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SSS 2008-11-18

时间:2010-05-15 06:35来源:互联网 提供网友:木渐浅。   字体: [ ]
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

 

In theory, scientists could learn a lot about our health by testing tiny amounts of bodily fluids—a drop of blood, a tear, a bead1 of sweat. But something this small is easily contaminated by other liquids or surfaces. So what are scientists doing? They're making liquids bounce, dance, and float lightly through the air. Researchers from Belgium's University of Liege published their findings November 18th in the New Journal of Physics.

Usually droplets2 on a surface of oil eventually just collapse3. Something called acoustic4 levitation5 was introduced a few years ago, but it takes a lot of complex equipment. Then one researcher noticed something strange. Certain bass6 notes booming from his iPod could make droplets dance and roll around. He and his colleagues pursued this line of inquiry7.

They figured out the appropriate vibrations8 that make the droplets lightly bounce. This keeps them separate from the oily layer underneath9. The result looks as if the drops are rolling around. And the drops haven't had a chance to mix with the fluid below. Researchers say the technique could be used to manipulate tiny amounts of fluid without contamination. Yet another reason why iPods are essential pieces of lab equipment.

 

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 bead hdbyl     
n.念珠;(pl.)珠子项链;水珠
参考例句:
  • She accidentally swallowed a glass bead.她不小心吞下了一颗玻璃珠。
  • She has a beautiful glass bead and a bracelet in the box.盒子里有一颗美丽的玻璃珠和手镯。
2 droplets 3c55b5988da2d40be7a87f6b810732d2     
n.小滴( droplet的名词复数 )
参考例句:
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
3 collapse aWvyE     
vi.累倒;昏倒;倒塌;塌陷
参考例句:
  • The country's economy is on the verge of collapse.国家的经济已到了崩溃的边缘。
  • The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做了一次彻底的调查分析。
4 acoustic KJ7y8     
adj.听觉的,声音的;(乐器)原声的
参考例句:
  • The hall has a fine acoustic.这个大厅的传音效果很好。
  • Animals use a whole rang of acoustic, visual,and chemical signals in their systems of communication.动物利用各种各样的听觉、视觉和化学信号来进行交流。
5 levitation levitation     
n.升空,漂浮;浮起
参考例句:
  • We are particularly interested in phenomena such as telepathy and levitation. 我们对心灵感应及空中漂浮这样的现象特别有兴趣。 来自辞典例句
  • This paper presents a magnetic levitation system control using the gain-scheduling controller. 本文以增益程序控制器针对磁浮系统进行控制。 来自互联网
6 bass APUyY     
n.男低音(歌手);低音乐器;低音大提琴
参考例句:
  • He answered my question in a surprisingly deep bass.他用一种低得出奇的声音回答我的问题。
  • The bass was to give a concert in the park.那位男低音歌唱家将在公园中举行音乐会。
7 inquiry nbgzF     
n.打听,询问,调查,查问
参考例句:
  • Many parents have been pressing for an inquiry into the problem.许多家长迫切要求调查这个问题。
  • The field of inquiry has narrowed down to five persons.调查的范围已经缩小到只剩5个人了。
8 vibrations d94a4ca3e6fa6302ae79121ffdf03b40     
n.摆动( vibration的名词复数 );震动;感受;(偏离平衡位置的)一次性往复振动
参考例句:
  • We could feel the vibrations from the trucks passing outside. 我们可以感到外面卡车经过时的颤动。
  • I am drawn to that girl; I get good vibrations from her. 我被那女孩吸引住了,她使我产生良好的感觉。 来自《简明英汉词典》
9 underneath VKRz2     
adj.在...下面,在...底下;adv.在下面
参考例句:
  • Working underneath the car is always a messy job.在汽车底下工作是件脏活。
  • She wore a coat with a dress underneath.她穿着一件大衣,里面套着一条连衣裙。
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