共查询到12条相似文献,搜索用时 78 毫秒
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The number of safety input directly determines the level of safety, and there exists dialectical and unified relations between safety input and accidents. Based on the field investigation and reliable data, this paper deeply studied the dialectical relationship between safety input and accidents, and acquired the conclusions. The security situation of the coal enterprises was related to the security input rate, being effected little by the security input scale, and build the relationship model between safety input and accidents on this basis, that is the accident model. 相似文献
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首先对被研究对象冲击矛及土体作出了若干假设,并在此基础上建立起力学模型,然后找出研究对象所有受力并对它们进行分析、简化,最后从力学的角度对可控冲击矛钻进轨迹进行了分析. 相似文献
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创新进化博弈视角下政府与企业的策略选择 总被引:1,自引:0,他引:1
创新对提高企业的竞争力,促进社会进步和经济发展具有十分重要的意义.由于创新的风险和不确定性,使得创新在很大程度上取决于创新主体--政府和企业的行为.本文以进化博弈的复制动态方法为工具,构建了创新进化博弈模型,分析了在创新过程中,政府与企业的策略互动及其均衡.本文证明:政府的有效激励会促使企业选择创新,而企业的创新热情将促进政府建立和完善创新激励机制.博弈的进化均衡,是政府从制度上确保降低企业创新的外部成本以激励企业进行创新,企业则选择持续创新以追逐创新收益. 相似文献
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在瓦斯压力不变时,随着地应力的增加,煤的透气性系数开始下降很快;当地应力增至6~7MPa时,煤的透气性系数值开始变缓;当地应力增至IOMPa时,煤的透气性系数值几近为零。这说明,地应力对煤的透气性起着决定性的作用。 相似文献
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在瓦斯压力不变时,随着地应力的增加,煤的透气性系数开始下降很快;当地应力增至6~7 MPa时,煤的透气性系数值开始变缓;当地应力增至10MPa时,煤的透气性系数值几近为零.这说明,地应力对煤的透气性起着决定性的作用. 相似文献
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采场顶板控制设计涉及到支架阻力与围岩活动的相互作用关系。大量事实说明,支架工作阻力P与顶底板移近量S(折合成每m采高每m控顶距的移近量)呈双曲线,二者是互相制约的动态变化过程。引用临界阻力概念、确定合理的支护强度、指导工作面控顶设计;分析影响单体支柱工作面支护强度的主要因素,进行支护改革,取得明显效果。…… 相似文献
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重点介绍了DCS与PLC在控制系统应用中的区别与联系,以求在今后的自控设计过程中向用户提供最适合的控制系统。 相似文献
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According to the different engineering mechanical states of top coal caving and normal stoping of gaseous loose thick coal
seams, the dialectical relation between this caving method and dynamic disasters was analyzed by simulating the change of
stress states in the process of top coal initial caving with different mining and caving ratios based on the ANSYS10.0. The
variation of elastic energy and methane expansion energy during first top coal caving was analyzed by first weighting and
periodic weighting and combining with coal stress and deformation distribution of top coal normal stoping as well as positive
and negative examples in top coal caving of outburst coal seam. The research shows that the outburst risk increases along
with the increase of the caving ratio in the initial mining stage. In the period of normal stoping, when the mining and caving
ratio is smaller than 1:3 and hard and massive overlying strata do not exist (periodic weighting is not obvious), it is beneficial
to control ground stress leading type outburst. Thus, it is unreasonable to prohibit top coal caving in dangerous and outburst
prone areas. 相似文献
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介绍了急倾斜煤层条件下,走向长壁综采工作面的搬家安装实践,采用优化运输线路、优化安装工序,在急倾斜走向工作面综采搬家历史上创造了奇迹,达到了国际先进水平. 相似文献