科學60秒:夜間充電益處大
來源：滬江聽寫酷
2011-08-10 10:00
Some things are best done after dark. Setting off fireworks. Telling scary stories. And charging your plug-in hybrid electric vehicle. Because a new study shows that ___1___ your car battery at night generates less ozone. The work appears in the journal Environmental Research Letters. [Tammy Thompson et al., "Air quality impacts of plug-in hybrid electric vehicles in Texas: evaluating three battery charging scenarios"]
Plug-in electric hybrids give off ___2___ than gas guzzlers. And when they’re running on battery power, they generate no fumes at all. But there’s a catch. The power plants that make the electricity you use to recharge the battery produce plumes of pollution. But how much ozone gets produced depends on ___3___.
Electric power plants that burn fossil fuels release hydrocarbons and nitrogen oxides. And when sunlight hits those compounds, ozone forms. At night, however, well, it’s dark. And the compounds ___4___ in large part before the sun comes up.
Scientists modeled how much ozone would be generated if the cars were charged at three different times: overnight, just before they’re driven or just after. And they found that drawing electricity from the grid ___5___ is best. So to drive green, plug in, lay down and get some ozone-free Zs.
【視聽版科學小組榮譽出品】
Plug-in electric hybrids give off ___2___ than gas guzzlers. And when they’re running on battery power, they generate no fumes at all. But there’s a catch. The power plants that make the electricity you use to recharge the battery produce plumes of pollution. But how much ozone gets produced depends on ___3___.
Electric power plants that burn fossil fuels release hydrocarbons and nitrogen oxides. And when sunlight hits those compounds, ozone forms. At night, however, well, it’s dark. And the compounds ___4___ in large part before the sun comes up.
Scientists modeled how much ozone would be generated if the cars were charged at three different times: overnight, just before they’re driven or just after. And they found that drawing electricity from the grid ___5___ is best. So to drive green, plug in, lay down and get some ozone-free Zs.
【視聽版科學小組榮譽出品】
topping off
less exhaust
when you reach for that plug
disperse
after-hours
有些事情在暗夜才有效果，比如說放焰火、講鬼故事。還有，為你的插電式混合動力電動汽車充電。一項新的研究表明夜間為汽車充電產(chǎn)生的臭氧較少。該研究成果刊登在《環(huán)境研究快報》上。
插電式混合動力電動車排放的廢氣要比油耗大的車少，而且在使用電池能時不會產(chǎn)生任何濃煙。不足之處在于，為你的充電電池提供電能的發(fā)電廠產(chǎn)生的污染相當嚴重。不過，產(chǎn)生多少臭氧則取決于你在何時充電。
通過燃燒化石燃料提供電能的發(fā)電站會釋放大量碳氫化合物以及氮氧化物，經(jīng)陽光照射，就形成了臭氧。不過在夜間，因為沒有陽光，大部分的化合物在太陽出來之前就消散了。
科學家們分別在夜間、用車前以及用車后這三個時間段為汽車充電，以估算在這三個時間段內產(chǎn)生的臭氧量。他們發(fā)現(xiàn)在夜間充電效果最好。為了綠色出行，插上電源，然后躺下來睡個好覺吧～無臭氧的哦～～
