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
公务员
Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but eve
Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but eve
admin
2011-02-02
52
问题
Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri (MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.
"To provide enough power, we need certain methods with high energy density(密度)" ,said Jae Kwon, assistant professor of electrical and computer engineering at MU. "The radioisotope (放射性同位素) battery can provide power density that is much higher than chemical batteries. "
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro/nanoelectromechanical systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.
"People hear the word ’ nuclear’ and think of something very dangerous," he said, "However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems. "
His new idea is not only in the battery’ s size, but also in its semiconductor(半导体). Kwon’ s battery uses a liquid semiconductor rather than a solid semiconductor.
"The key part of using a radioactive battery is that when you harvest the energy, part of the ra- diation energy can damage the lattice structure (晶体结构) of the solid semiconductor," Kwon said, "By using a liquid semiconductor, we believe we can minimize that problem. "
Together with J. David Robertson, chemistry professor and associate director of the MU Re- search Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’ s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.
The text is most probably a______.
选项
A、science news report
B、book review
C、newspaper ad
D、science fiction story
答案
A
解析
本文介绍的是核电池的研究,属于科技新闻报道。故选A。B项表示“书评”,C项表示“报纸广告”,D项表示“科幻小说”,都不符合题意。
转载请注明原文地址:https://kaotiyun.com/show/Zo6q777K
本试题收录于:
中学英语题库教师公开招聘分类
0
中学英语
教师公开招聘
相关试题推荐
明知校舍或者教育教学设施有危险,而不采取措施,造成人员伤亡或重大财产损失的,对直接负责的主管人员应依法追究()责任。
如图,一理想变压器原副线圈匝数之比为4:1,原线圈两端接入一正弦交流电源;副线圈电路中R为负载电阻,交流电压表和交流电流表都是理想电表。下列结论正确的是()。
EightDaysfromjust£299DepartsMay—October2005Includes:Returnflightsfrom8UKairportstoNaplesReturnai
Howshouldoneinvestasumofmoneyinthesedaysofinflation(通货膨胀)?Leftinabankitwillhardlykeepitsvalue,howeverhi
Therearemanykindsoffriends.Somearealways【C1】______you,butdon’tunderstandyou.Somesay"onlyafewwordstoyou,but
______acertaindoubtamongthepeopleastothepracticalvalueoftheproject.
在巴甫洛夫的经典实验中,铃声是作为强化物而出现的。()
Shewaslivingwithheruncle,whohadreturnedfromJapan______.
Everyoneofuscanmakeagreateffortstocut【M1】______offtheuseofenergyinourcountry.Tobeginwith,all【M2】______o
随机试题
系统性思维方法主要包括_____、_____、______。
已知转轴危险截面的直径d=40mm,承受弯矩M=300N.m,扭矩T=800N.m,弯曲应力为对称循环,扭转切应力为脉动循环。轴材料为40Cr钢质,σ-1=355MPa,τ2=200MPa,φσ=0.2,φτ=0.1,设(Kσ)D=2.2,(Kr)D=1.
支气管哮喘的护理措施有( )。
生产经营单位的安全教育培训工作是()的重要途径。
在对建设工程合同实施的控制过程中,承包人合同管理人员进行合同诊断的主要内容之一是( )。
对于各种应收款项,企业应当在实际发生坏账时才确认资产减值损失,同时冲减应收款项。()
2015年12月31日,甲公司对一起未决诉讼确认的预计负债为800万元。2016年3月6日,法院对该起诉讼判决,甲公司应赔偿乙公司600万元;甲公司和乙公司均不再上诉。甲公司适用的所得税税率为25%,按净利润的10%提取法定盈余公积,2015年度财务报告批
()是按父系来标识血缘关系的结果,其主要作用在于“明贵贱”。
下列说法不正确的一项是()。
______proposedtheideaofthesurfacestructureandthedeepstructure.
最新回复
(
0
)