1Numerical Simulation and Field Research on Effective Radius of Gas Drainage with Drill Hole along Coal SeamCHEN Xue-xi, ZHANG Liang, CHEN Peng, ZHANG Kai1-52Prediction of Coal and Gas Outburst Based on CRITIC Method and Variable SetsGUO Jin-dong, ZHU Yun-hui6-103Mathematical Fitting Method Applied in Gas Concentration Research on Working FaceYU Bo11-144Experimental study on detection method of gas leakage in gas pipelineGAO Yan-zhong, BI Bo, XU Yong, HU Yan-kang15-185Discussion on determination of dust testing points in underground working faceWU Zi-guang, LI Tian-tian, MA Jun19-246Application Research on the Method to Solve the Problem of Seasonal Insufficient Cooling Capacity of Mine Cooling SystemZHANG Li-yang, YAN Yu-shan, LIU Chao25-297Using Potential Energy Measurement and SF6 Tracer Gas to Detect Air Leakage in Complicated GoafZHU Jian-fang, XU Yu-ming, GUO Wen-jie, DUAN Jia-min30-348Impact Analysis of the Occurrence Characteristics of Collapse Column on Fully Mechanized Caving MiningTIAN Chang-sheng, SHI Hao-yu35-38,429Water Control Measures and Safety Evaluation of Mining under Pressure of 4# Coal in Longquan Coal MineZHU Qing-wei, LI Xiao-ming39-4210Research on retaining waterproof pillar of collapse column in multiple colm seam of Chengzhuang Coalmine by the numerical simulation of FLAC3DLI Xiao-ming, LI Bo, ZHU Qing-wei43-4811Discussion on the selection of traction battery for auxiliary transport in coal mineHU Xing-zhi, LUO Jian-guo, ZHANG Li-yang, LI Xue-zhe, YU Rui-xiang49-51,5912Scouring fully mechanized coal face with technology researchZHANG Zhi-zhi, WANG Qing-hu, LI Han-wen52-5513Study on the relationship between tortuosity and permeability in porous mediaWU Jin-sui, HU De-zhi, GUO Jun-zhong, CHANG Hao-yu56-5914Summary of trace leakage detection technology for natural gas transmission pipeline based on TDLASHAO Xu, XU Jing-de, LI Hui60-6415Hardware Development of Motion Control Card Based on DSPZHANG Yu-jie, XU Chang-jie, FENG Hai-mei, LIU Chang65-6916Simulation of Metal Jet Penetrating into Coal Seam Based on LS-DYNAXU Jing-de, PENG Xing-li, QI Rui-chen, WANG Xiu-quan70-75,8217Experimental study on flame propagation characteristics of gas explosion pressure in medium scale pipelineSHI Xiao-liang, XU Sheng-li, XU Jing-de76-8218Research on MTPA Control and Simulation of Interior Permanent Magnet Synchronous MotorSHEN Bin, ZHANG Xiao-yu83-8719Functional Groups Analysis on Jurassic Coal of Inner Mongolia Based on Infrared SpectrometerCHENG Gen-yin, CHENG You, CAO Jian, FENG Shan88-9520Development of atmospheric environmental monitoring data audit and analysis systemTANG Ling, FANG Ruo-chen, LI Fu-ling, LI Yong-fei96-101 