Specificity of Dynamic Effects in Metals and Alloys under Shock Loading

Теоретически проанализированы эффекты динамического взаимодействия структурных дефектов в условиях ударного нагружения. Получены аналитические выражения вклада различных дефектов в величину динамического предела текучести сплавов.The effects of dynamic interaction of structural defects under shock loading are theoretically analyzed. Analytical expressions for the contribution of various defects to the value of the dynamic yield stress of the alloys are obtained

Modeling of continuous melting of quartz-feldspar raw materials of subsequent flow from the plasma heating

The problem of obtaining easy-flowing melt silicate-containing materials with the use of low-temperature plasma. A mathematical formulation of the evolution of the silicate-containing raw material to the melt. The analysis of the preliminary results

Modelo de desarrollo económico sostenible para las explotaciones agrícolas basado en un gobierno corporativo efectivo

During the last years of the post-crisis period, numerous barriers that have hindered the effective functioning of crisis integrated structures in the agro-industrial complex were especially hard. This situation forces top managers to apply the strategy of their division into highly specialized firms immediately after the consolidation of assets. The result of this situation is that the Russian agro-industrial complex loses the possibility of large-scale involvement of the scientific, technical and organizational potential of integrated structures, which, in theory, should act as the leaders in the modernization processes of the national agrarian economy. The next global economic crisis, weighed down by the sanctions of the United States, the EU and several other countries, exacerbated the problems of technological modernization temporary boundaries for agro-industrial complex, which at that time became a strategically important economy sector due to a significant decline of GDP in 2014-2015 and worsened the socio-economic situation of the Russian Federation in the international division of labor. All previous years, the approaches to the development of integrated structures were not of a systemic nature, were not always an effective result of random searches and the development of tools to increase their macroeconomic performance. This situation could not but veil the importance of large integrated formations in the implementation of agricultural sector modernization goals in the national economy.Durante los últimos años del período posterior a la crisis, numerosas barreras que han obstaculizado el funcionamiento efectivo de las estructuras integradas de crisis en el complejo agroindustrial fueron especialmente difíciles. Esta situación obliga a los altos directivos a aplicar la estrategia de su división en empresas altamente especializadas inmediatamente después de la consolidación de los activos. El resultado de esta situación es que el complejo agroindustrial ruso pierde la posibilidad de una participación a gran escala del potencial científico, técnico y organizativo de las estructuras integradas, que, en teoría, deben actuar como líderes en los procesos de modernización de la economía agraria nacional. La siguiente crisis económica mundial, agobiada por las sanciones de Estados Unidos, la UE y varios otros países, exacerbó los problemas de modernización tecnológica de los límites temporales del complejo agroindustrial, que en ese momento se convirtió en un sector económico estratégicamente importante debido a un disminución significativa del PIB en 2014-2015 y empeoró la situación socioeconómica de la Federación de Rusia en la división internacional del trabajo. Todos los años anteriores, los enfoques para el desarrollo de estructuras integradas no fueron de naturaleza sistémica, no siempre fueron un resultado efectivo de búsquedas aleatorias y el desarrollo de herramientas para aumentar su desempeño macroeconómico. Esta situación no podía sino la importancia de las grandes formaciones integradas en la implementación de los objetivos de modernización del sector agrícola en la economía nacional

INELASTIC PROCESSES IN HIGH-STRAIN RATE DEFORMATION OF METALS AND ALLOYS

The high.strain rate deformation of aged alloys is theoretically investigated. An analytical expression for the contribution of various structural defects to the dynamic yield strength is obtained.Теоретически исследована высокоскоростная пластическая деформация состаренных сплавов. Получено аналитическое выражение вклада различных структурных дефектов в величину динамического предела текучести

Polymethine Dye as Sensors of NH 3

We have investigated the properties of polymethine dyes (PMD) and the purpose of using them as sensors of hazardous gases presence. Research indicates that in case of utilizing PMD as a sensor of hazardous gases we need to use the monochromatic light which wavelength corresponds to the inflection point of the long-wave absorption edge of PMD. Such sensor of hazardous gases can detect changes in the optical density of the sensor layer or the light intensity transmitted through the layer

DEVELOPMENT OF A GROUP OF MOBILE ROBOTS FOR CONDUCTING COMPREHENSIVE RESEARCH OF DANGEROUS WAVE CHARACTERISTICS IN COASTAL ZONES

New methods and approaches for carrying out comprehensive measurements of hazardous waves (tsunami, storm surges) and background wave climate with telemetrically related group of ground, surface and underwater based robots are discussed. The design and equipment list of the ground robot are considered. It includes three various types of movers, an add-on for the installation of devices on the mobile platform and the hardware part. Ground robot was tested in 2016 on the coast of Sakhalin Island, cape Svobodny. Based on test results there were made conclusions on the possibility of increasing mobility of the ground robot and expanding its use. Specially designed underwater robot collects data using a video inspection system and a hydrostatic wave recorder with a string sensor. It has the ability to adjust the position of the center of gravity to increase stability when driving on steep slopes of the seabed. The surface robot was designed for conducting detailed bathymetry measurements of investigated water areas by means of a multi-beam echo sounder. Underwater and surface-based robots were tested in July 2017 on Sakhalin Island. Both robotic systems were merged into the united local network. The results of their operation were obtained to verify the data from measuring systems of the ground robot. In 2018, it is planned to conduct a series of tests involving the three robots and merging them into a local network to manage and process data in real-time

Возможности прогнозирования осложнений при малоинвазивной декомпрессии желчных путей

Introduction. Obstructive jaundice is one of the most relevant problems in abdominal surgery. The prediction of complications and deaths when using minimally invasive technologies of biliary tract decompression on the basis of objective and reliable criteria will allow this disease to be treated under optimal conditions.Materials and methods. The study was based on the clinical observations and studies of 219 patients with obstructive jaundice, who underwent minimally invasive biliary tract decompression by retrograde and antegrade stenting as the first stage of treatment. Using Statistica 10.0 and MedCalc 12.7.0. software, a retrospective analysis of case histories in 2 groups of patients with and without complications was performed.Results and discussion. The patients were divided into 2 groups: group I — 51 (22.8%) with complications and fatal outcomes in 11 cases, group II — 168 (77%) patients without complications. In group I, external drainage was performed in 23 (45%) patients, and endoscopic stenting in 28 (55%) patients. In group II, external drainage was performed in 73 (43.5%) patients, and endoscopic stenting in 95 (56.5%) patients. Using multivariate ROC analysis, 14 interacting predictors of complications and deaths were identified for minimally invasive interventions of the biliary tract with a significant correlation during the first stage of endoscopic stenting (p < 0.0001). A formula was derived for calculating the prognostic coefficient, for which the values and coordinates of the ROC curve were all values above -1.5635 with a sensitivity of 80.4 and a specificity of 77.4. A software product was created for the formation of risk groups in terms of complications and deaths among patients undergoing minimally invasive biliary tract decompression interventions.Conclusion. Multivariate statistical ROC analysis allows prediction of complications during minimally invasive interventions for biliary tract decompression in 80% of cases. The selection criteria are the location of the tumour, the duration of jaundice and the deviation of the main biochemical parameters from the norm.Введение. Проблема механической желтухи является одной из наиболее актуальных в абдоминальной хирургии. Прогнозирование развития осложнений и летальных исходов при применении малоинвазивных технологий декомпрессии желчных путей на основе разработки объективных и достоверных критериев позволит осуществлять лечение в оптимальных условиях.Материалы и методы. Основу работы составили клинические наблюдения и исследования у 219 больных с механической желтухой, которым первым этапом лечения осуществлялась малоинвазивная декомпрессия желчных путей ретроградным и антеградным способами. С помощью программ Statistica 10.0 и MedCalc 12.7.0. проведен ретроспективный анализ историй болезни в 2 группах больных с осложнениями и без них.Результаты и обсуждение. Пациенты были разделены на 2 группы: I группа — с осложнениями 51 (22,8 %), из них летальные исходы в 11 случаях, II группа — без осложнений 168 (77 %) больных. В I группе наружное дренирование проведено у 23 (45 %), эндоскопическое стентирование — у 28 (55 %) пациентов. Во II группе наружное дренирование проведено у 73 (43,5 %), эндоскопическое стентирование — у 95 (56,5 %) больных. С использованием многофакторного ROC-анализа выделено 14 взаимодействующих предикторов осложнений и летальных исходов при малоинвазивных вмешательствах на желчевыводящих путях, имеющих значимую корреляционную связь, при проведении первым этапом эндоскопического стентирования (р < 0,0001). Выведена формула по подсчету прогностического коэффициента, у которого критерием ценности и координаты ROC-кривой являются все значения выше -1,5635 с чувствительностью 80,4 и специфичностью 77,4. Создана компьютерная программа формирования групп риска осложнений и летальных исходов при применении малоинвазивных методов декомпрессии желчных путей.Заключение. Многофакторный статистический ROC-анализ позволяет прогнозировать развитие осложнений при выполнении малоинвазивных методов декомпрессии желчных путей в 80 % случаев. Критериями выбора являются локализация опухоли, длительность желтухи и степень отклонения от нормы основных биохимических показателей

Empirical Evaluation of Educational Service Quality in the Current Higher Education System

During the transition to the mixed education model during the Covid-19 pandemic, some issues have emerged in the matter of providing and supporting the quality of university education in all countries, including educational programs' relevance to the demands of the labor market, expectations of students and their families, digital transformation of the educational process, and economic stability of institution networks. The purpose of the research was to evaluate the quality of educational services in the higher education systems of Indonesia and Russia. The study systematized several essential factors for achieving educational service quality in the current higher education systems, given the limitations imposed by Covid-19. Following this objective, the study utilized a quantitative approach, adopting the SERVQUALmodel that measures the service quality across five service dimensions: tangibility, reliability, responsiveness, assurance, and empathy. The model aided the development of the questionnaire to assess the quality of the educational services of Indonesian and Russian universities. The questionnaire included 25 close-ended questions on two scales: one to measure the students' expectations regarding the quality of educational services and the other to measure the students' current perceptions. A snowball technique was used to recruit students from Indonesian and Russian universities as participants in the study. The students were asked to assess the educational services of their universities based on their initial expectations and current perceptions. Overall, the students of both countries revealed that they had high expectations from the educational services of their universities. However, the current perceptions of the Russian students regarding the quality of educational services provided by their universities are higher and more positive than the perceptions of the Indonesian students regarding the quality of educational services being delivered to them. The findings of the study have implications for education practitioners. Doi: 10.28991/ESJ-2022-SIED-05 Full Text: PD

Increasing the Effectiveness of Pedagogical Technologies in Education: Psychological Experience of Technological Change Management

This paper investigates the psychology of change management involving a technological change in the educational organization and the administrative and teaching staff. In particular, the paper delineates the staff’s psychological experience regarding the incorporation of pedagogical and educational technologies. In this regard, this article provides theoretical support based on the stimulus-organism-response theory, technological self-efficacy, and technological acceptance model and develops a theoretical model. A quantitative approach was applied to test the model, and research assumptions were drawn from the aforementioned theories. Particularly, disruptive statistics and correlation analysis were employed to test the assumption empirically by collecting data from 500 staff members. The research results highlight that a psychological response serves as the antecedent of the effectiveness of pedagogical and educational technologies, whereby the positive psychological responses (happiness, inspiration, or drive) would increase the effectiveness, while the negative psychological responses (anxiety, stress, and discomfort) would decrease it. This psychological response depends on the perceived self-efficacy and perceived ease of use of the staff, whose lower levels of the two raise the negative psychological response. Generally, to increase the effectiveness of pedagogical and educational technologies, it is essential to effectively manage the psychological well-being of the staff by reducing their negative psychological responses and developing their technological competence (self-efficacy and ability to use with ease). Doi: 10.28991/ESJ-2023-SIED2-05 Full Text: PD