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  1. 281

    Parameter Optimization of Constant Pressure Grouting Technology for Borehole Sealing with Inorganic Noncondensable Material in Tectonic Coalbed of South China by Zhao Pengtao, Wang Haiqiao, Wang Long, Wang Xinlei, Ma Hongyu

    Published 2023-01-01
    “…After the excavations of No.2164 drainage roadway and layer-through borehole, there are obvious stress concentrations both at the shoulder corners of the roadway and at the borehole bottom, and the scope of the loose circle around the roadway is about 6.2 m. The effective seepage radius of the inorganic slurry gradually increases with a rising grouting pressure, and the slurry seepage range in the sandstone section is broader than that in the mudstone section. …”
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    The Effects of Polishing Techniques on Surface Roughness of De-flex Denture Base by Ahmed Hazim Kassoob, Ihab Nafea Yaseen

    Published 2022-09-01
    “…Materials and methods: A total of 40 circle specimens of De-flex thermoplastic resin with dimensions (30 mm X 2 mm) were divided into four groups according to the surface’s polishing treatment. …”
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  12. 292

    Performance Analyses and Improvements for IEEE 802.15.4 CSMA/CA Scheme in Wireless Multihop Sensor Networks Based on HTC Algorithm by Jianping Zhu, Chunfeng Lv, Zhengsu Tao

    Published 2013-11-01
    “…At first, a novel Hidden Terminal Couple (HTC) algorithm is proposed to avoid the impacts of hidden terminals, and a parallel access scheme is proposed to dispense with taking the routing overhead into account. Along with these two strategies, the accurate statistical performance metrics of throughput and delay of unsaturated, unacknowledged IEEE 802.15.4 beacon-enabled networks for 1-hop and 2-hop scenarios are then predicted based on the models which contains n modified semi-Markov chains and one macro-Markov chain, in which nodes are assumed to locate randomly over a circle plane according to Poisson distribution. …”
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    Stability of Close Chambers Surrounding Rock in Deep and Comprehensive Control Technology by Weijian Yu, Fangfang Liu

    Published 2018-01-01
    “…The numerical simulation results show that the surrounding rock deformation of the chamber and roadway reduced with the revised support program, which the expansion of the rock mass loose circle prevented effectively. The site test shows that the convergence rate of surrounding rock with the improved support was less than 0.2 mm/d, and the rock deformation of chamber and roadway suppressed significantly.…”
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