1Numerical Analysis of Coal Breakage Process and Stress Change Law Under High Pressure Water JetJIANG Yifeng, DU Feng, LIU Ang, WANG Liang, XIN ChengpengTest Research1-5,112Effect of Mechanical Property on Acoustic Emission Activity of Coal during Failure ProcessYANG Huiming, ZHANG MingmingTest Research6-113Experimental Study on the Effect of Hydraulic Fracturing on the Stress of Coal SeamCUI Cong, ZHANG LangTest Research12-16,214Study on the Influence of Coal Pillar on the Pressure Relief and Outburst Elimination of the Upper Protective Layer MiningKANG JiandongTest Research17-215Temporal-Spatial Relationship between Ground Fracturing and Underground Gas Extraction in Jincheng Mining AreaSHEN KaiTest Research22-26,316Prediction of Supercritical Methane Adsorption in Deep Coal SeamCHAI Lin, WU Shiyue, NIU Yu, WEI JieTest Research27-317Optimization of Dynamic Nitrogen Injection Parameters in Fully Mechanized Working Face of Liuzhuang Coal MineYU Cong, TANG Mingyun, ZHANG Ruiqing, DAI GuanglongTest Research32-368Experimental Study on Calibration of Calculation Formula of Gas Content in Coal Seam by Indirect MethodLEI Hongyan, PANG Jinlun, CHEN Yutao, CAO JieTest Research37-409Study on the Technology of Dust Control in Artillery Working FaceFENG Yong, ZOU Changfu, YANG Fangfang, SUN Qifei, LUAN XudongTest Research41-43,4810Pipeline Experimental Study on Suppression of Gas Explosion by Explosion Proof Water CurtainZHOU Xihua, GUO KunTest Research44-4811Study on the Influence of Water Injection Pressure on Wetting Radius of Coal Seam Based on ComsolHUANG Tengyao, ZHOU Xiaohua, HU Yanwei, SONG XiangTest Research49-53,5812Design and Calibration of Small Size Storage MWD InclinometerKANG HouqingDevelopment Design54-5813Design and Implementation of Performance Detection System for Underwater Breathing ApparatusJING tingtingDevelopment Design59-6214Design of Impulse Current Suppression Circuit for Power Frequency TransformerLI XiangheDevelopment Design63-65,6915The Application Research on the Quality Inspection Method of Sealing and Drilling of Gas Drainagein Duanshi Coal MineZHOU JunApplication Technology66-6916Fuzzy Comprehensive Prediction and Evaluation of the Water Abundance of Coal Measures Sandstone Aquifer—Take Qihan of Wolonghu Coal Mine for ExampleZHANG Hongmei, WU Jiwen, ZHAI Xiaorong, SHEN ShuhaoApplication Technology70-74,7917Prediction of Coal Mine Dustproof Water Consumption Based on the Combination of Wavelet Analysis and GM(1,1)-ARMA( p,q)DENG Quanlong, JIANG Zhongan, HAN ShuoApplication Technology75-7918Research and Application of Water Injection Technology for the Ultra-Thick Coal Seamin Fully Mechanized Working FaceLIU kuiApplication Technology80-8319Research and Application on the Unpowered Dust Removal Technology for Belt Conveyor Coal Handling System in Alpine RegionZHANG Jiangshi, LIU Jinfeng, WANG Yameng, YANG Xuesong, ZHU Yingying, CHEN ZhanguoApplication Technology84-8820Determination of Reasonable Size of Segment Coal Pillar in High Gassy Fully Mechanized Working FaceSU Chao, LU Jian, GUO MengTechnical Experience89-92,97 