bluuebunny/crossref_metadata_2025_split huggingface dataset:
Criteria for the existence of established modes of power systems
Authors: Davirov A , Tursunov O , Kodirov D , Rakhmankulova B , Khodjimukhamedova Sh , Choriev R , Baratov D , Tursunov A 
Published: December 2020

Abstract
This article considers the criteria for the existence of established modes of power systems. Nonlinear nodal equations of steady-state modes are presented, which have many solutions or do not have any physically realizable solutions. Criteria for the existence of solutions are given based on derivatives of power losses depending on the parameters of the power system modes. Equivalent circuit of the electrical system was performed using the South-Western MEN (MAIN ELECTRIC NETWORKS). The paper highlights the results of calculations of steady-state modes of the electrical system at weighted values of node 12. The maximum normal modes of electrical systems for the power of nodes was determined by the criteria are set

∂
Δ

P

c

∂

Π

i

=
∞

.
Features of streamer form of corona discharge in respect to electric gas purification
Authors: Muzafarov Sh M , Tursunov O , Kodirov D , Togaev B K , Balitskiy V E , Babayev A G , Kilichov O G , Nasibov B R , Allenova I V 
Published: December 2020

Abstract
An article briefly describes advantages of streamer form of corona discharge over corona discharge of direct voltage. With the purpose of confirmation of hypotheses about possibility of stabilization of discharge processes in electric fields of streamer form of corona discharge oscillography voltage and current were done, and volt amperage features at various frequencies of pulse voltage were taken. Impact of parameters of electrodes system «Potential plane with corona needles – grounded plane» to value of discharge current was studied. Outcomes of study of power features and character of change in strength of electric fields of streamer form of corona discharge are presented.
Unsteady vibrations of a three-layer plate with an asymmetric structure
Authors: Khudoynazarov Kh , Khudoyberdiyev Z B 
Published: December 2020

Abstract
This article discusses the problem of symmetric vibrations of a three-layer plate pivotally supported along the edges in the longitudinal direction is solved. The materials of the plate layers are assumed to be elastic and isotropic. It is believed that the plate is not symmetrical in thickness, i.e. different thicknesses of layers. A brief review of scientific papers on theories of calculation of three-layer and multilayer plates is given. The equations of vibration of a three-layer plate, previously developed by the authors, are accepted as resolving equations. The stress and displacement components are expressed, as well as the oscillation equations, through the main parts of the longitudinal and transverse displacements of the points of the “intermediate” plane of the middle layer, which is at some distance from the middle plane of the plate. The conditions of the articulated plumage are formulated with respect to the displacements of the points of the middle layer. The initial conditions are assumed to be zero. The formulated problem is solved by an analytical-numerical method using a software package. The obtained numerical results are presented in the form of graphs of the dependences on time and the longitudinal coordinate of the displacements and voltages of the points, both the middle and the bearing layers of the plate. The calculations were performed for steel materials of the bearing layers, and for the middle layer the physic-mechanical parameters of the polymer material were adopted. The corresponding conclusions are made according to the results of numerical calculations. It was established that slight transverse displacements of the plate points appear due to the action of longitudinal external loads. Moreover, due to the insignificance of these displacements with symmetric vibrations of a three-layer plate, transverse displacements can be neglected. With symmetrical vibrations of the plate, longitudinal normal voltages are also excited despite the fact that the edges of the plate are free of external loads. These voltages are generated by the action of external tangential and normal voltages on the boundary surfaces.
Selection of Optimum Structural System in the Design of Reinforced Concrete High-Rise Building under the Effect of Seismic Load
Authors: Aryan M Z , Singh P , Zabihullah  
Published: December 2020

Abstract
Due to the infrequency of spaces in megacities, it is highly required to construct high rise buildings. In high rise buildings, the effect of seismic lateral forces is significant to be studied. The stiffness of lateral force-resisting elements of the building should be enough to stay safe during an earthquake. Providing the required stiffness by only enlarging the size of columns will cause congestion in space. Shear wall and/or bracing positioned at a lucrative location in frame, contribute to the structure and serve as lateral load resisting systems. Hence, Optimization for the selection of proper structural systems is vital in the structural engineering profession. This study deals to investigate the consequences of the shear wall and RC bracing on the reduction of earthquake lateral forces in the building. Including a moment-resisting frame, nine models of G+14 Storeys RC building with various structural systems and configurations are analysed and compared using Response Spectrum Method, as per IS 1893 (part 1); 2016. The comparison among all the models is carried out based on the storey displacement, base shear, storey drift, fundamental period, storey stiffness, force demand, and modal period. Based on the comparison of all building models with various configuration, it was found that out of all models, the model M-1 (moment-resisting frame) is not desirable, while the model M-5 (shear wall at the corners of the periphery) will have an upmost seismic performance and the model M-8 (bracing at the middle of the periphery) has indicated better execution during an earthquake. Abbreviations: IS, Indian Standard; G+14, Ground plus Fourteen; RC, Reinforced Concrete; M-1, Model-1; M-2, Model-2; M-3, Model-3; M-4, Model-4; M-5, Model-5; M-6, Model-6; M-7, Model-7; M-8, Model-8; M-9, Model-9, DL, Dead Load; LL, Live Load; EQX, Earthquake Static Load in X-direction; EQY, Earthquake Static Load in Y-direction; RSX, Response Spectrum Load in X-direction; RSY, Response Spectrum Load in Y-direction, (X) Modes of Oscillation in X-Direction, (Y) Modes of Oscillation in Y-Direction, (T) Torsion.
Using Ceramic Wastes in Stabilization and Improving Soil Structures: A Review Study
Authors: Iravanian A , Saber S A 
Published: December 2020

Abstract
The goal of this review study is to define the use of ceramic wastes as a raw material in soil structures and the construction of road pavement subgrades. The global output of ceramic waste powder (CWP) produced during the final polishing phase of ceramic tiles exceeds 22 billion tones. The application of (CWP) in landfill sites could create major environmental issues for soil, water and climate. It has been calculated that about 30% of the daily growth in the ceramic industry goes to waste. By trying to reduce this material, we can provide a big benefit of minimizing the use of natural products, decreasing the amount of money used and enhancing land conditions, based on the quantities we can use. Such wastes cannot be processed in any manner and thus create issues with the disposal and loss to the industry. Ceramic waste is strong, durable and resistant to all kind of declining powers, and these properties allow it to be substitute for replacements. Using various quantities of ceramic waste, we will obtain different results and characteristics of soil structures in different California bearing ratios, dry unit weight, unconfined soil density and optimum water content.
Distribution of contact voltages in asymmetric two-roll module
Authors: Khurramov Sh R , Kurbanova F Z 
Published: December 2020

Abstract
Mathematical models of the regularities of the distribution of contact stresses in the generalized two-roll module in the case when the nature of the deformation of the material layer is specified by rheological models are obtained. New data on the regularities of the distribution of contact stresses are revealed: normal contact stresses change from zero at the beginning and at the end of the contact zone of the rolls to a maximum at a point lying to the left of the center line (towards the beginning of the contact of the rolls); the tangential contact stresses change their signs at the neutral point, which in the driven roll is located towards the entrance of the material layer into the contact zone of the rolls, and in the free one - towards the exit; during static interaction of the rolls with the material being processed, the point of maximum normal stresses and the neutral point are located on the center line.
The reservoirs capacity assessment: the Tuyamuyun hydro complex in Khorezm region of Uzbekistan
Authors: Ikramova M , Akhmedkhodjaeva I , Khodjiev A 
Published: December 2020

Abstract
The dynamic processes in water reservoirs depend on its morphological characteristics, i.e. bottom geology and relief, flow depth, intensity of water exchange, water and sediment features etc. The paper presents a capacity assessment of the Channel Reservoir of the Tyuyamuyun Hydro Complex located in Khorezm region of the Republic of Uzbekistan based on GIS tools. The study was aimed at determining of sedimentation dynamics of the Channel Reservoir during over 35 years dam operation and changes in the water storage capacity. The ongoing channel processes lead to regular reformation of the reservoir morphology. The data obtained allow determining the morphology of the reservoir, useful water volume, the capacity loss etc. and solving other issues related to management of water resources. The GIS technologies allows regular monitoring of the changes in capacity, make a prediction of future sedimentation processes, as well identify the stagnant water areas and volumes to be released to downstream for using in agriculture.
Kinematic analysis of tooth-lever differential transmission mechanisms
Authors: Bahadirov G A , Sultanov T Z , Abdukarimov A 
Published: December 2020

Abstract
This paper refers to a problem of application of tooth-lever differential transmission mechanisms in roller technological machines with variable inter-axial distance of working shafts, which are widely used in civil and agricultural engineering. Shortcomings of tooth-lever differential transmission mechanisms, used in roller machines, were shown; they are expressed in discrepancy of kinematic characteristics of these mechanisms to technological requirements of different types of roller machines. An arrangement and a principle of operation of new tooth-lever differential transmission mechanisms, developed by the authors, are briefly considered here. The possibilities of application of offered transmission mechanisms in six principal schemes of roller machines are described. Formulas are drawn to determine kinematic parameters of one of new transmission mechanisms depending on geometric and kinematic parameters of two-roller modulus, processed material and transmission mechanisms itself.
Mathematical modeling parametric vibrations of the pipeline with pulsating fluid flow
Authors: Khudayarov B A , Turaev F Zh 
Published: December 2020

Abstract
A mathematical model of the dynamics of a straight viscoelastic pipe conveying pulsating fluid has been developed in the paper. Using the Bubnov-Galerkin method, a mathematical model of the problem is reduced to solving a system of ordinary integro-differential equations, where time is an independent variable. Solution of integro-differential equations is determined by a numerical method based on the elimination of a singularity in the relaxation kernel of an integral operator. A system of algebraic equations is obtained according to the numerical method for unknowns. To solve the system of algebraic equations, the Gauss method is used. A computational algorithm is developed for solving the problems of the dynamics of viscoelastic pipelines conveying fluid.
Automatic decision-making system for the desalinization of water for irrigation
Authors: Gaziyeva R , Ozodov E , Bozorov E , Nigmatov A 
Published: December 2020

Abstract
The high salinity of water negatively affects soil fertility up to yield loss. In regions with high salinity, unorthodox methods and devices are used to lower the level of mineralization. This article discusses the use of an automatic decision-making system for a device to lower the level of mineralization by diffusion mixing. Construction able to filter water to irrigation rates up to 3 grams per liter and extent the operating period of reverse osmosis. The article provides a detailed description algorithm of a program for automatic control of the water purification process based on the Atmega 328 processor.
Methodology for conducting an optimization experiment for harvesting dry short-stalked grain crops
Authors: Bayzakova J S , Abdildin N K , Shynybay Zh S , Chingenzhinova Zh S , Berdyshev A S , Eshpulatov N M , Matchonov O Q , Yusupov Sh B 
Published: December 2020

Abstract
The article raises the issue of climate warming without loss of harvesting dry short-stalked crops will increase, and requires an urgent technological and technical solution. Research aimed at the development of a device installed in an inclined chamber, providing a reduction in grain losses during harvesting of dry short-stalked grain mass, is relevant and of great economic importance. The aim of the study was to increase the efficiency of harvesting dry short-stalked crops due to the uniform distribution of threshed grain mass supplied to the combine harvester. And the scientific hypothesis of the study was to increase the efficiency of a single-drum combine harvester by threshing dry short-stalked breads, by ensuring a uniform layer of grain mass entering the local government. The results showed that the threshing of grain increases due to the uniform distribution of mass depending on the length of the discrete part of the corrugation. The results of the experiment are obtained.
Study on possibilities of scarring ways to reduce in the cotton cleaning process
Authors: Mukhametshina E T , Jamolov A , Muradov R M 
Published: December 2020

Abstract
This article provides a diagram of the technological process of cotton primary processing plants. It also shows which of the machines installed in the technological process can damage the seed, as well as the operation of the machine and the main working bodies, which separate the fine contaminants in the cotton. It is theoretically based on the fact that cotton ginning machines can reduce the impact force by improving the design of the working bodies. A device that has been proposed allows cotton to be cleaned from fine contaminants using a vibrating mesh surface without affecting its natural properties. In order to improve the technology of cleaning cotton from fine contaminants, an effective scheme of pile drum and mesh surface construction has been developed. With the help of a sloping mesh surface device, the existing impurities in the cotton were reduced by 0.2%. The graph of the formation of various defects in the fiber content as a result of seed damage during cotton cleaning is given.
Environmentally friendly technology for the destruction of tobacco mosaic viruses (TMV) from selected species of plants
Authors: Toshpulatov N , Tursunov O , Kodirov D , Kholmuratova G 
Published: December 2020

Abstract
The article provides information on diseases of plants of melons and gourds of tomato, and cucumber. The analysis was carried out to identify the current state of the problem of infection and morbidity of tomato and cucumber plants with tobacco mosaic viruses (TMV). The positive and negative aspects of existing methods and methods of combating pathogens are described. The structure of the pathogen, the structure of cells in a spiral for the purpose of their destruction and elimination of harmful effects were studied. The description of the use of electric current discharges on the possibility of using TMV for breaking the cell spiral with the aim of destroying them is given.
Productive qualities of Swiss cows depending on the genotype of bulls
Authors: Ashirov M I , Ashirov B M , Bakhriddinov F B , Khaidarov K R 
Published: December 2020

Abstract
This study highlights the use of European breeding bulls in the selection of breeding stock of Swiss cattle in Uzbekistan in order to improve the productive qualities of cows and create highly productive families. In experimental herds, milk yields of mature cows exceed the requirements of the breed standard by 935 - 1219.4 kg, the ancestors of families are 1627 - 1816 kg higher than the requirements of the breed standard, which indicates their high genetic potential.
Study on drip irrigation system as the best solution for irrigated agriculture
Authors: Gulomov S B , Sherov A G 
Published: December 2020

Abstract
This article analyzes the current research on drip irrigation for the efficient use of water resources caused by increasing global warming, examines their various designs, advantages, disadvantages, and low-pressure drops created at the Tashkent Institute of Irrigation and Mechanization Engineers. Irrigation method was applied on apple sort of “golden” in the meadow gray soils of the Tashkent region according to the mechanical composition of sandy loam soils. With the use of an apple orchard, water savings and high productivity have been achieved.
Nitrogen fund of the Chyrchik river basin’s dark serozems and its fractive structure
Authors: Bairov A J , Nuriddinova Kh T , Juraev Sh A 
Published: December 2020

Abstract
In this article, the information on the high-grade exposition of the amounts of mineral, easily goulizable, difficult goulizable and non-goulizable compounds of the dark serozems of the Chirchik River Basin of the Tashkent region, as well as changes in the effect of their use in viticulture is presented. These data serve to develop ways of effective and rational management of the Nitrogen Fund of the soils studied.
Justification parameters of mechanized dryer unit
Authors: Umarov G G , Buronov Sh E , Amonov M O 
Published: December 2020

Abstract
This article presents an analysis of the creation of a unit for drying stem agricultural crops and justification of its main parameters, which is aimed at growing large and high-quality products through this process. The purpose of creating such unit and justification of its parameters was that during drying, products were dried unevenly, resulting in some parts of the product were dried more than necessary, and some areas rotted without complete drying. Therefore, the shape of unit for drying products must be such that the product simultaneously dries. Based on theoretical and experimental studies on this criterion, was developed a nomogram, the shape and parameters of the dryer device were theoretically analyzed by using analytical dependencies
Adsorption mechanisms for heavy metal removal using low cost adsorbents: A review
Authors: Ugwu E I , Tursunov O , Kodirov D , Shaker L M , Al-Amiery A A , Yangibaeva I , Shavkarov F 
Published: December 2020

Abstract
A review of adsorption mechanisms for heavy metal removal using low cost adsorpthas been carried out in this article. Some metal ion sequestration techniques used over the years have some demerits, ranging from generation of sludge to high operational cost. Adsorption process using low cost adsorbents has been found cost effective and environmentally nuisance-free. In this review, various low cost adsorbents for heavy metal sequestration have been studied. The application of some adsorption models such as single and multi-component isotherms, adsorption thermodynamics, and kinetics as well as the effect of process parameters on heavy metal sequestration using low cost adsorbents has also been reviewed so as to better understand the adsorption process. From the literature reviewed, the percentage removal of chromium, copper and zinc was favoured by an increase in contact time, temperature, initial concentration, adsorbent dosage as well as a decrease in pH.
Exploration of tillage technologies in the Republic of Uzbekistan
Authors: Umurzakov U , Mamatov F , Aldoshin N , Mirzaev B 
Published: December 2020

Abstract
The aim of the study is to analyze soil cultivation technologies and development trends of tillage machines in the Republic of Uzbekistan. The prospects of using dump and non-dump soil tillage are shown. Existing basic processing technologies are presented. The advantages and disadvantages of traditional technologies and plows for primary tillage are analyzed. The advantages of the new technology of smooth plowing and frontal plows for its implementation are given. The expediency of developing and implementing combined machines that carry out various technological processes in one pass of the unit and special-purpose plows for working in gardens and on slopes based on frontal plows is substantiated. The perspectives of the application of technologies and tools for anti-erosion and land reclamation cultivation, phytomeliorative works based on minimal narrow-band soil cultivation and sowing are shown. Directions of developments in the field of mechanization of tillage in the future are given.
Relief, physico-mechanical and technological properties of soil in the cotton growing area
Authors: Mamatov F , Mirzaev B , Tursunov O , Ochilov S , Chorieva D 
Published: December 2020

AbstractThe aim of the study is to study and analyze the physical, mechanical and technological properties of the soil of the cotton growing zone. The results of determining the relief of cotton fields, physical, mechanical and technological properties of takyr soils and gray soils, and the most common in areas of cotton cultivation are presented. It was found that before plowing, cotton fields have a pronounced uneven relief, characterized by the presence of ridges and irrigation furrows. The average height of the ridges in fields with row spacing of 90 and 60 cm is 17.1 and 12.8 cm, respectively. The physical-mechanical and technological properties of the soil of the arable and sub-arable layer of a cotton field along the track of wheels differ significantly from the soil between rows without a track of wheels and a ridge: the density of the soil along the track of the wheels of light gray soils reaches 1.78 g/cm3, and of takyr soils - 1.51 g/cm3, which is respectively more than the density of the ridge soil by 0.24 and 0.16 g/cm3; the resistance of light gray soils to shear is 1.4 and 1.2 times greater than to rupture and torsion, and takyr soils - 1.33 and 1.15 times, respectively; density, hardness and resistance of the soil to various deformations has a maximum value in layers of 15-25 cm along the track of the tractor wheels.
Movement of discrete materials under the influence of a pulsed electromagnetic field
Authors: Mironov V , Jakushevich V , Usherenko Y 
Published: December 2020

Abstract
The article considers the phenomenon of accelerated movement of small-sized objects in a pulsed electromagnetic field. For experimental studies capacitor-type pulsed current generators were used. The experiments were carried out on metal powders with a size of 50-200 microns and compact metal fragments with a weight of 1-50 g. The influence of mass, electrical conductivity and magnetic permeability of the particle material on the process of particle movement was established.
Structure and thermal diffusivity of SiC-NbC ceramics
Authors: Shabanov Sh Sh , Kardashova G D 
Published: December 2020

Abstract
The structure and thermal diffusivity of SiC - NbC ceramic materials are investigated. It is shown that with a change in the composition in sintered ceramics, the lattice parameter changes, and also in the near-contact region there is a mutual diffusion of silicon and niobium. This indicates the formation of solid solutions. As the niobium carbide content and temperature increase, the thermal diffusivity of SiC - NbC ceramic materials decreases.