2012年职称英语理工类A级考试真题

　　Solar Power without Solar Cells【没有太阳能电池的太阳能】

　　A dramatic and surprising magnetic effect of light discovered by University of Michigan1researchers could lead to solar power without traditional semiconductor-based solar cells.

　　The researchers found a way to make an “optical 1 , ” said Stephen Rand, a professor in the departments of Electrical Engineering and Computer Science, Physics and Applied Physics.

　　Light has electric and magnetic components. Until now, scientists thought the 2 of the maghetic field were so weak that they could be ignored. What Rand and his colleagues found is that at the right intensity, when light is traveling through a material that does not conduct electricity, the light field can generate magnetic effects that are 100 million times stronger than

　　3 expected. 4 these circumstances, the magnetic effects develop strength equivalent 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 5 goes into a material, gets absorbed and creates heat. Here, we expect to have a very low heat load2. Instead of the light being absorbed, energy is stored in the magnetic moment3. Intense magnetization can be induced by intense light and then it is ultimately capable of providing a capacitive power 6 ”What makes this possible is a previously undetected brand of “optical rectification4, ” says William Fisher, a doctoral student5 in applied physics. In traditional optical rectification, light's electric field causes a charge separation, or a pulling 7 of the positive and negative charges6 in a material. This sets up a voltage, similar to 8 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 through7 a

　　9 that does not 10 electricity, such as glass. And it must be focused to an intensity of 10 million watts per square centimeter8. Sunlight isn't this intense 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 light9 like sunlight is theoretically almost as 11 in producing charge separation as laser light is, ” Fisher said.

　　This new 12 could make solar power cheaper, the researchers say. They predict that with improved materials they could achieve 10 percent efficiency in 13 solar power to useable energy. That's equivalent to today's commercial-grade solar cells.

　　“To manufacture 14 solar cells, you have to do extensive semiconductor processing, ” Fisher said. “All we would need are lenses to focus the light and a fiber to guide it. Glass works for 15 It's already made in bulk10, and it doesn't require as much processing. Transparent ceramics might be even better. ”

　　练习：

　　1. A microscope B instrument C fiber D battery

　　2. A modifications B effects C applications D results

　　3. A frequently B privately C previously D formally

　　4. A Under B At C On D Over

　　5. A fight B electricity C chemical D magnetism

　　6. A plant B equipment C source D line

　　7. A down B up C together D apart

　　8. A this B that C those D it

　　9. A material B lens C meter D detector

　　10. A produce B convey C use D conduct

　　11. A remote B poor C effective D rare

　　12. A prototype B skill C technique D miracle

　　13. A converting B obtaining C delivering D transmitting

　　14. A compact B modem C durable D handy

　　15. A others B some C all D both

　　答案

　　1. D 　　2. B 　　3. C 　　4. A 　　5. A 　　6. C 　　7. D 　　8. B

　　9. A 　　10. D 　　ll. C 　　12. C 　　13. A 　　14. B 　　15. D

　　考试 答案 Solar Power without Solar Cells

　　原文中标注红色为今年考试的题目!

　　1、A battery 2、D components

　　3、C ignored 4、C conduct

　　5、A equivalent 6、D light

　　7、D source 8、D apart

　　9、A that 10、B material

　　11、C intense 12、A as

　　13、D technology 14、C extensive

　　15、C both