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SSS 2008-08-08

时间:2010-05-14 06:14来源:互联网 提供网友:木渐浅。   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?

 Ever been woken up by the sound of the refrigerator compressor kicking on? Well, such clumsy heat exchange units featuring long metal coils may be on their way out. Because Penn State scientists are investigating the possibility of solid-state refrigerators that take advantage of electric fields to exchange heat.The researchers work with what are called ferroelectric polymers. When you apply an electric field to these substances, their internal structure goes from random1 to highly organized. And that makes the material colder. Turn off the electricity and the stuff sucks heat back in. In the August 8th issue of the journal Science, the researchers report an electrically induced temperature change of over 22 degrees Fahrenheit2. Throw a heat exchanger into the mix and repeatedly zapping the polymers with electricity could make it possible to heat or cool a space over a wide range of temperatures. Before you get a solid-state fridge, though, look for electronics applications. The polymers could cool circuit boards, making it possible to jam more electronics closer together, leading to smaller devices.

Thanks for the minute, for the Scientific American’s 60-Seconds Science. I’m Steve Mirsky.


点击收听单词发音收听单词发音  

1 random HT9xd     
adj.随机的;任意的;n.偶然的(或随便的)行动
参考例句:
  • The list is arranged in a random order.名单排列不分先后。
  • On random inspection the meat was found to be bad.经抽查,发现肉变质了。
2 Fahrenheit hlhx9     
n./adj.华氏温度;华氏温度计(的)
参考例句:
  • He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。
  • The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。
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