bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and stress-strain state numerical simulation of the fuel cell stack main bearing links
Authors: Крыжевич Г.Б. , Филатов А.Р. 
Published: December 2023

Объектом работы является батарея топливных элементов (БТЭ) универсального функционального модуля (УФМ) энергетической установки на топливных элементах (ЭУТЭ). Актуальность работы связана с обеспечением герметичности топливных элементов. Цель работы состоит в численном моделировании напряжённо-деформированного состояния преимущественно металлических конструкций и узлов элементов УФМ-ЭУТЭ, а также выдача рекомендаций по оптимизации распределения материала в деталях конструкции с учётом нагрузок и закреплений. Расчёты НДС конструкций БТЭ выполнялись с помощью метода конечных элементов (МКЭ), а топологическая оптимизация конструкций – с помощью метода SIMP. В результате работы определены расчётные значения усилия сжатия для узла уплотнения топливных элементов и для всей сборки БТЭ, выполнена оценка статической прочности крышки БТЭ и даны рекомендации по её оптимизации, а также определены диаметры шпилек и моменты затяжки гаек БТЭ.
The object of this work is the fuel cell battery (FCB) of a universal functional module (UFM) for a fuel cell-based power plant. The relevance of this study is associated with ensuring the sealing of fuel cells. The aim of the work is to numerically model the stress-strain state of predominantly metallic structures and components of the UFM-FCB elements, as well as to provide recommendations for optimizing material distribution in structural details, considering loads and fastenings. Finite element method (FEM) was used for the stress-strain calculations of FCB structures, and topological optimization of structures was performed using the SIMP method. As a result, of the work, the calculated values of compression force for the fuel cell sealing unit and for the entire FCB assembly were determined. An assessment of the static strength of the FCB cover was carried out, and recommendations for its optimization were provided. Additionally, the diameters of bolts and the torque values for tightening the FCB nuts were determined.
Comparison of averaged unsteady and spectral responses of beam structures
Authors: Миронов М.Ю. 
Published: December 2023

Работа посвящена управлению динамическими свойствами конструкций, нагрузка на которые задается в виде спектра силового или инерционного воздействия. Согласно положениям линейной спектральной теории, суммарный квазистатический спектральный отклик балки есть квадратичная комбинация активных собственных форм, взвешенных зависящими от вида нагрузки амплитудными коэффициентами. На основе рассмотренных в работах [1]-[2] матричных зависимостей анализа чувствительности определяются производные от спектрального отклика кусочно-призматической балки по параметрам проектирования. Используется МКЭ в варианте метода перемещений для плоской балочной модели, аналитические методы получения производных от частот, форм колебаний и нестационарных откликов, метод для комбинации модальных откликов как корня из суммы квадратов [7]. Для модели балки с большим числом КЭ выполнено сравнение распределения спектрального отклика и интегрально осредненного нестационарного отклика [3].
The work is devoted to the control of the dynamic properties of structures, the load on which is set in the form of a spectrum of force or inertia effects. According to the provisions of linear spectral theory, the total quasi-static spectral response of a beam is a quadratic combination of active eigenforms weighted by amplitude coefficients depending on the type of load. On the basis of the matrix dependencies of sensitivity analysis considered in [1]-[2], the derivatives of the spectral response of a piecewise prismatic beam are determined according to the design parameters. The FEM is used in a variant of the displacement method for a flat beam model, analytical methods for obtaining derivatives of frequencies, waveforms and non-stationary responses, a method for combining modal responses as the root of the sum of squares [7]. For a beam model with a large number of QE, a comparison of the distribution of the spectral response and the integrally averaged nonstationary response was performed [3].
Stress state of thick-walled polymer spherical shell under internal pressure
Authors: Фрумен А.И. 
Published: December 2023

В работе рассмотрено напряженно-деформированного состояния толстостенной полимерной сферической оболочки, находящейся под внутренним давлением. Отмечается, в связи с нелинейностью задачи, неприменимость «котельных» формул. Получена аппроксимация радиальных перемещений (квадратичный полином) и тангенциальных напряжений (гиперболическая зависимость) в зависимости от отношения толщины оболочки к ее радиусу. Проведены расчеты прочности и устойчивости сферического сосуда диаметром 1.6 метра, находящегося под внутренним давлением. Сравнение полученных результатов по аналитическим зависимостям (объемная задача теории упругости) и численным, выполненных по методу конечного элемента с пятью конечными элементами по толщине в расчетной модели, выявило прекрасную согласованность. Отмечается необходимость при расчете конкретных объектов обращать особое внимание на зоны с концентрацией напряжений. Показана возможность потери устойчивости толстостенной полимерной сферической оболочки, даже находящейся под внутренним давлением.
The paper considers the stress-strain state of a thick-walled polymer spherical shell under internal pressure. It is noted, due to the nonlinearity of the problem, the inapplicability of "boiler" formulas. An approximation of radial displacements (quadratic polynomial) and tangential stresses (hyperbolic dependence) depending on the ratio of the thickness of the shell to its radius is obtained. Calculations of the strength and stability of a spherical vessel with a diameter of 1.6 meters, which is under internal pressure, are carried out. Comparison of the results obtained by analytical dependencies (the volumetric problem of the theory of elasticity) and numerical, performed by the finite element method with five finite elements in thickness in the computational model, revealed excellent consistency. It is noted that it is necessary to pay special attention to zones with stress concentration when calculating specific objects. The possibility of loss of stability of a thick-walled polymer spherical shell, even under internal pressure.
Comparison Of K-Means, K-Medoids, and Fuzzy C-Means Algorithms for Clustering Drug User’s Addiction Levels
Authors: Annisa Nadaa Shabrina  , M. Afdal  , Siti Monalisa  
Published: December 2023

Narcotics, psychotropics, and addictive substances are drugs that can activate brain systems, affect dopamine levels, and cause addiction. In Indonesia, there is a law requiring drug addicts to receive treatment and care. To properly treat a drug addict, it is first necessary to determine the level of addiction. Data mining methods such as clustering can be used to assess a user's level of drug addiction. This study uses the clustering algorithms Fuzzy C-means, K-Medoids, and K-means. The performance of the three clustering algorithms will then be evaluated based on the average similarity of clusters. Data such as how many types of drugs that used, the length of time they were used, the psychiatric status, and the physical condition status, are used. Clustering was accomplished using the data mining software RStudio. The clustering algorithms were then evaluated with the Davies Bouldin Index (DBI). The K-Medoids algorithm was found to have the best average similarity value of cluster for determining drug users' addiction levels based on the results of the analysis.
Hotspots and frontiers of the relationship between gastric cancer and depression: A bibliometric study
Authors: Liu Jia-Yu , Zheng Ji-Qi , Yin Cheng-Liang , Tang Wen-Pei , Zhang Jian-Ning 
Published: December 2023

BACKGROUND
A significant relationship between gastric cancer (GC) and depression has been found in the last 20 years. However, there is no comprehensive information that helps researchers find popular and potential research directions on GC and depression.
AIM
To determine the research status and hotspots by bibliometric analysis of relevant publications on the relationship between GC and depression.
METHODS
We used the Web of Science Core Collection to search and collate the literature on GC and depression from 2000 to 2022 on 31 May, 2023. Then, visualization analysis was performed using VOSviewer software (version 1.6.19) and the Bibliometrix package in R software.
RESULTS
We retrieved 153 pertinent publications from 2000 to 2022. The annual publication count showed an overall upward trend. China had the most prominent publications and significant contributions to this field (n = 64, 41.83%). Before 2020, most studies focused on “the effect of GC on the development and progression of depression in patients.” The latest research trends indicate that “the effect of depression on the occurrence and development of GC and its mechanism” will receive more attention in the future.
CONCLUSION
The study of “the effect of depression on the occurrence and development of GC and its mechanism” has emerged as a novel research theme over the past two years, which may become a research hotspot in this field. This study provides new insights into the hotpots and frontiers of the relationship between GC and depression, potentially guiding researchers toward hot research topics in the future.
Surgical treatment of patients with shoulder joint stiffness and injury to the glenoid labrum
Authors: Sergiienko R.O. , Vovchenko G.Ya. , Yuriychuk L. , Satyshev M.M. , Bursuk Yu.Ye. , Olifirenko O.I. 
Published: December 2023

Background. Most of our colleagues, upon discovering injuries to the glenoid labrum or other soft tissue structures of the shoulder joint in a patient, perform surgical interventions without paying attention to changes in its capsule. Objective: to compare the treatment outcomes of patients with shoulder contracture who underwent arthroscopic capsular release with re-fixation of the glenoid labrum versus those who underwent only re-fixation of the glenoid labrum.
Materials and methods: The study included 98 patients with shoulder joint stiffness and glenoid labrum injury. The patients were divided into two groups: group 1 underwent re-fixation of the glenoid labrum and arthroscopic capsular release, while group 2 underwent re-fixation of the glenoid labrum without arthroscopic capsular release.
Results: Three months after the operation, in group 2, the mean functional outcome according to the Constant Shoulder Score scale was slightly worse than in group 1 and ranged from 14.5 ± 6.2 points, while in group 1, the mean functional outcome was 8.5 ± 6 points (p = 0.031). Six months after the operation, in group 1, the mean functional outcome according to the Constant Shoulder Score scale was 5.1 ± 5.6 points, while in group 2, it was 10.1 ± 4.1 points (p = 0.024). Conclusion: The results of treating patients with secondary shoulder stiffness who underwent arthroscopic capsular release and fixation of the glenoid labrum were better according to the Constant Shoulder Score and the VAS scale at both 3 and 6 months after the operation than the results of treating patients who underwent only fixation of the glenoid labrum without arthroscopic capsular release.
Torsion of the neck and adduction of the head of the talus in normal and congenital flexible flat foot
Authors: Liabakh A.P. , Haiko O.G. , Turchyn O.A. , Piatkovskiy V.M. 
Published: December 2023

Summary. The influence of neck torsion and adduction of the head of the talus (T) on the mechanogenesis of congenital flexible flatfoot (CFF) remains as unsufficiently studied issue.
Aim. To examine the torsion of the neck and adduction of the head of the T in normal conditions and CFF.
Material and methods. The study was performed on CT-scans of 36 feet of 20 patients: 17 feet (6 men, 3 women; age 26,9 ± 5 years) met the criteria of CFF, 19 feet (5 men, 6 women; age 31,4 ± 3,6 years) were used as con- trol. The neck torsion angle (NTA), the horizontal angle between the body and the head (body-head angle – BHA) were calculated. In the patients of the experimental group the angle of uncoverage of the head of the T (talo-navicular uncovrage angle – TNUA) was measured on antero-posterior weight-bearing X-ray. Mean comparisons and cor- relations were calculated using appropriate tests at a significance level 0,05.
Results. It was established that there was no significant difference between the averages charac- terizing the NTA in the norm [45,7 ± 1,4; CI 95 % (43; 48,4)] and in patients with CFF [47,7 ± 1; CI 95 % (45,8; 49,6)] (p = 0,25), instead BHA in the norm [14,7 ± 1,2; CI 95 % (12,3; 17,1)] was significantly different from that in patients with CFF [18,8 ± 1,3; CI 95 % (16,3; 21,3)] (p = 0,02). A relationship of medium strength (R = 0,5 at p = 0,05) was established between BHA and TNUA. Conclusion. A correlation of medium strength (R = 0,5) between BHA and TNUA may indicate the influence of the medial deviation of the head of the T on the instability of the peritalar zone.
Further Evidence for the ∼9 s Pulsation in LS 5039 from NuSTAR and ASCA
Authors: Makishima Kazuo , Uchida Nagomi , Yoneda Hiroki , Enoto Teruaki , Takahashi Tadayuki 
Published: December 2023

Abstract
The present study aims to reinforce the evidence for the ∼9 s pulsation in the gamma-ray binary LS 5039, derived from a Suzaku observation in 2007 and a NuSTAR observation in 2016. Through a reanalysis of the NuSTAR data incorporating the orbital Doppler correction, the 9.0538 s pulsation was confirmed successfully even in the 3–10 keV range, where it was undetectable previously. This was attained by perceiving an energy-dependent drift in the pulse phase below 10 keV and correcting the pulse timing of individual photons for that effect. Similarly, an archival 0.7–12 keV data set of LS 5039, taken with the ASCA Gas Imaging Spectrometer in 1999 October, was analyzed. The data showed possible periodicity at about 8.882 s, but again the energy-dependent phase drift was noticed below 10 keV. By correcting for this effect, and for the orbital Doppler delays in the LS 5039 system, the 2.8–12 keV periodicity became statistically significant at 8.891 ± 0.001 s. The periods measured with ASCA, Suzaku, and NuSTAR approximately follow an average period derivative of

P

̇

≈
3.0
×

10

−
10

s s−1. These results provide further evidence for the pulsation in this object and strengthen the scenario proposed by Yoneda et al. that the compact object in LS 5039 is a strongly magnetized neutron star.
Strong Resemblance between Surface and Deep Zonal Winds inside Jupiter Revealed by High-degree Gravity Moments
Authors: Cao Hao , Bloxham Jeremy , Park Ryan S. , Militzer Burkhard , Yadav Rakesh K. , Kulowski Laura , Stevenson David J. , Bolton Scott J. 
Published: December 2023

Abstract
Jupiter’s atmosphere interior is a coupled fluid dynamical system strongly influenced by the rapid background rotation. While the visible atmosphere features east–west zonal winds on the order of ∼100 m s−1, zonal flows in the dynamo region are significantly slower, on the order of ∼cm s−1 or less, according to the latest magnetic secular variation analysis. The vertical profile of the zonal flows and the underlying mechanism remain elusive. The latest Juno radio tracking measurements afforded the derivation of Jupiter’s gravity field to spherical harmonic degree 40. Here, we use the latest gravity solution to reconstruct Jupiter’s deep zonal winds without a priori assumptions about their latitudinal profile. The pattern of our reconstructed deep zonal winds strongly resemble that of the surface wind within ±35° latitude from the equator, in particular the northern off-equatorial jet (NOEJ) and the southern off-equatorial jet. The reconstruction features larger uncertainties in the southern hemisphere due to the north–south asymmetric nature of Juno's trajectory. The amplitude of the reconstructed deep NOEJ matches that of the surface wind when the wind is truncated at a depth ∼2500 km, and becomes twice that of the surface wind if the truncation depth is reduced to ∼1500 km. Our analysis supports the physical picture in which a prominent part of the surface zonal winds extends into Jupiter’s interior significantly deeper than the water cloud layer.
Concepções de Educação Ambiental de discentes de um programa de pós-graduação: uma análise a partir das macrotendências político-pedagógicas
Authors: Rosa Marllon Moreti de Souza , Maciel Eloisa Antunes , Andrade Mariana Aparecida Bologna Soares de 
Published: December 2023

Esta pesquisa investigou as compreensões de Educação Ambiental de um grupo de discentes de um Programa de Pós-Graduação em Educação Científica e Ambiental de uma Universidade Federal de Minas Gerais, em uma aproximação com as Macrotendências de Educação Ambiental. Os participantes responderam a um questionário virtual envolvendo quatro questões sobre as concepções de Educação Ambiental. Ao todo, obtivemos a resposta de 12 participantes. A partir de uma análise de conteúdo identificamos que os participantes possuem uma formação inicial muito heterogênea. Apesar das diferentes áreas de formação, todos os participantes destacaram a importância da inserção da Educação Ambiental em seus processos formativos, destacando que as compreensões de Educação Ambiental se iniciaram durante a formação inicial, no próprio curso de mestrado e na atuação docente de alguns dos participantes da pesquisa. Após a análise, percebemos que as concepções conservadoras ainda são hegemônicas, embora seja visível um processo em andamento de busca por elementos que superem o ecologismo, funcionalismo e naturalismo. Essas buscas ainda se pautam no paradigma individualista, o que reforça o conservadorismo quando se debate a questão ambiental, contudo, vislumbramos transformações substanciais em um futuro próximo. Para isso, consideramos importante a inserção crítica da Educação Ambiental no processo formativo, tanto na formação de professores como na educação básica.
Astrobiologia e a pesquisa em ensino de ciências no Brasil: anos luz da área 46?
Authors: Chefer Claudiane , Oliveira André Luis de , Grossi Luiz Eduardo 
Published: December 2023

Buscou-se por meio de uma pesquisa qualitativa de cunho bibliográfico, investigar o conteúdo metodológico/procedimental das produções científicas sobre educação em astrobiologia no contexto da pesquisa em ensino de ciências no Brasil. Para isso, procurou-se identificar quais abordagens, procedimentos de análise, instrumentos e técnicas de coleta de dados foram empregados nesses trabalhos e por meio desses elementos, analisar se essas produções condizem com o rigor teórico-metodológico que exige a pesquisa científica produzida na grande área de ensino de ciências. A maioria dos trabalhos analisados possui enfoque qualitativo, os instrumentos de coleta de dados são considerados os mais usuais na pesquisa em Educação para a ciência, entretanto, são observados poucos trabalhos que empregam o rigor teórico-metodológico que demanda essa grande área do conhecimento. Apesar dessa lacuna, as produções analisadas configuram-se como um referencial muito importante para incentivar e oferecer embasamento teórico e metodológico para futuras pesquisas a serem desenvolvidas sobre o tema.
O Letramento Digital para a efetividade das Tecnologias Digitais de Informação e Comunicação na formação do assistente social
Authors: Vitiello Maria Gorett Freire , Nantes Eliza Adriana Sheuer , Suguihiro Vera Lucia Tieko , Kfouri da Silva Samira Fayes , Sgorlon Claudiana Tavares da Silva 
Published: December 2023

As Tecnologias Digitais da Informação e Comunicação (TDIC) tem sido cada vez mais requisitadas para o exercício profissional nas diferentes áreas do conhecimento. Na atuação do assistente social, as TDIC auxiliam na organização e na tomada de decisões nos processos de trabalho. Em que pese sua importância no exercício laboral, a dificuldade em se apropriar dessas tecnologias ainda se constitui uma barreira para muitos profissionais. Nesse sentido, o objetivo desta pesquisa é identificar como o letramento digital vem sendo abordado no curso de Serviço Social de uma Instituição de Ensino Superior na cidade de Londrina-PR. A pesquisa se caracteriza como qualitativa-exploratória, com a aplicação de questionário semiestruturado para a coleta de dados junto aos estudantes e profissionais do Serviço Social, no período de agosto a novembro de 2020. A análise do material mostrou que, tanto em relação aos estudantes, como aos profissionais, o uso das TDIC tem comprometido a formação de alunos, diante de fragilidade e falta de domínio sobre o letramento digital de alunos e de professores. Diante disso, o estudo apontou que o Letramento Digital é condição para a apropriação do uso das TDIC para a formação de assistente social, considerado na atualidade, uma ferramenta fundamental para a efetividade de suas ações, sobretudo quando se exige desse profissional, uma atuação de caráter propositiva no fazer profissional.
(Re)pensando a formação continuada de professoras alfabetizadoras a partir das suas representações sociais de ensino de ciências
Authors: Gonçalves Emerson Nunes da Costa , Compiani Mauricio , Magalhães Júnior Carlos Alberto de Oliveira 
Published: December 2023

Pela relevância da alfabetização científica nos anos iniciais e das peculiaridades da formação inicial docente deste segmento de ensino, bem como pelas suas necessidades quanto aos conhecimentos de Ciências da Natureza, objetivou-se identificar as representações sociais de professores(as) alfabetizadores(as) sobre ensino de Ciências, buscando indicadores para a sua formação continuada, sendo sujeitos 26 professoras, pedagogas. Coletou-se os dados por evocação livre de palavras e enunciação textual, identificando-se o núcleo central e as categorias de análise dos elementos representativos. Por triangulação dos dados obtidos com a diretriz curricular seguida pelas docentes, identificou-se que o ensino de Ciências, nos três primeiros anos do Ensino Fundamental, apresentou-se tendencioso ao desenvolvimento do currículo prescrito, com ênfase a tópicos curriculares específicos, supostamente, limitadores da prática pedagógica, sugerindo-se a importância da elaboração e da oferta de propostas formativas que desmitifiquem o ensino sobre ciência, aproximando as docentes dos diálogos relevantes, mais atuais, sobre a educação científica nos anos iniciais.
Comment tenir au travail ? Pourquoi lâcher ?
Authors: Mieg Catherine 
Published: December 2023

Pourquoi peut-on tomber malade du travail ? Le rapport subjectif au travail, c’est-à-dire la manière dont les gens tiennent au travail et pourquoi, un jour, ils craquent, reste une énigme. Parce que le travail est un étayage essentiel en termes d’identité, il faut que certaines conditions soient réunies pour qu’il puisse aller du côté de l’épanouissement et du plaisir.
Quel bilan pour la justice internationale dans les Balkans ?
Authors: Dérens Jean-Arnault 
Published: December 2023

Le Tribunal international pour l’ex-Yougoslavie de La Haye devait dire le droit, individualiser les responsabilités dans les crimes commis afin de délivrer les sociétés du poids de la responsabilité collective et contribuer, de la sorte, à la réconciliation régionale. Il a fermé ses portes le 31 décembre dernier, sur un bilan souvent jugé bien décevant.
La robotique et le mythe de « l’homme augmenté »
Authors: Jarrassé Nathanaël , Damour Franck , Sarthou-Lajus Nathalie 
Published: December 2023

De façon régulière, les journaux nous montrent des hommes équipés de prothèses impressionnantes, des soldats courant avec des exosquelettes. Il semble, à entendre certains, que l’Humanité sera bientôt largement « augmentée » par ces divers dispositifs. Mais un état des lieux de la recherche en robotique montre un décalage surprenant entre l’imaginaire et la réalité.