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SSS 2011-10-05

时间:2011-11-01 07:42来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

 
The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the Technion–Israel Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals. Sven Lidin of the Royal Swedish Academy of Sciences on the atoms and clusters within a quasicrystal: "It is perfectly1 ordered, it is infinite—and yet it never repeats itself."
 
Such patterns can be seen in Islamic mosaics2 and the tilings of mathematical physicist3 Roger Penrose. "Daniel Schechtman's discovery was to show that they existed also in chemical systems...the most important thing about the quasicrystals are their meaning for fundamental science. They have rewritten the first chapter in the textbooks of ordered matter.
 
"But we also find them in useful objects...they have been used in experiments to strengthen turbine blades...these applications come out of the specific properties of quasicrystals, that they are poor conductors of heat...they have low friction4 and they have low adhesion properties."
 
Thanks for the minute. For Scientific American's 60-Second Science, I'm Steve Mirsky.

点击收听单词发音收听单词发音  

1 perfectly 8Mzxb     
adv.完美地,无可非议地,彻底地
参考例句:
  • The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
  • Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。
2 mosaics 2c3cb76ec7fcafd7e808cb959fa24d5e     
n.马赛克( mosaic的名词复数 );镶嵌;镶嵌工艺;镶嵌图案
参考例句:
  • The panel shows marked similarities with mosaics found elsewhere. 这块嵌板和在其他地方找到的镶嵌图案有明显的相似之处。 来自《简明英汉词典》
  • The unsullied and shining floor was paved with white mosaics. 干净明亮的地上镶嵌着白色图案。 来自辞典例句
3 physicist oNqx4     
n.物理学家,研究物理学的人
参考例句:
  • He is a physicist of the first rank.他是一流的物理学家。
  • The successful physicist never puts on airs.这位卓有成就的物理学家从不摆架子。
4 friction JQMzr     
n.摩擦,摩擦力
参考例句:
  • When Joan returned to work,the friction between them increased.琼回来工作后,他们之间的摩擦加剧了。
  • Friction acts on moving bodies and brings them to a stop.摩擦力作用于运动着的物体,并使其停止。
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