1Study of High Water-base Hydraulic Valve Based on CFD and BPF TechniqueZHANG Hong, LIAN Zi-sheng, XIONG Xiao-yan, ZHAO Guo-dongDesign and Research1-3,72Applied Research of Mine Wireless Communication System Based on nRF2401ZHANG Wen-xiang, MA Yin-Hua, RU Yan-DongDesign and Research4-73Study on Low Current Ground Wire Selector of Electric NetworkLI Shu-wei, PENG Qiu-hongDesign and Research8-114Design of Temperature Control System for Box Heat Treatment FurnaceZHANG Jing, WU boDesign and Research11-135Design of Wide-range Speed Regulating System for DC MotorLI Hong-ying, HE Hai-qingDesign and Research14-166Analysis of Causes and Solutions of Arch-forming in Coal BunkerXIAO Lin-jing, LI Zhen-hua, XIAO Hong-binDesign and Research16-187Design and Application of Monitoring System to Mine Water TreatmentCUI Dong-feng, ZHOU Ru-lu, ZHU Liu-sheng, ZHANG Yi-longDesign and Research19-20,238Study of New Slip-limited Differential SystemCHENG An-ning, JIA Ai-qin, HUANG PeiDesign and Research21-249μs- grade Adjustable Pulsed Power Supply UnitCHEN WeiDesign and Research24-2610Mathematic Auto-steering Model of ShearerZHANG Wei, ZHANG Fu-jianDesign and Research27-2911Technological Design of High-voltage Shielded Rubber Jacket Flexible CableLUO Jian-minDesign and Research29-3112Design of Synchronizing Control System for Hydraulic Jack of Pipe-jacking MachineJIA Chao-yangDesign and Research31-3313Development of Mechanical Coal-getting Equipment for Thin SeamsBI Jin-mingIssue Discussion34-3514Dynamic Analysis of Large-size Shotcrete Robot Based on ADAMSPAN Xin-an, FAN Bing-hui, SU Xue-chengIssue Discussion36-3815Direct Torque Control MethodIssue Discussion38-4016Weak Signal Detection of Vertical Elevating System for Permanent Magnet Linear Synchronous MotorFU Zi-yi, ZHANG Dong-fengIssue Discussion41-4317A New Explosion-proof Lighting Fluorescent Lamp for MineLUO Han-pingIssue Discussion43-4518Analysis of Prevention and Control Methods of Ferromagnetic Resonance Over-voltageMA Xin-yu, YAN Feng-HuaIssue Discussion46-4919Study of MAAG Pre-grinding Hob with Undercut Tooth-profileDAI Jian-pingIssue Discussion49-5120The Monitoring System of Gas Concentration of MineLI Wen-jiang, LI Kun, HAN YingIssue Discussion52-54 