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
37
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/EisQKKKQ
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 TheInterpersonalSkillsofChildrenWithoutSiblingsManyparentsmayt...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
随机试题
单调有界函数若有间断点,则其类型为( ). A.必为第一类间断点 B.必为
制备冷沉淀的最佳温度应为()。 A.-20℃ B.-80℃ C.37℃
气管切开的位置通常在 A.1~3气管环 B.2~4气管环 C.3~5气管环
(91-93题共用题干) 下面是某求助者的WAIS-RC的测验结果:
B市的甲建筑企业是一般纳税人,2019年2月在A市取得含税建筑收入总额为500万
电力系统在很小的干扰下,能独立地恢复到它初始运行状况的能力,称为()。
患牙有较大的穿髓孔并且根尖孔粗大,炎性牙髓组织呈息肉状经穿髓孔突出,探之不易出血
下列不属于注册土木(岩土)工程师的义务的是()。 A.保证执业工作的质量,并
十二经脉中阳经与阳经(同名经)的交接部位在A.额头部B.面部C.上肢部D.胸腹部E.下肢部
共用题干 一般资料:求助者,男性,26岁,某学校教师。案例介绍:求助者在师范大学硕士研究生毕业后,来到某中学任教。班里的学生经常不听自己的,因此对学生不...