bluuebunny/crossref_metadata_2025_split huggingface dataset:
A mathematical model of an inductively coupled radio-frequency discharge at low pressure as nonlinear partial eigenproblem
Authors: Yu Shemakhin A , Zheltukhin V S , Yu Shemakhin E , Samsonova E S , Terentev T N 
Published: December 2022

Abstract
A new approach for modeling steady state inductively coupled radio frequency discharges at low pressure is described. A simple one-dimensional model is considered, which includes Maxwell’s equations and the electron balance equation with boundary conditions of the third kind. It is shown that the system of boundary value problems is a two-parameter partial eigenvalue problem. The smallest eigenvalue of the problem is the boundary value of the magnetic field strength. The second parameter of the problem is the concentration of electrons at the center of the plasma bunch. The developed approach makes it possible to calculate the inductor current required to maintain a steady state of the discharge. The results of calculations of the dependence of the inductor current, electron density, electric and magnetic fields on pressure are presented.
Photoelectric properties of solar cells based on pCdTe-nCdS and pCdTe-nCdSe heterostructures
Authors: Otajonov S M , Ergashev R N , Axmedov T , Usmonov Ya , Karimov B 
Published: December 2022

Abstract
In this paper, we study the photoelectric properties of pCdTe-nCdS and pCdTe-nCdSe-based film heterostructures. It is shown that the high value of the electron diffusion length in pCdTe slick (pellicle) is due to the presence of a built-in field in it. The shift in the photosensitivity maximum is explained by changes in the band gap of cadmium telluride. As shown, the accumulation coefficient increases with raising thickness of the wide-gap layer. It has been established that the short-wavelength edge of the photosensitivity of the pCdTe-nCdS structure begins to increase sharply at a photon energy of hv ≤ 2,3 eV, while the photosensitivity of the pCdTe-nCdSe structure already at a photon energy has a significant value ∼ 100 μA/mV.
Technologies for the development of high-viscosity oil fields
Authors: Varisova Raushanya R 
Published: December 2022

Abstract
With the depletion of light oil reserves, the share of current reserves of viscous and high-viscosity oil will increase, therefore, the search for effective methods for the development of deposits of high-viscosity oil is a natural direction for the development of the oil industry. Currently, thermal methods of exposure are widely used in the development of deposits of high-viscosity oil. Despite the fairly good efficiency of this method, thermal exposure technologies are characterized by high energy intensity, which in some cases can significantly reduce the economic attractiveness of the method. This issue is particularly acute in the context of a decline in world oil prices.
The algorithm for the detection of information signals
Authors: Chernoyarov Oleg , Dachian Serguei , Glushkov Alexey , San Kaung Myat , Litvinenko Vladimir 
Published: December 2022

Abstract
The problem of detecting signals in the presence of interference arises in various areas of radio engineering and is solved by using the selected indicators of the signal presence that are compared with a specified threshold. In this paper, an algorithm for detecting a discrete signal is proposed, with the decision threshold that determines the false alarm probability and does not depend on the noise level, while the missing probability depends only on the signal-to-noise ratio. The decision is made according to the number of exceedings of the threshold level by the modulus of the logarithm of the ratio of the amplitudes of the received and previous symbols in a sampling of a given size. For the false alarm and missing probabilities, the theoretical expressions are obtained. Statistical simulation of the detector for the case of a phase shift keyed signal is carried out. It is proven that the number of false alarms is not influenced by the noise parameters while the introduced detector provides high noise immunity and efficiency.
Modeling of laser reflow of a powder heat-protective coating on a carbon composite
Authors: Alisin V V , Roshchin M N 
Published: December 2022

Abstract
The article discusses the issues of creating a heat-shielding coating to protect carbon composites from oxidation and ablation in high-temperature gas flows. The prospects of creating a framework structure containing a refractory zirconium dioxide powder in a metal matrix are substantiated. Particular attention is paid to the distribution of heat fluxes in the process of laser melting of the coating. The temperature in the coating is calculated as the melt front propagates, which opens up the possibility of optimizing the parameters of the coating laser processing technology. The developed technology is promising for the protection of carbon composites in the conditions of their use in the flow path of turbine engines.
OES diagnostics of NF3/Xe plasma for deep structures in LiNbO3
Authors: Osipov Artem A , Gagaeva Alina E , Speshilova Anastasiya B , Osipov Armenak A , Alexandrov Sergey E 
Published: December 2022

Abstract
In this work, in situ non-perturbing method of optical emission spectroscopy is used to examine the features of the emission spectra of NF3/Xe plasma, which can be used for the process of continuous plasma-chemical etching of lithium niobate. To understand the physicochemical processes occurring in plasma, the influence of high-frequency power, pressure in the chamber, bias voltage and substrate temperature on the emission intensities of the F, N, Xe lines was studied. It was determined that increasing the bias voltage from -300 to -50 V and the temperature from 50 to 300°C doesn’t change the relative intensities of the analysed spectral lines, while increasing the high-frequency power from 500 to 750W and decreasing the pressure from 1.95 to 0.95Pa increase the intensities of the F, N, Xe lines.
Study of a linter machine with steel gaskets in production
Authors: Mukhammadiev D M , Ibragimov F Kh , Abzoirov O Kh 
Published: December 2022

Abstract
The article presents the results of the study of a linter machine with steel gaskets in an industrial environment. An analysis of the structures of aluminum saw gaskets was conducted, and their main shortcomings were established. To eliminate the shortcomings of aluminum gaskets, technical solutions were proposed. For this purpose, a new design of saw gaskets with steel pads for cotton gins was proposed. Steel gaskets for linter machines were made. The dimensions of the saw cylinder with steel gaskets after assembly are determined. The main energy indices of the saw cylinder electric motor were determined. The current in the electric motor of the saw cylinder was 41.6 A. In addition, an increase in the productivity of the linter machine with steel gaskets by 50 kg/h was established due to the precise assembly of the saw cylinder. The results of studying a linter machine with steel gaskets in production showed the possibility of using a steel saw gasket when assembling the saw cylinders of a linter machine.
Intelligent technologies in the development of cyber-physical production systems
Authors: Vershinina L P 
Published: December 2022

Abstract
The tasks, the solution of which plays the most significant role in the development of cyber-physical production systems, are identified. The influence of the features of the production of high-tech products on the choice of ways to solve these problems is shown. An approach to solving problems of monitoring, measurement, modeling and technological process control based on one of the directions of artificial intelligence - the theory of fuzzy sets and fuzzy logic is considered. Intelligent technologies for measuring and modeling technological process parameters are described. The model allows to predict the quality of the manufactured product based on the current state of the process, to solve questions about the expediency of adjusting operations, to choose adequate management. As a result, the efficiency of the cyber-physical production system is provided in changing conditions.
Application of radiophotonics methods and devices in multifrequency microwave remote sensing radiometric systems
Authors: Rostokin I N , Fedoseeva E V , Rostokina E A , Shchukin G G 
Published: December 2022

Abstract
The article considers the possibility of using methods and devices of radio-photonics in the composition of microwave radiometric systems for remote sensing of the atmosphere in order to significantly improve the basic tactical and technical characteristics of microwave radio-measuring equipment. The analysis of possible options for the use of radio photonics devices as part of multi-frequency microwave radiometric systems is carried out. The results of the structural study of a promising microwave radiometric system for remote sensing of the atmosphere are presented.
Analysis of heat and mass transfer process while cooling particle boards produced on low-toxic resins
Authors: Ischenko T L , Efimova T V 
Published: December 2022

Abstract
Particle board production technology is a complex process including a number of important operations, and the quality indicators of the finished product largely depend on it. One of such operations is cooling of hot plates after pressing. Increasingly, low-toxic resins are used in particle board production. However, the modes of post-press exposure of particle board on resins with low formaldehyde content should differ from the well-known ones. Therefore, the purpose of this work was to develop a mathematical model (a system of equations), that will theoretically calculate the duration of plate cooling, as well as display the temperature on its surface and over the cross section for any time interval. As a result of the work carried out, a mathematical model has been proposed that enables theoretical calculation of cooling duration of particle board produced on low-toxic resins and to display the temperature on its surface and over the cross section at any time interval.
Vacuum-arc technology and equipment for cleaning and surface treatment of metal products operating under load
Authors: Moldahmetova A E , Vasil’ev I M , Kochetkov A N , Sabitov L S , Zagidullin R R , Kiyamov I K 
Published: December 2022

Abstract
The material of the product should be considered as an integral concept that combines the substance, the technology of its production, design, technology of its manufacture and processing. The durability of products depends not only on the properties of the material, determined by the manufacturing technology and volumetric hardening, but also to a large extent on the properties of the surface. Its role in ensuring the performance properties of products is constantly increasing, which, along with the widespread use of traditional methods of chemical-thermal treatment, has contributed to the emergence and development of a new direction - surface engineering by methods of energy and physico-chemical effects. The high rate of high-frequency heating (hundreds of degrees per second) causes a shift in phase transformations to higher temperatures. Therefore, the high-frequency quenching temperature should be higher than the quenching temperature of ordinary furnace heating, and the higher the higher the heating rate. The current density across the section of the part is uneven, on the surface it is much higher than in the core. The main amount of heat is released in a thin surface layer. The depth of current penetration into the metal depends on the properties of the heated metal and is inversely proportional to the square root of the current frequency. The higher the current frequency, the thinner the resulting hardened layer. A reliable method of hardening the surface layer can give comparable results only if the quality of the surface is stable, including its cleaning. The surface condition of the part (tool) depends not only on the structure of the base material and all the conditions for its manufacture, but especially on the last operation of its production or processing. Research is being conducted, among other things, within the framework of the AP14869891 project “Increasing the operational life of heavy-loaded railway transport parts using innovative plasma technology”.
The problem of electromagnetic wave transmission in a circular waveguide
Authors: Alexandrova I L , Osipov E A 
Published: December 2022

Abstract
The article deals with the problem of transmission in a circular waveguide, in the cross section of which there is a thin metal screen. The waveguide is bounded by a perfectly conducting surface. The transmission problem is an auxiliary problem that arose when solving inverse diffraction problems. In the transmission problem, it is required to find the electromagnetic field in the waveguide on one side of the screen by a given field on the other side of the screen: both by given waves incident on the screen and by given waves leaving the screen to infinity. It is shown how the transmission problem can be reduced to an infinite system of linear algebraic equations. To solve the resulting system, it is proposed to use the truncation method. We study under what conditions the numerical solution of the transmission problem will be stable to small perturbations of the input data.
Measurement technique for increasing the allowable dimensions of antennas tested in a collimator installation
Authors: Choni Yu I , Abuhadma L K T 
Published: December 2022

Abstract
Large collimator setups are often in use for antenna radiation pattern measurements. Their quiet zone size limiting the allowable dimensions of the antenna under test, as a rule, do not exceed a half of the collimator’s profile. Retrieving ARP from measurements in a non-ideal environment can be a means to expand the working area. The subject of the article is such a technique based on of the representation of a real field by a converging cluster of plane waves. It turned out that at the stage of studying the field of the collimator, despite the requirements of the uniqueness theorem, measurements may be carry out on a certain limited area of the boundary surface. Acceptable results are obtained when the working area is up to 90% of the collimator cross section.
Effect of temperature on the current-voltage characteristics of PdFe/Cu and NiCo/Cu bimetallic catalysts in alkaline alcohol electrolytes
Authors: Tarantseva Klara , Korosteleva Anna , Tarantsev Konstantin , Krasnaya Elena 
Published: December 2022

Abstract
The temperature rise effect on the electrochemical activity of catalysts on a copper substrate in alkaline alcohol solutions has been studied. The object of research was bimetallic PdFe/Cu and NiCo/Cu catalysts obtained by galvanic deposition on a copper substrate. The studies were carried out in immiscible liquids EtOH + K2HPO4 + H2O. The upper phase in this system of liquids is aqueous solutions of ethanol (“alcohol layer”), the lower phase is aqueous solutions of dipotassium phosphate K2HPO4 (“salt layer”). It was found that elevate temperature from 20°C to 60°C improve the activity of all catalysts. It was found that the Ni80Co20/Cu catalyst is highly active in the oxidation and reduction of oxygen. The peak of the oxidation current increases 4 times with elevate the temperature up to 40 C, and 14 times with elevate temperature up to 60 C, compared with currents at a temperature of 20 C. The Pd90Fe10/Cu catalyst is active in relation to the oxidation of ethanol. Elevate the electrolyte temperature from 20°C to 40°C increase in the oxidation current by a factor of 1.4, and from 20°C to 60°C by a factor of 3.3. The maximum cathode current at the peak of recovery exceeds the maximum anode current at the peak of oxidation at 40°C by 1.83 times, and at 60°C by 1.15. This indicates a good regeneration of the electrode surface and the absence of oxide films and ethanol oxidation products on its surface. It was concluded that, despite the ambiguous effect of temperature on the processes occurring in the system, the improvement in the characteristics of the studied catalysts can be explained by the improvement in the processes of ethanol oxidation and improved mass transfer of the reagents.
Outflow of a supersonic gas jet into a liquid
Authors: Yakovchuk M S , Volkov K N , Emelyanov V N 
Published: December 2022

Abstract
Numerical modeling of the underwater outflow of a supersonic gas jet in a three-dimensional non-stationary formulation is carried out using an eddy-resolving approach based on a combination of RANS-LES turbulence modeling methods. The calculation of the interaction of a gaseous medium with a liquid is carried out using the VOF multi-phase model, the forces of surface tension and the compressibility of the liquid are taken into account. As a result of calculations, an unsteady pattern of the formation of a supersonic jet and a gas cavity in a liquid is obtained, the shock-wave structure of the flow is visualized, and pressure fluctuations in the liquid are estimated. The results of calculations are compared with the data of experimental high-speed photography.
Experimental research of the low-temperature drying process of tomato
Authors: Rasulov Shukhrat , Djuraev Khayrullo , Abidov Kamildjan , Usmanov Akhtam , Fayziev Amirulla 
Published: December 2022

Abstract
The scientific research presents the results of studies aimed at studying the patterns of tomato drying, the change in moisture released per unit time over the entire surface of the raw material and the change in temperature in the product layers, as well as the dependence of the mass of the product per unit surface on the drying speed. Wavelength ranges with a high level of liquid absorption during tomato drying were experimentally determined. It has been established that the acceleration of the movement of liquid drops in a capillary-porous structure in the direction from the inner layer to the surface is carried out by creating the appropriate temperature and pressure in the inner layer of the product. The isotherms of desorption and sorption of tomato raw materials during the drying process are given.
Study of heating kinetics and temperature fields of melon fruits under IR irradiation
Authors: Khaitov R.A. 
Published: December 2022

Abstract
This article is devoted to the study of heating kinetics, temperature fields, as well as determining the laws of non-stationary heat transfer processes during treatment of melon fruits with IR rays. These studies, in turn, make it possible to determine the heating time to the desired temperature under different radiation conditions, which is a necessary condition for achieving a positive effect of heat treatment in infrared radiation. At the same time, the study of temperature fields and heating kinetics is carried out in order to reach the optimal regime obtained in the treatment of melon fruits with IR rays as a result of planning the experiment. The optimization of the process shows that the most appropriate mode of heat treatment of melon fruits during drying is IR irradiation at an incident flux density of 23-24 kW/m2 in a pulsed mode: τ=95 (-40)+60 (-30)+60 sec. The analysis of heating kinetics and temperature field confirms the correct selection of the optimal modes obtained in controlling the process of treatment of melon fruits with IR rays and allows to establish the laws of heat-mass transfer.
Using the Monte Carlo method to determine the volume of excavation work
Authors: Tsvetkov V Ya , Oznamets V V 
Published: December 2022

Abstract
The article describes a method for calculating the volume of spatial models when performing earthworks. It is based on the Monte Carlo method. The solution of the problem is based on the use of photogrammetric survey and the construction on this basis of a digital model of the surface and a three-dimensional digital model of the result of excavation work. Additionally, a reference three-dimensional object is introduced, covering the volume of excavation work. The dimensions and volume of the reference object are known. A random number sensor with a uniform distribution is used. The method is based on comparing relations of discrete sets and continuous sets. The concept of discrete volume is introduced. Based on comparative estimates of discrete volumes and continuous volumes, the volume of a three-dimensional object is calculated using the known volume of the standard. The method excludes geometric volume calculations for complex configurations of walls and the bottom of a three-dimensional object. The article contains an assessment of the applicability of the method and an estimate of calculation errors.
Study of the efficiency of gas purification systems for metallurgical productions
Authors: Zolkin A L , Kolesnikov A S , Bityutskiy A S , Saradzheva O V , Stepina I V 
Published: December 2022

Abstract
One of the main tools used to study the technological processes of waste gases purification from metallurgical production is physical simulation. The problems of large-scale transitions that arise in the course of such a study can be circumvented by conducting experiments on industrial and (or) semi-industrial units. The article presents possible options for reduction of emissions of chlorine-containing components, taking into account the chemistry of the reactions occurring throughout the entire operational cycle of neutralization.
Determination of wear of the rotary-disk mixer according to the emulsion analysis data
Authors: Laponov S V , Erushonkov A N 
Published: December 2022

Abstract
There is in the presented paper shown a classification of rotary-disc mixers by various constructive and technological features. Also it is shown that mixers with fixed additional elements on discs are mostly widespread. A wear of additional work elements leads to decrease of efficiency of mixing and quality of the final product. The use of the photometric method of analysis of an emulsion allows to determine main parameters of the emulsion quickly and with sufficient accuracy. Having compared get results with the base results we can determine a degree of wear of working elements of the device.
Semiclassical theory of electronic states in multilayer semiconductors. Part 2
Authors: Rasulov V R , Rasulov R Ya , Mamatova M A , Qosimov F 
Published: December 2022

Abstract
The electronic states in multilayer semiconductors are studied theoretically in the semiclassical approximation. In this case, the Schrödenger equation is solved, where the potential is expanded into a series along the coordinate and is limited by the first four terms. It is shown that, in this case, the energy spectrum takes on discrete values, and the bending of the energy spectrum increases as the size quantization order increases.
Application of polycrotonaldehyde, obtained from recycling the waste “yellow oil”, in production of lubricants
Authors: Tilloev L , Dustov Kh , Turakhujaev S 
Published: December 2022

Abstract
The impact of polycrotonaldehyde, extracted from the waste “Yellow oil” produced during the alkaline treatment of pyrogas at Shortan gas chemical complex, on its properties lubricants as a dispersed medium and a dispersed phase after it is added to them have been studied in this paper. It has been established that polycrotonaldehyde can be used as a dispersed phase in the production of lubricants. Based on the research results, it has been proven that the addition of 2.5% to 7.5% of polycrotonaldehyde in the production of lubricants gives a positive result. The lubricant prepared by adding 5% of polycrotonaldehyde as a dispersed phase had a penetration number of 271 and a dropping temperature of 119 °C.