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王静敏 《希望月报(上半月)》2006,(22)
盛夏的午后,风云突变,铅色的阴云由西北方压了过来。远处雷声轰鸣,一会儿狂风大作,大树的枝条被吹得前摇后晃,忽然天空掠过一道闪电,大雨顿时瓢泼而下。大约一刻钟的功夫,雨过天晴,太阳又钻出云彩。那雨后的天空蔚蓝如洗,只有几朵淡淡的白云浮在空中,霎时,从西北天际间,出现一条七色的彩虹,与蓝天、白云相映衬,令人心愉神爽。于是,我不禁想起了“赤橙黄绿青蓝紫,谯持彩练当空舞”的诗句。 相似文献
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恍恍惚惚的时候,初中三年的阳光竟“简单”地过去了。三年里我被浸泡在茶水一般的日子里,有过一次两次的失败,有过几次过眼云烟的成功。回头看我在清水泡出的茶香里沉浮,有过苦涩,也有过甜蜜,更多 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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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