cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Invariant integration on orthosymplectic and unitary supergroups
Creators: name: Coulembier, Kevin
name: Zhang, Ruibin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Group Theory (math.GR)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 58C50, 58A50, 17B99, 16T05

description: The orthosymplectic supergroup OSp(m|2n) and unitary supergroup U(p|q) are studied following a new approach that starts from Harish-Chandra pairs and links the sheaf-theoretical supermanifold approach of Berezin and others with the differential geometry approach of Rogers and others. The matrix elements of the fundamental representation of the Lie supergroup G are expressed in terms of functions on the product supermanifold G_0 x R^{0|N}, with G_0 the underlying Lie group and N the odd dimension of G. This product supermanifold is isomorphic to the supermanifold of G. This leads to a new expression for the standard generators of the corresponding Lie superalgebra g as invariant derivations on G. Using these results a new and transparent formula for the invariant integrals on OSp(m|2n) and U(p|q) is obtained.
The Use of a token system of reinforcement in behavioral-management training groups for single parent families
Creators: name: Olson, Jennifer Jo
Publisher: name: University of Calgary
Year: 1974
Subjects: subject: BF 199 O58 1973 Microfiche
subject: Behaviorism (Psychology)
subject: Motivation (Psychology)
subject: Interpersonal relations
subject: Reward (Psychology)
subject: Single-parent family

description: Bibliography: p. 49-52.
Multiscale magnetic fields in spiral galaxies: evolution and reversals
Creators: name: Moss, David
name: Stepanov, Rodion
name: Arshakian, Tigran
name: Beck, Rainer
name: Krause, Marita
name: Sokoloff, Dmitri
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Magnetic fields in nearby, star-forming galaxies reveal both large-scale patterns and small-scale structures. A large-scale field reversal may exist in the Milky Way but no such reversals have been observed so far in external galaxies. The effects of star-forming regions of galaxies need to be included when modelling the evolution of their magnetic fields, which can then be compared to future radio polarization observations. The causes of large-scale field reversals also need clarification. Our model of field evolution in isolated disc galaxies includes a standard mean-field dynamo and continuous injection of turbulent fields (the effect of supernova explosions) in discrete star forming regions by implicit small-scale dynamo action. Synthetic maps of radio synchrotronemission and Faraday rotation measures are computed. A large-scale dynamo is essential to obtain regular large-scale spiral magnetic fields, observed in many galaxies. These appear, on kpc scales in near energy equilibrium with the turbulence, after 1-2 Gyr (redshift 4-3). Turbulent field injection generates small-scale field structures. Depending on model parameters, large-scale field reversals may persist over many Gyrs and can survive until the present epoch. Significant polarized radio synchrotron emission from young galaxies is expected at redshifts less than 4. Faraday rotation measures (RM) are crucial to detect field reversals. Large-scale patterns ofrotation measures can be observed at redshifts less than 3. Our model can explain the general form of axisymmetric spiral fields with many local distortions, as observed in nearby galaxies. For a slightly different choice of parameters, large-scale field reversals can persist over the lifetime of a galaxy. Comparison of our synthetic maps with future observations of distant galaxies with the planned Square Kilometre Array (SKA) will allow refinement of models.
Dashed Hopes - EU- China Relations after the EWs 2016 Communication on China
Creators: name: Schucher, Günter
Publisher: name: China aktuell
Year: 2020

description: The latest EU policy paper on China published in October 2006 reflects European concerns about the ramifications of China’s rise in an unvarnished fashion. It therefore aroused widespread discontent in the Chinese academic and diplomatic community. This paper describes the EU’s changed perception of its Chinese counterpart. Dissenting from the views of Chinese critics, it will be argued that the EU still only has a vague idea of its role in Asian security and that the EU’s strategy towards China is dominated by its economic interests. That means the recent annoyance was primarily induced by economic problems and dashed hopes about the EU’s capacities to mould the other side. Consequently, the Chinese side can actively contribute to mending the relationship by taking European concerns seriously and by levelling the economic playing field.
description: China aktuell, China aktuell - 6/2007
UNESCO TWAS Webinar Introduction to Open Science May 2021 Useful links
Creators: name: Kuchma, Iryna
name: Imming, Melanie
Publisher: name: Zenodo
Year: 2021

description: Useful links that go with the UNESCO TWAS Webinar Introduction to Open Science May 2021. See for the webinar: https://www.youtube.com/watch?v=6TsFuaObQzU See for presentations from the webinar: Introduction to Open Science, Melanie Imming https://zenodo.org/record/4883033 Open Science Myths and Misconceptions, Iryna Kuchma https://zenodo.org/record/4883635 Sketchnotes, Dr Dasapta Erwin Irawan: https://figshare.com/articles/presentation/TWAS_CHAT_with_Melanie_Imming_and_Iryna_Kuchma/14626014
Nonviral gene transfer by chitosan polymer-based nanotechnology
Creators: name: Juan, Chih-Yang Michael
Publisher: name: University of British Columbia
Year: 2009

description: Gene therapy provides a potential alternative to conventional protein drug administration, allowing the body to produce its own drugs based on the exogenously introduced genetic information. Increasing efforts have been devoted to developing nonviral-based gene transfer systems owing to its attractive safety features. In this thesis, a nonviral chitosan/ФC31 gene transfer technology was evaluated for the delivery of two transgenes, SEAP and leptin. While SEAP reporter gene transfer allowed evaluation of delivery methods, leptin gene transfer permitted the assessment of therapeutic efficacy. Chitosan nanoparticles encapsulating 2 µg SEAP or leptin transgene were able to transfect HEK 293T cells, which secreted SEAP and human leptin proteins that achieved as much as 9414 ± 169 and 74 ± 5 ng/ml, respectively. In culture, the human leptin protein expressed by the leptin constructs effectively activated the leptin signalling pathway, represented by the phosphorylation of STAT3, demonstrating the protein’s biological activity. In vivo, SEAP gene transfer, in C57BL6/j mice, was achieved via intrasplenic and i.p. chitosan nanoparticle delivery. For the i.p. route, it was revealed that, at Day 1 post gene transfer, a 60% decrease in the DNA dose from 625 to 250 µg led to an at least ~7-fold increase in circulating SEAP, detected at 371 ng/ml. Furthermore, a similar level of SEAP (353 ng/ml) was obtainable with an even lower dose of DNA (50 µg). Mice receiving a single i.p. injection of chitosan nanoparticles containing 50 µg gWIZTM-SEAP plasmid showed transgene expression kinetics characteristic of those observed with a CMV promoter, with circulating SEAP measurements of 342 ± 60, 108 ± 18, 30 ± 3, and 7 ± 1 ng/ml at Day 1, 3, 5, and 7 post-treatment. Furthermore, a rare case of successful oral SEAP gene transfer was observed following a single oral feeding of chitosan nanoparticles. These data demonstrate that the use of the chitosan/ФC31 gene transfer system can lead to successful SEAP gene transfer via the i.p. route of administration, although in vivo data did not support effective leptin gene transfer. Future studies on improving transgene vector design are warranted for further development of this gene transfer system.
Nonvanishing boundary condition for the mKdV hierarchy and the Gardner equation
Creators: name: Gomes, J. F.
name: França, Guilherme S.
name: Zimerman, A. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A Kac-Moody algebra construction for the integrable hierarchy containing the Gardner equation is proposed. Solutions are systematically constructed employing the dressing method and deformed vertex operators which takes into account the nonvanishing boundary value problem for the mKdV hierarchy. Explicit examples are given and besides usual KdV like solitons, our solutions contemplate the large amplitude table-top solitons, kinks, dark solitons, breathers and wobbles.
Observational Evidence of S-Web Source of the Slow Solar Wind
Creators: name: Baker, D.
name: Demoulin, P.
name: Yardley, S. L.
name: Mihailescu, T.
name: van Driel-Gesztelyi, L.
name: D'Amicis, R.
name: Long, D. M.
name: To, A. S. H.
name: Owen, C. J.
name: Horbury, T. S.
name: Brooks, D. H.
name: Perrone, D.
name: French, R. J.
name: James, A. W.
name: Janvier, M.
name: Matthews, S.
name: Stangalini, M.
name: Valori, G.
name: Smith, P.
name: Cuadrado, R. Anzar
name: Peter, H.
name: Schuehle, U.
name: Harra, L.
name: Barczynski, K.
name: Berghmans, D.
name: Zhukov, A. N.
name: Rodriguez, L.
name: Verbeeck, C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: From 2022 March 18-21, active region (AR) 12967 was tracked simultaneously by Solar Orbiter (SO) at 0.35 au and Hinode/EIS at Earth. During this period, strong blue-shifted plasma upflows were observed along a thin, dark corridor of open field originating at the AR's leading polarity and continuing towards the southern extension of the northern polar coronal hole. A potential field source surface (PFSS) model shows large lateral expansion of the open magnetic field along the corridor. Squashing factor Q-maps of the large scale topology further confirm super-radial expansion in support of the S-Web theory for the slow wind. The thin corridor of upflows is identified as the source region of a slow solar wind stream characterised by approx. 300 km s-1 velocities, low proton temperatures of approx. 5 eV, extremely high density over 100 cm-3, and a short interval of moderate Alfvenicity accompanied by switchback events. When connectivity changes from the corridor to the eastern side of the AR, the in situ plasma parameters of the slow wind indicate a distinctly different source region. These observations provide strong evidence that the narrow open field corridors, forming part of the S-Web, produce extreme properties in their associated solar wind streams.
description: Accepted ApJ
Electrical and thermal spin accumulation in germanium
Creators: name: Jain, A.
name: Vergnaud, C.
name: Peiro, J.
name: Breton, J. C. Le
name: Prestat, E.
name: Louahadj, L.
name: Portemont, C.
name: Ducruet, C.
name: Baltz, V.
name: Marty, A.
name: Barski, A.
name: Bayle-Guillemaud, P.
name: Vila, L.
name: Attané, J. -P.
name: Augendre, E.
name: Jaffrès, H.
name: George, J. -M.
name: Jamet, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this letter, we first show electrical spin injection in the germanium conduction band at room temperature and modulate the spin signal by applying a gate voltage to the channel. The corresponding signal modulation agrees well with the predictions of spin diffusion models. Then by setting a temperature gradient between germanium and the ferromagnet, we create a thermal spin accumulation in germanium without any tunnel charge current. We show that temperature gradients yield larger spin accumulations than pure electrical spin injection but, due to competing microscopic effects, the thermal spin accumulation in germanium remains surprisingly almost unchanged under the application of a gate voltage to the channel.
description: 7 pages, 3 figures
In-source and in-trap formation of molecular ions in the actinide mass range at CERN-ISOLDE
Creators: name: Au, M.
name: Athanasakis-Kaklamanakis, M.
name: Nies, L.
name: Ballof, J.
name: Berger, R.
name: Chrysalidis, K.
name: Fischer, P.
name: Heinke, R.
name: Johnson, J.
name: Köster, U.
name: Leimbach, D.
name: Marsh, B.
name: Mougeot, M.
name: Reilly, J.
name: Reis, E.
name: Schlaich, M.
name: Schweiger, Ch.
name: Schweikhard, L.
name: Stegemann, S.
name: Wessolek, J.
name: Wienholtz, F.
name: Wilkins, S. G.
name: Wojtaczka, W.
name: Düllmann, Ch. E.
name: Rothe, S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The use of radioactive molecules for fundamental physics research is a developing interdisciplinary field limited dominantly by their scarce availability. In this work, radioactive molecular ion beams containing actinide nuclei extracted from uranium carbide targets are produced via the Isotope Separation On-Line technique at the CERN-ISOLDE facility. Two methods of molecular beam production are studied: extraction of molecular ion beams from the ion source, and formation of molecular ions from the mass-separated ion beam in a gas-filled radio-frequency quadrupole ion trap. Ion currents of U$^+$, UO$_{1-3}^+$, UC$_{1-3}^+$, UF$_{1-4}^+$, UF$_{1,2}$O$_{1,2}^+$ are reported. Metastable tantalum and uranium fluoride molecular ions are identified. Formation of UO$_{1-3}^+$, U(OH)$_{1-3}^+$, UC$_{1-3}^+$, UF$_{1,2}$O$_{1,2}^+$ from mass-separated beams of U$^+$, UF$_{1,2}^+$ with residual gas is observed in the ion trap. The effect of trapping time on molecular formation is presented.
description: 6 pages, 7 figures
Effective Digital Image Watermarking in YCbCr Color Space Accompanied by Presenting a Novel Technique Using DWT
Creators: name: Khalili, Mehdi
name: Asatryan, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences
subject: D.4.6; K.6.5; K.4.2
subject: 68U10, 68U20, 65C20, 94A08, 94A24, 94A60, 11T71, 14G50, 68P25, 81P94

description: In this paper, a quantization based watermark casting and blind watermark retrieval algorithm operating in YCbCr color space using discrete wavelet transform (DWT), for ownership verification and image authentication applications is implemented. This method uses implicit visual masking by inserting watermark bits into only the wavelet coefficients of high magnitude, in Y channel of YCbCr color space. A blind watermark retrieval technique that can detect the embedded watermark without the help from the original uncorrupted image is devised which is computationally efficient. The new watermarking algorithm combines and adapts various aspects from existing watermarking methods. Experimental results show that the proposed technique to embed watermark provides extra imperceptibility and robustness against various signal processing attacks in comparison with the same technique in RGB color space.
description: 12 Pages, 4 Figures, 8 Tables
Demokratie chinesischer Prägung - Oer KWSL Parteitag der Kommunistischen Partei Chinas
Creators: name: Holbig, Heike
Publisher: name: China aktuell
Year: 2020

description: In seiner Berichterstattung über den XVII. Parteitag der KPCh betonte der englischsprachige Service der staatlichen Nachrichtenagentur Xinhua mehrfach, dass der Begriff „Demokratie“ im Rechenschaftsbericht des Parteichefs Hu Jintao über 60-mal (genau: 61-mal) Erwähnung gefunden habe und damit zu einem der am häufigsten verwendeten politischen Konzepte gehöre (XNA, 15.10.07). Damit bestätigte der englische Nachrichtenservice, dessen Hauptaufgabe in der Antizipation und Befriedigung westlicher Erwartungen an die chinesische Politik besteht, die Hoffnungen auf eine Intensivierung politischer Reform und Demokratisierung in der Volksrepublik, die sich nicht nur im Ausland, sondern teilweise auch unter inländischen Eliten an den jüngsten Parteitag und die damit eingeläutete zweite Amtszeit Hu Jintaos geknüpft hatten.
description: China aktuell, China aktuell - 6/2007
Simulations of BAO reconstruction with a quasar Lyman-alpha survey
Creators: name: Goff, J. -M. Le
name: Magneville, C.
name: Rollinde, E.
name: Peirani, S.
name: Petitjean, P.
name: Pichon, C.
name: Rich, J.
name: Yeche, C.
name: Aubourg, E.
name: Busca, N.
name: Charlassier, R.
name: Delubac, T.
name: Hamilton, J. C.
name: Delabrouille, N. Palanque
name: Paris, I.
name: Vargas, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The imprint of Baryonic Acoustic Oscillations (BAO) on the matter power spectrum can be constrained using the neutral hydrogen density in the intergalactic medium as a tracer of the matter density. One of the goals of the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS-III) is to derive the Hubble expansion rate and the angular scale from the BAO signal in the IGM. To this aim, the Lyman-alpha forest of 10^5 quasars will be observed in the redshift range 2.2
description: 9 pages, 10 figures, 1 table
Circular motion analogue Unruh effect in a $2+1$ thermal bath: Robbing from the rich and giving to the poor
Creators: name: Bunney, Cameron R. D.
name: Louko, Jorma
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Unruh effect states that a uniformly linearly accelerated observer with proper acceleration $a$ experiences the Minkowski vacuum as a thermal state at temperature $T_U=a/(2π)$. An observer in uniform circular motion experiences a similar effective temperature, operationally defined in terms of excitation and de-excitation rates, and physically interpretable in terms of synchrotron radiation, but this effective temperature depends not just on the acceleration but also on the orbital speed and the excitation energy. In this paper we consider an observer in uniform circular motion when the Minkowski vacuum is replaced by an ambient thermal bath, and we address the interplay of ambient temperature, Doppler effect, acceleration, and excitation energy. Specifically, we consider a massless scalar field in $2 + 1$ spacetime dimensions, probed by an Unruh-DeWitt detector, in a Minkowski (rather than proper) time formulation: this setting describes proposed analogue spacetime systems in which the effect may become experimentally testable, and in which an ambient temperature will necessarily be present. We establish analytic results for the observer's effective temperature in several asymptotic regions of the parameter space and provide numerical results in the interpolating regions, finding that an acceleration effect can be identified even when the Doppler effect dominates the overall magnitude of the response. We also identify parameter regimes where the observer sees a temperature lower than the ambient temperature, experiencing a cooling Unruh effect.
description: 24 pages, 5 figures. v2: references added, typos corrected. v3: references added, section 2 expanded after referee comments, typos corrected
A gas cloud on its way towards the super-massive black hole in the Galactic Centre
Creators: name: Gillessen, S.
name: Genzel, R.
name: Fritz, T. K.
name: Quataert, E.
name: Alig, C.
name: Burkert, A.
name: Cuadra, J.
name: Eisenhauer, F.
name: Pfuhl, O.
name: Dodds-Eden, K.
name: Gammie, C. F.
name: Ott, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Measurements of stellar orbits provide compelling evidence that the compact radio source Sagittarius A* at the Galactic Centre is a black hole four million times the mass of the Sun. With the exception of modest X-ray and infrared flares, Sgr A* is surprisingly faint, suggesting that the accretion rate and radiation efficiency near the event horizon are currently very low. Here we report the presence of a dense gas cloud approximately three times the mass of Earth that is falling into the accretion zone of Sgr A*. Our observations tightly constrain the cloud's orbit to be highly eccentric, with an innermost radius of approach of only ~3,100 times the event horizon that will be reached in 2013. Over the past three years the cloud has begun to disrupt, probably mainly through tidal shearing arising from the black hole's gravitational force. The cloud's dynamic evolution and radiation in the next few years will probe the properties of the accretion flow and the feeding processes of the super-massive black hole. The kilo-electronvolt X-ray emission of Sgr A* may brighten significantly when the cloud reaches pericentre. There may also be a giant radiation flare several years from now if the cloud breaks up and its fragments feed gas into the central accretion zone.
description: in press at Nature
A new room-temperature equation of state of Bi up to 260 GPa
Creators: name: Campbell, Daniel J.
name: Sneed, Daniel T.
name: O'Bannon, Earl F.
name: Söderlind, Per
name: Jenei, Zsolt
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: At room temperature, bismuth undergoes several structural transitions with increasing pressure before taking on a body-centered cubic (bcc) phase at approximately 8 GPa. The bcc structure is stable to the highest measured pressure and its simplicity, along with its high compressibility and atomic number, make it an enticing choice as a pressure calibrant. We present three data sets on the compression of bismuth in a diamond anvil cell in a neon pressure medium, up to a maximum pressure of about 260 GPa. The use of a soft pressure medium reduces deviatoric stress when compared to previous work. With an expanded pressure range, higher point density, and a decreased uniaxial stress component, we are able to provide more reliable equation of state (EOS) parameters. We also conduct density functional theory (DFT) electronic-structure calculations that confirm the stability of the bcc phase at high pressure.
description: 7 pages, 5 figures in main text; 7 pages, 2 figures in supplement
Quantum and classical contributions to entropy production in fermionic and bosonic Gaussian systems
Creators: name: Ptaszynski, Krzysztof
name: Esposito, Massimiliano
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: As previously demonstrated, the entropy production -- a key quantity characterizing the irreversibility of thermodynamic processes -- is related to generation of correlations between degrees of freedom of the system and its thermal environment. This raises the question of whether such correlations are of a classical or quantum nature, namely, whether they are accessible through local measurements on the correlated degrees of freedom. We address this problem by considering fermionic and bosonic Gaussian systems. We show that for fermions the entropy production is mostly quantum due to the parity superselection rule which restricts the set of physically allowed measurements to projections on the Fock states, thus significantly limiting the amount of classically accessible correlations. In contrast, in bosonic systems a much larger amount of correlations can be accessed through Gaussian measurements. Specifically, while the quantum contribution may be important at low temperatures, in the high temperature limit the entropy production corresponds to purely classical position-momentum correlations. Our results demonstrate an important difference between fermionic and bosonic systems regarding the existence of a quantum-to-classical transition in the microscopic formulation of the entropy production. They also show that entropy production can be mainly caused by quantum correlations even in the weak coupling limit, which admits a description in terms of classical rate equations for state populations, as well as in the low particle density limit, where the transport properties of both bosons and fermions converge to those of classical particles.
description: 23 pages, 17 figures
Caracterisation de materieaux metalliques et de scories issus des ferriers de la Montagne Noire
Creators: name: Lavielle, Elisabeth
name: Piraggi, Bernard
name: Dabosi, Francis
name: Sablayrolles, Robert
name: Domergue, Claude
Publisher: name: Jahrbuch des Römisch-Germanischen Zentralmuseums Mainz
Year: 2020

description: Jahrbuch des Römisch-Germanischen Zentralmuseums Mainz, Bd. 35 Nr. 2 (1988)
Temporal Deconvolution study of Long and Short Gamma-Ray Burst Light curves
Creators: name: Bhat, P. N.
name: Briggs, Michael S.
name: Connaughton, Valerie
name: Kouveliotou, Chryssa
name: van der Horst, Alexander J.
name: Paciesas, William
name: Meegan, Charles A.
name: Bissaldi, Elisabetta
name: Burgess, Michael
name: Chaplin, Vandiver
name: Diehl, Roland
name: Fishman, Gerald
name: Fitzpatrick, Gerard
name: Foley, Suzanne
name: Gibby, Melissa
name: Giles, Misty M.
name: Goldstein, Adam
name: Greiner, Jochen
name: Gruber, David
name: Guiriec, Sylvain
name: von Kienlin, Andreas
name: Kippen, Marc
name: McBreen, Sheila
name: Preece, Robert
name: Rau, Arne
name: Tierney, Dave
name: Wilson-Hodge, Colleen
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The light curves of Gamma-Ray Bursts (GRBs) are believed to result from internal shocks reflecting the activity of the GRB central engine. Their temporal deconvolution can reveal potential differences in the properties of the central engines in the two populations of GRBs which are believed to originate from the deaths of massive stars (long) and from mergers of compact objects (short). We present here the results of the temporal analysis of 42 GRBs detected with the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope. We deconvolved the profiles into pulses, which we fit with lognormal functions. The distributions of the pulse shape parameters and intervals between neighboring pulses are distinct for both burst types and also fit with lognormal functions. We have studied the evolution of these parameters in different energy bands and found that they differ between long and short bursts. We discuss the implications of the differences in the temporal properties of long and short bursts within the framework of the internal shock model for GRB prompt emission.
description: 38 pages, 11 figures
LITERATURA INFANTIL E MATEMÁTICA: ANÁLISE DO DESENVOLVIMENTO DE ATIVIDADES LÚDICAS E INTERDISCIPLINARES A DISTÂNCIA NA EDUCAÇÃO INFANTIL
Creators: name: Diego de Vargas Matos
name: Avaetê de Lunetta e Rodrigues Guerra
Publisher: name: Zenodo
Year: 2024

description: A literatura infantil e a matemática são duas áreas fundamentais no desenvolvimento educacional das crianças. Através da literatura, as crianças são introduzidas a um mundo de imaginação, criatividade e linguagem, enquanto a matemática proporciona habilidades de raciocínio lógico, resolução de problemas e pensamento crítico. Integrar essas duas disciplinas pode ser uma forma eficaz de promover um aprendizado significativo e prazeroso para as crianças. Pensando nisso, foram desenvolvidas atividades a distância em duas instituições de ensino, com estudantes do Jardim B que possuíam 5 anos de idade. Essas atividades também foram realizadas por outras crianças da mesma faixa etária que não estavam vinculadas a essas instituições de ensino, por meio de impressão do roteiro de atividades e troca de mensagens instantâneas com seus responsáveis legais pelo aplicativo WhatsApp. Os resultados obtidos na pesquisa mostraram que as atividades propostas foram eficazes para o desenvolvimento das habilidades matemáticas das crianças. Além disso, as atividades lúdicas e interdisciplinares também contribuíram para o desenvolvimento de outras habilidades, como a leitura, a interpretação de texto e a criatividade.
Active particles with delayed attractions form quaking crystallites
Creators: name: Chen, Pin-Chuan
name: Kroy, Klaus
name: Cichos, Frank
name: Wang, Xiangzun
name: Holubec, Viktor
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Perception-reaction delays have experimentally been found to cause a spontaneous circling of microswimmers around a targeted center. Here we investigate the many-body version of this experiment with Brownian-dynamics simulations of active particles in a plane. For short delays, the soft spherical discs form a hexagonal colloidal crystallite around a fixed target particle. Upon increasing the delay time, we observe a bifurcation to a chiral dynamical state that we can map onto that found for a single active particle. The different angular velocities at different distances from the target induce shear stresses that grow with increasing delay. As a result, tangential and, later, also radial shear bands intermittently break the rotating crystallite. Eventually, for long delays, the discs detach from the target particle to circle around it near the preferred single-particle orbit, while spinning and trembling from tidal quakes
description: Videos available on https://youtube.com/playlist?list=PLDwaP_kIyigWI4637AQH1upD4seyYOynw
Resonant Alfven waves in partially ionized plasmas of the solar atmosphere
Creators: name: Soler, R.
name: Andries, J.
name: Goossens, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Magnetohydrodynamic (MHD) waves are ubiquitous in the solar atmosphere. In magnetic waveguides resonant absorption due to plasma inhomogeneity naturally transfers wave energy from large-scale motions to small-scale motions. In the cooler parts of the solar atmosphere as, e.g., the chromosphere, effects due to partial ionization may be relevant for wave dynamics and heating. Aims. We study resonant Alfven waves in partially ionized plasmas. Methods. We use the multifluid equations in the cold plasma approximation. We investigate propagating resonant MHD waves in partially ionized flux tubes. We use approximate analytical theory based on normal modes in the thin tube and thin boundary approximations along with numerical eigenvalue computations. Results. We find that the jumps of the wave perturbations across the resonant layer are the same as in fully ionized plasmas. The damping length due to resonant absorption is inversely proportional to the frequency, while that due to ion-neutral collisions is inversely proportional to the square of the frequency. For observed frequencies in the solar atmosphere, the amplitude of MHD kink waves is more efficiently damped by resonant absorption than by ion-neutral collisions. Conclusions. Most of the energy carried by chromospheric kink waves is converted into localized azimuthal Alfven waves that can deposit energy in the coronal medium. The dissipation of wave energy in the chromosphere due to ion-neutral collisions is only effective for high-frequency waves. The chromosphere acts as a filter for kink waves with periods shorter than 10 s.
Active optical clock based on four-level quantum system
Creators: name: Zhang, Tonggang
name: Wang, Yanfei
name: Zang, Xiaorun
name: Zhuang, Wei
name: Chen, Jingbiao
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Active optical clock, a new conception of atomic clock, has been proposed recently. In this report, we propose a scheme of active optical clock based on four-level quantum system. The final accuracy and stability of two-level quantum system are limited by second-order Doppler shift of thermal atomic beam. To three-level quantum system, they are mainly limited by light shift of pumping laser field. These limitations can be avoided effectively by applying the scheme proposed here. Rubidium atom four-level quantum system, as a typical example, is discussed in this paper. The population inversion between $6S_{1/2}$ and $5P_{3/2}$ states can be built up at a time scale of $10^{-6}$s. With the mechanism of active optical clock, in which the cavity mode linewidth is much wider than that of the laser gain profile, it can output a laser with quantum-limited linewidth narrower than 1 Hz in theory. An experimental configuration is designed to realize this active optical clock.
description: 5 pages
Syncretic socialism in post-colonial West Bengal : mobilizing and disciplining women for a ‘sustha’ nation-state
Creators: name: Datta, Anisha
Publisher: name: University of British Columbia
Year: 2020

description: The discourse of equality, emancipation and dignity for women does not necessarily lead to the formation of an emancipated female subject, but often ends up supporting structures and practices against which the struggle was begun. The thesis develops this argument through a close reading of the textual discourse of the socialist women’s mass organization, the Paschim Banga Ganatantrik Mahilaa Samity (PBGMS). The PBGMS is the largest state unit of the All India Democratic Women’s Association (AIDWA), which in turn is affiliated with the Communist Party of India-Marxist (CPI-M), the largest communist party in India. While the PBGMS relentlessly fights for women’s rights in public life, an examination of its published materials suggests that its ultimate aim to create a sustha (normal) nation-state, a cohesive society and a happy family turn these rights into new shackles for women. In particular, through a close reading of its publications – including pedagogical booklets, editorials, essays, poems, travelogues and fictional narratives from the periodical Eksathe – the thesis explores how the PBGMS views women instrumentally as reproductive and socializing agents for the supply of future sources of productive labor and as productive beings to act as a reserve force of labor. While comparisons can be made with other countries in the socialist world, in particular China and the USSR, this thesis focuses on PBGMS textual discourse within the specific social and political history of India, in particular Bengal. Through its selective appropriation and use of ideologies from both traditional cultural resources and modern political philosophies, the organization produces a ‘syncretic’ variety of socialism. In particular, by discursively unifying diverse beliefs and tenets the organization ironically produces a narrow nation-state centred orthodoxy rather than a dynamic heterodoxy and pluralism. This research attempts to answer the question: In what ways does the textual discourse of this communist party affiliated women’s mass organization, in pursuit of building a sustha socialist nation-state, attempt to discipline the political constituency of women? Although the political party and its mass organization aim to mobilize women by appealing to their equality and emancipation, this mobilization also seeks to constrain women’s subjectivity and curtail the scope of their emancipation.
Gyroscopic polynomials
Creators: name: Ellison, Abram C.
name: Julien, Keith
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M70, 65M35

description: Gyroscopic alignment of a fluid occurs when flow structures align with the rotation axis. This often gives rise to highly spatially anisotropic columnar structures that in combination with complex domain boundaries pose challenges for efficient numerical discretizations and computations. We define gyroscopic polynomials to be three-dimensional polynomials expressed in a coordinate system that conforms to rotational alignment. We remap the original domain with radius-dependent boundaries onto a right cylindrical or annular domain to create the computational domain in this coordinate system. We find the volume element expressed in gyroscopic coordinates leads naturally to a hierarchy of orthonormal bases. We build the bases out of Jacobi polynomials in the vertical and generalized Jacobi polynomials in the radial. Because these coordinates explicitly conform to flow structures found in rapidly rotating systems the bases represent fields with a relatively small number of modes. We develop the operator structure for one-dimensional semi-classical orthogonal polynomials as a building block for differential operators in the full three-dimensional cylindrical and annular domains. The differential operators of generalized Jacobi polynomials generate a sparse linear system for discretization of differential operators acting on the gyroscopic bases. This enables efficient simulation of systems with strong gyroscopic alignment.
Vibrating-coil magnetometry of the spin liquid properties of Tb2Ti2O7
Creators: name: Legl, S.
name: Krey, C.
name: Dunsiger, S. R.
name: Dabkowska, H. A.
name: Rodriguez, J. A.
name: Luke, G. M.
name: Pfleiderer, C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have explored the spin liquid state in Tb2Ti2O7 with vibrating coil magnetometry down to 0.04 K under magnetic fields up to 5 T. We observe magnetic history dependence below $T < 0.2$K reminiscent of the classical spin ice systems Ho2Ti2O7 and Dy2Ti2O7. The magnetic phase diagram inferred from the magnetization is essentially isotropic, without evidence of magnetization plateaux as anticipated for so-called quantum spin ice, predicted theoretically for [111] when quantum fluctuations renormalize the interactions. Instead, the magnetization for $T \ll T*$ agrees semi-quantitatively with the predictions of "all-in/all-out" (AIAO) antiferromagnetism. Taken together this suggests that the spin liquid state in Tb2Ti2O7 is akin to an incipient AIAO-antiferromagnet.
description: accepted in Physical Review Letters
GRB 191019A: a short gamma-ray burst in disguise from the disk of an active galactic nucleus
Creators: name: Lazzati, Davide
name: Perna, Rosalba
name: Gompertz, Benjamin
name: Levan, Andrew
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Long and short gamma-ray bursts (GRBs), canonically separated at around 2 seconds duration, are associated with different progenitors: the collapse of a massive star and the merger of two compact objects, respectively. GRB 191019A was a long GRB ($T_{90}\sim64$ s). Despite the relatively small redshift z=0.248 and HST followup observations, an accompanying supernova was not detected. In addition, the host galaxy did not have significant star formation activity. Here we propose that GRB 191019A was produced by a binary compact merger, whose prompt emission was stretched in time by the interaction with a dense external medium. This would be expected if the burst progenitor was located in the disk of an active galactic nucleus, as supported by the burst localization close to the center of its host galaxy. We show that the light curve of GRB 191019A can be well modeled by a burst of intrinsic duration t=1.1 s and of energy $E_{\rm{iso}}=10^{51}$ erg seen moderately off-axis, exploding in a medium of density $10^7-10^8$ cm$^{-3}$. The double-peaked light curve carries the telltale features predicted for GRBs in high-density media, where the first peak is produced by the photosphere, and the second by the overlap of reverse shocks that take place before the internal shocks could happen. This would make GRB 191019A the first confirmed stellar explosion from within an accretion disk, with important implications for the formation and evolution of stars in accretion flows and for gravitational waves source populations.
description: 6 pages, 2 figures. Accepted for publication in ApJL
An improved determination of the width of the top quark
Creators: name: D0 Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present an improved determination of the total width of the top quark, $Γ_t$, using 5.4 fb$^{-1}$ of integrated luminosity collected by the D0 Collaboration at the Tevatron $p\bar{p}$ Collider. The total width $Γ_t$ is extracted from the partial decay width $Γ(t\to Wb)$ and the branching fraction $\mathcal{B}(t\to Wb)$. $Γ(t\to Wb)$ is obtained from the $t$-channel single top quark production cross section and $\mathcal{B}(t\to Wb)$ is measured in $t\bar{t}$ events. For a top mass of $172.5\;\rm GeV$, the resulting width is $Γ_t = 2.00^{+0.47}_{-0.43}$ GeV. This translates to a top-quark lifetime of $τ_t = (3.29^{+0.90}_{-0.63})\times10^{-25}$ s. We also extract an improved direct limit on the CKM matrix element $0.81 < |V_{tb}| \leq 1$ at 95% C.L. and a limit of $|V_{tb'}| < 0.59$ for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.
description: 8 pages, 4 figures, submitted to Phys. Rev. D (RC)
Pharmacists' preferences for providing patient-centred services
Creators: name: Grindrod, Kelly Anne
Publisher: name: University of British Columbia
Year: 2009

description: Introduction: In Canada, most pharmacists are not paid to provide patient-centred services and in other jurisdictions, most programs for these types of services have suffered from low uptake and limited sustainability. Objective: To determine pharmacists' preferences for providing patient-centred services. Methods: Senior students and pharmacists in British Columbia and Alberta were recruited to complete a questionnaire that included a discrete choice experiment. Using 18 different choice-sets, respondents were asked if they preferred to provide one of two hypothetical patient-centred services or to provide typical pharmacy services. Each service differed by the following attributes: type of service; personal income; setting; job satisfaction; professional service fee; and required continuing education. Multinomial logit and latent class regression modeling was used to determine respondents' relative preference weights for each attribute. Results: Of 539 respondents who completed the questionnaire, 49% were dispensary pharmacists or managers, 12% were dispensary owners or regional managers, 21% were clinical pharmacists and 16% were students. Respondents were very averse to seeing a decrease in their income or job satisfaction and preferred to have access to a weeklong course or a paid preceptorship. Respondents also preferred to provide medication or disease management services, but were not as interested in providing screening services. Finally, respondents had a slight preference for providing services in a clinic rather than a dispensary. Preferences differed according to several factors including respondents' employment and time in practice. Conclusion: Compared to offering only typical pharmacy services, many pharmacists seem to prefer to provide patient-centred services. However, before adopting these services, most pharmacists will need assurance that their income and job satisfaction will be maintained or increase, and that they will have access to suitable continuing education programs. Pharmacists who are attracted to clinical roles will be more interested in the type of service to be delivered. Decision-makers and pharmacy leaders who are looking to develop and implement a program for patient-centred pharmacy services should carefully consider these preferences to improve the likelihood that the program will be successful and sustainable.
Seeing-limited Coupling of Starlight into Single-mode Fiber with a Small Telescope
Creators: name: Sliski, David H.
name: Blake, Cullen H.
name: Eastman, Jason D.
name: Halverson, Samuel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: An optical fiber link to a telescope provides many advantages for spectrometers designed to detect and characterize extrasolar planets through precise radial velocity (PRV) measurements. In the seeing-limited regime, a multi-mode fiber is typically used so that a significant amount of starlight may be captured. In the near-diffraction-limited case, either with an adaptive optics system or with a small telescope at an excellent site, efficiently coupling starlight into a much smaller, single-mode fiber may be possible. In general, a spectrometer designed for single-mode fiber input will be substantially less costly than one designed for multi-mode fiber input. We describe the results of tests coupling starlight from a 70 cm telescope at Mt. Hopkins, Arizona into the single-mode fiber of the MINERVA-Red spectrometer at a wavelength of ~850 nm using a low-speed tip/tilt image stabilization system comprising all commercial, off-the-shelf components. We find that approximately 0.5% of the available starlight is coupled into the single-mode fiber under seeing conditions typical for observatories hosting small telescopes, which is close to the theoretical expectation. We discuss scientific opportunities for small telescopes paired with inexpensive, high-resolution spectrometers, as well as upgrade paths that should significantly increase the coupling efficiency for the MINERVA-Red system.
description: 8 pages, 4 figures. Accepted for publication in Astronomische Nachrichten
The ideal of p-compact operators: a tensor product approach
Creators: name: Galicer, Daniel
name: Lassalle, Silvia
name: Turco, Pablo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47L20, 46A32, 47B07, 47B10

description: We study the space of $p$-compact operators $\mathcal K_p$, using the theory of tensor norms and operator ideals. We prove that $\mathcal K_p$ is associated to $/d_p$, the left injective associate of the Chevet-Saphar tensor norm $d_p$ (which is equal to $g_{p'}'$). This allows us to relate the theory of $p$-summing operators with that of $p$-compact operators. With the results known for the former class and appropriate hypothesis on $E$ and $F$ we prove that $\mathcal K_p(E;F)$ is equal to $\mathcal K_q(E;F)$ for a wide range of values of $p$ and $q$, and show that our results are sharp. We also exhibit several structural properties of $\mathcal K_p$. For instance, we obtain that $\mathcal K_p$ is regular, surjective, totally accessible and characterize its maximal hull $\mathcal K_p^{max}$ as the dual ideal of the $p$-summing operators, $Π_p^{dual}$. Furthermore, we prove that $\mathcal K_p$ coincides isometrically with $\mathcal {QN}_p^{dual}$, the dual ideal of the quasi $p$-nuclear operators.
description: 18 pages