bluuebunny/crossref_metadata_2025_split huggingface dataset:
Silicone elastomers deformation peculiarities under compression
Authors: Minaev A Y , Valiev H H , Andronic A A , Astakhov K N , Stepanov G V 
Published: December 2022

Abstract
This paper deals with the polymer composite material unique properties on self-restoration after ultimate compressive loads application. Material is based on polydimethylsiloxane elastomeric matrix with carbonyl iron particles isotropic fillers in concentration 75% wt. This composite mechanical characteristic ranges were studied in comparison with the characteristics of conventional polymer based on silicone elastomer without the fillers. The investigated material, the so-called magneto-elastic, demonstrated ability to self-restore its shape after extreme loads removal is a promising direction for the revealed unique property use and will probably be demanded for application in number fields of science and technology. The tests were carried out on an electromechanical testing machine. These materials investigating various compression modes results summarized as: the strain diagrams changes at different load ranges were plotted, the characteristics changes in their deformation properties were analyzed, the compression deformation linear and nonlinear characteristics limits were determined. The proposed compression method in various modes made it possible to determine the load changes ranges causing both irreversible changes in the conventional polymer based on silicone elastomer and its further destruction and the unique capability for self-recovery in a composite material, the so-called magneto-elastic, after similar types ultimate loads application to it.
Comparative analysis of thermal characteristics of higher fullerenes when heated in a nitrogen atmosphere
Authors: Barbin N M , Yakupova L V , Terent’ev D I , Kuanyshev V T 
Published: December 2022

Abstract
To study the behavior of higher fullerenes Cn (n = 84, 90, 94) under thermal exposure in a nitrogen medium, a thermodynamic modeling method is used, the main task of which is to determine the phase, chemical composition and parameters of the system under study. This method consists of analyzing the system using the TERRA program, which is a further development of the ASTRA program package. For Cn-N2 systems, a comparative study of ongoing chemical reactions was carried out. Intervals of thermal stability of the condensed phase for higher fullerenes are revealed. The periods of thermal destruction in the gas phase in the systems under consideration are determined.
Two-sided estimation of linear approximation error second - order hypersurfaces
Authors: Akhmedov Yunus , Asadov Shuhrat , Azimov Bobir 
Published: December 2022

Abstract
The following aspects of multidimensional space are considered in the article. The parametrizations of the hypersurface of the second order are considered, which allow visualizing them in the process of discretization. The development of the principle of vector modeling for displaying objects of multidimensional space on a two-dimensional plane made it possible to visually display the solution to the problem of linear approximation of a second-order hypersurface. The proposed method for discretizing a second-order hypersurface makes it possible to create a simple algorithm for its linear ash-approximation, which is the basis for solving the linear programming problem in automatic mode. The developed method of two-sided estimation of the error in the case of linear approximation of the second-order hypersurface allows us to present the problem of determining the bearing capacity of structures as a linear programming problem.
Testing of crystalline silicon-based photoelectric and photothermal batteries in real climate conditions and comparison of parameter changes
Authors: Muminov R A , Tursunov M N , Sabirov Kh , Abilfayziyev Sh N , Yuldoshov B A , Toshpulatov S F 
Published: December 2022

Abstract
The article examines the changes in electrical parameters of three types of photovoltaic batteries (PV) and photothermal batteries (PVT) based on them, installed on a portable device with the increased intensity of solar radiation using reflective planes. In this case, without changing the position of the PV and PVT in the device, like the “network” stations, it was set so that the solar radiation falls vertically, as in the time of the rising of the sun, directed to the south. This natural experiment served two purposes. The first is to determine the optimal type for the climate when the various types of PVs available in the local commercial market are used in hot climates. Second, the results of determining and comparing the changes in parameters and energy efficiency of PV and PVT with the same base and capacity at the same time under the same conditions are presented. From the results of the experimental tests, it was clear that the best indicators in terms of short-circuit current, open circuit voltage and power in hot climates are monocrystalline PV and its base PVT. Among the PVs, the lowest values were observed in front and black back coating photoelectric battery. Among the PVTs, it was observed in the polycrystalline silicon photothermal battery. When all types of PVTs were cooled by passing water with a temperature of 18-20°C, sharp electrical changes were observed in monocrystalline silicon with a black back coating. The conclusion from the results of this change is that the use of black back coating photoelectric battery in cold climate regions leads to higher efficiency. Compared to conventional PV, PVT has been observed to generate 1.3-1.4 times more electricity depending on the type of material.
Strength calculation of the frame of chisel plow
Authors: Bibutov Narzullo 
Published: December 2022

Abstract
The article covers materials for calculating the strength of the frame of chisel plow. The developed design of experimental chisel plow for a 4t class tractor is designed for loosening the soil in the cotton-growing zone without turning the layer to a depth of 50 cm and is mounted on the frame of the ditcher-leveler KZU-0.3B. However, the KZU-0.3 B frame cannot withstand such a load, because of what it is deformed. Therefore, a new design of the frame of the chisel plow GRH-2-50 has been developed.
Geoinformation support for studies of the boundaries of flood zones in urban areas
Authors: Lisetskii F N , Poletaev A O , Buryak Zh A 
Published: December 2022

Abstract
The article presents the results of the use of geoinformation modelling of the processes of urbanised territories’ flooding by river waters. Physical, geographical, and climatic parameters of the key river basin (Vezelka River within the boundaries of the city of Belgorod) have been determined. A list of input data and methods that were used to create geoinformation models is presented. The peculiarities of the technique of aerial photography and the creation of a digital terrain model on its basis are disclosed. The formulas for the calculation of the level of water rise and calculation of the flooding model corrected by the terrain are disclosed. The results of determining high levels of river water by calculated sites are shown, longitudinal and transverse profiles with estimated water levels during flooding with different levels of the expected probability of occurrence have been created. The final map of the boundaries of flood zones in the urban area, which are calculated using geoinformation modelling, is demonstrated. We propose that the results of geoinformation modelling of flooding scenarios for large rivers be included in the regional GIS portal.
Prospects for applying FD-SOI technology to space applications
Authors: Lagaev Dmitriy A , Klyuchnikov Aleksey S , Shelepin Nikolay A 
Published: December 2022

Abstract
In this work, using numerical simulation, the reasons for the occurrence of increased values of leakage currents in NMOS fully depleted SOI (FD-SOI) transistors during interaction with ionizing radiation. It has shown that the main reason for the formation of leakage currents is the charge accumulated in the latent oxide upon interaction with ionizing radiation. The effectiveness of applying a bias on the substrate and the formation of a well under the buried oxide (BOX) to reduce the leakage currents is investigated. Based on the obtained results, it was concluded that it is promising to use transistors made using FD-SOI technology for space applications.
New efficiencies of energy-saving facade paints based on a combined film-forming agent
Authors: Gadoeva Olmahon , Fatiloev Sardorbek , Fayzullaeva Zarina , Yaxshiyev Yoqub 
Published: December 2022

Abstract
This article discusses new nano-technological building materials for facade backgrounds and energy-saving efficiencies in the construction of new buildings. Recently, a lot of new materials and their economic efficiency for modern construction have been developed in construction. In nano technologies applying facade paints and semi-thermal energy-saving paints for the utilization of the house and efficiency in new housing and this is very relevant in new construction, and this has grown a lot of development is underway based on a combined film-forming agent from local materials
Mathematical model of heat transfer of a solar chamber carrying out solar thermal treatment of precast reinforced concrete
Authors: Usmonov Farhod 
Published: December 2022

Abstract
A mathematical model of heliocamera heat exchange has been developed, designed for heat treatment of precast concrete and reinforced concrete products, which allows to determine the preferred design solutions from the standpoint of effective heating and increase the strength of concrete in them. The mathematical model allows us to estimate the efficiency of the heliocamera in different climatic zones and at different times of the year, as well as to calculate the temperature regime of the heliocamera under the conditions of the varying intensity of solar radiation and the outdoor air temperature during the day.
Evaluation of the technical parameters of the generator for efficient electricity generation in low-speed wind and water flows
Authors: Sadullaev N N , Nematov Sh N , Sayliev F O 
Published: December 2022

Abstract
This article analyzes the literature on the choice of generators for power devices that can work effectively with wind and water currents in the climatic conditions of Uzbekistan. In most of the territory of our republic, low-speed winds and water currents prevail. Efficient use of these flows makes it possible to save fuel and energy resources and thereby reduce the emission of CO2 gas into the atmosphere. Based on the analysis of the literature, the factors of using an electric generator capable of operating efficiently even at low rotation speeds are analyzed. The article deals with scientific research carried out in recent years on generators with radial and axial magnetic flux
To simulating the functioning of workplace for the verification of measuring instruments
Authors: Ershov D S , Malahov A V , Levina T A , Khayrullin R Z 
Published: December 2022

Abstract
The article presents the mathematical model and the results of simulation the dynamics of functioning of the workplace for the verification of measuring instruments as a non-stationary service system with the priority of servicing incoming requests. An estimate of the complexity of the application of the developed model is given.
Waste water treatment from oil products by precipitation
Authors: Bykovsky N A , Puchkova L N , Fanakova N N 
Published: December 2022

Abstract
At a number of enterprises, there is a problem of wastewater treatment from oil products. It was studied the oil products composition in the wastewater in industrial sewage system of a machine-building plant. Gravimetric method was used to determine the concentration of oil products in wastewater. When detecting oil products in concentrations exceeding the MPC, it was researched the wastewater treatment from petroleum products by precipitation. It was also calculated the granulometric composition of oil products in wastewater and the main design parameters of the settling tank.
Analysis of methods disposal and processing of oil sludge
Authors: Kovaleva M A , Vinichenko T N , Slashchinin D G , Luneva T A , Matkerimov T Y 
Published: December 2022

Abstract
The article is devoted to the analysis of methods of utilization and processing of oil sludge. The advantages and disadvantages of thermal, biological, chemical, physical and combined methods of disposal are considered in detail. It is concluded that it is necessary to use an integrated approach to obtain a more effective result and involve oil-containing waste in recycling in order to minimize the anthropogenic impact on the environment. The analysis of one of the promising technologies for processing oil sludge at large fields planned for implementation - the production of fuel briquettes for use in boiler houses operating at the field. It is proved that from the point of view of technical and environmental indicators it is not effective. It is proposed to consider the problem of oil sludge management from the perspective of three components: reducing the volume of oil sludge and preventing its formation as a whole, the use of effective methods of recycling, recycling through an integrated approach.
The relevance of the use of low-volume rotary disk mixers
Authors: Laponov S V , Ivanov S P , Erushonkov A N 
Published: December 2022

Abstract
In the presented work, a description of the principle of operation of a rotary-disk mixer is given. The author notes that in industry the designs of a rotary-disk mixer with smooth disks having additional elements rigidly fixed in the form of blades or teeth of various shapes are most widely used in industry. The description of 4 developed constructions of working disks with structural differences is given. An experimental proof of the effectiveness of the use of additional working bodies is given. It is noted that the latter lead to the emergence of new highly turbulent flows of the processed medium, which has a positive effect on the processes of emulsification and dispersion. It is shown that with an increase in the proportion of the dispersed phase in a stirred medium, the average size of the droplets of the dispersed phase increases. This is explained by an increase in the concentration of the dispersed phase and the frequency of collisions of droplets of dispersed particles, which lead to coalescence. It has been established that the size of the particles of the dispersed phase decreases inversely with the rotor speed and the increase in the dissipation energy.
Circuit modeling of measuring units of a bioimpedance analyzer
Authors: Antipenko V V , Pecherskaya E A , Levin A I , Golubkov P E , Antonov I V 
Published: December 2022

Abstract
In today’s world, medical professionals pay more and more attention to the development of diagnostic devices for patients. Developers are faced with the task of creating biomedical devices that have the conditions of non-invasiveness, as well as satisfying in terms of accessibility and technical and economic parameters. One of the non-invasive methods that requires special attention is bioimpedance. The bioimpedance analyzer finds wide application in various fields. However, it should be noted that there are problems of measurement accuracy, selectivity of measurements of the object under study, etc. There are a large number of analyzers, but all of them have basic scientific and technical problems associated with measurement error. In this paper, a block diagram is proposed, which has a distinctive feature from other bioimpedance measurement structures - it is the use of an independent current source and a differential amplifier, which will allow working with an object that has a high resistance between current and potential electrodes. The aim of the study is to model the measuring units of a bioimpedance analyzer. The main task of which is to develop a current source model capable of measuring at a high frequency up to 2 MHz.
Development of a bioimpedance instrument and investigation of the interaction of electrodes with a bioobject during bioimpedance diagnosis
Authors: Antipenko V V , Pecherskaya E A , Levin A I , Golubkov P E , Antonov I V 
Published: December 2022

Abstract
In diagnostic medicine, in order to monitor physiological parameters that characterize the composition of the human body, the state of the respiratory system, in oncology and other areas, one of the informative parameters is bioimpedance. At the moment, when measuring bioimpedance parameters, much attention is paid to the methods and measurement accuracy. The biological object in contact with the electrodes under the influence of alternating current demonstrates a complex behavior of the impedance. In this article, from the metrological point of view, the contact electrode - biological object is analyzed; ways to reduce methodological errors due to the influence of electrodes are proposed, a model of a bioimpedance instrument is proposed.
Development of selective gas sensors using nanomaterials obtained by sol-gel process
Authors: Eshkabilova M , Abdurakhmanov I E , Muradova Z , Abdurakhmanov E , Abdurakhmanova Z 
Published: December 2022

Abstract
Developed technology for producing gas-sensitive thin films based on oxides of zinc, titanium and tungsten using the sol-gel process. The relationship of the sol-gel technology of forming semiconductor gas-sensitive films based on TEOS and metal oxides of Zn, Ti, W. the influence of various factors on the properties of the solution on the basis of TEOS with or without dopants were studied. It is established that taking into account the stability of the solution and solubility of the components of the hydrolyzate in the solvent during the synthesis of gas-sensitive films based on oxides of Zn, Ti and W it is advantageous to use ethanol.
Semiclassical theory of electronic states in multilayer semiconductors. Part 1
Authors: Rasulov V R , Rasulov R Ya , Mamatova M A , Qosimov F 
Published: December 2022

Abstract
States of electrons in multilayer semiconductor structures are theoretically investigated in the semiclassical approximation, where one-electron wave functions of the stationary Schrödinger equation are calculated in the presence of various types of potential, which is a slowly varying function of the coordinate. It is determined that the energy spectrum of electrons in the potential in the quadratic approximation takes discrete values and the steepness of the energy spectrum depends on the parameters of the expansion of the potential in coordinates.
Model of fuzzy inference for energy efficiency evaluation at industrial enterprises
Authors: Biryulin Vladimir , Kudelina Daria , Pykhtin Alexey , Borodin Alexey , Bulgakov Alexey , Holschemacher Klaus 
Published: December 2022

Abstract
At the moment, with the developing industrialization of society, as well as the growing demand and consumption of all types of end products, industry is increasing the use of energy resources to create capacities corresponding to the current time. The main industrial source of energy in the 21st century is electricity. In industries and enterprises, electricity is used in large amount, and that is why the main and urgent task to reduce the cost, increase the competitive ability of the organization and the growth of its microeconomics is the ability to reduce electricity consumption, and not by reducing production lines, but due to the correct and modern technology of its use. To solve this problem, many factors, which are expressed in quantitative and qualitative data, should be taken into consideration. But it is complicated by the fact that most often these data groups have incompleteness and uncertainty of the used information. This may be due to outdated equipment, lack of necessary technological equipment, or simply a human factor. In this regard, there is a not objective and not quite correct model and assessment of electricity usage by the enterprise. To get out of this situation with the benefit of industry, it is possible to use the mathematical apparatus of fuzzy logic. The results obtained using this method can be considered objective. Based on reasonable estimates of the impact of various factors on energy consumption and energy efficiency of the enterprise system, it is possible to develop methods for its improvement, increasing energy efficiency, reducing waste, which leads to an increase in the competitiveness of the enterprise by reducing the cost of the final product and reducing the cost for the consumer.
Unknown equations in the elerctromagnetic fields
Authors: Smol’yakov Eduard R 
Published: December 2022

Abstract
With the help of the extremal theory of dimensions, a close relationship between gravity and electromagnetism was proved and unknown differential equations were found in parallel and consecutive electrical circuits. This became possible due to the use of higher derivatives (in the equations of motion), engendering hitherto unknown forces, which actually affect on dynamics and are far from small, but have not been known until now. This fact was most clearly manifested in a mechanical structure called Tolchin’s inertioid, which moves with high acceleration due to internal rotations and does not obey to the known laws of mechanics. Its movement turns out to be quite understandable only from the standpoint of the higher derivatives of its movement. A similar phenomenon takes place also in the electrical circuits and it is demonstrated in relation of problems in which the differential equations are sought by means of the extremal theory of dimensions. In this work, by means of the “extremal theory of dimensions”, we prove the close connection between gravitation and electromagnetism and also we find the generalization of the known differential equations of the electrical engineering.
The estimate one-two-sided confidence intervals for mean of spectral reflectance of the vegetation
Authors: Kerimkhulle S , Kerimkulov Z , Aitkozha Z , Saliyeva A , Taberkhan R , Adalbek A 
Published: December 2022

Abstract
This paper studies the problem on the estimate one-two-sided confidence intervals for mean of spectral reflectance of the vegetation. For this, the theory and methodology of mathematical statistics, algorithms and technologies of remote sensing, and a wide review of modern scientific literature are involved. As a result, for mean of spectral reflectance of the vegetation was estimated left-right-two-sided confidence intervals under realistic, optimistic, and pessimistic scenarios. And left-right-two-sided inequalities are given for mean of spectral reflectance of the vegetation.
Probabilistic assessment of water quality by total hardness using gamma distribution
Authors: Yalaletdinova A V , Malkova M A , Enikeeva L V , Kantor E A 
Published: December 2022

Abstract
The nature of the total water hardness distribution in the river has been studied. It was found that during the year, changes in the total hardness largely depend on the seasonal factor, therefore, an analysis of the indicator distribution separately for each month was also made. Empirical distribution functions of the total hardness were found from the built-in variational series. It was found that the obtained distribution laws of the water total hardness differ from the normal and lognormal distributions, but are described quite accurately by the gamma distribution. The put forward hypotheses about the laws of distributions were tested by Kolmogorov’s goodness-of-fit test and confirmed. The distribution functions of the water total hardness describe the probabilities of occurrence of events in which the indicator will exceed or not exceed the specified values.