Vol. 2 No. 11 (2020)

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.

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.

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 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.

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

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.

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.

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.

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.      

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.