1Experiment and mechanism study on extinguishing fire by water mist charged with positive or negative electricYU Ming-gao, LIU Xiao-ting, XU Yong-liang, CAO Dong-sheng249-2542Preparation and evaporation characteristics of ammonia-free foamed gelYU Shui-jun, ZHAO Hong255-2593Precise positioning technology of rescue drilling and its applications in mine disasterLIU Shao-tang, GUAN Yun-lan260-2644Research progress of coal rock properties change in the process of CO2 replacement CH4 in deep coal seamXU Chun-guang, WANG Yan-bin, WANG Xiang-hao, GAO Sha-sha265-269,2765Research on support parameters of mining roadway of deep mining with orthogonal numerical simulationWEI Si-jiang, SUN Chuang270-2766Analyses and application of detection technique for old coal mining areaLI Xue-liang, TIAN Ying-bin277-2807Study on degradation of different rank coals by white-rot fungusSU Xian-bo, CHEN Xin, XIA Da-ping, CUI Quan-yong, ZHANG Hai-quan281-2848Microcharaters of mesozoic-cenozoic reservoir in agadem block of NigerFU Ji-lin, KANG Rong, JIANG Zai-xing, ZHOU Chun-lei, LIU Kang-ning285-292,2979An algorithm of searching degenerate quadtree grid cells along a pathHU Bai-lin, ZHAO Xue-sheng293-29710Combined adjustment research on free-station positioning and deformation monitor point based on the indirect observationsHE Rong, CUI Can298-301,31911Theoretical and experimental research on material removal rate under ultrasonic grindingZHAO Bo, CHEN Fan, TONG Jing-lin302-30712Photovoltaic grid control strategy research based on quasi-Z source inverterYANG Hai-zhu, LIU Jie, WU Fei308-31213Wireless ad hoc network overlay networks key indexing mechanism based on petri net theoryZHANG Li, HUANG Cun-han313-31914Design of urban and rural power supply line switch fault warning device based on networkGAO Cai-xia, WANG Fu-zhong, PEI Su-ping320-32615Study and implementation of theory on short-term load forecastingYANG Xiao-zhong, SI Meng327-33116An improved data load balancing algorithm for hadoopLIU Kun, NIU Wen-liang332-33617Experimental study on infiltration of wedge-shaped head in red sandstone with reserve grooveYANG Xiao-lin, QI Ya-jing, DING Wu-xiu, YANG Ren-hua337-34118Analytical approach for transverse impact of Euler beamWU Xiao, LUO You-xin, YANG Li-jun342-34619A simplified method for analysis of interaction between subgrade and superstructureBai Jun-ying, Ma Fu-long347-35020Effect on mechanical property of cement paste containing thermal-activated composite admixtureLIAO Jian-guo, LIU Qiong, WANG Meng-yang, ZHANG Yi-shun351-355 