bolometric temperature-luminosity diagram, finding a population of low luminosity Class I sources that are inconsistent with constant or monotonically decreasing mass accretion rates. This result argues strongly for episodic accretion during the Class I phase, with more than 50% of sources in a ``sub-Shu'' (dM/dt < 1e-6 Msun/yr) accretion state. Average spectra are compared to protostellar radiative transfer models, which match the observed spectra fairly well in Stage 0, but predict too much near-IR and too little mid-IR flux in Stage I. Finally, the relative number of Class 0 and Class I sources are used to estimate the lifetime of the Class 0 phase; the three cloud average yields a Class 0 lifetime of 1.7e5 yr, ruling out an extremely rapid early accretion phase. Correcting photometry for extinction results in a somewhat shorter lifetime (1.1e5 yr). In Ophiuchus, however, we find very few Class 0 sources (N(Class0)/N(ClassI)=0.1-0.2), similar to previous studies of that cloud. The observations suggest a consistent picture of nearly constant average accretion rate through the entire embedded phase, with accretion becoming episodic by at least the Class I stage, and possibly earlier.
description: 31 pages, 19 figures, 8 tables; accepted for publication in ApJ
Rezension: Als ob sie träumend gingen
Creators: name: Zoidl, Veronika
Publisher: name: Medienimpulse
Year: 2019

description: Anna Baar hat mit „Als ob sie träumend gingen“ einen beeindruckenden Roman über Erinnerung und Medialität vorgelegt. Veronika Zoidl hat sich für die MEDIENIMPULSE auf Spurensuche durch diesen Jahrhundertext gemacht.
description: Medienimpulse, Bd. 57 Nr. 2 (2019): 2/2019 - Freies Heft
REU: RSSI-based rendezvous on the tiny terrestrial robotic platform (TinyTeRP)
Creators: name: Jang, Han Beol
name: Villalba, Roberto D.
name: Paley, Derek
name: Bergbreiter, Sarah
Publisher: name: Digital Repository at the University of Maryland
Year: 2013
Subjects: robot
rssi
algorithm
inertial

description: The TinyTeRP is a centimeter-scale, modular wheeled robotic platform developed for the study of swarm- ing or collective behavior. This paper presents the use of TinyTeRPs to implement collective recruitment and ren- dezvous to a fixed location using several RSSI-based gradient ascent algorithms. We also present a redesign of the wheel- based module with tank treads and a wider base, improving the robot’s mobility over uneven terrain and overall robustness. Lastly, we present improvements to the open source C libraries that allow users to easily implement high-level functions and closed-loop control on the TinyTeRP.
description: National Science Foundation Award #1062885
Thermal instability in a gravity-like scalar theory
Creators: name: Brandt, F. T.
name: Das, Ashok
name: Frenkel, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the question of stability of the ground state of a scalar theory which is a generalization of the phi^3 theory and has some similarity to gravity with a cosmological constant. We show that the ground state of the theory at zero temperature becomes unstable above a certain critical temperature, which is evaluated in closed form at high temperature.
description: Four pages, two figures. Revised version published in the Physical Review D
Energy minimization and AC demagnetization in a nanomagnet array
Creators: name: Ke, X.
name: Li, J.
name: Nisoli, C.
name: Lammert, Paul E.
name: McConville, W.
name: Wang, R. F.
name: Crespi, V. H.
name: Schiffer, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study AC demagnetization in frustrated arrays of single-domain ferromagnetic islands, exhaustively resolving every (Ising-like) magnetic degree of freedom in the systems. Although the net moment of the arrays is brought near zero by a protocol with sufficiently small step size, the final magnetostatic energy of the demagnetized array continues to decrease for finer-stepped protocols and does not extrapolate to the ground state energy. The resulting complex disordered magnetic state can be described by a maximum-entropy ensemble constrained to satisfy just nearest-neighbor correlations.
description: Published Version
Will it be possible to measure intrinsic gravitomagnetism with Lunar Laser Ranging?
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: In this note we mainly explore the possibility of measuring the action of the intrinsic gravitomagnetic field of the rotating Earth on the orbital motion of the Moon with the Lunar Laser Ranging (LLR) technique. Expected improvements in it should push the precision in measuring the Earth-Moon range to the mm level; the present-day Root-Mean-Square (RMS) accuracy in reconstructing the radial component of the lunar orbit is about 2 cm; its harmonic terms can be determined at the mm level. The current uncertainty in measuring the lunar precession rates is about 10^-1 milliarcseconds per year. The Lense-Thirring secular, i.e. averaged over one orbital period, precessions of the node and the perigee of the Moon induced by the Earth's spin angular momentum amount to 10^-3 milliarcseconds per year yielding transverse and normal shifts of 10^-1-10^-2 cm yr^-1. In the radial direction there is only a short-period, i.e. non-averaged over one orbital revolution, oscillation with an amplitude of 10^-5 m. Major limitations come also from some systematic errors induced by orbital perturbations of classical origin like, e.g., the secular precessions induced by the Sun and the oblateness of the Moon whose mismodelled parts are several times larger than the Lense-Thirring signal. The present analysis holds also for the Lue-Starkman perigee precession due to the multidimensional braneworld model by Dvali, Gabadadze and Porrati (DGP); indeed, it amounts to about 5 X 10^-3 milliarcseconds per year.
description: LaTex2e, 8 pages, 1 table, no figures, 49 references. Discussion on the DGP braneworld gravity model added. To appear in International Journal of Modern Physics D (IJMPD)
Die Medien, Demokratie und Fake News … ein Interview
Creators: name: Kaiser-Müller, Katharina
Publisher: name: Medienimpulse
Year: 2019

description: Demokratie mit und über Medien für Kinder und Jugendliche erlebbar zu machen und dabei die Fähigkeit der Selbstartikulation zu stärken, das bietet die DemokratieWERKstatt. Die MEDIENIMPULSE schauen etwas hinter die Kulissen der DemokratieWERKstatt und so hat Katharina Kaiser-Müller Frau Mag. Elisabeth Schindler-Müller von der Parlamentsdirektion um ein Interview gebeten:
description: Medienimpulse, Bd. 57 Nr. 3 (2019): 3/2019 - Propaganda, Manipulation und "Fake News"
A task analysis of conflict resolution
Creators: name: Taylor, Lin
Publisher: name: University of British Columbia
Year: 2010

description: Twenty four in therapy client performances were analysed in order to describe patterns related to conflict resolution. Twelve Gestalt events in which resolution was achieved were compared with twelve nonresolution events. Both groups, resolved and unresolved, were analyzed using three measures,-- 1) Experiencing scale; 2) Structural Analysis of Social Behavior, and 3) Vocal Quality Scale. Using these measures, the groups were divided into the three phases of conflict resolution--opposition, merging and resolution. In Gestalt, therapy, the client engages in a dialogue with himself to explore the two sides of the conflict. He usually moves from one chair to another, these chairs are known as the "experiencing" and "other" chair. In this study each chair was analyzed independently. The main hypothesis, that resolution events exhibit specific phase related behaviors that are not evident in non-resolution events, was tested using a number of comparisons. These comparisons between groups, between phases and between the two chairs indicate that the two groups are different and that there are three identifiable phases in a resolution event. The pattern of resolution begins with the two chairs in the opposition phase rejecting each other. This is indicated by a difference in level of Experiencing and uncooperative interaction as measured by S.A.S.B. The merging phase is when the two chairs begin to engage in productive dialogue. The other chair "softens" toward the experiencing chair, as indicated by a change in the vocal quality at the merging point. Also during this phase, the level of experiencing of the other chair increases to the level of the experiencing chair. The resolution phase is identified by the lack of difference between the two chairs; they apparently come together and function as one.
Origin of intermittent accretion-powered X-ray oscillations in neutron stars with millisecond spin periods
Creators: name: Lamb, Frederick K.
name: Boutloukos, Stratos
name: Van Wassenhove, Sandor
name: Chamberlain, Robert T.
name: Lo, Ka Ho
name: Miller, M. Coleman
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have shown previously that many of the properties of persistent accretion-powered millisecond pulsars can be understood if their X-ray emitting areas are near their spin axes and move as the accretion rate and structure of the inner disk vary. Here we show that this "nearly aligned moving spot model" may also explain the intermittent accretion-powered pulsations that have been detected in three weakly magnetic accreting neutron stars. We show that movement of the emitting area from very close to the spin axis to about 10 degrees away can increase the fractional rms amplitude from less than about 0.5 percent, which is usually undetectable with current instruments, to a few percent, which is easily detectable. The second harmonic of the spin frequency usually would not be detected, in agreement with observations. The model produces intermittently detectable oscillations for a range of emitting area sizes and beaming patterns, stellar masses and radii, and viewing directions. Intermittent oscillations are more likely in stars that are more compact. In addition to explaining the sudden appearance of accretion-powered millisecond oscillations in some neutron stars with millisecond spin periods, the model explains why accretion-powered millisecond oscillations are relatively rare and predicts that the persistent accretion-powered millisecond oscillations of other stars may become undetectable for brief intervals. It suggests why millisecond oscillations are frequently detected during the X-ray bursts of some neutron stars but not others and suggests mechanisms that could explain the occasional temporal association of intermittent accretion-powered oscillations with thermonuclear X-ray bursts.
description: 5 pages, 1 figure; includes additional discussion and updated references; accepted for publication in ApJL
Superfluid Phase Stability of $^3$He in Axially Anisotropic Aerogel
Creators: name: Pollanen, J.
name: Davis, J. P.
name: Reddy, B.
name: Shirer, K. R.
name: Choi, H.
name: Halperin, W. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Measurements of superfluid $^3$He in 98% aerogel demonstrate the existence of a metastable \emph{A}-like phase and a stable \emph{B}-like phase. It has been suggested that the relative stability of these two phases is controlled by anisotropic quasiparticle scattering in the aerogel. Anisotropic scattering produced by axial compression of the aerogel has been predicted to stabilize the axial state of superfluid $^3$He. To explore this possiblity, we used transverse acoustic impedance to map out the phase diagram of superfluid $^3$He in a $\sim 98$% porous silica aerogel subjected to 17% axial compression. We have previously shown that axial anisotropy in aerogel leads to optical birefringence and that optical cross-polarization studies can be used to characterize such anisotropy. Consequently, we have performed optical cross-polarization experiments to verify the presence and uniformity of the axial anisotropy in our aerogel sample. We find that uniform axial anisotropy introduced by 17% compression does not stabilize the \emph{A}-like phase. We also find an increase in the supercooling of the \emph{A}-like phase at lower pressure, indicating a modification to \emph{B}-like phase nucleation in \emph{globally} anisotropic aerogels.
description: 4 pages, 4 figures, submitted to LT25 (25th International Conference on Low Temperature Physics)
Megabits secure key rate quantum key distribution
Creators: name: Zhang, Q.
name: Takesue, H.
name: Honjo, T.
name: Wen, K.
name: Hirohata, T.
name: Suyama, M.
name: Takiguchi, Y.
name: Kamada, H.
name: Tokura, Y.
name: Tadanaga, O.
name: Nishida, Y.
name: Asobe, M.
name: Yamamoto, Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum cryptography (QC) can provide unconditional secure communication between two authorized parties based on the basic principles of quantum mechanics. However, imperfect practical conditions limit its transmission distance and communication speed. Here we implemented the differential phase shift (DPS) quantum key distribution (QKD) with up-conversion assisted hybrid photon detector (HPD) and achieved 1.3 M bits per second secure key rate over a 10-km fiber, which is tolerant against the photon number splitting (PNS) attack, general collective attacks on individual photons, and any other known sequential unambiguous state discrimination (USD) attacks.
description: 14 pages, 4 figures
First-order phase transitions: A study through the parallel tempering method
Creators: name: Fiore, Carlos E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the applicability of the {\it parallel tempering method} (PT) in the investigation of first- order phase transitions. In this method, replicas of the same system are simulated simultaneously at different temperatures and the configurations of two randomly chosen replicas can occasionally be interchanged. We apply the PT for the Blume-Emery-Griffiths (BEG) model, which displays strong first-order transitions at low temperatures. A precise estimate of coexistence lines is obtained, revealing that the PT may be a successful tool for the characterization of discontinuous transitions.
description: Physical Review E, 78, 041109 (2008)