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
25
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 electricity
B light
C chemicai
D gas
答案
B
解析
在本句中,进入solar cell (太阳能电池)转化为heat的只能是light (光)。
转载请注明原文地址:https://ti.zuoweng.com/ti/0isQKKKQ
相关试题推荐
CreatingaWorldwithoutSmoking Smokingwillbebannedinallpubs,dubsan...
CreatingaWorldwithoutSmoking Smokingwillbebannedinallpubs,dubsan...
CreatingaWorldwithoutSmoking Smokingwillbebannedinallpubs,dubsan...
CreatingaWorldwithoutSmoking Smokingwillbebannedinallpubs,dubsan...
CreatingaWorldwithoutSmoking Smokingwillbebannedinallpubs,dubsan...
共用题干 TheInterpersonalSkillsofChildrenWithoutSiblingsManyparentsmayt...
共用题干 TheInterpersonalSkillsofChildrenWithoutSiblingsManyparentsmayt...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
随机试题
脑卒中患者偏瘫侧肢体不能输液,其主要原因是 A、影响偏瘫侧肢体康复 B、易
钩端螺旋体的保菌和带菌动物很多,其中最主要的是 A.狗和羊 B.狗和猪 C
(70-73题共用备选答案) A.0~20 B.20~25以下 C.20~
一个法人只能投资设立一个一人有限责任公司,该一人有限责任公司不能再投资设立新的一
急性胆囊炎致病菌主要来源于
下列房地产市场参与者中,属于专业顾问的是()。
经济运行是指各种( )利用各种生产要素进行生产、流通、分配、消费等经济活动的过
患儿男,12岁,高热2周后热退,但出现意识不清,失语,喉中痰鸣。查体:舌质红绛,舌苔黄,脉滑。此病例的治法应为A.搜风通络或养阴熄风B.开窍泄浊或豁痰清心
根据建筑安装工程费用项目组成,规费是指政府和有关权力部门规定必须缴纳的费用,包括( )。A.工程定额测定费B.检验试验费C.社会保险费D.住房公积金E.
电子商务对企业经营管理的影响是多方面的,其中在组织形式方面的变化主要体现为()A.组织结构由金字塔型向扁平型转变B.企业组织信息传递的方式由单向的“一对多”