Vol. 3 No. 03 (2021)

In this article, the root system of plants is shown, which performs a multifaceted function not only by the organs of absorption but also the synthesis of many vital plant compounds of nutrients. Studies under the conditions of lysimetric experiments have established that, regardless of the methods of watering, plants hatched without nitrogen with phosphorus-potassium nutrition are characterized by a significantly lower content of nutrients in the tissues.

The article provides brief information on the procedure and methods of using digital technologies in determining administrative-territorial boundaries, as well as on the process of processing the results obtained using digital technologies, geodetic measuring instruments using special computer programs and cartographic methods of digital administrative control.

This article a new brand 280X29NL (sample 1) alloy, which is economically inexpensive and corrosive, was developed without changing the chemical composition of high-chromium 280X29NL cast iron and reducing the mechanical properties of the alloy.

This article, studying the experience of international mountain tourism development, applies to Uzbekistan and develops important areas for further development of modern mountain tourism.

This article examines the history of the formation of cultural and educational centers, its social nature and architectural solutions. The volumetric plan of the structure of the cultural and educational building, its composition, opinions about the components of the building are given.

Development of the chemical composition of the charge on the basis of alloying elements for the production of stable structural high chromium cast iron and high friction of CEMCO and BARMAK crushers operating under the influence of centrifugal forces and spare parts for corrosion-resistant pumps at Navoi NMEP the issues of casting rotors operating under severe conditions were considered.

The analysis shows that it is proposed to use heat treatment and a number of similar methods to increase the service life of the product obtained by casting in the conditions of the enterprise “NMEP” of Navoi NMMP.

The following article shows that the following article will improve the use of complex atlases in terms of classification and the data on the formation and implementation of corruption data.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. The following article looks into the chemical balancing and factors affecting it.

Based on the analysis of information sources, the characteristics and characteristics of the catalpa plant are estimated. The features of their cultivation are established. The directions of using catalpa seeds for the needs of food and pharmaceutical production are determined.

Analytical and experimental studies have determined the rational design and aerodynamic parameters of the separating pipeline for the delivery of raw cotton from the harvesting machines to the hopper of the machine. A laboratory setup and methodology for conducting laboratory tests have been developed.

This article analyzes the increasing demand for DC electric drives with the development of manufacturing and the emergence of new technologies. Modern technological processes require the development of electric drives that have increased speed, accuracy and the ability to quickly adapt to changing operating modes. The transition process, in a standard system, meets the requirements of optimal quality indicators corresponding to the third point of adjustment. In a system with a fuzzy controller, a transient process similar to that calculated in a standard three-circuit system is obtained. This fact indicates that the use of a fuzzy controller allows you to provide control that meets the required optimality criteria. In relation to the studied SPP ACS, the current loop and the mechanical part of the electric drive in the standard structure (thyristor converter and the armature circuit of the electric motor) should be considered as the control object. To eliminate the influence of EMF feedback, a compensatory positive feedback is introduced into the system.

Recently, new non - traditional management methods, including fuzzy logic, neural networks, expert systems and other control tools with elements of artificial intelligence, have been applied in the world practice.

The dynamics of an electric drive with a fuzzy controller is analyzed. The structure and knowledge base of the fuzzy controller are proposed to reduce the number of control loops and the number of sensors by eliminating the speed loop. Analysis of the dynamics of the two-circuit automatic control system of a tracking electric drive with a fuzzy controller has established that the quality indicators of the dynamics of the electric drive when working out large control actions are better in a system with a fuzzy controller.

The article discusses the physical processes, the related temperature dependencies of conductivity and the Zeebek coefficient in granular silicon and the influence of alkali metal atoms on them at a temperature of 300 K to 800 K. that the conductivity and Zebeck coefficient do not depend only on temperature, it depends on the crystal structure at the boundary of the two contacting regions, and the development of recombination centers in them with an increase in temperature. In the process of temperature growth, desorption of alkali metal atoms is observed, which leads to structural inhomogeneities of crystal lattices at the border of two contacting regions and at the same time increase in structural heterogeneity of crystal lattices of the desorption layer of alkali metal atoms, lead to electron scattering, which leads to a change in sign.

A self-contained receiver based on AFS-film (film with abnormal photovoltage) is described, which is hermetically sealed with a reflective hemispherical cover. X-ray or ultraviolet radiation, passing through the photosensitive layer and being reflected from the substrate, falls on the integrating cavity, that is, on the lid, then, reflected from the lid, again falls on the photosensitive layer. In this case, the efficiency of the APV film increases to 50%.

The reliability of the control system for electric rolling stock is considered using probabilities without failure of the power traction transformer of a controlled rectifier, an autonomous inverter and a traction asynchronous electric motor presented in the form of blocks, in which the failure of the entire system, which in the theory of reliability is called a series connection of elements.

An example is given of determining the probability of normal operation of an object using the method of obtaining moments from the characteristics of blocks and a given function by sequentially calculating the mathematical expectation, standard deviation, third and fourth central moments with their expansion in a Taylor series. The probabilities of not exceeding the specified values are estimated under the assumption that the characteristics of individual blocks are independent.