首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
Solar Power without Solar Cells A dramatic and surprising magnetic effect o...
Solar Power without Solar Cells A dramatic and surprising magnetic effect o...
admin
2020-12-24
3
问题
Solar Power without Solar Cells
A dramatic and surprising magnetic effect of light discovered by University of Michigan researchers could lead to solar power without traditional semiconductor-based solar ceils.
The researchers found a way to make an “optical (光的)_____ (51),” said Stephen Rand,a professor in the departments of Electrical Engineering and Computer Science,Physics and Applied Physics.
Light has electric and magnetic _____ (52) . Until now, scientists thought the effects of the magnetic field were so weak that they could be_____(53). What Rand and his colleagues found is that at the right intensity, when light is traveling through a material that does not (54) electricity,the light field can generate magnetic effects that are 100 m川ion times stronger than previously expected. Under these circumstances,the magnetic effects develop strength _______(55) to a strong electric effect.
“This could lead to a new kind of solar cell without semiconductors and without absorption to produce charge separation,” Rand said. “In solar cells,the______(56) goes into a material,gets absorbed and creates heat. Here, we expect to have a very low heat load. Instead of the light being absorbed,energy is stored in the magnetic moment. Intense magnetization can be induced by intense light and then it is ultimately capable of providing a capacitive power______(57) .” What makes this possible is a previously undetected brand of “ optical rectification (修正),” says William Fisher,a doctoral student in applied physics. In traditional opticd rectification,light’s electric field causes a charge separation,or a pulling _______(58) of the positive and negative charges in a material. This sets up a voltage,similar to _______(59) in a battery.
Rand and Fisher found that under the right circumstances and in right types of materials, the light’s magnetic field can also create optical rectification. The light must be shone through a_____ (60) that does not conduct electricity,such as glass. And it must be focused to an intensity of 10 million watts per square centimeter. Sunlight isn’t this______(61) on its own,but new materials are being sought that would work at lower intensities,Fishersaid.
“In our most recent paper,we show that incoherent (非相干的)light like sunlight is theoretically almost ______ (62) effective in producing charge separation as laser light is,” Fisher said.
This new ______(63) could make solar power cheaper, the researchers say.They predict that with improved materials they codd achieve 10 percent efficiency in converting solar power to useable energy. That’s equivalent to today’s commercial solar cells.
“To manufacture modem solar cells, you have to do ______ (64) semiconductor processing,” Fisher said. “All we would need are lenses to focus the light and a fiber to guide it. Glass works for ______ (65). It’s already made in bulk, and it doesn’t require as much processing. Transparent ceramics (陶瓷材料)might be even better. ”
选项
A interactive
B selective
C extensive
D intensive
答案
C
解析
本文倒数第二句... it (glass) doesn’t require as much processing.提示semiconductor processing 前面要填 extensive。
转载请注明原文地址:https://ti.zuoweng.com/ti/RasQKKKQ
相关试题推荐
Mancannotexistwithoutwater.A:expand B:riseC:live D:quit
Lackofmoneywillhaveanadverseeffectonourresearchprogramme.A:diverseB
31ThispassageismainlyaboutAthehumangrowthhormone.Btheeffectsofal
31ThispassageismainlyaboutAthehumangrowthhormone.Btheeffectsofal
WealmostranintoaRolls-Roycethatpulledoutinfrontofuswithoutsigna...
共用题干 第二篇DoubleEffectTheSupremeCourt'sdecisionsonphysician-assistedsu...
共用题干 第二篇DoubleEffectTheSupremeCourt'sdecisionsonphysician-assistedsu...
共用题干 第二篇DoubleEffectTheSupremeCourt'sdecisionsonphysician-assistedsu...
共用题干 DoubleEffectTheSupremeCourt'sdecisionsonphysician-assistedsuici...
共用题干 DoubleEffectTheSupremeCourt'sdecisionsonphysician-assistedsuici...
随机试题
仓储在物流系统中起着缓冲、调节和平衡的作用。()(2005年5月助理物流师试题
成本的事前控制活动主要有()。 A.物流配送中心的建设控制 B.物流设施、
下列哪项符合M3的MIC分型 A、CD13+,CD33+,HLA-DR,t(1
哈瑞马科维茨于20世纪50年代提出的不确定条件下的(),成为现代风险管理的重要
电线电缆截面面积的选型原则应符合下列规定( )。
下列属于纳税义务人可以在货物进出口前先海关申请延期缴纳税款的情形是()。 A
正畸中Ⅱ°以上牙齿松动,不应做的处理是A.拔除B.控制龈炎C.采用少量调,去除创伤D.必要时可做板E.暂停加力,将松动牙与邻牙结扎固定
某单位的图书馆书库采用无管网七氟丙烷气体灭火装置进行防护,委托消防检测机构对该气体灭火系统进行检测。下列检测结果中,符合现行国家消防技术标准要求的有()。A.
大肠主A.汗B.尿C.津D.液E.泪
关于人身保险合同的说法,正确的是()。A.人身保险的投标人在保险事故发生时,应当对被保险人具有保险利益B.人身保险合同的投保人应当一次性支付全部保险费C.