bluuebunny/crossref_metadata_2025_split huggingface dataset:
Численное моделирование тепломассообменных процессов при многослойной температурной стратификации воздуха в помещении
Authors: Чуйкин С.В. , Зайцев О.Н. , Волков В.В. , Лобода А.В. 
Published: December 2024

Постановка задачи. Целью исследования является разработка компьютерной модели гидро- и термодинамических процессов в помещении с многослойной температурной стратификацией воздуха для построения полей скорости, температуры и влажности внутреннего воздуха при различных схемах и режимах работы системы кондиционирования. Результаты. Предложена система квазилинейных, негомогенных, парциальных дифференциальных уравнений, а также компьютерная модель тепломассообменных процессов в помещении при многослойной температурной стратификации воздуха, отражающие влияние распределения температуры во влажном воздухе по высоте с учетом его энтропии. Выводы. Разработанная компьютерная модель позволяет получить распределение скорости, температуры и влагосодержания воздуха в помещении с многослойной температурной стратификацией для различных принципов организации распределения воздуха и учитывает процессы испарения и конденсации на поверхностях с пониженными температурами. Это позволяет теоретически обосновать выбор рациональных технических решений и режимов работы систем вентиляции с учетом условия предотвращения выпадения конденсата на внутренних поверхностях строительных и ограждающих конструкций крытых катков и ледовых арен.
Statement of the problem. The purpose of the scientific article is to develop a computer model of hydro- and thermodynamic processes in a room with a multilayer temperature stratification of air for constructing fields of velocity, temperature and humidity of indoor air under various schemes and modes of operation of the air conditioning system. Results. A system of equations of quasi-linear, inhomogeneous, partial differential equations is proposed, as well as a computer model of heat and mass transfer processes in a room with multilayer temperature stratification of air, reflecting the influence of temperature distribution in humid air in height, taking into account its entropy. Conclusions. The developed computer model allows us to obtain the distribution of velocity, temperature and moisture content of air in a room with a multilayer temperature stratification for various principles of air distribution organization and takes into account the processes of evaporation and condensation on surfaces with low temperatures. This allows us to theoretically justify the choice of rational technical solutions and operating modes of microclimate systems, taking into account the conditions for preventing condensation on the internal surfaces of building and enclosing structures of indoor ice rinks and ice arenas.
Оценка эффективности сценариев развития транспортного коридора Россия — Монголия — Китай в условиях неопределенности
Authors: Пак М.В. , Воробьев В.С. , Мызникова В.Н. 
Published: December 2024

Постановка задачи. В современных условиях для России особое значение имеет смена логистических направлений на восток, в страны Азии, в том числе перспективный курс на Монголию и Китай. В Монголии ключевым транспортным коридором является Трансмонгольская железная дорога. Единый путь между Россией, Монголией и Китаем стоит на повестке дня уже долгое время. Результаты. Рассмотрены перспективные сценарии развития транспортного коридора Россия — Монголия — Китай, проведена оценка их эффективности в условиях неопределенности. Выводы. Проведенный методологический анализ инвестиционных проектов расширит прогнозную базу исследований реализации крупнейших проектов для успешного функционирования экономики страны.
Statement of the problem. In modern conditions, the change of logistics directions to the east, to Asian countries, including a promising course to Mongolia and China, is of particular importance for Russia. In Mongolia, the key transport corridor is the Trans-Mongolian Railway. A single route between Russia, Mongolia and China has been on the agenda for a long time. Results. The prospective scenarios for the development of the Russia-Mongolia-China transport corridor are considered, and their effectiveness is assessed under conditions of uncertainty. Conclusions. The conducted methodological analysis of investment projects will expand the forecast base of studies on the implementation of major projects for the successful functioning of the country's economy.
Avaliação da aprendizagem no Ensino de Ciências: um estudo sobre as práticas avaliativas de professores de escolas públicas do município de Pelotas, RS
Authors: Bozzato Carla Vargas , Uhmann Rosangela Inês Matos 
Published: December 2024

A avaliação da aprendizagem é realizada sistematicamente nas escolas para potencializar o processo de aprendizagem dos estudantes, possibilitando ao professor tomar decisões e definir os caminhos a seguir melhorando o processo de ensino. Sendo assim, esta pesquisa de abordagem qualitativa investiga a avaliação da aprendizagem a partir das impressões de um grupo de professores da Educação Básica, que atuam no Ensino de Ciências, de escolas públicas da cidade de Pelotas, RS. Foi realizada uma entrevista semiestruturada com professores das séries finais do Ensino Fundamental e do Ensino Médio. Os resultados obtidos da análise de conteúdo emergiram na forma de quatro categorias, a saber: i) concepções da avaliação da aprendizagem; ii) acompanhamento do processo de aprendizagem; iii) instrumentos para avaliar e, iv) registro das informações na avaliação. Portanto, as falas apontaram que a realização de práticas avaliativas está alinhada as orientações da rede de ensino, mas a maior influência está na cultura avaliativa presente em cada contexto escolar. O que exige a necessidade de práticas avaliativas entrelaçadas pela ação-reflexão, a pluralidade e o diálogo entre os alunos e professores e demais sujeitos envolvidos.
Squat Posture Analysis in Various Ethnic Groups in Malaysia
Authors: Teik Senn Jothy Yeoh Teik Senn , B. Arun , Barathi Mahadevi Barathi 
Published: December 2024

The squat posture is commonly used in an Asian population like Malaysia. Certain positions have been shown to lead to pathologies like osteoarthritis. This study compares the hip, knee, and ankle joint angles in the squat posture among the Chinese, Indian, and Malay ethnic groups. Participants (N = 31) were divided equally into three groups; Chinese, Indian, and Malay (n = 11). The hip, knee, and ankle joint angles were measured during the squat using 2-dimensional motion analysis equipment. Series one-way ANOVA, p < 0.05, was used for analysis. Significant differences in the hip angle between the Chinese and Indian groups (p = 0.020) were found. There was a significant difference in the frequency of squatting for religious purposes among the different ethnic groups (p=.000). There were moderate to high significant differences in the frequency of squatting for religious purposes among the Chinese and Malay groups (p=.049), and the Indian and Malay groups (p=.000). There were significant interethnic differences in the hip joint and the frequency of squatting for religious activities; however, further research is required to confirm these findings and expand this study's directions.
The Star Clusters as Links between Galaxy Evolution and Star Formation Project. I. Numerical Method
Authors: Reina-Campos Marta , Gnedin Oleg Y. , Sills Alison , Li Hui 
Published: December 2024

Abstract
Stellar clusters are critical constituents within galaxies: They are the result of highest-density star formation, and through their spatially and temporally correlated feedback, they regulate their host galaxy evolution. We present a novel numerical method to model star clusters as individual units of star formation using sink particles. In our method, star clusters grow via gas accretion and via merging with less massive clusters. We describe the implementation in the radiation hydrodynamics code GIZMO and run a large grid of marginally bound, turbulent clouds of 107
M
⊙ to explore the effect of modeling ingredients on the evolution of the clouds and the star clusters. We find both gas accretion and mergers to be critical processes to form star clusters of masses up to ∼105–106
M
⊙, while ionizing radiation is the main feedback mechanism regulating the growth of star clusters. The majority of our star clusters assemble their mass in 0.3–2.6 Myr, and the most massive ones take ∼10 Myr. By removing high-density gas by accretion, our sink-based cluster formation prescription allows the newly formed star clusters to inject their stellar feedback in less dense environments. This makes feedback more efficient at ionizing and disrupting the cloud than if we were to use a standard star formation approach, indicating that our numerical method is the missing critical step to model the interplay between star clusters and their host galaxies.
A High-resolution Simulation of Protoplanetary Disk Turbulence Driven by the Vertical Shear Instability
Authors: Shariff Karim , Umurhan Orkan M. 
Published: December 2024

Abstract
A high-resolution fourth-order Padé scheme is used to simulate locally isothermal 3D disk turbulence driven by the vertical shear instability (VSI) using 268.4 M points. In the early nonlinear period of axisymmetric VSI, angular momentum transport by vertical jets creates correlated N-shaped radial profiles of perturbation vertical and azimuthal velocity. This implies dominance of positive perturbation vertical vorticity layers and a recently discovered angular momentum staircase with respect to radius (r). These features are present in 3D in a weaker form. The 3D flow consists of vertically and azimuthally coherent turbulent shear layers containing small vortices with all three vorticity components active. Previously observed large persistent vortices in the interior of the domain driven by the Rossby wave instability are absent. We speculate that this is due to a weaker angular momentum staircase in 3D in the present simulations compared to a previous simulation. The turbulent viscosity parameter α(r) increases linearly with r. At intermediate resolution, the value of α(r) at midradius is close to that of a previous simulation. The specific kinetic energy spectrum with respect to radial wavenumber has a power-law region with exponent −1.84, close to the value −2 expected for shear layers. The spectrum with respect to azimuthal wavenumber has a −5/3 region and lacks a −5 region reported in an earlier study. Finally, it is found that axisymmetric VSI has artifacts at late times, including a very strong angular momentum staircase, which in 3D is present weakly in the disk’s upper layers.
Evolution of the Accretion Disk and Corona during the Outburst of the Neutron Star Transient MAXI J1807+132
Authors: Rout Sandeep K. , Muñoz-Darias Teo , Homan Jeroen , Armas Padilla Montserrat , Russell David M. , Alabarta Kevin , Saikia Payaswini 
Published: December 2024

Abstract
Low-mass X-ray binaries with a neutron star as the primary object show a complex array of phenomenology during outbursts. The observed variability in X-ray emission primarily arises from changes in the innermost regions of the accretion disk, neutron star surface, and corona. In this work, we present the results of a comprehensive X-ray spectral and timing analysis of the neutron star transient MAXI J1807+132 during its 2023 outburst using data from the NICER observatory. The outburst is marked by a very rapid rise in the count rate by about a factor of 20 in a day. The source undergoes full state transitions and displays the hysteresis effect in the hardness and rms intensity diagrams. Spectral analysis with a three-component model is consistent with disk truncation during the hard states and reaching the last stable orbit during the intermediate and soft states. We discuss the different values of the last stable radius in the context of the possible distance of the source and magnetic field strength. The characteristic frequencies throughout the hard and intermediate states are found to be strongly correlated with the inner radius of the disk. Together with the spectral and fast variability properties, we attempt to trace the evolution of the size of the corona along the outburst. Following the main outburst, the source undergoes a high-amplitude reflare, wherein it shows a complex behavior with relatively high variability (10%), but low hardness.
Detection of a Highly Ionized Outflow in the Quasiperiodically Erupting Source GSN 069
Authors: Kosec P. , Kara E. , Brenneman L. , Chakraborty J. , Giustini M. , Miniutti G. , Pinto C. , Rogantini D. , Arcodia R. , Middleton M. , Sacchi A. 
Published: December 2024

Abstract
Quasiperiodic eruptions (QPEs) are high-amplitude, soft X-ray bursts recurring every few hours, associated with supermassive black holes. Many interpretations for QPEs were proposed since their recent discovery in 2019, including extreme mass ratio inspirals and accretion disk instabilities. But, as of today, their nature still remains debated. We perform the first high-resolution X-ray spectral study of a QPE source using the Reflection Grating Spectrometers' gratings on board XMM-Newton, leveraging nearly 2 Ms of exposure on GSN 069, the first discovered source of this class. We resolve several absorption and emission lines including a strong line pair near the N vii rest-frame energy, resembling the P-Cygni profile. We apply photoionization spectral models and identify the absorption lines as an outflow blueshifted by 1700−2900 km s−1, with a column density of about 1022 cm−2 and an ionization parameter

log
(
ξ

/erg cm s−1) of 3.9−4.6. The emission lines are instead redshifted by up to 2900 km s−1, and likely originate from the same outflow that imprints the absorption features, and covers the full 4π sky from the point of view of GSN 069. The column density and ionization are comparable to the outflows detected in some tidal disruption events, but this outflow is significantly faster and has a strong emission component. The outflow is more highly ionized when the system is in the phase during which QPEs are present, and from the limits, we derive on its location, we conclude that the outflow is connected to the recent complex, transient activity of GSN 069, which began around 2010.
Irradiated Atmospheres. I. Heating by Vertical-mixing-induced Energy Transport
Authors: Zhong Wei , Zhang Zhen-Tai , Zhong Hui-Sheng , Ma Bo , Tan Xianyu , Yu Cong 
Published: December 2024

Abstract
Observations have revealed unique temperature profiles in hot Jupiter atmospheres. We propose that the energy transport by vertical mixing could lead to such thermal features. In our new scenario, strong absorbers, TiO, and VO are not necessary. Vertical mixing could be naturally excited by atmospheric circulation or internal gravity wave breaking. We perform radiative transfer calculations by taking into account the vertical-mixing-driven energy transport. The radiative equilibrium is replaced by the radiative-mixing equilibrium. We investigate how the mixing strength, K
zz, affects the atmospheric temperature–pressure profile. Strong mixing can heat the lower atmosphere and cool the upper atmosphere. This effect has important effects on the atmosphere's thermal features that would form without mixing. In certain circumstances, it can induce temperature inversions in scenarios where the temperature monotonically increases with increasing pressure under conditions of lower thermal band opacity. Temperature inversions show up as K
zz increases with altitude due to shear interaction with the convection layer. The atmospheric thermal structure of HD 209458b can be well fitted with K
zz ∝ (P/1 bar)−1/2 cm2 s−1. Our findings suggest vertical mixing promotes temperature inversions and lowers K
zz estimates compared to prior studies. Incorporating chemical species into vertical mixing will significantly affect the thermal profile due to their temperature sensitivity.
The Impact of Void-finding Algorithms on Galaxy Classification
Authors: Zaidouni Fatima , Veyrat Dahlia , Douglass Kelly A. , BenZvi Segev 
Published: December 2024

Abstract
We explore how the definition of a void influences the conclusions drawn about the impact of the void environment on galactic properties using two void-finding algorithms in the Void Analysis Software Toolkit: Voronoi Voids (V

2
), a Python implementation of ZOnes Bordering On Voidness (ZOBOV); and VoidFinder, an algorithm that grows and merges spherical void regions. Using the Sloan Digital Sky Survey Data Release 7, we find that galaxies found in VoidFinder voids tend to be bluer and fainter and to have higher (specific) star formation rates than galaxies in denser regions. Conversely, galaxies found in V

2
voids show less significant differences when compared to galaxies in denser regions, less consistent with the large-scale environmental effects on galaxy properties expected from both simulations and previous observations. These results align with previous simulation results that show V

2
-identified voids “leak” into the dense walls between voids because their boundaries extend up to the density maxima in the walls. As a result, when using ZOBOV-based void-finders, galaxies likely to be part of wall regions are instead classified as void galaxies, a misclassification that can be critical to our understanding of galaxy evolution.
A Flat-bottomed Buried Crater and Paleo-layered Structures Revealed at the Von Kármán Crater Using Lunar Penetrating Radar
Authors: Zhang Ling , Meng Xindong , Qian Yuqi , Xu Yi , Zhang Xiaoping , Liu Zhipeng , Lai Jialong , Gao Rui 
Published: December 2024

Abstract
Impact cratering is the most common geological process occurring on terrestrial planets. The morphologies of impact craters reflect not only the impact conditions but the target properties as well. They have been widely used as subsurface probes into regolith thickness and mechanical properties. A population of paleo-buried impact craters has been discovered by recent geophysical investigations of the Moon; however, their morphologies have never been constrained. The lunar penetrating radar onboard the Chang’e-4 rover has offered an unprecedented opportunity to study the morphology of those paleo-buried craters and reveal obscured depositing history. In this study, we have identified a flat-bottomed paleocrater (450 m in diameter; 11.5 m in depth) on an extraterrestrial world and reconstructed its morphology. This discovery reinforces how impacts would modify layered structures, providing additional evidence regarding subsurface interfaces between the paleoregolith layers and the final-stage lava layers, shedding light on similar processes on all planets.
An Exploration of Molecular Lines for Abundance Analysis in M-dwarf IR Spectra
Authors: Flores Isabella , Maas Zachary G. , Hinkel Natalie R. 
Published: December 2024

Abstract
We identified detectable molecular absorption lines and estimated the abundances of carbon (C), aluminum (Al), chlorine (Cl) and chromium (Cr) in an M dwarf star with  T
eff ~ 3100 K. We chose a well-studied M-dwarf, HD 125455B, since this star is in a binary pair with K-type star, HD 125455. Abundance analysis was conducted using a high-resolution H-band spectrum from IGRINS. We identified CO lines to test the methodology and identified detectable AlO, HCl, and CrH lines in the IR H-band. We determined upper limits for stellar abundances for [C/H], [Al/H], [Cl/H], and [Cr/H] in HD 125455B and we provided a comparison to known abundances for HD 125455.
Little Time for Oscillation: Fast Disruption of the Radcliffe Wave by Galactic Motions
Authors: Li Guang-Xing , Zhou Ji-Xuan , Chen Bingqiu 
Published: December 2024

Abstract
The Radcliffe wave is a 2.7 kpc long, 100 pc wide-like structure in the Galactic disk with a wave-like velocity structure. A referent Nature paper treated the Wave as a solid body in the disk plane, modeled its oscillation along the vertical direction, and derived the local Galactic mass distribution from the oscillation pattern. In reality, Galactic shear can stretch gas through differential rotation, whereas gas clouds experience epicyclic motions. We simulate the 3D evolution of the local interstellar gas and find shear and encyclic motion stretches the Radcliffe wave to almost twice its current length at the timescale of 45 Myr, within which only half a cycle of the proposed vertical oscillation occurs. The simulation also reveals the formation of new filaments and filament-filament mergers. Treating the Radcliffe wave as a solid body in the Galactic disk and an oscillating structure in the vertical direction is thus an oversimplification. Our data-driven simulation reveals the 3D evolution of the local interstellar gas with several processes at play, strengthening the role of the Solar Neighborhood as a unique test ground for theories of interstellar gas evolution.
Ejected Particles after Impact Splash on Mars: Electrification
Authors: Becker T. , Onyeagusi F. C. , Teiser J. , Jardiel T. , Peiteado M. , Muñoz O. , Martikainen J. , Gomez Martin J. C. , Merrison J. , Wurm G. 
Published: December 2024

Abstract
Within the RoadMap project, we investigated the microphysical aspects of particle collisions during saltation on the Martian surface in laboratory experiments. In earlier works, we followed the size distribution of ejected particles, their aerodynamic properties, and aggregation status upon ejection. We now focus on the electrification and charge distribution of ejected particles. We analyzed rebound and ejection trajectories of grains in a vacuum setup with a strong electric field of 100 kV m−1 and deduced particle charges from their acceleration. The ejected particles have sizes of about 10–100 μm. They carry charges up to 105 e or charge densities up to >107 e mm−2.
Le travail de discussion dans les centres communautaires de santé
Authors: Readi Ricardo 
Published: December 2024

L’auteur de cet article cherche à souligner la pertinence du travail psychanalytique dans le domaine de la santé mentale communautaire. Les orientations théoriques qui sous-tendent ce point de vue sont basées sur le concept des systèmes sociaux de défense introduit par Elliott Jaques et développé plus avant par Isabel Menzies ; quant à la méthode d’intervention utilisée, elle s’apparente au travail de discussion, un mode d’approche original et à l’application réaliste conçu et étayé par la Tavistock Clinic. Grâce à ces apports, nous pouvons considérer comment le dysfonctionnement de l’institution est lié à la façon dont son travail implique une activité défensive entretenue inconsciemment par les participants, travailleurs et patients. Après une description de cette méthode et la pensée qui la soutient, l’auteur expose en détail son application dans le contexte d’un Centre communautaire de santé mentale à Santiago, au Chili. Il illustre son propos par plusieurs vignettes cliniques en même temps qu’il évoque quelques réflexions sur la valeur de ce type d’intervention pour la communauté.