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
49
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
对于资料反映不详、与实际不符或在资料中未反映管线真实情况的,应向规划部门、管线管
由于建设工程()等因素,导致建设工程安全生产的管理难度很大。
除去饮片中混有铁屑的方法是
多聚甲醛封药的时间是
护患关系后果的主要责任者是A.患者B.患者家属C.护士D.医院领导E.医疗机构
早期的ARDS患者其肺部X线检查结果是A.完全正常B.无明显改变C.呈条状阴影D.双肺致密阴影E.双肺部分斑片状阴影
计算存在死亡危险,等于A.平均死亡率×组合危险分数B.平均死亡概率×危险降低年龄C.平均死亡概率×组合危险分数D.平均死亡概率×危险分数E.预期死亡概率
共用题干 RelievingthePain"Exercisemaybethebesttreatmentofchronicpain,...D
采购数量小或者采购物品对生产经营活动影响不大的商品,适合的采购方式是()。A.直接采购B.间接采购C.反向拍卖D.招标采购
下列功能模块中不需要为账务处理系统生成记账凭证的有()A.应收管理模块B.存货管理模块C.应付管理模块D.会计报表模块