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Smart Windows Windows not only let light in to cut down on electricity use...

admin2020-12-24  20
问题 Smart Windows
Windows not only let light in to cut down on electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with an advanced technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between easily.
“ It took us a long time to figure out what a window really is,” says Claes Granqvist. He’s a professor of solid-state physics at Uppsala University in Sweden. “ It’s contact with the outside world. You have to have visual contact with the surrounding world to feel well. ”
So, windows and natural light are important for improving the way people feel when they’re stuck indoors.
Yet, windows are the weak link in a building when it comes to energy and temperature control. In winter, cold air leaks in. When ifs hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air， which can feel so refreshing （使人清新的）, actually sucks up enormous amounts of electricity in buildings around the world.
Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating， glazing （用玻璃覆盖）, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic （发色的）technologies which involve changes of color.
Eleclrochromic （电致色的）windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide （氧化钨）works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and
dark when the charge is removed, that is, when the amount of voltage （电压） is decreased, the window darkens until it's completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark.
One important feature that makes a smart window so smart is that it has a sort of “ memory All it takes is a small change of voltage to turn the window from one state to the other. Then，it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean ths[t massive air conditioning systems may no longer be needed. “ In the future， ” Granqvisl: says， “ our buildings may look different. ”

A smart window is smart mainly because
选项 A it has a sort of memory.
B it can change its size.
C it can change its structure.
D it can change the voltage of the power supply.
答案D
解析
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