排序方式: 共有6条查询结果,搜索用时 15 毫秒
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近年来,大学生安全事件频发,引起社会普遍关注。当前,大学生安全教育面临国际形势复杂变化及国内社会转型的双重挑战,加强新形势下大学生安全教育刻不容缓。安全教育要取得实效,就必须对大学生常见的安全事故进行梳理,探究事件背后发生发展的内在规律,找准工作的着力点和切入点,并从社会、学校、家庭及大学生自身寻找事故发生的原因,进而提出大学生安全素质培育的路径。 相似文献
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本文综述了改善HCCI低负荷着火添加剂的研究进展,着重介绍了添加剂的选择依据及添加剂改善着火的作用机理.本文指出二烷基过氧化物类燃油添加剂具有良好的应用前景和下一步需要解决的问题. 相似文献
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介绍HCCI的基本概念及燃烧的特点,并对目前国内外的研究进展进行分析,指出HCCI方式所面临的主要困难和有待解决的问题,展望HCCI的应用前景. 相似文献
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The experimental investigation of homogeneous charge compression ignition (HCCI) process is carried out on a 4-cylinder diesel engine. One of the cylinders is modified for HCCI combustion with mixed additives. The influence of mixed additives on the HCCI combustion process is investigated. The experimental results indicate that the mixed additives are better than the single additives for HCCI fuel, causing ignition and heat release to be advanced and the peak of heat release rate to increase under the condition of different engine speeds and steady HCCI combustion. Moreover, with the increase in engine speed, the influence of mixed additives on HCCI combustion is more obvious. In addition, the mixed additives are beneficial to improve HCCI engine misfire at a high engine speed and make the engine operate stable. 相似文献
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