化学家制造出可反复擦写的纸张-凯发k8官网

化学家制造出可反复擦写的纸张
文章来源:未知 文章作者:enread 发布时间:2014-12-03 07:07 字体: [ ] 
(单词翻译:双击或拖选)
first developed in china in about the year a.d. 150, paper has many uses, the most common being for writing and printing upon. indeed, the development and spread of civilization owes much to paper's use as writing material. according to some surveys, 90 percent of all information in businesses today is retained on paper, even though the bulk of this printed paper is discarded after just one-time use.
 
such waste of paper (and ink cartridges) -- not to mention the accompanying environmental problems such as deforestation and chemical pollution to air, water and land -- could be 1 if the paper were "rewritable," that is, capable of being written on and 2 multiple times.
 
chemists at the university of california, riverside have now fabricated in the lab just such novel rewritable paper, one that is based on the color switching property of commercial chemicals called redox dyes. the dye forms the imaging layer of the paper. printing is achieved by using ultraviolet light to photobleach the dye, except the portions that constitute the text on the paper. the new rewritable paper can be erased and written on more than 20 times with no significant loss in contrast or resolution.
 
"this rewritable paper does not require additional inks for printing, making it both economically and environmentally viable," said yadong yin, a professor of chemistry, whose lab led the research. "it represents an attractive alternative to regular paper in meeting the increasing global needs for sustainability and environmental conservation."
 
study results appear online today (dec. 2) in nature communications.


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1 7746e1f810c323c484795ba1ce76a5e5     
v.截断,缩短( curtail的过去式和过去分词 )
参考例句:
  • spending on books has been severely curtailed. 购书开支已被大大削减。
  • their public health programme had to be severely curtailed. 他们的公共卫生计划不得不大大收缩。 来自《简明英汉词典》
2 f4adee3fff79c6ddad5b2e45f730006a     
v.擦掉( erase的过去式和过去分词 );抹去;清除
参考例句:
  • he erased the wrong answer and wrote in the right one. 他擦去了错误答案,写上了正确答案。 来自《简明英汉词典》
  • he removed the dogmatism from politics; he erased the party line. 他根除了政治中的教条主义,消除了政党界限。 来自《简明英汉词典》
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