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
62
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.
We can infer from the passage that______.
选项
A、when put into water, nanoparticles are highly active and hot enough to vaporize it
B、the steam bubble with some nanoparticles in it would float to the surface with steam released
C、once the nanoparticles are used up, new ones should be put into the water again
D、efficient use of steam may reduce the energy cost in some industrial processes
答案
D
解析
推断题。根据最后一段,使用纳米粒子降低了产生蒸汽的成本,操作起来高效便捷,这在诸如发电、产生热量、降低脱盐等过程的能源密集型性质上具有重要意义,[D]“蒸汽的高效利用可能会降低某些工业过程中的能源消耗。”表述正确,故为答案。
转载请注明原文地址:https://kaotiyun.com/show/3VPK777K
0
专业英语四级
相关试题推荐
Fiftyyearsago,mostpeople’sdailylevelsofactivitywereequivalenttowalkingthreetofivemilesaday.Today,the【C1】____
Ihadateacheroncewhocalledhisstudents"idiots"whentheyscrewedup.Hewasourorchestraconductor,afierceUkrainiani
InEnglish,thecolorgreenisassociatedwithjealousy,whichissometimesjokinglycalled"thegreen-eyedmonster".Butit’s
Basically,anythingtodowithmusicisrightupmyalley.Theunderlinedpartmeans______.
______theSouthKoreanconglomerates,fewotherfirmshavetheresearchanddevelopmentresourcestocompeteintheseareas.
Iwasasecond-yearmedicalstudentattheuniversity,andwasonmyseconddayofroundsatanearbyhospital.Myuniversity’s
Auctionsarepublicsalesofgoods,conductedbyanofficiallyapprovedauctioneer.Heaskedthecrowdtogatherintheauction
Itisnogood______him.Heisalwaysindifferenttowardsothers’matters.
Thisisthesmallhouselessthan15squaremetres,under______rooflivesalargefamilyofthreegenerations.
A、Youwillbetrainedbutunpaid.B、Youwillbepaidbutbemadetoworkharder.C、Youwillbetrainedifyoupaymoney.D、Youw
随机试题
被告应当在收到起诉状副本之日起15日内,提供据以作出具体行政行为的全部证据和所依据的规范性文件。()
卵巢良性肿瘤手术治疗原则,错误的是()
一位临终患者向护士叙述:“我得病不怪别人,拜托你们尽力治疗,有什么新疗法,可以在我身上先试验。奇迹总是有的呀。”该患者处在心理反应的
工程项目费用管理的核心部分是()。
卫星通信系统由()组成。
下列选项中,语义表述明确的一项是()。
某工厂产品的合格率为95%,抽查其中100件产品,没有发现不合格的。下列正确的说法是()。
某部门原计划召开为期10天的重要会议,预算费用为32000元,由于议程安排紧凑,会期比计划缩短了两天,实花费用节省了25%。其中,仅住宿一项就占会议节省费用的60%,问会议住宿费节省了多少元?()
产业结构政策:指一定时期内政府为促进本国产业结构的调整、优化和升级所制定的政策。根据以上定义,下面属于产业结构政策的是()
PASSAGETHREEWhatdoesthesentence"thegovernmenthascut...trainingcourses"inthelastparagraphimply?
最新回复
(
0
)