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
14
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 applications
B resources
C differences
D components
答案
D
解析
magnetic components是专有名词,意思是“磁分量"。
转载请注明原文地址:https://ti.zuoweng.com/ti/KisQKKKQ
相关试题推荐
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...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
共用题干 第二篇UsingHumorEffectivelyIfyouintendusinghumorinyourtalktomak...
随机试题
某产品的生产总成本2007年为20万元,比2006年多支出0.4万元,单位成本2
人们通过气象卫星获得大量的信息,这个过程属于( )。
项目建议书的内容不包括()
A公司购进一台设备,原价为360万元,预计净残值为0,预计使用年限为5年,采用年
线路上有各种杆塔用于各种档距,但其导线是相同的,故每米电线的荷载是相同的,该荷载称为电线的单位荷载,用于各种杆塔和绝缘子串的荷载计算。各种电线标称截面很多...
我国发行的债券品种主要有()。 Ⅰ.政府债券 Ⅱ.金融债券 Ⅲ.可转换公司债券 Ⅳ.熊猫债券 A、Ⅰ.Ⅲ.Ⅳ B、Ⅰ.Ⅱ.Ⅲ.Ⅳ C...
属磷酸戊糖通路的酶是()A.6-磷酸葡萄糖脱氢酶B.苹果酸脱氢酶C.丙酮酸脱氢酶D.NADH脱氢酶E.葡萄糖-6-磷酸酶
心脏压塞的特征是()。A.反常呼吸运动B.胸膜腔压力持续升高C.呼吸时纵隔左右扑动D.静脉压升高,心脏搏动微弱,动脉压降低E.胸膜腔引流血量>200ml
下列哪个药物不是合成类抗结核药A.异烟肼B.吡嗪酰胺C.乙胺丁醇D.利福喷汀E.对氨基水杨酸钠
当建设项目为一个单项工程时,其设计概算应采用的编制形式是( )。A.单位工程概算、单项工程综合概算和建设项目总概算二级B.单位工程概算和单项工程综合概算二级