首页
登录
职称英语
Few human records survive for long, the 16 000-year-old Paleolithic cave pai
Few human records survive for long, the 16 000-year-old Paleolithic cave pai
游客
2024-02-09
11
管理
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. [br] What will happen when current is given to the nanotube?
选项
A、The particle will move from one end to the other.
B、Electronic information will be displayed.
C、The stored digital information will appear.
D、The particle will be scattered in the tube.
答案
A
解析
细节辨认题。第二段主要讲述了存储单元的工作原理:电极连接到纳米管的一端,通电时电极就会使管内的粒子来回移动,故答案为A)。
转载请注明原文地址:https://tihaiku.com/zcyy/3436121.html
相关试题推荐
ThefirstbabyinBritaintosurviveahearttransplantcelebratedher18th
ThefirstbabyinBritaintosurviveahearttransplantcelebratedher18th
ThefirstbabyinBritaintosurviveahearttransplantcelebratedher18th
ThefirstbabyinBritaintosurviveahearttransplantcelebratedher18th
ThefirstbabyinBritaintosurviveahearttransplantcelebratedher18th
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
Fewhumanrecordssurviveforlong,the16000-year-oldPaleolithiccavepai
随机试题
Whatisaportcity?Asacenterofland-seaexcha
FireInstructionThepersondiscov
下列文书的内容不具有前瞻性、预测性的是()。A.总结 B.计划 C.调查报
A. B. C. D.
与外墙内保温相比,外墙外保温的优点在于()。A.有良好的建筑节能效果 B.有利
德育网络是整合校内外各种德育力量,由各种社会组织及其沟通渠道构成的组织体系。下列
我国目前推荐的临床常规测定血浆葡萄糖的方法是A.葡萄糖氧化酶-过氧化物酶法B.葡
某±500kV直流线路,试根据规程规定回答下列问题。 靠近±500kV直流线
30岁女性,既往健康,晨起发病,四肢无力,进行性加重,2天后来诊。查:脑神经正常
单代号网络计划的自由时差等于()。 A.该工作与紧前工作时间间隔的最
最新回复
(
0
)