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
Few human records survive for long, the 16 000-year-old Paleolithic cave paintings at Lascaux, France, being one exception. Now
Few human records survive for long, the 16 000-year-old Paleolithic cave paintings at Lascaux, France, being one exception. Now
admin
2012-07-05
82
问题
Few human records survive for long, the 16 000-year-old Paleolithic cave paintings at Lascaux, France, being one exception. Now researchers led by Alex Zettl of the University of California, have devised a method that will, they reckon, let people store information electronically for a billion years.
Dr. Zettl and his colleagues constructed their memory cell by taking a particle of iron just a few billionths of a meter or nanometers (纳米) across and placing it inside a hollow carbon nanotube. They attached electrodes (电极) to either end of the tube. By applying a current, they were able to shuttle the particle back and forth. This provides a mechanism to create the "1" and "0" required for digital representation: if the particle is at one end it counts as a "1", and at the other end it is a "0".
The next challenge was to read this electronic information. The researchers found that when electrons flowed through the tube, they scattered when they came close to the particle. The particle’s position thus altered the nanotube’s electrical resistance on a local scale. Although they were unable to discover exactly how this happens, they were able to use the effect to read the stored information.
What makes the technique so durable is that the particle’s repeated movement does not damage the walls of the tube. That is not only because the lining of the tube is so hard; it is also because friction is almost negligible when working at such small scales.
Theoretical studies suggest that the system should retain information for a long time. To switch spontaneously from a "1" to a "0" would entail (使必要) the particle moving some 200 nanometers along the tube using thermal energy. At room temperature, the odds (几率) of that happening are once in a billion years. In tests, the stored digital information was found to be remarkably stable. Yet the distance between the ends of the tube remains small enough to allow for speedy reading and writing of the memory cell when it is in use. The next challenge will be to create an electronic memory that has millions of cells instead of just one. But if Dr. Zettl succeeds in commercializing this technology, digital decay itself could become a thing of the past.
What is Alex Zettl’s research aiming at?
选项
A、Revealing the secret of preserving aged records.
B、Letting people memorize information permanently.
C、Making an electronic memory to retain records for long.
D、Putting his mechanism into the market.
答案
C
解析
推理判断题。定位句表明,Alex Zettl等人的研究会让人们长久地储存信息。由此可以推测,Alex Zettl等人研究的目的是C)“制造能够长久储存信息的电子存储器”。
转载请注明原文地址:https://kaotiyun.com/show/PE57777K
0
大学英语四级
相关试题推荐
Mysuccess____________(从很大程度上来说)shouldbeattributedtomycoworkers.
A、Tomsurvivedtheaccident.B、Tomwaskilledintheaccident.C、SomeonesavedTom’slife.D、ItdidlittledamagetoTom’scar
Holidaysarecelebratedforallsortsofreasons.Somehonorheroes,otherscommemoratereligiousevents,butApril1ststandso
Thefamousartististhinkingof______hispaintingsintheartgallery.
SteamboatsbegantosailupanddowntheMississippiRiveratthebeginningofthe19thcentury,whichcontributedalottheare
Letushopethat______anuclearwar,thehumanracemightstillsurvive.
A、Jacksurvivedtheaccident.B、Jacksavedalltheotherpassengers.C、Jackhadlittledamagedonetohiscar.D、Jackwastheon
Theteacher______hislessonsaboutFrancewithphotographsofthelocalpeople.
随机试题
关于绷带包扎的注意事项,错误的是
用天然气气举采油、注气和注蒸汽开采时,气举井、注气井、压气站、配气站之间的管线及注蒸汽井口管线应安装(),并无渗漏。
公用事业、稀有金属矿藏开采业等属于寡头垄断的市场类型。()
造成资产经济性贬值的主要原因有()。
下列属于工作分析在人力资源管理中的作用的是()。
当下中国文学描写官斗、职斗、婚斗、家斗的作品比较流行,这些作品中包含了不少对日常生活中权术和心机的描写。这样的写作有可能削弱文学对社会的积极影响。文学有必要与正义结盟.形成诗性正义,以提升生活。作者想表达的主要观点是()。
[*]
假设某银行拥有的资金数是10,现在有4个用户a、b、c、d,各自需要的最大资金数分别是4、5、6、7。若在图a的情况下,用户a和b又各申请1个资金,则银行分配后用户a、b、c、d尚需的资金数分别为(46);假设用户a已经还清所有借款,其情况如图b所示,那么
Beforethemid-nineteenthcentury,peopleintheUnitedStatesatemostfoodsonlyinseason.Drying,smoking,andsaltingcould
Oneofthebasiccharacteristicsofcapitalismistheprivateownershipofthemajormeansofproduction—capital.Theownership
最新回复
(
0
)