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2012年职称英语考试试题理工类SolarPowerwithoutSolarCells
2012年职称英语考试试题理工类:Solar Power without Solar Cells
导语:元宵以后,2012年职称英语考试时间马上要来到!在历年的职称英语考试中,专家进行分析,每年考试阅读中有很部分题目是来自职称英语考试教材。为此,小编为考生整理了一些理工类教材里面的重点职称英语考试试题供考生参考,希望对考生有帮助!祝学习愉快!
Solar Power without Solar Cells
A dramatic and surprising magnetic effect of light discovered by University of Michigan1 researchers 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 magnetic 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, lights 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 lights magnetic field can also create optic
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