1Low Production Mechanism of Coalbed Methane in Soft and Low Permeability Coal Seam of Zhaozhuang BlockJI Changjiang, XIN Kai, YANG Changyong, CHANG Huizhen, TIAN Qingling, JIA JinshengTest·Research1-52Study on Gas Drainage Characteristics Based on Permeability Anisotropy of CoalZHANG Wei, ZHENG Chunshan, XUE Sheng, JIANG Bingyou, WANG Zhigen, LIU Jian, WANG YongTest·Research6-11,163Mathematical Model of Desorption Curve and Desorption Gas Content Test Method for Low-rank Coal SamplesWANG Lei, LYU Yahui, WANG CongTest·Research12-164Influence of Electrochemical Modification on Adsorption and Desorption Characteristics of Lean Coal GasLIU Yanze, KANG Tianhe, ZHANG Xiaoyu, KANG JiantingTest·Research17-215Study on Non-darcy Seepage Mechanism of Gas Migration in CoalWEI LeTest·Research22-256Characteristics of Gas Adsorption Kinetics of Coal Particles with Different Sizes Based on Dual Combined First-order Rate FunctionMA JinkuiTest·Research26-307Experimental Study of Pre-oxidation Effect on Limit Parameters of Coal Secondary Spontaneous CombustionWANG Kai, HE Yunzhong, SHANG BoTest·Research31-358Water Formation and Inrush Risk of Overburden Strata for Extra-thick Coal Seam MiningZHANG Peisen, YAN Fenqian, SUN Yanan, WU JundaTest·Research36-419Delayed Failure Characteristics of Deep Coal Seam Floor in GoafZHANG FengdaTest·Research42-4710Experimental Study on Overburden Movement and Stress Variation of Coal Seam Mining with Associated Step FaultsSUN Yanan, ZHANG Peisen, YAN Wei, ZHAO Yapeng, YAN Fenqian, WU JundaTest·Research48-54,6011Uniaxial Compressive Strength Test on Artificially Frozen ClayLI Huaixin, LIN Bin, FAN DengzhengTest·Research55-6012Decompression Deformation and Stress Distribution of Underlying Coal Seam in Upper Protective Coal Seam MiningSA Zhanyou, WANG Li, LI Lei, LU Weidong, LU Shouqing, YANG ShuaiTest·Research61-6513Study on Mechanical Properties of Coarse Grained Rock and Soil After Weakening and Its Effect on Slope StabilityFEI Xiaoou, MIAO Haibin, WANG Qinghua, MA Mingkang, ZHAO HeTest·Research66-6914Synergistic Prediction Technology of Coal and Gas Outburst of Far and Near Fields in High-efficiency MinePU YangTechnology·Innovation70-74,8015Control Technology of Support Stability in Thick Seam with Large Dip Angle Split-level RoadwayMAO Jinfeng, WANG Peng, YANG Changde, LI JinboTechnology·Innovation75-8016Detection Technology of Unpowered Dust ConcentrationWU FuxiangTechnology·Innovation81-8517Long-distance Fixed-point Detection and Drainage Technology of Goaf Water Under Complex Geological ConditionsLIU Mingjun, LI Xiaolong, YANG Zhong, ZHANG JiadiTechnology·Innovation86-9118Research and Development of Key Components of Positive Pressure Beam Tube Monitoring SystemZHAO XiaoxiaDesign·Development92-9519Near Uniform Air Distribution Design for Shunt of Nitrogen Making Device of Membrane SeparationPAN LiangDesign·Development96-9920A Kind of Power Integrated Regional Fire-fighting Internet of Things Optical Port SubstationSUN Xiaodong, LIU YonggeDesign·Development100-103 