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Articles 55891 - 55920 of 198159

Full-Text Articles in Engineering

Application Of Controllable Electric Pulse Wave Permeability-Enhancing Technology In The Low-Permeability Coal Seams, An Shigang, Chen Dianfu, Zhang Yongmin, Kong Delei, Li Yang, Zhang Di, Wang Yang Aug 2020

Application Of Controllable Electric Pulse Wave Permeability-Enhancing Technology In The Low-Permeability Coal Seams, An Shigang, Chen Dianfu, Zhang Yongmin, Kong Delei, Li Yang, Zhang Di, Wang Yang

Coal Geology & Exploration

Controllable electric pulse wave permeability-enhancing technology is one of the ideal measures for anti-reflection transformation of low-permeability coal seams. The optimization of construction schemes needs to be solved urgently. Aiming at this problem, in the low-permeability coal seam of Baode coal mine, controllable electric pulse wave permeability-enhancing technology was adopted to optimize the permeability-enhancing construction scheme of the boreholes. Test results show that the controllable electric pulse wave permeability-enhancing effect is the best under the condition of the average permeability-enhancing section of 131 m, the impact density of 0.5 times/m and the average daily extraction volume in an anti-reflection borehole …

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Reasons Of Low Yield And Stimulation Measures For Cbm Wells In Junlian Area, Li Ying, Zheng Rui, Luo Kai, Zhu Yanming, Zhang Yimin Aug 2020

Reasons Of Low Yield And Stimulation Measures For Cbm Wells In Junlian Area, Li Ying, Zheng Rui, Luo Kai, Zhu Yanming, Zhang Yimin

Coal Geology & Exploration

Coalbed methane fields in Junlian area have good development potential, but the existence of a large number of low-production and low-efficiency wells has restricted the increase of productivity. This paper analyzes the coupling relationship between high-productivity wells and geological factors from the perspective of geological engineering integration, analyzes the causes of inefficient wells from three aspects of geology, drainage and engineering, and evaluates the corresponding reform measures. The results show that the formation of inefficient wells in the north and the west of the study area is mainly affected by gas-bearing properties, fault distribution, production horizons, production and drainage rhythms, …

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Geochemical Characteristics And Their Origin Of Cbm In Xingxian Area, Ordos Basin, Wang Xiangye, Sun Baoping Aug 2020

Geochemical Characteristics And Their Origin Of Cbm In Xingxian Area, Ordos Basin, Wang Xiangye, Sun Baoping

Coal Geology & Exploration

The distribution of carbon and hydrogen isotope of methane is of signification in revealing the origin, the distribution of CBM reservoir, and the source evaluation of CBM. To study the origins of coalbed methane and carbon dioxide, the data of the components、carbon and hydrogen isotopes of CBM from the desorption gas of coal core from Xingxian area were analyzed. With the CBM origins chart board, and the geological environment, the geological effect of the formation and the evolution of CBM were analyzed. the ratios of CBM with different origins were estimated. The results show that the δ13C, values …

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Corrosion And Degradation Of Feldspar Sandstone In Acidic Environment, Zhou Bin, Zhang Dongming, Xu Jiang, Cheng Liang, Li Jiaxin Aug 2020

Corrosion And Degradation Of Feldspar Sandstone In Acidic Environment, Zhou Bin, Zhang Dongming, Xu Jiang, Cheng Liang, Li Jiaxin

Coal Geology & Exploration

In order to study the effect of acidic environment on the corrosion and deterioration of rocks, CT images processing technology was used to analyze the meso-composition and structural changes of feldspar sandstone after soaking in acidic water. Shimadzu AGI-250 servo material testing machine was used to carry out uniaxial compression test to observe the deterioration of mechanical parameters. The results show that the total density of the feldspar sandstone decreased Ofter the acidic environment treatment, the distribution trend is homogeneous, and the mineral with higher density is formed in the local area. The secondary pores of the feldspar sandstone increased …

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Sensitivity Analysis Of Disaster-Pregnant Environmental Factors For Slope Geological Hazards In Kaiyang County, Guizhou Province, Qin Yigen, Yang Genlan, Xie Jin, Liu Bangyu Aug 2020

Sensitivity Analysis Of Disaster-Pregnant Environmental Factors For Slope Geological Hazards In Kaiyang County, Guizhou Province, Qin Yigen, Yang Genlan, Xie Jin, Liu Bangyu

Coal Geology & Exploration

The geological conditions are complex in Kaiyang County, and geological disasters occur frequently. On the basis of field geological hazard investigation, 8 factors including elevation, slope, slope direction, engineering petrofabric, slope structure, fault, drainage and NDVI value are selected as the disaster-pregnant factors of slope geohazards. Based on the GIS platform, and by using the certainty factor model(CF) and the sensitivity-exponential(E), susceptibility of these 8 factors are researched. The results show that the areas with elevation from 515 to 993 m, the slope degree from 20° to 50°, the aspect of the west, the northwest and the southeast, …

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Study On The Effect Of Dual-Freedom Coupling Between The Tilt Geophones And The Surface, Sun Chao, Sun Liang, He Dengke, Tian Siqing Aug 2020

Study On The Effect Of Dual-Freedom Coupling Between The Tilt Geophones And The Surface, Sun Chao, Sun Liang, He Dengke, Tian Siqing

Coal Geology & Exploration

In the process of coalfield seismic data acquisition, there is a situation of repeated geophone layout at the same point. The tilt angle difference of the geophones will leads the change of coupling condition between the geophone and the surface, which affects the quality of seismic data acquisition. In this paper, the tilt angle parameters of geophone were introduced into the coupling system of the geophone and the surface. From the point of view of vibration mechanics, the "vibration system with coupling of the dual degree of freedom" of tilt geophone was deduced. The influences of the tilt angle of …

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The High-Resolution Transient Electromagnetic Detection Technology For Ultra-Shallow Layer In Coal Mine, Zhang Jun Aug 2020

The High-Resolution Transient Electromagnetic Detection Technology For Ultra-Shallow Layer In Coal Mine, Zhang Jun

Coal Geology & Exploration

In order to reduce the blind zone of the transient electromagnetic detection in mines and improve the detection accuracy, the high-resolution transient electromagnetic detection technology for the ultra shallow layer in mines is studied. The high-resolution transient electromagnetic detection technology for ultra-shallow layer in mines is not only suitable for conventional mine geological exploration, but also for high-resolution detection of shallow geological bodies such as cracks in the roof of the mine roadway, ensuring the safe and efficient mining. Through theoretical research, the feasibility of the shallow high-resolution transient electromagnetic method in mine was established; the hardware system of the …

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Experimental Study On The Frequency Dispersion Response Of Composite Electrical Properties Of Coal, Meng Hui, Li Jian, Lei Dongji, Wang Yajuan Aug 2020

Experimental Study On The Frequency Dispersion Response Of Composite Electrical Properties Of Coal, Meng Hui, Li Jian, Lei Dongji, Wang Yajuan

Coal Geology & Exploration

In order to study the characteristics of frequency dispersion response of the composite electrical properties of coal, the real part R and imaginary part X of the composite resistance of coal body at different direction in different measured areas were measured, the frequency dispersion characteristics were analyzed, different classical models were used to conduct data inversion and comparison. The results show that the composite electrical property parameters(absolute value of R and X) of coal are inversely proportional to the measured area, the characteristic frequency points are not offset, the X-frequency divergence decreases with the increase of measurement area; …

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Research Status And Prospect Of Drill Pipe Thread Used In Coal Mine, Tian Dongzhuang, Chen Yanyu, Li Qing, Dong Mengmeng, Mou Peiying Aug 2020

Research Status And Prospect Of Drill Pipe Thread Used In Coal Mine, Tian Dongzhuang, Chen Yanyu, Li Qing, Dong Mengmeng, Mou Peiying

Coal Geology & Exploration

Drill pipe is one of the main device for drilling construction of gas drainage, water detection and drainage and geological exploration. Due to complicated force conditions and using environment of drill pipe, accidents in boreholes caused by the failure of drill pipe threads are common. According to different structural classification, the characteristics of drill pipe thread structure in coal mines are introduced in detail; the current research status of thread stress distribution and failure analysis of thread are summarized. The research methods of thread stress distribution mainly include analytical method, finite element method and test method. The main causes of …

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Design Of Piezoelectric Effect-Based Energy Recovery Device Wile Drilling, Wu Tianyu, Zheng Jun, Zhang Bo, Chen Yu, Tian Hong, Dou Bin Aug 2020

Design Of Piezoelectric Effect-Based Energy Recovery Device Wile Drilling, Wu Tianyu, Zheng Jun, Zhang Bo, Chen Yu, Tian Hong, Dou Bin

Coal Geology & Exploration

Aiming at the problem of continuous power supply of downhole instruments and the recovery of longitudinal vibration energy of drill pipe in drilling field, a new type of energy recovery device based on positive piezoelectric effect was designed. The radial dimension parameters and piezoelectric materials were designed by field experiences and geological survey reports. The piezoelectric coupling model was established based on the numerical simulation software COMSOL Multiphysics, and the length range and the best installation position of the piezoelectric plate were obtained through forced vibration analysis. Through modal analysis and frequency response research, it is obtained that the natural …

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Rapid Visual Presentation To Support Geospatial Big Data Processing, E. Levin, W. Roland, R. Habibi, Z. An, R. Shults Aug 2020

Rapid Visual Presentation To Support Geospatial Big Data Processing, E. Levin, W. Roland, R. Habibi, Z. An, R. Shults

Michigan Tech Publications, Part 1

Given the limited number of human GIS/image analysts at any organization, use of their time and organizational resources is important, especially in light of Big Data application scenarios when organizations may be overwhelmed with vast amounts of geospatial data. The current manuscript is devoted to the description of experimental research outlining the concept of Human-Computer Symbiosis where computers perform tasks, such as classification on a large image dataset, and, in sequence, humans perform analysis with Brain-Computer Interfaces (BCIs) to classify those images that machine learning had difficulty with. The addition of the BCI analysis is to utilize the brain's ability …

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Mimicking Blood Rheology For More Accurate Modeling In Benchtop Research, Lindsey Webb Aug 2020

Mimicking Blood Rheology For More Accurate Modeling In Benchtop Research, Lindsey Webb

The Pegasus Review: UCF Undergraduate Research Journal

Because blood is challenging to use as a working fluid in a laboratory setting due to health and safety concerns, a blood analogue would be useful to perform benchtop experiments. Viscosity is an important fluid property for modeling and experiments, especially because blood is a shear thinning fluid; therefore, it has a decreasing viscosity with higher shear rates. This project seeks to create a blood-mimicking fluid for benchtop laboratory use. Numerous fluids with different combinations of water, glycerin, salt, and xanthan gum (XG) were created to mimic blood viscosity at different hematocrit levels. Four additional solutions were also created from …

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An Effective Method For Synthesizing The Abbreviated Disjunctive Normal Form Of A Boolean Function, Erkin Urunbaev Aug 2020

An Effective Method For Synthesizing The Abbreviated Disjunctive Normal Form Of A Boolean Function, Erkin Urunbaev

Scientific Journal of Samarkand University

In discrete mathematics, minimizing Boolean functions in the class of disjunctive normal forms is one of the necessary tasks. This paper presents an effective method for synthesizing the reduced disjunctive normal form of a Boolean function.

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On The Localized Settlement Of Geodetic Networks And Points For The Monitoring Of The Migration Of Landslides, B.R. Nazarov, H.T. Kayumova, R.X. Mukarramov Aug 2020

On The Localized Settlement Of Geodetic Networks And Points For The Monitoring Of The Migration Of Landslides, B.R. Nazarov, H.T. Kayumova, R.X. Mukarramov

Journal of Tashkent Institute of Railway Engineers

The article is devoted to the formation of on-site geodetic network points to prevent geological processes such as landslides or large deformations, and provides methodology for establishing network points to continuously monitor the movement of avalanche sites. In addition, the methodology for the creation of geodetic network points at impassable distances are described.

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Research Of Porosity Of A Cement Stone With A Zeolite Containing Filler And A Superplasticstificator, Anvar Ishanovich Adilhodzhaev, I.A. Kadyrov, K.S. Umarov Aug 2020

Research Of Porosity Of A Cement Stone With A Zeolite Containing Filler And A Superplasticstificator, Anvar Ishanovich Adilhodzhaev, I.A. Kadyrov, K.S. Umarov

Journal of Tashkent Institute of Railway Engineers

The question of the influence of the zeolite-containing filler of the Beltau deposit and the polycarboxylate superplasticizer on the formation of porosity of cement stone is considered. The results of experiments to establish the effect of a zeolite-containing filler and a plasticizing additive on pore size distribution are graphically presented. The data obtained confirm the advisability of using this type of filler in concrete.

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Features Of Laboratory Testing Methods Of Clayey Soils, A. Zhussupbekov, A. Tulebekova, U. Abduraimov Aug 2020

Features Of Laboratory Testing Methods Of Clayey Soils, A. Zhussupbekov, A. Tulebekova, U. Abduraimov

Journal of Tashkent Institute of Railway Engineers

The article compares the results of laboratory tests of dispersed soils to determine their strength characteristics. For this purpose, soils were tested on devices with three-axis compression and single-plane cut. In calculations for clay and sandy soils, indicators of their strength properties are used, which include such characteristics as the angle of internal friction φ and specific adhesion c. Based on the results of this work, recommendations on the practical application of the obtained soil characteristics for the geo-information geotechnical database of Astana were compiled.

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Mathematical Modeling Of The Carriage Movement Along The Descending Part To Movement Of The Marshalling Hump, Kh.T Turanov, Sh.U. Saidivaliev, Sh.B. Djabbаrov, Kh.Kh. Djalilov Aug 2020

Mathematical Modeling Of The Carriage Movement Along The Descending Part To Movement Of The Marshalling Hump, Kh.T Turanov, Sh.U. Saidivaliev, Sh.B. Djabbаrov, Kh.Kh. Djalilov

Journal of Tashkent Institute of Railway Engineers

In the article, based on the basic law of point dynamics with non-ideal connection of theoretical mechanics, the speed of the car movement on each section of the descending part of the marshalling hump. A generalized model of the speed of the car at the calculated point of the marshalling hump is obtained. This model made it possible to calculate the instantaneous values of the speed of the car from the top of the hill to the calculated point in a continuous mode. This made it possible to speed up the process of plotting changes in accelerations, speeds, and time …

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On Design Features And Improvements Freight Wagon Braking Systems, U.Sh. Israilov Aug 2020

On Design Features And Improvements Freight Wagon Braking Systems, U.Sh. Israilov

Journal of Tashkent Institute of Railway Engineers

The review of the basic schemes of brake lever transmissions used on freight wagons of Uzbekistan is presented. The advantages and disadvantages inherent to these schemes are shown. Methods of brake systems improvement are considered and the analysis of theoretical methods of their design evaluation is made.

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Equipment For Transportation Of Wooden Materials: New Technological Solutions And The Use Of High Strong Steels, N.A. Tanicheva, I.O. Filippova, R.V. Rahimov, Ya.O. Ruzmetov Aug 2020

Equipment For Transportation Of Wooden Materials: New Technological Solutions And The Use Of High Strong Steels, N.A. Tanicheva, I.O. Filippova, R.V. Rahimov, Ya.O. Ruzmetov

Journal of Tashkent Institute of Railway Engineers

There is a need to develop a new design of removable reusable means for the transportation of timber on universal wagon platforms, including using high-strength steel. The use of high-strength steel improves the technical and economic performance of platform wagons for the transportation of timber. The need to develop the regulatory and technical base for the introduction of new high-strength steels in the wagon industry has been identified.

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Forecast Efficiency Of Application Of Electronic Documents In Cargo And Commercial Works On Railway Transport, N.M. Aripov, Sh.Sh. Kamaletdinov Aug 2020

Forecast Efficiency Of Application Of Electronic Documents In Cargo And Commercial Works On Railway Transport, N.M. Aripov, Sh.Sh. Kamaletdinov

Journal of Tashkent Institute of Railway Engineers

This article provides a predictive economic assessment of the introduction of electronic document management technology based on an electronic digital signature on the processes of freight and commercial work in rail transport. To determine the economic efficiency of the proposed technology, a technique was used that includes countable and uncountable effects. The constituent elements, the main economic indicators of the implementation of the automated system are detailed. Savings of money and time of railway transport and users of freight transportation services are determined.

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Increasing The Train Safety Level Based On A Process Approach, A.Kh. Makhkamov, M.Sh. Valiev Aug 2020

Increasing The Train Safety Level Based On A Process Approach, A.Kh. Makhkamov, M.Sh. Valiev

Journal of Tashkent Institute of Railway Engineers

The article deals with improving the level of train traffic safety based on the process approach, provides a classification of failures of technical means and methods of their parry. The main attention is paid to the occurrence of cases of traffic safety violations. To increase the level of the DB support system, the entire process of organizing transportation is divided into four main blocks: management processes, resource support processes, production processes, interaction and control processes.

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Modernization Of The Crate Suspension Unit Of The Vl-80s Electric Carrier, G.А. Khromova, D.O. Radjibaev, S.A. Khromov, I.C. Kamalov Aug 2020

Modernization Of The Crate Suspension Unit Of The Vl-80s Electric Carrier, G.А. Khromova, D.O. Radjibaev, S.A. Khromov, I.C. Kamalov

Journal of Tashkent Institute of Railway Engineers

The article presents the development of a modernized design of a cradle suspension unit for an electric locomotive VL-80s with improved elastic-dissipative suspension properties with substantiation of dynamic and strength parameters. Numerical studies were carried out in the MathCAD 15 programming environment. For railway company is necessary to develop a new method of modernizing the cradle suspension of the VL-80s electric locomotive during overhaul repairs in order to improve the dynamic characteristics and increase the strength and reliability.

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Research Of Development Prospects Of Transportation Hub In Jsc "Umc", Marufdjan Xalikovich Rasulov, Sh.M. Suyunbayev, M.N. Masharipov Aug 2020

Research Of Development Prospects Of Transportation Hub In Jsc "Umc", Marufdjan Xalikovich Rasulov, Sh.M. Suyunbayev, M.N. Masharipov

Journal of Tashkent Institute of Railway Engineers

As you know, an increase in the volume of production of any object requires to reasonably provide for a comprehensive analysis of the compliance of its technical equipment and technology of work with the prospective traffic volumes. The article analyzes the existing and prospective volumes of work, shows the results of calculations, the available throughput capacity of the station. "B" - Art. "З" and the throughput of the receiving and departure tracks stations "Z", "P" and “S ", the required number of shunting locomotives has been determined, a number of measures have been proposed to improve the work of the …

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Application Of Fiber-Optic Communication Line Under Control And Monitoring Of Track Relays In Station Rail Circuits, Q.K Nuriddinov, Z.I. Mamedova Aug 2020

Application Of Fiber-Optic Communication Line Under Control And Monitoring Of Track Relays In Station Rail Circuits, Q.K Nuriddinov, Z.I. Mamedova

Journal of Tashkent Institute of Railway Engineers

This article discusses the problems of using a fiber-optic transmission line under control and monitoring the voltage of track relays in station rail circuits. A functional diagram of the fast and central equipment of a fiber-optic transmission line and their interconnection are shown. Several different network modules for organizing data transfer are considered. Comparative analyzes are given, problems that arise during the operation of network modules and their solutions are described. As a result of the analysis, the optimal version of the network module was selected and recommendations for developing its software are given

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Transfer Function Of A Traction Induction Motor Controlled By A Four-Quadrant Converter, As A Link Functional Diagnostics, M.C. Yakubov, Zh.S. Fayzullaev Aug 2020

Transfer Function Of A Traction Induction Motor Controlled By A Four-Quadrant Converter, As A Link Functional Diagnostics, M.C. Yakubov, Zh.S. Fayzullaev

Journal of Tashkent Institute of Railway Engineers

An expression for the transfer function of a traction asynchronous motor with a four-square converter is derived. It is shown that the basic properties of the traction motor, which are a four-square converter, correspond to the linearization coefficients. The values of linearization coefficients for a typical system in the entire region of equilibrium states.

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Dynamic Characteristics Of The New Three-Phase Current Unbalance Transformer Converter, Sultan Fayzullayevich Amirov, S.X. Zhumaboyev, N.R. Yuldashev Aug 2020

Dynamic Characteristics Of The New Three-Phase Current Unbalance Transformer Converter, Sultan Fayzullayevich Amirov, S.X. Zhumaboyev, N.R. Yuldashev

Journal of Tashkent Institute of Railway Engineers

The article examines the dynamic characteristics of a new transformer Converter for three-phase current asymmetry. It is shown that when a three-phase current is applied to the input of the Converter, its transient characteristic consists of the sum of the established sinusoidal and free components, which decay at a speed that depends on the time constant of the magnetic circuit of the Converter.

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Automatic Locomotive Signaling Parameters Devices On The Basis Of Microprocessor Elements, B.B Raxmonov, J.F. Kurbanov, J.E. Xidirov Aug 2020

Automatic Locomotive Signaling Parameters Devices On The Basis Of Microprocessor Elements, B.B Raxmonov, J.F. Kurbanov, J.E. Xidirov

Journal of Tashkent Institute of Railway Engineers

This article is devoted to an automatic locomotive signaling device associated with railway automation and telemechanics systems, ensuring the safety of train traffic. Wearable devices designed to test locomotive alarms are presented. Methods of measuring the magnetic field of the rails are described. A microprocessor-based digital decoder was developed for the special communication laboratory carriage. To improve the accuracy of the device, software and a wireless module were developed for storing the obtained measurement results and sending data online to the station's electromechanics. In the process, the following parameters are comprehensively determined: differential EMF, active resistance, quality factor and insulation …

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Substantiation Of The Input Of The Parameters Of The Unprofitable Loss Of Time When Norming The Time Of The Duration Of The Wagons On The Sorting Station, D.B. Butunov Aug 2020

Substantiation Of The Input Of The Parameters Of The Unprofitable Loss Of Time When Norming The Time Of The Duration Of The Wagons On The Sorting Station, D.B. Butunov

Journal of Tashkent Institute of Railway Engineers

Defining a new approach to accounting, analysis and reduction of unproductive losses in the operation of the sorting station. The methods of factor analysis are applied, the construction of a map of value creation flows. An expression is given for determining the values of unproductive losses in the operation of the station. The number of the causes of losses is determined, and they are grouped in order to solve the problem of overcoming the information gap in the analysis of the causes of losses. A flow map of the existing and proposed state of the carriage processing process at the …

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Development Of Algorithms And Methods Of Automatic Mode Of Electric Centralization System For Installing Routes For High-Speed Trains, B.B. Raxmonov, S.T. Boltaev, J.F. Kurbanov Aug 2020

Development Of Algorithms And Methods Of Automatic Mode Of Electric Centralization System For Installing Routes For High-Speed Trains, B.B. Raxmonov, S.T. Boltaev, J.F. Kurbanov

Journal of Tashkent Institute of Railway Engineers

At present, the CIS (Commonwealth of Independent States) has introduced an additional “high-speed traffic” regime in the electrical interlocking system to prepare routes for high-speed trains at stations. The use of a scheduled time notification restricts the movement of trains at stations and paralyzes all movements at stations and tracks before and after the passage of a high-speed train. To reduce this time, algorithms and methods were proposed for the automatic mode of the electrical interlocking system when establishing routes to stations, taking into account various categories of trains.

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Determining The Correction Factor For A Current Transformer With Automatic Range Control, Sultan Fayzullayevich Amirov, Sh.S. Mukhsimov, O.T. Boltayev, S.Kh. Zhumaboyev Aug 2020

Determining The Correction Factor For A Current Transformer With Automatic Range Control, Sultan Fayzullayevich Amirov, Sh.S. Mukhsimov, O.T. Boltayev, S.Kh. Zhumaboyev

Journal of Tashkent Institute of Railway Engineers

The article deals with the introduction of a correction factor for protection and control devices, since the value of the secondary current in one range does not correspond to the value of the secondary current in the other range, which is determined depending on the difference of the counter-directional MDS created by the components of the inter-counter-directional primary current of the current transformer. Also, an algorithm was developed to account for the measurement error in the automatic system that controls the operation mode of the current transformer. In addition, it was determined that the output data should be transmitted taking …

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