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
41
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
下列结论中正确的是( ). A.若y=f(x)在x0点连续,则f′(x0)存
食管心房调搏时采用S1S1刺激可终止室上性心动过速的机制为 A.刺激的频率适当
()不属于直接传授型培训法的具体方式。
D
女性,20岁,因低热、腹痛诊断为结核性腹膜炎,近日来呕吐、腹胀、未解大便。查体:
举例说明如何利用系统脱敏法矫正学生的心理障碍。
根据《中华人民共和国行政处罚法》的规定,行政处罚决定中听证程序包括()。A:行政机关根据事实、理由及依据,不用告知当事人,可直接作出行政处罚B:当事人对直接行
关于盆式挖土的说法,正确的是()。A.支护结构受荷时间长B.有利于减少围护墙的变形C.大量的土方可以直接外运D.对支护结构受力不利
关于应对方式问卷,正确的说法包括()。 (A)“退避-自责”的组合可解释为不成熟型 (B)评定的时间范围是最近一年 (C)属于他评工具 (D)...
甲公司为增值税一般纳税人,2019年4月10日将入账成本为195万元的一批烟叶委托乙公司(增值税一般纳税人)加工成烟丝。2019年5月14日,甲公司收回加...