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
91
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
D
解析
manage to +v. 是“设法做成”的意思。picture在此是动词,“to picture the progress of the currents”意为“绘出电流运行图”。
转载请注明原文地址:https://kaotiyun.com/show/bRhd777K
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
Examinationpapersoftheclassweremarkedwithoutbias.
MyExperienceaboutEnglishOnesummernight,onmywayhomefromworkIdecidedtoseeamovie.Iknewthetheatrewouldbeair
FriendsMayBeKeytoLivingLongerLookingforthesecretofalonglife?Lookcloselyatyourfriends.Newresearchsugges
Sportisnotonlyphysicallychallenging,butitcanalsobementallychallenging.Criticismfromcoaches,parents,andotherte
Itcanbeinferredfromtheopeningsentenceofthefirstparagraphthatmedicalworkers______.Theprimarypurposeofthispa
Aftermakingobservationsforaweekintheplant,theindustrialengineermadeanumberofveryconstructivesuggestionsinan
ComparedwiththetotalnumberofBritain’sNationalHealthServicehospitals,thehospitalswhichhaveartcollectionsisonly
AdultEducationVoluntarylearninginorganizedcoursesbymaturemenandwomeniscalledadulteducation.Sucheducationisoff
VitaminAcanbefoundinmeat.IfyouintakeenoughvitaminA,youwon’tgetlungcancerwithoutgivingupsmoking.
ComputerNeedsEmotionThenextbigbreakthroughinartificialintelligencecouldcomefromgivingmachinesnotjustmorelo
随机试题
既能清热泻火,又可滋阴润肺的药物是
下列加下划线词语解释有误的一项是()
A.非营利性中医医疗机构B.中医药人员培训规划C.中医药专业技术职务任职资格评审D.与中医药有关的评审或者鉴定活动E.获得定点资格的中医医疗机构依照国家有关规定享受财政补贴、税收减免等优惠政策的是
按照《中华人民共和国城市规划法》的规定,城市新区开发和旧城改建必须坚持()原则。
保荐代表人出现()情形之一的,中国证监会撤销其保荐代表人资格;情节严重的,对其采取证券市场禁入的措施。
如何理解意境的基本特征。
甲欲杀死乙,在乙饭碗里投放毒药,不料朋友丙分食了乙的饭菜,甲为了杀死乙,没有阻止丙,结果导致乙和丙均中毒死亡。甲对丙死亡所持的心理态度是()。
社会整合:是指调整或协调社会各部分之间的矛盾和冲突,使整个社会成为一个统一的运行良好的体系的过程。通过社会整合,使社会体系中既互相独立又互相联系的各个部分之间互相顺应,形成均衡状态。根据上述定义,下列不属于社会整合的是()。
下列范畴中,属于通货紧缩的标志有()持续下降。
【B1】【B9】
最新回复
(
0
)