排序方式: 共有9条查询结果,搜索用时 31 毫秒
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张军霞 《资源节约和综合利用》2012,(9):63-63
今年28岁的亚当,是一位来自英国的小伙子。他一直向往安静而自由的生活,大学毕业后,曾经尝试过很多不同的工作,每次总是感觉不尽如人意。 相似文献
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《资源节约和综合利用》2010,(12):33-33
11月8日,科学家们开始利用位于瑞士和法国边境的欧洲大型强子对撞机制造小型"宇宙大爆炸",模拟近140亿年前宇宙形成的瞬间过程。 相似文献
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王奉安 《辽宁城乡环境科技》2010,(2):22-23
令人产生矛盾心理的是:参加哥本哈根会议研究抑制地球变暖的一些国家的专家和官员前脚没有迈出,后脚就因为寒冷而滞留机场无法正常回家。 相似文献
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Environmentally benign carbon dioxide offers significant potential in its supercritical fluid phase to replace current reliance on a range of hazardous,relatively expensive and environmentally damaging organic solvents that are used on an extensive global basis.The unique combination of the physical properties of supercritical fluids are being exploited and further researched to continue the development and establishment of high efficiency,compact plant to provide energy and water efficient manufacturing processes.This mini-review is focused on the use and potential applications of supercritical fluid carbon dioxide for a selected range of key and emerging industrial processes as a sustainable alternative to totally eliminate or greatly reduce the requirement of numerous conventional organic solvents.Examples of the industries include:chemical extraction and purification,synthetic chemical reactions including polymerization and inorganic catalytic processes.Biochemical reactions involving enzymes,particle size engineering,textile dyeing and advanced material manufacture provide further illustrations of vital industrial activities where supercritical fluid technology processes are being implemented or developed.Some aspects relating to the economics of sustainable supercritical fluid carbon dioxide processes are also considered. 相似文献
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陈全 《中国安全生产科学技术》2017,13(6):157-161
为了优化迷你仓消防设计,确定最优机械排烟量及储柜布置方案,在充分实地调研基础上,总结迷你仓的特点及消防隐患,并运用火灾动力学软件FDS对迷你仓不同的火灾工况进行数值模拟,对能见度、烟气层高度以及温度等参数进行分析,不同机械排烟方案及储柜间距的计算结果显示:迷你仓内部蓄烟能力差,烟气沉降速度较快;常规排烟量烟气控制效果差,排烟量为120 m3/(h·m2)的排烟方案的烟气控制效果明显;当2排储柜之间的距离大于1.5 m时,可有效降低火灾的快速蔓延。 相似文献
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