THE ECONOMY OF WATER RESOURCES WITH THE USE OF POLYMER COMPLEXES IN IRRIGATION OF A COTTON

The article deals with the use of polymer complexes in alluvial-meadow soils under the pre-determined humidity of 70-80-65% of the maximum field moisture capacity, in the second option with the 1-2-1 scheme in the Bukhara oasis. During the seedling and flowering phase, one irrigation irrigation norm was performed at 734 m3/ha; during the blooming and fruit cultivation phase, three irrigation operations were performed with irrigation norms of 631-644 m3/ha, one irrigation with a watering rate of 865 m3/ha was performed during the maturation phase. The irrigation norm was 2874 m3/ha or, relative to the control variant, by 1754 m3/ha less, which allowed saving manual water, as well as the results of the conducted experiments and their impact on cotton growth, development and yield.

NEW METHODS OF ACCOUNTING FOR VERTICAL REFRACTION WITH TRIGONOMETRIC LIVELING IN THE CONDITIONS OF THE REPUBLIC OF UZBEKISTAN

In the conditions of Uzbekistan, a simple and ordinary method of refraction is used to determine the relative elevations without vertical refraction coefficient or angle. Described that these methods require a two-sided simultaneous or non-simultaneous geodetic measurements. Working formulas for vertical refraction are presented by calculating vertical gradients in geodetic measurement points.

MODELING OF NONLINEAR VIBRATION PROBLEMS WITH FLUID FLOWS THROUGH PIPELINES

In this paper, mathematical model of nonlinear vibration problems with fluid flows through pipelines have been developed. Using the Bubnov–Galerkin method for the boundary conditions, the resulting nonlinear integro-differential equations with partial derivatives are reduced to solving systems of nonlinear ordinary integro-differential equations with both constant and variable coefficients as functions of time.A system of algebraic equations is obtained according to numerical method for the unknowns. The influence of the singularity of heredity kernels on the vibrations of structures possessing viscoelastic properties is numerically investigated.It was found that the determination of the effect of viscoelastic properties of the construction material on vibrations of the pipeline with a flowing liquid requires applying weakly singular hereditary kernels with an Abel type singularity.

STRAIN CHARACTERISTICS OF SOIL AND METHODS OF THEIR DETERMINATION

The method to define strain characteristics of soil under dynamic loading is proposed based on the results of experiments on dynamic compression of soils on the device for dynamic loading in laboratory conditions; the method allows solving wave problems with the statement similar to the statement of experiments. Using the proposed method, the modulus of dynamic and static compression, the modulus of unloading, the coefficient of viscosity of loess soil in the range of seismic loads are determined in accordance with elastic-visco-plastic model of soil developed by G.M.Lyakhov.

МODERNIZATION TECHNOLOGY REPAIRING ACENTRIFUGAL WATER PUMP

The article provides an overview of the principle of the pump D630-90, as well as methods for studying the real conditions of technical support to improve maintainability and optimize technological processes and systems. A technological process for the restoration of the shaft of a centrifugal water pump has been developed and an algorithm for managing it has been proposed, on the basis of which the system for energy-efficient management of the recovery area has been implemented. Also in the article some questions of use, metal-filled compound SK812, and also application of ultrasonic processing of a surface of a shaft of the centrifugal water pump of mark D630-90 are mentioned and considered. The developed technological process of pump shaft restoration showed that it is characterized by simplicity, it fits well into the production process of repair and can be widely used in repair shops.

EQUIPMENT BASIS OF PERFORMANCE OF RESULTS OF SCIENTIFIC RESEARCH WORKS

The article provides information on modern high-precision digital laboratory instruments obtained within the framework of the BioWat scientific project: The German Federal Republic (BMBF), sponsored by the Ministry of Education and Science, is the“Resources management in the salinized and drought stress-endangered irrigation areas of Central Asia for adapting to climate change” with the aim of improving the material and technical base of the Tashkent Institute of Irrigation Engineers and Agricultural Mechanization.

EFFECT OF MUNGBEAN REPEATED CULTURE ON COTTON VEGETABLES UNDER CONDITIONS OF SOUTHERN ZONE OF KARAKALPAKSTAN

Investigations carried out under conditions of meadow alluvial soils in the southern zone of the Republic of Karakalpakstan have determined the effectiveness of various norms of mineral fertilizers (N160P100K75; N200P140K100 and N240P170K125 kg / ha) applied to cotton grown in the following year after winter wheat and as a secondary crop of mung beet against mineral fertilizers (N30P80K60 kg/ha). When cotton was grown in the following year after winter wheat and the second crop of mung beans, the highest yield of raw cotton was obtained, which was 3.4 t/ha against the background of mineral nutrition N200P140K100 kg / ha. As a result of research, in the system of crop rotation, winter wheat-recurrent cotton culture is scientifically grounded in the effectiveness of the agro technical method of locating the mung beans culture before sowing cotton.

THE ROLE OF EDUCATIONAL DISCIPLINE "METHOD OF TEACHING SPECIAL DISCIPLINE "IN THE PREPARATION OF MASTERS TO SCIENTIFIC AND PEDAGOGICAL ACTIVITY

The training of highly qualified specialists for various sectors of the national economy, as well as the training of pedagogical personnel for higher educational institutions, is the main task of the magistracy. At the decision of this problem the educational disciplines entering into educational process "the Technique of teaching of special disciplines" is of great importance. The methodical preparation of undergraduates is the main component of the scientific and pedagogical activity. The article deals with the masters degree in the specialty “Methods of Teaching Special Subjects” in the preparation of masters for scientific and pedagogical activity in the field of pedagogy, psychology, general professional and special disciplines, on issues of organizational forms and methods of vocational and special disciplines as well as the content, of their educational standards in the magistracy specialtie the content of this subjects has been analyzed and the recommendations ane given to improve its effectiveness.

STUDY OF THE EFFECT OF RELATIVE HUMIDITY ON THE OPERATING MODES OF THE IONIZER

When using electro-ionizers in the conditions of the fruit storage facilities, it is necessary to take into account the influence of environmental conditions of the electrical ionizers. A particularly important factor here is the relative humidity of the air in the storage tanks. At higher values of the relative humidity of air in the atmosphere of the fruit storage, air ion combine with water molecules to form heavy ions, as a result of which the volume concentration of ions decreases. To test these theoretical assumptions, we conducted studies of the operating parameters of the ionizer under condition of storage tanks high relative air humidity. Studies have shown that under conditions of high air humidity the concentration of ion decreases by 10–12% and at a distance of 1 meter from the ionizer, the air ion concentration is 1,6∙1013 ion/m3.

INTERRELATION OF CHEMICAL AND FRACTIONAL STRUCTURES OF RIVER SEDIMENTS

In this article, the mechanical and chemical compositions of river sediments are studied, the analysis of studies on the change in the chemical composition with a change in the mechanical composition of the sediments is presented. The possibility of effective use of sediments based on the interrelation of their mechanical and chemical compositions is substantiated.