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
Watching Microcurrents Flow We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic
Watching Microcurrents Flow We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic
admin
2009-06-15
90
问题
Watching Microcurrents Flow
We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic field generated as electric currents flow through objects, physicists have managed(46). The technology will allow manufacturers to scan microchips for faults, as well as revealing microscopic defects in anything from aircraft to banknotes.
Gang Xiao and Ben Schrag at Brown University in Providence, Rhode Island, visualize the current by measuring subtle changes in the magnetic field of an object and(47)
Their sensor is adapted from an existing piece of technology that is used to measure large magnetic fields in computer hard drives. "We redesigned the magnetic sensor to make it capable of measuring very weak changes in magnetic fields," says Xiao.
The resulting device is capable of detecting a current as weak as 10 microamperes, even when the wire is buried deep within a chip, and it shows up features as small as 40 nanometers across.
At present, engineers looking for defects in a chip have to peel off the layers and examine the circuits visually; this is one of the obstacles(48). But the new magnetic microscope is sensitive enough to look inside chips and reveal faults such as short circuits, nicks in the wires or electro migration -- where a dense area of current picks up surrounding atoms and moves them along. "It is like watching a river flow," explains Xiao.
As well as scanning tiny circuits, the microscope can be used to reveal the internal structure of any object capable of conducting electricity. For example, it could look directly at microscopic cracks in an aeroplane’s fuselage,(49). The technique cannot yet pick up electrical activity in the human brain because the current there is too small, but Xiao doesn’t rule it out in the future. "I can never say never," he says.
Although the researchers have only just made the technical details of the microscope public, it is already on sale, from electronics company Micro Magnetics in Fall River, Massachusetts. It is currently the size of a refrigerator and takes several minutes to scan a circuit, but Xiao and Schrag are working(50).
A. to shrink it to the size of a desktop computer and cut the scanning time to 30 seconds
B. to making chips any smaller
C. to take tiny chips we require
D. to picture the progress of the currents
E. converting the information into a color picture showing the density of current at each point
F. faults in the metal strip of a forged banknote or bacteria in a water sample
选项
答案
B
解析
“obstacle to +名词性成分”的意思是“……的障碍”。
转载请注明原文地址:https://www.kaotiyun.com/show/oRhd777K
本试题收录于:
职称英语理工类基础题库职称英语分类
0
职称英语理工类基础
职称英语
相关试题推荐
Healthworkersthemselvesareawareoftheimportanceofcontinuedtraining.Moreeffectivecontinuingmedicaleducationiscal
IntheUS,aperson’scompanybuyshimorherhealthinsurance.In2004,mostoftheunemployedintheUSwerewomen.
Thesecretsofsleepwereamysteryforcenturiessimplybecausetherewasneitherthemeans(51)them,northeneed.Onlywhenca
She’soneofthesmarteststudentsinthewholeschool.
Thefirstparagraphpointsoutthat______.Itcanbeconcludedfromthepassagethat______.
Myrelationshipwiththeactorsisfundamentaltomyworkasadirector.
Theauthormentions"pick-me-up"toindicatethat______.Whichofthefollowingtellsushowcaffeineaffectssleep?
Mothersandmatchmakers(媒人)havealwaysknownthatnotbeingmarriedisadefinitehealthhazard.Butwhenateamofresearchers
Holonyak’scolleaguesthoughthewouldfailinhisresearchonLEDsatthetimewhenhestartedit.EdithFlanigenistheonly
随机试题
幽门螺杆菌根除治疗的适应证不包括
指出下列汉字哪些是会意字,哪些是形声字,并以这些字为例,说明会意与形声的区别。武潁旗秉惑休
“心理障碍大多为幼年压抑的潜意识冲突而引起”,持这种观点的学派是
下列哪项体征是主动脉瓣狭窄心功能代偿时所不出现的
背景:某城市桥梁工程,采用钻孔灌注桩基础,承台最大尺寸为:长8m,宽6m,高3m,梁体为现浇预应力钢筋混凝土箱梁。跨越既有道路部分,梁跨度30m,支架高20m。桩身混凝土浇筑前,项目技术负责人到场就施工方法对作业人员进行了口头交底,随后立即进行1
新生儿只有少数几种情绪,随着年龄的增长,情绪越来越分化、增多。这说明儿童心理发展具有()的特征。
所有权的继受取得方式包括()。
联邦政府对产业所规定的数量过多的安全管制规则对大企业造成的严重困难要多于小企业。因为大企业做任何事情都是基于更大的规模,所以他们必须调整更加复杂的操作并且花费更多的钱去达到政府的要求。以下哪一项如果正确。将最削弱以上论述?
在现行PC机中,常用存储器地址线中的低10位作输入输出口地址线。设某接口芯片内部有16个端口,该接口芯片的片选信号由地址译码器产生,则地址译码器的输入地址线一般应为( )。
计算机软件的确切含义是()。
最新回复
(
0
)