This article discusses the use of thyristors and the choice of a circuit in the control of adjustable asynchronous electric motors. The theoretical foundations and practical aspects of using various control schemes for asynchronous electric drives are presented.      

The article discusses the use of hydroelectric power plants in Uzbekistan, ways to improve them and the requirements for modern hydroelectric power plants, the construction of small power plants and their widespread use.

An algorithm is developed for calculating rod systems taking into account the nonlinear work of reinforced concrete. The calculation is based on the nonlinear theory of reinforced concrete.

The article gives linear densities, quantity and direction of twisting, as well as production characteristics of new twisted threads from raw silk. Elastic and plastic indicators, relative breaking loads, breaking elongation of twisted threads obtained from 2,33 and 3,23 tex of raw silk giving 700-800 tw/m from cocoons of the Uzbekistan-5 and China hybrid are given. The principle of operation and technological parameters of the machine for the production of twisted yarn are fully described. The analysis of foreign literature on the subject is studied. A rational twisting interval for weaving fabrics has been determined. A patent has been obtained for the invention of a new yarn assortment production method.

A mathematical model of structures controlling the turbulent flows is considered. The shore spillways are investigated by constructing a free surface. Calculations of transition sections, turns, ramps-turns, scattering ramps in inclined drop structures with water flow rate from several cubic meters per second to several thousand, with a gradient from several degrees to 45° or more, with a constant and variable gradient and width, with straight and curved axes are given.

This article provides basic information on engineering selection and beautification of urban areas to be built in response to emergencies.

This statement is about architectural monuments located in the Hazrati Imam complex, one of the centuries-old architectural monuments in the historical part of Tashkent, and the work done on their restoration and repair during the years of independence.

The purpose of this thesis is the development of optimal technological parameters of processing of composite coatings γ-rays, providing them with high adhesive, strength properties and wear capability, leading to increased efficiency and durability in abrasive conditions.              

The article discusses the features of the development of powerful coal seams prone to spontaneous combustion. The conditions for the development of coal self-ignition processes and ways to combat endogenous fires, most of which occur in the developed space of mines. The increase in the volume of mined-out space and depth of mining operations, as well as the lack of accurate methods for determining the location of fires, reduced the effectiveness of the fight against spontaneous combustion supply of liquid compounds such as water and clay pulp flowing down the soil layer. For the prevention and suppression of foci of spontaneous combustion is increasingly being used as a nitrogen supply which produces a three-dimensional processing of the milled mass and reduces the oxygen concentration in the produced space.

The article discusses the issues of thermal treatment of petals of oil-containing stone fruit crops with infrared rays in order to prepare them for extraction. It has been established that with intermittent infrared heat treatment, the temperature of the material does not rise above 58⁰C,, which contributes to the preservation of all useful substances in the composition of the material: lipids, proteins, vitamins, etc. The moisture content of the material will be within 7%. The penetration of infrared rays deep into the material creates conditions for the destruction of the cell walls of plant material, which creates favorable opportunities for direct extraction.

When seismic tremors happen, energy delivered by the quake gets actuated into the structure as ground movement and this energy must be disseminated for wellbeing reasons. To deliver seismic energy, the structure should harm so that on one hand, breakdown of structure ought not happen and then again, after the tremor, harm should be financially practical to fix. To dodge the breakdown of the structures and furthermore to decrease the fix cost after the tremor, most plan codes center around giving adequate pliability to structure. Scattering of huge portion of infused seismic energy is a significant factor for a structure to be seismically resistant.In this commitment, utilization of metallic-fiber to improve the conduct of fortified solid bars exposed to cyclic stacking is explored. RC radiates containing metallic strands of two distinct sorts in mono and half breed structures were developed and tried under converse cyclic stacking to explore the chance of getting pliable and energy dispersing RC pillars to be utilized in seismically dynamic zone.

To ensure the performance of the main function of the car - the transportation of goods and passengers, it is necessary to increase the reliability of vehicles. On newly developed car models, they are additionally beginning to install completely non-traditional on-board automatic systems, which include: driver information system with microprocessor support; satellite navigation and search system; radar and ultrasonic systems for car protection from collisions and theft; systems for increasing the safety and comfort of people in the cabin; cruise control system; electronic card system; multiplex electrical wiring.

This article analyzes the main problems and solutions to the preheating of raw materials with the help of off-gases during melting in electric arc furnaces (EAF). The analysis of the available developments in this direction and the ways of introducing this process into the EAF of the electric steel-making shop of JSC “Uzmetkombinat” was carried out. Features come from a number of parameters and criteria of raw materials, the composition of the charge and the technology implementation during the melting period.

The metal marking specified in the article meets the standards of the CIS state.

Currently, the most commonly used process in metalworking is cold stamping of metals. This process involves the production of a large number of parts per unit of time and minimal consumption. The topic covered in the process is dedicated to improving the accuracy of stamps.

This article examines the dimensional annealing process of X12Ф1 grade steel. Due to the high content of carbide phase in the steel grade X12Ф1, its mechanical strength is lower. Therefore, X12Ф1 steel is used for the manufacture of tools that are less important, but simpler in construction. Therefore, the introduction of the optimal option of annealing methods in the heat treatment of steel grade X12 allows to obtain tools of complex shape from this type of steel.

Synchronous motors used by the technological process in the production of industrial enterprises are considered to be the organ of mechanical drives of pipe compressors. When high-voltage, high-power motors are excited by the automatic control method, the setting nominal excitation current is maintained, and when such equipment is operated, a high energy saving is achieved.

Such problems are the problems of the quarry and the demand for production. When solving these problems, the replacement of inefficient tristor excitatory devices with effective microprocessor exciters is set forth in the report of the master's thesis.

The article presents the conditions for the study of negative friction forces in the laboratory, experimental setup, measuring equipment and soil characteristics, experiments and analysis of the results.

This article presents the results of experimental studies of cubic, prismatic strength, elastic and plastic deformations, as well as deformations of thermal expansion of conventional heavy concrete and heat-resistant concrete on alumina cement when heated.

The article is devoted to testштп the hardness of textile materials. To analyze and study samples were taken from various tissues of the linear density of the yarn and also with different type of fabric weave and density. To study the rigidity of textile materials the appliance is made and certain hardness of the test samples. On based of the results of the samples and methods for determining the stiffness can be concluded that stiffness is one of the basic properties of textile materials for garment production.

The article presents the theoretical and practical research results on many female's outer knitwear models collections development made from polycomponent raw materials.

This article examines the influence of changes in microclimate parameters on human well-being, as well as on the building structures of buildings, analyzes microclimatic parameters and factors affecting the internal environment, provides normative indicators and sanitary standards. Conditions have been identified that negatively and positively affect the human body, and the influence of microclimate parameters on the elements of building structures and the building as a whole has been demonstrated. Based on the analysis, the need to maintain the microclimate of residential and public premises within the normal range was demonstrated.

The article provides a literary review on the design of the saw gin roll box and the regulation of the density of the seed roll. On the basis of the studied, a new design of the roll box of the saw gin is proposed, which will ensure a uniform supply of cotton depending on the density of the seed roll.

Based on the development of the Dzheroy-Sardarinsky reservoir Deposit of granular phosphorites, technological features of the use of horizontal milling combines of various types and manufacturers are revealed. The selective development and implementation of the scheme of mining operations, which allows to increase production efficiency by intensifying the use of mining and transport equipment, is justified. The areas of application of the developed schemes are determined taking into account the mining and geological conditions of the field development and the design and technical parameters of the equipment used.

The article considers the influence of water-soluble salts on the thermophysical state of building envelopes. At various concentrations of salts, the protection of enclosing structures against changes in sorption and vapor permeability by damping was established.

The development of the electric power industry and electrical machine building is associated with the use of a wide range of electrical insulating materials. The intensive development of science and technology requires the complication and improvement of the conditions set for electrical insulation. Based on the above, in order to increase the operating time of all oil electrical equipment working in the power system and have detailed information about the transformer oils to be poured and the requirements for them. The main task is to determine the requirements of standards for electrical insulating materials and compliance with technical conditions and it is advised to check by testing on the basis of regulatory documents of the quality indicators filled in them and to maintain constant control of oil equipment during operation.

In the article, sticky speeder has proposed to the beyond of roll box as the improving the work effectiveness of gin stand. Proposed score has been practiced at the 30 saw gin stand. The effectiveness of the speeder to the production of the seed roller and the fiber’s quality indicator which is before and after the practice, research results at the laboratory have been shown in the article.

The following article demonstrates how digitalization processes are applied in order to develop tourism with full potential. Also, the hybrid concept of digital entrepreneurship and its role within the transformation of the innovation

System is investigated. Furthermore, identification of key categories of digital entrepreneurship and also its differentiation from other types of business activities is differentiated.

This article discusses the laws of propagation of light rays from various sources of optical radiation in
the aquatic environment, spectral characteristics and the results of scientific research on their
application in the fishing industry, in particular in lighting devices for fishing. It was shown that a
change in the spectral photosensitivity of semiconductor white light Light-emitting diodes (LED)s
provides practical assistance to the growth of functional systems of fish and their larvae,
reproduction and development of aquatic plants, bacteria, detritus and benthos.

Currently, the main source of feedstock for the production of lower olefins is oil. The implementation of the sequential change "CH4 → CH3OH → lower olefins" allows us to consider natural gas as an alternative raw material for the production of expensive raw materials for petrochemicals-ethylene and propylene. The most promising catalysts for converting methanol to olefins are crystalline microporous silicoaluminophosphates (SAPO-34 and SAPO-18) With a chabazite structure and high siliceous zeolites (HSZ) synthesized from kaolin. Despite the existence of industrial processes for converting methanol using HSZ to olefins, the improvement of these catalysts is an urgent task in order to increase the selectivity and stability of the operation of ethylene and propylene. Therefore, we conducted the process of producing ethylene and propylene from methanol by incorporating metals of various nature from natural kaolin to HSZ. The purpose of this work is to study the effect of the nature and amount of the introduced metal on the physicochemical and catalytic properties of the HSZ.

In this article, one of the best local products, Terry describes the general characteristics, properties, names, and classifications of the products and products, and classifies them to summarize and customize the characteristics of today's products and products. The classification is based on specific products.

The article is devoted to specific issues of interaction between industrial and social ecology, analysis and assessment of natural and socialrelations as a single natural-territorial ecosystem. Based on the international practice of managing the environmental situation in large industrial cities, the issues of planning construction works and improving the environment in large cities are considered.

The article presents a diagram of the recommended design of a safety harness with an additional shock absorber. The principle of operation of the safety device is given. A method is proposed for calculating the tension of the harness sling. Using the balance of forces, a formula is derived to determine the tension of the sling. Graphical dependences of the change in the tension of the sling on the change in the coefficient of stiffness of the shock absorbers and on the force of the worker’s weight at different angles of inclination of the sling to the horizontal axis are constructed, the main parameters of the safety belt are substantiated.