<正> Analyzed the rule of the Water Flowing Fractured (WFF) zone's development during the fully mechanized top coal caving.Six influence factors of WFF'
摘要:高新技术企业具有高创新性特征,是创造力产业的重要组成力量。截至2011年底,大连市已经认定高新技术企业332家,位居东北各市之首,占辽宁省高新技术企业总数一半左右。本篇文章以大连市高新技术企业为研究对象。围绕高新技术企业的经济情况、人员情况和科技活动情况展开数据分析,并给出建设性意见。 关键词:科技活动;R&D活动;高新技术企业 中图分类号:C29文献标识码: A 联合国教育科学暨文化
<正> In view of the measurement difficulties of indexes recommended by the 50Items Experience of Coal Mine Gas Prevention in the process of the nonoutburst coal
<正> Created a new damage model for explosive for LS-DYNA3D,taking advantageof the Taylor method aimed at the high gassy and low permeability coal seam,and nume
<正> Presented the concept of the natural support strength.The natural support strength,the strike sill,the multifunction retractors (developed by the author) a