bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of generalized requirements for automated electric drive of cable equipment
Authors: Tsypkina V. V. , Ivanova V. P. , Isamukhamedov D. N. , Turabekov A. U. , Atamukhamedova R. F.
Published: August 2023

The article deals with the production of cable and wire products and the operation of cable processing equipment. The technological parameters of cable machines are analyzed by maintaining the range established by the regulatory documentation, and the main task of ensuring the efficiency of the technology is formulated. The requirements for automated electric drive of cable equipment are analyzed, considering the harsh modern operating conditions of cable products. The work of modern cable equipment with a high level of automation of the technological process and existing cable machines with a service life of more than 10 years is considered. The possibility of creating a unified automatic control system for both the entire technological process and a separate technological operation by creating a flexible control system for a separate cable machine with the further formation of a full-scale digital environment for the entire cable enterprise is analyzed. The developed generalized requirements for the automated electric drive of the cable machine made it possible to conduct research on specific cable equipment the VSK-13 drawing machine by creating a simulation model, and the obtained results of mathematical modeling gave good results on the computational experiment of the electromechanical system of the VSK-13 drawing machine.
Conducting experimental studies of cement concrete pavement joints
Authors: Aripov Khodzhiakmal , Muminov Kurbon , Kochkharov Yakubjon , Khushvakhtov Jakhongir
Published: August 2023

To increase the life of roads in our Republic, several reforms are being carried out to operate roads with high strength and efficiently use available materials. Experience in constructing cement concrete roads shows that, over time, elevations of several millimeters can form between the slabs. The formation of disturbances hurts the longitudinal plane of the carriageway. It increases the driving resistance, makes the movement of vehicles uncomfortable, and causes the vehicles to oscillate. This increases the load on the roadway. Therefore, the study and development of recommendations for forming a shift between cement concrete paving slabs are relevant today. A study of negative changes (formation of steps) of the cement concrete pavement from dry-hot climatic conditions and over time in longitudinal, transverse compression, transverse expansion, floating, false, and working seams is presented. The results were obtained on 315320 km of highway A 380 “Guzor-Bukhara-Nukus-Beyneu” by measuring the heights and subsidence of the plates of transverse expansion joints with an electronic caliper and protractor. Using a mobile laboratory machine, “Ford Terrassa”, the longitudinal smoothness of the coating of this object was determined, and the results were obtained. Then a correlation plot of the effect of variation between plates (steps) on the smoothness of the coating (IRI) was plotted.
Use of mathematical model of artificial neural network for current forecasting of tax base of region
Authors: Yakubov Maksadkhan , Turgunov Adilbek , Jamalova Gulchekhra
Published: August 2023

In the article, the method allowing the possibility of a neural(neuronic) network for forecasting the tax base of a region is offered. The given method is suitable for working out of the positive short-term forecast.
Investigation of physical and mechanical properties of non-autoclaved aerated concrete from prescription and technological factors
Authors: Vladimir Soy , Bekkulov Valijon
Published: August 2023

With the development of science and technology in the field of building materials science, with the advent of new chemical modifiers and mineral fillers, new composite building materials (KSM) will be obtained. The development of the theory of composite materials makes it possible to obtain building materials with predictable physical, mechanical, and technological properties that meet specific requirements and improve the technology while reducing the energy consumption of the production of products.
Investigation of nonlinear oscillations of high rise flue gas stacks under various kinematic effects
Authors: Ishmatov A. N. , Yuldoshev B. Sh. , Khazratkulov I. O. , Urinov B. Kh.
Published: August 2023

A detailed analysis of the current state of the problem is presented in the article. A mathematical model is given to assess the dynamic behavior of high-rise structures, considering geometric nonlinearity (nonlinear dependence of strains on displacements) under periodic kinematic effects and the own weight of the structure. The unsteady forced oscillations of the high-rise flue gas stack of the Novo-Angrenskaya HPP were studied considering the geometric dimensions of the stack and the physical and mechanical characteristics of the material of the structure. The influence of dissipation in the material, leading to rapid or gradual damping of vibrations depending on the frequency spectrum of natural vibrations in one direction or another, as well as geometric nonlinearity, leading to an increase in the amplitude of vibrations at a low energy dissipation in the structure, and resonant impact, causing significant displacements of the structure. The predominant effect of energy dissipation in the material on the pattern of the dynamic behavior of a high-rise structure is observed compared to geometric nonlinearity.
Buildings and structures corrosion of metal structures and effectiveness of its prevention
Authors: Murtazayev E. M. , Latipov Sh. A. , Norchayev A. J. , Toshtemirov S. J. , Kholov K. N.
Published: August 2023

In this article, metal structures can be partially or completely destroyed during the corrosion of building and building structures. Prepared buildings and structures, pipes, tanks, and other structural materials corrode (rust, collapse, and collapse) during operation, causing great damage to the manufacturing industry. The corrosion rate is unknown, and methods have been developed to combat corrosion.
Physical and mechanical properties of anaerobic sealants
Authors: Toirov I. J. , Batirov Z. L. , Razzakov T.
Published: August 2023

The article presents the main causes of wear on the seats of rolling bearings during operation, which are fretting corrosion and turning of the inner and outer rings of bearings. Installed that an effective way to protect metal surfaces from fretting corrosion is to place an intermediate medium between them. Coatings with a small modulus of elasticity are applied to one or both contacting surfaces to create an intermediate medium. Using anaerobic sealants as coatings with a small modulus of elasticity is recommended. Anaerobic sealants, which are multicomponent liquid compositions capable of remaining in the initial state for a long time without changing properties, quickly cure at temperatures of 20-25° C and in case of violation of contact with oxygen in the air with the formation of a durable solid polymer. The application technology of anaerobic sealants is presented, and the influence of temperature, talc, and copper on the physical and mechanical properties affecting the durability of fixed joints is studied. According to the results obtained, using the AN-6K and AN-103 brands of anaerobic sealants is recommended as the most effective for restoring fixed joints of rolling bearings and increasing their durability. The article substantiates the influence of temperature and various fillers on the physical and mechanical properties of anaerobic sealants; based on these results, the brands of sealants suitable for restoring fixed joints from rolling bearings are recommended.
Improving the temperature resistance of traction electric motors using a microprocessor control system for modern locomotives
Authors: Jamilov Shukhrat , Ergashev Otabek , Abduvaxobov Muslim , Azimov Sobir , Abdurasulov Sherzamin
Published: August 2023

Temperature control of traction electric motors running on direct current with the help of a modern microprocessor-based locomotive control system is analyzed in the paper. Development of a methodology for calculating the temperature of the windings of traction electric motors operating on direct current, based on a modern control system has been discussed. To determine the dependence of the temperature of traction motors on the motion profile and weight of the rolling stock.
Tension of ground pressure on the foundations of railway catenary supports
Authors: Lesov K. S. , Rasulmukhamedov M. M. , Mavlanov A. Kh. , Kenjaliyev M. K.
Published: August 2023

This paper presents the results of calculations of the values of soil pressure stresses on the base of the contact network supports by the developed program NDGFOKS in the programming language - C#. Design and construction of the foundations of the contact network supports is provided in accordance with the requirements of regulatory documents and technological charts. When selecting the methods of fastening the overhead contact network supports in the ground of the earth bed, experience in construction of overhead contact network supports in various engineering and geological conditions was taken into account. The methods of calculation of load-carrying capacity of the contact network bases on the ground were analyzed. Methods of fastening the overhead contact network pylons, including those on the weak ground bases, were given. The NDGFOKS program has been developed in the C# programming language in order to calculate the stresses of soil pressure on the foundation faces. The program has been developed taking into account the variety of soils, the characteristics of foundations and the methods of their driving. A block diagram and a diagram of the stresses of soil pressure on the foundations of the contact network supports at different foundations are given.
Cable conductor of cabling and wiring products based on composite materials for transport systems
Authors: Tsypkina V. V. , Ivanova V. P. , Jurayeva K. K.
Published: August 2023

The article deals with the issues of working out the technology of manufacturing cabling and wiring products that are used in railway transport systems. A cable conductor for a cable product, made on the basis of composite materials, was adopted as the object of research. The technology of production of composite billets and wire for cable products for subsequent drawing, as well as ways of obtaining them, is covered in detail. Special attention is paid to the problems of operation in railway transport, power transmission systems, which confirms the relevance of the research. The increase in the cost of the finished product is due to the violation of the technology, which is associated with the structural diversity of the layers of the composite long-length billet, determines the need to maintain the constancy of its plastic properties along the entire length. By means of a generalized mathematical model of the drawing process and on the basis of reference data, calculated parmeters of technological extracts were obtained for the layers of the composite billet to be drawn. The results of the research work made it possible to develop a methodology for calculating the technological modes of operation of the drawing machine and to determine the optimal technological parameters of the technological equipment.
Methods of new technological developments of electric motors based on soft magnetic materials
Authors: Berdiev U. T. , Kolesnikov I. K. , Tuychieva M. N. , Khasanov F. F. , Sulaymonov U. B.
Published: August 2023

Application conditions of composite materials based on ASC100.29 iron powders with an oxide coating in electrical machine devices as a stator with improved performance are considered in the article. The conditions for increasing the stability of the operation of electric motors are determined based on changes in the thickness of the oxide layer. Three-dimensional models of magnetic circuits were used, which made it possible to achieve a force of up to 4500 N with a torque of 3 to 8 Nm, which made it possible to obtain an engine power of 100-200 W. As a result, experimental characteristics of dependences μ=f(h), H=f(h)) and the power of specific losses on the thickness of the oxide coating ωyд=f(h) were obtained. Methods for measuring the dynamic characteristics of the stator magnetic circuit are determined.
Additive manufacturing of bionanomaterials for biomedical applications based on TI6AL4V and PLA: a systematic review
Authors: Evlen Hatice , Ziyamukhamedova Umida , Juraev Dilmurod , Abdukarimov Mirzohid
Published: August 2023

Additive manufacturing (AM) is the owner of a huge potential as a manufacturing technology in fabricating functional implants, and scaffolds for biomedical applications. AM, which includes 3D printing (3DP) and 3D bioprinting, can be the solution to produce several needs such as scaffolds/implants, tissue or organs, or medical devices by combining different biomaterials with nanomaterials. Titanium and its alloys and Polylactic acid (PLA) are commonly used in bone tissue repair with their superior bio-functionality. The rapid advancement of three-dimensional (3D) printing technology has enabled the fabrication of porous titanium and polymer composite scaffolds with controllable microstructures, which is regarded as an effective method for promoting rapid bone repair. An electronic literature search was conducted in PubMed, Web of Science, Scopus, Elsevier, Embase, and other numerous databases up to December 2021 which are accessed by Karabuk university. To evaluate the possibility of bias and methodological quality, the SYRCLE tool and the last version of the CAMARADES list were used, respectively, a meta-analysis could not be performed. This systematic review is aimed to evaluate the common biomedical potential of 3D-printed porous Ti6Al4V (Ti64) and PLA matrix scaffold for repairing bone defects to investigate the influential factors that might affect its osteogenic availability. The most ideal parameters for designing the Ti64 scaffold were found to be a pore size of around 300-400 m and porosity of 60-70%, while PLA scaffolds show 350-400 m and nearly the same percentage in porosity as Ti64.
On the unique solvability of a nonlocal boundary value problem with the poincaré condition
Authors: Abdullaev A. A. , Safarbayeva N. M. , Usmonov B. Z.
Published: August 2023

As is known, it is customary in the literature to divide degenerate equations of mixed type into equations of the first and second kind. In the case of an equation of the second kind, in contrast to the first, the degeneracy line is simultaneously the envelope of a family of characteristics, i.e. is itself a characteristic, which causes additional difficulties in the study of boundary value problems for equations of the second kind. In this paper, in order to establish the unique solvability of one nonlocal problem with the Poincaré condition for an elliptic-hyperbolic equation of the second kind developed a new principle extremum, which helps to prove the uniqueness of resolutions as signed problem. The existence of a solution is realized by reducing the problem posed to a singular integral equation of normal type, which known by the Carleman-Vekua regularization method developed by S.G. Mikhlin and M.M. Smirnov equivalently reduces to the Fredholm integral equation of the second kind, and the solvability of the latter follows from the uniqueness of the solution delivered problem.
Improving the infrastructure of the stock market in the context of economic modernization
Authors: Khujamurodov A. J. , Djalilov F. A. , Khamzaev A. N. , Umarkhujaev A. M.
Published: August 2023

The article describes the economic essence of the stock market infrastructure and the main directions of its formation, the scientific and theoretical basis. The foreign experience of the stock market infrastructure and stock exchanges has been studied, and opportunities for their application to the stock market of Uzbekistan have been identified. Analysis of the institutional, technical and functional bases of the stock market, the economic situation in the stock market of the Republic of Uzbekistan. Factors influencing the development of stock market infrastructure were systematized and analyzes were performed on the autoregressive distributed lag ARDL model based on the factors influencing the stock market infrastructure (UCI) and their complex econometric methods.
Some aspects of comparing the operational properties of synchronous machines with a conventional and two mutually shifted excitation windings
Authors: Pirmatov N. B. , Egamov A. M. , Giyasov C. M. , Mamarasulov N. A. , Berdiyorov U. N. , Ergashov Sh. O. , Nizamov J. A.
Published: August 2023

A comparative analysis of the operational properties of traditional and two-valve synchronous machines with a rotor, having a reciprocating axis, excited from independent regulated DC sources, is generalized. On the basis of research, it has been shown that the use of a control quadrature excitation winding significantly improves the performance of synchronous machines at low costs for its manufacture. The authors have shown a significant improvement in the performance of machines with different operating modes based on the results of theoretical and experimental studies carried out on synchronous machines with a rotating axis of magnetic saturation, attached to various designs of quadrature excitation winding. It has been recognized that neglecting magnetic saturation in performance calculations for synchronous machines leads to significant estimation errors properties of the studied machine. In addition, the advantages of synchronous machines with sine-cosine field winding are shown. With an insignificant complication of the manufacturing technology, it opens the way to solving the problem of creating energy-saving turbine generators, which have a property that is very important for the practice of operation, i.e. an almost unchanged (sinusoidal) shape of the resulting magnetic field in the air gap of the machine within the allowable range of load variation under steady-state symmetric modes.
Obtaining new types of compounds between silicon and cadmium sulfide
Authors: Sapaev I. B.
Published: August 2023

The n+CdS-nCdS-nSi+ structures were obtained, and their volt-ampere characteristics at different temperatures were studied. The dependence of the volt-ampere characteristic shows that the sublinear and quadratic section of these structures has a section of current growth with voltage. It is determined that the n+CdS-nCdS-nSi+ structures in the current flow direction at low illumination levels work as an injection photodiode. And these structures under laser illumination with λ=0.625 μm and power P=1.2 µW/cm2 have spectral sensitivity 2042 A/W, bias voltage 10 V. At irradiation by white light with energy W=3.6-10µW·s it has integral sensitivity ≈21 A/I'm (2310 A/W) at bias voltage U=10V.
Improving condition of desert pastures by planting saxaul and cherkez plants
Authors: Farmonov Erkin , Kamilov Asil , Gorlova Irina , Sharipov Zayniddin , Ro’ziyev Dilshod
Published: August 2023

The article provides information on large degraded areas in almost all areas, of which 17.5 million hectares of dry natural pastures are allocated for cattle breeding out of 32 million hectares of desert and semi-desert areas in Uzbekistan. It is also noted that 40% of desert and semi-desert pastures have degraded pastures to varying degrees, the average productivity has decreased by 20-30%, and 8.0 million degraded pastures should be improved first. To improve the condition of degraded desert and semi-desert pastures, the authors noted that it is possible to increase their productivity by 10-15 times due to the establishment of cultural pastures by replanting nutritious wild plants and comparing their productivity. To improve the productivity and ecological restoration of degraded livestock pastures in our Republic's desert and semi-desert areas, he considered the mechanization of planting saxovul and cherkez plants from nutritious shrubs and developing a planting unit for this purpose. For this purpose, the devices used in planting the seeds of plants with the same physical and mechanical properties as the desert plants from the seeds of nutritious plants growing naturally in the wild in our Republic and foreign countries and their shortcomings have been determined.
Assessment of economic efficiency of combined power plants based on renewable energies
Authors: Kan Eduard , Mukhammadiev Muradulla , Dzhuraev Kurbon , Abduaziz Uulu Abdurauf
Published: August 2023

Energy plants based on renewable energy sources can be combined according to the type of energy source (hydro, solar, wind with or without hydro storage). Currently, not enough attention has been paid to assessing the economic efficiency of combined power plants incorporating a hydraulic accumulator. When designing combined power plants, it becomes necessary to choose the composition of such plants and evaluate their economic efficiency. The purpose of this study is to justify the possibility of applying the present value method to select the composition of combined heat and power plants and assess their economic efficiency. The research used the following methods: review, synthesis of existing literature on the subject, system analysis, collection of data on different types of power plants, and calculation of their economic efficiency. A computer program has been compiled with Turbo Pascal 7.0 for the calculations. The calculations have shown that a cost-effective option is a combined power plant based on a wind power plant and a hydropower plant with a hydro accumulator.
Optimal organization of dry lands in case study of Uzbekistan
Authors: Ruziboev S. , Mukhumov A. , Usmanov Y. , Babakhulov Sh.
Published: August 2023

The article showed that the internal land development projects, which include the organization of the territory, along with other measures, will give certain positive results in the rational organization of the use of dry land. Land planning projects developed based on land assessment data create an opportunity to optimize areas of arid lands and crops and justify the economic and technical-organizational aspects of the effective organization of agricultural production in these areas. The results of the conducted scientific research confirmed that in organizing the use of dry arable land in the plain region, first, it is of great importance to search for water sources in these areas, including the study of underground water sources and to positively solve the issues of water extraction by digging artesian wells. Using the data of soil monitoring in dry areas, the soil's natural fertility, its production characteristics, and the possibilities of its use in agriculture were considered to organize the agriculture of the region. Special agrotechnology for soils in dry areas was proposed. In this case, the use of secondary resources available in the republic (low-grade phosphorite, non-traditional agro-ores, various wastes) in field conditions on low-productivity lands (credit score below 40); it was recommended to obtain new organ mineral fertilizers by applying biotechnological methods on farmlands. Organ mineral fertilizers are prepared by composting based on manure and low-grade coal phosphorites in a ratio of 9:1 for 4 months. Other organ mineral fertilizers are made because of Angren low-grade coal and Central Kyzyl-Kum phosphorite flour. These fertilizers have been tested in farm conditions. The use of the proposed technology is resource efficient and solves environmental problems. When applying this technology, soil fertility is restored and improved, the amount of organic matter and organic matter in it increases year by year, the cost of mineral fertilizers is 30-40% and more, and the cost of organic fertilizer is 3-4 times allows to reduce. According to the research results, an additional harvest of 10-12 s/h was obtained from winter wheat.
High-current contactless ferromagnetic converters for multi-profile monitoring and control systems
Authors: Plakhtiev Anatoliy , Gaziev Gayratjon , Doniyorov Odil , Muradov Khayot
Published: August 2023

The article shows that the undesirability of breaking the current circuit for the temporary inclusion of electrical measuring devices, the presence of large power losses on shunts, the impossibility of breaking the circuit under the conditions of the technological process, as well as safety requirements caused contactless conversion and measurement of large DC currents in circuits without breaking them in metallurgy, electrochemical industry, railway transport, in laser technology, renewable energy sources, land reclamation, irrigation and in general in agriculture. Lightweight detachable wide-band stationary and portable non-destructive contactless converters and meters of large direct currents are not yet mass-produced worldwide. Therefore, it is very important to develop and study contactless converters and meters of large direct currents, having an extended range of converted currents with small dimensions and weight and increased accuracy and sensitivity, a simplified and technologically advanced design with low material consumption and cost, and the ability to convert both constant and variable high currents and fixed sensitivity control. All these requirements are met by the effective multifunctional magneto-modulating contactless converters of large direct currents developed by us. The results of the development of one of them are given in the work. The issues of its dynamics are considered. The results of his research are shown. It was found that the transition time for him is 0.025 of the period of the industrial frequency. Therefore, it can be considered practically inertia-free. The developed effective multifunctional magneto-modulating contactless converter can be widely used in monitoring and control systems in water supply, land reclamation, and irrigation, industry, railway transport, metallurgy, science, technology for contactless monitoring of constant and alternating currents, as well as for checking electric meters at the place of their installation.
Innovative ridge tillage of soil with simultaneous sowing of seeds of industrial crops and with laying of drip irrigation hose on ridge
Authors: Shaimardanov B. P. , Berdimuradov P. T.
Published: August 2023

The article presents the results of research on the development of technology for comb cultivation of industrial crops with targeted and uniform moistening of the root system of plants. Innovative ridge tillage of the soil with simultaneous sowing of seeds of industrial crops and with the laying of a drip irrigation hose on the ridge, the accumulation of moisture is excluded, which leads to the pollination of the soil, destruction of the structure and formation of a soil crust, this contributes to the production of friendly seedlings, good plant development and obtaining a high yield of raw cotton with early ripening.

The drip irrigation system allows you to provide plants with water and fertilizers. The drip irrigation system, with the laying of flexible perforated irrigation tapes on ridges along its entire length, is carried out simultaneously with the sowing of cotton seeds, which eliminates the manual layout of irrigation hoses, and eliminates time-consuming manual operation during feeding and further watering. The use of drip irrigation guarantees higher yields, as well as provides savings in labor, water, and energy resources.
Method of orientation of solar panels of solar power plant
Authors: Mirzabekov Sherzot
Published: August 2023

The generation of electricity by solar photovoltaic batteries depends on the angle of incidence of sunlight and is maximum when this angle is 90 degrees, i.e., rays fall strictly perpendicular. The greater the deviation from the 90-degree angle, the more radiant energy is reflected rather than extinguished by the solar modules. Therefore, it is especially important to correctly orient the surface of solar modules and set the desired inclination angle. To place photovoltaic panels on the site of a solar power plant, it is necessary to calculate their mutual shading, considering the design and dimensions of one solar cell panel and the method of its installation on the ground at a certain calculated angle.
Thermal sensor based on si single crystal implanted with different parties P+ and B+ ions
Authors: Bekpulatov I. R. , Saliyeva Sh. K. , Saidakhmedova Z. R. , Rasulova D. T.
Published: August 2023

The characteristics of existing temperature sensors based on silicon monocrystals are analyzed, and the reasons for the limited upper limit of temperature measurement are established. To increase sensitivity, expand the range of measured temperatures, and obtain a linear output characteristic of the temperature sensor, the authors propose to carry out phased implantation of P+ and B+ ions with decreasing energy in different directions of the Si(111) crystal followed by brief thermal, laser or IR radiation after each stage ion implantation. The distribution profiles of P and B atoms implanted into Si with a gradual decrease in energy are studied. The effect of subsequent thermal and IR annealing on the atomic distribution profiles and the characteristics of a thermal sensor was investigated.

A p-i-n diode with a high concentration of electrically active atoms (NP=1021 cm-3, NB=2·1021 cm-3), with almost a step distribution of P and B atoms and a sharp boundary p-i and i-n was created areas with a high thermal sensitivity of 2.3 mV/K in a wide temperature range of 20-550 K.
Electronic-physical model that determines thermal conductivity of walls made of various materials
Authors: Denmukhammadiev Aktam , Pardaev Abror , Kucharov Farrukh , Nasimova Lobar
Published: August 2023

The article analyzes data on creating an electronic-physical model designed to determine the thermal conductivity of walls from various loose or solid materials used in the agricultural sector and construction. At the end of 2022 and the beginning of 2023, during the abnormally cold winter days observed in the Republic of Uzbekistan, accidents were observed at many construction sites and in heating networks. In response to this, by the government's decision, practical work was carried out to cover buildings' outer part (facade) with special basalt material. The studies of one-dimensional heat transfer in a compound cylinder carried out in a stationary mode at a constant thermal conductivity of the material, are analyzed. In these studies, heat conduction equations were studied with the results of heat transfer simulations developed using the Ansys software. The electronic-physical model proposed in the article allows you to quickly and accurately measure the heat and thermal diffusivity of walls made of various materials. It will be possible to intelligently control the electronic-physical model using thermal sensors. The article contains detailed engineering calculations and illustrative materials. Internet data was analyzed, and specific conclusions were drawn. The prerequisites for the creation of an intelligent system for measuring the temperature and thermal conductivity of walls from various bulk materials are made in the work.
Determining parameters of grinder rotor and its blades
Authors: Gapparov Sh. X. , Karimov R. R. , Choriyev R. M. , Musurmonov I. E.
Published: August 2023

The rotary crusher allows you to qualitatively grind pressed roughage. The authors proposed and developed an improved technological scheme of an impact crusher equipped with two beaters for dosed transfer to the grinding chamber. The impact crusher consists of a transfer chute, metering beaters, a chopping chamber, a rotor, chopping knives, fixed knives, an exit chute, a feed bin, and an electric motor. Work efficiency is determined by the following parameters: length, width, and thickness of knives, rotor speed. The purpose of the work is to substantiate the parameters of the rotor and its knives. Analytical dependencies are obtained to determine the parameters of the knife. Theoretical studies have established that the minimum length of the knife should be 6.9 cm, the width of the knife should be 50 mm, and its thickness should be 4 mm. A model for the theoretical calculation of the probability of grinding roughage of the required size within the limits of zootechnical requirements has been obtained. Based on the calculations, the probability of cutting the feed of the required size, depending on the number of rotations of the rotors, was established.
Kinematic parameters of flow constrained by combined dams with through part of tetrahedra in compression region
Authors: Bakiev Masharif , Khalimbetov Azat , Yakubov Kuvonchbek , Sagin Jay , Asamatdinov Ilyas
Published: August 2023

Every major river in the world consists of mountainous, foothills, and flat areas characterized by different flow regimes. The foothill areas differ in slopes i = 0.001 ÷ 0.004, flow kinetics Fr > 0.15, and the size of sediments. The riverbed is unstable, and the banks are prone to erosion. The construction of coastal protection structures requires solving complex issues related to their design. The analysis showed that most of the studies, including ours, were carried out for the conditions of lowland rivers. This work aims to establish the flow features of the foothill sections of a combined dam with a through part of tetrahedra when the ratio of the through part ℓs to the total length of the dam ℓd is greater than or equal to 0.5, i.e., ℓs/ℓd. ≥ 0.5 The presence of a satellite flow behind the through part, a weakly perturbed core, and the presence of two zones of intense turbulent mixing was experimentally established, and the universality of the velocity distribution, which obeys the theoretical dependence of Schlichting-Abramovich, was confirmed. It is once again confirmed that the dependence is on the slope of the bottom, the Froude number, the degree of constraint, and the formation of "calm" and "critical" flow modes. The nature of the level changes along the length of the compression region in the core, and the satellite flow differ from each other, and the alignments occur in the vertical compression alignment. The problem is implemented for the "calm" mode using an integral relation characterizing the law of conservation of momentum in the flow, the equation of conservation of flow, and the differential equation of uneven motion recorded for the satellite flow behind the through part of the combined dam. The presence of a satellite flow, two zones of intense turbulent mixing, and the different nature of the leveled regime of the main and satellite flows are taken into account. A comparison of theoretical solutions with experimental ones shows their similarity.
Determination of flight time of particle after reflection from lid of mixing chamber of mixer
Authors: Mamatov Farmon , Eshdavlatov Eshpulat , Yarieva Z. , Alikulov Tuygun , Eshdavlatov Akmal
Published: August 2023

An improved design of the continuous mixer cover is proposed. The mixer cover has reflectors mounted on the work surface and made as plates. The reflectors are positioned at an acute angle to the working surface of the mixer lid. The top of the reflector is facing in the direction opposite to the direction of movement of the feed particles. The aim of the study is the theoretical study of the trajectory of the feed particles to determine the axial velocity of the feed mixture in the free space of the mixing chamber of the continuous mixer. The trajectory of the feed particles in the mixing chamber of the mixer has been studied. The equations for determining the flight time of the particle after reflection from the lid of the mixing chamber of the mixer are obtained.
Ridge forming machine for sowing cereals on sloping fields
Authors: Mamatov Farmon , Mirzaev Bakhadir , Maxamov Xujaaxmad , Tovashov Rustam
Published: August 2023

Traditional technologies and machines for sowing cereals lead to increased water erosion on sloping fields and the washout of crops, respectively, causing a sharp decline in yields. The authors proposed anti-erosion technology and machinery for sowing cereals on sloping fields. The research aims to justify the parameters of the ridge forming machine for sowing cereals on sloping fields. The basic principles and methods of classical mechanics, mathematical analysis, and statistics were used in this study. Based on theoretical studies, analytical dependences for determining the parameters of a ridge forming machine in the form of a flat half-disk have been obtained. It was found that the ridge spreader's radius should be 19.5 cm, its height should be 39 cm, and the angle of the disk set to the direction of movement should be within the range of 28-30°.
Study of methods of chemisorption purification of hydrogen sulfide in natural gases with natural sorbent
Authors: Fayzullayev Normurot , Mamadoliev Ikromjon
Published: August 2023

We know from the literature that the cost-effectiveness of using zeolites to purify natural gas is much higher than other natural resources. In the laboratory, CaCl2∙ZnCl2∙MnCl2/HQZ were prepared by treating bentonite obtained from local raw materials with calcium, zinc, and magnesium salts. Local raw materials are activated by mechanical-thermal and chemical processing and are delivered in the form of dark-colored granules (tablets) up to 5 mm in diameter.

The sorption potential of high-silica zeolite obtained from local raw materials by metal salts and heat treatment was studied, and a technological scheme was developed. A catalyst containing CaCl2∙ZnCl2∙MnCl2/HQZ was developed for drying the obtained high-silica zeolite oil satellite and natural gas from water vapor and purification from sulfur compounds, and its texture and sorption properties were studied. The total amount of SiO2, Ca2+, Zn2+, and Mg2+ ion phases was studied in the radiological analysis of the surface of the catalyst CaCl2∙ZnCl2∙MnCl2/HQZ. According to IR spectroscopy data, surface adsorption of hydrogen sulfide at 25°C occurs in the presence of hydroxyl groups. UZBEKGAZ JSC -Mubarek Gas Processing Plant conducted experimental tests to study the sorption properties of this catalyst, as well as a comparative study of the possibility of sorption of sulfides with the participation of catalysts CaCl2∙ZnCl2∙MnCl2/HQZ and CaA (5A). The tests showed that another experimental test of the selected CaA (5A) compound catalyst was also performed. The absorption of this adsorbent hydrogen sulfide showed that the catalyst CaCl2∙ZnCl2∙MnCl2/HQZ has a total capacity of 8.3% by mass and 14.3% by mass.
About possibility of using natural sources of cold in air conditioning system
Authors: Usmonov N. O. , Umardjanova F. Sh. , Ivanisova A. R.
Published: August 2023

Issues of microclimate mitigation in Uzbekistan during the summer period require urgent resolution. It should be noted that currently, there is very little research and practical recommendations related to the formation of a favorable microclimatic environment in cities with a hot climate. The simplest and most economical way of cooling in dry and hot climates is the evaporative cooling of a dry air stream. One of the possible ways to increase the system's efficiency is the use of night evaporative cooling of water, followed by its accumulation for daytime cooling in heat-insulated batteries. The conducted experiments testify that rather simple and cheap natural sources of cold can be used along with cold machine sources for air conditioning residential buildings in Uzbekistan.
Prediction of disease resistance of high-quality wheat varieties using method of calculating generalized estimates
Authors: Shodiyev Fayzulla , Eshboyev Erkin , Suyarova Aziza
Published: August 2023

The article calculates generalized estimates of the resistance of wheat varieties grown in several regions of the Republic of Uzbekistan to Yellow Rust, Brown Rust, and Flour Dew. In this regard, the classification of wheat varieties according to their resistance to disease, the latency of the features, the calculation of the weight of the features, and the use of these to calculate the generalized estimates were carried out.

As a result, several features played an important role in assessing the disease resistance of wheat varieties, and some did not play a significant role. The article also proves the importance of new features that occur when some features are latent with other features. As a result, representatives of disease-resistant bread wheat varieties with high generalized estimates were identified.
Development of new efficient technology for extraction of fine dust impurities from cotton
Authors: Madaliev M. E. , Navruzov D. P. , Nazarov F. Kh. , Hamrayev Y. Y. , Boltayev S. A. , Abdukhamidov S. K.
Published: August 2023

To date, the problem of creating an effective technology for the extraction of fine dust pollution from cotton has not been solved. This article provides a solution to this problem. The socio-economic significance of the study lies in the fact that the proposed device is associated with significant savings in energy costs for cleaning cotton from dust. After the contaminated cotton enters the threshing floor, under great pressure, fine trash settles firmly inside the cotton. It makes it very difficult to process and clean it in cotton factories. Therefore, the cleaning process of cotton has to be repeated several times. The cost of energy consumed during cleaning increases significantly and the cotton fiber quality is reduced. The device proposed in the article cleans the collected cotton from impurities during machine harvesting. The process of cleaning cotton at this stage is very effective. As a result, the cost of harvested cotton is reduced, which increases the income of cotton farmers and workers employed in cotton factories. In addition, it causes an increase in the quality of textile products. Another socio-economic significance of the device proposed in the article is that it can be installed on a cotton harvester and in other places. In addition, it can be used not only to clean cotton but also to clean other substances from fine dust. As a result of practical research, technology has been developed to extract small contaminants from cotton.
Algorithms and mathematical model for determining shunt power of intelligent track section control sensor
Authors: Aliev Ravshan , Aliev Marat
Published: August 2023

The normal operating state of jointless and butt track circuits depends on the state of change in the insulation resistance; respectively, the correct choice of the maximum and minimum limit resistance characteristics should be considered. The maximum and minimum limit resistance depends on the power consumption of the unlimited track circuit in the normal and the mode of movement of the wheelset at the supply end of the rail line. The article presents a study of an intelligent track circuit without insulated joints, where logical elements replace all the equipment of mechanical and electrical energy converters. The research aims to determine the shunt that affects the definition of the movable block, respectively, the definition of the power of the shunt. The method consists in choosing a sensor, namely an intelligent track control sensor, and developing a mathematical model for determining the shunt power, which provides the influence of the shunt on the track circuit.

Research carried out for track circuits with insulating joints has shown that with the value of the argument, modulus, and synthesis of the maximum-minimum limit resistance when the supply end is shunted, the maximum power will be the least minimum Rkmax. Because of the lack of more accurate data for an intelligent control sensor, studies were carried out.
Improvement of information system of cargo transportation routing management
Authors: Sulyukova L. F. , Akhmedjanova Z. I.
Published: August 2023

The architecture of the information system is proposed in this article, which consists of two subsystems: management of cargo transportation and information flows with centralized management. The tasks and requirements for modern information systems of transport logistics has been analyzed. The task is to find the optimal route plan according to a given criterion for vehicles planning on a directed graph with irregular edge weights, considering the implementation of the delivery concept “right on time”. To consider daily, weekly, and seasonal fluctuations in traffic intensity, the concept of a time layer of the model is introduced. An algorithm for solving the problem of transport routing with load capacity restrictions is developed based on modifying the algorithm of ant colonies.
Development of technology for formation of AI-B-N system joints under influence of high pressures and temperatures to create composite tool material
Authors: Fayzibayev Sherzod , Ignotenko Oleg , Urazbaev Talgat , Mamayev Sherali , Nafasov Jasur
Published: August 2023

Investigation of formation processes and characteristics of Al-B-N system compounds obtained under the influence of high pressures (up to 8 GPa) and temperatures (up to 2000K) to create composite tool materials on their basis. The main scientific idea is that a method will be developed for forming compounds of the Al-B-N system under the action of high pressures and temperatures. The obtained compounds of this system will create the prerequisites for creating composite tool materials on their basis for specific application tasks in the industry.
Improving physical and mechanical properties of bentonite clay from Navbahar clay deposit
Authors: Kuchkorov Lochinbek , Tursunov Nodirjon , Avdeeva Anna
Published: August 2023

Different compositions of mixtures of sand and clay with medium-grade bentonite for molding of critical large parts of a freight car bogie are examined in the article. Different compositions to improve bentonite’s physical and mechanical properties, such as gas permeability and compressive strength with the addition of soda ash, are considered. As a material for the study of sand and clay mixtures were taken quartz sand grade 1K2O2025, medium strength bentonite Navbaharskogo birthplace, and for improving the physical and mechanical properties of bentonite - soda ash. One possible way to increase bentonite's stability at high temperatures is to treat it with sodium-containing powder like soda ash. The treatment is performed by adding soda ash in powder form to dried bentonite. Experimental results are given in the form of tables and diagrams. Experimental studies were carried out in the production conditions of the central plant laboratories at ES “Liteyno-mechanical plant”. The experiments were carried out following the normative documents. The basis of the results was plotted, and the assumed composition of sand and clay mixtures was established.
Modeling of dissipation of vibration energy in problems of structural dynamics
Authors: Miralimov Mirzakhid , Ospanov Ruslan , Mengliev Ismail
Published: August 2023

This paper has proposed a model that reflects a process of energy dissipation in dynamic oscillatory systems. According to the hereditary theory of viscoelasticity, a relationship between stress and strain is realized in an integral form. At the same time, the weakly singular kernel of heredity simultaneously describes both internal friction and deformation of aftereffects (creep and relaxation). Application of the developed model is shown through the description of free and forced vibrations of dissipative mechanical systems. A new opportunity can optimize the damping properties of materials of vibrating structures, which is important in solving the problem of introducing new materials. In mechanics, a new approach was proposed, which consists of the fact that by knowing the rheological parameters of material, one can find the damping coefficients directly without resorting to experiment.
The effect comparative evaluation of energy-saving additives on the bitumen properties
Authors: Riskulov Alimjon , Sidikova Takhira , Khakimov Rovshan , Avliyokulov Jamshed
Published: August 2023

Energy-saving additives used in the Uzbekistan road construction practice are considered. Based on experimental data, the influence of the considered energy-saving additives on the standard, adhesive and rheological properties of petroleum road viscous bitumen has been established.