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SSS 2010-07-06

时间:2010-08-05 06:18来源:互联网 提供网友:konicaqq   字体: [ ]
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    (单词翻译:双击或拖选)

Die-hard advocates of alternate energy might fantasize about cars that could one day run on water. But scientists in India have gone a step further. They’ve mathematically modeled an engine that should allow a motorcycle to run on air—compressed air, that is. Their design is described in the Journal of Renewable and Sustainable Energy.

The hunt is on for alternatives to fossil fuels. Internal combustion1 engines convert the energy in gasoline’s molecular2 bonds into motion. But what if there were another way to make engine parts move?

Scientists in India were thinking of a well-directed wind. And after crunching3 the numbers on pressure and flow, they’ve concluded that a tank of compressed air could generate enough power to run a motorcycle for up to 40 minutes. The air would spin a turbine, which would then get things rolling.

Of course they’d need to design a tank that could store enough air to fuel a long haul. Current cylinders4 would need changing or charging after about 20 miles. Which would still cover a lot of commutes5 and trips to the grocery store.

And you’d still need to get air in the tank in a green way. Maybe a solar-powered, geothermal, wind-driven compressor?

Thanks for the minute for Scientific American’s 60-Second Science. I’m Karen Hopkin


点击收听单词发音收听单词发音  

1 combustion 4qKzS     
n.燃烧;氧化;骚动
参考例句:
  • We might be tempted to think of combustion.我们也许会联想到氧化。
  • The smoke formed by their combustion is negligible.由它燃烧所生成的烟是可忽略的。
2 molecular mE9xh     
adj.分子的;克分子的
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。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
3 crunching crunching     
v.嘎吱嘎吱地咬嚼( crunch的现在分词 );嘎吱作响;(快速大量地)处理信息;数字捣弄
参考例句:
  • The horses were crunching their straw at their manger. 这些马在嘎吱嘎吱地吃槽里的草。 来自《简明英汉词典》
  • The dog was crunching a bone. 狗正嘎吱嘎吱地嚼骨头。 来自《简明英汉词典》
4 cylinders fd0c4aab3548ce77958c1502f0bc9692     
n.圆筒( cylinder的名词复数 );圆柱;汽缸;(尤指用作容器的)圆筒状物
参考例句:
  • They are working on all cylinders to get the job finished. 他们正在竭尽全力争取把这工作干完。 来自《简明英汉词典》
  • That jeep has four cylinders. 那辆吉普车有4个汽缸。 来自《简明英汉词典》
5 commutes 3547de72fa26e075391aeef6adf7f98a     
上下班路程( commute的名词复数 )
参考例句:
  • She commutes from Oxford to London every day. 她每天上下班往返于牛津与伦敦之间。
  • Barbara lives in Oxford and commutes. 芭芭拉住在牛津,通勤往来。
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