雅思阅读模拟文章—time to cool it-智课教育出国考试.pdfVIP

智 课 网 雅 思 备 考 资 料 雅思阅读模拟文章—Time to cool it-智课教育出国考试 雅思阅读文章都来源于各大著名的报刊杂志和网站，比如经济学人 、美国地理杂志、新科学人等等。所以，小编整理了一些来自于这些网 站的模拟题，给大家练习。今天分享的就是雅思阅读模拟文章—Time to cool it。 Time to cool it Dec 13th 2006 From The Economist print edition 1 REFRIGERATORS are the epitome of clunky technology: solid, reliable and just a little bit dull. They have not changed much over the past century, but then they have not needed to. They are based on a robust and effective idea--draw heat from the thing you want to cool by evaporating a liquid next to it, and then dump that heat by pumping the vapour elsewhere and condensing it. This method of pumping heat from one place to another served mankind well when refrigerators main jobs were preserving food and, as air conditioners, cooling buildings. Todays high-tech world, however, demands high-tech refrigeration. Heat pumps are no longer up to the job. The search is on for something to replace them. 2 One set of candidates are known as paraelectric materials. These act like batteries when they undergo a temperature change: attach electrodes to them and they generate a current. This effect is used in infra-red cameras. An array of tiny pieces of paraelectric material can sense the heat radiated by, for example, a person, and the pattern of the arrays electrical outputs can then be used to construct an image. But until recently no one had bothered much with the inverse of this process. That inverse exists, however. Apply an appropriate current to a paraelectric material and it will cool down. 3 Someone who is looking at this inverse effect is Alex Mischenko, of Cambridge University. Using commercially available paraelectric film, he and his colleagues have generated temperature drops five times bigger than any previously recorded. That may be enough to change the phenomenon from a laboratory curiosity to something with commercial applications. 4 As to what those applications might be, Dr Mi