1Technical Status and Development Direction of Coal Mine Dust Hazard Prevention and Control Technology in ChinaLI Dewen, SUI Jinjun, LIU Guoqing, ZHAO ZhengSpecial Column1-7,132Research on Algorithm of Dust Concentration Detection based on β-ray MethodLI Dewen, ZHUO Qinyuan, WU Fuxiang, ZHAO ZhengSpecial Column8-133Research on Extraction Technology of Pressure Relief and Outburst Prevention of Pre-drilling Floor Rock Lane in Deep Coal Lane StripCAO Jianjun, WANG Zhonghua, YANG HuimingTest Research14-194Study on the Layout of Roadway in the Working Face of Lower Layer in 5 # Coal Seam in Haihong Coal MineLIANG Bing, LI Cunzhou, WANG Beifang, SUN Weiji, CHI HaiboTest Research20-245Study on Reasonable Retention Width of Double Pillars in Multi-roadway Layout in Fully Mechanized Working FaceYANG Junzhe, SONG Guijun, FU Qiang, LIU QinjieTest Research25-29,346Study on the Influence Law of Underground Hydraulic Fracturing on Gas Content of Deep and Low Permeability Coal SeamSUN Peng, XU Lifeng, TANG JianpingTest Research30-347Research on the Mechanism of Floor Heave and Borehole Pressure Relief Technology in Deep Soft Rock RoadwayLU Jian, GONG Peilin, LI PengTest Research35-418Enhanced Extraction Technology of High Pressure Jet in Soft and Low Permeability Coal SeamYU BaozhongTest Research42-46,529Study of Permeability Evolution Model for Coal Containing Gas and Its Influencing FactorsGAO Han, GONG Xuanping, ZANG Jie, CAO Wenchao, CHENG XiaoyuTest Research47-5210Design and Implementation of Comprehensive Supervision Platform for Coal Mine Safety ProductionZHANG Peng, CHEN Yunqi, JIN NiqianjunDevelopment Design53-5611Study on Key Technology of Positive Pressure Bundle Tube Monitoring System for Predicting Coal Spontaneous Combustion in MineWANG Dong, LU Wei, LI Jinliang, XU ShuaiDevelopment Design57-6012Research on Stability Optimization of Deep Hole Fixed-point Sampling DeviceLONG QingmingApplication Techniques61-65,7113Research on Gas Prevention and Control Technology System of Rock Burst Coal SeamZHANG Zhanguo, MA Zhiyong, WANG ZhenApplication Techniques66-7114Study on Supporting Technology of Gob-side Roadway with Small Coal Pillar at Shallow Buried Depth Extra Thick Coal SeamGAO Feng, SHI Meng, WANG Zhanling, ZHANG TengApplication Techniques72-76,8315Logistic Regression Analysis Method for Identification of Mine Inflow Water SourceHOU Enke, FENG Dong, WEN Qiang, CHE Xiaoyang, GAO TaoApplication Techniques77-8316Optimization of Mine Single-wing Ventilation System based on VentsimXIN Song, HOU Chuanbin, JIN Xiaona, QIAN ZhibinTechnical Experience84-8817Study on Surface U-shaped Drilling Technology for CBM Extraction in Low-rank Thick Coal SeamCHENG Bo, LUO Huogen, ZHANG FengTechnical Experience89-92,9718Determine the Sensitive Index and Critical Value of Coal and Gas Outburst of Fracturing Coal MassZHANG ZhaoyiTechnical Experience93-9719Test and Analysis on the Effect of Elbow Guide Vanes on Diffusion Efficiency of Main Fan Vertical DiffuserDONG Zhanyuan, WU BiaoTechnical Experience98-10120Study on Failure Mechanism of Composite Structure of Roadway and Control Technology of Bolt-grouting SupportLIU Xueye, YAN Guochao, ZHANG YuanfangTechnical Experience102-106 