1Determination of spontaneous dangerous zones in goaf with gob-side entry retaining under gas drainageYU Minggao, LI Longfei, CHU Tingxiang, LIANG Donglin297-3042Research on comprehensive characterization method of different rank coal porosityWEI Jianping, DAI Shaohua, WEN Zhihui, REN Xichao, LI Mangui305-3103A quantitative analysis method of gas emission source based on gas daily report in working faceWANG Zhaofeng, GUO Lincong, SU Weiwei, CAO Chao311-3154Analysis on gas occurrence law and controlling factors of Ⅱ1 coal seam in Jinxin coal mineLIU Mingju, SI Yachao, ZHANG Hongbin316-3205Control factors and change characteristics of thickness of coal seam in Huxiang coalfieldZHANG Xiaodong, WANG Sike, ZHANG Shuo, MIAO Shulei, LI Wenqian321-3266Comparative study on coal-derived gas reservoir between well Gaogu 4 and its adjacent areas——Exploration direction of coal-derived gas in eastern Linqing depressionLIU Hua327-3327Risk assessment model for water inrush from the roof of coal seam based on GRA-AHPLI Bo333-3388Physical modeling of the tectonic characteristics of foreland thrust belt in KuqaFENG Xukui, ZHU Douxing, SHANG Guoxi, GU Yongxing, XU Jianhua, LIU Yonglei339-3439Study on integrated underground geophysical prospecting method for mine collapse columnYANG Zhenwei, LI Xiaobin, ZHAO Qiufang, XU Zhaofeng, LI Meng, TIAN Hui344-34910Study on combined test method of dewatering and tracingPan Guoying, Lin Yun, Wu Yazun350-35511Research on dynamic topological relationship between area and area based Rough setHU Shengwu, XIE Xin356-36512Study method on scanning line information generation based on three-dimensional scattered pointWANG Guo, CUI Ximin, LI Yongqiang366-36913Error calculation method on image point displacement caused by satellite side-view imagingZHAN Ying, SHI Liangshu, WANG Jinqiang, LI Haiwei370-37314Protecting system of mine mobile refuge chamber and its explosion-proof performance analysisJIAO Feng, L(U) Kun, ZHAO Bo, ZHANG Hai, LIU Bao374-37815The on-line monitoring and fault diagnosis of dissolved gas constituent content in transformer oilWANG Fuzhong, SHAO Shumin, DONG Pengfei379-38316Research on closed-loop speed regulation system of dual-variable cycloconverterDU Qingnan, LU Xikun, LI Gaoju, FENG Gaoming, CHEN Xin384-38917A method for detecting current transformer saturation based on double criteriaWANG Yumei, GU Fei, ZHANG Guozhi, LI Pengxiao390-39518A predictor-correcting power flow algorithm based on Newton-Raphson methodDUAN Jundong, XUE Jingjie, LI Weibing396-39919Java Web file upload with multi-task division based on asynchronous file channelCHEN Gang, XIA Huosong400-40520Particle flow code numerical simulation of bearing mechanism for PCC pile under vertical loadCHEN Yadong, CHEN Si, YU Yan, LIU Ye, SHE Yuexin406-410 