研究和发展用堆

As it ages, white paper turns distinctive of yellow, but why? To find out, scientists artificially aged modern paper to rebuild the changes on the molecular level, the researchers in the Journal physical review of letters, for 48 days, 3 unpleached p

发表于:2018-12-24 / 阅读(37) / 评论(0) 分类 Scientific American(四)月

As it ages white paper turns a distinctive yellow. But why? To find out, scientists artificially aged modern paper to reveal the changes on the molecular level. The research is in the Journal Physical Review Letters. For 48 days, three unbleached pap

发表于:2019-01-08 / 阅读(43) / 评论(0) 分类 Scientific American(四)月

This is Scientific American 60 second Science I am Sophie Bushwick, got a minute? As it ages, white paper turns a distinctive yellow. But why? To find out, scientists artificially aged modern paper to reveal the changes on the molecular level. The re

发表于:2019-01-08 / 阅读(48) / 评论(0) 分类 Scientific American(四)月

I.Current Situation of Nuclear EnergyDevelopment and Nuclear EmergencyPreparedness一、核能发展与核应急基本形势 It was in the mid-1950s that China embarked on itsnuclear industry. Over the past more than sixdecades China has made constan

发表于:2019-01-08 / 阅读(41) / 评论(0) 分类 英语笔译

Tyler Environmental Prize Winners: Pollution's Effects Far-Reaching Nearly half of the worlds people use biomass fuels such as wood or dried dung to cook their food, and many cook indoors. Professor Kirk Smith of the University of California, Berkele

发表于:2019-01-13 / 阅读(46) / 评论(0) 分类 VOA标准英语2012年(五月)

Wang Yifang, from the Institute of High Energy Physics of the Chinese Academy of Sciences, attended the award ceremony of the 2016 Breakthrough Prize in Fundamental Physics at the NASA Ames Research Centre. He is the director of the team behind China

发表于:2019-01-19 / 阅读(49) / 评论(0) 分类 2015CRI中国国际广播电台
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