bluuebunny/crossref_metadata_2025 huggingface dataset:
The Managerial Competence of School Principals in Improving the Quality of Secondary Education
Authors: Nargis Syarifah , Niswanto  , Ismail  , Ibrahim  , Firmansyah Juli
Published: October 2024

Improving student learning outcomes depends on teacher involvement in learning and the principal's good managerial competence in carrying out managerial functions in the school environment. This research aims to find information about the principal's plan to improve the quality of education in Banda Aceh City State Middle Schools and to describe the managerial function of school principals in enhancing the quality of education in Banda Aceh City State Middle Schools.This research uses a field research approach, namely research, where researchers go directly into the field to look for materials close to the truth. The study was conducted directly at State Middle Schools in Banda Aceh City, namely State Middle School 1 and State Middle School 12 in Banda Aceh City. The results of the research prove that the managerial competence possessed by school principals at SMPN 1 and SMPN 12 Banda Aceh City has so far been the basis or guide in the process of placing school principals, which is based on planning ability, organizing ability, ability to carry out school activities and ability to carry out supervision of every activity at school. School principals who have reliable managerial competence can influence progress in the educational environment, teacher performance, the effectiveness of school governance, and the achievement of better educational outcomes.
Comparison of transpiration activity of Quercus robur L. and Acer campestre L. trees under different conditions of moisture supply in the Viiskova ravine
Authors: Bessonova Valentіna , Yakovlieva-Nosar Svitlana
Published: October 2024

Determining the role of trees in the water cycle and their impact on soil moisture and atmospheric humidity is crucial. This study aimed to investigate the patterns of leaf transpiration in Quercus robur and Acer campestre in a maple-oak forest under varying water supply conditions. The research was conducted in the lower third of the lower third of the north-facing slope and the middle third of the south-facing slope in the Viiskova ravine. A silvicultural and taxation survey of model trees was conducted on both sample plots, where the plantations are moderately dense. The diurnal course of transpiration patterns of these deciduous species was studied throughout the vegetation period. This physiological process reached its highest values in both species on the north-facing slope during the summer months, especially in Quercus robur. On the south-facing slope, in May and June, the average daily transpiration values in both species were almost indistinguishable. During the remaining months of the vegetation period, the intensity of water evaporation by Quercus robur leaves was statistically higher than that of Acer campestre. It was established that on the south-facing slope, under more arid conditions, this process is less active. This pertains to the daily transpiration loss of water by leaves per unit of their mass, monthly transpiration, and the intensity of this process per tree. The difference between the results of water loss by the leaves of a single Quercus robur and Acer campestre tree is significant and is attributed to the lower transpiration rate of Acer campestre, except in May and June under xerophytic conditions, as well as the smaller leaf mass of this species. Both Quercus robur and Acer campestre are hydrostable medium-transpiring species. The maple forest on the north-facing slope evaporates 30.6% more moisture per 1 ha per vegetation period than on the south-facing slope. The results obtained indicate that Acer campestre in a maple-oak forest, under fresh and dry forest-growing conditions, does not pose a significant competition for moisture for Quercus robur when they grow together. The results obtained can be used to develop effective forest management strategies in maple-oak forest
Analysis and forecasting of the scale and impact of forest fires on ecosystems of Ukraine
Authors: Moroz Vira
Published: October 2024

Forest fires are one of the most significant environmental problems that have a major impact on biodiversity and climate conditions. The purpose of the study was to investigate the impact of military operations on the ground cover in the area of the Bekhy forestry, which was disturbed by fire. It was revealed that for the period 2022-2023, 15 forest fires were recorded on the territory of the Korosten forest hunting enterprise of the state enterprise “Forests of Ukraine”, while the total area covered by fires was 15.13 ha. Overall, the number of fires increased from 5 to 10, but the total area covered by fires decreased from 12.1 to 3.03 ha. At the site of fires in 2022, the pH level increased to lower horizons, with the highest values at microhills (7.55) and microdepressions (7.35). There was a slight increase in the organic carbon content in the upper humus horizon of soils (0.42% on microhills and 0.46% on microdepressions). Bekhy forestry suffered a large forest fire in May 2023, which covered an area of 1.2 ha. The fire hazard assessment of each quarter was carried out separately. In the 50th and 51st compartments, Scots pine was the most fire-prone type of plantings. The 2023 fire site also showed an increase in pH in the lower horizons, with the highest values in microhills (7.35) and microdepressions (7.55). The 2023 fire site showed a decrease in organic carbon content compared to the background sites, with minimal values in the lower parts of the soil profile (0.33% on microdepressions and 0.38% on microhills). The results of the study can be used to develop and implement environmental measures and programmes aimed at restoring forests damaged by fire
Does the education and experience of CEO matter?
Authors: Zagudalova E.V. , Grigorieva S.A. , Zueva S.A.
Published: October 2024

This paper contributes to the present literature by examining the impact of CEO education and experience on M&A performance in Russia. The study is based on a sample of 172 M&A transactions over 2000–2021. We use the event study method to assess the performance of M&A deals and regression analysis to reveal the effects of CEO education and experience on M&A outcomes. CEO education is defined by three variables: financial or economic education; technical education; PhD or MBA status of CEO. CEO’s experience is described by the variables, reflecting previous experience in M&A deals and his (her) industry experience in the target company’s industry. Our results show that economic/financial education of CEO obtained during the Soviet Union has a negative impact on the performance of transactions, while technical education has a positive effect. Interesting positive results were obtained about the presence of an MBA and PhD level in the education of the CEO. Our results also show that the previous deal experience increases the deal performance, while the CEO experience in the target company’s industry reduces it.

Данная статья вносит вклад в литературу, исследуя влияние образования и опыта генерального директора (CEO) на эффективность сделок слияний и поглощений (M&A) в России. Исследование основано на выборке 172 сделок, совершенных в период 2000–2021 гг. Мы используем метод событий (event study) для оценки эффективности сделок M&A и регрессионный анализ для выявления влияния образования и опыта генерального директора (CEO) на успешность слияний и поглощений. Образование CEO определяется тремя переменными: финансовое или экономическое, техническое образование, PhD или MBA. Опыт генерального директора описывается переменными, которые отражают предыдущий опыт участия конкретного CEO в сделках слияний и поглощений и его (ее) опыт в отрасли, в которой ведет свою деятельность компания-цель. Наши результаты показывают, что экономическое/ финансовое образование генерального директора, полученное в Советском Союзе, отрицательно влияет на результативностьсделок, в то время как техническое образование положительно влияет на успешность или эффективность слияний и поглощений. Интересные положительные результаты были получены в отношении наличия степени MBA и PhD в образовании CEO. Наши результаты также показывают, что предыдущий опыт заключения сделок повышает эффективность слияний и поглощений, в то время как опыт работы генерального директора в отрасли целевой компании не способствует успеху в сделках.
Анализ экономической мысли Запада в «Китайском экономическом учении» Чан Кайши
Authors: Борох О.Н.
Published: October 2024

В статье исследуется книга Чан Кайши «Китайское экономическое учение» в контексте истории экономической мысли Китая 1940‑х годов. Обоснованию необходимости участия государства в экономике ради обеспечения народного благосостояния служили сопоставления китайской мысли с экономической наукой Запада. Популярность перевода на английский язык, истолковавшего содержание книги как отражение фашистских и феодальных устремлений китайского лидера, долгое время препятствовала ее объективной оценке. На основании изучения первоисточника были выявлены основные направления сравнения экономических идей Китая и Запада: акцент на целом или на индивиде, человеческие желания либо рациональность как исходная точка построения теории. Критика в адрес марксизма и западного либерализма была дополнена указанием на соответствие критериям китайского экономического учения западных поисков в сфере экономики благосостояния (Веблен, Уорд, Гобсон), способной выйти за рамки теории ценности и возвыситься над стремлением к прибыли. Обсуждавшие в 1944 г. «Китайское экономическое учение» экономисты призвали сделать выбор между экономической наукой и политикой, исправить трактовки западных экономических концепций, и даже отказаться от дальнейшего переиздания книги. Продемонстрировано, что работа Чан Кайши стала частью поиска пути создания китайской экономической науки с учетом национальной специфики и культурной традиции. Современные усилия, направленные на построение «экономической науки с китайской спецификой», подтверждают, что использование традиционной терминологии затрудняет интернационализацию китай‑ ских экономических идей.

The paper examines Chiang Kai‑shek’s book “Chinese Economic Teaching” in the context of the history of Chinese economic thought of the 1940s. The need for state participation in the economy for ensuring people’s livelihood was substantiated by comparisons of Chinese thought with Western economic science. The popularity of the English translation, which interpreted the contents of the book as a reflection of the “fascist” and “feudal” aspirations of the Chinese leader, long prevented its objective assessment. Based on the study of the primary source, the main directions for comparing the economic ideas of China and the West were identified: an emphasis on the whole or on the individual, human wants or rationality as the starting point for constructing a theory. Criticism of Marxism and Western liberalism was supplemented by indicating that the criteria of Chinese economic teaching correspond to Western searches in the field of welfare economics (Veblen, Ward, Hobson), capable of going beyond the theory of value and the profit‑seeking. It is demonstrated that Chiang Kai‑shek’s book became part of the search for a way to construct Chinese economic science taking into account national specifics and cultural traditions. Contemporary efforts to build “economics with Chinese characteristics” confirm that the use of traditional terminology makes difficult to internationalize Chinese economic ideas.
Теоретическое измерение экономического суверенитета
Authors: Афонцев С.А.
Published: October 2024

В статье рассматриваются проблемы и перспективы концептуализации понятия экономического суверенитета в рамках современной экономической науки. Рассмотрены четыре направления исследований экономического суверенитета, опирающиеся на его интерпретацию как вклада экономических факторов в обеспечение национального суверенитета; автономии национальной экономической политики; самостоятельности в достижении целей экономического развития («суверенное раз- витие»); а также возможности успешного противостояния негативным внешним шокам (торговые войны и экономические санкции). Показано, что для соответствующих исследовательских направлений характерен разный уровень теоретической и аналитической разработок проблемного поля. В настоящее время приходится констатировать, что прочный теоретический базис для анализа экономического суверенитета отсутствует. Его отдельные фрагменты уже существуют (особенно в сфере изучения автономии националь- ной экономической политики), однако речь идет именно о фрагментах, а не об интегрированной концептуальной платформе. Наибольшие надежды связаны с развитием теоретических основ изучения техно- логического суверенитета, хотя степень воплощения этих надежд в реальность будет в решающей мере зависеть от готовности исследователей выйти за пределы круга чисто прикладных проблем и подняться на уровень концептуальных обобщений.

The article addresses the problems and prospects associated with the introduction of economic sovereignty notion to economic research. Four directions of such an introduction are identified focusing on such aspects as contribution of economic factors to maintaining national sovereignty; autonomy of economic policy; self-reliance in key aspects of economic development; and economic sustainability to negative external shocks like trade wars and sanctions. These research fields are shown to be characterized by unequal quality of theoretical and analytical achievements. At the moment, integrated theoretical basis for research in economic sovereignty is lacking, although some noteworthy conceptual developments can be traced in studies of factors affecting the degree of autonomy of national governments in economic policy decision making. The largest potential for ‘conceptual breakthrough’ is concentrated in technological sovereignty studies. To exploit this potential, however, economists should go beyond applied research and routine analytics to start a quest for appropriate theoretical generalizations.
Технологический суверенитет — новый вектор научно- технологической политики России
Authors: Ленчук Е.Б.
Published: October 2024

В статье акцентируется внимание на проблемах технологической суверенизации, которая в современных геополитических условиях становится характерной чертой научно-технологической политики многих стран, как технологических лидеров, так и стран, заимствующих технологии, при этом ее причины и целевые установки различаются. Обосновывается объективная необходимость обеспечения технологической суверенизации для России, которая определяется сложившейся высокой степенью зависимости от импорта в технологической сфере, превращающейся в условиях жестких внешних ограничений в преграду для дальнейшего развития страны. Анализируются основные подходы к обеспечению технологического суверенитета страны в рамках проводимой научно-технологической политики страны, закрепленные в нормативно-правовых документах федерального уровня, вскрываются их недостатки и противоречия. Предлагаются основные направления ее совершенствования. Особое внимание отводится проблеме целеполагания научно-технологического развития и его увязки с общими стратегическими целями экономической политики, на основе которых должна быть сформирована критическая масса про- ектов технологического суверенитета и выстроен организационный контур научно-технологического развития.

The article focuses on the problems of technological sovereignty, which in modern geopolitical conditions is becoming a characteristic feature of the scientific and technological policy of many countries, both technological leaders and technologies borrowing countries, since its causes and targets differ. The objective necessity of ensuring technological sovereignty for Russia is substantiated, which is determined by the existing high degree of import dependence in the technological sphere, which is becoming an obstacle to further economic development in the context of severe external restrictions. The main approaches to ensuring the technological sovereignty of the country within the framework of the country’s scientific and technological policy, enshrined in regulatory documents at the federal level, are analyzed, their shortcomings and contradictions are revealed. The directions of its improvement are proposed, while special attention is paid to the problem of goal-setting of scientific and technological development and its alignment with the general strategic goals of economic policy, on the basis of which a critical mass of technological sovereignty projects should be created and an organizational contour of scientific and technological development should be built.
Технологический суверенитет: концептуальные подходы и восприятие российскими академическими экспертами
Authors: Капогузов Е.А. , Пахалов А.М.
Published: October 2024

В статье обсуждается проблематика технологического суверенитета как концепции, сопровождающей технологическое развитие страны. Рассмотрена эволюция идеологем развития от импортозамещения к технологическому развитию в общественно-политическом и академическом дис- курсе. На основе систематического обзора научной литературы проанализированы академические дискурсы исследований технологического суверенитета в отечественной и зарубежной (прежде всего евро- пейской) литературе. Показано, что как в России, так и в странах Евросоюза в последние три года резко выросло число исследований феномена технологического суверенитета, при этом значительная часть этих исследований нацелена на выработку адекватного определения технологического суверенитета. На основе проведенных авторами экспертных интервью с представителями российского академического сообщества представлены элементы восприятия содержания концепции технологического суверенитета отечественными экспертами, в частности, выделены ключевые нарративы как его сущности, так и механизмов обеспечения. Российские эксперты отмечают многообразие трактовок технологического суверенитета и некоторые внутренние противоречия этого понятия.

The article discusses the problems of technological sovereignty as a concept accompanying the technological development of the country. The evolution of development ideologemes from import substitution to technological development in socio-political and academic discourse is considered. Based on a systematic review of scientific literature, academic discourses on technological sovereignty studies in domestic and foreign (primarily European) literature are analyzed. It is shown that both in Russia and in the EU countries, the number of studies on the phenomenon of technological sovereignty increased considerably in the last three years, with a significant part of these studies aimed at developing an adequate definition of technological sovereignty. Based on expert interviews conducted by the authors with the representatives of the Russian academic community, elements of the perception of the essence of the concept of technological sovereignty by the domestic experts are presented; in particular, key narratives of both its essence and mechanisms of provision are highlighted. Russian experts note the diversity of interpretations of technological sovereignty and some internal contradictions of this concept.
Obraz reakcji Ukrainy i Polski wobec rosyjskiego ataku na instytucje kultury. Analiza wybranych przekazów medialnych
Authors: Oliinyk Artur
Published: October 2024

Polska jest jednym z głównych krajów wspierających Ukrainę w wojnie rosyjsko-ukraińskiej. Centrum Pomocy dla Kultury na Ukrainie, które działa w ramach Narodowego Instytutu Dziedzictwa, koncentruje się na dostarczaniu instytucjom kultury na Ukrainie materiałów do zabezpieczenia ich zbiorów oraz pomocy w planowaniu odbudowy zabytków. Działania Polski skupiają się również na informowaniu o zniszczeniach dziedzictwa kulturowego na Ukrainie, organizuje międzynarodowe konferencje i szkolenia. Według oficjalnych danych, do stycznia 2023 roku zniszczonych zostało już ponad 1200 obiektów kultury na Ukrainie. Polska podejmuje działania mające na celu ochronę kultury i wartości europejskich przed rosyjską agresją. Ważną częścią artykułu jest analiza porównawcza głównych polskiego i ukraińskiego przekazów medialnych na temat kultury na Ukrainie.
Європа як відображення світоглядних традицій та сучасних уявлень (Історико-географічний аспект)
Authors: Гудзевич Анатолій , Романюк Іван
Published: October 2024

Стаття присвячена проблемним питанням світоглядної орієнтації у зв’язку з потребою персоніфікації позиціонування Європи як частини світу. Для встановлення означеної проблематики застосовано  низку методів − ретроспективний, хронологічний, періодизації, порівняльно-історичний та інші. Вперше встановлені та нанесені на карту кордони Європи, на тлі інших частин світу, забезпечують: цілісність та «образність», служать основою для розрізнення історико-географічних середовищ планети рівня «частини світу», уможливлюють єдність підходів вчених і практиків (географів, істориків, геологів, культурологів, політиків та ін.). Зокрема, використання Європи, як географічної проекції на земну поверхню, закладає передумови для узгодженого, стандартного групування країн за регіонами з чітким територіальним охопленням і характеристиками (площа, відстань тощо) насамперед у науково-освітній сфері.
Conservative semi-Lagrangian method for continuity equation with various time steps in different parts of computational domain
Authors: Vyatkin Aleksandr V. , Maltsev Aleksand V.
Published: October 2024

The system of Navier Stokes differential equations describes gas flow near rocket nozzle. To find solution of this system in general case, scientists and engineers use numerical methods. Modern numerical methods do not allow engineers to model all features of gas flow. It happened because of sophisticated physical processes and limitations of computational hardware. So, at least where are two ways to improve it: to enlarge hardware or reduce computational complicacy. The global aim of many science investigations is to develop numerical approach with reduced computational complicacy and at the same time without loss of computational accuracy. In 1959, Aksel C. Wiin-Nielsen proposed a new and effective trajectories method for problem of numerical forecasting. In 1966, K. M. Magomedov developed similar approach (method of characteristics) for numerical modelling of space (three dimensional on space) gas flow. In 1982, O. Pironneau showed a new and effective approach for two dimensional approximation of the Navier Stokes problem. It was based on method of characteristics also. Nowadays, these methods are called semi-Lagrangian or Eulerian Lagrangian methods. They use Lagrangian nature of the transport process. To apply this advantage, scientists decompose each equation of Navier Stokes system into three parts: convective part (hyperbolic type), elliptic part and part of right-hand side. Scientists use semi-Lagrangian approach to approximate the convective parts of equations. To develop and test modern algorithms from family of semi-Lagrangian methods, we use continuity equation from the system of Navier Stokes equations. Conservative versions of semi-Lagrangian approach are based on Gauss Ostrogradsky (divergence) theorem. It allows scientists to get conservation low (balance equation) for numerical solution in norm of L1 space. Aim of our investigation is to use different time steps in different parts of computation domain. It enables us to obtain at the same time three advantages: convergence of numerical solution to exact solution, reduction of computational complicacy, implementation of conservation low (balance equation) without weight coefficients. For this purpose we decompose computational domain into two parts (subdomains) and use different time steps in them. Main complication is design algorithm in the boundaries of computational subdomains. We use one dimensional (on space) problem to demonstrate ability of developing numerical method with described advantages. Generalization of considered approach for two- or even three-dimensional cases allows engineers to model gas flow more accurately and without artificial viscosity. It is essentially important in the parts of computational domain with high level of solution gradient.
Algorithm for simulation of vibration effects during track tests
of aircraft and missile technology
Authors: Astakhov Sergey A. , Biryukov Vasily I. , Borovikov Dmitry A.
Published: October 2024

Track high-speed ground tests of products of aviation and rocket technology make it possible to experimentally confirm the aerodynamic and strength characteristics of new aircraft or their components. Experimental installation Rocket rail track 3500, located on the territory of the Federal State Enterprise Scientific Test Range of Aviation Systems named after L. K. Safronov (FKP GkNIPAS named after L.K. Safronov), is a complex hydro-gas-dynamic engineering structure. The main part of this installation is a rail track placed on a special concrete base, which is based on piles to eliminate the influence of viscoelastic ground vibrations. Between the rails, taking into account the profile of the track, a hydrodynamic multi-level tray is made, designed for hydraulic braking of the stored track sled. The movable rocket track sled rests on slip shoes covering the top rail head. On the track sleigh, solid propellant rocket engines and the object of study are placed. The article describes the approach to the calculation of determining the dynamic loads acting on the elastic structure of the track sled with the test object. The design is represented by a schematic spatial model of elastic beams in the form of rods, plates, pipes with equivalent mass and stiffness, interconnected by elastic links. A model of non-stationary aerodynamic forces is formulated taking into account viscosity for numerical calculations of the flow around the sled structure. Programs have been developed and modeling of the aerodynamic interaction in the case of a supersonic air flow around the structure of a rocket sled has been carried out. The results of vibrational accelerations of elements, components of the sled and the test object, depending on the speed of movement, were obtained by calculation. The forms and frequencies of natural free vibrations of the sled structure are determined, and the densities of the vibration acceleration spectra are calculated.
Features of defining the damping function in spacecraft finite-element models
Authors: Kravchunovky Anton P.
Published: October 2024

Dynamic analysis of spacecraft structures is a key item in the process of structure design. For example, a launch vehicle generates the highest loads, including dynamic ones, for most spacecraft structures. Determining of damping parameters is an important component in the analysis of the structure response to mechanical loads. It is therefore very important to be aware of the damping properties of the structure. The characterization of damping is important in making accurate predictions of the frequency response of any loaded structure. The article presents some excerpts from sources devoted to the space technique design, and containing information about damping in structures. The aim of the work was to improve the accuracy of calculations using finite element models. The paper demonstrates the results of the search for a method (form) of setting the damping function in the Femap software that would provide the correct levels of the frequency response of the structure to the loads applied. A finite element model of a cantilever beam was an object of the computational experiment carried out. A frequency table obtained at the modal analysis stage prove to be useful for frequency response analysis. The only one natural frequency in spectrum is enough to implement current study. Further, damping function was set in several ways in order to identify the one that provided the most correct response for the natural frequency under study.
The method of Haar sums for numerical solution of kinematic Poisson equations system that determine an evolution of a spacecraft position
Authors: Kirillov Kirill A. , Ovchinnikova Elena V. , Safonov Konstantin V. , Titov Gennady P. , Khokhlov Anton I. , Gashin Artem  A.
Published: October 2024

In the present paper the method for the numerical solution of Poisson kinematic equations system that determine the evolution of the spacecraft position is proposed. The system of Poisson kinematic equations is used to determine the transition matrix from the coordinate system associated with the spacecraft at the selected time t1 to the coordinate system associated with the spacecraft at the current time t2. This matrix is used in the process of solving problems of determining a three-axis orientation of the spacecraft from the readings of the magnetometer using information about its angular velocities. The proposed method is based on replacing the derivatives of the desired functions in the Poisson kinematic equations by partial sums of series in the scaled Haar system. The partial sums of these series are generalized polynomials in the scaled Haar system. Hence these sums are step (piecewise constant) functions. The estimates of the proposed method error are derived, which reveal that in the case of the coefficients of the equations which are functions matching the Lipschitz condition, the absolute error in calculating each of the elements of the transition matrix from one coordinate system to another is the value O(N–1) at N ® ¥, where N is the number of partitions of the segment [t1, t2] when constructing a grid of nodes involved in this method. It is proved that the complexity of constructing an algorithm for approximating the system of Poisson kinematic properties insignificantly exceeds the complexity of solving this system by Euler method, which has the first order of accuracy. The results of numerical experiments are presented, showing that in certain cases the Haar sums method gives an error that is much smaller than the Euler method, and is almost identical to the errors of the Euler – Cauchy and Runge – Kutta methods of the 2nd order, the complexity of which is approximately two times greater than the complexity of the Haar sums method.
Magnetic impedance in nonstichiometric manganese sulfide
Authors: Kharkov Anton M. , Sitnikov Maksim N. , Aplesnin Sergey S.
Published: October 2024

The role of defects on the dynamic characteristics of manganese sulfide is studied by impedance spectroscopy in the frequency range 102–106 Hz and temperatures 80–500 K. Nonstoichiometry plays an important role in the formation of new transport and magnetic properties, as it leads to electrically inhomogeneous states. The phase composition and crystal structure of nonstoichiometric manganese sulfide were studied on a DRON-3 X-ray unit using CuKα – radiation at room temperature. According to X-ray diffraction analysis, the synthesized compound is single-phase and has a NaCl-type cubic lattice. From the frequency dependences of the impedance components measured in the absence of a field and in a magnetic field, the relaxation time of the current carriers in the Debye model is found. A sharp decrease in the relaxation time and its correlation with conductivity were found. The contribution to the impedance of the active and reactive parts of the impedance at frequencies below and above the relaxation time is established. The capacitance from the impedance hodograph in the equivalent circuit model is determined. In defective manganese sulfide, the temperature-dependent impedance has an activation character. The activation energy is determined in the range 250–500 K, which is attributed to the excitation energy of lattice polarons. The effect of a magnetic field on the dynamic characteristics of current carriers was studied as a result of a change in the impedance components in a magnetic field at fixed temperatures. The impedance increases in a magnetic field and reaches a maximum in the temperature range of charge ordering of vacancies. An increase in the impedance in a magnetic field is explained by a decrease in the diagonal component of the permittivity in a magnetic field in an electrically inhomogeneous medium. The experimental data are explained in the Debye model.
Mathematical model of thermophysical loading of a small-caliber artillery barrel with variant discretization of half-integer layers of the computational domain
Authors: Podkopaev Ilya A. , Podkopaev Aleksandr V. , Dolzhikov Vasily I.
Published: October 2024

In the conditions of continuous financing of the programs of the Ministry of defense of the Russian Federation, the question of finding the most effective ways to modernize weapons and military (special) equipment, the developments in which are maximum and the processes of their improvement can take no more than a few years, is particularly acute. Such products, in particular, include aviation artillery weapons (AAO), the prospects for the use of which remain for the entire period of the army's existence with conventional weapons. The main factor influencing the quality of the AAO functioning is considered to be the thermophysical loading of a small-caliber artillery barrel (hereinafter referred to as the barrel) during firing. The problem of increasing the accuracy of determining the temperature field of the barrel is again updated by tightening the conditions for striking targets. Issues closely related to the intensification of AAO application regimes have come to the fore. These are issues of heating, cooling, thermal strength, wear, barrel survivability, issues of safety and firing efficiency. Despite the methodological evidence of analytical and numerical approaches to formalizing heat transfer in the wellbore, their practical implementation is rather complicated. The physical and mathematical meaning of this reason is as follows: possible instability of solutions; manifestation of oscillations in areas of large gradients; simultaneous presence in the solution regions of supersonic, sonic and subsonic zones; the existence of laminar, turbulent flows and other non-linear formations; non-triviality of setting boundary conditions; the presence of thermal resistance of surfaces, etc. However, the practical needs of ensuring safety and increasing the efficiency of fire operation of AAO dictate the need to obtain a close approximation of the problem under consideration to its possibly existing exact analytical solution. The aim of the work is to improve the mathematical apparatus that simulates the temperature field of the shaft based on a combination of heat transfer methods and mathematical physics. By verifying the reliability of the developed mathematical model (hereinafter referred to as the model, if from the context of the presentation of the material it is clear that we are talking about the proposed tools), the facts of the absence of methodological errors in the formation of the constituent blocks of the model and the increase in the accuracy of determining the thermal loading of the wellbore by 9.4% were established. Based on the accents of the stated problem, the directions for improving the model are argued.
Calculation of the coupling loss factors for the angle connected beams
Authors: Kravchunovky Anton P.
Published: October 2024

The use of the statistical energy method for the analysis of dynamic systems assumes knowing coupling loss factors of the subsystems. Coupling loss factors show how much energy transfers from one subsystem to another. They are included in the system of power-balance equations and must first be determined analytically, experimentally or numerically. The most promising of the listed methods is numerical. In particular, this article uses the finite element method.
The purpose of this study is to determine the coupling loss factors of two subsystems in two versions of their relative position. The basis is the model of an L-shaped connection of two beams, which is quite common in such studies. L-shaped connections of structural parts are prevalent in building structures, but in other areas, such as the development of space and aviation technology, structural elements with an angle other than 90° between them. Since energy methods can also be applied to the aerospace industry, when developing approaches to structural analysis using such methods, it will be useful to know how the energy system parameters, in particular the coupling loss factors, depend on the coupled angle.
The paper considered two configurations of the system: in the first, the beams connected at a right angle, in the second, at an angle of 45°. We calculate the coupling loss factors of the beams for both system configurations. Conclusions of this paper draw about the possibility of extending the result to more complex structures, namely the spacecraft structures.
Automatically Guided Vehicles (AGV) in Agriculture
Authors: Zimmer Domagoj , Šumanovac Luka , Jurišić Mladen , Čosić Arian , Lucić Pavao
Published: October 2024

In this paper, new types of autonomous systems used in agriculture were analysed. The paper shows new self-guiding systems such as AGVs with full autonomy in degrees operation. It explains internal transport and systems of autonomous vehicles in outdoor agriculture. New autonomous systems used outside such as appliance of special navigation systems and their purpose in agriculture are present in this work. Navigation systems with GPS signal and RTK technology, vehicle guidance camera and AI machine vision for manipulation are described. Light and laser technologies for fully autonomous robotic technologies such as LiDAR system in vehicle for detection of the presence of pests and diseases are presented in this paper. The paper emphasized advantages of using AGVs as result of their autonomy, clean power sources without harmful impact on the environment. Navigation in indoor spaces that uses LTE Direct protocol is explained, whereby the Wi-Fi ceiling antenna and wireless APP for horizontal movement of AGVs is shown. The ways of using UAVs for warehouse inventory through web applications with an advanced navigation system guided by AI are given in this work.
Unveiling the Impact of Social Media Usage on Firm Performance
Authors: Tehranian Kian , Khorsand Mohammad-Soroush , Zarei Mehrnaz , Golshan Arani Ghasem , Ghasemi Banabari Hamidreza , Sasani Faraz
Published: October 2024

The current research tended to examine the impact of social media usage on firm performance with the mediating role of organizational agility and innovation capability. The methodology used was descriptive correlation with structural equation modelling. For this purpose, 148 managers, deputies and experts of the German automotive industry participated in the study. Data collection was conducted using a questionnaire while analysis of the data utilized the structural equation modeling based the partial least squares method. The findings suggest that social media usage has a substantial and positive impact on innovation capability, organizational agility, and firm performance. Additionally, innovation capability has a notable positive influence on organizational agility and firm performance. Furthermore, organizational agility significantly contributes to firm performance. Both innovation capability and organizational agility play an important mediating role in the relationship between social media usage and firm performance. Moreover, innovation capability acts as a mediator between social media usage and organizational agility, while organizational agility mediates the effect of innovation capability on firm performance. Thus, it can be inferred that social media usage facilitates improvements in firm performance by enhancing organizational agility and innovation capability.
Movable VOC Removal System
Authors: Park Hoon-Min , Jeon Dong-Hwan , Yoon Jong-Hwa , Yoon Dal-Hwan
Published: October 2024

In this study, we develop a mobile VOCs gas removal system that can remove volatile organic compound (VOCs) emissions from petrochemical facilities, metal painting factories, and surroundings of life, and can efficiently cope with situations occurring in the field. Regular repairs to petrochemical plants and semiconductor plants are carried out for a month every four to five years, and work such as replacing old pipes and repairing aging facilities, cleaning, removing residual gas, checking pipe connections and valves, and improving processes are carried out while the plant is shut down. During regular maintenance, a large-scale accident occurs in which gas remaining in the facility leaks or explodes due to rising pressure, and even after internal gas discharge and purge work is performed, it is scattered by the characteristics of raw materials remaining inside the pipe and reactor and discharged into the atmosphere. Therefore, there is always a possibility of causing safety accidents, and such accidents have a great socioeconomic impact as they are directly connected to the safety of workers as well as the safety of local residents. This system is designed to be adaptable according to the size of a number of outlets, and it is proposed to minimize the impact of VOCs harmful gases on the surroundings by developing it as a mobile type. The efficiency of collecting scattered VOCs gas is more than 90%, and the integrated operating system is demonstrated for 50 CMM class movable VOCs adsorption device, 5 CMM class treatment gas recirculation type non-flame waste heat recovery adsorbent regeneration treatment device, and two or more business sites.
Assessing Adsorption and Desorption Performance in the Recovery of Volatile Organic
Compounds
Authors: Jeon Dong-Hwan , Park Hoon-Min , Jung Hyun-Min , Yoon Dal-Hwan
Published: October 2024

In this study, the activated carbon fiber filter design and VOC adsorption and desorption performance were evaluated based on the development of a filter regeneration device to treat VOCs in high efficiency and low cost. Activated carbon fiber (ACF) has the advantage of fast adsorption speed and high adsorption capacity because micropores are formed on the surface and a large specific surface area. However, the specific gravity is about 25 times lower than that of activated carbon (AC), so the amount of adsorbent that can fill the same volume is small. In order to solve this problem, the regeneration device is implemented by repeating adsorption and regeneration for a short time, and a cylindrical adsorption filter made of activated carbon fiber is designed according to the operating conditions of the regeneration device. At this time, the pollutant gas and regenerated air are uniformly distributed over the entire adsorbent, and the flow characteristics according to the supply of the pollutant gas and the regeneration gas are analyzed. When the size of the lower part of the cylindrical adsorption filter is smaller than the size of the upper part under the condition that the pollutant gas flows downward, a uniform distribution of the pollutant gas is possible. In addition, as the space velocity decreases, the adsorption capacity decreases, and the differential pressure increases rapidly. Through the regeneration experiment, it was confirmed that the desorption concentration of MEK was higher and the desorption concentration was higher. In addition, the regenerated air is uniformly dispersed throughout the adsorption filter, toluene, o-xylene, and methyl ethyl ketone, which are representative substances of volatile organic compounds (VOCs), are injected with 400 ppm, and then regenerated air is supplied at 150 °C to analyze adsorption characteristics and regeneration concentrations. As a result of the experiment, the adsorption capacity ratio to 1 g of regeneration air according to the type of VOCs was 0.48, 0.36, and 0.25 g in the order of o-xylene, toluene, and methyl ethyl ketone. In addition, as the space velocity decreases, the adsorption capacity decreases, and the differential pressure increases rapidly. Through the regeneration experiment, it was confirmed that the desorption concentration of MEK was higher and the desorption concentration of o-xylene was discharged at a relatively low concentration. Moreover, even if the adsorption concentration changes, there was no difference in the regeneration concentration change. Therefore, the filter was designed based on the spatial speed of the regeneration device of 51,000 -h or less, and the adsorption capacity ratio to 1 g of the regeneration air amount was 0.1 g, thereby enhancing the filter's recycling performance and VOCs emission effect.
Understanding the Drivers of Adoption for Blockchain-enabled Intelligent Transportation Systems
Authors: Anbari Mahsa , Talebzadeh Hossein , Talebzadeh Mohammad , Fattahiamin Amirmohammad , Haghighatjoo Mehdi , Jafari Amirhossein Moghaddas
Published: October 2024

This study tended to present a model for examining the effective factors on adoption of blockchain-based intelligent transportation systems (ITS). The methodology employed was correlational descriptive approach using structural equation modeling. The research involved collecting data through a survey, which was completed by 368 individuals residing in prominent cities across Iran. The findings of the study suggest that perceived quality of digital services significantly impacts perceived ease of use, perceived usefulness, and trust in a positive manner. Additionally, the positive influence of information technology infrastructure and social influence on perceived ease of use and perceived usefulness is evident. Moreover, perceived ease of use and perceived usefulness play pivotal roles in building trust and fostering adoption of blockchain-based ITS. The study also highlights the positive and significant impact of transparent governance on trust and adoption. Furthermore, policies and regulations are identified as key drivers of perceived usefulness and adoption of such systems. Lastly, perceived trust and security are found to positively influence adoption. These findings underscore the potential of the examined variables to serve as robust predictors for the adoption of blockchain-based ITS by citizens.
Increasing the speed of digital devices using the ASMD-FSMD method using non-blocking operators
Authors: Solov’ev V. V. , Klimovicz A. S.
Published: October 2024

The ASMD-FSMD method for designing digital devices is considered, which consists of constructing a block diagram of an algorithmic state machine with a data path (ASMD), which describes the behavior of the device, and creating project code in Verilog in the form of a finite state machine with a data processing path. (finite state machine with datapath – FSMD). One of the directions for the development of the ASMD-FSMD methodology is the use of features of the hardware description language (HDL). A hypothesis has been put forward: in the ASMD-FSMD technique, it is possible to apply several non-blocking assignment operators to the same variable in one synchronization cycle, which will lead to an increase in device performance. The hypothesis put forward was investigated in the design of synchronous multipliers that implement the classical multiplication algorithms c and d. Experimental studies have confirmed the validity of the put forward hypothesis, while the speed of the multipliers increases two to three times, and the cost of implementation in most cases decreases compared to the traditional approach.