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SSS 2012-04-20

时间:2012-05-09 07:59来源:互联网 提供网友:gmeng   字体: [ ]
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As it ages, white paper turns distinctive1 of yellow, but why? To find out, scientists artificially aged2 modern paper to rebuild the changes on the molecular3 level, the researchers in the Journal physical review of letters, for 48 days, 3 unpleached paper samples aged rapidly on reactors4 that's simulated in different environmental conditions, the researchers then compared the artificially aged samples to the real deal, 3 pieces of paper crafted in 15 century Europe, this technique allowed them to gauge5 the types and the months of changes going on, about 90% of the weight of old paper is cellulose, the sturdy material that makes plants so walls, but over time cellulose fibers6 oxidase, the process modifies parts of burriest molecules7 and turns them into what we call chromophores which absorb light, white paper is white because it reflect all colors of lights, aging paper filled with chromophores reflects wavelength8 that makes it look yellow, the non-destructive technique used in the study couldn't inform research to preserve and even widen in ancient * art and give paper conservation a brighter outlook. 


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1 distinctive Es5xr     
adj.特别的,有特色的,与众不同的
参考例句:
  • She has a very distinctive way of walking.她走路的样子与别人很不相同。
  • This bird has several distinctive features.这个鸟具有几种突出的特征。
2 aged 6zWzdI     
adj.年老的,陈年的
参考例句:
  • He had put on weight and aged a little.他胖了,也老点了。
  • He is aged,but his memory is still good.他已年老,然而记忆力还好。
3 molecular mE9xh     
adj.分子的;克分子的
参考例句:
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
4 reactors 774794d45796c1ac60b7fda5e55a878b     
起反应的人( reactor的名词复数 ); 反应装置; 原子炉; 核反应堆
参考例句:
  • The TMI nuclear facility has two reactors. 三哩岛核设施有两个反应堆。 来自英汉非文学 - 环境法 - 环境法
  • The earliest production reactors necessarily used normal uranium as fuel. 最早为生产用的反应堆,必须使用普通铀作为燃料。
5 gauge 2gMxz     
v.精确计量;估计;n.标准度量;计量器
参考例句:
  • Can you gauge what her reaction is likely to be?你能揣测她的反应可能是什么吗?
  • It's difficult to gauge one's character.要判断一个人的品格是很困难的。
6 fibers 421d63991f1d1fc8826d6e71d5e15f53     
光纤( fiber的名词复数 ); (织物的)质地; 纤维,纤维物质
参考例句:
  • Thesolution of collagen-PVA was wet spined with the sodium sulfate as coagulant and collagen-PVA composite fibers were prepared. 在此基础上,以硫酸钠为凝固剂,对胶原-PVA共混溶液进行湿法纺丝,制备了胶原-PVA复合纤维。
  • Sympathetic fibers are distributed to all regions of the heart. 交感神经纤维分布于心脏的所有部分。
7 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
8 wavelength 8gHwn     
n.波长
参考例句:
  • The authorities were unable to jam this wavelength.当局无法干扰这一波长。
  • Radio One has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。
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