cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
V680 Mon -- a young mercury-manganese star in an eclipsing heartbeat system
Creators: name: Paunzen, E.
name: Huemmerich, S.
name: Fedurco, M.
name: Bernhard, K.
name: Komzik, R.
name: Vanko, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Chemically peculiar stars in eclipsing binary systems are rare objects that allow the derivation of fundamental stellar parameters and important information on the evolutionary status and the origin of the observed chemical peculiarities. Here we present an investigation of the known eclipsing binary system BD+09 1467 = V680 Mon. Using spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) and own observations, we identify the primary component of the system as a mercury-manganese (HgMn/CP3) star (spectral type kB9 hB8 HeB9 V HgMn). Furthermore, photometric time series data from the Transiting Exoplanet Survey Satellite (TESS) indicate that the system is a "heartbeat star", a rare class of eccentric binary stars with short-period orbits that exhibit a characteristic signature near the time of periastron in their light curves due to the tidal distortion of the components. Using all available photometric observations, we present an updated ephemeris and binary system parameters as derived from modelling of the system with the ELISa code, which indicates that the secondary star has an effective temperature of Teff = 8300+-200 K (spectral type of about A4). V680 Mon is only the fifth known eclipsing CP3 star and the first one in a heartbeat binary. Furthermore, our results indicate that the star is located on the zero-age main sequence and a possible member of the open cluster NGC 2264. As such, it lends itself perfectly for detailed studies and may turn out to be a keystone in the understanding of the development of CP3 star peculiarities.
description: Accepted for publication in the Monthly Notices of the Royal Astronomical Society, 10 pages, 6 figures, 4 tables
Supplementary Appendices from Long-wave equation for a confined ferrofluid interface: periodic interfacial waves as dissipative solitons
Creators: name: Yu, Zongxin
name: Christov, Ivan C.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 91504 Fluidisation and Fluid Mechanics
subject: FOS: Other engineering and technologies
subject: 10299 Applied Mathematics not elsewhere classified
subject: FOS: Mathematics
subject: 20301 Acoustics and Acoustical Devices; Waves
subject: FOS: Physical sciences

description: Supplementary appendices - text, equations and figures.
АКТУАЛЬНЫЕ ВОПРОСЫ РАЗВИТИЯ ЭКОНОМИКИ ШЕРИНГА
Creators: name: ЧЕРНОВА В.А.
name: ЧЕРНОВ А.В.
Publisher: name: Инновации и инвестиции
Year: 2020
Subjects: ЭКОНОМИКА ШЕРИНГА
ШЕРИНГ
ЭКОНОМИКА СОВМЕСТНОГО ПОТРЕБЛЕНИЯ
МОДЕЛЬ ПОТРЕБЛЕНИЯ
ПАНДЕМИЯ
ECONOMICS OF SHARING
SHARING ECONOMY
COLLABORATIVE CONSUMPTION
CONSUMPTION PATTERN
PANDEMIC

description: Экономика шеринга (экономика совместного потребления) уже десять лет привлекает внимание науки, бизнеса и социума. За этот период некоторые постулаты и модели экономики шеринга видоизменились или перестали существовать, в то же время появились новые любопытные идеи и проекты. В статье проведен анализ трансформации отдельных аспектов экономики шеринга, изучены мнения сторонников экономики совместного потребления, которые подчеркивают важную социальную направленность модели, и противников, утверждающих, что экономика шеринга ни что иное как новая «маска» капитализма. Отдельный акцент сделан на изменение экономики совместного потребления под влиянием пандемии, обозначены точки влияния и перспективы ее развития в постпандемийный период.
Bose-Einstein condensation and non-extensive statistics
Creators: name: Megias, E.
name: Timóteo, V. S.
name: Gammal, A.
name: Deppman, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the Bose-Einstein condensation in non-extensive statistics for a free gas of bosons, and extend the results to the non-relativistic case as well. We present results for the dependence of the critical temperature and the condensate fraction on the entropic index, q, and show that the condensate can exist only for a limited range of q in both relativistic and non-relativistic systems. We provide numerical results for other thermodynamics quantities like the internal energy, specific heat and number fluctuations. We discuss the implications for high energy physics and hadron physics. The results for the non-relativistic case can be of interest in cold-atom systems.
description: 18 pages, 11 figures
Random sampling of colourings of sparse random graphs with a constant number of colours
Creators: name: Efthymiou, Charilaos
name: Spirakis, Paul G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences
subject: G.3; G.2.1; G.2.2

description: In this work we present a simple and efficient algorithm which, with high probability, provides an almost uniform sample from the set of proper k-colourings on an instance of a sparse random graph G(n,d/n), where k=k(d) is a sufficiently large constant. Our algorithm is not based on the Markov Chain Monte Carlo method (M.C.M.C.). Instead, we provide a novel proof of correctness of our Algorithm that is based on interesting "spatial mixing" properties of colourings of G(n,d/n). Our result improves upon previous results (based on M.C.M.C.) that required a number of colours growing unboundedly with n.
description: 30 pages 0 figures, uses fullpage.sty
ОСОБЕННОСТИ ОСУЩЕСТВЛЕНИЯ МЕЖДУНАРОДНЫХ КОММЕРЧЕСКИХ ОПЕРАЦИЙ В СОВРЕМЕННЫХ УСЛОВИЯХ
Creators: name: КОЛГАНОВА Е.В.
Publisher: name: Инновации и инвестиции
Year: 2020
Subjects: МЕЖДУНАРОДНЫЕ КОММЕРЧЕСКИЕ ОПЕРАЦИИ
ПРЯМОЙ ЭКСПОРТ
ОПОСРЕДОВАННЫЙ ЭКСПОРТ
ЦИФРОВИЗАЦИЯ
ЭКСПОРТ ТОВАРОВ
ЭКСПОРТ УСЛУГ
INTERNATIONAL COMMERCIA
OPERATIONS
DIGITALIZATION
EXPORT OF GOODS
EXPORT OF SERVICES
INDIRECT EXPORT
DIRECT EXPORT

description: Международные коммерческие операции используются в мире с того момента, как были налажены первые международные отношения между представителями различных народов. Очевидно, что со временем в процессе развития международной торговли международные коммерческие операции претерпевали изменения как по сути, так и по форме своего осуществления. В настоящее время происходит очередной качественный переход среды международного бизнеса в новое качество, основанное в большей своей части на технологиях, позволяющих осуществлять быстрые коммуникации, а также на технологиях искусственного интеллекта. В статье представлены результаты исследования того, как изменились и продолжают трансформироваться международные коммерческие операции с товарами и услугами в современных условиях, и какие действия необходимо предпринимать компаниям, чтобы соответствовать условиям меняющейся внешней среды.
Mass-Loading and Non-Spherical Divergence in Hot Galactic Winds: Implications for X-ray Observations
Creators: name: Nguyen, Dustin D.
name: Thompson, Todd A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Cool clouds are expected to be destroyed and incorporated into hot supernova-driven galactic winds. The mass-loading of a wind by the cool medium modifies the bulk velocity, temperature, density, entropy, and abundance profiles of the hot phase relative to an un-mass-loaded outflow. We provide general equations and limits for this physics that can be used to infer the rate of cool gas entrainment from X-ray observations, accounting for non-spherical expansion. In general, mass-loading flattens the density and temperature profiles, decreases the velocity and increases the entropy if the Mach number is above a critical value. We first apply this model to a recent high-resolution galactic outflow simulation where the mass-loading can be directly inferred. We show that the temperature, entropy, and composition profiles are well-matched, providing evidence that this physics sets the bulk hot gas profiles. We then model the diffuse X-ray emission from the local starburst M82. The non-spherical (more cylindrical) outflow geometry is directly taken from the observed X-ray surface brightness profile. These models imply a total mass-loading rate that is about equal to that injected in the starburst, $\simeq 10$ M$_\odot$ yr$^{-1}$, and they predict an asymptotic hot wind velocity of $\sim 1000\,{\rm km \ s^{-1}}$ that is $\sim1.5-2$ times smaller than previous predictions. We also show how the observed entropy profile can be used to constrain the outflow velocity, making predictions for future missions like XRISM. We argue that the observed X-ray limb-brightening may be explained by mass-loading at the outflow's edges.
description: 17 pages, 12 figures, submitted to MNRAS (Accepted Oct 2021)
Alternative harvest strategies for Pacific herring
Creators: name: Hall, Donald Lincoln
Publisher: name: University of British Columbia
Year: 2010

description: A simulated Pacific herring population (Clupea harengus pallasi) is used to evaluate alternative management strategies of constant escapement versus constant harvest rate for a roe herring fishery. The biological parameters of the model are derived from data on the Strait of Georgia herring stock. The management strategies are evaluated using three criteria: average catch, catch variance, and risk. The constant escapement, strategy provides highest average catches, but at the expense of increased catch variance. The harvest rate strategy is favored for large reductions in catch variance but only a slight decrease in mean catch relative to the fixed escapement strategy. The analysis is extended to include the effects of persistent recruitment patterns. Stock-recruitment analysis suggests that recruitment deviations are autocorrelated. Correlated deviations may cause bias in regression estimates of stock-recruitment parameters (overestimation of stock productivity), and increase in variation of spawning stock biomass. The latter effect favors the constant escapement strategy, which fully uses persistent positive recruitment fluctuations. Mean catch is depressed for the harvest rate strategy, since the spawning biomass is less often located in the productive region of the stock-recruitment relationship. It is recognized that management agencies never have perfect information. Management observation error is modeled as uncertainty in spawning biomass estimates, based on data for errors in the measurements of spawn length, width and egg layers. Mean catch is reduced for both strategies. Reductions in the constant escapement strategy are more pronounced, and vary with the assumed form of the assessment error probability distribution.
E(11) and the Embedding Tensor
Creators: name: Bergshoeff, E.
name: De Baetselier, I.
name: Nutma, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show how, using different decompositions of E(11), one can calculate the representations under the duality group of the so--called "de-form" potentials. Evidence is presented that these potentials are in one-to-one correspondence to the embedding tensors that classify the gaugings of all maximal gauged supergravities. We supply the computer program underlying our calculations.
description: 16 pages, 13 tables; fixed typos, changed to JHEP style
Covariance of dark energy parameters and sound speed constraints from large HI surveys
Creators: name: Torres-Rodriguez, A.
name: Cress, C. M.
name: Moodley, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: An interesting probe of the nature of dark energy is the measure of its sound speed, $c_s$. We review the significance for constraining sound speed models of dark energy using large neutral hydrogen (HI) surveys with the Square Kilometre Array (SKA). Our analysis considers the effect on the sound speed measurement that arises from the covariance of $c_s$ with the dark energy density, $Ω_\LLambda$, and a time-varying equation of state, $w(a)=w_0+(1-a)w_a$. We find that the approximate degeneracy between dark energy parameters that arises in power spectrum observations is lifted through redshift tomography of the HI-galaxy angular power spectrum, resulting in sound speed constraints that are not severely degraded. The cross-correlation of the galaxy and the integrated Sachs-Wolfe (ISW) effect spectra contributes approximately 10 percent of the information that is needed to distinguish variations in the dark energy parameters, and most of the discriminating signal comes from the galaxy auto-correlation spectrum. We also find that the sound speed constraints are weakly sensitive to the HI bias model. These constraints do not improve substantially for a significantly deeper HI survey since most of the clustering sensitivity to sound speed variations arises from $z \lsim 1.5$. A detection of models with sound speeds close to zero, $c_s \lsim 0.01,$ is possible for dark energy models with $w\gsim -0.9$.
description: submitted to MNRAS
СВЕТЛЫЙ И ТЁМНЫЙ ГЕРОЙ В ИГРАЮЩЕМ ГОРОДЕ: ИНТЕРАКТИВНАЯ И МНОГОВАРИАТИВНАЯ МЕТОДОЛОГИЯ ПРОГНОЗИРОВАНИЯ АРХИТЕКТУРЫ БУДУЩЕГО
Creators: name: ОРЛОВ Е.А.
Publisher: name: Инновации и инвестиции
Year: 2020
Subjects: УТОПИЯ
ИГРОВОЕ ПРОСТРАНСТВО
ПРОГНОЗИРОВАНИЕ
ГОРОД БУДУЩЕГО
UTOPIA
PLAYING SPACE
FORECASTING
CITY OF THE FUTURE

description: Автор предлагает концепцию интерактивного и многовариативного прогнозирования города будущего. В статье исследуется новая тенденция в парадигме проектирования будущего - переход от создания единичной красивой идеальной версии к проектированию многочисленных параллельных вариантов будущего. Предложен основной жанр в рамках альтернативного прогноза - игровая архитектурная утопия. Проанализированы её функции, свойства и категории, выявлена основополагающая роль архитектора в процессе проектирования интерактивного архитектурного предвидения. Автор вводит концепцию «светлого» и «тёмного» архитектурного супергероя в игровой утопии. Светлый герой - это образ игрока, который управляет реальным пространством города. Тёмный герой - это образ игрока, который управляет виртуальным пространством города. На их пересечении, по мнению автора, возникает иммерсивное, интерактивное и многовариативное пространство игровой архитектуры будущего. В статье автор исследует новый подход в отношении архитектурного прогнозирования города будущего, в основе которого лежат принципы компьютерных игр. Раскрыта главная роль архитектора, который выступает в качестве героя фильма или компьютерной игры, создавая своими действиями живое игровое будущее. В финале статьи, были предложены две полярности архитектурной утопии XXI-го века: виртуальное и физическое пространство игры. На их пересечении, автор вводит новое понятие - игровой архитектурной утопии, как базовой теоремы многовариантной и интерактивной технологии прогнозирования.
Search for exotic matter from gravitational microlensing observations of stars
Creators: name: Bogdanov, M. B.
name: Cherepashchuk, A. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider small-scale spheroidal clusters of weakly interacting massive particles in our Galaxy as non-compact gravitational microlenses and predict the appearance of caustics in the plane of a lensed source. The crossing of these caustics by a lensed star can produce a large variety of light curves, including some observed in actual microlensing events that have been interpreted as manifestations of binary gravitational lenses. We consider also observable effects during the gravitational microlensing of stars of non-zero angular size with a given brightness distribution across their disks by such an exotic objects as natural wormholes and objects whose space-time environment is described with the NUT metric. We demonstrate that, under certain conditions, the microlensing light curves, chromatic and polarizational effects due to the properties of the lens and the star disk brightness distributions can differ considerably from those observed for a Schwarzschild gravitational lens, so that their analysis can facilitate the identification of such objects.
description: LaTeX, 13 pages, 7 figures, accepted for publication in Astrophysics & Space Science
СОВРЕМЕННЫЕ ТЕНДЕНЦИИ В РЕНОВАЦИИ ПОРТОВЫХ ТЕРРИТОРИЙ
Creators: name: МИРОШНИЧЕНКО Е.С.
name: ФАТКУЛЛИНА А.А.
name: ДЕМБИЧ Н.Д.
Publisher: name: Инновации и инвестиции
Year: 2020
Subjects: РЕНОВАЦИЯ
ПОРТОВЫЕ ТЕРРИТОРИИ
ТЕНДЕНЦИИ
ДЕИНДУСТРИАЛИЗАЦИЯ
ГОРОДСКАЯ СРЕДА
RENOVATION
PORT TERRITORIES
TRENDS
DEINDUSTRIALIZATION
URBAN ENVIRONMENT

description: Опыт реновации портовых территорий широко распространен в развитых странах, этот процесс имеет выраженную ориентацию на удовлетворение потребности человека в наличии комфортной и качественной окружающей среды. В статье анализируются мировые тенденции обновления портовых территорий и их влияние на устойчивое развитие городов. Процесс диверсификации бизнеса и появление общественной среды, отвечающей современным требованиям, неизбежен в стратегии устойчивого развития города. В статье рассмотрены как проектные предложения реновации портовых территорий, так и результат уже выполненных преобразований прибрежных зон в разных странах, выявлены основные тенденции этого процесса. Представлен проект реновации территории старого порта города Казани, который отвечает основным современным направлениям развития городских пространств, имеющих место в преобразовании портовых территорий. Стратегия деиндустриализации стала основным направлением для проектов трансформации портовых территорий
The anomalous Hall Effect and magnetoresistance in the layered ferromagnet Fe_{1/4}TaS_2: the inelastic regime
Creators: name: Checkelsky, J. G.
name: Lee, Minhyea
name: Morosan, E.
name: Cava, R. J.
name: Ong, N. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The large magnetic anisotropy in the layered ferromagnet Fe_{1/4}TaS_2 leads to very sharp reversals of the magnetization $\bf M$ at the coercive field. We have exploited this feature to measure the anomalous Hall effect (AHE), focussing on the AHE conductivity $σ^A_{xy}$ in the inelastic regime. At low temperature T (5-50 K), $σ^A_{xy}$ is T-independent, consistent with the Berry-phase/Karplus-Luttinger theory. Above 50 K, we extract an inelastic AHE conductivity $σ^{in}_{xy}$ that scales as the square of $Δρ$ (the T dependent part of the resistivity $ρ$). The term $σ^{in}_{xy}$ clarifies the T dependence and sign-reversal of the AHE coefficient R_s(T). We discuss the possible ubiquity of $σ^{in}_{xy}$ in ferromagnets, and ideas for interpreting its scaling with $(Δρ)^2$. Measurements of the magnetoresistance (MR) reveal a rich pattern of behavior vs. T and field tilt-angle. We show that the 2 mechanisms, the anisotropic MR effect and field-suppression of magnons, account for the intricate MR behavior, including the bow-tie features caused by the sharp reversals in $\bf M$.
description: 10 pages, 11 figures
Joint equidistribution on the product of the circle and the unit tangent bundle of the modular surface
Creators: name: Jana, Subhajit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 11F12, 37A44

description: We use spectral method to prove a joint equidistribution of primitive rational points and the same along expanding horocycle orbits in the products of the circle and the unit cotangent bundle of the modular surface. This result explicates the error bound in a recent work of Einsiedler, Luethi, and Shah \cite[Theorem $1.1$]{ELS}. The error is sharp upon the best known progress towards the Ramanujan conjecture at the finite places for the modular surface.
description: 11 pages. The paper dates from late 2018. To appear in Journal of Number Theory
ИССЛЕДОВАНИЕ ОТНОШЕНИЯ СТУДЕНТОВ И ПРЕПОДАВАТЕЛЕЙ ЛИПЕЦКОГО ГОСУДАРСТВЕННОГО ПЕДАГОГИЧЕСКОГО УНИВЕРСИТЕТА ИМЕНИ П.П. СЕМЕНОВА-ТЯН-ШАНСКОГО К РАЗВИТИЮ ТЕХНОЛОГИЙ ИСКУССТВЕННОГО ИНТЕЛЛЕКТА
Creators: name: ФРОЛОВА Е.В.
name: КАЛИТВИН В.А.
Publisher: name: Инновации и инвестиции
Year: 2020
Subjects: ИСКУССТВЕННЫЙ ИНТЕЛЛЕКТ В ОБРАЗОВАНИИ
ЭЛЕКТРОННОЕ ОБУЧЕНИЕ
ЦИФРОВИЗАЦИЯ ОБРАЗОВАТЕЛЬНОГО ПРОЦЕССА
ИНТЕРНЕТ-ОБРАЗОВАНИЕ
ЦИФРОВАЯ ТРАНСФОРМАЦИЯ
ARTIFICIAL INTELLIGENCE IN EDUCATION
E-LEARNING
DIGITALIZATION OF THE EDUCATIONAL PROCESS
INTERNET EDUCATION
DIGITAL TRANSFORMATION

description: В статье проводится анализ отношения участников образовательного процесса в вузе к развитию технологий искусственного интеллекта в условиях цифровой трансформации на примере Липецкого государственного педагогического университета имени П.П. Семенова-Тян-Шанского. Также исследуется готовность студентов и преподавателей к внедрению технологий такого рода в цифровую образовательную среду организации. Кроме того, обозначаются траектории возможного использования искусственного интеллекта в образовании студентов направлений подготовки, связанных с изучением математики и информатики. Так как искусственный интеллект проникает во все сферы деятельности человека, то образование не может стать исключением. Известно, что именно сфера образования является одной из самых инертных систем, но уже и здесь идет внедрение искусственного интеллекта, начавшееся с созданием в образовательных организациях цифровой образовательной среды. Актуальным является исследование готовности системы и ее главных участников к внедрению современных технологий с целью увеличения эффективности образовательного процесса и выстраивания индивидуальных траекторий развития не только студентов, но и преподавателей.
Ceratitis capitata: better knowledge for better risk management (FruitFlyRiskManage)
Creators: name: Horta Lopes, David Joao
Publisher: name: Zenodo
Year: 2019
Subjects: Euphresco, plant health, biology, epidemiology, monitoring, detection, modelling, Ceratitis capitata, Mediterranean fruit fly

description: Slide of the Euphresco project 2017-F-236 'Ceratitis capitata: better knowledge for better risk management (FruitFlyRiskManage)'
description: Project funded through the Euphresco network
Analysis of a power grid using the Kuramoto-like model
Creators: name: Filatrella, Giovanni
name: Nielsen, Arne Hejde
name: Pedersen, Niels Falsig
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We show that there is a link between the Kuramoto paradigm and another system of synchronized oscillators, namely an electrical power distribution grid of generators and consumers. The purpose of this work is to show both the formal analogy and some practical consequences. The mapping can be made quantitative, and under some necessary approximations a class of Kuramoto-like models, those with bimodal distribution of the frequencies, is most appropriate for the power-grid. In fact in the power-grid there are two kinds of oscillators: the 'sources' delivering power to the 'consumers'.
description: 24 pages, including 7 figures. To appear on Eur. Phys. J. B
Physics-informed Spline Learning for Nonlinear Dynamics Discovery
Creators: name: Sun, Fangzheng
name: Liu, Yang
name: Sun, Hao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Dynamical systems are typically governed by a set of linear/nonlinear differential equations. Distilling the analytical form of these equations from very limited data remains intractable in many disciplines such as physics, biology, climate science, engineering and social science. To address this fundamental challenge, we propose a novel Physics-informed Spline Learning (PiSL) framework to discover parsimonious governing equations for nonlinear dynamics, based on sparsely sampled noisy data. The key concept is to (1) leverage splines to interpolate locally the dynamics, perform analytical differentiation and build the library of candidate terms, (2) employ sparse representation of the governing equations, and (3) use the physics residual in turn to inform the spline learning. The synergy between splines and discovered underlying physics leads to the robust capacity of dealing with high-level data scarcity and noise. A hybrid sparsity-promoting alternating direction optimization strategy is developed for systematically pruning the sparse coefficients that form the structure and explicit expression of the governing equations. The efficacy and superiority of the proposed method have been demonstrated by multiple well-known nonlinear dynamical systems, in comparison with two state-of-the-art methods.
Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling
Creators: name: Lewis, Taylor N.
name: Wang, Chen
name: Daniel, John R.
name: Dhital, Madhav
name: Bardeen, Christopher J.
name: Hemmerling, Boerge
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Aluminum monochloride (AlCl) has been proposed as a promising candidate for laser cooling to ultracold temperatures, and recent spectroscopy results support this prediction. It is challenging to produce large numbers of AlCl molecules because it is a highly reactive open-shell molecule and must be generated in situ. Here we show that pulsed-laser ablation of stable, non-toxic mixtures of Al with an alkali or alkaline earth chlorides, denoted XCln, can provide a robust and reliable source of cold AlCl molecules. Both the chemical identity of XCln and the Al:XCln molar ratio are varied, and the yield of AlCl is monitored using absorption spectroscopy in a cryogenic gas. For KCl, the production of Al and K atoms was also monitored. We model the AlCl production in the limits of nonequilibrium recombination dominated by first-encounter events. The non-equilibrium model is in agreement with the data and also reproduces the observed trend with different XCln precursors. We find that AlCl production is limited by the solid-state densities of Al and Cl atoms and the recondensation of Al atoms in the ablation plume. We suggest future directions for optimizing the production of cold AlCl molecules using laser ablation.
Mild radial variations of the stellar IMF in the bulge of M31
Creators: name: La Barbera, F.
name: Vazdekis, A.
name: Ferreras, I.
name: Pasquali, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using new, homogeneous, long-slit spectroscopy in the wavelength range from ~0.35 to ~1micron, we study radial gradients of optical and near-infrared (NIR) IMF-sensitive features along the major axis of the bulge of M31, out to a galacto-centric distance of ~200'' (~800pc). Based on state-of-the-art stellar population synthesis models with varying Na abundance ratio, we fit a number of spectral indices, from different chemical species (including TiO's, Ca, and Na indices), to constrain the low-mass (<0.5M_Sun) end slope (i.e. the fraction of low-mass stars) of the stellar IMF, as a function of galacto-centric distance. Outside a radial distance of ~10'', we infer an IMF similar to a Milky-Way-like distribution, while at small galacto-centric distances, an IMF radial gradient is detected, with a mildly bottom-heavy IMF in the few inner arcsec. We are able to fit Na features (both NaD and NaI8190), without requiring extremely high Na abundance ratios. [Na/Fe] is ~0.4dex for most of the bulge, rising up to ~0.6dex in the innermost radial bins. Our results imply an overall, luminosity-weighted, IMF and mass-to-light ratio for the M31 bulge, consistent with those for a Milky-Way-like distribution, in contrast to results obtained, in general, for most massive early-type galaxies.
description: accepted for publication in MNRAS, 22 pages, 16 figures
Effects of Axion-Photon Mixing on Gamma-Ray Spectra from Magnetized Astrophysical Sources
Creators: name: Hochmuth, Kathrin A.
name: Sigl, Guenter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Astrophysical gamma-ray sources come in a variety of sizes and magnetizations. We deduce general conditions under which gamma-ray spectra from such sources would be significantly affected by axion-photon mixing. We show that, depending on strength and coherence of the magnetic field, axion couplings down to ~ 1/(10**13 GeV) can give rise to significant axion-photon conversions in the environment of accreting massive black holes. Resonances can occur between the axion mass term and the plasma frequency term as well as between the plasma frequency term and the vacuum Cotton-Mouton shift. Both resonances and non-resonant transitions could induce detectable features or even strong suppressions in finite energy intervals of gamma-ray spectra from active galactic nuclei. Such effects can occur at keV to TeV energies for couplings that are currently allowed by all experimental constraints.
description: 9 revtex pages, 3 eps figures included
Rhipidomys ybyrae Lanes & Bonvicino 2023, sp. nov.
Creators: name: Lanes, Rayque De Oliveira
name: Bonvicino, Cibele Rodrigues
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Cricetidae
Rhipidomys
Rhipidomys ybyrae

description: Rhipidomys ybyrae sp. nov.
Holotype: An adult female MN 91158, prepared as dry skin, cranium and skeleton, cell suspension and tissue, field number CRB 2768, collected by Cibele Rodrigues Bonvicino in 2005, July 14.
Paratype: An adult female MN 91157, prepared as dry skin, cranium and skeleton, cell suspension and tissue, field number CRB 2761, collected by Cibele Rodrigues Bonvicino in the same locality of the holotype, in 2005, July 14.
Type locality: Brazil, Mato Grosso state, S„o José do Xingu municipality, fazenda S„o Luís. It is in south Amazonia biome, near to “Parque Indígena do Xingu”, created in 1961 and considered the largest and one of the most famous reserves of its kind in the world.
Etymology: This name refers to the arboreal habit of this species, and came from tupi-guarani word, “ybyrá” meaning “tree”, “wood”, “trunk”.
Diagnosis: median sized Rhipidomys species (Total length ~ 275.14 mm; ONL ~ 31.98 mm); dorsal coloration is grayish brown with golden-colored hair at the tips (Table 2). Ventral region ranging from white to light creme color. Tail longer than the head and body length, with a medium-sized tuft in the tip. Dorsal part of the hind feet with a dark dorsal metatarsal patch. Skull of medium size. The interorbital region is moderately wide and converges anteriorly. The zygomatic plate is slightly rounded, inclined anteriorly may have a subtle slope or be completely straight. Shallow zygomatic notch, with nasolacrimal capsule positioned outside the notch and moderately expanded. The Incisive foramina moderately long (IFL ~ 6.36 mm) and narrow (IFB ~ 2.52 mm), in a drop shape, extending or not beyond the procingulum of M1. The mesopterygoid fossa wide and M-shaped, extending to the posterior plane of M3. The subsquamosal foramen is medium sized and rounded anteriorly; hamular process long; and postglenoid foramen small and narrow (Fig.6). Protostyle and enterostyle reduced (Fig.7).
description: Published as part of Lanes, Rayque De Oliveira & Bonvicino, Cibele Rodrigues, 2023, Reevaluation of Rhipidomys emiliae (J. A. Allen 1916) and description of a new Rhipidomys (Rodentia: Cricetidae) species from Amazonia and Cerrado, pp. 581-597 in Zootaxa 5346 (5) on pages 591-592, DOI: 10.11646/zootaxa.5346.5.5, http://zenodo.org/record/8390768
fybrrStream: A WebRTC based Efficient and Scalable P2P Live Streaming Platform
Creators: name: Halder, Debajyoti
name: Kumar, Prashant
name: Bhushan, Saksham
name: Baswade, Anand M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Multimedia (cs.MM)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: The demand for streaming media and live video conferencing is at peak and expected to grow further, thereby the need for low-cost streaming services with better quality and lower latency is essential. Therefore, in this paper, we propose a novel peer-to-peer (P2P) live streaming platform, called fybrrStream, where a logical mesh and physical tree i.e., hybrid topology-based approach is leveraged for low latency streaming. fybrrStream distributes the load on participating peers in a hierarchical manner by considering their network bandwidth, network latency, and node stability. fybrrStream costs as low as the cost of just hosting a light-weight website and the performance is comparable to the existing state-of-the-art media streaming services. We evaluated and tested the proposed fybrrStream platform with real-field experiments using 50+ users spread across India and results obtained show significant improvements in the live streaming performance over other schemes.
title: Efficient optimization algorithms for large tensor processing
title: Αποδοτικοί αλγόριθμοι βελτιστοποίησης για επεξεργασία μεγάλων τανυστών
Creators: name: Κολομβακης Χρηστος
Publisher: name: Technical University of Crete
Year: 2021

description: In this thesis, we consider the problem of tensor completion. We investigate two cases: In the first part, we consider Nonnegative Tensor Completion. We propose an improvement over an existing distributed algorithm for the solution of this problem, test it on synthetic and real datasets, and measure the execution time and speedups.
In the second part, we consider unconstrained tensor completion with smoothing constraints. We present the problem statement and we propose a distributed algorithm for its solution. We develop an algorithm which takes into account the distribution of the nonzero elements during the assignment of subtensors (and, as a result, of the corresponding subfactors) to each processor. We test our adaptive partitioning algorithm on real world datasets and measure the attained speedup.
description: Σε αυτήν την εργασία, μελετάμε το πρόβλημα του tensor completion. Μελετάμε δυο περιπτώσεις: Η πρώτη περίπτωση είναι το Nonnegative Tensor Completion. Προτείνουμε μια βελτίωση σε έναν υπάρχων αλγόριθμο, τον δοκιμάζουμε σε συνθετικά και πραγματικά δεδομένα, και μετράμε τον χρόνο εκτέλεσης και τα speedups.
Η δεύτερη περίπτωση το tensor completion με smoothness constraints. Παρουσιάζουμε το πρόβλημα και προτείνουμε έναν κατανεμημένο αλγόριθμο για τη λύση του. Χρησιμοποιούμε επίσης έναν αλγόριθμο που λαμβάνει υπόψιν την κατανομή των μη μηδενικών στοιχείων όταν αντιστοιχεί τους υποτείνουσες (άρα και τους αντίστοιχους factors) σε κάθε επεξεργαστή. Δοκιμάζουμε σε πραγματικά δεδομένα και υπολογίζουμε τον χρόνο εκτέλεσης και τα speedups του αλγορίθμου μας.
The effect of microwave and convection reheating on the vitamin B₁₂ content of roast beef produced in a cook/freeze foodservice system
Creators: name: Gellman, Catherine Elizabeth
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this study was to determine the effect of microwave and convection reheating on the vitamin B₁₂ content of roast beef produced in a cook/freeze foodservice catering system. Two concentrations of vitamin B₁₂ in a phosphate buffer, as well as vitamin B₁₂ found in roast beef, were used throughout this study to detemine the effects of domestic and commercial microwave reheating and convection reheating on vitamin B₁₂. All the vitamin analysis was done using a radioisotope dilution (RID) assay (Bio-Rad Laboratories). In order to study the effects of microwave radiation without heat on vitamin B₁₂, two solutions containing 200 pg/mL and 1500 pg/mL (nominal) were exposed to microwave radiation for time periods of up to one hour in a 625 watt and a 1300 watt microwave oven. The temperature was maintained at 0°C by resting the vials in an ice bath. Retentions ranged from 86.57 ± 3.79 % to 110.29 ± 4.94 %. A fair amount of variability was present in the data, and as a result, the differences in retention were found to be non-significant. The differences between retentions in the two oven types as well as between the two concentrations of the vitamin were also found to be non-significant. Buffer samples were exposed to temperatures of 50°C - 70°C in a 625 watt microwave, a 1300 watt microwave and a convection oven set at 180°C, to detemine the effect of heat on vitamin B₁₂. The destruction of the vitamin was not significant. Retentions ranged from 82.45 ± 3.57 % to 103.3 ± 4.6 %. Non-significant differences were found between the oven types and the two concentrations of the vitamin. Precooked, frozen and thawed roast beef samples were reheated to 70°C in the 2 microwaves and for 30 minutes in the convection oven set at 180°C in order to simulate a hospital cook/freeze catering system. Analysis of the samples indicated that all of the original B₁₂ was present after the samples were reheated. When the meat and drip portions of the samples were analyzed separately, 2.9 - 9.2 % of the vitamin was found in the drip, however, this amount was not significant. The amount of vitamin B₁₂ present in the drip was found to be related to the amount of drip released from the sample. Samples reheated in the 625 watt microwave released significantly less (p< 0.05) drip than samples reheated in either the 1300 watt microwave or the convection oven. The results of these studies suggest that reheating does not appear to have a significant effect on vitamin B₁₂ retention.
Strong hydrodynamic limit for attractive particle systems on Z
Creators: name: Bahadoran, C.
name: Guiol, H.
name: Ravishankar, K.
name: Saada, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60K35, 82C22

description: We prove almost sure Euler hydrodynamics for a large class of attractive particle systems on $\Z$ starting from an arbitrary initial profile. We generalize earlier works by Seppäläinen (1999) and Andjel et al. (2004). Our constructive approach requires new ideas since the subadditive ergodic theorem (central to previous works) is no longer effective in our setting.
description: 55 pages, LaTeX2e, corrected misprints, new title, revised abstract and introduction, references added. Mistakes in section 3 of the previous version corrected: to do so a few new arguments have been added
Demographic-Guided Attention in Recurrent Neural Networks for Modeling Neuropathophysiological Heterogeneity
Creators: name: Dvornek, Nicha C.
name: Li, Xiaoxiao
name: Zhuang, Juntang
name: Ventola, Pamela
name: Duncan, James S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: Quantitative Methods (q-bio.QM)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Biological sciences

description: Heterogeneous presentation of a neurological disorder suggests potential differences in the underlying pathophysiological changes that occur in the brain. We propose to model heterogeneous patterns of functional network differences using a demographic-guided attention (DGA) mechanism for recurrent neural network models for prediction from functional magnetic resonance imaging (fMRI) time-series data. The context computed from the DGA head is used to help focus on the appropriate functional networks based on individual demographic information. We demonstrate improved classification on 3 subsets of the ABIDE I dataset used in published studies that have previously produced state-of-the-art results, evaluating performance under a leave-one-site-out cross-validation framework for better generalizeability to new data. Finally, we provide examples of interpreting functional network differences based on individual demographic variables.
description: MLMI 2020 (MICCAI Workshop)
Gyroresonance and free-free radio emissions from multi-thermal multi-component plasma
Creators: name: Fleishman, Gregory D.
name: Kuznetsov, Alexey A.
name: Landi, Enrico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Thermal plasma of solar atmosphere includes a wide range of temperatures. This plasma is often quantified, both in observations and models, by a differential emission measure (DEM). DEM is a distribution of the thermal electron density square over temperature. In observations, the DEM is computed along a line of sight, while in the modeling -- over an elementary volume element (voxel). This description of the multi-thermal plasma is convenient and widely used in the analysis and modeling of extreme ultraviolet emission (EUV), which has an optically thin character. However, there is no corresponding treatment in the radio domain, where optical depth of emission can be large, more than one emission mechanism are involved, and plasma effects are important. Here, we extend the theory of the thermal gyroresonance and free-free radio emissions in the classical mono-temperature Maxwellian plasma to the case of a multi-temperature plasma. The free-free component is computed using the DEM and temperature-dependent ionization states of coronal ions, contributions from collisions of electrons with neutral atoms, exact Gaunt factor, and the magnetic field effect. For the gyroresonant component, another measure of the multi-temperature plasma is used which describes the distribution of the thermal electron density over temperature. We give representative examples demonstrating important changes in the emission intensity and polarization due to considered effects. The theory is implemented in available computer code.
description: 20 pages, 12 figures, ApJ in press
Supplementary scratch and indentation data from The contribution of plastic sink-in to the static friction of single asperity microscopic contacts
Creators: name: Brazil, Owen
name: Pethica, John B.
name: Pharr, George M.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Mechanics
subject: 30399 Macromolecular and Materials Chemistry not elsewhere classified
subject: FOS: Chemical sciences
subject: 100799 Nanotechnology not elsewhere classified
subject: FOS: Nanotechnology

description: A text file containing indentation load-displacement curves highlighting the elastic and plastic response of the fused silica substrate material when indented to with the 3 tips geometries studied here at normal loads relevent to the main scratch experiments. Additional scratch curves also show reproducibility of experiments.
Pervasive orientational and directional locking at geometrically heterogeneous sliding interfaces
Creators: name: Cao, Xin
name: Panizon, Emanuele
name: Vanossi, Andrea
name: Manini, Nicola
name: Tosatti, Erio
name: Bechinger, Clemens
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Understanding the drift motion and dynamical locking of crystalline clusters on patterned substrates is important for the diffusion and manipulation of nano- and micro-scale objects on surfaces. In a previous work, we studied the orientational and directional locking of colloidal two-dimensional clusters with triangular structure driven across a triangular substrate lattice. Here we show with experiments and simulations that such locking features arise for clusters with arbitrary lattice structure sliding across arbitrary regular substrates. Similar to triangular-triangular contacts, orientational and directional locking are strongly correlated via the real- and reciprocal-space moiré patterns of the contacting surfaces. Due to the different symmetries of the surfaces in contact, however the relation between the locking orientation and the locking direction becomes more complicated compared to interfaces composed of identical lattice symmetries. We provide a generalized formalism which describes the relation between the locking orientation and locking direction with arbitrary lattice symmetries.
description: Published in Physical Review E. 17 pages and 10 figures including supplementary information
Historical and mathematical aspects of iterative solutions for Monte Carlo simulations
Creators: name: Was, Z.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Over the last 25 years Monte Carlo programs were being developped in Cracow in the group guided by Prof. Stanislaw Jadach. Many of those programs became standard in their application domains. In the following let us review some aspects of such projects which were probably at the foundation of their success. We will concentrate on mathematical aspects of their design and history of their construction. It is rather difficult to cover 25 years of the research in a single talk. That is why, I have organized my presentation around Monte Carlo PHOTOS but stressing its relation to other activities and projects often realized together with Prof. Jadach. Many of omitted aspects will find their way into other perentations collected in this volume. I will concentrate on issues related to phasespace parametrization and spin amplitudes as used in our Monte Carlo programs such as MUSTRAAL, TAUOLA or KKMC and their similarities and differences with respect to solution used in PHOTOS.
description: Presented at the Cracow Epiphany Conference on LHC Physics, Cracow, Poland, 4-6 January 2008
Observational Constraints on Interstellar Grain Alignment
Creators: name: Andersson, B-G
name: Potter, S. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new multicolor photo-polarimetry of stars behind the Southern Coalsack. Analyzed together with multiband polarization data from the literature, probing the Chamaeleon I, Musca, rho Opiuchus, R CrA and Taurus clouds, we show that the wavelength of maximum polarization (lambda_max) is linearly correlated with the radiation environment of the grains. Using Far-Infrared emission data, we show that the large scatter seen in previous studies of lambda_max as a function of A_V is primarily due to line of sight effects causing some A_V measurements to not be a good tracer of the extinction (radiation field strength) seen by the grains being probed. The derived slopes in lambda_max vs. A_V, for the individual clouds, are consistent with a common value, while the zero intercepts scale with the average values of the ratios of total-to-selective extinction (R_V) for the individual clouds. Within each cloud we do not find direct correlations between lambda_max and R_V. The positive slope in consistent with recent developments in theory and indicating alignment driven by the radiation field. The present data cannot conclusively differentiate between direct radiative torques and alignment driven by H_2 formation. However, the small values of lambda_max(A_V=0), seen in several clouds, suggest a role for the latter, at least at the cloud surfaces. The scatter in the lambda_max vs. A_V relation is found to be associated with the characteristics of the embedded Young Stellar Objects (YSO) in the clouds. We propose that this is partially due to locally increased plasma damping of the grain rotation caused by X-rays from the YSOs.
description: Accepted for publication in the Astrophysical Journal