MIT researchers have found a way to improve the energy density of a type of battery known as lithium-air (or lithium-oxygen) batteries, producing a device that could potentially pack several times more energy per pound than the lithium-ion batteries that now dominate the market for rechargeable dev ...
据美国EIA报道,2009年和2010年美国本土电价最高的地区是纽约( http://www.eia.gov/todayinenergy/detail.cfm?id=2330 )。我们中国的电价地区差异有这么大吗?请知情者提供资料,谢谢! Wholesale electricity prices in New York City are the highest in the contiguous U.S. Wholesale, on-peak elect ...
MIT的政治学家 David Singer 解释了为什么 希腊 看似 用欧元不行离开欧元也不行。 (http://web.mit.edu/newsoffice/2011/3q-singer-greece-euro-0622.html) The economic and fiscal woes of Greece remain at the center of European politics. In recent months, a variety of economists and comme ...