首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Solar Power without Solar Cells A dramatic and surprising magnetic effect of light discovered by University of Michigan rese
Solar Power without Solar Cells A dramatic and surprising magnetic effect of light discovered by University of Michigan rese
admin
2012-12-28
28
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 cells.
The researchers found a way to make an "optical【C1】______," said Stephen Rand, a professor in the departments of Electrical Engineering and Computer Science, Physics and Applied Physics.
Light has electric and magnetic【C2】______Until now, scientists thought the effect of the magnetic field were so weak that they could be【C3】______What Rand and his colleagues found is that at the right intensity, when light is traveling through a material that does not【C4】______electricity, the light field can generate magnetic effects that are 100 million times stronger than previously expected. Under these circumstances, the magnetic effects develop strength【C5】______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【C6】______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【C7】______What makes this possible is a previously undetected brand of "optical rectification," says William Fisher, a doctoral student in applied physics. In traditional optical rectification, light’s electric field causes a charge separation, or a pulling【C8】______of the positive and negative charges in a material. This sets up a voltage, similar to【C9】______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【C10】______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【C11】______on its own, but new materials are being sought that would work at lower intensities, Fisher said.
"In our most recent paper, we show that incoherent light like sunlight is theoretically almost 【C12】______effective in producing charge separation as laser light is," Fisher said.
This new【C13】______could make solar power cheaper, the researchers say. They predict that with improved materials they could achieve 10 percent efficiency in converting solar power to useable energy. That’s equivalent to today’s commercial-grade solar cells. "To manufacture modern solar cells, you have to do【C14】______semiconductor processing," Fisher said. "All we would need are lenses to focus the light and a fiber to guide it. Glass works for【C15】______It’s already made in bulk, and it doesn’t require as much processing. Transparent ceramics might be even better. "
【C3】
选项
A、concerned
B、ignored
C、expected
D、noticed
答案
B
解析
本题考查句意。该句的意思是“科学家们认为磁场的效果很微弱,可以忽略”。因此,ignore(忽视、忽略)是符合句子含义的。concerned“相关的”,expected“期望的”,noticed“关注的”均不正确。故选B。
转载请注明原文地址:https://kaotiyun.com/show/WlLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
FermiProblemOnaMondaymorninginJuly,theworld’sfirstatombombexplodedinNewMexicodesert.Fortysecondslater,t
Shehasagreatcapacityforlearninglanguages.
MyLifeatRendaIlearnedveryquicklythatbeingateachingassistant(TA)attheUniversityofIowawouldbedifferentfrom
LivingAloneCouldBeGoodforYourWeightGoodnewsforpeoplelivingalone:Aforthcomingpapershowsthatsingleadults—o
DeforestationandDesertification(沙漠化)TheSahelzoneliesbetweentheSaharadesertandthefertilesavannahs(热带大草原)ofnort
Animal’s"SixthSense"AtsunamiwastriggeredbyanearthquakeintheIndianOceaninDecember,2004.Itkilledtensofthousan
Choosingatopicforresearchisimportantinthatyouwillputagreatdealoftimeandenergyintoit.Thepassageismostli
AnimalsintheDesertSomedesertanimalscansurvivetheverystrongsummerheatanddrynessbecausetheyhaveveryunusualcha
EasyLearningStudentsshouldbejealous.Notonlydobabiesgettodozetheirdaysaway,butthey’vealsomasteredthefineart
Sandrecameacrossanimportantletteryesterdaywhilecleaningthedesk.
随机试题
治疗噎膈气虚阳微证,应首选()
下列各项中,与货币资金持有量呈反向变动关系的是()
Ourkitchenisamess.We______anycleaningforweeks.
患者男性,50岁。因旅游途中进食海鲜后1天出现右足趾及趾跖关节剧烈疼痛,伴红肿,有发热。既往发作过两次,每次发作一周左右可自行缓解,曾用过青霉素治疗效果不明显。查体:痛苦面容,呻吟。体温39.2℃,右足趾及趾跖关节红肿、压痛,局部皮温增高。血白细胞11.4
下列关于晶状体的叙述,正确的是
根据公路工程无机结合料稳定材料试验规程,进行含水率试验时,对有机质土尽量采用烘干法,并适当降低烘箱温度。()
下列可以计算建筑面积的是( )。
A公司于2×10年12月31日取得一栋写字楼并对外经营出租,取得时的入账金额为2000万元,采用成本模式计量,采用直线法按20年计提折旧,预计无残值,税法折旧与会计一致;2×12年1月1日,A公司持有的投资性房地产满足采用公允价值模式条件,2×12年1月
“巧妇难为无米之炊”,这句俗话体现的哲学含义是:
以下是系统设计应该遵循的基本原则的描述。Ⅰ.可以根据具体缺点随意更改系统功能和性能要求Ⅱ,权衡系统的投资和效益的比例Ⅲ.保证系统的效率和质量Ⅳ.体现系统的可扩展性和可适应性Ⅴ.追求利用先进的技术设计系统其中正确的有()。
最新回复
(
0
)