bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of the structure of gas dynamics of the flow in the vicinity of the central body, at different heights
Authors: Kaun Yu V , Brykov N A , Mikhailov M V
Published: December 2022

The problem of jet flow through the critical section of a nozzle with a central wedge-shaped body with subsequent interaction of the jet with the wall of the central body and the flow of co-current atmospheric air is considered. The structure of the gas-dynamic flow in the vicinity of the central body of the nozzle channel at the control points of the altitude range of the flight of the aircraft is investigated.
Physical modeling of the passive induced polarization method for the possibility of estimating the depth of the ore body simulator
Authors: Belolipetskii P V , Shajdurov G Y , Potylitsyn V S , Krasnov T V , Kokhonkova E A , Maykov O A
Published: December 2022

The article presents physical modeling data for the passive method of induced polarization for the possibility of estimating the depth of immersion of the ore body simulator. Experimental observations were carried out on a laboratory tank filled with sand, the observation time for each measurement point was 180 s, the sampling frequency was 1 kHz. In the course of physical modeling, measurements of the induced polarization parameter were carried out in the absence of an ore body simulator, with its immersion by 10 cm and 20 cm, as well as with full immersion and immersion to a depth of 30 cm. As a result of physical modeling with an ore body simulator, the following results: the dependence of the induced polarization parameter was obtained with increasing depth; with increasing depth, the change in the induced polarization parameter decreases; the background value of the induced polarization parameter in the absence of an ore body simulator leads to a decrease in the sensitivity of the measurement equipment.
Optimum control of an asynchronous electric drive
Authors: Tulyaganov Murot
Published: December 2022

The article proposes the main stages of compiling mathematical models for calculating and analyzing the dynamic and thermal modes of asynchronous motors in systems of an automated frequency electric drive are described. The application of the maximum principle and the Newton-Raphson method is given, as well as the solution of the problem using the maximum principle, which leads to a doubling of the number of differential equations. Under these conditions, the search for the initial values of auxiliary functions by the Newton-Raphson method is complicated by a circumstance associated primarily with the convergence of the method, since the convergence region occupies a small part of the coordinate space around the desired optimal point. To determine the required initial approximations, new method variable shift steps are proposed. The proposed method for improving the region of convergence of the Newton – Rafson method make it possible to calculate the optimal control parameters of a frequency-controlled asynchronous electric drive. Based on the calculation results, the curves of the basic and optimal starts of an asynchronous motor in a constant flow mode for the optimization criteria in terms of speed and minimum heating were obtained. On the basis of calculations and analysis of dynamic characteristics, practical conclusions were made. The results provide scientifically grounded recommendations to developers, designers and operators, as well as allow to improve the energy and performance indicators of automated frequency-controlled asynchronous electric drives intended for sectors of the national economy.
Evolutionary structural optimization of vulcanization molds
Authors: Glebov A O , Skomorokhova A I
Published: December 2022

A method of evolutionary topology optimization of vulcanization molds according to the criteria of the maximum temperature deviation in the volume of the rubber mixture from the set value and the mechanical compliance of the structure is proposed. To take into account the transient of the mold heating process, the condition of specific heat absorption in the volume of the processed rubber mixture is proposed. The problem of topology optimization of a mold for the manufacture of a rubber diaphragm has been solved. The analysis of the received results from the point of view of efficiency of the decision and manufacturability of a design is carried out. An engineering interpretation of the results of topology optimization has been carried out.
Assessment of the environmental impact on the life cycle of polystyrene thermal insulation materials
Authors: Zhukov A D , Zhuk P M , Stepina I V
Published: December 2022

The assessment of environmental impacts on the life cycle of thermal insulation materials is a complex task that has a significant impact on the market for heaters and the types of structures used. In this case, such important factors as the effective reduction of heat losses due to the use of foam plastics, the nature of raw materials for their manufacture, methods of processing and disposal, as well as possible effects associated with the presence of toxic components at different stages of the life cycle, should be taken into account. In addition to the analysis of generally accepted criteria related to energy costs, the impact on the greenhouse effect, the formation of photochemical smog, the destruction of the ozone layer, the acidification of water and soil, eutrophication, it is interesting to assess the local effects associated with the state of natural and man-made systems at all stages of the life cycle of thermal insulation products made of polystyrene. The article substantiates the need to assess the environmental impacts throughout the life cycle of expanded polystyrene in construction, including through the development of environmental declarations for these products. It is expedient to systematically collect waste heat insulation from expanded polystyrene, as well as to introduce modern methods of processing and disposal, including the use of biologically active living organisms. It has been established that the state of local natural-technogenic systems associated with the life cycle of expanded polystyrene boards correlates with indicators of global impacts in terms of ecological capacity and reproductive capacity for oxygen. Studies of boards made of graphite-containing polystyrene foam have confirmed lower environmental impacts, both by reducing the content of expensive polymer raw materials and by strengthening the structure.
Spectroscopic features of diphenylaryethylenes and arylpolyenes having substituted groups in pairs
Authors: Astanov Salih , Kasimova Guzal , Shamsiev Rustam
Published: December 2022

The spectral and optical characteristics of 4,4′ substituted stilbene and diphenylpolyenes were determined depending on the nature of the substituents. It is established that as a result of the dipole-dipole interaction of Van der Waals forces and the entrainment of the electron energies of molecules in the studied compounds, a botochromic shift of the adsorption and luminescence spectra is carried out. It is determined that for 4,4′ substituted arylethylene molecules with protonadonnor substituted groups, high values of the quantum yield of luminescence are observed, which are recommended for their use as fluorescence probes.
Calculation of surface contact interaction in friction
Authors: Rachishkin A A
Published: December 2022

The article briefly reviews analytical works on methods for calculating the parameters of contact interaction of rough surfaces. The influence of information technology development on scientific research and engineering problem solving is described. The contact of simulated surfaces is described. A number of assumptions are accepted and the principle of distribution of the protrusions of the rough surface is established. Further, the processes occurring during the contact interaction of rough surfaces in friction are described. Calculation relations are derived to determine the number of contact interactions between the protrusions of the surfaces under consideration. The volume of deformed material in the case of perfectly plastic deformation of its surface by absolutely rigid irregularities of the second surface is determined. The results of the work can be used for building calculation models of tribocouple wear and for the development of computer programs for modeling the processes of contact interaction of rough surfaces in friction.
Ferroelectric-superconductor structures properties
Authors: Pevtsov Evgeny , Demenkova Tatiana , Filimonov Vladimir , Golikova Olga
Published: December 2022

At the present time the urgent direction is to investigate the possibilities of new materials as a base for further improvement of very large-scale integration in order to create elements of submicron digital circuits with improved characteristics. The paper presents and discusses the results of measurements of volt-farad characteristics of structures with PbTiO3/YBa2Cu3O7-x ferroelectric films on strontium titanate substrate. New data on the characteristics of heterostructures with thin ferroelectric films are obtained, in particular it is shown that in the volt-farad characteristics of the studied structures local violations of the smooth forward sweep in the form of characteristic dips at the values of the applied field strengths close to the coercive ones determined by the ferroelectric hysteresis loops are observed. This effect can be explained by the emergence of built-in charges at the interface between a segmented dielectric and a high-temperature superconductor as a result of the polarization switching dynamics of the segmented dielectric. Quantitative estimates of the corresponding values of the embedded charges are made. Another explanation can be the assumption that the nature of these minima is related to the negative capacitance effect in segmentelectrics during polarization switching. The obtained results of the research serve as a basis for consideration of the observed effects in the design of a number of devices related to this subject area, in particular, non-volatile memory and gates based on MOS transistors, in the design of which heterostructures with ferroelectrics are used.
Experimental Study of Chip Shrinkage in Turning Titanium Alloy VT6
Authors: Pyatykh A , Timofeev S
Published: December 2022

The article proposes an analysis of the study of turning a titanium-based alloy used for the manufacture of surgical implants. The main focus is on machinability problems associated with the choice of rational cutting parameters, which determine the quality and durability of pedicle screws. The conclusion is made about the need for research aimed at ensuring maximum performance and application of practical data for the manufacture of medical implants. To carry out experimental studies, non-free cutting of a titanium alloy bar was performed with a cutter fixed in a turning dynamometer. Graphs of cutting forces versus cutting speed and feed were used to select an effective combination of machining parameters. A thermal imaging camera was used to evaluate the effect of processing parameters on the temperature of the processed sample. Conclusions are drawn about the dependence of the coefficients of longitudinal and transverse chip shrinkage on the processing parameters. The results of the research analysis show that when turning titanium alloy VT6, the coefficient of transverse chip shrinkage, which characterizes the broadening with increasing cutting speed, remains unchanged. The goals of further research aimed at clarifying the optimal cutting conditions for turning transpedicular fixation screws from VT6 were determined.
Wideband high-speed DAC-based frequency synthesizer
Authors: Romashov V V , Yakimenko K A , Doktorov A N
Published: December 2022

Wideband hybrid frequency synthesizer with phase-locked loop (PLL) and high-speed direct-to-analog converter (DAC) is presented. The use of special DAC operating modes allows to expand the synthesizer generating frequency band. Presented synthesizer also provides a low phase noise due to using RF mixer in PLL feedback.
Modeling the processes of extracting gas from gas hydrate deposits by means of coolant circulation
Authors: Davletshina M R
Published: December 2022

The article presents the results of numerical simulation of the process of gas extraction from a gas hydrate in a porous reservoir of finite length saturated in the initial state with hydrate The dependence of the decomposition velocity and front on the temperature of the coolant is shown. A quasi-stationary solution of the equation is constructed under these boundary conditions.
The effect of heat treatment on oxygen content and microstructure of near-surface areas of titanium hydride coated with tungsten carbide
Authors: Gorodov A I , Mogutova A A , Matyukhin P V , Romanyuk D S
Published: December 2022

The article proposes a method of magnetron vacuum deposition of tungsten carbide coatings on spherical hydride granules. The article also illustrates the features of the microstructure and the uniformity of the resulting coating. The effect of heat treatment on the oxygen content in the near-surface areas of titanium hydride coated with tungsten carbide is investigated. The features of the coating structure were studied using by scanning electron microscopy (SEM) with a built-in energy dispersion spectrometer. Comparative data on thermal oxidation of uncoated spherical granules and granules coated with tungsten carbide are presented.
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Geometric modeling of drilling bit rolling cutters by generalized Hermitian splines
Authors: Sharipov Kakhramon , Akhmedov Yunus , Toshev Ilyos
Published: December 2022

The effective algorithms for calculating the theoretical profiles of the gauge surfaces of various bits have been developed, which reproduce such profiles using spline functions with precision up to the resolution of graphic devices on modern computers. Execution of the profile of gauge surface close to the theoretical one (especially for large-diameter bits with displaced axes of rolling cutters) can increase tool life by reducing the loss of diameter during bit processing. The proposed algorithm allows, based on well-known and rather routine method of calculating the elements of the gear armament, to develop automatic algorithm for calculating the cutting structure of crown, requiring the designer only to fill in a particle of initial data and then visually evaluate the displayed results.
Research of the oscillation process of raw cotton during transportation
Authors: Rakhmanov Khayridin , Fayziev Sirojiddin , Mirzayeva Sayyora , Toyirova Gulnoza
Published: December 2022

Theoretical research of the transportation process of the raw cotton with a tractor-trailer is given in this article. In order to ensure the safe transportation of raw cotton, the law of oscillation of the movement of the trolley on a rough road with a constant speed is determined. A theoretical analysis of the change in the amplitude of body oscillations is given and it is established that a practically constant and significant change in its values occurs only near the resonant frequency. The oscillation frequency in the low frequency zone is determined. In order to remove body oscillations from resonance, a speed limit that satisfies the conditions v < 8.1l/2π or v > 8.1l / 2π is set. Moreover, the research results of the impact of viscous properties of the transported raw cotton on the amplitudes of oscillations of both the upper and lower boundaries of the body, as well as on the moduli of oscillations and elastic force at various values mod F = C
0|y
0 − y
1| of viscous friction are given.
Deformations of elastic aftereffect: the effect of long – term strength loadings and concrete work diagram
Authors: Sodikov K Sh
Published: December 2022

The article presents data on the deformation of the elastic aftereffect of concretes of various compositions, at different stress levels of prolonged loading, the effect of prolonged loading on the strength and the diagram of concrete work. Development of relative creep deformations and elastic aftereffect of steamed concrete. The development of relative creep deformations and elastic aftereffects of natural hardening concrete of the B series under stress. Data on the effect of prolonged loading on the strength of the studied concretes. Development of relative creep deformations e_p(t) including deformations of elastic aftereffect after unloading of samples. Data on the effect of prolonged loading on the strength of the studied concretes.
Well production increased when drilling horizontal wells
Authors: Toshev Sherzod , Rakhimov Bobomurod
Published: December 2022

The article provides information about the technology of drilling horizontal wells, horizontal wells drilled in our republic, horizontal well profiles, determining the debit of horizontal wells, the rational use of reservoir energy in horizontal wells, and achieving high flow rates of horizontal wells.
Experimental investigation of the relationship between raw shaft density and saw cylinder electric motor load current
Authors: Sharibaev Erkin , Abrorov Akbar , Otaboev Bobir , Sharibaev Nosir , Daliev Abdunabi
Published: December 2022

In this research, the work was carried out to create and analyze mathematical models of steady technological processes in cotton cleaning, to obtain analytical expressions for the time of cotton and fiber processing and the time of turning raw materials into finished products. In addition, mathematical models for unstable technological processes in cotton cleaning were created and analyzed. Detailed information is provided on the technology of performing these works, the devices used, their operation, their efficiency, and ways to increase their efficiency.
NalTA energy in molecular sieve guest-guest interactions energetics of host-guest interactions in NalTA molecular electrics
Authors: Rakhmatkarieva F , Ergashev O , Davlatova O , Kokhkharov M , Khudoyberganov M , Abdurakhmonov E , Abdulkhaev T
Published: December 2022

The paper analyzes the isotherm and differential heats of adsorption of carbon dioxide in NaLTA and establishes the molecular host-guest mechanism of interactions in the molecular sieve matrix.
Justification of the design parameters of the compaction roller for creating longitudinal boards in the rows of cotton
Authors: Abdualiev N Kh
Published: December 2022

The article describes the formation of longitudinal and transverse slopes in Bukhara, Navoi, Khorezm, Kashkadarya regions and the Republic of Karakalpakstan. To date, sufficient research has not been conducted to create a new design, expand the capabilities and substantiate the parameters of the working bodies, although longitudinal thresholds are formed with the help of the developed devices, but in ensuring the quality and durability of the formed longitudinal thresholds. In this article, a theoretical study was carried out based on the parameters of the working body of the capacitor of longitudinal overlaps between rows of porous ones. As a result of theoretical studies, it was determined that the angle of inclination of the conical part of the capacitor cathode of the device should be 38 °, the total width of the cathode is 40 cm, the width of the conical part is 15 cm, the diameter of the cathode is at least 20.05 cm, the large diameter of the conical part 43.48 cm. As a result of the use of a device for the formation of a longitudinal bollard in the aisles of cotton, equipped with a sealing working body, a 46.2% reduction in manual labor was achieved, labor productivity increased 1.5 times.
Determination of heat efficiency in drying cotton raw materials in cotton grinding factories
Authors: Shodiev Ziyodullo , Sobirov Komil , Urinova Aziza , Shodiev Azimbek
Published: December 2022

One of the most important requirements to be studied in the transportation of raw cotton is to maintain its natural quality. Therefore, most researchers focus on the study of seed injury, as it affects the quality of the finished product, the negative effects on the characteristics and quality of technological spinning have been studied. To study the changes in fiber quality, effective methods and tools are used to process the results obtained as a result of the application of modern methods depending on the drying intensity in the drum dryer. As a result of technological processes (drying, cleaning, ginning) on all quality indicators were carried out in the laboratory of the Capital Cotton Ginning Plant and laboratory tests of the Association “Quality”. The composition of the mass fraction of the cover and the weed layer of the fiber were analyzed manually by the standard method. The method of mathematical planning of the experiment was used to perform and process the results of the experiment. For our study, a complete factorial experiment method of type PFE-23 was selected. Empirical data processing showed that the most important factors that significantly affect the quality and performance of drying are: - water temperature, heat carrier flow rate, raw cotton dryer performance, cotton initial humidity and drum shell heating temperature. In this regard, the following factors were selected for further experimental studies: initial humidity and drum mantle heating temperature when performing seed cotton dryers on wet cotton. In the process rules depending on the initial moisture content of the raw sawdust, the heat transfer rate ranges from 18 to 22 thousand m3 / s. On this basis, in experimental studies, we select an average value of heat transfer flow rate of 20 thousand m3 / h. The temperature of the dryer is selected from 1300 to 1900 according to the amount of initial moisture in the cotton.
Ways to intensify the heat exchange process during heating of liquid carbohydrates
Authors: Abdurakhmonov Olim , Islomov Alisher
Published: December 2022

The article presents the results of the study of the heat exchange process during non-heating of hydrocarbons. Heat transfer between heat carriers occurs mainly through thermal conductivity, convection. The intensity of heat transfer decreases when gases are formed in the composition of the heated liquid hydrocarbon. As the temperature of the heated hydrocarbon mixture increases, the gas formation in the apparatus, their partial increases, respectively. The value of the heat transfer coefficient characterizes the intensity of heat exchange between the wall and its surrounding working environment – by steam or liquid. The results of determining the main physicochemical and thermo-physical parameters of hydrocarbon heat carriers in liquid and vapor states are presented.
Research of impact of discharge parameters of electric impulse on the damage of tissue cells of the fig and the drying process and determination of its parameters
Authors: Akabirov Lazizjon , Narziyev Mirzo , Khujakulova Nilufar
Published: December 2022

The results of experimental research of improving the process of drying the locally grown figs by their initial treatment in an electric pulse field are given in this article. The results of the experiment were processed by mathematical statistics methods. The degree of tissue damage of the fig fruit is related to electric impulse discharge voltage. The results of the experimental research were conducted in order to determine the degree of tissue damage of fig fruit related to electric impulse discharge voltage. Processing of the results of all the experiments presented in the article with statistical methods was carried out based on the above methodology. The rest of the experimental results and statistical processing results are given in the form of tables and conclusions.