1Prediction of Coal Spontaneous Combustion Based on Gray TheoryWANG Jun-feng, WU Yu-guo, WU Jian-mingTest and Research1-32System of Coal Mine Communication Based on DSSSLU zhen, WANG Jin, SU Guo-junTest and Research3-53Preparation of Activated Coke From Brown Coal Lignite and Study on Its Performance removal of SO2 and NOxCHEN Li-jie, CHEN Jian, GAO Jian, ZHANG Yu-hongTest and Research6-84Experimental Study on Corrosion proof of Concrete for Coal Mine RoadLU Li-hua, CHEN Si-li, NING Bao-kuan, HU Da-weiTest and Research9-115Determination of Gas Drainage Technology Project for 2302 Full-mechanized Sublevel Caving Faces in Zhangcun Coal MineWANG Yao-feng, LI Tie-liangTechnology Experiences11-136Measurement of Availability Drainage Radius of Lead-bore in Three-soft and Low Air Permeability Coal SeamZOU Shan-wang, LIU Ji-hong, MENG Fan-xinTechnology Experiences14-157Practice of Gas Drainage Technology in Gaocheng Coal MineTechnology Experiences16-188Application of Frequency Conversation and Speed-adjusting Technology to Coal Mine VentilatorSHANG Kun, WANG Jian-junTechnology Experiences18-209Unseal and Recovery of NO.2 Coal Column Faces in NO.2 Coal Mine of Pingdingshan Coal CompanyLI Yao-min, HONG Yu-shen, XU Yan-weiTechnology Experiences21-2310Analysis on Fire Prevention Technology of Seal and N2 Injection in Coal Face in NO.2 Mine of Yangcao Coal CompanyTechnology Experiences23-2511Spontaneous Combustion Prevention Practice in Full-mechanized Sublevel Caving FacesAN Man-linTechnology Experiences26-2812Design and Achievement of Video Frequency Monitoring and Controlling System in Shenyang Coal CompanyFU Wen-jun, QIAO Feng-longTechnology Experiences29-3113Spontaneous Combustion Prevention and Controlling Technology in Coal Faces Mining againJIN Jiang-tao, TAN Qi-ming, DING Fu-longTechnology Experiences31-3214Application of Comprehensive Monitoring and Controlling System for Road in Coal MineTechnology Experiences33-3515Application of Comprehensive Grouting Technology in Auxiliary Shaft of Xiaokang Coal MineQIN Yong, WANG Shu-youTechnology Experiences35-3716Analysis for One Gas Explosion AccidentGAO RongIssue Discussion38-4017Analysis for Gas Dynamical Force Phenomena in Majiagou Coal MineYE Qing, LIN Bo-quanIssue Discussion40-4318Probing into Reasons of CO Effusion During Process of Digging HolesIssue Discussion44-4519Status of Big Equipment Intelligence Fault Diagnosis Technology and ProspectCHEN Zhi-qiao, WANG Cheng-gang, WANG Zhi-jieIssue Discussion46-4820How to Measure Insulation Resistance of Electric Wire & Cable CorrectlyYUAN Hong-jun, WANG Hong-qingIssue Discussion49-51 