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Alfalfa's Bright Prospects苜蓿的大好前景 Biofuel,plastics,and livestock1 feed are among themany potential uses for new, cross-bred2 varieties ofalfalfa.(I)Using funds earmarked for bioenergy pro-jects,agricultural researchers are crossing thick-stemmedEuropean alfalfa with modern varieties developed fordairv feed,creating a variety that can be used for bothfeed and fuel.Researchers also hope to transform alfalfaso that it can be used to manufacture biodegradable3plastic.In addition,they’ve have identified genes that en-hance alfalfa’s ability to absorb nitrogen4 in the soil-atrait that could Rive the new varieties a vital role in pre-venting water pollution by fertilizers5. 相似文献
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Predicting the Wind 预测风向To sell their energy, wind-farm operators need to predict when they can deliver the power, but wind is skittish(多变的)and unpredictable. Researchers are hoping that artificial-intelligence techniques will make wind-energy forecasts more accurate. A method developed at Northern Ireland' s University of Ulster assesses past wind-flow patterns to predict 相似文献
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Power from Nanolight 纳米光能量Tiny rings of light called optical vortices(漩涡) may one day be harnessed as power sources for micro electro mechanical devices (MEMs) . The optical vortices rapidly spin(旋转) microscopic spheres(球体) in surrounding fluid. Since they have no moving parts, they are a better option for MEMs motors than electrostatic(静电的) or magnetic drives, which move slowly and wear out quickly, says physicist David Grier of the University of Chicago. The devices could be used to drive nanorobots and other microdevices. 相似文献
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Pictures You Can Walk through可以穿越的图片A unique new projection platform-foq-will allowviewers to walk through images on display.The fogscreen,developed by researchers at Tampere Universityof Technology in Finland.injects digital data into a lami-nat(薄片状的),nonturbulent(非扰动的)airflow,creating athin and swiftly flowing wall that viewers can simply walkthrough.The fog screen could find wide applications inadvertising,science museum displays,public presenta-tions,training,and gaming. 相似文献
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Cindy Wagner 《海外英语》2003,(4)
The South's Stroke Belt南部的中风多发地带A "Stroke Belt" has been identified in the southeastern United States, where stroke mortality rates are 150% of the national average. An even deadlier "Stroke Buckle" exists a-long that region' s coastline, where deaths from strokes are 相似文献
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Data Dump from Space 来自太空的数据转储Future spacecraft will generate staggering amounts of data; the challenge will be to collect, analyze, and use it. In 2010, the European Space Agency's Gaia mission will seek new objects in space and collect data about known objects, potentially generating a database of one petabyte [2 to the 50th power (1.1 quadrillion) bytes]. Such a database would take 30 years to process with today' s computers, I so onboard software will help narrow the range of objects observed, cutting the flow of data back to Earth. 相似文献
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Wind Power for Homes家用风力能源Rooftop wind turbines and generators could potentially provide 15% of a household’S energy needs.Recently a Scottish company called Windsave produced ashoebox-sized generator whose blades turn on breezes ofjust 3 mph.Power is fed directly into households’electricity supply.generating up to 750 watts-enough to 相似文献
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