bluuebunny/crossref_metadata_2025_split huggingface dataset:
INVESTIGATION OF NEW POLYMORPHIC VARIETIES OF BORON NITRIDE WITH DIAMOND-LIKE STRUCTURES
Authors: Ряшенцев Дмитрий Сергеевич , Беленков Евгений Анатольевич 
Published: December 2020

В работе проведено теоретическое исследование новых полиморфных разновидностей нитрида бора, имеющих алмазоподобные структуры. В результате расчетов методом теории функционала плотности в градиентном приближении была установлена возможность устойчивого существования четырех новых структурных разновидностей нитрида бора: BN - LA4, BN - LA5, BN - LA6 и BN - LA7 . Энергия сублимации новых BN фаз варьируется в диапазоне от 16,85 до 17,84 эВ/(BN), ширина запрещенной зоны - от 4,34 до 6,07 эВ. Объемная плотность BN полиморфов изменяется от 3,020 до 3,452 г/см.
The article presents a theoretical study of new polymorphic varieties of boron nitride with diamond-like structures. As a result of calculations by the density functional theory method in the gradient approximation, the possibility of stable existence of four new structural varieties of boron nitride: BN - LA4, BN - LA5 , BN - LA6, and BN - LA7 was established. The sublimation energy of new BN phases varies in the range from 16,85 to 17,84 eV/(BN), the band gap is from 4,34 to 6,07 eV. The bulk density of BN polymorphs varies from 3,020 to 3,452 g/cm.
SOME STATISTICAL DISTRIBUTIONS, WHICH DESCRIBE THE NANOTOPOGRAPHY OF TECHNICAL SURFACES
Authors: Измайлов Владимир Васильевич , Новоселова Марина Вячеславовна 
Published: December 2020

Исследована нанотопография технических поверхностей деталей из высоколегированной термообработанной стали и электротехнического серебра после финишной механической обработки. Экспериментально определены функции плотности вероятности параметров нанотопографии - высот выступов и радиусов кривизны их вершин, которые необходимы для теоретического описания процессов контактного взаимодействия технических поверхностей (на примере поверхностей серебра и стали). Установлено, что распределение указанных параметров наношероховатости сильно асимметрично и далеко от нормального. Доказано, что для исследованных поверхностей плотность вероятности указанных параметров наношероховатости адекватно описывается бета-распределением. Достоверность данного заключения подтверждается с помощью критериев согласия Пирсона χ и Романовского.
The nanotopography of engineering surfaces of machine parts made of high alloy heat-treated steel and electric silver after finishing mechanical treatment was studied. The probability density functions of the nanotopography parameters - the heights of peaks and the radii of curvature of their vertices - were experimentally determined. These parameters are necessary for theoretical description of processes of the contact interaction of engineering surfaces (exemplifying on surfaces of silver and steel). It is established that the distributions of the above mentioned nanoroughness parameters are essentially asymmetrical and are far from normal ones. It has been proved that for the studied surfaces the probability densities of the above mentioned nanoroughness parameters are adequately described by the beta-distribution. The validity of this conclusion is confirmed by the fitting criteria such as χ (K. Pearson’s criterion) and Romanovsky’s criterion.
THE MICROSTRUCTURE OF POLYMER FUNCTIONAL COATINGS WITH SILVER NANOPARTICLES FOR SOLAR CELLS
Authors: Кравцов Александр Александрович , Девицкий Олег Васильевич , Кулешов Дмитрий Сергеевич , Пащенко Александр Сергеевич 
Published: December 2020

В рамках работы на кремниевых солнечных элементах были получены полимерные функциональные покрытия с наночастицами серебра. Размер наночастиц, использовавшихся для создания покрытий составил ~ 100 нм. Впервые была исследована микроструктура полученных покрытий методом сканирующей электронной микроскопии. Было показано, что наночастицы имеют достаточно высокую и равномерную плотность распределения в покрытии. В покрытиях, полученных с помощью метода осушения присутствуют единичные дефекты в виде отсутствия пленки. Данные дефекты предположительно обусловлены перепадами микрорельефа на поверхности солнечных элементов и могут быть устранены путем повторного нанесения пленки. Проведенные экспериментальные исследования квантового выхода фотопреобразователей показали, что функциональные покрытия на основе полимеров с наночастицами серебра позволяют существенно улучшить характеристики кремниевых солнечных элементов.
Within the framework of this study, functional polymer coatings with silver nanoparticles were obtained on the surface of silicon solar cells. The size of the nanoparticles used to create the coatings was ~ 100 nm. For the first time, the microstructure of the obtained coatings was investigated by scanning electron microscopy. It was shown that nanoparticles have a sufficiently high and uniform distribution density in the coating. In the coatings obtained using the drying method, that there are single defects in the form of the absence of a film. These defects are presumably due to differences in microrelief on the surface of solar cells and can be eliminated by reapplying the film. Experimental studies of the quantum yield of photoconverters have shown that functional coatings based on polymers with silver nanoparticles can significantly improve the characteristics of silicon solar cells.
INVESTIGATION OF OPTICAL PROPERTIES OF WATER-SOLUBLE ELECTROLYTES BASED ON Α-AMINO ACIDS
Authors: Малкандуев Юсуф Ахматович , Кокоева Анета Ахмедовна 
Published: December 2020

Из литературы известно, что L - аминокислоты, кроме глицина, являются оптически активными веществами и обладают способностью вращать плоскость поляризации проходящего через него поляризованного луча света в левую сторону. В работе приводиться синтез и радикальная полимеризация водорастворимых полиэлектролитов на основе L - валина и L - лейцина. В работе описывается способ получения новых нанокомпозиционных материалов на основе синтезированных полимеров и модифицированного монтмориллонита. Исследованыоптически активных свойства и определены величина удельного вращения плоскости поляризации для алкилированной аминокислоты - N, N - диаллилвалина и N, N - диаллиллейцина.
It is known from literature that L - amino acids, in addition to glycine, are optically active substances and have the ability to rotate the polarization plane of a polarized light beam passing through it to the left side. The paper presents the synthesis and radical polymerization of water-soluble polyelectrolytes based on L - valine and L - leucine. This paper describes a method for obtaining new nanocompositional materials based on synthesized polymers and modified montmorillonite. The optically active properties were investigated and the value of the specific rotation of the polarization plane for the alkylated amino acid - N, N - diallylvaline and N, N - diallylleucine was determined.
NANOSTRUCTURES IN THE THIN LAYER OF COAL SUBSTANCE
Authors: Юров Виктор Михайлович , Маханов Канат Мэтович , Портнов Василий Сергеевич 
Published: December 2020

В представленной работе рассмотрен поверхностный слой угольного вещества, структура и характеристики которого отличны от структуры объема. Этот слой имеет два уровня: d(I) равный 151,5 нм и d(II)≈10 ⋅ d равный 1515 нм для антрацита. Для чистых металлов d(I) равно 1 - 6 нм, что на 2 порядка меньше поверхностного слоя угольного вещества. Толщина этого слоя имеет порядок толщин высших фуллеренов С, равного 135 нм. Все эти особенности угольного вещества, имеющего углеродную основу и представляющего собой полимер с надмолекулярной структурой, приводят к тому, что именно поверхностный слой определяет физические процессы в нем, связанные с протеканием газов и жидкости, а также с явлениями взрывоопасности.
In the present work, the surface layer of a coal substance is considered, the structure and characteristics of which are different from the bulk structure. This layer has two levels: d (I) equal to 151,5 nm and d(II) ≈ 10 ⋅ d equal to 1515 nm for anthracite. For pure metals d(I) is equal 1 - 6 nm, that is 2 orders of magnitude lesser than the surface layer of the coal substance. The thickness of this layer is of the order of 135 nm for the higher C fullerenes. All these features of a coal substance, which has a carbon base and is a polymer with a supramolecular structure, lead to the fact that it is the surface layer that determines the physical processes in it associated with the flow of gases and liquids, as well as with the phenomena of the explosion hazard.
SYNTHESIS OF MAGNESIUM PHOSPHATES IN A POLYMERIC MATRIX
Authors: Мусская Ольга Николаевна , Крутько Валентина Константиновна , Кулак Анатолий Иосифович 
Published: December 2020

Изучена зависимость фазового состава наноразмерных фосфатов магния (MgNHPO·6HO, Mg(HPO), MgHPO·3HO, Mg(PO)•22HO) с размером кристаллитов 13-54 нм от условий осаждения из водных растворов в присутствии поливинилового спирта и его смеси с поливинилпирролидоном. В полимерной матрице дополнительно образуется примесная фаза MgOHCl. Наличие средних и двузамещенных фосфатов магния в пленках поливинилового спирта и поливинилового спирта/поливинилпирролида ингибируют их термическую деструкцию.
The dependence of the phase composition of nanoscale magnesium phosphates (MgNHPO·6HO, Mg(HPO), MgHPO·3HO, Mg(PO)•22HO) with 13-54 nm crystallite size on the conditions of precipitation from aqueous solutions in the presence of the polyvinyl alcohol and its mixture with polyvinylpyrrolidone was studied. In the polymer matrix an additional impurity phase MgOHCl is formed. The presence of medium and disubstituted magnesium phosphates in polymer films of polyvinyl alcohol and polyvinyl alcohol/polyvinylpyrrolidone inhibit their thermal destruction.
THE IMPLEMENTATION OF INTERACTIVE MULTIMEDIA IN IMPROVING MATHEMATICS LEARNING OUTCOMES
Authors: Nurmawati Nurmawati , Masduki Lusi Rachmiazasi , Prayitno Edy , Dartani Maria Yustina Rensi 
Published: December 2020

Mathematics is a difficult subject and even becomes a phobia, more due to teaching conventionally in where the teaching and learning process emphasizes more on teacher, working on problems, memorization and speed of arithmetic, so students lack understanding of what they are learning, which in this case does not have an understanding of the concepts taught. Students tends to be lazy and have low motivation to study mathematics both classically and to study independently at home. The growth of information and communication technology in society is reflected in policies to encourage the use of ICT in education and the development of educational multimedia. Multimedia includes using text, images, animation, video and audio to prepare courses for students in various levels of education. Attendance of multimedia technology can help students learn to be more interesting and help students understanding in learning. The purpose of the study was to know whether there was any significant difference in the result between the students of class IV Manyaran 01 Elementary School towards increasing their understanding in math who taught by using the interactive multimedia and who taught by conventionally. The result of the study showed that the interactive multimedia gave an effect to the improvement of the students’ understanding in mathematics.
Bahts Naqd 'An al-Jumlah 'Ind al-Nuhat wa Atsaruh Fi al-Ta'lim
Authors: Aisyah Devy 
Published: December 2020

This study aims to critic the concepts of classical and modern Arabic linguists about sentences which they term differently including: number, kalam, tarkib (sentence, phrase). Their differences are inseparable from polemics, especially in providing boundaries and terms used, both in the classical and modern eras. For example the polemic on the use of terminology and the number and meaning of both, whether synonymous or not, which then affects the elements that build it. This study uses a literature study (library research) with content analysis and hermeneutic approaches. This research found that basically the differences in Arabic experts both in the classical and modern eras were not substantive, but rather as editorial debates, technical terminology, and partial.The old grammarian tended to be complicated in providing a definition of sentence compared to contemporary Islamic scholar, it was easier to explain about this sentence.
Research on the influence of workpiece orientation during processing in disc centrifugal machine on the geometrical structure of its surface and processing efficiency
Authors: Plichta Jarosław , Juniewicz Mateusz 
Published: December 2020

The article describes the result of experiments witch were intended to compare the results of different workpieces orientation in disc centrifugal machine. During experimental investigations, particular attention was paid to the optimal orientation the workpiece in working charge. The results of the research presented in this article confirm the benefit of horizontal orientation of the workpiece to the motion of the media in the working charge.
A gênese de Chavantes - SP até a primeira metade do século XX: relação rural-urbano
Authors: Dias Franciele Miranda Ferreira 
Published: December 2020

O objetivo do trabalho é apresentar a dinâmica rural-urbana de Chavantes até a primeira metade do século XX, momento de ruptura, em decorrência de mudanças nos processos produtivos e da acentuação e da intensificação da urbanização, trazendo novos papeis à cidade perante o rural. Considera-se nesse trabalho os elementos que influenciaram a gênese do município de Chavantes: a expansão dos trilhos da E.F. Sorocabana e do cafeeiros em direção ao Centro-Oeste Paulista, no início do século XX. Para a realização do trabalho, quanto à compreensão da gênese da cidade, consultou-se a bibliografia relativa à história de Chavantes e de Santa Cruz do Rio Pardo (do qual Chavantes foi distrito) bem como dados censitários, com o intuito principalmente, de analisar a dinâmica-rural urbana, durante o período citado. Foi realizado um levantamento de campo em junho de 2018, com o objetivo de coletar informações acerca dos aspectos históricos e da dinâmica rural-urbana, não esclarecidos pela bibliografia consultada. Compreendeu-se que, a origem de Chavantes relaciona-se diretamente à expansão cafeeira e a inserção da ferrovia, bem como o desenvolvimento do município, no período analisado, está atrelado aos dois elementos citados, importantes na dinâmica rural-urbana.
Entrevista - Um diálogo sobre Ciência com o Professor Dr. Gilberto Fisch
Authors: Silva Charlei Aparecido da , Sanches Fabio De Oliveira 
Published: December 2020

Entrevista realizada com Dr. Gilberto Fisch. Meteorologista, docente da UNITAU, pesquisador do Instituto Nacional de Pesquisas Espaciais (INPE) e bolsista de produtividade em pesquisa do CNPq-Nível 1B.
Mobile Health Applications for Osteoporosis Support Available on the Market: A Systematic Review
Authors: Safdari Reza , Alikhani Majid , Tahmasbi Foziyeh , Javanmard Zohreh , Heydarian Saeedeh 
Published: December 2020

Introduction: The use of mobile applications (apps) become widespread and Provide many benefits especially in healthcare. According to the World Health Organization, osteoporosis is one of the most common diseases of elderly in the world. Like other chronic conditions, disease self-management can prove fruitful. Using a mobile application for Osteoporosis can improve patient care and self-management by encouraging patients to take a more active role in their health.Material and Methods: This study presents a systematic review of mHealth applications, available on Google Play Store, Bazaar market (as a local market) and also Apple App Store, for both the English and Persian speakers. The assessment criteria, including content, visual aids, reminders, health warnings, social and design of selected apps, were tested during July 2019.Results: Reviewing the 19 included applications showed that the most and least focus of apps content was on exercise with 84% repetition and the osteoporosis fracture that no program addressed this issue separately. Findings on reminders, health warnings, and visual aids were not very encouraging (available in 11% apps). Reminders were more common in English-speaking apps than Persian-speaking ones, and Visual aids, one of the benefits of mobile apps over paper logbooks, were provided only in2 apps. The opportunity to share data in social networks was available in 26% of apps, and in the design section, most of the apps have no significant flaws, but 74% of cases did not provide any clear instructions required for the elderly.Conclusion:The review shows that there are rather few products on offer and the ones that are available display low quality, poor performance, and evidence-based information is also insufficiently used. Further efforts are required to collect data that will support the design of validated evidence-based educational functions for mHealth apps.
Алгоритм планування завантаження повітряного судна за критерієм пріоритетності
Authors: Сагун Є.C. , Сагун А.О. 
Published: December 2020

Стаття присвячена дослідженню особливостей алгоритму оптимізації планування завантаження та необхідності його використання у реальному часі. Оскільки більшість вивчених моделей оптимізації завантаження не враховують фактори часу завантаження та деякі обмеження з центрування та завантаження, то представлений алгоритм завантаження надасть можливість більш ефективно організувати планування завантаження повітряного судна, запобігаючи появі невикористаного простору у вантажному відсіку, в умовах мультилагового маршруту. Представлений надалі алгоритм оптимізації передбачає розташування вантажу у вантажному відсіку ПС у заздалегідь визначений час та у порядку, визначеному конкретною документацією з пріоритетністю вивантаження у проміжних ділянках мультилагового маршруту, не перевищуючи обмеження із центрування та завантаження, а також мінімізувавши час завантаження та витрати на обслуговування у перерахунку на кожний рейс. Даний алгоритм став основою для оптимізаційної моделі планування завантаження, яка була наочно представлена у програмі комп’ютерного моделювання Blender v 2.83 Beta.
Dal passato al futuro. La trasmissione del progetto politico attraverso una genealogia femminile nella prima metà del secolo XX
Authors: Laurenzi Elena 
Published: December 2020

Il saggio indaga la trasmissione di idee e progettualità tra due generazioni di donne nella Puglia della prima metà del ‘900. Il percorso storiografico ricostruisce le vicissitudini di un progetto politico nato nell’ambito del movimento emancipazionista liberale, che si concretizza in iniziative sia istituzionali che semi-private, radicate nel locale ma di respiro internazionale. Il saggio pone questioni a carattere metodologico e storiografico quali il valore delle carte private come risorsa per cogliere la trasmissione del pensiero politico femminile o il riferimento al progetto quale momento di articolazione tra teoria e prassi. Le conclusioni suggeriscono la possibilità di rimodulare il giudizio della storiografia femminista in merito al «femminismo pratico» di inizio secolo XX.
Síndrome de Bouveret
Authors: Petracchi Enrique , Chaktoura Diego , Merchán Pablo 
Published: December 2020

Síndrome de Bouveret. Mujer de 59 años, consultó a urgencias por dolor abdominal generalizado, acompañado de nausea y vómitos de 72 horas de evolución. Al examen físico presentó un abdomen blando, distendido, sin signos de peritonismo. La tomografía computarizada evidenció una obstrucción gástrica secundaria al impacto de un cálculo en el bulbo duodenal. Se realizó gastrotomía con extracción de litiasis a nivel duodenal y a nivel vesicular, se realizó rafia con puntos separados y se colocó drenaje. El síndrome de Bouveret, ocasionado por un cálculo se aloja en el bulbo y causa obstrucción gástrica secundario a una fistula colecistoduodenal o coledocoduodenal. Se presenta entre el 1 y 3% de todos los casos de íleo biliar, con mayor frecuencia en mujeres de 70 a 75 años.
Clínicamente se presenta con dolor epigástrico, náuseas y vómitos.
El tratamiento quirúrgico es una opción y la conducta terapéutica debe individualizarse en cada paciente.
Práctica quirúrgica en Uruguay durante la Pandemia COVID-19
Authors: Perdomo Pérez Mauro Andrés , Ruso Martínez Luis , Olivera Pertusso Eduardo , Rodríguez Temesio Gustavo , González González Daniel 
Published: December 2020

A causa de la pandemia por infección SARS-CoV-2 en Uruguay, se establecieron pautas y recomendaciones que modificaron radicalmente las prestaciones quirúrgicas habituales. Estas medidas se basaron en recomendaciones fundadas en la experiencia internacional previa, tendientes a realizar solamente cirugías de urgencia/emergencia, pacientes oncológicos e impostergables.
Objetivo. Analizar el impacto de la pandemia COVID-19 en la práctica de los especialistas quirúrgicos en nuestro país.
Material y métodos. Se realizó una encuesta que fue difundida a través de las sociedades científicas quirúrgicas de Uruguay, que se mantuvo abierta por un periodo de 10 días (20 al 30 de abril de 2020), recabándose un total de 262 respuestas, de las cuales 212 fueron completas.
Resultados: El 52% de los encuestados realizo cirugías programadas y el 55% realizo abordajes video-asistidos; el 51% de quienes practicaron cirugías negó haber tomado medidas de protección adicionales durante las mismas.
Veintitrés (9%) de los especialistas operaron pacientes sospechosos de portar Covid.19 y 3 (1.1 %) casos positivos COVID-19.
El 57% se consideró “parcialmente capacitado” y 21% “poco capacitado” (21%), mientras que el 19 % se definió como “totalmente capacitado” para la utilización de los elementos de protección.
Conclusiones: Se verifico alto acatamiento a las medidas de suspensión de las cirugías de coordinación (descenso de 82). Las cirugías en pacientes cursando COVID-19 fue excepcional y la frecuencia de casos con sospecha de enfermedad fue baja.
El exceso de información y la existencia de múltiples protocolos han determinado una considerable heterogeneidad en la implementación de las medidas de protección y baja participación en actividades de capacitación.
Pattern of Stroke among Adult (A-MMD) and Childhood Onset (C-MMD) Moyamoya Disease
Authors: Hasan ATM Hasibul , Rahman Kazi Mohibur , Khan Sharif Uddin , Hakim Shakir Hussain , Habib Mansur , Alam Md Badrul , Mohammad Quazi Deen 
Published: December 2020

Background: Though relatively rare, moyamoya disease (MMD) may have varied presentation in different age group. Different stroke types are major presentation of this enigmatic disease. Objective: The aim of this study was to compare the stroke subtypes among adult (A-MMD) and childhood onset (C-MMD) patients with Moyamoya disease (MMD).
Methodology: This was a hospital based observational study, conducted in the department of Neurology, Dhaka Medical College Hospital, Bangabandhu Sheikh Mujib Medical University and National Institute of Neurosciences and Hospital, Dhaka, Bangladesh in between July, 2007 to June, 2016. Sample size included 36 children and 14 adult patients of MMD presenting with either ischemic or hemorrhagic stroke, within one month of the index event.
Result: Majority of participants were below 10 years of age with a mean age at onset of 16.56(±10.6) years. There was a female predominance. Patients younger than 20 years, presented mostly with ischemic stroke (32 versus 4 patients); whereas those above 20 years of age presented mostly with hemorrhagic stroke (6 versus 8 patients). The difference was statistically significant (p value = 0.006). Large artery infarct (15) and hemodynamic infarct (17) were common among patients in children; whereas intracerebral hemorrhage (dICH, lICH, IVH among 3, 4 and 1 patients respectively) was frequent (8) among the adult (p value = 0.006).
Conclusion: While different pattern of ischemic stroke is common among children with MMD, the adults present mostly with hemorrhagic stroke subtypes.
Journal of National Institute of Neurosciences Bangladesh, 2020;6(2): 87-90