bluuebunny/crossref_metadata_2025_split huggingface dataset:
INVESTIGATION OF WELDING PROCESS OF VITRIMER-BASED MATERIAL: MESO-SCALE SIMULATION
Authors: Комаров Павел Вячеславович , Малышев Максим Дмитриевич 
Published: December 2022

Рассматривается самовосстанавливающийся эпоксидный материал на основе диглицидилового эфира бисфенола A и отвердителя трикарбоновой жирной кислоты, относящийся к новому классу полимеров, называемых витримерами. Восстановление целостности таких систем при повреждениях происходит благодаря реакции обмена ковалентными связями между сомономерами, образующими полимерную сетку. В нашей предыдущей работе мы разработали модель данного материала на основе метода реакционной диссипативной динамики частиц. В данной работе мы применяем нашу модель для изучения процесса сварки образцов витримера, разрезанного на две части. Контроль целостности структуры систем проводился с помощью топологического анализа посредством расчета распределений по длинам простых циклов и плотности числа несущих нагрузку цепей. Показано, что скорость восстановления целостности систем определяется концентрацией катализатора и степенью сшитости полимера. Полученные результаты также свидетельствуют, что в случае высокой степени сшитости полимера, а также низкой концентрации катализатора структура системы получается сильно неоднородной.
A self-healing epoxy material is considered, based on bisphenol A diglycidyl ether and a tricarboxylic fatty acid hardener, belonging to a new class of polymers called vitrimers. The restoration of the integrity of such systems in the case of a damage occurs due to the exchange reaction of covalent bonds between the comonomers forming a polymer network. In our previous work, we have developed a model of this material based on the method of reactive dissipative particle dynamics. In this work, we apply our model to study the welding process of vitrimer samples cut into two parts. The control of the integrity of the structure of the systems was carried out using a topological analysis by calculating the distributions over the lengths of simple cycles and the density of the number of load-bearing circuits. It has been shown that the rate of restoration of the integrity of the systems is determined by the concentration of the catalyst and the degree of crosslinking of the polymer. The results obtained also indicate that in the case of a high degree of crosslinking of the polymer, as well as a low catalyst concentration, the structure of the system is highly inhomogeneous.
PHASE FORMATION IN HIGH-CHROMIUM STEEL UNDER ELECTRON-ION-PLASMA TREATMENT
Authors: Иванов Юрий Федорович , Клопотов Анатолий Анатольевич , Лопатин Илья Викторович , Иванова Ольга Викторовна , Петрикова Елизавета Алексеевна , Петюкевич Мария Станиславовна , Никоненко Елена Леонидовна 
Published: December 2022

Осуществлено поверхностное легирование методом одноциклового и многоциклового (5 циклов «напыление-облучение» в каждом цикле толщина пленки титана 0,5 мкм) высокоскоростного плавления системы «пленка (Ti)/(сталь 20X23H18) подложка» импульсным электронным пучком. Азотирование (793 К; 1, 3 и 5 час.) проводили в условиях реализации элионного (электронного и ионного) режима обработки. Рассмотрены изотермические сечения тройных систем диаграммы состояния сплава Cr - Fe - Ni - Ti - N, формирующегося на различных стадиях комплексной обработки стали. Исследования показали, что, во-первых, облучение стали импульсным электронным пучком сопровождается формированием структуры высокоскоростной ячеистой кристаллизации твердого раствора на основе γ - Fe; во-вторых, азотирование стали в исходном состоянии сопровождается формированием нитридов железа FeN и хрома CrN суммарным содержанием 79,8 масс.%; в-третьих, предварительное облучение стали импульсным электронным пучком приводит к снижению скорости нитридообразования при последующем азотировании; суммарное содержание нитридов 53 масс.%; в-четвертых, независимо от количества циклов легирования (концентрации титана в поверхностном слое) после пяти часов азотирования в образцах формируется поверхностный слой, образованный нитридами хрома и железа (1 цикл легирования) или нитридами хрома и титана (5 циклов легирования).
The surface alloying was carried out by single-cycle and multi-cycle (5 cycles «sputtering-irradiation», in each cycle the thickness of the titanium film 0,5 µm), i.e. high-speed melting of the system «film (Ti)/(steel AISI 310S) substrate» by pulsed electron beam. Nitriding (793 K; for 1, 3 and 5 hours) was carried out under conditions of realization of the elion (electron and ion) treatment mode. The isothermal cross sections of the ternary systems of the state diagram of the Cr - Fe - Ni - Ti - N alloy formed at different stages of the complex treatment of steel are considered. It is shown that (1) irradiation of steel by a pulsed electron beam is accompanied by the formation of a structure of high-speed cellular crystallization of solid solution based on γ-Fe; (2) nitriding of steel in the initial state is accompanied by formation of nitrides of iron FeN and chrome CrN with a total content of 79,8 wt.%; (3) pulsed electron-beam pre-irradiation of steel leads to a decrease in the rate of nitride formation during subsequent nitriding; the total nitride content of 53 wt.%; (4) regardless of the number of alloying cycles (titanium concentration in the surface layer) after five hours of nitriding in the samples formed a surface layer of nitrides of chromium and iron (1 cycle of doping) or nitrides of chromium and titanium (5 cycles of doping).
ZINC STANNATE NANOSTRUCTURES FOR FAST RESPONSE GAS SENSORS
Authors: Шомахов Замир Валериевич , Налимова Светлана Сергеевна , Шурдумов Беслан Замирович , Максимов Александр Иванович , Мошников Вячеслав Алексеевич 
Published: December 2022

Рассмотрены возможности использования наноструктур станната цинка в качестве чувствительных элементов газовых сенсоров с высоким быстродействием, которые представляют большой интерес для использования в самых разных областях применения от обнаружения токсичных веществ до мониторинга качества воздуха или медицинской диагностики. Синтез наноструктур станната цинка проводили при гидротермальной обработке наностержней станната цинка в растворе станната калия и мочевины при различных концентрациях прекурсоров. Химический состав поверхности образцов проанализирован методом рентгеновской фотоэлектронной спектроскопии. Показано, что в результате гидротермальной обработки на поверхности наностержней оксида цинка появляются ионы Sn. Исследование газочувствительных характеристик проведено при воздействии паров изопропилового спирта при температурах 156°С и 310°С. Показано, что максимальный отклик при 310°С к 1000 млн изопропилового спирта составляет 8,24. При этом образцы станната цинка обладают высоким быстродействием в 23 с.
The possibilities of using zinc stannate nanostructures as sensitive elements of fast response gas sensors are considered, which are of great interest for use in a variety of applications from the detection of toxic substances to air quality monitoring or medical diagnostics. The synthesis of zinc stannate nanostructures was carried out by hydrothermal treatment of zinc stannate nanorods in a solution of potassium stannate and urea at different concentrations of precursors. The chemical composition of the sample surface was analyzed by X-ray photoelectron spectroscopy. It is shown that as a result of hydrothermal treatment, Sn+ ions appear on the surface of zinc oxide nanorods. The study of gas-sensitive characteristics was carried out under the influence of isopropyl alcohol vapors at temperatures of 156°C and 310°C. It is shown that the maximum response at 310°C to 1000 ppm of isopropyl alcohol is 8,24. At the same time, the zinc stannate samples have a fast response of 23 s.
NANOSTRUCTURES OF RARE-EARTH METALS IN THE COALS OF THE SHUBARKOL DEPOSIT
Authors: Юров Виктор Михайлович , Ибрагимова Динара Армияевна , Портнов Василий Сергеевич , Маусымбаева Алия Думановна 
Published: December 2022

Редкие металлы углей месторождения Шубарколь имеют толщину поверхностного слоя около 3 нм, т.е. представляют собой наноструктуру. Толщина поверхностного слоя самого угля равна около 0,2 мкм, т.е. представляет собой мезоструктуру. Радиус поры в угольном веществе равен 30,6 нм, что соответствует мезопорам, а удельная поверхность угля равна 857 м/г. Редкие металлы либо в виде чистых примесей (~3 нм), либо в виде окислов (~7 нм), либо в виде органических примесей (~1-3 нм), свободно входят в мезопоры угля. Формы нахождения урана и редких металлов в углях Шубаркольского месторождения свидетельствуют о том, что их концентрирование в угле обусловлено ведущей ролью гидрогенного механизма. В слое d(I) все редкие металлы представляют собой нанолюминофоры, которые можно рассматривать как чувствительные молекулярные зонды для исследования структуры угля. Подчеркнуто, что влияние размерных эффектов на кинетику затухания люминесценции и аномальную термализацию редких земель нетрудно получить экспериментально. Фрактальная размерность угля Шубарколя равна 2,60, что ниже, чем у антрацита - 2,74. В мезопористой структуре угля Шубарколя весьма развита адсорбция примесей редких металлов вследствие формирования на поверхности этих мезопор адсорбционных слоев, которые приводят к объемному заполнению этих пор путем механизма капиллярной конденсации.
The rare metals of the Shubarkol coal deposit have a surface layer thickness of about 3 nm, i.e. are nanostructures. The thickness of the surface layer of the coal itself is of about 0,2 pm, i.e. it is a mesostructure. The pore radius in the coal substance is 30,6 nm, which corresponds to mesopores, and the specific surface area of coal is 857 m/g. Rare metals, either in the form of pure impurities (~ 3 nm), or in the form of oxides (~ 7 nm), or in the form of organic impurities (~ 1-3 nm), freely enter into mesopores of the coal. The forms of occurrence of uranium and rare metals in the coals of the Shubarkol deposit indicate that their concentration in the coal is due to the leading role of the hydrogenous mechanism. In the d(I) layer, all rare metals are nanoluminophores, which can be considered as sensitive molecular probes for studying the structure of coal. It is emphasized that the influence of size effects on kinetics of the luminescence decay and anomalous thermalization of rare earths can be easily obtained experimentally. The fractal dimension of Shubarkol coal is 2,60, which is lower than that of anthracite - 2,74. In the mesoporous structure of Shubarkol coal, the adsorption of rare metal impurities is highly developed due to the formation of adsorption layers on the surface of these mesopores, which lead to volumetric filling of these pores by mechanism of the capillary condensation.
MODIFICATION OF FIBER CELLULOSE MATERIALS WITH AMORPHIZED CALCIUM PHOSPHATES AND COPPER NANOPARTICLES
Authors: Мусская Ольга Николаевна , Крутько Валентина Константиновна , Кулак Анатолий Иосифович , Крутько Евгений Николаевич 
Published: December 2022

Этерификацией поверхности целлюлозных носителей фосфорной кислотой в присутствии мочевины получены волоконные материалы, характеризующиеся повышенной степенью набухания в водных средах (в 1,1-1,5 раза). Боргидридным методом с использованием натриевой соли карбоксиметилцеллюлозы в качестве полимера-стабилизатора синтезированы наночастицы меди и их композиты с аморфизированными фосфатами кальция. Полученные коллоидные растворы меди и их композиты с гидроксиапатитом характеризуются стабильностью от нескольких суток до 2 месяцев. Выявлено, что модифицирование целлюлозных (исходных и фосфорилированных) материалов иммерсионным методом с использованием водных составов, содержащих аморфизированные фосфаты кальция, наночастицы меди либо композиты на их основе, в присутствии натриевой соли карбоксиметилцеллюлозы и аскорбиновой кислоты при величине pH 6 и 11 приводит к снижению кристалличности полимерного носителя. Методом ИК-спектроскопии показано, что аморфизация модифицированных волоконных целлюлозных материалов обусловлена изменением статической однородности системы водородных связей в структуре полимера.
Etherification of the surface of cellulose carriers with phosphoric acid in the presence of urea yielded fiber materials characterized by an increased degree of swelling in aqueous media (by a factor of 1,1-1,5). The copper nanoparticles and their composites with amorphized calcium phosphates were synthesized by the borohydride method using the sodium salt of carboxymethyl cellulose as a stabilizer polymer. The obtained colloidal solutions of copper and their composites with hydroxyapatite are characterized by stability from several days to 2 months. It was found that the modification of cellulose materials (initial and phosphorylated) by the immersion method using aqueous compositions containing amorphized calcium phosphates, copper nanoparticles or composites based on them in the presence of sodium carboxymethylcellulose and ascorbic acid at pH 6 and 11 leads to a decrease in the crystallinity of the polymer carrier. It has been shown by IR spectroscopy that the amorphization of modified fiber cellulose materials is due to a change in the static homogeneity of the system of hydrogen bonds in the polymer structure.
OBTAINANIG AND STUDY OF THE MATERIAL BASED ON HYDROXYAPATITE AND POLYCAPROLACTONE FOR EXTRUSION THREE-DIMENSIONAL PRINTING
Authors: Пермяков Никита Вадимович , Лебедева Анастасия Игоревна , Мараева Евгения Владимировна 
Published: December 2022

Работа посвящена поиску научно-технического решения по созданию филаментов на основе гидроксиапатита и поликапролактона для экструзионной трехмерной печати. Порошки гидроксиапатита получены методом химического осаждения с использованием микроволнового излучения, определен средний размер частиц в порошке. Предлагаются варианты создания филамента методом экструзии на основе композиции гидроксиапатита и поликапролоктона для последующей печати скаффолдов - временных каркасов, необходимых для формирования новых функциональных тканей. Получены изображения поверхности гидроксиапатита кальция с помощью сканирующего зондового микроскопа для оценки параметров шероховатости поверхности, являющейся одним из важнейшим факторов для успешной адгезии клеток к поверхности скаффолда при процессах остеоинтеграции.
The work is devoted to the search for a scientific and technical solution for the creation of filaments based on hydroxyapatite and polycaprolactone for extrusion three-dimensional printing. Hydroxyapatite powders were obtained by chemical precipitation using microwave radiation, and the average particle size in the powder was determined. Options for creating a filament by extrusion based on a composition of hydroxyapatite and polycaproloctone for subsequent printing of scaffolds (temporary scaffolds necessary for the formation of new functional tissues) are proposed. Images of the surface of calcium hydroxyapatite were obtained using a scanning probe microscope to assess the parameters of surface roughness, which is one of the most important factors for successful cell adhesion to the scaffold surface during osseointegration processes.
TUTELA JURISDICIONAL E SUSTENTABILIDADE: UM CAMINHO MULTIDIMENSIONAL PARA A PROMOÇÃO DO DESENVOLVIMENTO
Authors: Costa Izadora Caroline , Sonego Rezende Maria , Etinger de Araujo Júnior Miguel 
Published: December 2022

A pesquisa aborda o papel da tutela jurisdicional para a consagração do Estado de Direito Ecológico, sob o enfoque do dever ético-jurídico de assegurar um meio ambiente favorável ao bem-estar das gerações presentes e futuras. Por meio da atribuição do status jurídico-constitucional de direito fundamental ao meio ambiente ecologicamente equilibrado, a sustentabilidade tornou-se o princípio balizador de todo o ordenamento jurídico, consagrando a proteção ambiental como uma política pública de expressão nacional. Neste sentido, será examinado o posicionamento adotado pelo Supremo Tribunal Federal na ADPF nº 708 quanto à impossibilidade de contingenciamento das receitas que integram o Fundo Clima.
Challenges Of Exchange Rate Fluctuation And Cpo Prices In Indonesia Palm Oil Industry
Authors: GS Achmad Daengs , Rahmawati Annisa , Pandin Maria Yovita R 
Published: December 2022

Objective : This study points to analyze the challenges of Rupiah Exchange Rates and International CPO Prices to Indonesia's CPO Export Volume.
Design /methodology/approach : this research exercises explanatory type under a quantitative approach. Data collection techniques in this study were done by time series techniques. The data analysis technique used is Structural Equation Model (SEM) with the Smart Partial Least Square (PLS) tool.
Findings : The study results indicate that: (1) Rupiah Exchange Rates do not have a significant effect on Indonesia's CPO Export Volume; (2) International CPO prices have a significant effect on Indonesia's CPO Export Volume.
Practical implications : intensify business in economy sector in order to reach the lower class people.
Paper type : research paper

Keywords: Rupiah Exchange Rates, International CPO Prices, Export Volume
Motivation And Competency Factors Influencing Tutors Performance In Educational Equality Of Study Group Musi Banyuasin Regency
Authors: Anggraini Desi Ulpa , Marsih Yeni , Buwono Achmad Kartiko , Ardiansyah Aan 
Published: December 2022

The lack of motivation and competence in the performance of tutors in the education equality of study groups in the Non-Formal Education Unit of the Musi Banyuasin Regency was the background for this research. The purpose of this study is to prove the influence of motivation and competence on the tutor's performance. The population in this study were all Group Equality Tutors, total to 70 people. Primary data used from questionnaires by respondents. Sample selection is done by simple random sampling. Data management techniques used the SPSS version 20 program and tested it using multiple linear regression equations. The results of the study simultaneously produce an R2 (R square) of 0.169 indicating the variable competence and work motivation affect tutor performance by 16.9%, and the remaining 83.1% is influenced by other variables. While partially there is an influence between motivation on performance that produces a tcount of 3.501, and there is no influence between competence on performance with the result of a tcount of 1.820.
Determination of Performance in Sharia Banks Based on Islamic Corporate Governance and Investment Account Holders
Authors: Africa Laely Aghe 
Published: December 2022

Purpose: This study aims to analyze the effect of ICG (Islamic Corporate Governance) and IAH (Investment Account Holders) on the performance of Sharia banks in Indonesia as proxied by Mudharabah financing, Musyarakah financing, ROA (Return on Assets), and ROE (Return on Equity). 110 data used in this study are in the form of financial statements of Sharia banks in Indonesia for the period of 2010 – 2019
Design/methodology/approach: This study uses quantitative method and multiple regression analysis with SPSS Version 23
Findings: The results of this study show that ICG and IAH have an effect on Mudharabah financing, Musyarakah financing, ROA, and ROE
Research limitations/implications: This study is expected to serve as a guideline for banking management in making policies on company performance, as measured by Mudharabah financing, Musyarakah financing, ROA and ROE, and corporate governance, as measured by ICG, so that Islamic banking companies have their own guidelines in determining policies related to banking operations that are adjusted to the decisions of the Financial Services Authority of the Republic of Indonesia (OJK).
Practical implications: State your implication here.
Originality/value: originality
Paper type: Research paper
Foreign Tourists Arrival Forecasting at Major Airports in Indonesia:
Authors: Ponziani Regi Muzio 
Published: December 2022

Purpose: This research purports to forecast the number of foreign tourists arriving at major airport in Indonesia. The airports chosen are Soekarno Hatta, Juanda, I Gusti Ngurah Rai, and Kualanamu international airports.
Design/methodology/approach: The data used were foreign tourists arrival at major airports located in Jakarta, Surabaya, Medan, and Denpasar. The data extended from January 2014 until December 2018. Two time-series methods were employed, namely Holt-Winter Seasonality and Exponential Smoothing with maximum likelihood. The forecasts would reveal the fitted numbers of foreign tourists arriving from January 2019 until December 2019. The fitted numbers would then be compared to the actual numbers of January 2019 to December 2019.
Findings: The results showed that, overall, Holt-Winters seasonality excel at forecasting foreign tourists arrival at Soekarno Hatta and Juanda international airports. While Exponential Smoothing perform better for prediction at I Gusti Ngurah Rai and Kualanamu international airports. The MAPE for Holt-Winters at Soekarno Hatta and Juanda international airports were 26.1585% and 14.538%. The MAPE for Exponential Smoothing at at I Gusti Ngurah Rai and Kualanamu international airports were 7.76% and 15.6791%.
Research limitations/implications: Forecasting for foreign tourist arrival at Soekarno Hatta and Juanda international airports should employ Holt-Winters approach. Forecasting for foreign tourists arrival at I Gusti Ngurah Rai and Kualanamu international airports should employ Exponential Smoothing with maximum likelihood.
Practical implications: Certain forecasting methods work better than the others at certain international airports. Many forercasting methods are available. Two methods are specifically prominent for detecting seasonality and trend, i.e Holt-Winters and Exponential Smoothing with maximum likelihood.
Originality/value: Most research focus on one method at a time. This research compares two methods so that we can know better which method is suitable for certain airports. Four international airports are sampled in this study. Not many research focus on several places at a time.
Paper type: Research paper
Differentiation Strategy of Tofu and Tempeh Micro, Small, and Medium Enterprises for Food Security During The Covid-19 Pandemic
Authors: Widawati Etty , Gastri Andrik 
Published: December 2022

Purpose: To achieve the level of prosperity is not an easy thing. Becoming an entrepreneur is not an alternative profession, but being an entrepreneur is a strategic choice that must be made with a firm and strong determination.
Findings: The essence of entrepreneurship is to build an entrepreneurial atmosphere so that students like challenges, are creative, innovative, and have the courage to take or manage risks (character).
Research limitations/implications: Imagine if all graduates in Indonesia had entrepreneurial characters, of course Indonesia would rise to become an authoritative country in the eyes of the world. Indonesia will have strong competitiveness, its economy will be independent, and its image will improve.
Practical implications: The formulation of the problem in this study is how the entrepreneurial attitude of students so far and how the needs of teachers and students for teaching materials that can improve the entrepreneurial attitude of students.
Paper type: Research paper.