1Situation and Analysis of Electric Speed Control Technique for Conveyers and PloughsFENG Jing-ruoDesign and Research1-42Technical Situation and Development Orientation of Powerful ShearerGAO Zhi-mingDesign and Research4-73Research on Level Regulation Algorithm of Shearer DrumLI Jun-li, LIAN Zi-sheng, LI Yuan-zongDesign and Research8-9,134Design of Measurement and Control System for High-voltage Distribution Device in Mine Based on Double CPUJIN Jiang, HU Shou-xin, CHEN Man-ping, WU Yu-zhuDesign and Research10-135Drive Error Analysis of Hypoid Gear in Cutting ProcessLI Jin, DEING Xiao-zhong, WU Liang-chenDesign and Research14-166Performance Comparation and Study of Single Centrifugal Fan and During Series OperationLI Shu-qiang, SHI Qing-xiang, YU Zhi-peng, LI Hua-jieDesign and Research17-197Analytic Study of Optimizing Site Selection of Large Pit Power PlantLIANG Dong-qing, CHEN Wen-hu, LI Jian-ping, LI Zhi-qiangDesign and Research19-218Design of Constant Pressure Control System in WaterworksWANG Yu-feng, ZHANG Peng, HE FeiDesign and Research22-249Design of Data Communication Circuit of Underground Power Supply Automation SystemLI Shu-wei, SHEN Zhan-binDesign and Research24-2610Design of Auto-antiskid Differential-Speed System for Wheel Engineering MachineryHUANG Pei, HUANG Qian, GU WeiDesign and Research27-3011A Study of PWM Rectifier for Double P Speed Control SystemLOU Dong-xiang, WANG Qing-ling, OU Lu-luDesign and Research30-3212New Loading Machine for MineWANG Dong, WANG Shu-yingIssue Discussion33-3413Design Features of Diesel-engine Mining Tyred VehiclesYANG Tao-renIssue Discussion35-3714The Application of Quadrate Nickel-hydrogen Cell to Miner's LampsCHENG Qiao-lu, Bu Yong-mingIssue Discussion37-3915Development of Ternary Gas Distributor of Concentration Autocontrol and Wide Flow RangeNI Chun-ming, QIAN Song, XIE Ping-fan, XU Chuan-bo, CHEN RongIssue Discussion40-4216Structural Analysis of Chain Wheel Module for Scraper Conveyors both at Home and AbroadMA LiIssue Discussion42-4317Performance Calculation of Double-cylinder Compound Secondary Linear MotorSHI Jun-liang, WANG Yu-qing, WANG Hai-xingIssue Discussion44-46,4918Coalmine Gas Monitoring System Based on SOPC TechnologySONG Gang, ZHOU Meng-ranIssue Discussion47-4919The Application of Industry Ethernet to Centralized Control System of Coal Preparation PlantYANG Dong-ping, LIU PengIssue Discussion50-5220Drilling Performance Analysis of Hydraulic RoofbolterMAO Jun, CHEN Hong-yue, WANG Li-liIssue Discussion52-54 