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系统地研究了6种柴油馏分中蜡对其低温流动性的影响.用蒸馏、脱蜡、加蜡等方法对上述柴油馏分处理,制成一系列试样,测出各试样的凝点、冷滤点、蜡含量和蜡的平均碳链长,建立了经验方程.并用临氢降凝生成油及文献报导的分析数据,对经验方程作了验证。 相似文献
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为了分析经典侵彻深度经验公式对带攻角弹体斜侵彻混凝土靶的适用性,介绍了目前应用较广且精度较高的混凝土侵彻深度计算经验公式,并以152 mm一级轻气炮为试验平台,通过弹体攻角、倾角联合侵彻C30素混凝土靶的试验加载测试系统进行试验研究,测得了弹体着靶速度、开坑尺寸和侵彻深度。并应用各经验公式对带攻角弹体斜侵彻混凝土目标的侵彻深度进行了计算和对比,分析了不同经验公式计算值与实测值之间的差异。试验研究表明,对于带攻角弹体斜侵彻混凝土的侵深经验公式中,ACE公式和Forrestal公式计算侵彻深度与实测侵深最为接近,相对误差均未超过10%,满足工程计算需求。 相似文献
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吕中杰 《北京理工大学学报(英文版)》2009,18(3):253-257
Collisions between multibody systems are irreversible processes which cause loss of internal energy by a stress wave that propagates in the impacting bodies away from the region of impact.A coefficient of restitution relating to approach velocity is introduced to denote the losses of translational kinetic energy.A parameter β involved in internal energy losses has been obtained to calculate the coefficient of restitution.As a result,the internal energy losses caused by elastic stress waves and the contact d... 相似文献
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In order to study the mechanism of steam explosion caused by the interactionbetween coolant and melted metal drops with high temperature,the process of explosion generated by water following interaction with molten metal drops is carried out.In the experiment,liquid aluminum and water with different ratios and different temperatures were evaluated,and the influence of different water temperatures on the steam explosion was studied.The corresponding rules of steam explosion at the different experimental conditions were derived.The difference between experiment resultants was analyzed.The experimental results show that when the ratios of liquid aluminum to water are within a certain range,explosions maybe happen,and the higher the temperature of water is,the less likely explosions will occur while other conditions remain the same.The research results would provide an insight into controlling steam explosion. 相似文献
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在阐述容积率相关理论的基础上,从项目管理的角度对容积率在城中村改造项目中的重要性和影响容积率控制的主要因素进行了分析,研究了在现有城中村改造项目中确定容积率的计算方法以及容积率与开发利润、社会效益、环境效益之间的相互关系。从城市可持续发展层面对城中村改造项目的合理容积率进行了重点探讨与研究,把空间形态、环境效益与经济效益三个因素与确定合理容积率的方法统一起来,以期实现城市土地的合理利用和城中村改造效益的最大化。 相似文献
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研究了大庆柴油(250~440℃)中蜡对其低温流动性的影响.结果表明,投点(或冷滤点)与错的组成和含量有关.提出的经验公式能准确地表达投点(或冷滤点)与代油中蜡含量和正构烷烃平均键长之间的定量关系.计算值与实测值吻合. 相似文献
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注浆技术是指通过采用压送的方式在松散的土层或含水的岩层裂缝中压入一定凝胶时间的浆液,使浆液在凝结之后能够使颗粒或岩层的裂缝达到稳固状态。本文从房屋建筑工程施工中注浆技术的应用优势入手,详细论述了注浆方法及注意要点等事项。 相似文献
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