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郭丽 《读与写:教育教学刊》2009,(4)
相信大家对臭氧这个名词一点也不生疏,臭氧与氧气虽然由相同元素组成,但性质却不一样。氧气供给呼吸,支持燃烧,且无色无味。臭氧虽有些腥臭味,但它同样对人类发挥着巨大的作用。 相似文献
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课题背景
生活中,人们很少会关注头发防晒的问题,而实际上,长期紫外线照射对头发有很大的损害,紫外线会破坏头发中的蛋白质链状结合,从而令毛鳞片翘起、剥落。头发角蛋白中的水分流失后,天然油脂就会减少, 相似文献
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本文比较了紫外线照射、臭氧消毒及空气洁净器消毒的效果,发现臭氧和空气洁净消毒比紫外线照射的效果更好。另外,在消毒后一段时间内,臭氧和空气洁净消毒的供应室增加的细菌菌落明显比经紫外线照射消毒的供应室更少更慢。 相似文献
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We report that the ultraviolet (UV) light induced photochromic behavior of layered organic-inorganic perovskite material of (C4H9NH3)2CuCl4, changed from yellow to brown after irradiation with UV light (10 mW/cm^2) and partially recovered through storage in the dark. (C4H9NH3)2CuCl4 exhibited two distinct absorption bands centered at 286 nm (band Ⅰ) and 384 nm (band Ⅱ), which were attributed to the photo-induced exciton formed in 2D inorganic layers sandwiched by organic layers. The blue shift of band Ⅰ from 287 to 269 nm as well as the decrease of the intensity of band Ⅰ and band Ⅱ could be found when samples were irradiated under UV light for different length of time. The simultaneous weakening of the intensity of the N-H...Cl hydrogen bond as well as the vibration of the long Cu-Cl bond in the distorted CuCl6^4- octahedron could be detected from the Fourier transform infrared (FTIR) spectra, which resulted the change of charge distribution of the dissymmetric Cl-Cu...Cl bond and the resulting photochromic behavior. 相似文献