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透明隔热涂料因其环保、节能和良好的视觉效果而日益受到研究者和相关产业界重视。为了发挥透明隔热涂料的透明和隔热功能,通常在隔热涂料制备过程中添加隔热填料,尤其是掺杂型的纳米填料。本文对透明隔热涂料用纳米金属氧化物填料的结构、制备、尺寸、形貌、光学性能和应用进行了系统阐述,同时探讨了纳米金属氧化物对透明隔热涂料性能的影响因素。不同的纳米金属氧化物对于各个波段的可见光透过和近红外屏蔽的程度各不相同。降低原料成本、环境友好并简便的合成方法和工业化生产,仍是透明隔热涂料发展亟需解决的问题。 相似文献
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纳米透明隔热涂料因其具有良好的隔热作用和高的可见光透过率,能起到很好的节能效果,具有极高的应用价值和广阔的市场前景,因而越来越受到人们的关注。本文综述了纳米透明隔热涂料的研究进展和发展现状,同时,对功能隔热材料的隔热原理作了较详细的介绍。 相似文献
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纳米透明隔热涂料对不同频谱阳光的透过具有选择性,本文介绍该涂料及其在建筑玻璃上的开发应用。它不但经济适用,而且节能环保,因而为建筑节能提供了一条新思路。 相似文献
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在艺术大师及其流派层出不穷、交相辉映的20世纪初,回顾莫迪里阿尼那一段历史,有着不容忽略的意义.他是一个真正的独行者,游离于所有时髦的艺术流派之外,他独特的人像创作与他对美学独到的理念遥相呼应,确立并巩固了他在现代艺术史上的地位.本文介绍了他不同时期的经历对他的艺术作品的影响,以及他短暂却又卓越的艺术生涯. 相似文献
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从今年4月1日起,国家对斜交轮胎生产企业的消费税征缴从原来的10%调整下降到3%.缴征税的调整,意味着轮胎企业缴税的负担轻了.从某种意义上来讲,有利于经营效益的提高、再生产资金的增加和积累、提高和改善职工的福利,会有更多的资金投入产品的研发和设备的更新改造,这是一个利好消息.但是,笔者认为,这是机遇和挑战并存的非常时期! 相似文献
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The strength of the randomized trial to yield conclusions not dependent on assumptions applies only in an ideal setting. In the real world various complications such as loss-to-follow-up, missing outcomes, noncompliance and nonrandom selection into a trial force a reliance on assumptions. To handle real world complications, it is desirable to make as few and as reasonable assumptions as possible. This article reviews four techniques for using a few reasonable assumptions to design or analyse randomized trials in the presence of specific real world complications: 1) a double sampling design for survival data to avoid strong assumptions about informative censoring, 2) sensitivity analysis for partially missing binary outcomes that uses the randomization to reduce the number of parameters specified by the investigator, 3) an estimate of the effect of treatment received in the presence of all-or-none compliance that requires reasonable assumptions, and 4) statistics for binary outcomes that avoid some assumptions for generalizing results to a target population. 相似文献
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对目前国内外连续重整技术的发展趋势以及技术进步所面临的问题进行了综述,并介绍了连续重整工艺技术和催化剂的最新进展。 相似文献
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揭示了连续重整的反应温度、压力、空速、氢油比、催化剂循环速率的相互关系,以及催化剂、原料和产品辛烷值对这些参数的影响。通过对比现有连续重整装置的设计参数及实际运行状况,充分考虑连续重整工艺和催化剂的技术进步,对新建连续重整装置的设计参数进行了探讨。 相似文献
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N. Dudai A. Poljakoff-Mayber A. M. Mayer E. Putievsky H. R. Lerner 《Journal of chemical ecology》1999,25(5):1079-1089
Essential oils were extracted from 32 aromatic plants and evaluated for allelopathic properties. The major components of the oils were identified by gas chromatography and GC-MS. Extracts from Origanum syriacum, Micromeria fruticosa, and Cymbopogon citratus were selected for further study. The germination of several species, including wheat, was strongly inhibited by essential oils when applied at 20–80 ppm. Essential oils mixed with the top 0.5 cm of soil inhibited germination of wheat and Amaranthus seeds. This effect depended on the type of soil. The possible use of essential oils as herbicides is discussed. 相似文献