1Influence of Gravity Center on Stability of Longitudinal RoadheaderLI Xiao-huo, LIU XueDesign and Research1-22Intelligent Microprocessor Protector's Design of Mining Ex-Proof Vacuum Feed SwitchKONG De-quan, CHGNG Guo-hui, LI Zhan-ping, LI Jian-shuDesign and Research3-4,73Design of Coal Mine Safety Monitoring System Based on Sensor NetworkLI Yu-guoDesign and Research5-74A New Measuring and Controlling System of Mine Magnetic Starter with Intelligent Synthetic ProtectionGUO Zhi-gang, QIAN QiangDesign and Research8-105Research of high-powered multifunctional Tester for Soft-StarterZHANG Bo-chao, LIU Chen-yangDesign and Research11-136Fuzzy Optimization Design of Worm TransmissionCHENG Zhao, WANG De-sheng, WANG YuDesign and Research13-157Optimal Design of Transmitting System of Mid-speed Mill Based on MATLABWANG Fu-rong, XUE Tong-longDesign and Research16-178The Application of Double-feed Speed Regulation to HoistLUO Shu-ke, FENG Gao-mingDesign and Research18-20,249Embedded Design of Mining Portable AuchordetectorXU Zhao, XI Yan-hua, YANG YingDesign and Research21-2410The Development of New Flame-proof High-voltage Vacuum Distribution Equipment for MineYANG Wei-yiDesign and Research25-2711Design of Energy Saving Hydraulic SystemLI Chong-shu, DA Zi-zhenIssue Discussion28-2912Enclosure Strength Design of Mining Flame-proof Electrical ApparatusQIAN Song, NI chun-mingIssue Discussion30-3313Reliability Design of PLC Control System of Mine HoistQIN Xu-pingIssue Discussion33-3514Analysis of Magnetic Field in Slotless Permanent Magnet Linear Synchronous MotorLIU Hao, SHANGGUAN Xuan-feng, YUAN Shi-yingIssue Discussion36-3815Analysis and Application of Fault Diagnosis Technology for Hydraulic SystemsLI Xin-ping, SHI Qing-guo, GE Yun-yanIssue Discussion39-4116The Research of Coal-mine Gas Concentration Prediction System Based on Artificial Neural NetworkFU Lin-yan, HUA GangIssue Discussion41-4317Think about Restrictive Factors and Development of Quality ManagementFENG JieIssue Discussion44-4618Economic Operation Analysis of Mine Main VentilatorXIE Qi-dongIssue Discussion46-4819Analysis of Hydraulic Systems for RoadheaderZHANG JunIssue Discussion49-5120Lectotype of Coal-plough on Plough/Conveying Speed RatioTANG Huan-yongIssue Discussion52-53 