单词:energy surface density
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A supermassive black hole is quite simply gravity gone mad. An object of such concentrated matter its gravitational pull is insatiable. Nothing can escape it, not even light itself. Anything that gets
微波炉发明源于一项最高军事机密 Many people around the world use a microwave oven every day, not knowing that a crucial part of it was once a top military secret. 世界上许多人每天都在使用微波炉,但却不了解它曾经是一
This is Scientific American's 60-Second Science, I am Steve Mirsky, got a minute? You are pulling the tape off the roll and it starts to tear, or you are moving wallpaper and it refuses to strip off in strips or in what may be the most infuriating ca
(Woman) Today I want to talk about the Earth's last major climatic shift, at the end of the last ice age. But first, let's back up a moment and review what we know about climatic change in general. First, we defined climate as consistent patterns of
Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At t
American inventor John Goodenough first started working on battery technology more than 40 years ago. Goodenough actually co-invented lithium-ion batteries in 1980. This eventually led to a revolution in the electronics industry because those devices
-Im Chris Kaufman and I here with Justin Kasper, who works at Smithsonian, hes an astrophysicist at the Smithsonian. And he's won a project thats gonna launch a probe at the sun, specifically the Solar Wind Electrons Alphas and Protons investigation,
Turning Cigarette Butts to Batteries 烟头转变成电池 If you see a person carelessly throw a cigarette to the ground, what are you likely to think? That depends. If you hate people throwing things on the ground, you might think, That person shou
Scientists and politicians have gathered in the Indonesian city of Manado for the World Ocean Conference. They are discussing the role of oceans in mitigating climate change and how climate change affects the world's seas, but their efforts are hamp
Chicagos Argonne Lab Developing Battery of the Future CHICAGO In 2012, the Department of Energys Office of Science awarded a $120 million grant to a new technology center focused on battery development - headquartered at Argonne National Laboratory i
How Military Research Finds Its Way to Everyday Life 军事研究是如何走进日常生活的? WASHINGTON Sometimes simple scientific advances in one field can have value far beyond their intended use. Many of these advances can change the world an
By Brian Padden Paris 21 June 2007 The airline industry has long sought to develop new technology to offset the rising cost of fuel, but the industry also has looked to make flying more energy efficient. This year at the Paris Air Show many companies
Scientists from the University of Central Florida (UCF) have created a supercapacitor battery prototype that works like new even after being recharged 30,000 times. 来自中佛罗里达大学(UCF)的科学家已经创造了一个超级电容电池
2006职称英语考试模全真拟试题理工类B级(二) 第一部分:词汇选择(第1-15题,每题1分,共15分) 下面共有15句子,每个句子均有一个词或短语划有底横
如今,高端大气上档次已经成为众人耳熟能详的网络用语,凭借其无与伦比的受欢迎度,高端大气上档次一度位居十大网络用语的榜首。这句让无数互联网迷们捶足顿胸的潮流时尚用语,到底
This dark energy doesn't behave like any other substance we know at all and acts more like antigravity force. 这种暗能量的性质与我们所熟知的其他物质完全不同,它更像是反重力。 We say that it has a gravitational pressure
Looking up at the night sky, we are amazed by how it seems to go on forever. 仰望夜空,我们为它的永无止境而感到惊讶。 But what will the sky look like billions of years from now? 然而数十亿年前的天空又会是什么样子呢
After failing in Beijing's license plate lottery system for some three years, Qin Xiaofei finally made his decision in January to buy a battery-driven car to chauffeur his wife who has recently become pregnant. But, he says, one of the biggest concer
16.The early railroads were........the existing arteries of transportation: roads,turnpikes, canals,and other waterways. A.those short lines connected B.short lines that connected C.connected by short lines D.short connecting lines 答对率:50% 答案