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2020

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Articles 1291 - 1320 of 1829

Full-Text Articles in Civil and Environmental Engineering

Apple Orchard Drip Irrigation Conditions Of The Tashkent Region Of Uzbekistan, Sardor Gulyamov, Bakir Serikbaev, Anvar Sherov Mar 2020

Apple Orchard Drip Irrigation Conditions Of The Tashkent Region Of Uzbekistan, Sardor Gulyamov, Bakir Serikbaev, Anvar Sherov

Irrigation and Melioration

The article presents the results of many years of theoretical experimental field research on drip irrigation of the apple orchard of the Golden variety in the conditions of the Tashkent region. Based on the analysis of climatic, soil, hydrogeological, geological, hydrological and economic conditions of the experimental plot, as well as biological features of the garden, the values of total water consumption, water consumption deficit, irrigation, irrigation rate and the number of irrigation by the bioclimatic method are determined.

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Calculation Of The Placement Of Vertical Drainage Wells Near An Open Water Source In The Conditions Of Waterlogging Of Built-Up Areas, B.K. Saliev Mar 2020

Calculation Of The Placement Of Vertical Drainage Wells Near An Open Water Source In The Conditions Of Waterlogging Of Built-Up Areas, B.K. Saliev

Irrigation and Melioration

The article discusses the methodology for calculating the intercepting drainage well that reveals the upper layer of the multilayer horizon, and presents analytical dependencies based on the hydrodynamic theory and formulas for approximate calculation of the location of the axial line of the blocking drainage between the source of flooding and the protected built-up area from flooding. In particular, mathematical methods have been improved to solve the forecast problems of flooding in conditions of different pressure, based on the relationship between the depressions and the incoming flow of pressure water into the drainage well. The presence of underground pressure water …

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Multisector Water Consumption Database: Surkhandarya Region Of The Republic Of Uzbekistan, М. Ikramova, С. Batishev, О. Ikramov, H. Kabilov, D. Nazaraliev, А. Khodjiev, I. Akhmedkhodjaeva Mar 2020

Multisector Water Consumption Database: Surkhandarya Region Of The Republic Of Uzbekistan, М. Ikramova, С. Batishev, О. Ikramov, H. Kabilov, D. Nazaraliev, А. Khodjiev, I. Akhmedkhodjaeva

Irrigation and Melioration

The available water resources in the country are used by the different sectors of economy as industry, agriculture, energy, communal service and etc. In this case the water distribution within the river basin requires perfect information service and data exchange facilities. In the paper the developed unified multi-sector on-line database is presented aimed to monitor the water distribution among sectors of economy, database structure, and data exchange tools. The software works at operative mood, allows evaluating the combined water use efficiency by water users.

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Field Research Methods And Some Results For Distribution Of Suspended Sediment In Flow Constrained By Transverse Dams, M.R. Bakiev, K.T. Yakubov, O.M. Matkarimov, Z.B. Dovlatov Mar 2020

Field Research Methods And Some Results For Distribution Of Suspended Sediment In Flow Constrained By Transverse Dams, M.R. Bakiev, K.T. Yakubov, O.M. Matkarimov, Z.B. Dovlatov

Irrigation and Melioration

The article presents methods for determining the main parameters of flow of medium hydraulic size sediment, turbidity, sampling methods in field and the instruments used for sampling, methods of processing the samples in laboratory. Methods for setting sections and gage points and conducting field and laboratory research have been developed for flow deformed by blank and through flow transverse dams, water surface longitudinal and transverse slope takes place in the flow constrained by transverse dams, changes in suspended sediment distribution occur inversely. Location of sections for sampling is determined in the article: in the headrace –beyond dam influence zone, maximal …

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Hydromechanical Parameters Of River Sediment, A.M. Arifjanov, D.Sh. Allayorov Mar 2020

Hydromechanical Parameters Of River Sediment, A.M. Arifjanov, D.Sh. Allayorov

Irrigation and Melioration

The main problem today in irrigation canals is the danger of siltation, in this process it is important to correctly assess the factors affecting the throughput (hydromechanical parameters of sediment) and using their justification of the hydraulic elements of the flow. The article presents the results of theoretical studies of the main hydromechanical parameters (hydraulic fineness) of river sediments, in hydraulic structures, in particular in irrigation canals, which currently increasingly affect adversely moving water. It has been established that the hydraulic size entering the right bank irrigation sump of the Kokand hydropower complex varies in the range of 189-429 mm/s, …

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Design Dimensions Of Flow In Compressed Flow Beyond Combined Dikes, O. Kodirov, О. Хаlimbetov Mar 2020

Design Dimensions Of Flow In Compressed Flow Beyond Combined Dikes, O. Kodirov, О. Хаlimbetov

Irrigation and Melioration

The experimental research has shown that the kinematic pattern of flow deformed by combined structures (core part is blank and made of local materials, and the head part is made of piles), and it is more complicated than usual, although the qualitative flow schemes have much in common. The flow has the zones of backup, compression and spreading. Compression zone is discussed in the article, and the largest transverse and longitudinal drops in elevation and velocity are observed in this zone, therefore theoretically it is very difficult to set the main design dimensions of flow in this zone. Therefore, the …

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Certain Particularities Of Hydrotechical Concrete Water Permeabity, F.R. Yunusova, T.D. Muslimov Mar 2020

Certain Particularities Of Hydrotechical Concrete Water Permeabity, F.R. Yunusova, T.D. Muslimov

Irrigation and Melioration

The article discusses the issues of hydrotechnical concrete water permeability based on the requirements set to them, methods for determining concrete water permeability, characteristics of porosity and capillaries formed in concrete, as well as possibilities to decrease hydrotechnical concrete water permeability with the use of chemical admixtures and colmatation.

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Determination Of Water Discharge Of A Jet Device Taking Into Account Mutflow Flow, Q.T. Rakhimov, D.A. Abduraimova Mar 2020

Determination Of Water Discharge Of A Jet Device Taking Into Account Mutflow Flow, Q.T. Rakhimov, D.A. Abduraimova

Irrigation and Melioration

In many sectors of the water economy, one can observe the movement of a sediment stream in pressured systems. The pressure losses in the liquid and sediment joint stream are different than the movement of a single-phase flow according to their pressure loss. In this case, some difficulties arise in determining the coefficients that affect the flow rate and the average flow rate. In the article given theoretical and experimental foundations for determining the hydraulic flow parameters in during the movement of a sediment and liquid flow. Theoretical studies are based on the laws of energy conservation, and laboratory studies …

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Minimizing Control Circuits Using Logic Elements, R.T. Gaziyeva, A.M. Nigmatov, E.O. Ozodov Mar 2020

Minimizing Control Circuits Using Logic Elements, R.T. Gaziyeva, A.M. Nigmatov, E.O. Ozodov

Irrigation and Melioration

In this article considered information about contact and non-contact automation. In most cases, contact automation is used in many pumping stations. These phenomena are a power surge or voltage drop. And also the use of contact automation occupies a large place and inconvenience in operation. Non- contactless automation solves these problems. Pumping stations are usually designed with the calculation of their operation without permanent duty personnel. At large stations, a small staff is provided, which primarily carries out control functions. Set the automatic operation of pumping units. Often, automatic selection of switched-on units is carried out, reserve is withdrawn, station …

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Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture, К. Rakhmonov Mar 2020

Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture, К. Rakhmonov

Irrigation and Melioration

The generation of electronic data using the land plot scheme while maintaining the land cadastre provides significant convenience for users. Based on this concept, the author explains the conditions, factors and elements of the formation of the contours of land within the land, which plays an important role in the land cadastral work. In particular, the elements of the contour of the earth, that is, the conditions and composition of the border, the area and the order of formation of numbers, are reflected in a separate figure. It is known that the composition of agricultural land plays an important role …

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Method Of Determining The Parameters Of The Working Bodies Of The Centrifugal Fan Installed To The Sprayer, D. Dzhuraev, M.S. Halilov, I.Zh. Toirov, A.E. Urishev Mar 2020

Method Of Determining The Parameters Of The Working Bodies Of The Centrifugal Fan Installed To The Sprayer, D. Dzhuraev, M.S. Halilov, I.Zh. Toirov, A.E. Urishev

Irrigation and Melioration

The article presents the data of scientists who conducted theoretical and experimental research on centrifugal fans, they refined the calculations, improved technical characteristics and aerodynamic designs of centrifugal fans. Aerodynamic and technological schemes of centrifugal fans installed to the sprayer have been developed. The theoretical and experimental studies conducted by scientists are described: Nevelson MI, Cherkassky VM, Kalinushkin MP, Ivanov O. P., Turbin B. G., on the basis of which the authors developed a method for calculating the main parameters of the working bodies centrifugal fan. Based on the developed calculation methodology, the main parameters of the working bodies of …

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Experience Of Creation The Combined Power Complexes On The Basis Of Renewable Energy Sources, R.A. Zakhidov, A.I. Anarbaev, D.B. Kodirov, F.H. Mukhtarov Mar 2020

Experience Of Creation The Combined Power Complexes On The Basis Of Renewable Energy Sources, R.A. Zakhidov, A.I. Anarbaev, D.B. Kodirov, F.H. Mukhtarov

Irrigation and Melioration

At the article the combined energy complexes based on renewable energy sources implemented in various countries is analyzed. The regime issues of the most efficient use of maximum generation of electrical energy from solar, wind, biogas sources at reserved diesel station are given. Designs of generator modules based on a kinetic energy buffer storage device for preserving the quality of electricity from renewable energy sources with frequent changes in electrical loads of consumers are considered.

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Analysis Of Results Of Researches Of Electrotechnological Treatment Of The Cotton Trouble Up To The First Crop Collection, A. Muhammadiev, A.I. Pardaev Mar 2020

Analysis Of Results Of Researches Of Electrotechnological Treatment Of The Cotton Trouble Up To The First Crop Collection, A. Muhammadiev, A.I. Pardaev

Irrigation and Melioration

This article discusses the electrophysical characteristics of plants, more precisely the disclosure of the mechanism of electrical action on the plant through the study of the specific electrical resistance, as well as the task of developing the technological parameters of the electro-technological processing of crops. Knowledge of current value is given, passing through the minted and the rest of the cotton, determination of the negative impact of electrotechnological stamping of cotton on growth and development, yield, by electrotechnological method, including studies of the minted part of cotton, the death of the leaves, the seeds of the pests, the absence of …

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Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture, К. Rakhmonov Mar 2020

Importance Of Creating A System Of Land And Cadastral Data For Subjects Of Agriculture, К. Rakhmonov

Irrigation and Melioration

The generation of electronic data using the land plot scheme while maintaining the land cadastre provides significant convenience for users. Based on this concept, the author explains the conditions, factors and elements of the formation of the contours of land within the land, which plays an important role in the land cadastral work. In particular, the elements of the contour of the earth, that is, the conditions and composition of the border, the area and the order of formation of numbers, are reflected in a separate figure. It is known that the composition of agricultural land plays an important role …

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Obtaining A Highly Effictive Antikorrosion And Depressant Additives Based On Local Raw Materiales, Abdumalik Nabievich Rizaev, Maksimovich Khakimov Abror, Shavkat Nabievich Rizaev Mar 2020

Obtaining A Highly Effictive Antikorrosion And Depressant Additives Based On Local Raw Materiales, Abdumalik Nabievich Rizaev, Maksimovich Khakimov Abror, Shavkat Nabievich Rizaev

Journal of Tashkent Institute of Railway Engineers

Possibility of the syntheses new lubricant materials are shown in work to lubricant on base local swam to resources. Possibility of the practical application polymeric additive are shown

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The Engineering Decisions For Mitigation Of Damages In Landslide Hazardous Regions Of Uzbekistan, M.Х. Miralimov, Sh.U. Normurodov Mar 2020

The Engineering Decisions For Mitigation Of Damages In Landslide Hazardous Regions Of Uzbekistan, M.Х. Miralimov, Sh.U. Normurodov

Journal of Tashkent Institute of Railway Engineers

The article provides information on ongoing measures to protect the population, territory and infrastructure from the hazards associated with landslides and the elimination of their consequences. The whole complex of measures aimed to the decision the engineering tasks of anti-landslide protection are turned into the recognition and assessment of threats, stabilization and retention of the landslide massif.

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New Sorbents For Adsorption Cleaning Phenol-Containing Waste Water Refinery, Bahodir Bahramovich Kakharov, Uchqun Vafokulovich Umarov Mar 2020

New Sorbents For Adsorption Cleaning Phenol-Containing Waste Water Refinery, Bahodir Bahramovich Kakharov, Uchqun Vafokulovich Umarov

Journal of Tashkent Institute of Railway Engineers

The article discusses some issues of creating new adsorbents based on local raw materials and waste for the purification of phenol-containing wastewater from refineries. Studied some sorption properties of new sorbents

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Production Of Fire-Resistant Concrete Based On Technogenic Waste, Uzmonjon Turgunaliyevich Yusupov Mar 2020

Production Of Fire-Resistant Concrete Based On Technogenic Waste, Uzmonjon Turgunaliyevich Yusupov

Journal of Tashkent Institute of Railway Engineers

The article notes that at present, with the development of the construction industry, the need for fire-resistant concrete is also increasing. In increasing the volume of construction, concrete and other components are some of the resources available at the price of finished objects achieved through cost reduction. It is determined that the developed fire- and heat-resistant concrete, prepared according to the technological requirements developed by us and the established standards, will provide the facility with reliable fire safety and longevity

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Development Of A Mathematical Model For Calculating The Strength Of The Main Frame Of The Vl80s Electric Truck Body For Railway Engineering, Galina Khromova, Sergey Khromov, Davran Radjibaev Mar 2020

Development Of A Mathematical Model For Calculating The Strength Of The Main Frame Of The Vl80s Electric Truck Body For Railway Engineering, Galina Khromova, Sergey Khromov, Davran Radjibaev

Journal of Tashkent Institute of Railway Engineers

A mathematical model was developed for the main body frame of the VL80s locomotive for railway engineering, including the justification of the design modes available in operation, the calculation of quasistatic characteristics for static loading modes, for single-thrust and double-thrust modes, for compression and tension modes. A calculation is also made on the effect of distributed inertial loads, then the power factors and stresses in the calculated sections of the main body frame of the VL80s electric locomotive are calculated. Summarizing conclusions are given on the maximum voltages in the design modes of the main frame of the VL80s electric …

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Features Of Power Converters For Operation Of Electric Locomotives, Malika Nabievna Tuychieva Mar 2020

Features Of Power Converters For Operation Of Electric Locomotives, Malika Nabievna Tuychieva

Journal of Tashkent Institute of Railway Engineers

The work analyzed features of technical characteristics of AC electric locomotives from other electric locomotives used in Uzbekistan. Converters are installed in the power circuit, with GTO (lockable thyristor) for electric locomotives "Uzbekistan," and for electric locomotives "Uzbekistan - yulovci" with IGBT (bipolar transistor with isolated gate). In general, two main current converters are installed on the locomotive. Each of them consists of four-quadrant pulse rectifier with three coordinates, intermediate DC link and 2 types of voltage inverters. One inverter serves for two frame-controlled bogie motors, the other for one axial-controlled bogie motor. In case of damage to any traction …

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To The Conclusion Of The Variational Equation Of Motion Of Shell Structures Supported By Frames And Stringers, Farkhod Erkinovich Abdukadirov Mar 2020

To The Conclusion Of The Variational Equation Of Motion Of Shell Structures Supported By Frames And Stringers, Farkhod Erkinovich Abdukadirov

Journal of Tashkent Institute of Railway Engineers

In this article is given the construction of the variational equation of motion of the shell structure supported by frames and stringers. Using the Hamilton - Ostrogradsky variational principle, systems of differential equations of motion of shell elements are obtained.

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Damping Cell From Gallium Arsenide With Plasma Contacts In An Extreme Gas Discharge Cell, Khurshidjon Tolibovich Yuldashev, Sherzod Sodikjonovich Akhmedov, Jasurbek Mahammadovich Ibrohimov Mar 2020

Damping Cell From Gallium Arsenide With Plasma Contacts In An Extreme Gas Discharge Cell, Khurshidjon Tolibovich Yuldashev, Sherzod Sodikjonovich Akhmedov, Jasurbek Mahammadovich Ibrohimov

Journal of Tashkent Institute of Railway Engineers

The results of an experimental study of the photocurrent in a semi-insulating gallium arsenide with plasma contacts are presented in order to identify the conditions under which the generation interaction of a plasma by a semiconductor becomes significant. The experimental data are compared with the results predicted by the simplified theory.

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Resource-Saving Maintenance And Repair Of The Traction Transformer Based On Its Diagnostics, Mirzhalil Sagatovich Yakubov, Kamolbek Hamidovich Turdibekov, Absaid Khurramovich Sulliev Mar 2020

Resource-Saving Maintenance And Repair Of The Traction Transformer Based On Its Diagnostics, Mirzhalil Sagatovich Yakubov, Kamolbek Hamidovich Turdibekov, Absaid Khurramovich Sulliev

Journal of Tashkent Institute of Railway Engineers

Based on a generalized analysis of the compiled mathematical model of the maintenance and repair system of a traction transformer of an electrified railway, a resource-saving strategy is made based on the use of the results of technical diagnostics and providing the calculation of the optimal periodicity of the overhaul periods according to the values of the practical probability of failures, the number of factors wagging on Actual residual life and exploited in various operating conditions oviyah his work.

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Choosing The Optimal Scheme Of Placement Of Thermal Trains On The Chart Of The Movement Of Trains, Muslimа Djalalovna Akhmedova, Dilmurod Baхodirovich Butunov, Sardor Askarovich Abdukodirov Mar 2020

Choosing The Optimal Scheme Of Placement Of Thermal Trains On The Chart Of The Movement Of Trains, Muslimа Djalalovna Akhmedova, Dilmurod Baхodirovich Butunov, Sardor Askarovich Abdukodirov

Journal of Tashkent Institute of Railway Engineers

To analyze the methods of selecting the optimal scheme of layout of thermal trains at railway stations. Graphic and mathematical modeling methods are used. The factors influencing the selection of the optimal train schedule have been identified.Existing trains of thermal trains have been analyzed the schemes and mathematical formulas have been developed. Frequently used mathematical formulas at the railway stations, thermal trains create smooth and efficient traffic, and the train traffic destroys the possibility of direct adjustment.

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To The Question Of Dispatching Regulation Of Overtaking Freight Trains, Samandar Bahtiyorovich Sattorov, Ruslanovna Ibragimova Gulshan, Daurenbek Ihtiyarovich Ilesaliev Mar 2020

To The Question Of Dispatching Regulation Of Overtaking Freight Trains, Samandar Bahtiyorovich Sattorov, Ruslanovna Ibragimova Gulshan, Daurenbek Ihtiyarovich Ilesaliev

Journal of Tashkent Institute of Railway Engineers

This article discusses the problems of the influence of accelerated freight trains on station and distillation intervals, as well as on a simple freight train under overtaking. The relevance of this article is due to the fact that irrational dispatch regulation of overtaking of freight trains with accelerated trains negatively affects the throughput of the railway line.

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Linking Train Schedule Assignments To A Solid Schedule, Alexander Aleksanlrovich Svetashev, Nodir Qodirovich Aripov, Nargiza Faritovna Svetasheva Mar 2020

Linking Train Schedule Assignments To A Solid Schedule, Alexander Aleksanlrovich Svetashev, Nodir Qodirovich Aripov, Nargiza Faritovna Svetasheva

Journal of Tashkent Institute of Railway Engineers

The article provides an analysis of the composition of the sorting station during the accumulation of trains and the formation of trains with their departure on a solid schedule in order to establish dependencies that allow you to determine the cost of wagon-hours for the accumulation of cars and the rationale for the use of a solid schedule. The paper highlights the features of the process of accumulation of cars with a solid schedule as opposed to accumulation with a flexible schedule. As a result of modeling the composition of the solid schedule, the necessary parameters were calculated, which were …

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Results Of Application Of The Methods “Conditional Group Sorting” And “Combinatorial Sorting” Duringthe Multi-Group Trains Formation, Sakijan Kabildjanovich Khudayberganov, Shinpolat Mansuraliyevich Suyunbayev, Alfiya Mirkhatimovna Bashirova, Sherzod Bakhromugli Jumayev Mar 2020

Results Of Application Of The Methods “Conditional Group Sorting” And “Combinatorial Sorting” Duringthe Multi-Group Trains Formation, Sakijan Kabildjanovich Khudayberganov, Shinpolat Mansuraliyevich Suyunbayev, Alfiya Mirkhatimovna Bashirova, Sherzod Bakhromugli Jumayev

Journal of Tashkent Institute of Railway Engineers

At present, the formation of multi-group freight trains on the sorting stations is the actual issue. The main raisons are: there is no exact (developed) technology, in order to form multi-group trains on the sort stations and also, formation of such type of trains according to the established procedure based on many years of experience of the relevant personnel. In this article, the results of the applied methods are presented “Conditional group sorting” and “Combinatorial sorting” during the multi-group trains formation on the sorting station JSC Uzbek Railways. The efficiency of the method “Conditional group sorting” has been revealed regarding …

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Three-Way Thermal Model Of Asynchronous Traction Engines For Diagnostics Of Their Technical Condition, Zhavkharbek Sulton Ugli Fayzullaev Mar 2020

Three-Way Thermal Model Of Asynchronous Traction Engines For Diagnostics Of Their Technical Condition, Zhavkharbek Sulton Ugli Fayzullaev

Journal of Tashkent Institute of Railway Engineers

Mathematical models of the thermal processes of traction induction motors are developed. An induction motor is considered as a thermal system consisting of three bodies (stator winding, stator magnetic circuit and rotor), in which heat transfer is taken into account not only between the respective bodies, but also heat transfer between each body and the environment. It is shown that the steady-state excess of the stator winding temperature of a traction induction motor depends on the multiplicity of the stator winding current, the coefficient of electrical energy loss, and also on the temperature coefficient of resistance of the material of …

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An Example Of Calculating The Speed Of The Railway Carriage On The Accelerating Slope Of The Hump, Shukhrat Batirovich Djabbarov Mar 2020

An Example Of Calculating The Speed Of The Railway Carriage On The Accelerating Slope Of The Hump, Shukhrat Batirovich Djabbarov

Journal of Tashkent Institute of Railway Engineers

The paper content is based on classic provisions of mechanics (D’Alembert principle) for non-ideal communication. The authors provide with the analytical proof of that the linear acceleration of the car when it is uniformly accelerated along the descending part of the hump depends on the force that affects the car to roll down the slope of the hump, on the force of resistance of all kinds, on the adjusted weight of the car with load taking into account the moment of flywheel action. At the same time, the results of calculations prove that the rotating parts weight practically does not …

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Porosity Prediction Of Granular Materials Through Discrete Element Method And Back Propagation Neural Network Algorithm, Yu Liu, Miaomiao Li, Peifeng Su, Biao Ma, Zhanping You Mar 2020

Porosity Prediction Of Granular Materials Through Discrete Element Method And Back Propagation Neural Network Algorithm, Yu Liu, Miaomiao Li, Peifeng Su, Biao Ma, Zhanping You

Michigan Tech Publications, Part 1

Granular materials are used directly or as the primary ingredients of the mixtures in industrial manufacturing, agricultural production and civil engineering. It has been a challenging task to compute the porosity of a granular material which contains a wide range of particle sizes or shapes. Against this background, this paper presents a newly developed method for the porosity prediction of granular materials through Discrete Element Modeling (DEM) and the Back Propagation Neural Network algorithm (BPNN). In DEM, ball elements were used to simulate particles in granular materials. According to the Chinese specifications, a total of 400 specimens in different gradations …

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