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SSS 2008-04-22

时间:2010-05-13 07:04来源:互联网 提供网友:0922013129   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 Cynthia Graber. This will just take a minute.


Ben Franklin started it and it's hotter than ever: research on lightning. For the first time, a team of European scientists have used lasers to create electrical activity in thunderclouds. They published in Optics Express. Man-made lightning strikes help with a variety of research efforts including uncovering the mechanisms1 of  lightning and finding the sensitivity of airplanes and power lines. Current methods of creating lightning are expensive and only work about half the time. Lasers could provide a more reliable and cost-effective method. Working atop a New Mexico mountain, scientists shot pulsed lasers into passing thunderclouds. This technique had been suggested 30 years ago. But lasers then weren't stronger enough to trigger any response. The new generation of lasers create plasma2 filaments3, or ionized channels of molecules4 that act like wires. Researchers tested the electrical activity at the sites where they'd aimed the lasers, and they found that there was in fact an electrical discharge. But the channels didn't last long enough to bring a lightening strike to earth. So the team is now working to build stronger and more targeted laser bursts to create homemade lightning.

 

Thanks for the minute, for Scientific American's 60-Second Science, I'm Cynthia Graber.
 


点击收听单词发音收听单词发音  

1 mechanisms d0db71d70348ef1c49f05f59097917b8     
n.机械( mechanism的名词复数 );机械装置;[生物学] 机制;机械作用
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。 来自《简明英汉词典》
  • He explained how the two mechanisms worked. 他解释这两台机械装置是如何工作的。 来自《简明英汉词典》
2 plasma z2xzC     
n.血浆,细胞质,乳清
参考例句:
  • Keep some blood plasma back for the serious cases.留一些血浆给重病号。
  • The plasma is the liquid portion of blood that is free of cells .血浆是血液的液体部分,不包含各种细胞。
3 filaments 82be78199276cbe86e0e8b6c084015b6     
n.(电灯泡的)灯丝( filament的名词复数 );丝极;细丝;丝状物
参考例句:
  • Instead, sarcomere shortening occurs when the thin filaments'slide\" by the thick filaments. 此外,肌节的缩短发生于细肌丝沿粗肌丝“滑行”之际。 来自辞典例句
  • Wetting-force data on filaments of any diameter and shape can easily obtained. 各种直径和形状的长丝的润湿力数据是易于测量的。 来自辞典例句
4 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。
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TAG标签:   SSS  thundercloud
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