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American Journal of Scientific Research and Essays

Scientific Research and Essays, Recent Articles

Force and Control Measures of Pulverized Coal Migration in Coalbe-d Methane Horizontal Wells

Research article of American Journal of Scientific Research and Essays Force and Control Measures of Pulverized Coal Migration in Coalbe-d Methane Horizontal Wells ZHANG Beibei1, SHEN Junping2, ZHANG Jin3*, SHEN Shuxing4, ZHANG Mingshan5 1School of Earth Science and Engineering, HUE, School of Hebei University of Engineering, Handan 0560382, China; 2Aksu Industrial Vocational and Technical College, Aksu, 842000, China; 3College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; 4 Aksu No. 17 Middle School, Aksu, 843000; 5Zhengzhou Zhencheng Energy Technology Service Co., Ltd., Zhengzhou 450018, China. Pulverized coal production is a common problem in the process of coalbed methane drainage and production, which is one of the key factors restricting the continuous stability drainage and production of coalbed methane. The reasons and characteristics of pulverized coal output are summarized. Through a detailed analysis of the migration and stress of pulverized coal in the borehole, the migration of pulverized coal is controlled by the stress conditions of pulverized coal, which causes the migration position of pulverized coal to change. Under the action of total pressure difference ΔF, pulverized coal particles can be divided into three situations: downward inclination, upward inclination and near horizontal migration. Finally, a solution to the control of pulverized coal is put forward from two aspects: the control of drainage and mining system and the selection of drainage and mining equipment. The research shows that continuous stability drainage and mining is the key of drainage and mining system, and controlling the hydrodynamic difference ΔF is the means to control the migration of pulverized coal. Choosing a pump with strong adaptability to pulverized coal is beneficial to coalbed methane drainage and production and increase productivity. Two horizontal wells in Shizhuang South Area 2 were replaced by membrane pumps, and the diaphragm pump system guide cover scheme was adopted. The coalbed methane production increased by about 1000m3/d, and ...
Scientific Research and Essays, Recent Articles

Graphite mine and mineral assemblage of surrounding rock and its indicative significance to metamorphic facies

Research article of American Journal of Scientific Research and Essays Graphite mine and mineral assemblage of surrounding rock and its indicative significance to metamorphic facies Haihua Li1, Ye Su2, Litao Qin1,3, Junjie Ma1, Bohui Xu1,4* 1School of Earth Science and Engineering, Hebei University of Engineering, Handan, Hebei 056038, China. 2Second Geological Team of Hebei Coalfield Geological Bureau (Dry hot Rock Research Center of Hebei) Geology Department, Xingtai, Hebei 054001, China. 3Second Hydrogeological Team, China’s Coal Geological Administration, Xingtai, Hebei 054000, China. 4College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China. The different metamorphic mineral assemblages can reflect the difference of metamorphic temperature and pressure and determine the different metamorphic facies. The identification and determination of the occurrence of characteristic metamorphic minerals and the symbiotic association of typical metamorphic minerals can determine the metamorphic phase of graphite and its surrounding rock, and further infer the formation conditions of graphite. In this paper, the mineral assemblage relationship of a graphite deposit and its surrounding rock in the south of Hebei province is studied by means of microscopic observation and Electron Probe Micro Analysis (EPMA), and the metamorphic facies of the graphite deposit and the temperature and pressure conditions of the deposit are deduced. The study shows that the metamorphic facies of the graphite deposit is low amphibolite facies and the ore-forming conditions are medium temperature and medium pressure. Keywords: Graphite, Electron microscope, Metamorphic facies, Metamorphism ...
Scientific Research and Essays, Recent Articles

Design and Implementation of an Eye-Controlled Self-Driving Wheelchair

Research article of American Journal of Scientific Research and Essays Design and Implementation of an Eye-Controlled Self-Driving Wheelchair Hatem Al-Doais*, Farouk A. K. Al-Fuhaidy*, Ahmed T. Al-Oqabi**, Esmail A. Qasabah**, Ahmed A. Zabarah**. *Ibb Univ, **Sanaa University The purpose of this paper is to develop a mechatronic system, the Eye-Controlled Self-Driving Wheelchair (ECSDW), that can help paralyzed, handicapped or any peoples who have an injury in their upper part of the body to be easily and successfully navigate autonomously from one position to another within indoor environments while avoiding obstacles dynamically. This research aims to present a unique approach which can be achieved inexpensively and has the eye-controlled additional property with robust autonomous assistive navigation when compared to a commercial existing wheelchair. The proposed ECSDW system platform is capable of localization and mapping, as well as robust obstacle avoidance, using only a commodity RGB-D sensor and wheel odometry. The development of the proposed ECSDW system was firstly carried by simulating the navigation of the wheelchair using Gazebo and Rviz running in ROS. Secondly, the hardware was assembled and built and the ROS nodes were implemented using Python programming language. Finally, the GUI was designed and implemented for a custom map so that, the disabled user can stare to a specific location using the GUI, with the help of eye-tracker sensor, which accepts directed eye signals and direct the wheelchair to navigate to the desired position autonomously. Keywords: Eye-Tracking,Self-Driving,Odomtry,ROS, Gazebo, SLAM, Qt ...
Scientific Research and Essays, Recent Articles

Effects of Radiation and Heat Generation on Magnetohydrodynamic Free Convection Flow along a Horizontal Cylinder with Conduction

Research article of American Journal of Scientific Research and Essays Effects of Radiation and Heat Generation on Magnetohydrodynamic Free Convection Flow along a Horizontal Cylinder with Conduction K. M. Safiqul Islam1, M. A. Alim2 and Md. Rezaul Karim3 1Department of Mathematics, Gowripur Govt. College, Mymensingh 2Department of Mathematics, Bangladesh University of Engineering and Technology, Dhaka -1000, Bangladesh. 3Department of Mathematics, Jagannath University, Dhaka-1100, Bangladesh In this paper, the flow characteristics and the heat transfer process due to natural convection and conduction along a horizontal cylinder in presence of radiation, magnetic and heat generation effects are examined. The effects of radiation, magnetic and heat generation on electrically conducting fluid in natural convective flow along a non-linear system of partial differential equations is reduced to local non-similar horizontal cylinder with conduction have been studied in this paper. The governing boundary layer equations for this phenomenon are transformed into a non-dimensional form and the resulting partial differential forms by adopting appropriate suitable transformations. The transformed boundary layer equations are then solved numerically by using the implicit finite difference method. Numerical results of the velocity profiles and temperature distribution, coefficient of local skin friction and local rate of heat transfer distribution for the Prandtl number, radiation, magnetic and heat generation parameters are presented graphically. Detailed discussion is given for the effects of the aforementioned parameters. Significant effect is found in heat transfer distribution for Prandtl number and radiation parameter. The thermal boundary layer thickness of Prandtl number is clearer than radiation parameter. Important effect is found in heat transfer distribution in Heat Generation effect. An excellent graph is found in magnetic effect for heat transfer profile, which is as like as a spiral situation. Keywords: stream function, free convection, cylinder, Prandtl number, Grashof number ...

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American Journal of Scientific Research and Essays1

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