1Research progress on accumulation mechanism and formation geological conditions of coalbed methaneLIU Dameng, LIU Zhengshuai, CAI YidongSpecial Review1-162Dynamic characteristics of low-concentration oxygen-containing gas explosion and prevention and control key technologiesSI Rongjun, LI RunzhiTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program17-363Research on testing technology of deformation and failure of boreholes in coal seam gas drainage and its applicationLI Zhonghui, WANG Enyuan, ZHENG Anqi, NIU Yue, ZHANG Xin, CAI GuannanTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program37-444Experimental study on distribution of negative pressure and flow rate under conditions of deformation and instability of boreholesZHANG Xuebo, WANG Wenyuan, SHEN ShuaishuaiTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program45-515Time-dependent viscosity diffusion model of cement mortar grouting for gas drainage borehole sealingZHANG Hongtu, LI Yang, YAO Banghua, WANG MianTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program52-596Exploration on gas drainage technology and equipment of fracture zone in coal seam roofYAN Baoyong, CAO Liu, ZHANG JiaguiTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program60-667Micropore structure of outburst coal seam in Guizhou Area and its effect on gas flowLI Xijian, XUE Haiteng, CHEN Liuyu, SHEN Zhonghui, XU Mingzhi, XU ShiqingTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program67-748Study on difference and control factors of coal and gas outburst disasters in Huaibei CoalfieldWANG Liang, ZHENG Siwen, ZHAO Wei, CHEN Dapeng, ZHU ZibinTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program75-839Technical system and engineering practice of coal seam permeability improvement through underground directional long borehole hydraulic fracturingCHEN Dongdong, SUN Siqing, ZHANG Jian, ZHAO Jizhan, ZHENG Kaige, JIA BingyiTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program84-8910seepage characteristics and permeability enhancement effect of coal seam under supercritical CO2 conditionWU Di, WANG Hanyang, MIAO Feng, ZHAI Wenbo, LIU XueyingTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program90-9611Development and application of complete set of anti-reflection equipment for ultra-high pressure hydraulic seam cuttingZHANG Yongjiang, LU ZhanjinTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program97-10412Experimental study on coal gas adsorption characteristics under action of low temperature liquid nitrogenQIN Lei, LIN Haifei, LAN Shirui, ZHAO Pengxiang, YAN MinTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program105-11213Study on phase equilibrium of separation and purification for gas with high CO2 concentration based on hydrate methodZHANG Baoyong, YU Yang, WU Qiang, LIU ChuanhaiTopics of Mine Gas Control Technology Research Achievements Supported by National Science and Technology Program113-11814Study on equivalent calculation method of surface subsidence in inclined coal seam miningZHANG HuaxingProceedings of 2020 National Symposium on New Technologies of Mine Surveying119-12315In-site surveying and study on development laws of surface cracks by high-intensity mining in Shangwan MineDAI Huayang, LUO Jingcheng, GUO Junting, YAN Yueguan, ZHANG Wang, ZHU YuanhaoProceedings of 2020 National Symposium on New Technologies of Mine Surveying124-12916Research on characteristics of mining-induced surface cracks based on UAV imagesTANG Fuquan, LI Linkuan, LI Xiaotao, LIU ShiweiProceedings of 2020 National Symposium on New Technologies of Mine Surveying130-13617Stability evaluation of mining-induced goaf site based on dimensionality reduction fuzzy C-means clustering algorithmGUO Song, GUO Guangli, LI Huaizhan, CUI HaishangProceedings of 2020 National Symposium on New Technologies of Mine Surveying137-14218Dynamic prediction of mining-induced subsidence for any surface point based on optimized time functionZHANG Bing, ZHAO Yuling, CUI Ximin, YUAN Debao, LI ChunyiProceedings of 2020 National Symposium on New Technologies of Mine Surveying143-14919Comprehensive study of parameters of probability integral method of mining subsidence in urban planning areas of Jining CityZHANG Feng, WU Zhicong, ZHANG Yan, TAN XiuquanProceedings of 2020 National Symposium on New Technologies of Mine Surveying150-15720In-site monitoring study on relationship between movement and deformation of surface and buildings in mining areaYAN Yueguan, SHI Xiaobo, LIU Jibo, TIAN Xiuguo, ZHANG GuoguangProceedings of 2020 National Symposium on New Technologies of Mine Surveying158-165 