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
2016-08-09
74
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/CVPK777K
0
专业英语四级
相关试题推荐
Itwasonlyafewweeksaftermysurgery,andIwenttoDr.Belt’sofficeforacheckup.Itwasjustaftermyfirstchemotherapy
Ihadateacheroncewhocalledhisstudents"idiots"whentheyscrewedup.Hewasourorchestraconductor,afierceUkrainiani
WhichofthefollowingitalicizedpartsexpressesPURPOSE?
InEnglish,thecolorgreenisassociatedwithjealousy,whichissometimesjokinglycalled"thegreen-eyedmonster".Butit’s
Basically,anythingtodowithmusicisrightupmyalley.Theunderlinedpartmeans______.
Certainlynocreatureintheseaisodderthanthecommonseacucumber.Alllivingcreatures,especiallyhumanbeings,havethei
Commoncoldisaviralinfectionthatstartsintheupperrespiratorytract,sometimesspreadstothelowerstructures,andmay
Ifsustainablecompetitiveadvantagedependsonworkforce,skills,Americanfirmshaveaproblem.Human-resourcemanagementis
Afindinginrecentyearsshowsthatmencannotmanufacturebloodasefficientlyaswomencan.Thismakessurgeryriskierforme
A、Itisametaphortoshowyouneedtobehateful.B、Itisametaphortoshowyouneedtobehostile.C、Itisametaphortoshow
随机试题
不符合岗位质量要求的内容是()。
枳实导滞丸的药物组成包含
患者,男,40岁。咳嗽,多痰10年余,痰经放置出现分层现象。查体:有杵状指(趾)。应首先考虑的是
某医师随机抽样调查了500例本地产妇及400例外来人口中的产妇的如下指标:婴儿性别,产妇年龄,年人均收入(元),产前检查次数,是否有妊高征,有无子痫,基础血压(mmHg)等。要分析外来人口中的产妇的年龄与有无子痫的关系,应该首选用什么分析方法
依照《民法通则》规定,不能完全辨认自己行为的精神病人属于()能力人。
变压器等电气设备进行电容比测量时,其主要目的是()。
种植屋面的防水层的材料性能说法不正确的()。
承包商在投标报价阶段进行风险分析时,可采用的简明方法是()。[2008年真题]
下列关于“道德”的表述正确的是()。
ExercisingtoMusicPumpsupBrainPowerIfmusicmakesyousmarter,andexercisehelpsbrainfunction,canexercisingtomus
最新回复
(
0
)