1Experimental Research on Premixed Methane-air Explosion Suppression with HeptafluoropropaneXUE ShaoqianTest Research5-82Experimental Research on Minimum Ignition Temperature of Mixed Dust in Coal-rock RoadwayGUO Kejing, LIU Jian, GAO Ke, HAN FangweiTest Research9-11,173Correlation of Ash Content, Volatile Matter and Porosity of Coal and Their Impact on Initial Speed of Methane DiffusionCHENG Bo, MA Daihui, GAO YueTest Research12-174Experimental Research on Compositional Analysis Method for Oxygen-containing Coal-bed MethaneLINGHU Lei, XIAO LuTest Research18-20,245Research on Dust Control Technology for Coal Mining Machine Based on Ejection Spray and Dust CurtainMA WeiTest Research21-246Study on Wetting Effect Improvement of Coal Dust with Compound Wetting AgentZHANG LiyingTest Research25-27,317Influence of Wall Roughness on Restricted Wall-attached Turbulent Jet in Excavation RoadwayGONG Xiaoyan, LI Gen, JIAO Wanying, MO Jinming, ZHANG Yongqiang, XUE XinyuTest Research28-318Research on Diagnosis Method for Gas Drainage Pipeline Network Running State Based on Pressure MeasurementLEI Baiwei, WU Bing, LI Xu, LIU ZhanyuTest Research32-35,529Study and Application of Temperature Distribution Field Model of Collapse Column Surrounding Rock under Action of Groundwater SeepageMIAO Bo, YANG Jun, WANG Fei, XU JinpengApplication Techniques36-3910Application of Partial Least Squares Regression for Calculating Height of Water Flowing Fractured ZoneHUANG Huan, JI YadongApplication Techniques40-44,6511Research on Noise Elimination of Coal Mine Gas Data Based on GA-LSSVRZHANG Wenjuan, HOU Yuanbin, ZHANG Wentao, LIU Mi, CHEN XianApplication Techniques45-48,6112CT Tomography Technology of In-seam Wave Velocity and Its ApplicationHE WenxinApplication Techniques49-5213Floor Heave Mechanism of Soft Roadway in Mining of Underlying Coal Seam and Its Control TechnologyZONG Yijiang, GAO JieTechnical Experience53-5714Improving Production Process to Reduce Power Module Failure RateZHU ZhengxianTechnical Experience58-6115Research on Reasonable Sealing Depth of Boreholes along Seam Based on Stress Zoning CharacteristicsWU JiaokunTechnical Experience62-6516Determination on Reasonable Coal Pillar Width for Pressure Relief and Outburst Elimination in Roadway Driving Along Next GobCHEN Caixian, SU Jing, TANG Zhu, SHI KaiyangTechnical Experience66-6917Application of Directional Drilling Technology in Water Control in Shendong Coal Mining AreaXU Feng, YANG MaolinTechnical Experience70-7318Research on "Delayed" Dynamic Disaster Control Technology Based on Microseismic MonitoringLIU YunpengTechnical Experience74-77,8219Study on Gas Control Technology in Slicing Mining of Thick Coal Seam Based on Different-source Prediction MethodZHANG Zhanguo, HOU ZhihuaTechnical Experience78-8220Analysis and Optimization Practice of Ventilation Resistance Determination in Fenghuangshan Coal MineZHANG Hongbin, GAO Junjun, LI YuchengTechnical Experience83-86,90 