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SSS 2010-05-28

时间:2010-06-11 06:17来源:互联网 提供网友:swalloer   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific America's Sixty-Second-Science. I am Steve Mirsky. Got a minute?

Some interesting electrical activity in the clouds of ash drifting around Europe as a result of that Icelandic volcano. Models predicted that electrical charge should be limited to the top and bottom of any ash plume1, which is often the site of spectacular lightning.

But info obtained by a weather balloon found significant electrical charge within the plume. And that such charge was being generated within the plume—it wasn’t a remnant of the energy of the volcanic2 eruption3 or a result of any local weather events. Interactions among ash particles seem to be constantly renewing the charge.

The finding appears in the journal Environmental Research Letters and is the first peer-reviewed research related to the April volcano eruption.

The study authors note that charging can change the way the particles clump4 and how they interact with rain. The practical reason for understanding the electrical nature of ash plumes5 is that they can interfere6 with aircraft radio communication. And if any charged ash infiltrates7 a plane, it could be an electrostatic hazard, to the plane’s systems and to the plane’s passengers.

Thanks for the minute for Scientific America's Sixty-Second-Science. I am Steve Mirsky.
 


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1 plume H2SzM     
n.羽毛;v.整理羽毛,骚首弄姿,用羽毛装饰
参考例句:
  • Her hat was adorned with a plume.她帽子上饰着羽毛。
  • He does not plume himself on these achievements.他并不因这些成就而自夸。
2 volcanic BLgzQ     
adj.火山的;象火山的;由火山引起的
参考例句:
  • There have been several volcanic eruptions this year.今年火山爆发了好几次。
  • Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。
3 eruption UomxV     
n.火山爆发;(战争等)爆发;(疾病等)发作
参考例句:
  • The temple was destroyed in the violent eruption of 1470 BC.庙宇在公元前1470年猛烈的火山爆发中摧毁了。
  • The eruption of a volcano is spontaneous.火山的爆发是自发的。
4 clump xXfzH     
n.树丛,草丛;vi.用沉重的脚步行走
参考例句:
  • A stream meandered gently through a clump of trees.一条小溪从树丛中蜿蜒穿过。
  • It was as if he had hacked with his thick boots at a clump of bluebells.仿佛他用自己的厚靴子无情地践踏了一丛野风信子。
5 plumes 15625acbfa4517aa1374a6f1f44be446     
羽毛( plume的名词复数 ); 羽毛饰; 羽毛状物; 升上空中的羽状物
参考例句:
  • The dancer wore a headdress of pink ostrich plumes. 那位舞蹈演员戴着粉色鸵鸟毛制作的头饰。
  • The plumes on her bonnet barely moved as she nodded. 她点点头,那帽子的羽毛在一个劲儿颤动。
6 interfere b5lx0     
v.(in)干涉,干预;(with)妨碍,打扰
参考例句:
  • If we interfere, it may do more harm than good.如果我们干预的话,可能弊多利少。
  • When others interfere in the affair,it always makes troubles. 别人一卷入这一事件,棘手的事情就来了。
7 infiltrates d7b3312caf1679edc76ba6fe08c5591e     
n.(使)渗透,(指思想)渗入人的心中( infiltrate的名词复数 )v.(使)渗透,(指思想)渗入人的心中( infiltrate的第三人称单数 )
参考例句:
  • Caves form when water infiltrates limestone. 水渗透石灰石则形成洞穴。 来自辞典例句
  • The tumor encircles the colon and infiltrates into the wall. 肿瘤环绕结肠四周浸润肠壁。 来自互联网
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