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Test particles and quasiperiodic oscillations around Kiselev black hole with cloud of strings

Chinese Physics C 2024年第5期48卷 293-308页

作者： Javlon Rayimbaev Uktambek Eshimbetov Bushra Majeed Ahmadjon Abdujabbarov Alisher Abduvokhidov Bakhrom Abdulazizov Akram Xalmirzayev School of Mathematics and Natural Sciences New Uzbekistan UniversityMovarounnahr Str.1Tashkent 100000Uzbekistan School of Engineering Central Asian UniversityTashkent 111221Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan National University of Uzbekistan Tashkent 100174Uzbekistan Ulugh Beg Astronomical institute Astronomy Str.33Tashkent 100052Uzbekistan Tashkent State Technical University Tashkent 100095Uzbekistan College of Electrical and Mechanical Engineering(CEME) National University of Sciences and TechnologyRawalpindiPakistan Andijan State University Universitet Str.129Andijan 170100Uzbekistan namangan State University Boburshoh Str.161Namangan 160107Uzbekistan

In the present study,we investigate the dynamics of test particles around a Schwarzschild black hole surrounded by quintessence and immersed in a scalar string cloud *** start our study by defining the possible values of the quintessence and cloud of string parameters corresponding to the existence of the black hole horizon for fixed values of the parameters of the equation of state for dark *** also study the effects of the effective potential on the circular motion,energy,and angular momentum of the test particles together with the innermost stable circular orbits(ISCOs).We investigate the fundamental frequencies in the particle oscillations along stable circular *** relate the stability of the orbits to the Lyapunov exponent,and the chaotic behavior is studied ***,we apply the fundamental frequencies to describe quasiperiodic oscillations(QPOs)and find that,in the presence of both fields,low-frequency twin-peak QPOs are not *** addition,we obtain the constraint values for the string cloud parameter and mass of the black hole candidates located in the center of the microquasars GRO J1655-40 and GRS 1915+105 as well as the Milky Way galaxy.

关键词： quintessential field black holes string cloud quasiperiodic oscillations

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Theoretical and Practical Studies of Determining the Force of the Lifting-Lowering of the Roll Box

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Engineering（科研） 2023年第1期15卷 47-57页

作者： Usmonov Shuxratjon Kamoljonovich namangan institute of engeenering and technology Namangan Uzbekistan

The lifting and lowering mechanism of the roll box of the saw gin, being an integral part of the ginning process, is used when starting the electric motor of the saw cylinder until its rated speed is reached to prevent an increase in the load current on it, as well as to start the ginning process. The article defines the kinematics of the movement, and also studies the regularity of the movement of the roll box of the saw gin when lifting it with the help of a pneumatic drive. The kinematics of the roll box movement was determined through experimental studies. Knowing the equation of motion, using the second-order Lagrange equation, the regularity of the change in the lifting force of the roll box was determined. Here the system is closed, its degree of freedom is equal to one. The angle of rotation of the roll box is taken as a generalized coordinate. Numerical results were obtained using the Matlab software environment. The theoretical analysis and graphs for determining the lifting force of the roll box are presented. To study the kinematics of lifting the roll box, a method and a test bench have been developed. According to him, when the roll box was raised, its movement was recorded on video, the image was processed using the After Effect and CorelDraw programs, and the movement of the rod attachment point to the roll box was determined. And also the equation for changing the angle of rotation of the roll box is determined using the Matlab Curve Fiting program.

关键词： Saw Gin Roll Box Pneumatic Cylinder Rod Angular Velocity Angular Acceleration Gravity Forces Driving Force Moment of Inertia Function

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Methods for Reducing Seed Damage in the Technological Process of Cotton Processing

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Engineering（科研） 2022年第3期14卷 119-130页

作者： Muradov Rustam Isakhanov Khamidullo Khosimov Khusanboy namangan institute of Engineering and technology Namangan Uzbekistan

The article describes the transfer of cotton to the next technological process while preserving its natural properties during the initial processing process. The analysis of methods of reducing impact forces when remo... 详细信息

关键词： Cotton Pneumatic Transport Separator Fan Pipe Cyclone Stone Holder Auger Solenoid Vertical Pipe Blade Drum Cleaner Mesh Surface Shaft Vacuum Valve Discharge-Separator Volumetric

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About the Change in Air Pressure in the Pipeline during the Pneumatic Transportation of Cotton

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Engineering（科研） 2022年第7期14卷 228-234页

作者： Farhod Kholmirzaev Maftuna Yusupova Abdul-Malik Kayumov Olimjon Sarimsakov namangan institute of Engineering and technology Namangan Uzbekistan

The article is devoted to the study of the issues of determining the patterns of changes in air pressure along the length of a pneumatic transmission pipeline for raw cotton at different flow parameters and different pipeline diameters. Theoretical studies have proved the reduction of static and total pressure along the line of pneumatic cotton transportation. The dependence of the pressure change on the diameter of the transport line and the aerodynamic drag of the pipeline is obtained. The results obtained are recommended for use in the design of raw cotton pneumatic transport systems.

关键词： Pneumatic Conveying Pipeline Raw Сotton Air Pressure A Fan

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Study of Cotton Seeds as a Processing Material

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Engineering（科研） 2023年第11期15卷 782-791页

作者： Akhmedxodjayev Khamit Tursunovich Tadjibayev Muhammad Ahmadjanovich Sharipov Khayrullo No’monjanovich Juramirza Abdiramatovich Kayumov Abduraximov Komiljon Karimovich namangan institute of Engineering and technology Namangan Uzbekistan

The purpose of this research is to improve the qualitative and quantitative indicators of fiber, lint and seeds by improving the technology of preparing cotton seeds for processing. The state of the seeds after the gin was studied and their division into fractions according to the degree of pubescence was recommended, the probabilities of the seeds emerging from the gin with varying degrees of pubescence were investigated, the geometric sizes and shapes of cotton seeds were studied. It has been established that when seeds come out of gin, they have different pubescence. The conditional movement of seeds without separation from the surface has been determined;found a formula describing the movement of seeds without detaching from the surface;the movement of seeds in a micro-flight is determined;the sizes of the cells of the mesh surface were determined as a function of d_c, α and on the speed of seed movement. The aim of the research work is to increase the yield of cotton fiber by improving the processing technology of germinated seeds, to improve the quality indicators of seeds and lint. In order to achieve this goal, a mesh surface device was created to sort the seeds into fractions. Sorting technology was developed on this device and operating modes were determined. In addition, the law of surface distribution of the fractions separated from the cotton stream moving along the surface of the net was determined, and based on the results of practical and theoretical research, a mode of sorting of cotton seeds was developed.

关键词： Fiber Lint Raw Cotton Ginning Saw Gin Working Chamber Raw Grate Linting Cotton Seeds

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Improving Fiber Quality Output by Improving the Roll Box of the Gin Saw

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Engineering（科研） 2023年第4期15卷 261-268页

作者： Sarimsakov Akramjon Isroilov Sardorbek Komilov Shukhratjon namangan institute of Engineering and technology Namangan Uzbekistan

It has been proven that the increase in the productivity of the gin machine necessarily occurs along with the increase in the density of the raw material. However, with increasing density, productivity increases up to a certain limit, and then productivity begins to decrease. In this article, the authors analyzed the scientific work on improving the quality of fiber.

关键词： Cotton Fiber Saw Gin Density Saw Drum Seed Husk Seed Fluff

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Influence of the Mode of Discrete Drum Speed and the Number of Inputs on the Technological Parameters of the Yarn Produced

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Engineering（科研） 2022年第12期14卷 536-543页

作者： Yuldashev Jamshid namangan institute of Engineering and technology Namangan Uzbekistan

This article is devoted to the research work aimed at improving the quality of yarns obtained by pneumomechanical spinning. The yarn quality indicators obtained at different speed modes of the pneumomechanical spinning machine discrete drum were studied and analyzed. The effect of the number of incisions of the sawtooth coatings on the discrete drum on the quality indicators of the yarn produced was also studied. The results of the experiments were analyzed by graphical and histogram methods, and alternative options were suggested.

关键词： Fiber Yarn Discrete Drum Quality Text Toughness Speed

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Determination of the Influence of the Speed of the Saw Cylinder of the Saw Gin on the Density, Speed and Composition of the Seed Roll

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Engineering（科研） 2022年第3期14卷 131-137页

作者： Akmal Umarov Hamit Akhmedhodjaev Kamola Ortiqova Zohida Nasriddinova namangan institute of Engineering and technology Namangan Uzbekistan

The article consists of studying the influence of the speed of the saw cylinder on the quality of the fiber and the productivity of the machine, as well as on the change in the density and composition of the seed roll.

关键词： Seed Cotton Ginning of Cotton Saw Gin Stand Roll Box Seed Roll Profile of the Roll Box Speed of the Feed Rolls Density of the Seed Roll

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Determining the Optimal Parameters of an Advanced Linter Machine

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Engineering（科研） 2023年第12期15卷 810-820页

作者： Obidov Avazbek Azamatovich A.J.B. O’g’li Qosimov Axtam Akramovich Department of Technological Machines and Equipment Namangan Institute of Engineering and Technology Namangan Uzbekistan Department of Metrology Standardization and Quality Management Namangan Institute of Engineering and Technology Namangan Uzbekistan

In this article, research was conducted to improve Linter machines that remove short fibers remaining in ginned cotton seeds at cotton ginneries. The study examined the effect of changing the dimensions of the brush drum, guide and mesh surface in the cleaning device proposed for the linting machine on the movement of the peg and the cleaning efficiency, and the highest level of efficiency in separating impurities from the peg was determined. During the study, the main factors influencing the effective operation of the improved linting machine were identified, the limits of their values were determined, and studies were carried out using the mathematical modeling method. As a result, at the values of the given coefficients, efficient operation of the improved linting machine was observed, that is, the lint cleaning efficiency reached 55.1%.

关键词： Linter Machine Fluff Impurities Cleaning Efficiency Lint Brush Drum Guide Mesh Surface Input Factors Output Parameters Working Element Tilt Angle Speed

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Investigation of Changes in Flow Parameters along the Transport Line in Installations for Pneumatic Transport of Cotton

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Engineering（科研） 2022年第1期14卷 76-83页

作者： Mahfuza Gapparova Bahrom Mirzaev Mutalov Muhammadodil Olimjon Sarimsakov Tashkent institute of Textile and Light Industry Namangan Uzbekistan Fergana Polytechnic institute Namangan Uzbekistan namangan institute of Engineering and technology Namangan Uzbekistan

The article presents the results of a study of changes in the parameters of the flow, velocity and pressure of air along the cotton transportation line in pneumatic transport installations and their dependence on the parameters of the pipeline. The purpose of the research is to theoretically substantiate the choice of the pipeline diameter depending on the properties of the material (cotton), the required processing capacity and pipeline throughput. In the research, an analytical method was used to study changes in the pressure of the air flow along the transportation line at different pipeline diameters. It is established that, according to the existing calculation method, the flow pressure along the transportation line is reduced to zero. At the same time, various scientists have proposed various analytical and empirical dependencies, which, in turn, give different ideas about the resistance of the inner surface of the pipes to the movement of air and material flow and do not describe the real situation, especially when transporting material from a long distance. This requires in-depth theoretical and applied research to establish real patterns of changes in flow parameters along the material (cotton) transportation line.

关键词： Cotton Pneumatic Transport Installations Flow Parameters Static Dynamic and Total Pressure

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