1Determination of Drainage Effective Radius of CO2 Phase Transition Fracturing Based on Time-source MethodSUN Zhuoyue, YANG Dong, PEI Yue, SUN Liuwei, MA XiaominTest·Research1-5,112Research on Dynamic Index of Coal Seams Area Based on Water Jet SlottingLIU Jian, JIANG Wenzhong, REN Zhongjiu, LIU ZiwenTest·Research16-223Experimental Study on Suppression of Coal Dust Combustion by Inert MediumGU Gongtian, WANG Fei, WANG Cheng, HAN JinxinTest·Research28-31,374Effect of Pressure Relief and Permeability Increase of Bottom Layer of Protective Layer in Low Permeability Coal Seam of Gaoshan MineLIU Yutao, XIN Liankai, CHEN ZhiyongTest·Research32-375Study on Precursor of Infrared Temperature Critical Slowing in Coal Sample Uniaxial Compression FailureTIAN He, LI Zhonghui, YIN Shan, CHENG Fuqi, WEI Yang, ZHANG XinTest·Research38-436Study on Paleogene Rock Structure Characteristics and Integrated Water-resistance Performance in Yilan Mining AreaLYU De, XIE YuxiangTest·Research44-477Study on Destruction Characteristics of Surface Vertical Wells in Mining Area of Sihe Coal MineHAO Guocai, HU Shengyong, GUO Xiangqian, LI Chao, ZHANG Ao, HAN Dandan, HU Lanqing, HU Jiangliang, HU FeiTest·Research48-51,578Influence of Nano-particles on Durability of Shaft ConcreteLI Ran, WEI HuirongTest·Research52-579Influence of Gangue Compaction Process on Coal Pillar Supporting Pressure in GoafWANG Lei, CAO Hengjiang, JIANG Zilong, WANG TongxuTest·Research62-6810Preparation and Crack Resistance Test of High Performance Concrete with Fiber Hybrid and Micro Expansion Freezing Shaft LiningKONG Weihao, YANG Long, YAO Zhishu, XUE Weipei, GAO CongTest·Research69-7411Prevention and Control Technology of Spontaneous Combustion in 8102 Fully-Mechanized Mining Face of Xinwei MineRAO Zi, WANG Shuai, HU Lei, TANG HuiTechnology·Innovation84-8712Research Status on Prevention and Control Technology of Coal Spontaneous Fire in ChinaZHU Hongqing, HU Chao, ZHANG Yongbin, HU Lintao, YUAN Xiaole, WANG XiaokuanTechnology·Innovation88-92133D Virtual Mine Simulation System Platform Based on NeoAxis EngineHONG Yuling, WANG YangyangDesign·Development100-10314Application of Micro-Seismic Monitoring System in Dangerous Area of Water Inrush in Zhangji Coal MineLIU Xiaoguo, WEI Tingshuang, YU Guofeng, WANG Sixu, HAN Yunchun, MU Wenqiang, LI LianchongDesign·Development111-11415Drilling Water Level Intelligent Monitoring System Based on Narrow-band Internet of ThingsYAN Maoyin, XU Lenian, HUAN ZhihaoDesign·Development115-11816Centralized Drainage Technology and Application of Vertical Shaft in Low Permeability Thin Coal Seam Downward DrillingCHEN Hu, DENG MingmingApplication·Practice133-136,14317Mechanism and Prevention of Rock Burst Induced by Wide Coal Pillar in Thick Hard Coal SeamLIU Weijian, MA BinwenApplication·Practice148-15218Application of Transient Electromagnetic Method in Detection of GoafSUN Yingfeng, LUO Xiao, GAO Yirui, WANG Pengpeng, DONG Chuanlong, HE YongchangApplication·Practice157-16319Feasibility of Perforating Charge Penetrating Coal Seam Based on LS-DYNAZHOU Jie, WANG Fengying, AN Wentong, ZHAO Jiajun, MA ShihaoAnalysis·Discussion164-16720Present Situation and Prospect of Research on Prevention and Control Technologies of Coal Mine Goaf Instability DisasterWANG Donghao, LI Wen, ZHANG BinAnalysis·Discussion188-193 