cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The major mechanism to drive turbulence in star-forming galaxies
Creators: name: Yu, Xiaoling
name: Bian, Fuyan
name: Krumholz, Mark R.
name: Shi, Yong
name: Li, Songlin
name: Chen, Jianhang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Two competing models, gravitational instability-driven transport and stellar feedback, have been proposed to interpret the high velocity dispersions observed in high-redshift galaxies. We study the major mechanisms to drive the turbulence in star-forming galaxies using a sample of galaxies from the xCOLD GASS survey, selected based on their star-formation rate (SFR) and gas fraction to be in the regime that can best distinguish between the proposed models. We perform Wide Field Spectrograph (WiFeS) integral field spectroscopic (IFS) observations to measure the intrinsic gas velocity dispersions, circular velocities and orbital periods in these galaxies. Comparing the relation between the SFR, velocity dispersion, and gas fraction with predictions of these two theoretical models, we find that our results are most consistent with a model that includes both transport and feedback as drivers of turbulence in the interstellar medium. By contrast, a model where stellar feedback alone drives turbulence under-predicts the observed velocity dispersion in our galaxies, and does not reproduce the observed trend with gas fraction. These observations therefore support the idea that gravitational instability makes a substantial contribution to turbulence in high redshift and high SFR galaxies.
description: 9 pages, 4 figures, accepted for publication in MNRAS
Bright Matter-Wave Soliton Collisions in a Harmonic Trap: Regular and Chaotic Dynamics
Creators: name: Martin, A. D.
name: Adams, C. S.
name: Gardiner, S. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Collisions between bright solitary waves in the 1D Gross-Pitaevskii equation with a harmonic potential, which models a trapped atomic Bose-Einstein condensate, are investigated theoretically. A particle analogy for the solitary waves is formulated, which is shown to be integrable for a two-particle system. The extension to three particles is shown to support chaotic regimes. Good agreement is found between the particle model and simulations of the full wave dynamics, suggesting that the dynamics can be described in terms of solitons both in regular and chaotic regimes, thus presenting a paradigm for chaos in wave-mechanics.
description: 4 pages, 3 figures, content changed in response to referee comments, references added
The structure of the nuclear stellar cluster of the Milky Way
Creators: name: Schoedel, R.
name: Eckart, A.
name: Alexander, T.
name: Merritt, D.
name: Genzel, R.
name: Sternberg, A.
name: Meyer, L.
name: Kul, F.
name: Moultaka, J.
name: Ott, T.
name: Straubmeier, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present high-resolution seeing limited and AO NIR imaging observations of the stellar cluster within about one parsec of Sgr A*, the massive black hole at the centre of the Milky Way. Stellar number counts and the diffuse background light density were extracted from these observations in order to examine the structure of the nuclear stellar cluster.Our findings are as follows: (a) A broken-power law provides an excellent fit to the overall structure of the GC nuclear cluster. The power-law slope of the cusp is $Γ=0.19\pm0.05$, the break radius is $R_{\rm break} = 6.0'' \pm 1.0''$ or $0.22\pm0.04$ pc, and the cluster density decreases with a power-law index of $Γ=0.75\pm0.1$ outside of $R_{\rm break}$. (b) Using the best velocity dispersion measurements from the literature, we derive higher mass estimates for the central parsec than assumed until now. The inferred density of the cluster at the break radius is $2.8\pm1.3\times 10^{6} {\rm M_{\odot} pc^{-3}}$. This high density agrees well with the small extent and flat slope of the cusp. Possibly, the mass of the stars makes up only about 50% of the total cluster mass. (c) Possible indications of mass segregation in the cusp are found (d) The cluster appears not entirely homogeneous. Several density clumps are detected that are concentrated at projected distances of $R=3''$ and $R=7''$ from Sgr A*.(e) There appears to exist an under-density of horizontal branch/red clump stars near $R=5''$, or an over-density of stars of similar brightness at $R=3''$ and $R=7''$. (f) The extinction map in combination with cometary-like features in an L'-band image may provide support for the assumption of an outflow from Sgr A*.
description: accepted for publication by A&A; please contact first author for higher quality figures
Combining text mining and author participation to improve curation at WormBase
Creators: name: Arnaboldi, Valerio
name: Raciti, Daniela
name: Auken, Kimberly Van
name: Juancarlos Chan
name: Hans-Michael Muller
name: Sternberg, Paul W
Publisher: name: F1000 Research Limited
Year: 2019

description: Biological databases rely on expert biocuration of the primary research literature to maintain an up-to-date collection of data organized in a machine-readable form. In order to enter information into databases curators need to: i) identify papers containing relevant data for curation, a process called triaging; ii) recognize named entities; and iii) extract data. WormBase (WB), the authoritative repository for research data on the biology, genetics and genomics of Caenorhabditis elegans and other nematodes, uses various Text Mining (TM) approaches on full text to automate, or semi-automate, each aspect of the curatorial pipeline. In addition, we engage authors, via an Author First Pass (AFP) pipeline, to help classify data types and entities in their recently published papers. We will present how we are combining TM and AFP into a single application to enhance community curation at WB. Specifically, we use string-searching algorithms and statistical methods (e.g. Support Vector Machines (SVMs)) to extract biological entities and flag data types, respectively, and present the results of these methods to authors in a web-based form. With this new approach, authors simply need to validate the results of machine-based pipelines, rather than enter all information de novo. By combining these previously separate pipelines, we hope to lessen the participatory burden for authors, while at the same time receive valuable feedback on the performance of our TM tools. Wherever possible, we are also providing links from the new AFP interface to structured data submission forms, e.g. phenotypes and expression patterns, giving authors the opportunity to contribute more detailed curation that can be incorporated into WB with minimal curator review. Our approach is generalizable and thus could readily be applied to additional literatures and databases that would like to engage their user
community in assisting with curation.
Dicke effect in a quantum wire with side-coupled quantum dots
Creators: name: Orellana, P. A.
name: Dominguez-Adame, F.
name: Diez, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A system of an array of side-coupled quantum-dots attached to a quantum wire is studied theoretically. Transport through the quantum wire is investigated by means of a noninteracting Anderson tunneling Hamiltonian. Analytical expressions of the transmission probability and phase are given. The transmission probability shows an energy spectrum with forbidden and allowed bands that depends on the up-down asymmetry of the system. In up-down symmetry only the gap survives, and in up-down asymmetry an allowed band is formed. We show that the allowed band arises by the indirect coupling between the up and down quantum dots. In addition, the band edges can be controlled by the degree of asymmetry of the quantum dots. We discuss the analogy between this phenomenon with the Dicke effect in optics.
description: 11 pages, 5 figures. To appear in Physica E
Neutral and charged excitations in carbon fullerenes from first-principles many-body theories
Creators: name: Tiago, Murilo L.
name: Kent, P. R. C.
name: Hood, Randolph Q.
name: Reboredo, Fernando A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate the accuracy of first-principles many-body theories at the nanoscale by comparing the low energy excitations of the carbon fullerenes C_20, C_24, C_50, C_60, C_70, and C_80 with experiment. Properties are calculated via the GW-Bethe-Salpeter Equation (GW-BSE) and diffusion Quantum Monte Carlo (QMC) methods. We critically compare these theories and assess their accuracy against available photoabsorption and photoelectron spectroscopy data. The first ionization potentials are consistently well reproduced and are similar for all the fullerenes and methods studied. The electron affinities and first triplet excitation energies show substantial method and geometry dependence. These results establish the validity of many-body theories as viable alternative to density-functional theory in describing electronic properties of confined carbon nanostructures. We find a correlation between energy gap and stability of fullerenes. We also find that the electron affinity of fullerenes is very high and size-independent, which explains their tendency to form compounds with electron-donor cations.
description: 16 pages, 1 figure, 5 tables, to be published in J. Chem. Phys
Memory of past designs: distinctive roles in individual and collective design
Creators: name: Détienne, Françoise
Publisher: name: arXiv
Year: 2006
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Empirical studies on design have emphasised the role of memory of past solutions. Design involves the use of generic knowledge as well as episodic knowledge about past designs for analogous problems : in this way, it involves the reuse of past designs. We analyse this mechanism of reuse from a socio-cognitive viewpoint. According to a purely cognitive approach, reuse involves cognitive mechanisms linked to the problem solving activity itself. Our socio-cognitive approach accounts for these phenomena as well as reuse mechanisms linked to cooperation, in particular coordination, and confrontation/integration of viewpoints.
Orbital phase in inspiralling compact binaries
Creators: name: Vasúth, Mátyás
name: Mikóczi, Balázs
name: Gergely, László Á.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We derive the rate of change of the mean motion up to the second post-Newtonian order for inspiralling compact binaries with spin, mass quadrupole and magnetic dipole moments on eccentric orbits. We give this result in terms of orbital elements. We also present the related orbital phase for circular orbits.
description: to appear in the Proceedings of the Eleventh Marcel Grossmann Meeting 2006, World Scientific, Singapore (2007)
Promoção da Saúde à pessoas com transtorno mental: revisão integrativa da literatura
Creators: name: Amaral C. Bezerra, Erika Augusta
name: da Silva Souza, Everdan
name: Amaral Alpirez, Luana
name: Heidemann, Ivonete Terezinha Schülter Buss
name: Nitschke, Rosane Gonçalves
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420504
subject: Mental health nursing

description:
A Revisão Integrativa busca identificar estudos que evidenciem estratégias ou ações implementadas em serviços de saúde para a promoção da saúde à pessoas com transtornos mentais. Com propósito de apontar essas ações, identificar possíveis lacunas na literatura e fornecer subsídios para pesquisas futuras. Além de integrar o conhecimento existente, a revisão visa fortalecer ou redefinir propostas de cuidado com foco na promoção da saúde.
Detectable Signature of Quantum Friction on a Sliding Particle in Vacuum
Creators: name: Lombardo, Fernando C.
name: Decca, Ricardo S.
name: Viotti, Ludmila
name: Villar, Paula I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Spatially separated bodies in relative motion through vacuum experience a tiny friction force known as quantum friction. This force has so far eluded experimental detection due to its small magnitude and short range. Quantitative details revealing traces of the quantum friction in the degradation of the quantum coherence of a particle are presented. Environmentally induced decoherence for a particle sliding over a dielectric sheet can be decomposed into contributions of different signatures: one solely induced by the electromagnetic vacuum in presence of the dielectric and another induced by motion. As the geometric phase has been proved to be a fruitful venue of investigation to infer features of the quantum systems, herein we propose to use the accumulated geometric phase acquired by a particle as a quantum friction sensor. Furthermore, an innovative experiment designed to track traces of quantum friction by measuring the velocity dependence of corrections to the geometric phase and coherence is proposed. The experimentally viable scheme presented can spark renewed optimism for the detection of non-contact friction, with the hope that this non-equilibrium phenomenon can be readily measured soon.
description: 10 pages, 8 figures, to appear in Advanced Quantum Technologies. arXiv admin note: text overlap with arXiv:2011.03485
INGLIZ TILINI O'RGANISHDA INNOVATSION TEXNOLOGIYALARNING O'RNI
Creators: name: Adashova Dilnura Azimovna Samarqand davlat chet tillar instituti Xorijy til va adabiyoti fakulteti 2-kurs bosqich talabasi Ilmiy rahbar : Sh. Mamayoqubova
Publisher: name: Zenodo
Year: 2023

description: Ushbu maqolada ingliz tili fanini o’qitishda innovatsion texnologiyalardan foydalanishning samarasi va o’ziga xos usullar haqida so’z boradi. Maqola davomida ingliz tili darslarida olib boriladigan turli zamonaviy innovatsion texnologiyalarning turlari, ulardan foydalanish usullariga alohida to’xtalib o’tilgan . Maqola oxirida o’quvchilarda darsga bo’lgan qiziqishni uyg’otish haqida aytib o’tilgan.

          Kalit so’zlar : Innovatsiya, texnologiya , qiziqish, faollik ,pedagokik texnologiyalar, interaktiv metodlar .
Testing for relics of past strong buckling events in edge-on galaxies: Simulation predictions and data from S$^{4}$G
Creators: name: Cuomo, V.
name: Debattista, V. P.
name: Racz, S.
name: Anderson, S. R.
name: Erwin, P.
name: Gonzalez, O. A.
name: Powell, J. W.
name: Corsini, E. M.
name: Morelli, L.
name: Norris, M. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The short-lived buckling instability is responsible for the formation of at least some box/peanut (B/P) shaped bulges, which are observed in most massive, $z=0$, barred galaxies. Nevertheless, it has also been suggested that B/P bulges form via the slow trapping of stars onto vertically extended resonant orbits. The key difference between these two scenarios is that when the bar buckles, symmetry about the mid-plane is broken for a period of time. We use a suite of simulations (with and without gas) to show that when the buckling is sufficiently strong, a residual mid-plane asymmetry persists for several Gyrs after the end of the buckling phase, and is visible in simulation images. On the other hand, images of B/P bulges formed through resonant trapping and/or weak buckling remain symmetric about the mid-plane. We develop two related diagnostics to identify and quantify mid-plane asymmetry in simulation images of galaxies that are within 3° of edge-on orientation, allowing us to test whether the presence of a B/P-shaped bulge can be explained by a past buckling event. We apply our diagnostics to two nearly edge-on galaxies with B/P bulges from the ${\it Spitzer}$ Survey of Stellar Structure in Galaxies, finding no mid-plane asymmetry, implying these galaxies formed their bulges either by resonant trapping or by buckling more than $\sim 5$ Gyr ago. We conclude that the formation of B/P bulges through strong buckling may be a rare event in the past $\sim 5$ Gyr.
description: Accepted for pubblication in MNRAS
Unveiling the nexus: the impact of social factors on sustainability in construction procurement
Creators: name: Mangvwat, Joshua S.
name: Spillane, John
name: Bradley, Jim
Publisher: name: University of Limerick
Year: 2025
Subjects: classificationCode: 40
subject: Engineering

description: Implementing social factors in construction projects contributes to the creation of social value and serves as a catalyst for promoting sustainability throughout the construction process. This paper evaluates current procurement practices within public tertiary institutions, specifically focusing on the relationship between sustainable construction and social factors in the context of Nigeria. Using survey findings, this study evaluates the interplay among these elements to determine the pivotal role social factors play in enhancing the overall well-being of both site workers and their surrounding communities. This research therefore highlights the significance of social factors on the overall well-being of site workers and community in construction projects, by clarifying the links between procurement practices, sustainable construction, and social considerations. The findings underscore the need to integrate a socially conscious approach into procurement strategies, thereby fostering positive outcomes for both the workforce and the communities engaged in construction endeavours.
title: КОНЦЕПТУАЛЬНЫЕ ОСНОВЫ МОДЕЛИ ДОПОЛНИТЕЛЬНОГО ПРОФЕССИОНАЛЬНОГО ОБРАЗОВАНИЯ УПРАВЛЕНЧЕСКИХ КОМАНД ОБЩЕОБРАЗОВАТЕЛЬНЫХ ОРГАНИЗАЦИЙ В УСЛОВИЯХ ИЗМЕНЕНИЙ (НА ПРИМЕРЕ ПСКОВСКОЙ ОБЛАСТИ)
Creators: name: Дагаева, Ирина
name: Дерзкова, Надежда
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Актуальность исследования определяется необходимостью изучения российского и зарубежного опыта подготовки и повышения квалификации руководителей общеобразовательных организаций с целью разработки концептуальной основы для трансформации региональной модели дополнительного профессионального образования в сфере общего образования. Авторы отмечают, что в условиях изменений, когда от руководителя требуется все больше разносторонних знаний и навыков, становится необходимостью непрерывно повышать квалификацию, причем не просто приобретать новые знания, а уметь их применять в своей текущей деятельности или стратегическом планировании.
Construction of explicit symplectic integrators in general relativity. III. Reissner-Nordstrom-(anti)-de Sitter black holes
Creators: name: Wang, Ying
name: Sun, Wei
name: Liu, Fuyao
name: Wu, Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Chaotic Dynamics (nlin.CD)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: F.2.2; J.2
subject: 83-08, 85-08, 70Kxx

description: We give a possible splitting method to a Hamiltonian for the description of charged particles moving around the Reissner-Nordstrom-(anti)-de Sitter black hole with an external magnetic field. This Hamiltonian can be separated into six analytical solvable pieces, whose solutions are explicit functions of proper time. In this case, second- and fourth-order explicit symplectic integrators are easily available. They exhibit excellent long-term behavior in maintaining the boundness of Hamiltonian errors regardless of ordered or chaotic orbits if appropriate step-sizes are chosen. Under some circumstances, an increase of positive cosmological constant gives rise to strengthening the extent of chaos from the global phase space; namely, chaos of charged particles occurs easily for the accelerated expansion of the universe. However, an increase of the magnitude of negative cosmological constant does not. The different contributions on chaos are because the cosmological constant acts as a repulsive force in the Reissner-Nordstrom-de Sitter black hole, but an attractive force in the Reissner-Nordstrom-anti-de Sitter black hole.
description: 15pages,26figures
Spin dynamics of $Yb Rh_2 Si_2$ observed by Electron Spin Resonance
Creators: name: Sichelschmidt, J.
name: Wykhoff, J.
name: von Nidda, H. -A. Krug
name: Ferstl, J.
name: Geibel, C.
name: Steglich, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Below the Kondo temperature $T_{\rm K}$ electron spin resonance (ESR) usually is not observable from the Kondo-ion itself because the characteristic spin fluctuation energy results in a huge width of the ESR line. The heavy fermion metal YbRh$_{2}$Si$_{2}$ seems to be an exceptional case where definite ESR spectra show characteristic properties of the Kondo-ion Yb$^{3+}$ well \textit{below} $T_{\rm K}$. We found that the spin dynamics of YbRh$_{2}$Si$_{2}$, as determined by its ESR relaxation, is spatially characterized by an anisotropy of the zero temperature residual relaxation only.
description: Presented at NanoRes 2004, Kazan; 4 pages, 3 Figures
Supplementary document for Gradual Funnel Photon Trapping Enhanced InAs/GaSb Type II Superlattice Infrared Detector - 5996658.pdf
Creators: name: Xiao, Lei
name: Peng, Zhu
name: Li, Nong
name: chang, faran
name: Shi, Haofei
name: Wei, Xingzhan
name: Xiong, Wen
name: Sun, Tai
name: Wang, Guo Wei
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: Supplemental document
The northern fur seal : biological relationships, ecological patterns and population management
Creators: name: Trites, Andrew W.
Publisher: name: University of British Columbia
Year: 2011

description: Data collected from Pribilof far seals, Callorhinus ursinus, on land (1911-89) and at sea (1958-74) are analyzed to establish biological relationships and distinguish ecological patterns that are relevant to understanding and managing northern fur seal populations. The thesis follows the development of the fur seal from conception and birth through to sexual maturity and finally to a synthesis of the earlier material in terms of population regulation, management, and reasons for the decline of the Pribilof herd. Growth curves show that male fetuses grow faster and larger than female fetuses, and that fetal size is influenced by the age, size, and reproductive history of the mother. Juvenile and adult fur seals experience pronounced seasonal increases and decreases in body length and mass. Rapid gains in mass and growth occur during a brief 1-3 month period as the population migrates through the coastal waters of northern British Columbia and Alaska on its way to the Pribilof Islands. Body mass is gradually lost during the rest of the year while fasting on land and wintering along the coasts of Washington, Oregon, and California. The timing of migration and pupping is highly synchronized from year to year and may be related to the effect of climatic conditions on pup survival during the breeding season. Predictions from a thermal budget developed for pups and the results of a seasonal decomposition of weather patterns on the Pribilof Islands show that the synchronism of births in early July corresponds to the start of three months of conditions that are optimal for growth and survival of pups. Long term fluctuations are noted in pup mass and subadult growth rates which may be related to underlying, large scale natural changes in prey abundance. Changes in the physiological condition (body growth) and vital rates (survival and reproduction) are analyzed for the period 1911-89 as the population increased and decreased. Few density dependent relationships could be demonstrated. Two hypotheses concerning the current decline of the Pribilof population are reviewed and a new, third hypothesis is proposed. The thesis also examines biases in data collection related to the effects of tagging and the handling of fur seals and outlines some directions for future research.
Automatic Expansion of Domain-Specific Affective Models for Web Intelligence Applications
Creators: name: Weichselbraun, Albert
name: Steixner, Jakob
name: Braşoveanu, Adrian M. P.
name: Scharl, Arno
name: Göbel, Max
name: Nixon, Lyndon J. B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: H.3.1; H.4.2; I.2.7

description: Sentic computing relies on well-defined affective models of different complexity - polarity to distinguish positive and negative sentiment, for example, or more nuanced models to capture expressions of human emotions. When used to measure communication success, even the most granular affective model combined with sophisticated machine learning approaches may not fully capture an organisation's strategic positioning goals. Such goals often deviate from the assumptions of standardised affective models. While certain emotions such as Joy and Trust typically represent desirable brand associations, specific communication goals formulated by marketing professionals often go beyond such standard dimensions. For instance, the brand manager of a television show may consider fear or sadness to be desired emotions for its audience. This article introduces expansion techniques for affective models, combining common and commonsense knowledge available in knowledge graphs with language models and affective reasoning, improving coverage and consistency as well as supporting domain-specific interpretations of emotions. An extensive evaluation compares the performance of different expansion techniques: (i) a quantitative evaluation based on the revisited Hourglass of Emotions model to assess performance on complex models that cover multiple affective categories, using manually compiled gold standard data, and (ii) a qualitative evaluation of a domain-specific affective model for television programme brands. The results of these evaluations demonstrate that the introduced techniques support a variety of embeddings and pre-trained models. The paper concludes with a discussion on applying this approach to other scenarios where affective model resources are scarce.
description: see also https://link.springer.com/article/10.1007/s12559-021-09839-4
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title: ÑÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ
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Creators: name: ÐÐ¾Ð²Ð¸Ðº, ÐÐ½Ð°ÑÐ¾Ð»Ð¸Ð¹
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name: ÐÐ¾Ð²Ð¸Ðº, ÐÐ°ÑÐ¸Ð»Ð¸Ð½Ð°
name: ÐÐ²ÐµÑÑÐµÐ½ÐºÐ¾, ÐÐ»ÐµÐ±
name: ÐÑÐ¼Ð°Ð¸Ð»Ð¾Ð², ÐÐ»ÐµÐºÑÐµÐ¹
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2022
Subjects: ÐÐ¾Ð¼Ð¿Ð¾Ð·Ð¸ÑÐ¸Ð¾Ð½Ð½ÑÐµ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ñ
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Noncommutative Induced Gauge Theory
Creators: name: de Goursac, Axel
name: Wallet, Jean-Christophe
name: Wulkenhaar, Raimar
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider an external gauge potential minimally coupled to a renormalisable scalar theory on 4-dimensional Moyal space and compute in position space the one-loop Yang-Mills-type effective theory generated from the integration over the scalar field. We find that the gauge invariant effective action involves, beyond the expected noncommutative version of the pure Yang-Mills action, additional terms that may be interpreted as the gauge theory counterpart of the harmonic oscillator term, which for the noncommutative $ϕ^4$-theory on Moyal space ensures renormalisability. The expression of a possible candidate for a renormalisable action for a gauge theory defined on Moyal space is conjectured and discussed.
description: 20 pages, 6 figures
The distribution and behaviour of gold in soils in the vicinity of gold mineralization, Nickel Plate mine, southern British Columbia
Creators: name: Sibbick, Steven John Norman
Publisher: name: University of British Columbia
Year: 2010

description: Sampling of soils and till are conventional methods of gold exploration in glaciated regions. However, the exact nature of the residence sites and behaviour of gold within soil and till are poorly known. A gold dispersion train extending from the Nickel Plate mine, Hedley, southwest British Columbia, was investigated in order to determine the distribution and behaviour of gold within soils developed from till. Three hundred and twelve soil, till and humus samples (representing LFH, A, B and C horizons) were collected from fifty-two soil pits and thirty-four roadcut locations within the dispersion train. Soil and till samples were sieved into four size fractions; the resultant -212 micron (-70 mesh) fraction of each sample was analysed for Au by FA-AAS. Humus samples were ground to -100 micron powder and analysed for Au by INAA. Based on the analytical results, each LFH, A, B and C horizon was subdivided into anomalous and background populations. Detailed size and density fraction analysis was carried out on soil profiles reflecting anomalous and background populations, and a mixed group of samples representing the overlap between both populations. Samples were sieved to six size fractions; three of the size fractions (-420+212, -212+106, -106+53 microns) were separated into two density fractions using methylene iodide and analysed for Au by FA-AAS. The Au content of the -53 micron fraction was analysed by FA-AAS and cyanide extraction - AAS. Results indicate that the Au content of soil profiles increase with depth while decreasing with distance from the minesite. Heavy mineral concentrates and the light mineral fraction Au abundances reveal that dilution by a factor of 3.5 occurs within the till over a distance of 800 metres. However, free gold within the heavy mineral fraction is both diluted and comminuted with distance. Recombination of size and density fractions indicate that the Au contents of each size fraction are equivalent; variation in Au abundance is not observed with a change in grain size. Seventy percent of the Au in the -53 micron fraction occurs as free gold. Chemical activity has not altered the composition of gold grains within the soil profiles. Compositional and morphological differences between gold grains are not indicative of glacial transport distance or location within the soil profile. Relative abundances of gold grains between sample locations can be used as an indicator of proximity to the minesite. The sampling medium with the best sample representivity and contrast between anomalous and background populations is the -53 micron (-270 mesh) fraction of the C horizon. Geochemical soil sampling programs in the vicinity of the Nickel Plate mine should collect a minimum mass of 370 grams of -2000 micron (-2 mm) soil fraction in order to obtain 30 grams of the -53 micron fraction.
Gamma Ray Burst Constraints on Ultraviolet Lorentz Invariance Violation
Creators: name: Kahniashvili, Tina
name: Gogoberidze, Grigol
name: Ratra, Bharat
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a unified general formalism for ultraviolet Lorentz invariance violation (LV) testing through electromagnetic wave propagation, based on both dispersion and rotation measure data. This allows for a direct comparison of the efficacy of different data to constrain LV. As an example we study the signature of LV on the rotation of the polarization plane of $γ$-rays from gamma ray bursts in a LV model. Here $γ$-ray polarization data can provide a strong constraint on LV, 13 orders of magnitude more restrictive than a potential constraint from the rotation of the cosmic microwave background polarization proposed by Gamboa, López-Sarrión, and Polychronakos (2006).
description: 5 pages, references added, accepted for publication in Phys. Lett. B
Confrontation of viewpoints in a concurrent engineering process
Creators: name: Martin, Géraldine
name: Détienne, Françoise
name: Lavigne, Elisabeth
Publisher: name: arXiv
Year: 2006
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: We present an empirical study aimed at analysing the use of viewpoints in an industrial Concurrent Engineering context. Our focus is on the viewpoints expressed in the argumentative process taking place in evaluation meetings. Our results show that arguments enabling a viewpoint or proposal to be defended are often characterized by the use of constraints. One result involved the way in which the proposals for solutions are assessed during these meetings. We have revealed the existence of specific assessment modes in these meetings as well as their combination. Then, we show that, even if some constraints are apparently identically used by the different specialists involved in meetings, various meanings and weightings are associated with these constraints by these different specialists.
Characterising the Knowledge about Primitive Variables in Java Code Comments
Creators: name: Alghamdi, Mahfouth
name: Hayashi, Shinpei
name: Kobayashi, Takashi
name: Treude, Christoph
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.2; I.2.7

description: Primitive types are fundamental components available in any programming language, which serve as the building blocks of data manipulation. Understanding the role of these types in source code is essential to write software. Little work has been conducted on how often these variables are documented in code comments and what types of knowledge the comments provide about variables of primitive types. In this paper, we present an approach for detecting primitive variables and their description in comments using lexical matching and advanced matching. We evaluate our approaches by comparing the lexical and advanced matching performance in terms of recall, precision, and F-score, against 600 manually annotated variables from a sample of GitHub projects. The performance of our advanced approach based on F-score was superior compared to lexical matching, 0.986 and 0.942, respectively. We then create a taxonomy of the types of knowledge contained in these comments about variables of primitive types. Our study showed that developers usually documented the variables' identifiers of a numeric data type with their purpose~(69.16%) and concept~(72.75%) more than the variables' identifiers of type String which were less documented with purpose~(61.14%) and concept~(55.46%). Our findings characterise the current state of the practice of documenting primitive variables and point at areas that are often not well documented, such as the meaning of boolean variables or the purpose of fields and local variables.
A Multiplicity Census of Young Stars in Chamaeleon I
Creators: name: Lafreniere, David
name: Jayawardhana, Ray
name: Brandeker, Alexis
name: Ahmic, Mirza
name: van Kerkwijk, Marten H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a multiplicity survey of 126 stars spanning ~0.1-3 solar masses in the ~2-Myr-old Chamaeleon I star-forming region, based on adaptive optics imaging with the ESO Very Large Telescope. Our observations have revealed 30 binaries and 6 triples, of which 19 and 4, respectively, are new discoveries. The overall multiplicity fraction we find for Cha I (~30%) is similar to those reported for other dispersed young associations, but significantly higher than seen in denser clusters and the field, for comparable samples. Both the frequency and the maximum separation of Cha I binaries decline with decreasing mass, while the mass ratios approach unity; conversely, tighter pairs are more likely to be equal mass. We confirm that brown dwarf companions to stars are rare, even at young ages at wide separations. Based on follow-up spectroscopy of two low-mass substellar companion candidates, we conclude that both are likely background stars. The overall multiplicity fraction in Cha I is in rough agreement with numerical simulations of cloud collapse and fragmentation, but its observed mass dependence is less steep than predicted. The paucity of higher-order multiples, in particular, provides a stringent constraint on the simulations, and seems to indicate a low level of turbulence in the prestellar cores in Cha I.
description: Accepted for publication in ApJ
Orbital stability of periodic waves for the nonlinear Schroedinger equation
Creators: name: Gallay, Thierry
name: Haragus, Mariana
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q55; 37K45; 74J30

description: The nonlinear Schroedinger equation has several families of quasi-periodic travelling waves, each of which can be parametrized up to symmetries by two real numbers: the period of the modulus of the wave profile, and the variation of its phase over a period (Floquet exponent). In the defocusing case, we show that these travelling waves are orbitally stable within the class of solutions having the same period and the same Floquet exponent. This generalizes a previous work where only small amplitude solutions were considered. A similar result is obtained in the focusing case, under a non-degeneracy condition which can be checked numerically. The proof relies on the general approach to orbital stability as developed by Grillakis, Shatah, and Strauss, and requires a detailed analysis of the Hamiltonian system satisfied by the wave profile.
description: 34 pages, 7 figures
Comparison of flood routing methods
Creators: name: Soentoro, Edy Anto
Publisher: name: University of British Columbia
Year: 2008

description: Recent developments in flood routing have resulted in several numerical models with different features. These models produce different results, and the discrepancies between computed and observed flows vary depending on the values of the channel’s friction coefficient and bed slope. The objective of this study is to find the most reliable model for a particular range of combinations of channel friction coefficient and bed slope. Results from five flood routing models -- the dynamic wave, the characteristic, the kinematic wave, Muskingum-Cunge and UBC Flow models -- were compared. The first three models are based on a hydraulic approach, but they solve the unsteady flow equations with different methods. The fourth model is based on the hydrological approach, and the last one is a hybrid model. Whith some modifications, these five different models were run using the same input parameters, and their results were compared. The comparison consists of two steps. The first involved applying the models to a set of actual Fraser River flows. The second involved comparisons of the results when the models were applied to an artificial channel with various friction coefficients and bed slopes. The latter procedure was used because of the difficulties in obtaining sufficient data from natural rivers. The computed Fraser River flows from all the above models had a good agreement to the observed outflows. However, the most accurate result was that from the dynamic wave method, followed by those from the characteristic, the kinematic wave, the UBC Flow and Muskingum-Cunge methods respectively. There are two main results from this study. First, the most reliable model is the dynamic wave method because of its accuracy and applicability, and second, the discrepancies between computed and actual flows decrease with smaller friction coefficient or steeper bed slope channel.
Fine-tuning BERT-based models for Plant Health Bulletin Classification
Creators: name: Jiang, Shufan
name: Angarita, Rafael
name: Cormier, Stephane
name: Rousseaux, Francis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: In the era of digitization, different actors in agriculture produce numerous data. Such data contains already latent historical knowledge in the domain. This knowledge enables us to precisely study natural hazards within global or local aspects, and then improve the risk prevention tasks and augment the yield, which helps to tackle the challenge of growing population and changing alimentary habits. In particular, French Plants Health Bulletins (BSV, for its name in French Bulletin de Sant{é} du V{é}g{é}tal) give information about the development stages of phytosanitary risks in agricultural production. However, they are written in natural language, thus, machines and human cannot exploit them as efficiently as it could be. Natural language processing (NLP) technologies aim to automatically process and analyze large amounts of natural language data. Since the 2010s, with the increases in computational power and parallelization, representation learning and deep learning methods became widespread in NLP. Recent advancements Bidirectional Encoder Representations from Transformers (BERT) inspire us to rethink of knowledge representation and natural language understanding in plant health management domain. The goal in this work is to propose a BERT-based approach to automatically classify the BSV to make their data easily indexable. We sampled 200 BSV to finetune the pretrained BERT language models and classify them as pest or/and disease and we show preliminary results.
Self-organization of charge under pressure in the organic conductor (TMTSF)2ReO4
Creators: name: Colin, C.
name: Auban-Senzier, P.
name: Pasquier, C. R.
name: Bechgaard, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: (TMTSF)2ReO4 presents a phase coexistence between two anion orderings defined by their wave vectors q_2=(1/2,1/2,1/2) and q_3=(0,1/2,1/2) in a wide range of pressure (8-11kbar) and temperature. From the determination of the anisotropy of the conductivity and the superconducting transitions in this regime we were able to extract the texture which results from a self-organization of the orientations of the ReO4 anions in the sample. At the lowest pressures, the metallic parts, related to the q_3 order, form droplets elongated along the a-axis embedded in the semiconducting matrix associated with the q_2 order. Above 10kbar, filaments along the a-axis extend from one end of the sample to the other nearly up to the end of the coexistence regime. A mapping of the system into an anisotropic Ising lattice is satisfactory to analyze the data. satisfactory to analyze the data.
description: 7 pages, 3 figures, EPL format
Yang-Baxter R operators and parameter permutations
Creators: name: Derkachov, S.
name: Karakhanyan, D.
name: Kirschner, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We present an uniform construction of the solution to the Yang- Baxter equation with the symmetry algebra $s\ell(2)$ and its deformations: the q-deformation and the elliptic deformation or Sklyanin algebra. The R-operator acting in the tensor product of two representations of the symmetry algebra with arbitrary spins $\ell_1$ and $\ell_2$ is built in terms of products of three basic operators $\mathcal{S}_1, \mathcal{S}_2,\mathcal{S}_3$ which are constructed explicitly. They have the simple meaning of representing elementary permutations of the symmetric group $\mathfrak{S}_4$, the permutation group of the four parameters entering the RLL-relation.
description: 22 pages LaTex, comments added, version to be published in Nucl. Phys. B
MPEC 2024-T62 : DAILY ORBIT UPDATE (2024 October 3)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Nernst effect and Critical Field in Cuprate Superconductors
Creators: name: Dias, D. N.
name: Caixeiro, E. S.
name: de Mello, E. V. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A series of recent experiments on the Nernst effect, upper critical field $H_{c2}$ and enhanced diamagnetic magnetization $M$ by Wang et al (PRB 73, 024510), were interpreted as to provide evidence for the pseudogap scenario which long-range phase coherence is destroyed by thermally-created vortices. We present here calculations in good agreement with these measurements but based on the local formation of conventional Bogoliubov-deGennes (BdG) superconducting regions in doped disordered cuprate superconductors. Our results imply in an alternate scenario which the disorder plays a fundamental role in the high critical temperature superconductors (HTSC) physics.
description: 8 pages and 4 eps figures