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Articles 31 - 60 of 177
Full-Text Articles in Engineering
To Analysis Of The Stressed Condition And Long Durability Of Cylindrical And Conic Pipes Of Polymeric Materials, A. Abdusattarov, F.E. Abduqodirov, D.N. Shamsiyev
To Analysis Of The Stressed Condition And Long Durability Of Cylindrical And Conic Pipes Of Polymeric Materials, A. Abdusattarov, F.E. Abduqodirov, D.N. Shamsiyev
Journal of Tashkent Institute of Railway Engineers
The article considers the solution of the problem of long-term strength and damage of a conical pipe and a hollow cylinder bonded to a thin-walled shell under the action of internal pressure, taking into account the influence of visco-elastic properties of the material on the stress-strain state
Choice Of Basic Parameters, Calculation And Design Of Pulse Magnetizing Devices, J.F. Kurbanov
Choice Of Basic Parameters, Calculation And Design Of Pulse Magnetizing Devices, J.F. Kurbanov
Journal of Tashkent Institute of Railway Engineers
The purpose of this work is to develop methods and devices degaussing rail lashes. Magnetization in railway transport plays an important role for the safety of train traffic. Therefore, it is necessary to develop methods and devices for the demagnetization of products in railway automation and remote control, which is an urgent task. The residual magnetization leads to swelling of the welded joints of the rails, which leads to the formation of cracks, which can lead to train accidents during their movement. During the operation of the railways, magnetization also occurs due to the rotation of the wheel sets and …
Development Of Railway Automation And Telemechanics Systems In Modern Conditions, N.M. Aripov, D.X. Rixsiyev
Development Of Railway Automation And Telemechanics Systems In Modern Conditions, N.M. Aripov, D.X. Rixsiyev
Journal of Tashkent Institute of Railway Engineers
The article deals with the development of railway automation and telemechanics systems in modern conditions by upgrading existing track receivers of rail circuits. We recommend a microcontroller-based track receiver for station rail circuits. The developed electrical device-an electronic pulse-phase track receiver based on a microcontroller - will serve to improve the existing relay track receivers, increase the reliability and service life of the elements of the rail chain, minimize preventive maintenance, and reduce the cost of equipment. The proposed solution significantly reduces the risk of dangerous failures of station rail circuits, and also increases the safety of train traffic
Modeling Of Algorithms For Searching For Failures In Rail Circuits Of Railway Automation And Telemechanics Using Hierarchical Colored Petri Time Networks, P.E. Bulavskiy, O.K. Vaisov
Modeling Of Algorithms For Searching For Failures In Rail Circuits Of Railway Automation And Telemechanics Using Hierarchical Colored Petri Time Networks, P.E. Bulavskiy, O.K. Vaisov
Journal of Tashkent Institute of Railway Engineers
Studies have been carried out to estimate the recovery time of the operation of rail circuits of alternating current of 25 Hz, taking into account the formalization of technological processes for searching and eliminating failures based on the apparatus of hierarchical color temporary Petri nets. The developed simulation model is constructed by analyzing the state of technical means, statistical, regulatory documentation and observing technical specifications and regulations, local conditions and the location of signal points on the stage. The methods of the theory of Petri nets are used, which are based on the discrete-event paradigm of simulation modeling and the …
Labor Conditions Of Locomotive Staff Of Jsc "Uzbekiston Temir Yullari", O.T. Aliev
Labor Conditions Of Locomotive Staff Of Jsc "Uzbekiston Temir Yullari", O.T. Aliev
Journal of Tashkent Institute of Railway Engineers
The paper analyzes the results of certification of jobs for locomotive crew workers at the electric locomotive depot TCH-1, which is part of the structure of JSC “Uzbekistan Temir Yollari”. The working conditions of locomotive drivers and their assistants are determined with the influence of external and internal production factors on them. Trends in the occurrence of occupational diseases, such as sensorineural hearing loss and vibration disease in locomotive crew workers, were identified. Specific proposals for identified deficiencies are identified. According to the results of studies, it was determined that in such circumstances it is possible to provoke durable multifunctional …
Express Delivery By Rail Using Speed And High-Speed Trains, Sh.Sh. Kayumov
Express Delivery By Rail Using Speed And High-Speed Trains, Sh.Sh. Kayumov
Journal of Tashkent Institute of Railway Engineers
Currently, fast delivery of documents, money and small parcels are in great demand in the country. Due to the slow speed of delivery and quality of service, fewer and fewer people trust the state mail. In the article, the author suggests using speed and high-speed trains for these purposes, which will enable users of Express Mail to save time and money
Development Of Economic And Mathematical Model Of Calculation Of Expenses At Processing Of Cars At Sorting Station, D.B. Butunov
Development Of Economic And Mathematical Model Of Calculation Of Expenses At Processing Of Cars At Sorting Station, D.B. Butunov
Journal of Tashkent Institute of Railway Engineers
In this article the model is developed for calculation of the expenses connected with processing of cars on marshalling yard. Methods of economic-mathematical modeling are applied. It is formulated technique for definition of expenses when processing cars on marshalling yard. Expenses, the cars connected with processing on the example of classification yard service of "Ch" JSC UTY are calculated. Dynamics and structure of expenses by types of works on processing of cars at the station "Ch" is considered
Prospective Development Of The Railway Station Akhangaran-Tukimachi-Sirdarya, D.I. Ilesaliev, S.B. Sattorov
Prospective Development Of The Railway Station Akhangaran-Tukimachi-Sirdarya, D.I. Ilesaliev, S.B. Sattorov
Journal of Tashkent Institute of Railway Engineers
The planned China-Kyrgyzstan-Uzbekistan railway line is designed to connect East Asia with the Middle East and Southern Europe. However, aging of fixed assets of railways significantly reduces reliability and their throughput in the conditions of a continuously growing volume of freight traffic. This problem is associated not only with the development of new or improvement of existing technical solutions, but also with technological solutions related to planning, organizing and managing traffic flows in the future. After the launch of the China-Kyrgyzstan-Uzbekistan railway line, the Tukimachi station will become a major railway junction at the crossroads of North-South and East-West transport …
Issues Of Regulation Of Train Locomotives Of The Railway Section Chukursay-Saryagash, M.N. Masharipov, Sh.M. Suyunbaev, M.M. Rasulmukhamedov
Issues Of Regulation Of Train Locomotives Of The Railway Section Chukursay-Saryagash, M.N. Masharipov, Sh.M. Suyunbaev, M.M. Rasulmukhamedov
Journal of Tashkent Institute of Railway Engineers
The successive arrival of freight trains to the station performing border control of trains leads to a glut of adjacent sections by trains, mainly due to the employment of border guard brigades. Without the use of operational solutions in such conditions, the reserve of bandwidth is reduced and the need for locomotives is increased due to hot downtimes when the train station is not accepted for border control. This article has developed a methodology for regulating train locomotives, which allows to increase the useful work of train locomotives. The developed methodology will assist engineers and technicians in the connection of …
The Method Of Calculating The Middle Simple Locomotive And The Train Composition In The Turnover Point Based On The Modeling In The Conditions Of A Pair Traffic Of Trains, M.N. Masharipov
Journal of Tashkent Institute of Railway Engineers
The article developed a method for calculating the average downtime of a locomotive and the composition of a train at a turnaround point based on modeling in a pair train schedule. As a result of this, it is scientifically substantiated that strict adherence to the principle “trains do not expect a locomotive” will lead to a significant increase in the cost of locomotive hours at the point of turnover
Method Of Upgrading A Cargo Transport Units, Avaz Mirsultanovich Merganov
Method Of Upgrading A Cargo Transport Units, Avaz Mirsultanovich Merganov
Journal of Tashkent Institute of Railway Engineers
The costs associated with handling and transport- warehousing operations reaching about half of the total costs of the transportation process. In this regard, it is necessary to study the issues of consolidation of cargo units, as this will increase productivity and minimize logistics costs. This article describes the search algorithm for the consolidation of cargo units. The study also provides mathematical models of the relationship between the parameters of a piece load, container and a standard pallet. The practical significance is to increase the utilization rate of the standard pallet, besides the proposed method will allow you to choose the …
Mathematical Model Of Determining The Optimal Period Of Technical Maintenance Of The Special Self-Propelled Rolling Stock, Z.G. Mukhamedova
Mathematical Model Of Determining The Optimal Period Of Technical Maintenance Of The Special Self-Propelled Rolling Stock, Z.G. Mukhamedova
Journal of Tashkent Institute of Railway Engineers
The article covers the mathematical model for determining the optimum periodicity of maintenance, separately for mechanical, electrical and hydraulic equipment for emergency recovery vehicles
A Study Of The Implementation Of Standards-Time Of Wagons At Sorting Station, D.B. Butunov
A Study Of The Implementation Of Standards-Time Of Wagons At Sorting Station, D.B. Butunov
Journal of Tashkent Institute of Railway Engineers
The implementation of the established norms of the time spent by cars at the sorting station is investigated. The methods of statistical data processing and comparison of the time spent at the station with the established scheduled tasks were used. The structure of the time spent by transit cars with processing at the sorting station is analyzed. An element-by-element analysis of the time of transit cars with processing is carried out. The average daily savings and unproductive loss of time on the elements are determined. The costs of processing cars at the station, falling on each element of the time …
Geometric Formation Of Schemes Of Technical Objects In Automated Design Systems, M.A. Khadzhimuhametova
Geometric Formation Of Schemes Of Technical Objects In Automated Design Systems, M.A. Khadzhimuhametova
Journal of Tashkent Institute of Railway Engineers
This paper discusses the issues of mathematical support for the formation of various schemes of complex technical objects for a computer-aided design subsystem. Information is given on the description of the station diagram using finite element methods. On the one hand, it is required that the mathematical model be as universal as possible (cover all types of de-signed schemes), accurate, algorithmically reliable. On the other hand, it is required to ensure the minimum cost of the required memory of com-puter time. These contradictions are eliminated by creating a bank of models. Models are planned from separate modules of structural and …
Development Of Production Technology Of Foreign Resource-Saving Induction Motors, S.N. Kayumov
Development Of Production Technology Of Foreign Resource-Saving Induction Motors, S.N. Kayumov
Journal of Tashkent Institute of Railway Engineers
In the paper of work on the topic "Of Ethnology construction and work of asynchronous engines", in the laboratory class, the control task, conclusions and annexes. In accordance with the curriculum in the discipline "Electric and basis electronics", the fundamentals of the theory of asynchronous squirrel-cage rotors are developed ethnologic. A training module is developed, and a method for performing laboratory work, innovations and foreign experience, in the same place, a brief description of the curriculum of the program, in the laboratory class, the control task, conclusions and annexes.
Efficient Frequency Control System Of Asynchronous Motor, U.T. Berdiyev, A. Norboyev
Efficient Frequency Control System Of Asynchronous Motor, U.T. Berdiyev, A. Norboyev
Journal of Tashkent Institute of Railway Engineers
This paper discusses efficient frequency control systems that are widely used in the motion of production mechanisms of asynchronous motors with short-circuited rotor. From these systems, the functional circuit of the scalar frequency control system was analyzed
Iron-Based Soft Magnetic Materials Used In Electrical Engineering, G.A. Govor, A.K. Vecher, U.T. Berdiyev, N.B. Pyrmatov
Iron-Based Soft Magnetic Materials Used In Electrical Engineering, G.A. Govor, A.K. Vecher, U.T. Berdiyev, N.B. Pyrmatov
Journal of Tashkent Institute of Railway Engineers
This article discusses the characteristics and ways of obtaining soft magnetic materials on iron bases for manufacturing separate parts of magnetic cores of electrical machines. Soft magnetic materials shall have high initial and maximum magnetic permeability and low coercive force, and they shall have little loss of eddy current remagnetization, have a small hysteresis loop area and have relatively high electrical resistance. The production of electrical machine parts by powder metallurgy, compared to the magnetic metal products currently used, offers great advantages, reduced weight and size of parts, wider frequency range of materials operation, smaller vortex and magnetic losses and …
Plots Of Pojected Sorting Selection Hill’S The Uncertainty In The Formulas Of The Peak Constructive And Technological, Shuxrat Umarxodjayevich Saidivaliev
Plots Of Pojected Sorting Selection Hill’S The Uncertainty In The Formulas Of The Peak Constructive And Technological, Shuxrat Umarxodjayevich Saidivaliev
Journal of Tashkent Institute of Railway Engineers
In the article, on the basis of theorems on the change of kinetic energy for a non-free material point in the final form of theoretical mechanics, formulas for determining the braking path of the car in the braking zone of the sorting hill are derived. With a known value of the acceleration during the braking of the car the path of the car braking section can also be determined by the formula of the path of elementary physics. In the article on the basis of the theorem on the change of kinetic energy for a non-free material point in the …
Preventive Monitoring Railway Reinforced Concrete Bridges, I.G. Ganiev
Preventive Monitoring Railway Reinforced Concrete Bridges, I.G. Ganiev
Journal of Tashkent Institute of Railway Engineers
One of the main tasks of the railway industry of Uzbekistan, directly related to the development of the national economy, is the radical improvement of the condition of railways and structures on them. Therefore, the aim of this work is to develop practical preventive monitoring to increase the efficiency of the operational process. To achieve this goal, methods of scientific analysis, probability theory and stock theory, the principles of interaction, as well as experimental-static methods of compiling models were used. Using the developed preventive monitoring, it can be correctly organized preventive monitoring to ensure the required operational reliability of existing …
The Causal Relationships In The Management Process Of Cement Production, Alishev Sh., Ortikov Z.
The Causal Relationships In The Management Process Of Cement Production, Alishev Sh., Ortikov Z.
Problems of Architecture and Construction
In the article on the basis of cause-effect relationships in cement, which are both direct and reverse in nature, it is revealed that the compressive strength of concrete largely depends on the reactivity of the anhydrous compounds obtained during firing, the fineness of grinding, the amount of free lime and other oxides, as well as a great influence on the quality of cement has a fine grinding of raw materials. Results of calculation of standard deviations. The models are obtained on the basis of the results of chemical analysis and individual expressive data of physical and mechanical character, on the …
Prospects Of Development Of Deposits Of Nonmetallic Minerals Kyzylkum Such As Quartz Sands, A.U. Mirzaev, S.V. Pochtoviy, F.F. Istablaev, Sh.R. Kurbonova
Prospects Of Development Of Deposits Of Nonmetallic Minerals Kyzylkum Such As Quartz Sands, A.U. Mirzaev, S.V. Pochtoviy, F.F. Istablaev, Sh.R. Kurbonova
Gorniy vestnik Uzbekistana
Quartz sand plays essential role in the construction and glass industry, but construction organizations of Uzbekistan has not paid due attention to use quartz sand from domestic deposits. This article provides information about the prospects of the development of deposits of quartz sand in Kyzylkum, and also presents a project of a factory for the enrichment of Dzheroy sands with a capacity of 1 thousand tons per day of sand concentrate being developed by the Navoi branch of the Academy of Sciences of the Republic of Uzbekistan using a washing device as a washing machine pulsating columns.
Features Of Designs Of Nanosenses For The Oil Industry, A.E. Vorobev, Zhang Lianzi
Features Of Designs Of Nanosenses For The Oil Industry, A.E. Vorobev, Zhang Lianzi
Gorniy vestnik Uzbekistana
Development of design features of nanosensors for oil branch is shown. It is established that in modern nanosensors usually influence formation of a working signal as environment qualitative quantitative indices (values of temperature, pressure, speed of migration of fluids, contents of chemical elements, sizes рН, etc.) and the nature (predetermining properties), structure and extent (the geometrical sizes) of nanoparticles of sensitive elements which the studied environment influences, forming as a result this working signal. The basic design of nanosensors and the mechanism of their work is described. Distribution of nanosensors on classes depending on the principles and mechanisms of action …
Production Of Nitric Acid Ethers Of Cellulose In The Environment Of Low Concentrated Nitric Acid, H.Ch. Mirzakulov, T.T. Safarov, H.S. Beknazarov, G.O. Mamazhanov
Production Of Nitric Acid Ethers Of Cellulose In The Environment Of Low Concentrated Nitric Acid, H.Ch. Mirzakulov, T.T. Safarov, H.S. Beknazarov, G.O. Mamazhanov
Gorniy vestnik Uzbekistana
The article proposes a new method for producing cellulose nitrate esters by pretreatment of cellulose with low concentrated nitric acid. Optimal conditions for the esterifi- cation reaction have been developed. Some properties of mono- and di- and trisubstituted nitrates were studied: degree of substitution, solubility, degree of polymerization, IR spectra, X-ray diffraction patterns are given.
The Researching Some Containig Rocks Of Uranium Ores By Method Of The Thermal Analysis, K. Sanakulov, M.A. Kurbanov, U.Z. Sharafutdinov
The Researching Some Containig Rocks Of Uranium Ores By Method Of The Thermal Analysis, K. Sanakulov, M.A. Kurbanov, U.Z. Sharafutdinov
Gorniy vestnik Uzbekistana
The paper presents the results of comparative laboratorial testings physical and chemical properties ion-change resins: BD-706, BO – 020, BO-008, BD-709S, BD- 710M, А-560, А – 508, MS-2040. There are results present, that resins ВО-008, BD-709S, BD-710M and MS 2040 do not comply with requirements ОSТ 95.291-86. Kinet- ics of sorption uranium from sulphuric acid solution and carbonate solution presented, that resin А-560 has the best indexes.
Volcanism Role In Formation Of Burned Breeds On Brown-Coal Fields Southern Fergana Coal Basin, A.E. Vorobev, O.Sh. Shamshiev, N.T Tolobaeva
Volcanism Role In Formation Of Burned Breeds On Brown-Coal Fields Southern Fergana Coal Basin, A.E. Vorobev, O.Sh. Shamshiev, N.T Tolobaeva
Gorniy vestnik Uzbekistana
Are shown a volcanism role in formation of burned breeds on brown-coal fields of the Southern Fergana coal basin (Kyrgyzstan). So far burned breeds traditionally were considered as products of thermal transformation clay, clay алевритовых breeds, formed as a result of the underground fires of layers of coal. However, the complex of geological factors revealed recently when studying burned breeds, allows to assume their origin not only due to the underground fires of layers of coal, but also and a vol- canogenic and sedimentary way. Field works included supervision, drawing up litologo-petrographic, mineral and geochemical, structural and lithologic cuts with …
Gis-Based Approach For Sinkhole Occurrence Risk Mitigation In Urban Areas For Historic Wieliczka Salt Mine, Agnieszka Malinowska, Ryszard Hejmanowski
Gis-Based Approach For Sinkhole Occurrence Risk Mitigation In Urban Areas For Historic Wieliczka Salt Mine, Agnieszka Malinowska, Ryszard Hejmanowski
Gorniy vestnik Uzbekistana
The article presents the results of the definition of a new methodology for assessing the risk of flooding a shallow slotted mine, which was carried out on the square above the Wieliczka Salt Mine, which is a world heritage. Vertical stresses are estimated on the basis of the theoretical state of rock mass deformation in the area of test chambers. In addition, the risk for chambers indicated in the zone was calculated based on the theory of arctic pressure. The final stage of the study was spatial analysis, which led to the identification of chambers, potentially subject to the influence …
Development Of Technology For Processing Of Sulfide Ore Deposits Of Kokpatas And Daugyztau., K.S. Sanakulov, H. Ahmedov, I.S. Nurmukhamedov
Development Of Technology For Processing Of Sulfide Ore Deposits Of Kokpatas And Daugyztau., K.S. Sanakulov, H. Ahmedov, I.S. Nurmukhamedov
Gorniy vestnik Uzbekistana
In clause are given the short review on material structure persistent sulfide gold containing ores of deposits Kokpatas and Daugiztau. Also in clause the results of laboratory researches executed in SE "IMR" on study of mineral structure and enrichment of tests of ores of deposits Kokpatas and Daugiztau, and also pyro- and hydrometallurgical processing of the received concentrates are resulted. At flotation enrichment of ores an opportunity of application local reagents is considered. At cyaniding, the rest of alkaline processing the burned material of a mixed concentrates of the deposits, received from ores, Kokpatas and Daugiztau the extraction of gold …
Determination Of The Suitability Of Balance Ores "Almalyk Mmc" Jsc To Processing By Method Biodinstellation, M.G. Sagdieva, Sh. T. Khidirov, A.M. Mavzhudova, R.Ch. Omonov
Determination Of The Suitability Of Balance Ores "Almalyk Mmc" Jsc To Processing By Method Biodinstellation, M.G. Sagdieva, Sh. T. Khidirov, A.M. Mavzhudova, R.Ch. Omonov
Gorniy vestnik Uzbekistana
Over the 70 years of operation, Almalyk Mining and Metallurgical Combine (AGMK) has accumulated 155 million tons of waste ore and 1,350 million tons of flotation tailings of a copper-processing plant in the territory of the Almalyk region, which occupy huge areas and pose an environmental hazard. The objects of research at the Almalyk ore field were: A-4 blade (oxidized ore), A-7 (sulfide ore), 9a (oxidized ore), and open-pit ore of Kalmakyr deposit. The paper presents the microflora of all the studied dumps, from which the most active acidophilic associations of iron-sulfur-oxidizing bacteria were selected. Laboratory studies have been carried …
Researche Of Certain Host-Rocks Of Uranium Ores By The Method Of Thermal Analysis, O.F. Petukhov, B.T. Ruziev, U.Z. Sharafutdinov, Khalimov U.I.
Researche Of Certain Host-Rocks Of Uranium Ores By The Method Of Thermal Analysis, O.F. Petukhov, B.T. Ruziev, U.Z. Sharafutdinov, Khalimov U.I.
Gorniy vestnik Uzbekistana
The article presents the results of thermal analysis of samples of minerals – calcite (limestone), dolomite, magnesite and quartz, as well as their mixtures in the host rock of uranium ore. It has been established that thermal decomposition (dissociation) of calcite occurs in one stage at a temperature of 870°C, magnesite - in one stage at 6500° C, and dolomite - in two stages at 7300°C and at 9100°C. Thermal analysis of a sample of uranium ore showed that, as host rocks, it contains calcite, dolomite, and quartz.
Mechanism Of Fluid Migration In Reservoirs-Collectors, A.E. Vorobev, Z.T. Martin, K.A. Vorobev
Mechanism Of Fluid Migration In Reservoirs-Collectors, A.E. Vorobev, Z.T. Martin, K.A. Vorobev
Gorniy vestnik Uzbekistana
The mechanism of fluid migration in stratium - reservoirs is revealed. The relevance of the study of the mechanism of migration of fluids is determined by the high (up to 90%) water cut of recoverable oil. It has been established that the migration of water and oil is mainly influenced by the type, nature and parameters of their interaction with host rocks, which have different values of wettability and sorption capacity. The amount of wettability is influenced by the pH values of water and oil. It is shown that pores and capillaries often have a mixed type of wettability, depending …