1Research on Selective Leakage-protection for Mine Low-voltage Electric NetworkZHANG Ling-ling, GUO Feng-yi1-32Design of KZG-1 Centralized Monitoring System for Belt Conveyor in Full Coal MineWANG Hai-yang4-6,103The Investigation of Applying Dual Tone Multi-frequency to Underground Data Transmission in MineLI Yang-ming, HAN Jiang-hong, JIN Hao7-104Applying CCD Technology to Measure and Calculate Diameter of Hoist RopeWANG Guang-feng, PAN Hong-ge, ZHONG Hai-na, XU Hong-qiang11-135Reactive Compensation System Based on DSP Intelligent MonitoringWANG Yu-feng, ZHANG Lan-fen13-156A Study of Automatic Monitoring and Control System for Main VentilatorsZHAO Chao-yang, HU Yong-jun, LI Chang-jiang16-197Control System Design of Concrete Pump/Wet-sprayerDING Hong-chang, FAN Bing-hui, WANG Chuan-jiang19-218A Design of Intelligent Calculation Scheme Used in Mining Power Network SettingFENG Xin-jun22-259Realization of Classified Short-message Warning During Gas Concentration in Coal Mine Beyond LimitMIN Xiao-yong, LEI Yu-yong25-2810Estimation of Maximum Permissible Capacity for Starting Motor from Electric NetworkXU Dun-ang, FAN Zheng-sheng, JIANG Cha-shui29-3111Electric Safety of QC83 Series Mining Flameproof Magnetic StarterLU Bao-zang, LU Yang-chun32-3312The Development of Monitoring System for Mine Hoist RopeLi Huai-lun34-35,3813The Ferrograpy Analysis Technology of Debris GroupYANG Zhi-yi, LI Hao-ping, CHENG Yu-sheng36-3814The Application of Ferrograph Analysis Technology in Shendong CollieryZHANG Zeng-yu, LI Yun39-4115Relay Protection Measures of 6 kV Transmission Network for Coal MineLI Jing-jie41-4316Oil-pressure Calculation of Hydraulic Station for Hoister Braking SystemCHEN Hong-wei44-4717Simulation of Shearer Based on Virtual PrototypingYANG Li-wei, WANG Chong-jian, FENG Jing-ruo47-4918Over-voltage Precaution of Mining Transmission NetworkSHAN Zhi-ru50-51,5419Graphical Design Method of Mechanism Based on AutoCADTAO Xi-hai52-5420Digital Reconstruction of Analogue System for Colliery Auxiliary Shaft HoistZANG Chao-wei, LI Hong-hui, FENG Gao-ming55-57