cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Low-frequency Quantum Oscillations from Interactions in Layered Metals
Creators: name: Allocca, Andrew A.
name: Cooper, Nigel R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Metals composed of weakly-coupled, stacked layers possess a Fermi surface that slightly varies in size along the stacking direction. This appears in de Haas-van Alphen (dHvA) oscillations of the magnetisation with magnetic field as two close frequencies, corresponding to the two extremal Fermi surface cross-sectional areas. We show that, for layered materials of sufficiently high mobility, Coulomb interactions can have a dramatic effect on the form of the dHvA oscillations: there is also generically an oscillation at the small difference of the two large frequencies. We determine the size and form of this effect, and show that it probes the short-range part of the Coulomb interactions within the layered material. We argue that this interaction effect may explain recent experimental observations of anomalous low-frequency dHvA oscillations in the ultrapure delafossites.
description: 5 + 5 pages, 1 figure
Triggering on Emerging Jets
Creators: name: Linthorne, Dylan
name: Stolarski, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Confining dark sectors at the GeV scale can lead to novel collider signatures including those termed emerging jets with large numbers of displaced vertices. The triggers at the LHC experiments were not designed with this type of new physics in mind, and triggering can be challenging, especially if the mediator is relatively light and/or has quantum numbers such that additional jets are not automatically produced in each event. We show that the efficiency and the total event rate at current triggers can be significantly improved by considering initial state radiation of the events, with the largest increase in rate coming from simulation of two additional jets. We also explore possible new triggers that employ hit counts in different tracker layers as input into a machine learning algorithm. We show that these new triggers can have reasonably low background rates, and that they are sensitive to a wide range of new physics parameters even when trained on a single model.
description: 14 pages, 9 figures
¿Cómo continuar la carrera investigadora después de la tesis doctoral?
Creators: name: Salinas, Daniel Torres
Publisher: name: Zenodo
Year: 2019
Subjects: Carrera Investigadora
Carrera Científica
Tesis doctoral

description: Mesa redonda coordinada por Daniel Torres Salinas incluida en el programa de las jornadas JIFFI - II Congreso / IV Jornadas de Investigadores en Formación: Fomentando la Interdisciplinariedad. El objetivo de la misma fue discutir las posibilidades profesionales y académicas después de realizar la tesis.
Characterizing Supernova Progenitors via the Metallicities of their Host Galaxies, from Poor Dwarfs to Rich Spirals
Creators: name: Prieto, Jose L.
name: Stanek, Krzysztof Z.
name: Beacom, John F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate how the different types of supernovae are relatively affected by the metallicity of their host galaxy. We match the SAI Supernova Catalog to the SDSS-DR4 catalog of star-forming galaxies with measured metallicities. These supernova host galaxies span a range of oxygen abundance from 12 + log(O/H) = 7.9 to 9.3 (~ 0.1 to 2.7 solar) and a range in absolute magnitude from MB = -15.2 to -22.2. To reduce the various observational biases, we select a subsample of well-characterized supernovae in the redshift range from 0.01 to 0.04, which leaves us with 58 SN II, 19 Ib/c, and 38 Ia. We find strong evidence that SN Ib/c are occurring in higher-metallicity host galaxies than SN II, while we see no effect for SN Ia relative to SN II. We note some extreme and interesting supernova-host pairs, including the metal-poor (~ 1/4 solar) host of the recent SN Ia 2007bk, where the supernova was found well outside of this dwarf galaxy. To extend the luminosity range of supernova hosts to even fainter galaxies, we also match all the historical supernovae with z < 0.3 to the SDSS-DR6 sky images, resulting in 1225 matches. This allows us to identify some even more extreme cases, such as the recent SN Ic 2007bg, where the likely host of this hypernova-like event has an absolute magnitude MB ~ -12, making it one of the least-luminous supernova hosts ever observed. This low-luminosity host is certain to be very metal poor (~ 1/20 solar), and therefore this supernova is an excellent candidate for association with an off-axis GRB. The two catalogs that we have constructed are available online and will be updated regularly. Finally, we discuss various implications of our findings for understanding supernova progenitors and their host galaxies.
description: ApJ accepted, 26 pages, 5 figures, 1 table. Updated catalogs are available at http://www.astronomy.ohio-state.edu/~prieto/snhosts/
การประเมินทางด้านเทคนิคและทางด้านเศรษฐศาสตร์ของโรงไฟฟ้าเซลล์แสงอาทิตย์แบบติดตั้งอยู่กับที่และแบบเคลื่อนที่ตามดวงอาทิตย์ในประเทศไทย
Creators: name: ฉัตรชัย ศิริสัมพันธ์วงษ์
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2556
Subjects: ระบบเซลล์แสงอาทิตย์แบบเคลื่อนที่ตามดวงอาทิตย์, ระบบเซลล์แสงอาทิตย์แบบติดตั้งอยู่กับที่

description: 5, 32, วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม
Prognosis of breast cancer : a survival analysis of 1184 patients with 4-10 years follow-up, illustrating the relative importance of estrogen receptors, axillary nodes, clinical stage and tumor necrosis
Creators: name: Shek, Lydia L. M.
Publisher: name: University of British Columbia
Year: 2010

description: Prognostic indicators, measured at diagnosis, are important in breast cancer. They help clinicians select optimal treatment, provide rational bases for stratification of treatment trials and assist analysis of response to treatment. Univariate statistical survival curves have identified many such indicators. However, they do not explain why some patients, classified as favoured by one or other factor(s), experience early treatment failure, nor why a substantial number with unfavourable signs remain recurrence-free many years later. This study was undertaken to identify independent prognostic factors with the use of multivariate regression. A Cox proportional hazards model of disease-specific survival was based on 1184 primary breast cancer patients referred to the Cancer Control Agency of B.C. between 1975 and 1981 (median follow-up 60 months). Significant univariate associations with overall survival were found for estrogen receptor concentration ([ER]), axillary nodal status (NO, Nl-3, N4+), clinical stage (TNM I, II, III, IV), histologic differentiation and confluent tumor necrosis (minimal, marked). These factors were assessed at primary diagnosis. A subset of 859 patients with complete data on these variables and also histologic type, menopausal status, age, tumor size and treatment was used to fit the multivariate model. Nodal status was the most important independent factor but three others, TNM stage, [ER] and tumor necrosis, were needed to make adequate predictions. A derived Hazard Index defined risk groups with 8-fold variation in survival. Five-year predicted survival ranged from 36% (N4+, loge[ER]=0, marked necrosis) to 96% (NO, loge[ER]=6, no necrosis) with TNM I and 0% to 70% for the same categories in TNM IV. This wide variation occurred across all stages. Study of post-recurrence survival (369 patients) yielded a model with only three independent predictors: [ER], nodal status and tumor necrosis. Survival - overall, recurrence-free and post-recurrent - is predictable by modelling a few factors measureable at diagnosis. Use of ER concentration, rather than the more common ER status (+ or -), greatly strengthens the model. Presence of ER was also shown to be increasingly important as 'protective', attenuating the effect of other factors, as risk of mortality increases.
Uranus' hidden narrow rings
Creators: name: Hedman, M. M.
name: Chancia, R. O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In addition to its suite of narrow dense rings, Uranus is surrounded by an extremely complex system of dusty rings that were most clearly seen by the Voyager spacecraft after it flew past the planet. A new analysis of the highest resolution images of these dusty rings reveals that a number of them are less than 20 km wide. The extreme narrowness of these rings, along with the fact that most of them do not appear to fall close to known satellite resonances, should provide new insights into the forces responsible for sculpting the Uranian ring system.
description: 17 Pages, 10 Figures, Accepted for publication in the Planetary Science Journal, Revised to reflect corrections made at proof stage
Feedback in the local LBG Analog Haro 11 as probed by far-UV and X-ray observations
Creators: name: Grimes, J. P.
name: Heckman, T.
name: Strickland, D.
name: Dixon, W. V.
name: Sembach, K.
name: Overzier, R.
name: Hoopes, C.
name: Aloisi, A.
name: Ptak, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have re-analyzed FUSE data and obtained new Chandra observations of Haro 11, a local (D_L=88 Mpc) UV luminous galaxy. Haro 11 has a similar far-UV luminosity (10^10.3 L_\odot), UV surface brightness (10^9.4 L_\odot kpc^-2), SFR, and metallicity to that observed in Lyman Break Galaxies (LBGs). We show that Haro 11 has extended, soft thermal (kT~0.68 keV) X-ray emission with a luminosity and size which scales with the physical properties (e.g. SFR, stellar mass) of the host galaxy. An enhanced alpha/Fe, ratio of ~4 relative to solar abundance suggests significant supernovae enrichment. These results are consistent with the X-ray emission being produced in a shock between a supernovae driven outflow and the ambient material. The FUV spectra show strong absorption lines similar to those observed in LBG spectra. A blueshifted absorption component is identified as a wind outflowing at ~200-280 km/s. OVIλ\lambda1032,1038 emission, the dominant cooling mechanism for coronal gas at T~10^5.5 K is also observed. If associated with the outflow, the luminosity of the OVI emission suggests that <20% of the total mechanical energy from the supernovae and solar winds is being radiated away. This implies that radiative cooling through OVI is not significantly inhibiting the growth of the outflowing gas. In contradiction to the findings of Bergvall et al 2006, we find no convincing evidence of Lyman continuum leakage in Haro 11. We conclude that the wind has not created a `tunnel' allowing the escape of a significant fraction of Lyman continuum photons and place a limit on the escape fraction of f_{esc}<2%. Overall, both Haro 11 and a previously observed LBG analogue VV 114, provide an invaluable insight into the X-ray and FUV properties of high redshift LBGs.
description: Accepted for publication in ApJ, 40 pages, 17 figures
Effective interactions from q-deformed inspired transformations
Creators: name: Timoteo, V. S.
name: Lima, C. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: From the mass term for the transformed quark fields, we obtain effective contact interactions of the NJL type. The parameters of the model that maps a system of non-interacting transformed fields into quarks interacting via NJL contact terms are discussed.
Self-collision of a portal wormhole
Creators: name: Feng, Justin C.
name: Lemos, José P. S.
name: Matzner, Richard A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the self-collision of portals in classical general relativity. Portals are wormholes supported by a single loop of negative mass cosmic string, and being wormholes, portals have a nontrivial topology. Portals can be constructed so that the curvature is zero everywhere outside the cosmic string, with vanishing ADM mass. The conical singularities of these wormholes can be smoothed, yielding a spatial topology of $S^2 \times S^1$ with a point corresponding to spatial infinity removed. If one attempts to collide the mouths of a smoothed portal to induce self-annihilation, one naively might think that a Euclidean topology is recovered, which would violate the classical no topology change theorems. We consider a particular limit of smoothed portals supported by an anisotropic fluid, and find that while the portal mouths do not experience an acceleration as they are brought close together, a curvature singularity forms in the limit that the separation distance vanishes. We find that in general relativity, the interaction between portal mouths is not primarily gravitational in nature, but depends critically on matter interactions.
description: 12 pages, 8 figures
Beyond the Usual Suspects: Building a 21st Century Reading Community in Scotland
Creators: name: Byrne, Ines
Publisher: name: Zenodo
Year: 2019

description: In the context of the development of national and international digital scholarship communities and the emergence of text and data mining (TDM) tools, library labs, and library carpentry services, there is growing research capacity with regard to digital scholarship in academic institutions. However, there is no comparable forum in Scotland that brings together other key stakeholder groups, such as digital industry; the wider gallery, library, archive and museum (GLAM) community; and, perhaps most crucially, independent researchers, creatives, and practitioners.

In preparation for the appointment of its first dedicated Digital Scholarship Librarian in early 2019, the National Library of Scotland found itself in the fortunate position of being able to learn from other digital scholarship services, while at the same time seeking to ensure that its efforts and services remain relevant to more than just the ‘usual suspects’, by aiming to expand beyond the traditional digital scholarship link between libraries and academic scholars.

Home to circa 5 million digital collection items (growing by hundreds of thousands every year), the Library therefore decided to address this lack of cross-sector connection by running a year-long engagement programme of “21st century reading” workshops on TDM skills throughout 2018. The fundamental position upon which these workshops were based was the understanding that collaboration is essential so that researchers, developers, GLAMs, and independent innovators are able to discover what they can offer each other, what they need from each other, and what they can potentially achieve together.

The intention of the series, which was run in collaboration with the University of Glasgow and with funding from the Royal Society of Edinburgh, was to bring the four stakeholder groups (academia, GLAM, industry, and independents) together to query the current state of awareness and ability regarding TDM within Scotland, to explore the potential for wider communities to make use of these approaches to knowledge and data, and to investigate how massive text collections of cultural heritage organisations can be exposed to researchers both outside, as well as within academic institutions.

Based on findings from the workshop series, this paper will outline the often underrepresented stakeholder-diversity driven approach to setting up a dedicated large-scale digital scholarship programme at a national institution, and discuss the impact such an approach can have on the different stakeholder groups. It will give an insight into the successes and challenges faced throughout the workshop series, as well as the consequent lessons learned.

[This paper would be of interest to those at a similar or earlier stage of digital scholarship development, to hear about lessons learned regarding the stakeholder-diversity approach taken by the National Library of Scotland.]
CONTRIBUIÇÃO AO PROCESSO DE MENSURAÇÃO DE ATIVOS IMOBILIZADOS POR MEIO DO FAIR VALUE E DO IMPAIRMENT TEST
Creators: name: Raupp, Fabiano Maury
name: Beuren, Ilse Maria
Publisher: name: Revista de Informação Contábil
Year: 2009
Subjects: Ativos Imobilizados, Fair Value, Impairment Test.

description: O artigo objetiva analisar o processo de mensuração do valor econômico de ativos imobilizados tendo por base a integração do fair value e do impairment test. Trata-se de um estudo exploratório, realizado por meio de pesquisa bibliográfica, com abordagem qualitativa. O artigo está estruturado de modo que inicialmente apresenta a justificativa do estudo e os procedimentos metodológicos utilizados. Em seguida aborda os conceitos de fair value accounting e impairment test, bem como sua integração. Depois discorre sobre a mensuração do valor econômico de ativos imobilizados na perspectiva do fair value e do impairment test com ênfase na proposição de etapas para a integração. Por fim, para demonstrar a viabilidade da proposta, simula uma situação de mensuração de um item do ativo imobilizado, elucidando com valores numéricos, a integração dos dois conceitos, observadas as respectivas etapas de sua aplicação, além de apresentar as conclusões do estudo.
description: Revista de Informação Contábil, v. 3, n. 2 (2009): RIC/UFPE - Revista de Informação Contábil
Lithium in LP 944-20
Creators: name: Pavlenko, Ya. V.
name: Jones, H. R. A.
name: Martin, E. L.
name: Guenther, E.
name: Kenworthy, M. A.
name: Osorio, M. R. Zapatero
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new estimate of the lithium abundance in the atmosphere of the brown dwarf LP 944-20. Our analysis is based on a self-consistent analysis of low, intermediate and high resolution optical and near-infrared spectra. We obtain log N(Li) = 3.25 +/-0.25 using fits of our synthetic spectra to the Li I resonance line doublet profiles observed with VLT/UVES and AAT/SPIRAL. This lithium abundance is over two orders of magnitude larger than previous estimates in the literature. In order to obtain good fits of the resonance lines of K I and Rb I and better fits to the TiO molecular absorption around the Li I resonance line, we invoke a semi-empirical model atmosphere with the dusty clouds located above the photosphere. The lithium abundance, however, is not changed by the effects of the dusty clouds. We discuss the implications of our estimate of the lithium abundance in LP 944-20 for the understanding of the properties of this benchmark brown dwarf.
description: 14 pages, 17 figs, accepted by MNRAS (upgraded version)
Magnetospectroscopy of epitaxial few-layer graphene
Creators: name: Sadowski, M. L.
name: Martinez, G.
name: Potemski, M.
name: Berger, C.
name: de Heer, W. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The inter-Landau level transitions observed in far-infrared transmission experiments on few-layer graphene samples show a behaviour characteristic of the linear dispersion expected in graphene. This behaviour persists in relatively thick samples, and is qualitatively different from that of thin samples of bulk graphite.
description: Invited short review to appear in a special issue of Solid State Communications
Phase Transitions of S=1 Spinor Condensates in an Optical Lattice
Creators: name: Podolsky, Daniel
name: Chandrasekharan, Shailesh
name: Vishwanath, Ashvin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the phase diagram of spin-one polar condensates in a two dimensional optical lattice with magnetic anisotropy. We show that the topological binding of vorticity to nematic disclinations allows for a rich variety of phase transitions. These include Kosterlitz-Thouless-like transitions with a superfluid stiffness jump that can be experimentally tuned to take a continuous set of values, and a new cascaded Kosterlitz-Thouless transition, characterized by two divergent length scales. For higher integer spin bosons S, the thermal phase transition out of the planar polar phase is strongly affected by the parity of S.
description: 9 pages, 7 figures; v4 - Expanded manuscript
Dust Formation and Survival in Supernova Ejecta
Creators: name: Bianchi, S.
name: Schneider, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The presence of dust at high redshift requires efficient condensation of grains in SN ejecta, in accordance with current theoretical models. Yet, observations of the few well studied SNe and SN remnants imply condensation efficiencies which are about two orders of magnitude smaller. Motivated by this tension, we have (i) revisited the model of Todini & Ferrara (2001) for dust formation in the ejecta of core collapse SNe and (ii) followed, for the first time, the evolution of newly condensed grains from the time of formation to their survival - through the passage of the reverse shock - in the SN remnant. We find that 0.1 - 0.6 M_sun of dust form in the ejecta of 12 - 40 M_sun stellar progenitors. Depending on the density of the surrounding ISM, between 2-20% of the initial dust mass survives the passage of the reverse shock, on time-scales of about 4-8 x 10^4 yr from the stellar explosion. Sputtering by the hot gas induces a shift of the dust size distribution towards smaller grains. The resulting dust extinction curve shows a good agreement with that derived by observations of a reddened QSO at z =6.2. Stochastic heating of small grains leads to a wide distribution of dust temperatures. This supports the idea that large amounts (~ 0.1 M_sun) of cold dust (T ~ 40K) can be present in SN remnants, without being in conflict with the observed IR emission.
description: MNRAS accepted
Riemann-Hilbert problem associated to Frobenius manifold structures on Hurwitz spaces: irregular singularity
Creators: name: Shramchenko, Vasilisa
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Solutions to the Riemann-Hilbert problems with irregular singularities naturally associated to semisimple Frobenius manifold structures on Hurwitz spaces (moduli spaces of meromorphic functions on Riemann surfaces) are constructed. The solutions are given in terms of meromorphic bidifferentials defined on the underlying Riemann surface. The relationship between different classes of Frobenius manifold structures on Hurwitz spaces (real doubles, deformations) is described on the level of the corresponding Riemann-Hilbert problems.
description: 41 page, 11 figures
Preferential interaction coefficient for nucleic acids and other cylindrical poly-ions
Creators: name: Trizac, E.
name: Tellez, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The thermodynamics of nucleic acid processes is heavily affected by the electric double-layer of micro-ions around the polyions. We focus here on the Coulombic contribution to the salt-polyelectrolyte preferential interaction (Donnan) coefficient and we report extremely accurate analytical expressions valid in the range of low salt concentration (when polyion radius is smaller than the Debye length). The analysis is performed at Poisson-Boltzmann level, in cylindrical geometry, with emphasis on highly charged poly-ions (beyond ``counter-ion condensation''). The results hold for any electrolyte of the form $z_-$:$z_+$. We also obtain a remarkably accurate expression for the electric potential in the vicinity of the poly-ion.
The Dissociation of 8B in the Coulomb Field and the Validity of the CD Method
Creators: name: Gai, Moshe
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The GSI1, GSI2 (as well as the RIKEN2 and the corrected GSI2) measurements of the Coulomb Dissociation (CD) of 8B are in good agreement with the most recent Direct Capture (DC) 7Be(p,g)8B reaction measurement performed at Weizmann and in agreement with the Seattle result. Yet it was claimed that the CD and DC results are sufficiently different and need to be reconciled. We show that these statements arise from a misunderstanding (as well as misrepresentation) of CD experiments. We recall a similar strong statement questioning the validity of the CD method due to an invoked large E2 component that was also shown to arise from a misunderstanding of the CD method. In spite of the good agreement between DC and CD data the slope of the astrophysical cross section factor (S17) can not be extracted with high accuracy due to a discrepancy between the recent DC data as well as a discrepancy of the three reports of the GSI CD data. The slope is directly related to the d-wave component that dominates at higher energies and must be subtracted from measured data to extrapolate to zero energy. Hence the uncertainty of the measured slope leads to an additional uncertainty of the extrapolated zero energy cross section factor, S17(0). This uncertainty must be alleviated by future experiments to allow a precise determination of S17(0), a goal that so far has not be achieved in spite of strong statement(s) that appeared in the literature.
description: Invited Talk, Spring Seminar on Nuclear Physics, May 20 - 24, 2007, Vico Equense, Italy. Work Supported by USDOE grant No. DE-FG02-94ER40870
Dependence of ground state energy of classical n-vector spins on n
Creators: name: Chandra, Samarth
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the ground state energy E_G(n) of N classical n-vector spins with the hamiltonian H = - \sum_{i>j} J_ij S_i.S_j where S_i and S_j are n-vectors and the coupling constants J_ij are arbitrary. We prove that E_G(n) is independent of n for all n > n_{max}(N) = floor((sqrt(8N+1)-1) / 2) . We show that this bound is the best possible. We also derive an upper bound for E_G(m) in terms of E_G(n), for mj} |J_ij| + E_G(n)) / (\sum_{i>j} |J_ij|). We describe a procedure for constructing a set of J_ij's such that an arbitrary given state, {S_i}, is the ground state.
description: 6 pages, 2 figures, submitted to Physical Review E
Symmetry protected self correcting quantum memory in three space dimensions
Creators: name: Stahl, Charles
name: Nandkishore, Rahul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Whether self correcting quantum memories can exist at non-zero temperature in a physically reasonable setting remains a great open problem. It has recently been argued [1] that symmetry protected topological (SPT) systems in three space dimensions subject to a strong constraint -- that the quantum dynamics respect a 1-form symmetry -- realize such a quantum memory. We illustrate how this works in Walker-Wang codes, which provide a specific realization of these desiderata. In this setting we show that it is sufficient for the 1-form symmetry to be enforced on a sub-volume of the system which is measure zero in the thermodynamic limit. This strongly suggests that the `SPT' character of the state is not essential. We confirm this by constructing an explicit example with a trivial (paramagnetic) bulk that realizes a self correcting quantum memory. We therefore show that the enforcement of a 1-form symmetry on a measure zero sub-volume of a three dimensional system can be sufficient to stabilize a self correcting quantum memory at non-zero temperature.
description: 10 pages, 9 figures
Cahiers de lexicologie. 1977-2, n° 31
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2012
Subjects: subject: Lexique
subject: Lexicographie
subject: Sémantique
subject: Traduction
subject: Linguistique historique

description: Les Cahiers de lexicologie, revue internationale de lexicologie et de lexicographie, s'intéressent au lexique dans ses relations avec les autres composantes de la langue (syntaxe, sémantique, morphologie, phonologie, discours…), tant du point de vue théorique que de leurs applications, notamment pour ce qui concerne le traitement informatique de la langue.
description: The Cahiers de lexicologie, international review of lexicology and lexicography, studies vocabulary in its relation to other aspects of language (syntax, semantics, morphology, phonology, speech...), both from a theoretical point of view and in practical applications, notably concerning computer treatment of language.
Analysis of the real estate market in Las Vegas: Bubble, seasonal patterns, and prediction of the CSW indexes
Creators: name: Zhou, Wei-Xing
name: Sornette, Didier
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Finance (q-fin.GN)
subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We analyze 27 house price indexes of Las Vegas from Jun. 1983 to Mar. 2005, corresponding to 27 different zip codes. These analyses confirm the existence of a real-estate bubble, defined as a price acceleration faster than exponential, which is found however to be confined to a rather limited time interval in the recent past from approximately 2003 to mid-2004 and has progressively transformed into a more normal growth rate comparable to pre-bubble levels in 2005. There has been no bubble till 2002 except for a medium-sized surge in 1990. In addition, we have identified a strong yearly periodicity which provides a good potential for fine-tuned prediction from month to month. A monthly monitoring using a model that we have developed could confirm, by testing the intra-year structure, if indeed the market has returned to ``normal'' or if more turbulence is expected ahead. We predict the evolution of the indexes one year ahead, which is validated with new data up to Sep. 2006. The present analysis demonstrates the existence of very significant variations at the local scale, in the sense that the bubble in Las Vegas seems to have preceded the more global USA bubble and has ended approximately two years earlier (mid 2004 for Las Vegas compared with mid-2006 for the whole of the USA).
description: 24 Elsart pages including 13 pages and 1 table
Search for direct CP violating charge asymmetries in $K^\pm\toπ^\pmπ^+π^-$ and $K^\pm\toπ^\pmπ^0π^0$ decays
Creators: name: Batley, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes $A_g=(g^+-g^-)/(g^++g^-)$ in $K^\pm\toπ^\pmπ^+π^-$ and $K^\pm\toπ^\pmπ^0π^0$ decays by the NA48/2 experiment at CERN SPS is presented. A new technique of asymmetry measurement involving simultaneous $K^+$ and $K^-$ beams and a large data sample collected allowed a result of an unprecedented precision. The charge asymmetries were measured to be $A^c_g=(-1.5\pm2.2)\times10^{-4}$ with $3.11\times 10^9$ $K^{\pm}\toπ^\pmπ^+π^-$ decays, and $A^n_g=(1.8\pm1.8)\times10^{-4}$ with $9.13\times 10^7$ $K^{\pm}\toπ^\pmπ^0π^0$ decays. The precision of the results is limited mainly by the size of the data sample.
description: 29 pages, 9 figures. An updated version accepted by the EPJC
Self-agency and asylum
Creators: name: McAuliffe, Marie
Publisher: name: The Australian National University
Year: 2017
Subjects: Asylum
refugee
irregular migration
Hazara

description: In recent years, large numbers of people have embarked on high-risk sea journeys attempting to reach specific destinations, including Australia, Greece, Italy, Spain, Malaysia, Thailand and the United States. In 2015, for example, over 850,000 people crossed the Aegean Sea from Turkey to Greece, with many continuing their journeys to eventually reach other parts of Europe (mostly Germany, Sweden and Austria). Just over half were Syrian refugees who had been living in Turkey, with Afghans, Iraqis, Pakistanis, Iranians and a multitude of others making up the remainder. Thousands of people perish en route every year while undertaking irregular maritime migration, and many more are exploited and abused during their perilous journeys. Added to this are the long-distances some must cover, particularly those from the Middle East and South Asia travelling to Australia. This study examines the nature and extent of self-agency of irregular maritime asylum seekers. In doing so, it focuses on a population of maritime asylum seekers who, at face value, were able to exercise agency and realise the goal of seeking asylum in Australia. Using survey and statistical data on irregular maritime asylum seekers who arrived in Australia over five program years (June 2008 to July 2013), the analysis finds strong complementarities among migration patterns of asylum seekers from different countries and ethnic backgrounds. The migration patterns and processes of a subset are examined more deeply in a case study on Hazara asylum seekers who travelled to Australia from Afghanistan, Pakistan and Iran. Through the application of a multi-faceted model of asylum seeker agency, the study finds that a small but significant group of ‘proactive asylum seekers’ were far from passive, exercising considerable agency in determining when, how, where and with whom they migrated. However, considerable limitations on agency were evident—particularly for females and young Hazaras—resulting in highly skewed migration patterns and very specific and sometimes singular migration processes being manifested. The study also found indications that Hazaras had applied similar migration strategies that had been developed within the West Asia region during previous decades of displacement and migration.
DATA_PRF2021_Chauchat
Creators: name: Julien, Chauchat
name: Revil-Baudard Thibaud
name: Hurther David
name: Zhen, Cheng
name: Hsu Tian-Jian (Tom)
Publisher: name: Zenodo
Year: 2021
Subjects: Sediment transport
Suspended load
Turbulent Sclmidt Number

description: The repository contains 2 netcdf files, the file PRF2021_ChauchatEtAl.nc contains sheet-flow experimental data from Revil-Baudard et al. (JFM 2015, 2016) as well as two-fluid LES data by Cheng et al. (AWR 2018) using sedFOAM. The file ShenDataPRF.nc contains experimental data from Shen and Lemmin (JHR 1999). The folder Lyn2008 contains the data for Schmidt number gathered by Lyn (2008). The python script figuresPRFnc.py allows to read the data and make the figures from the article Chauchat et al. (PRF 2021).
BENEFÍCIOS PERCEBIDOS NA ADEQUAÇÃO À LEI SARBANES-OXLEY: UM ESTUDO EMPÍRICO DA PERCEPÇÃO DOS GESTORES EM UMA EMPRESA DE ENERGIA ELÉTRICA
Creators: name: Lélis, Débora Lage Martins
name: Pinheiro, Laura Edith Taboada
Publisher: name: Revista de Informação Contábil
Year: 2009
Subjects: Controles Internos; Lei Sarbanes-Oxley; Auditoria Interna; Processos.

description: O artigo avalia as mudanças trazidas pela lei americana Sarbanes-Oxley a uma empresa brasileira com ações negociadas nos Estados Unidos, com o objetivo de verificar a existência de benefícios decorrentes da aderência à lei. O estudo revisa bibliografia sobre o tema e apresenta o caso da implantação da nova estrutura de controles internos pela Companhia Energética de Minas Gerais – CEMIG, para atendimento à SOX, detalhando as etapas do projeto de implantação dos controles e questionando se o fortalecimento dessa estrutura pode trazer melhorias aos processos de negócio. A pesquisa foi realizada através de estudo exploratório, com a utilização de fontes primárias, com abordagem lógica dedutiva. Os gestores da empresa passaram por entrevistas não estruturadas e responderam a um questionário fechado, para avaliação de sua percepção sobre os benefícios que a nova estrutura de controles internos trouxe aos processos de negócio e sobre a relação custo-benefício da implantação dos controles. Foi acompanhado o dia-a-dia dos analistas da gerência de controles internos junto com as áreas afetadas, como mecanismo de triangulação. O resultado do estudo revelou a percepção da maioria dos benefícios questionados, como maior atuação da auditoria interna e melhor documentação de processos e controles, dentre outros. A maior parte dos entrevistados também acredita que os benefícios associados serão maiores que os custos da estrutura de controles, especialmente a partir do segundo ano de implementação.
description: Revista de Informação Contábil, v. 3, n. 2 (2009): RIC/UFPE - Revista de Informação Contábil
A Low Complexity Algorithm and Architecture for Systematic Encoding of Hermitian Codes
Creators: name: Agarwal, Rachit
name: Koetter, Ralf
name: Popovici, Emanuel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We present an algorithm for systematic encoding of Hermitian codes. For a Hermitian code defined over GF(q^2), the proposed algorithm achieves a run time complexity of O(q^2) and is suitable for VLSI implementation. The encoder architecture uses as main blocks q varying-rate Reed-Solomon encoders and achieves a space complexity of O(q^2) in terms of finite field multipliers and memory elements.
description: 5 Pages, Accepted in IEEE International Symposium on Information Theory ISIT 2007
Cahiers de lexicologie. 1980-1, n° 36
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2012
Subjects: subject: Lexique
subject: Lexicographie
subject: Sémantique
subject: Traduction
subject: Linguistique historique

description: Les Cahiers de lexicologie, revue internationale de lexicologie et de lexicographie, s'intéressent au lexique dans ses relations avec les autres composantes de la langue (syntaxe, sémantique, morphologie, phonologie, discours…), tant du point de vue théorique que de leurs applications, notamment pour ce qui concerne le traitement informatique de la langue.
description: The Cahiers de lexicologie, international review of lexicology and lexicography, studies vocabulary in its relation to other aspects of language (syntax, semantics, morphology, phonology, speech...), both from a theoretical point of view and in practical applications, notably concerning computer treatment of language.
Cahiers de lexicologie. 1981-1, n° 38
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2012
Subjects: subject: Lexique
subject: Lexicographie
subject: Sémantique
subject: Traduction
subject: Linguistique historique

description: Les Cahiers de lexicologie, revue internationale de lexicologie et de lexicographie, s'intéressent au lexique dans ses relations avec les autres composantes de la langue (syntaxe, sémantique, morphologie, phonologie, discours…), tant du point de vue théorique que de leurs applications, notamment pour ce qui concerne le traitement informatique de la langue.
description: The Cahiers de lexicologie, international review of lexicology and lexicography, studies vocabulary in its relation to other aspects of language (syntax, semantics, morphology, phonology, speech...), both from a theoretical point of view and in practical applications, notably concerning computer treatment of language.
Ideals in the ring of Colombeau generalized numbers
Creators: name: Vernaeve, Hans
Publisher: name: arXiv
Year: 2007
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16D25, 46F30

description: In this paper, the structure of the ideals in the ring of Colombeau generalized numbers is investigated. Connections with the theories of exchange rings, Gelfand rings and lattice-ordered rings are given. Characterizations for prime, projective, pure and topologically closed ideals are given, answering in particular the questions about prime ideals in [Aragona-Juriaans]. Also z-ideals in the sense of [Mason] are characterized. The quotient rings modulo maximal ideals are shown to be canonically isomorphic with nonstandard fields of asymptotic numbers. Finally, a detailed study of the ideals allows us to prove that (under some set-theoretic assumption) the Hahn-Banach extension property does not hold for a large class of topological modules over the ring of Colombeau generalized numbers.
Spin coherence of holes in GaAs/AlGaAs quantum wells
Creators: name: Syperek, M.
name: Yakovlev, D. R.
name: Greilich, A.
name: Misiewicz, J.
name: Bayer, M.
name: Reuter, D.
name: Wieck, A. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The carrier spin coherence in a p-doped GaAs/(Al,Ga)As quantum well with a diluted hole gas has been studied by picosecond pump-probe Kerr rotation with an in-plane magnetic field. For resonant optical excitation of the positively charged exciton the spin precession shows two types of oscillations. Fast oscillating electron spin beats decay with the radiative lifetime of the charged exciton of 50 ps. Long lived spin coherence of the holes with dephasing times up to 650 ps. The spin dephasing time as well as the in-plane hole g factor show strong temperature dependence, underlining the importance of hole localization at cryogenic temperatures.
description: 5 pages, 4 figures in PostScript format
Diffusion Processes in Turbulent Magnetic Fields
Creators: name: Lazarian, Alex
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study of the effect of turbulence on diffusion processes within magnetized medium. While we exemplify our treatment with heat transfer processes, our results are quite general and are applicable to different processes, e.g. diffusion of heavy elements. Our treatment is also applicable to describing the diffusion of cosmic rays arising from magnetic field wandering. In particular, we find that when the energy injection velocity is smaller than the Alfven speed the heat transfer is partially suppressed, while in the opposite regime the effects of turbulence depend on the intensity of driving. In fact, the scale $l_A$ at which the turbulent velocity is equal the Alfven velocity is a new important parameter. When the electron mean free path $λ$ is larger than $l_A$, the stronger the the turbulence, the lower thermal conductivity by electrons is. The turbulent motions, however, induces their own advective transport, that can provide effective diffusivity. For clusters of galaxies, we find that the turbulence is the most important agent for heat transfer. We also show that the domain of applicability of the subdiffusion concept is rather limited.
description: 3 figures, 11 pages, to be published in AIP volume of "Turbulence and Non-linear Processes in Astrophysical Plasmas"
Search for a fourth generation b'-quark at LEP-II at sqrt{s}=196-209 GeV
Creators: name: The DELPHI Collaboration
name: Abdallah, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for the pair production of fourth generation b'-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to 209 GeV, corresponding to an integrated luminosity of 420 pb^{-1}. No evidence for a signal was found. Upper limits on BR(b' -> bZ) and BR(b' -> cW) were obtained for b' masses ranging from 96 to 103 GeV/c^2. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of R_{CKM}=|V_{cb'}/V_{tb'}V_{tb}|, where V_{cb'}, V_{tb'} and V_{tb} are elements of the extended CKM matrix.
description: 26 pages, 12 figures, Accepted by Eur. Phys. J. C
INCENTIVO À PESQUISA CIENTÍFICA DURANTE A GRADUAÇÃO EM CIÊNCIAS CONTÁBEIS: UM ESTUDO NAS UNIVERSIDADES DO ESTADO DO RIO GRANDE DO SUL .
Creators: name: Machado, Daiane Pias
name: Machado, Débora Gomes
name: Souza, Marcos Antonio
name: Silva, Rogério Piva
Publisher: name: Revista de Informação Contábil
Year: 2009
Subjects: subject: graduação em ciências contábeis, incentivo a pesquisa, pesquisa em contabilidade.
subject: Educação e Pesquisa

description: O objetivo do estudo é investigar se os acadêmicos dos cursos de graduação em Ciências Contábeis são incentivados a realizar pesquisas científicas. Trata-se de uma survey, com abordagem qualitativa e quantitativa na análise dos dados. Foram pesquisadas as universidades localizadas no Estado do Rio Grande do Sul, cuja coleta de dados deu-se pela aplicação de um questionário entre os coordenadores dos referidos cursos. A análise quantitativa dos dados ocorreu com a aplicação do método dos mínimos quadrados ordinários. As principais conclusões indicam que o incentivo para a realização de pesquisa científica está presente em 46% das IES, e que a concessão de bolsas de iniciação científica é o principal estímulo. Baseado nos resultados da regressão estimou-se que o impacto do apoio financeiro nas publicações é elástico, ou seja, para cada 1 de incremento nos recursos destinados a apoio financeiro as pesquisas aumentam 1,48 vezes.
description: Revista de Informação Contábil, v. 3, n. 2 (2009): RIC/UFPE - Revista de Informação Contábil
Detection of the magneto-structural phase coexistence in MnAs epilayers at a very early stage
Creators: name: Milano, J.
name: Steren, L. B.
name: Llamazares, A. H. V. Repetto
name: Garcia, V.
name: Marangolo, M.
name: Eddrief, M.
name: Etgens, V. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on the appearance of magnetic stripes in MnAs/GaAs(100) epilayers at temperatures well below the ferromagnetic transition of the system. The study has been performed by ferromagnetic resonance experiments (FMR) on MnAs epilayers grown on (100) and (111) GaAs substrates. The FMR spectra of the MnAs/GaAs(100) samples at 180 K reveal the appearance of zones of different magnetic behavior with respect to the low-temperature homogeneous ferromagnetic phase. The angular and the temperature dependence of the spectra serve us to detect the inter-growth of the non-magnetic phase into the ferromagnetic phase at a very early stage of the process. The experimental data show that the new phase nucleates in a self-arranged array of stripes in MnAs/GaAs(100) thin films while it grows randomly in the same films grown on GaAs(111).
description: 8 pages, 5 figures