bluuebunny/crossref_metadata_2025_split huggingface dataset:
Operation damless intake of the Amudarya river (Central Asia)
Authors: Atykbekova F , Uljaev F , Jumaboeva G , Gayur A , Ishankulov Z , Jumanov O 
Published: July 2020

Abstract
The article describes the nature of the ongoing channel processes occurring in large damless water intakes from the Amudarya-Karakum, Karshi, and Amu – Bukhara channels located in its middle course. The characteristic features of the ongoing channel processes in the area of water intake are given. Based on the analysis of the current state of damless water intake, a method for improving its operation is recommended. To solve the problems of ensuring high-quality water intake and water supply, experimental studies were carried out to determine the angle of the bottom threshold in the inlet section of the head structure in the ABMCh. The analysis of the studies showed that for the threshold angles to the shore β = 30°, 45° 60°, an increase in the angle β from 30° to 60° increases the intensity of the artificial transverse circulation formed in the flow. It is proved that this circumstance is also true for a constant angle of threshold β with an increase in the relative threshold height H

rth
. The bottom threshold ensures the entry of bottom sediments into the head structure of the damless water intake. The threshold height is set to 1.44 m, which is determined in comparison with the height of the beds of sediments. To prevent the entry of a large amount of bottom sediment into the head structure of a damless intake, it is recommended that the device be used especially in the inlet section of the channel. It is shown that a Karakum channel is intensively exposed to deigish. Moreover, in this process a certain sequence is traced. First, one deigish is formed, the erosion products of which create favorable conditions for the occurrence of the next deigish. So the chain of deigish “walks” along the shore. The distance between deigish, also a “step,” varies widely: from 3-7 to 15-40 m or more. Then, the remaining protrusions between the deigish are washed out, which leads to a general expansion of the channel. It has been established that deigish appears and develops in both straight and curved sections of the channel. In the latter case, they are formed mainly on the concave bank, although there are cases of their location on the convex. This means that there are corresponding conditions for its formation in both straight and curved sections of the channel. It is substantiated that the formation and intensive development of deigish are associated with the intense channel-forming activity of the flow, which manifests itself both in the process of developing channel forms and in active sediment transport. It is recommended that in order to prevent the deigish process, it is necessary to carry out water management measures aimed at strengthening the channel of the channel. The implementation of concrete cladding using modern materials to reduce losses on filtering the channel in addition to preventing deigish channel and also helps to increase the efficiency of the irrigation channel.
Forms of natural vibrations of a gravitational dam on an elastic foundation, taking into account the attached mass of water
Authors: Bestuzheva A , Kulyabin G 
Published: July 2020

Abstract
Based on the results of the analysis, we have constructed forms of the dam’s vibration forms on different bases, with or without taking into account the reservoir water. The main vibration tone of the 100-meter section of the gravity dam is in the cross direction (along the target) and varies from 0.929 sec to 0.635 sec. depending on the hardness of the base. The main tone of horizontal vibrations varies from 0.687 sec to 0.351 sec. The attached mass of water increases the period of horizontal vibrations of the dam from 0.380 sec to 0.474 sec. Also, we have defined 3 types of vibrations: “pure”, “pure shift”, “invisible form”. We confirmed the need to take into account the water body in solving the contact problem of joint vibrations of the structure with the base and reservoir to obtain real forms of natural vibrations of the structure and improve the accuracy of calculations of seismic resistance of structures in the framework of the linear-spectral theory.
Hydrodynamic pressure upon elements of the shutter with flexible working bodies
Authors: Kadirova M-G 
Published: July 2020

Abstract
For automatic control of the water level in the part of the channel in front of the hydraulic structure, a hydraulic automatic water level controller was proposed. Its main element is a shutter with flexible working elements, consisting of a reservoir formed by a shield for draining water from the channel and flexible cloth. To ensure stable operation without vibration, experimental studies of this shutter with a spillway in the form of a non-vacuum profile were carried out. These studies were carried out by the method of physical modeling of the model and nature in an experimental setup. The aim of the study was to determine the hydrodynamic pressure acting on this shutter, the forces of hydrodynamic pressure, and the centers of application of these forces to the shutter in the form of a non-vacuum profile. Studies have shown positive hydrodynamic pressure on the spillway of the shutter, the absence of vibration, the stability of the shutter. The obtained dependences for determining the forces and centers of application of hydrodynamic pressure forces to the elements of the spillway part of the shutter allow us to calculate this shutter
Simulation of spreading of non-conservative passive substances in water bodies
Authors: Krutov A , Norkulov B , Mavlyanova D 
Published: July 2020

Abstract
Numerical modeling has become an indispensable tool for solving various physical problems. In this context, two fundamentally different approaches to the derivation of equations describing the motion of a liquid and the transfer of both conservative and non-conservative substances that have or do not affect the flow structure. In addition to the classical approach, in which the hydrodynamic equations of the baroclinic fluid are obtained from the Reynolds equations by introducing the assumption that the turbulent viscosity between jets is neglected, there is another approach, which is to introduce a certain scale of consideration, as well as the use of hypotheses about the magnitude of turbulent viscosity and small changes of flow characteristics along with horizontal coordinates as compared with the changes along with vertical one. Thus, there is the option to obtain similar equations allowing to numerically simulating unsteady flows with fixed boundary conditions (fluctuating streams). Also, the article discusses an approach to numerical simulation of biogenic substances as well as the chemical and biological processes in reservoirs.
Advantages of solving the problem of turbine abrasion in the Burjar hydroelectric station by designing a sump
Authors: Badalov A , Kattakulov F , Buvabekov B , Kurbonova U , Abdukhalilov A , Rajabov M 
Published: July 2020

Abstract
Existing methods are considered for designing sedimentation tanks in the Burjar hydroelectric power station to solve the problem of abrasive wear of aggregates. Weighted sediments abrade the lining of derivational and station water conduits, as well as the working elements of hydraulic turbines. In the Burjar hydroelectric power station, there is a problem associated with the abrasive wear of the units. Abrasive wear of turbines leads to a significant drop in their efficiency, and therefore, a decrease in the power and energy generation of a hydroelectric power station, a reduction in the service life of hydroturbine equipment, and a fragment of wear. For the design of the sump, geological and hydrological information was collected about the Burjar hydroelectric power station. The sump is projected onto the derivation channel of the Burjar hydroelectric station. To determine the size of the sump, laboratory analysis of the water of the Burjar hydroelectric station was carried out. The hydraulic calculation of the sump includes determining the main dimensions of the chamber, sediment volume, flushing turbidity, and siltation time of the dead chamber volume with sediment. The calculation is described by the method of academician E.A. Zamarin. According to the method of E.A. Zamarin, the width of the chamber is 9.6 m and the length of the chamber is 73 m. These results are accurate and they were used during the design of the sump.
Calculation of sediment flow in channels taking into account passing and counter wind waves
Authors: Yangiev A , Eshev S , Panjiev Sh , Rakhimov A 
Published: July 2020

Abstract
The article discusses the process of sediment transport in channels under the influence of wind waves on the course. Based on the calculation method Quick M.C. dependences are proposed for calculating sediment transport in channels when waves are superimposed on associated and counter-current flows. The movement of sediments caused by the combined action of waves and currents is studied. It is shown that the direction of the movement of sediments is determined mainly by the direction of wave propagation (even in the case of a counter-current). Here the consumption of sediments is proportional to the power of the “wave flow” system. Comparing the results of the calculation with the dependencies of other authors gives satisfactory results.
A Numerical Model for the Temperature Regime of a Concrete Gravity Dam in the Climatic Conditions of Northern Vietnam
Authors: Aniskin N , Nguyen T 
Published: July 2020

Abstract
One of the main impacts on concrete gravity dams is the temperature factor. The effect of temperature factor on concrete dams will create additional deformation and stress, which can lead to tensile stresses and so gives rise to the thermal cracking. So, forecasting the thermal regime and thermal stress state in concrete gravity dams is a difficult task because taking into account a large number of influencing factors. This paper presents numerical modeling results on the temperature regime of the Banmong (Son La Province, Vietnam) concrete gravity dam with a height of 45m. The model has created by the MIDAS software package and can assess the influence of temperature factors on the dam structure during construction and operation period. The results obtained may be used when designing and making appropriate recommendations.
Technology to restore design parameters of irrigation pump discharge pipelines
Authors: Khudaev I , Muratov O , Turdibekov I , Yusupov M 
Published: July 2020

Abstract
The article discusses the restoration of irrigation pump station discharge pipelines’ design parameters, based on sand-cement anticorrosion shotcrete coating technology. Repair of created cracks, damages during operation, and restoration of design parameters of discharge pipelines is performed using shotcreting with Kalmatron® (USA) additive. Besides, paper theoretically validates optimal design data of restored discharge pipelines, the thickness of the anticorrosion coating, and their influence on working characteristics of irrigation pump stations. Theoretical and applied tasks are resolved based on the practical implementation of foreign technology, local supplies, and the use of the Company’s standards at water facilities throughout Uzbekistan’s irrigation systems developed and implemented by the authors of this article.
Method designing of open drainages
Authors: Fatxulloyev A , Abduraimova D , Otakhonov M , Atakulov D , Samiev L 
Published: July 2020

Abstract
During the construction of open drainages, to achieve economic efficiency, it is very important an accurate assessment of their parameters and projection size. The article is devoted to the creation of a mathematical model by taking into account the variability of flow movement and discharge rate in open drainages. The appearance of a mode of uneven movement as a result of the influx of infiltration water from the sown area to the drainage is described. Recommendations are given for determining the hydraulic parameters of drains. To study the movement of water flow in open drainage, the results of studies in the Boevut drainage system of the Syrdarya region are disclosed. The results of the analysis of the studies are presented. Based on the analysis results, a method for designing open drainages is proposed. The hydraulic parameters of the constructed new open drainage are determined in field conditions. The data determined in the field conditions are compared with the values of the proposed design method. Based on the comparison results, the reliability of the proposed design method was evaluated.
The role of inspection of hydraulic structures in the assessment of their technical condition
Authors: Kozlov D , Yurchenko A 
Published: July 2020

Abstract
The development of the territory of Moscow has led to the need for a survey of water bodies and inventory of existing hydraulic structures, a thorough assessment of their technical condition, typifying the main types of structures, and determining their functional features. To solve these tasks, we used methods of field expedition survey, and analytical calculations of hydraulic structures, statistical methods of information processing, and analysis of available cartographic and technical documentation. A quantitative and qualitative analysis of the state of hydraulic structures located on the territory of New Moscow and their operating conditions was performed; the current level of their safety was assessed. It is proved that it is necessary to create a unified information database for all water bodies and hydraulic structures that have passed the survey, as well as to develop a simplified form of the act of pre-Declaration inspection of structures for which there is no functional and design information. It is shown that it is necessary to develop a plan of measures to ensure the safety of hydraulic structures without registered property rights.
Determination of rational areas of irrigated plots in saline and subjected lands to irrigation erosion
Authors: Avezbayev S , Khuzhakeldiev K , Umarova F , Sharipov S 
Published: July 2020

Abstract
The article considers the issues of determining the rational plots of irrigated plots on lands inhabited and subjected to irrigation erosion. Rational areas of irrigated plots are determined based on the optimal aspect ratio of the irrigated plots, the degree of salinity of soils, the slope of the irrigated surface, and the flow rate of water in irrigated furrows. The optimal combination of irrigators and drains, which are the boundaries of irrigated plots and optimal distances between drains, were also taken into account. Recommended rational areas are defined for slightly, medium, and highly saline, as well as lands subject to irrigation erosion.
Hydromechanical Method of Soil Compaction
Authors: Vafoeva O 
Published: July 2020

Abstract
One of the effective methods for improving the physical and mechanical properties of soils of the foundations of structures is their compaction. The correct implementation of the compaction process significantly increases the bearing capacity of the foundation, evenly distributes the loads from the structures to the foundation, ensuring the stability of the upper and lower prisms of soil dams, reduces water seepage through the body of dams, increases the likelihood of maintaining the structure of compacted soils under the action of dynamic and seismic loads. For soil compaction, static, dynamic, and vibrational methods are used. These methods have a great effect when soil moisture is reached to range within 16 to 18%. Basically, various roller designs are used in soil compaction of earth structures. A review of existing soil compaction machines is given. The disadvantages of the existing soil compaction machines are their massiveness (roller mass up to 40t), the number of passes in one place (three or four), high consumption when watering the soil surface, and waiting for dry-up after watering each soil layer. The article recommends new designs of soil compaction, which eliminates the disadvantages of existing machines, namely: roller is reduced by 50-60%, water consumption is reduced two times, and the number of passes is reduced to one pass.
Mechanized sowing of seeds of desert fodder plants
Authors: Farmonov E , Ismailova Z , Abdilaev T , Farmonova F 
Published: July 2020

Abstract
In the paper, the authors addressed the fact that the continuous improvement of pastures by mechanized sowing and undersowing of local shrubs, sub-shrubs, and perennial grasses is one of the main conditions to maintain the fodder productivity and to combat pasture degradation. This will increase the pasture productivity up to 10 times, compared with natural fodder land. The seeders have been developed with new pick-up drums equipped with measuring grooves, which, during operation, significantly reduce the crushing of seeds, ensure uniform high-quality sowing, do not lead to a decrease in their natural germination. Sowing is carried out following agricultural requirements. The parameters of a pick-up drum with measuring grooves are determined.
Choice of optimum extinguishers parameters for a dissipative mechanical system
Authors: Mirsaidov M , Teshaev M , Ablokulov Sh , Rayimov D 
Published: July 2020

Abstract
This article provides a detailed analysis of the problem of the optimal choice of parameters of dynamic dampers with two degrees of freedom. The choice method is based on calculating the difference between the resonant frequency of the system without absorbers and the nearest resonant frequency of the system with absorbers. The optimal parameters are determined and the effectiveness of many mass-dynamic vibration dampers with various types of viscosity under vibrational impacts is estimated. It has been shown that frequency-independent friction equally affects how viscous friction affects the behavior of the protected structure and damper and its effectiveness. A sufficient condition for damping vibrations in both coordinates is the presence of two dampers for movement, installed at different points. Frequency limits are set to suppress damping simultaneously in the upper and lower surroundings with respect to the resonant frequency of the main system, and also only in the upper neighborhood. It was found that the use of more than two absorbers while maintaining their total mass affects the frequency band in which it is possible to dampen the oscillations of the system.
General characteristics of networks and features of electricity consumers in rural areas
Authors: Rakhmonov I , Berdishev A , Khusanov B , Khaliknazarov U , Utegenov U 
Published: July 2020

Abstract
In addition to the reliability of power supply quality of electricity consumers are one of the most important characteristics of the electrical systems. It has a significant impact on the efficiency of electrical receivers and the technical and economic performance electric networks. In the modern developed networks providing quality indicators of energy acceptable for consumers, requires significant cost of funds and materials, as well as the collection and processing of more information. This explains the importance of the questions of power quality in the complex problem of the design and operation of electrical systems. If the provision in the electrical systems normalized values of the frequency is mainly due to the balance of active capacity and characteristics of the appropriate equipment on the electrical stations, the quality of the voltage at the consumer is determined mainly by cost distribution networks. For consumer’s rural areas referred to the costs are most of the total production costs and electricity transmission, so questions quality assurance voltage networks always were in the focus of research, design, and operational organizations. Particular attention these questions acquire at present in connection with the rapid growth of electricity consumption in agriculture and the relevant development of rural networks. The huge positive effect electrification to fully manifest only when consumers are delivered electricity is quite high quality. Reduction of the quality of significantly impairs performance electrical receivers and leads to marked electro receivers damage.
Development of standard cable cross-sections of rural electrical networks
Authors: Taslimov A , Melikuziev M , Matchonov O , Ruzinazarov M , Nasirov M 
Published: July 2020

Abstract
For the optimal development of electric networks, not only the optimal choice of the network element parameter from the existing standard scale (parametric series) of sizes is important, but also the optimization of standard scales of equipment sizes or checking their optimality. The method of economic intervals explores the existing parametric series of standard cross-sections of 10 kV cable cores and establishes that the existing series does not satisfy the conditions for optimizing the use of cable lines in rural areas. Since cable lines have not yet found wide distribution in rural areas, there are conditions not only to verify the optimality of the existing scale of cable conductor cross-sections but also to establish an optimal scale of 10 kV cable conductor cross-sections, intended for the construction of cable power transmission lines in rural areas (if the existing scale does not meet optimality conditions). For rural distribution electric networks, the initial and final sections in a parametric series (25 and 120 mm2) are determined and the optimal for rural areas parametric series of cable cross-sections of 10 kV (25; 50; 120 mm2) is recommended.
Mobile power supply for drip irrigation systems
Authors: Rajabov A , Bokiev A , Nuralieva N , Sultonov S 
Published: July 2020

Abstract
The widespread introduction of drip irrigation systems in Uzbekistan requires sufficient and guaranteed electricity supply to farms.
The purpose of the research is to substantiate mobile methods of the power supply based on renewable energy sources when implementing drip irrigation systems in the Republic of Uzbekistan. These goals can be achieved by applying modern methods of selecting the optimal design and energy parameters of mobile solar and wind stations. A systematic approach to the analysis of a complex power supply scheme is selected. The main provisions of theoretical electrical engineering and mathematical statistics are used in the study of processes in the power supply system using RES.
The calculations carried out to determine the daily, seasonal and annual schedules of electricity consumption showed that for mobile power supply, it is necessary to take into account such factors as specific modes of work that depend on agricultural requirements and seasonality. A prototype of a mobile power plant “sun-wind” is proposed, which produces 4.5 – 4.7 kWh in the daytime and 0.8-1.0 kWh in the evening.
It is required to develop a system of measures for the implementation of mobile power plants “Sun-wind” providing for the creation of appropriate service, training of service personnel, etc. This, in turn, increases the level of reliability and efficiency of power supply, creates favorable conditions for the widespread introduction of modern resource-saving electrical technologies in remote areas.