首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Today in mind-bendingly cool stuff that nanoparticles(纳米粒子)can do: A team of researchers at Rice University in Texas has demonst
Today in mind-bendingly cool stuff that nanoparticles(纳米粒子)can do: A team of researchers at Rice University in Texas has demonst
admin
2015-04-29
97
问题
Today in mind-bendingly cool stuff that nanoparticles(纳米粒子)can do: A team of researchers at Rice University in Texas has demonstrated a mechanism by which they can create steam in just seconds by focusing sunlight on a mixture of water and nanoparticles. This isn’t just some artificial means of lowering boiling point either: this solar powered "boiler" can produce steam before the water even gets warm to the touch, without ever bringing the aggregate water to a boil.
Right now this research is very much still in the lab, and the researchers aren’t sure exactly how far they can push it. But it doesn’t take much to imagine the possibilities for a steam generator that runs solely on water and sunlight.
The technology works by mixing a small amount of either carbon or gold-coated silicon dioxide(二氧化硅)nanoparticles, each just one-tenth the diameter of a single human hair, with water in a glass vessel. Their small diameters—smaller than the wavelength of visible light—means that they can absorb most of a light wave’s energy rather than scattering it. So when sunlight is focused on the vessel with a lens, the particles quickly become quite hot—hot enough to vaporize(蒸发)the water directly surrounding it.
This creates a bubble of steam that envelopes the nanoparticle, which is now insulated from the cooler liquid water by the steam, which allows it to grow hotter still, vaporizing more of the water immediately around it. At some point the nanoparticle and its steam envelope become large enough to grow buoyant, at which point the whole steam bubble— particle and all—floats to the surface. The steam is released into the air, the particle falls back into the cooler water and sinks back down until it begins to absorb sunlight and heat again, at which point the process starts all over.
Multiply that by the number of nanoparticles in the mixture, and you have something of a simulated boil, but one that doesn’t require the entire pot of water to reach boiling point before the first steam bubbles head to the surface. You can think of it as a way of micromanaging the boiling process, specifically heating some parts of the water(where it touches the nanoparticles)while leaving the rest of the water cool. And the particles themselves are completely durable—they keep absorbing, heating, cooling, and absorbing again, with no need to replace them.
Pretty nuts, no? It spells an interesting future for solar power in general, but more specifically it’s easy to see how a cheap and abundant source of steam, even in low specific volumes, could be used to do anything from generate electricity and heat to lower the energy intensive nature of certain processes like water desalinization(脱盐). As the WaPo points out, the last time someone came up with a cheap and easy way to generate and harness abundant steam it completely changed the world. So there’s that.
The best title for the passage is______.
选项
A、New Technology, Fresh Lifestyle
B、A New Boiling Process with Solar Power
C、Nanoparticles and Steam Creation
D、Importance and Implications of Steam
答案
C
解析
主旨题。根据全文,作者通过相关实验说明了纳米粒子在产生蒸汽方面的新应用:[C]提炼了全部的关键词,最能概括文章主旨,故为答案。
转载请注明原文地址:https://kaotiyun.com/show/AYHK777K
0
专业英语四级
相关试题推荐
Debatesamongcandidatesarerareinmostcountries.ButtheyhavebecomeastapleofAmericanpolitics.Americanslikedebates
Debatesamongcandidatesarerareinmostcountries.ButtheyhavebecomeastapleofAmericanpolitics.Americanslikedebates
John.D.Rockefeller,______,owned90percentofallAmericanoilrefineries.
AfterinvestimatingfiveresidentialgasexplosionsthatkilledfourpeopleintheKansasCity--Topekaareain1988and1989,t
AfterinvestimatingfiveresidentialgasexplosionsthatkilledfourpeopleintheKansasCity--Topekaareain1988and1989,t
Whatdoesthedemonstrationprotestagainst?
______enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermoreinthisfield.
Allofthetechnologicaladvancesthathaveincreasedthequalityofmusichavenotchangedthefundamentalimpactofrecordedm
WashingtonUniversityinSaintLouis,Missouri,isamedium-sizeduniversity.Ithaseleventhousandstudents.Twelvepercentof
随机试题
脊休克产生的原因是()
尿的浓缩过程主要发生在()
Forthispart,youaregiven25minutestowriteacompositiononthetopicTheWaytoSuccess.Youshouldwritenolessthan12
伴有粒层增厚且透明角质颗粒异常明显的是
决定血浆PH(值)最重要的缓冲对是
热平衡法是通过热平衡测定湿蒸汽的(),与同温度下的干饱和蒸汽比较,以确定蒸汽的(),从而计算出蒸汽的()。
【背景资料】某机械设备安装工程项目,该工程的分包商在施工过程中,由于操作人员未按操作规程操作机械设备,发生了意外伤亡事故。伤亡事故发生后,项目承包商立即启动了‘‘安全生产事故应急救援预案”,总包和分包单位根据预案的组织分工立即开始了工作。【问题】伤
某公司2004年销售产品10万件,单价100元,单位变动成本为40元,固定成本总额为500万元,公司负债100万元,年利息率12%,并需每年支付优先股股利10万元,所得税率33%。要求:(1)计算2004年边际贡献;(2)计算2004年税息
有关生态系统中信息传递作用的说法,正确的是()
设.已知线性方程组Ax=b存在两个不同的解.求:(1)λ,a;(2)方程组Ax=b的通解.
最新回复
(
0
)