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This study aimed to assess the cropping capacity, quality indicators, and phenolic compounds in various tissues of the ‘Kefesiya’ grape variety, influenced by cultivation terroir and agricultural practices. Results indicate that bush training methods, trunk height, and green operations significantly affect cropping capacity, quality, and phenolic content. A multi-armed fan training on a medium trunk in the Sudak terroir yielded 1.8 times higher cropping capacity compared to a one-sided Guyot on a high trunk in Alminskiy. Combining topping with defoliation increased sugar content by 15% and reduced titratable acids by 24% in Sudak, while in Alminskiy, sugar content rose by 5% and acids decreased by 9%. However, this combination also led to a decrease in phenolic compounds across both terroirs. Topping and defoliation positively correlated with phenolic compounds, especially catechins. The study highlights that grape quality and phenolic accumulation are influenced not only by soil and climate but also by specific agricultural practices tailored to crown management.

The primary challenge in red wine production is optimizing conditions for the accumulation of phenolic compounds in grape berries, crucial for the wine’s aroma, color, and flavor. With climate change impacting these components, it’s vital to study the transformation of carbohydrate-acid and phenolic complexes as grapes reach ripeness. This study focuses on the ‘Bastardo Magarachskiy’ grape variety and the effects of foliar mineral fertilization (NTP-Sintez LLC, Belarus) during ripening. Our findings show that experimental processing schemes enhance sugar accumulation in the berries by 1-4 g/100 cm3. The total anthocyanin potential ranged from 1187 to 1684 mg/dm3, with maximum extraction efficiency (61-65%) occurring at sugar concentrations of 21-23 g/100 cm3. Higher sugar levels led to reduced extraction efficiency. The phenolic profile was dominated by flavan-3-ols and anthocyanins, comprising 82.7% to 96.3% of total phenolics. Throughout ripening, there was a significant increase in the mass concentration of primary phenolic compounds in the berries, highlighting the importance of monitoring these changes for optimal wine production.

Nowadays, the formation of intelligent transportation systems is taking place, allowing to increase the efficiency of transportation through the use of innovative technologies. Methods and means of simulation modeling have gained considerable popularity among them, allowing to increase the accuracy of forecasting and efficiency of management decisionmaking. The purpose of this article is to develop the directions of application of simulation modeling in the field of passenger transport infrastructure management. The article presents the results of applied research using simulation modeling tools of passenger transport infrastructure objects. Based on these results, the effects of using simulation modeling methods in the management of passenger transport system are systematized. In order to achieve the research goal, a review of scientific works was conducted, the areas of application of simulation modeling in the management of passenger transport infrastructure were specified, the effects of using simulation modeling methods and tools were analyzed and generalized. The results of the research can be useful to transport organizations, state regulation bodies on transport and organizers of transportation. They can be used in the construction of scenarios for the development of transport infrastructure objects to improve the quality of service to the population and to ensure the effectiveness of management decisions on transport.

Due to global warming, there is a problem to correlate technical and phenolic ripeness in modern viticulture. This study is focused on the use of foliar fertilizers in order to combine the time of beginning of phenolic and technical ripeness. The studies were carried out in 2022 in the conditions of mountain-valley coastal viticulture zone of the Republic of Crimea. Foliar top dressing was carried out with the preparation ‘Agrogemo’ (LLC Pontis, Russian Federation) on wine grape varieties ‘Bastardo Magarachskiy’ and ‘Malbec’. The Glories method was used to estimate the ripeness degree of grapes. The principle of it is to determine the total and extractable anthocyanin potential of grapes. Using of foliar fertilizers made it possible to increase the yield of ‘Bastardo Magarachskiy’ variety by 15.3%, and ‘Malbec’ variety by 18.1%. It was found that the experimental treatment scheme contributed to the later beginning of technical ripeness of grapes, i.e. a low percentage of non-extractable anthocyanins from grape skin compared to the control. Base wines obtained from grapes with the use of organic-mineral fertilizer were characterized by the intense color, balanced aroma and flavor.

This article is devoted to the implementation of a steganographic software tool for hiding infor-mation in MPEG video files. The method of least significant bits was used to hide the data, and error-correcting coding with binary cyclic codes was used to increase the stability of the embedded data. In addition to hiding data, the AES-128 cipher algorithm is applied to the initial data in the algorithm. A software tool has been developed, designed according to the described scheme, which guarantees the im-possibility of detecting and reading the transmitted data by third parties, provided that they do not have access to private data.

Research background: Swedish economist S.B. Linder considered time as the rarest resource, for the preservation of which people are willing to pay more and more. The problem of monetized evaluation of the benefits of reducing travel time has been relevant for the transport economy since the 1960s. The article is devoted to the study of the specifics of the time resource in modern socioeconomic systems and the analysis of approaches for assessing the benefits of changing time costs. Purpose of the article: To make a retrospective analysis of the phenomenon of time in economics, to investigate the evolution of methodological approaches to the assessment of time resources, to uncover contradictions between the fundamental ideas about the distribution of time resources and methods for assessing the benefits of changes in time costs. Methods: The methods of systematic, retrospective and comparative analysis are used in the paper. Findings & Value added: The conclusions obtained in the course of the study allow us to expand and concretize the methodology of economic assessment of transport projects. There are identified and systematized factors that determine the need for differentiated accounting of changes in the value of reducing travel time for passengers, which ultimately determines the demand for transport services.

In this work the effect of post-harvesting aerosol spraying with calcium-containing preparations Master Green Ca (1.75 g/l) and Brentax KCa (2.5 g/l) on changes in the indicators of commercial quality and natural weight loss of grape cv. Shokoladniy in the dynamics of long-term storage was studied. The studies were carried out in 2019-2020. Experimental samples were collected on the 30th and 60th day of storage. It has been established that aerosol spraying contributed to a decrease in the natural loss of bunch weight by 5.7- 6.5%. The amount of total sugars in experimental samples decreased to the 60th day of storage by 15.3% and 10.2% compared to the control. The preparations positively impacted organoleptic indicators during the storage: the tasting assessment of experimental batches of grapes to the end of storage exceeded the control by 6.7-10.3%.

An increase in ambient temperature affects the quality of wines, which is largely due to a change in the metabolism of phenolic substances in grapes. A possible solution to the problem is the use of autochthonous varieties adapted to unfavorable conditions. The influence of agroecological conditions of 4 vineyards on the phenolic complex of the Crimean grape variety ‘Kokur Belyi’ has been studied. Methods of geoinformation and mathematical modeling, HPLC were used. It is established: vineyards differ in heat resources in the row: Vilino < Privetnoe < Solnechnaya Dolina < Morskoe. An increase in the heat supply of territories caused the accumulation of phenolic acids, flavonols, (+)-D-catechine and procyanidins B4 in grape seeds and a decrease in the content of phenolic acids, (-)-epicatechine, procyanidins B3 in skin and pulp. The highest content of procyanidins in seeds and the lowest content of monomeric phenolic components in skin and pulp was determined in grapes from the village of Morskoye. Grapes from Vilino contain 3.7 times less procyanidins in the seeds, 6.5 and 3.6 times more monomeric components in the skin and pulp. Conclusion: the heat supply of vineyards contributes to both the biosynthesis of monomeric phenolic components and their polymerization during the ripening of grapes, leads to a significant differentiation of the phenolic complex of grapes ‘Kokur Belyi’.

This work presents characteristics of qualitative and quantitative composition of phenolic compounds and their changes during long-term storage of ‘Italia’ table grapevine cultivar. The studies were carried out using method of HPLC on a Shimadzu LC 20 Prominence chromatograph with diode-array detector of ultraviolet and visible range. Grapes were sampled fresh and after long-term storage (60 days). Three groups of phenolic compounds were identified: hydroxycinnamic acids, procyanidins, and flavonols. It is established that major components of phenolic complex of ‘Italia’ grapes are procyanidins, specifically d-catechin and epicatechin, amounting 33% and 34%, respectively, and also procyanidin B2 with high proportion of 19%. At the end of long-term storage, a decrease in the mass concentration of phenolic compounds was revealed, the content of hydroxycinnamic acids decreased by 62,3%, procyanidins by 50,1%, and flavonols by 51,0%. A decrease in the activity of polyphenoloxidase enzyme to 60th day of storage by 8,53%, relative to the control, was established. In the process of analysis of variance, statistically significant differences in the components of phenolic profile in grapes of ‘Italia’ cultivar between the beginning and end of storage were established using Student's t-test, which varied from 4,43*10-15 to 6,07*10-7, being so significantly less than 0,05.

We consider the dynamic properties of a system of three differential equations known as the oreganator model. This model depends on four external parameters and describes one of the periodic Belousov–Zhabotinsky reactions. We obtain broad conditions for the parameters that ensure the existence of nonstationary steady-state regimes in oregonator model. With classical values of the parameters, the localization of the limit (at a long time) dynamics in the phase space has been improved. In fact, using numerical analysis, we significantly narrow the bounded region of the phase space containing the trajectories of the system. An iterative procedure is proposed for the approximate localization of closed trajectories (cycles) of the system on algebraic surfaces in R3. A promising problem of theoretical substantiation of the numerical convergence of this procedure is posed.

This research unveils the nature of relations among such phenomena as "ethnos", "culture" and "language". Vested with the function of axiological retranslation, mottoes of the U.S. Armed Forces services and branches make essential part of the military lingo as a semi-autonomous existential form of the national language. Clichéd formulas of the professional sublanguage official register explicitly reflect collective mindset, dominant values, behavioral patterns, and conceptosphere of America’s society military cluster. The authors arrive at the conclusion that military mottoes are typical of vocativity, brevity, metaphoricity, widespread use of Latinisms, stereotypogenicity, and appeal for professional ethos.

The article presents the results of studies on the use of calcium-based bioactivators in aerosol spraying of V. vinifera L cv. Red Globe in the postharvest period and the assessment of its impact on the quality of grapes during storage (30 and 90 days). In the international practice calcium-containing preparations are widely used to solve problems of quality preservation of the resulting crops. Level of calcium in fruits and berries affects the duration of storage by increasing the resistance to pathogens. Calcium-containing preparations are safe for human health and can become good alternative to synthetic fungicides and SO2 when storing and improving the quality of table grapes. In the work we used calcium-based bioactivators Brentax Ca in concentrations of 50 and 75g per 20l of water; Brentax KCa - in concentration of working mixture - 50g / 20l and Master Green Ca in concentration of 35g / 20l. The following parameters were evaluated: mass concentration of dry matter and titratable acids, weight loss of bunch and organoleptic parameters.High efficiency was performed by preparations Master Green Ca and Brentax Ca 50. Their use made it possible to reduce significantly the weight loss of bunch towards the end of storage by 45 and 34% compared to the control, to preserve organoleptic parameters (7.8 and 7.6 points), respectively, at the level of fresh grapes during storage owing to safekeeping of stem in a flexible condition, preservation of natural color, turgor of berries and balanced flavor. The data obtained will allow improve the system of long-term storage of grapes due to the use of calcium-based bioactivators Master Green Ca and Brentax Ca in concentration 50g / 20l of water.

The article reviews the history of establishing Moscow University and the first decade of its performance in the context of considering the European experience and the role of visiting foreign professors. Attention is drawn to the use of the experience of European universities in the projected management system of Moscow University and ensuring its autonomy by M.V. Lomonosov. The authors show the role of the I.I. Shuvalov, the favorite of Empress Elizabeth Petrovna, in implementation of the project of Moscow University, and analyze the developed hierarchy of the university’s governing bodies, the structure of administrative positions, and the system of privileges granted by the government. The dominant role of visiting professors in establishing and functioning of the university’s faculties is revealed in detail, as well as the conditions created for their work in Moscow, and the personal role of each of the invited professors in the educational process during the first years of Moscow University. The authors reveal the conflicts between Russian and foreign professors and show their inevitability at the stage of establishing Moscow University, drawing attention to the transition of the educational process to the Russian language as the teaching language during the first years of the reign of Catherine the Great, Empress of Russia.

Determination of frictional condition of the running surface and side surface of the top of rail (lubrication) that ensures the best interaction of the rolling stock wheels and the rail, reduces the force action and thus ensures the track stability and reduced side wear of rails in the curved tracks is relevant for all the rail net.The objective of research is to determine the influence of frictional condition of the track rail surfaces on the interaction forces in the “wheel/rail” contact with various motion parameters (speed, radius).The theoretical and experimental methods were used in the research. The theoretical methods include multioptional computer modelling of axial and lateral forces that appear in the curved tracks during the freight train movement in the software package “Universal Mechanism”. The modelling results were processed with the use of correlation and regression analysis. The experimental methods include full-scale measurements in the existing track and results processing.According to the research results, the theoretical algorithms for assessment of influence of the running surface lubrication on the forces. The option of frictional condition of the wheel and rail interaction surfaces has been established to ensure reduction in the operating expenses for surfacing and rail replacement, energy costs for haulage of freight train.

The article attempts to present a holistic view of the theory, practice and history of the development of public education in the modern Volga Federal District in the chronological framework of the second half of 19-20th centuries. In order to achieve the presented goal of the research, we used theoretical methods (analysis, synthesis, generalization, modeling, abstraction, classification, systematization, periodization) and historical and pedagogical methods of research, namely, comparison and contrast (comparativist), historical and structural and historical and typological. Within the geographical framework of the Volga Federal District as a complex sociocultural region with the cohabitation and interaction of different nationalities and confessions, the history of education in a holistic form has not been considered before. The authors proposed modern scientific and pedagogical methodological approaches to the analysis of the history of education of the region represented: pedagogical axiology, pedagogical regionalism, pedagogical comparativism, pedagogical synergetic, systemic-activity approaches. For the first time, the theory and practice of public education in the modern Volga Federal District are considered in the context of a unified historical and pedagogical process (without the traditional division into pre-revolutionary and Soviet stages). In addition to theoretical results of the historical and pedagogical research and practical: the formation of a bank of archival materials on the history of education in the republics and regions of the Volga Federal District; publication of the textbook “History of Public Education in the Volga Federal District”; publications in peer-reviewed journals devoted to the study of educational development in the Volga Federal District; organization and conduct of the Pedagogical Festival of Student Science of the Volga Federal District republics; as well as the preparation and production of a series of television programs about the history of the development of public education in the republics and regions of the Volga Federal District.

The article draws attention to the sphere of historical and pedagogical knowledge. Being a product of the development of human society, it lies at the core of contemporary and future pedagogical culture. The mature conventional wisdom helps people to forge their own path in the modern world, to determine their self-identification and the prospects for their personal growth. The historical heritage of the first half of the 20th century, rich in invariant ideas, scientific and pedagogical experience, is viewed here by means of its inclusion in the construction of all spheres of life in modern Russia and Kazakhstan, including the development of pedagogy and psychology. The article reveals the stages of scientific activity of the outstanding teacher and psychologist A.P. Nechaev, characterizing the main milestones and dynamics of the formation of domestic experimental pedagogy at the beginning of the 20th century. It highlights the scholar’s ideas about syndromic psychology, holistic, mental and moral development of the personality, which are relevant even today. The research is based on conceptual ideas of dialogical pedagogy, problem-personalistic approach, retrospective, comparative historical and historical-phenomenological methods. Experimental pedagogy as a phenomenon of the early 20th century ceased to exist without quite exhausting its capabilities, but it laid the foundation for and determined the strategic development direction of child psychology, pedagogical psychology, genetic psychology, childhood ethnography, differential psychology and differential psychophysiology, and the experiment became a sturdy part of the scholarly apparatus of pedagogy and psychology. The potential of experimental pedagogy made it possible to pose and solve large-scale issues of creating a new school, scientific and pedagogical centers, finding solutions to a wide range of psychological and pedagogical problems, designing research schools that develop natural science, psychological and pedagogical problems of education and upbringing. The invariant ideas of this direction of moral, mental and intellectual development of students are also relevant at the beginning of the 21st century and can be used in the practice of contemporary school education.

One of the main factors increasing the productivity of vineyards and the quality of fresh grapes during storage is the use of vegetative treatments with bioregulators of various physiological effects. This work is devoted to the study and comparative assessment of various foliar treatments with the growth regulator "Albit", "Glycerol" and a complex of fertilizers LLC "Biochefarm Rus" on agro biological and commercial quality characteristics of the table grape variety ‘Moldova’ during the longterm storage. Foliar treatments were carried out in the main phases of the growing season: 'before flowering', 'after flowering', 'the beginning of growth', 'the beginning of ripening'. Sampling for analyzes was carried out for 30, 90 and 150 days of storage. It was found that foliar treatment leading to a significant increase in cropping capacity of grapes by 26.8% ("Biochefarm"), 36.5% ("Albit") and 20.0% ("Glycerol"). The increase in the average weight of the bunch in the experimental variants grew by 29.6-31.3%. The use of experimental schemes of foliar treatments made it possible to increase the keeping quality of table grapes: the weight loss of bunch decreased by 0.3-3.5%. The tasting assessment of the experimental batches of grapes at the end of storage exceeded the control by 5.6-6.9%.

The study object - technological process of interference fits assembling is identified, the scheme with oil supply from the end face is adopted as the technological scheme. Technological pressing equipment is considered, its applicability for hydropress assembling is evaluated. The main aspects of hydropress joints assembling on a base of mechatronic press are established: increasing of assembling performance, its stability. Mathematical models and an algorithm that regulate the process of liquid friction and formation of an oil layer between the contacting surfaces of joint mating parts are developed. The basic requirements for the regulation channels of control system that ensure the quality of hydropress fits during automated assembling are established.

In the transition to automated and automatic manufacturing an urgent problem is to increase the reliability of mobile robots (MR) and their drives, creation of devices to monitor the technical characteristics of MR, diagnose and predict the remaining resource. Inspite of the high relevance of the diagnosing MR drives problem, there are no generally accepted methodology for diagnosing MR drives, criteria for selecting methods, parameters and volumes of diagnostics at present. An unsolved problem, related to the diagnosis of MR drives and the prediction of their residual life remains, is the development of methods that allow to carry out of automatic complex multiparametric diagnostics and prediction of the residual life using artificial intelligence methods. Effective fault detection and diagnosis can improve the reliability of the MR drive and avoid costly maintenance. In this paper a fault detection scheme for synchronous motors with permanent magnets based on a fuzzy system is proposed. The sequence current components (positive and negative sequence currents) are used as fault indicators and are set as input to the fuzzy fault detector. The expediency of the proposed scheme for determining of various types of faults for a synchronous motor with permanent magnets under various operating conditions is simulated using the SimInTech software.

Research background: The problem of evaluating the results of innovative transport technologies is extremely important for their implementation and realization. The assessment of possible benefits of innovative transport projects is complicated by a number of circumstances. These include a wide range of arising effects in various forms and the long life cycle of the project, which increases the difficulty of reliably measuring the various costs and results. Thus, it can be argued that outdated approaches and methods for assessing the new transport products hinder the development of innovations. Purpose of the article: to identify directions for assessing the travel time value in the analysis of the transportation projects economic efficiency. Methods: The study was conducted by means of scientific methods such as the comparative analysis, system method, generalization and abstraction. Also, we use the results of expert assessments based on depth-in interviews. Findings & Value added: The article substantiates the necessity of taking into account the incremental benefits for passengers from travel time reduction as the most important aspect of transport projects implementation, ensuring the formation of the whole range of external social and economic effects; The multi-factor dependence of the travel time value for a passenger, which is characterised by its heterogeneity during a journey, has been substantiated. The necessity of assessing changes of travel time values in the general transport costs of passengers has been substantiated, taking into account the several factors that lead to different time values. A visual model of the socio-economic effects formation of the HSR project, caused by changes in the passengers’ total transport costs and increased transport accessibility of the region, is proposed.

An ATOVS and MERRA data archive containing temperature values at isobaric levels from 1000 to 50 hPa was formed to study the atmospheric effects observed over the foci of two strong earthquakes with magnitudes M = 7,3. The first seismic event was recorded on August 19, 1992 in the northern Tien Shan and the second on November 12, 2017 in the border areas of the Zagros folded mountain belt. According to USGS intense aftershock activity in these regions began with these seismic events. Using correlation and spectral analysis we studied the vertical profiles of temperature and pressure in a disturbed atmosphere over seismically active regions. The modified anomaly index was calculated at isobaric levels from 500 to 50 hPa and on its basis the registered temperature anomalies were investigated.

Digitalization and automation in all sectors of the economy have increased the efficiency and effectiveness of various systems and processes. Online technologies are also widely used in the higher education system. Online learning, e-learning, e-learning tools and digital assessments are not innovations in the full sense of the word, but the widespread use of these technologies took place in mid-2020, due to the COVID-19 pandemic. The using the online format of training by universities and schools in the spring of 2020 was mostly spontaneous and forced, but later, due to the complication of the sanitary and epidemiological situation in the world, as well as in order to improve electronic pedagogical technologies in the field of certification of university students, this technology became the subject of consideration by specialists from different industries and, above all, from the field of pedagogy. The authors made attempts to study the main problems of University students passing exams and tests in an online format in order to avoid them in the future, and also developed ways to improve this technology.

Satellite data on total ozone content for 1985-2015 have been used. Methods of evaluating ozone deficit in the polar region and its excess in middle latitudes of the Southern Hemisphere have been developed. In early spring the ozone molecules outflow and the ozone anomaly forms. Ozone inflows the middle latitudes, its total content increases and a ring with elevated TO forms. In October-November the dynamic process reverses, from the ring the ozone molecules transfer to the polar latitudes. The amount of ozone leaving the ring into the polar regions and filling the ozone anomaly is virtually the same. The results produces indicate that the Antarctic ozone hole is a natural geophysical formation.

Hospitality provides wide opportunities for entrepreneurship. Feasibility and forecasting of results have always been relevant for implementation of entrepreneurial ideas. Aim of the study is to clarify specifics of forecasting of specialized tour operators’ activities. Forecasting methods in tourism, as a rule, are based on opinion polls and extrapolation techniques. Difficulties with forecasting of results are related to indefinite part of specialized tours in overall volume of tours. And for every specialized tour this part depends from character and number of factors, which define demand for tourist product. Result of the study is the proposed algorithm for finding of planned sales of specialized tours for ensuring of profitable activities. With the example of gastronomical tours, which have good perspectives in Ukraine, it is proved that planning of more than 25-30% of specialized tours in overall sales of tours is not feasible. Finding of this research can be applied to product development, as well as marketing and strategic planning.

At the beginning of the XX century, bourgeois theorists of artistic culture declared dehumanization as one of the main features of the modernism art, one of the main tasks of the contemporary artists’ artwork. Getting to the scientific understanding of the complex and complicated phenomena of modern art culture, it is necessary to reveal not only the socio-economic reasons for their appearance; the philosophical prerequisites for the development of modern bourgeois art, the ideological orientation of its movements should be identified. In the article, the authors argue that modern bourgeois aesthetics objectively performs the opposite tasks: a) bourgeois art distracts artists and spectators from pressing issues of life, b) imposes ideals and tastes that are advantageous to the bourgeoisie, c) sow pessimism and disbelief in human forces. According to authors, as opposing the personality of society, bourgeois art contributes to the isolation of human from social problems, from issues and tasks of the struggle for a better future. The authors believe that the disclosure of the reactionary ideological essence for the many directions of modern bourgeois art enables a consistent Marxist aesthetic analysis of the content and form of artwork and the principles of bourgeois artists’ creativity. Naturally, the philosophical idealist teachings and aesthetic systems that make up the theoretical foundation of modern bourgeois art, embodied in its various directions not directly but indirectly. Only a Marxist analysis of artistic phenomena and techniques of artistic creation in their correlation with the creative method makes it possible to reveal the true interconnections of these phenomena and the essence of artistic techniques, makes it possible to detect and criticize scientifically based falsification ideas of bourgeois theoreticians of art.

This paper deals with the study of capabilities for strengthening an aluminum alloy with hollow ceramic microspheres. The results of the microstructural analysis and the investigation of strength properties for the aluminum-silicon alloying system are described herein. For comparison Experiments have been carried out for comparison both with classical microspheres and with chromium- and chromium-carbide-coated microspheres to increase the melt adhesion to a microsphere

Nowadays, the state of Zhiguli Hydroelectric Station (HS) and its main hydraulic structures is controlled by observation of control and measuring equipment installed on these structures. There are systematic inspections and surveys carried out by both the hydroelectric power station personnel and by invited experts. The last analysis of the state of HS and its hydraulic structures was made in 1991. Since that time, a computer-based information and diagnostic system for monitoring the state of hydraulic structures has been introduced at HS. This system introduction caused the need to pay more serious attention to the reliability of the results obtained by means of control and measuring equipment, because the system monitored the condition of all hydraulic structures according to these results. Thus, the purpose of the research is to perform a multi-factor analysis of HS state and its hydraulic structures according to field studies results of all the devices installed in water-retaining structures. The results show impervious elements of HS underground circuit are not effective enough for specific geological conditions in terms of clearing the filtration head. The main drop of water head in the base occurs on HS building upper cutoff, i.e. in this zone there is a maximum filtration gradient, which is very dangerous. This process should be carefully monitored. It was revealed that several piezometers in the base do not work or their indications are not reliable, therefore it is necessary to repair and, in some cases, replace them. In future, it is necessary to equip main piezometers of HS with remote water level measuring sets and to make an automated system of condition monitoring.

Abstract. Cavitation erosion affects the hydropower plants operation mode, destroys the surface of water-conducting way, affects the efficiency coefficient as well as the turbine output. The most common damage is observed on water-conducting ways having poor streamline shape, various ledges, irregularities along the water flow. Disruptive cavitations are formed initially on the rotation axes of vortexes, and the caverns of disruptive cavitation develop with the period subordinating the Strouhal Law. One of the methods of cavitational erosion field studies is the method of obtaining high-speed cavitational erosion of metal plates, which has low resistance to cavitation mechanical effects. It provides an opportunity to determine erosion degree and intensity at different modes of hydropower plants operation. The paper demonstrates the results of studying the cavitational erosion process of hydroturbine impeller blades of Zhiguli Hydroelectric Station (HS). Cavitation tests are conducted for three operating modes. Technological peculiarities are also described. The paper presents results of turbine blades of Unit 5 for three operation modes. The destruction areas of impeller blades peripheral edges are visualized. The study provides the results of field and laboratory cavitation tests of hydroturbine elements that serve as recommendations for repairing and restoration of damaged hydroelectric units of Zhiguli HS.

The paper presents the results of investigation of cyclone impact on ionosphere parameters. Ionosphere state was observed by automatic sounding equipment applying low-orbital navigation spacecrafts in the conditions of low seismicity.

The research explores the ways of Kantianism reception in Russian symbolism philosophy. The emphasis is made on the philosophical systems of V.S. Solovyov, A. Bely, V.I. Ivanov and P.A. Florensky as the most holistically reflecting the development of epistemological, aesthetic, and general theoretical tendencies of the symbolist school, whose representatives are united by the similarity of critical positions regarding the teachings of I. Kant, which indicates the homogeneity of symbolist philosophy itself in its relation to transcendental idealism. The Kantian influence is analyzed, firstly, through the symbolist philosophy of culture disclosure and the influence of Marburg school neo-Kantianism on it, secondly, by identifying the foundations of the Silver Age mythocentric metaphysics with its unique ethical paradigm, thirdly, through solving the problem of antinomianism in the theory of cult as a space of religious creativity. Evolution peculiarity of Kantian influence on symbolism is explicated from the absolute acceptance of the criticism concepts of pure reason and the ability of judgment to their complete denial and search for the possibility of resolving antinomianism through the specific mission of social aesthetics. It is argued that with Kant's strong influence on the development of symbolist aesthetics, the symbolists themselves are looking for ways to bridge the gap between the world of noumenons and phenomena in it, noting the special role of theurgic creativity and the concept of catholicity consciousness. This makes it possible to understand the philosophy of symbolism as a counterargument system when posing the problem of the noumenal reality incomprehensibility. It is concluded that the symbolist criticism of Kantianism is generally religious and mystical-intuitionistic in general, justifying the possibility of comprehending the noumenal world as a principle of spiritual doing.

The paper analyzes the efficiency of an air conditioner with additional cooling. The analysis of various designs has shown that there are a number of opportunities to improve their circuit and design solutions, as well as the use of additional reserves that increase the energy efficiency of air conditioners. The paper proposes a method for improving the operation of an air conditioner by introducing additional cooling. Temperature versus time dependences were plotted for various thermal loads on the condenser and evaporator. The data obtained in this work are the results of a study of the use of condensate to reduce the temperature level of the condenser compressor.

The problems of optimal design of shell-and-tube heat exchangers, widely spread in industry, acquire new aspects of relevance due to the rapid development of digital design technologies and computer mathematics systems. The review of works of domestic and foreign researchers in the field of design of shell-and-tube heat exchangers is carried out. The aim of the work is to increase the efficiency of shell-andtube heat exchanger design by applying the methods of optimal design. Materials and methods. The traditional method of calculation of shell-andtube heat exchanger is analyzed, on the basis of which the ways of its modernization are determined A new calculation scheme consisting of three parts is proposed. In the first part, formulas and reference data are used, the calculation and selection of which do not require the use of search procedures. The second part consists of a set of functions describing the design parameters of the heat exchanger, the arguments of which are control parameters. The third part of the method solves the optimization problem of obtaining the extremum of the target parameter under the action of a number of constraints on the structural parameters of the apparatus. To verify the efficiency of calculations, a parametric solid-state model of the heat exchanger is used, with the use of which the thermal-hydraulic calculations were carried out. The results of the research. On a concrete example it is shown that the proposed methodology of optimal design of shell-and-tube heat exchanger allows to obtain a design with minimum total weight of tubes. A number of calculations of the heat exchanger are carried out to illustrate that it is practically impossible to achieve the optimal parameters of the apparatus by methods of “manual counting”. Thermal-hydraulic calculation of the optimal design of the apparatus showed good adequacy of the results obtained by the proposed method and the data of thermal calculation with the help of CAD-system.

Enhancement of technological processes’ efficiency in agriculture can be achieved through the optimization of technological, structural, and performance characteristics of agricultural machinery. Modern machinery should have high productivity rate, ease of operation, high level of standardization and minimal expenditures of energy resources. The paper gives examples of the implementation of flow-dividing valves for the maintenance of the requested level of synchronization in the hydraulic drive of the agricultural equipment using the example of folding cultivator. The improved calculation hydraulic model of the cultivator and scheme of throttling flow-driving valve of non-spool type with plunger setting device are presented. The article gives the numerical scheme of the hydromechanical drive system of the cultivator which gives consideration to the volume coefficient of stiffness. It contributes to the exact accuracy of calculations and analysis.

The paper proposes a method of measuring the distance between mining equipment and workers in complex conditions of underground mine workings considering the influence of absorbing properties of rocks and the presence of turns and obstacles. The method consists in using a magnetic beacon, operating in VLF-LF frequency range, on the body of mining equipment and receivers on the miner's body to register proximity and notify a person about it. Registration of convergence is carried out by RSSI methods. The authors propose a design solution of magnetic beacon and receiver, which includes amplification stages for signal registration at 30-35 meters. The paper also presents the measurement error of the information parameter under the influence of the ground surface and the tunnel.

Increasing the reliability of the hydraulic drive of technological systems of machines is one of the main technical tasks. The article is devoted to a description of the life tests of membrane-type throttle dividers-adders of flows. The paper presents a schematic hydraulic diagram of an experimental stand for life tests of flow dividers-adders and describes the principle of operation of the stand for life tests of flow dividers. A comparison is made of the resources of two throttle flow dividers-adders of the membrane type DSP-01.000 DSP-05.00.000. The features of the test procedure and the loading sequence are described. The article represents a special contribution to the development of new technical solutions in the field of hydraulic drive control and can serve as the basis for further research in this area.

The article is devoted to the study of the use of hydraulic drives in the automotive industry, which is a promising direction in engineering practice. The paper examines the global implementation of hydraulic drives in various vehicle systems, such as steering, braking, suspension and clutch mechanisms. The main attention is paid to the analysis of the advantages and disadvantages of hydraulic drives in the automotive industry. The study includes a conclusion about the operating efficiency of hydraulic drives, their reliability, durability and economic feasibility. The results obtained during the study can be useful in choosing optimal solutions for the use of hydraulic drives. This can help improve the safety and performance of vehicles, as well as improve production processes in the automotive industry. The article represents a special contribution to the development of new technical solutions in the automotive industry and can serve as a basis for further research in this area.

Ensuring the safe operation of complex technical systems is an urgent task. Complex technical systems include lifting, mobile, agricultural machinery, etc. Absolutely every complex system fails during operation. At the same time, failures can have different effects not only on reliability indicators, but also on the degree of safety. The degree of safety of operation of complex equipment is directly influenced by the probability and nature of the occurrence of failures. Thus, in order to increase operational safety, it is necessary to reduce the risk of a negative event, which is defined as the possibility of an adverse event occurring, that is, a combination of the degree of negative consequences with the possibility of its occurrence. The article provides an example of calculating the risk of failure; a method for calculating the parameters of the three-parameter Weibull distribution is proposed; an algorithm for determining three parameters of the Weibull law for a sample is given; the results of parameter calculations are presented; Proposals have been put forward for ways to increase the level of reliability and safety, respectively.

The article provides an analysis of low-frequency and high-frequency methods for determining the distance between mobile equipment and personnel for the purpose of preventing collisions in difficult mine conditions. The authors assessed the influence of the geology of mine workings, the earth’s surface and transport on the electromagnetic field of the VLF, LF and C range. From the analysis, a combined design solution was derived for determining the distance in surface and underground mining conditions. The proposed methods for registering the proximity of objects compensate for each other’s vulnerabilities and make it possible to implement an integrated approach to preventing collisions of mining equipment with personnel.

Relevance and goals. Hydraulic drives of modern mobile machines and technological equipment are, as a rule, branched and multi-circuit. At the same time, there is often a need to ensure synchronous (coordinated) movement of two or more independent hydraulic motors. The analysis of the conducted studies has shown that throttle flow dividers are the most suitable for providing automatic control of hydraulic drives. The use of spool flow dividers in general-purpose hydraulic drives, especially if they work in harsh conditions with high dustiness of the environment is impractical. Materials and methods. The article provides an overview of existing designs of non-spool throttle flow dividers for synchronous hydromechanical drives, their design schemes and operating principle are given. A comparative analysis of the functions performed by them and the quality of work is carried out. Suggestions are given on the principles of selecting a particular design of the flow divider, depending on the operating conditions. Results. A scheme of a test bench for piston hydraulic cylinders with energy recovery is proposed. A mathematical model of the stand has been developed and an example of a preliminary calculation of its functioning is given. Conclusions. The conclusion is made about the design features that make it possible to ensure the synchronous operation of hydraulic drives with high accuracy at minimal cost.

We introduce the three-dimensional Eringen system of equations for the nematodynamics of liquid crystals, announce the short time existence and uniqueness of strong solutions for the one-dimensional problem in the periodic case, and show the continuous dependence of the solution on the initial data.