Gliding lizard fills evolutionary gap     

Although the outlandish reptiles  man-eating beasts in science-fiction movies are often scaring to some audience while fascinating to others  they are by no means merely the fancy of Hollywood screenwriters.…… 《中国科学院院刊(英文版)》2007,21(3):137-138

Although the outlandish reptiles and man-eating beasts in science-fiction movies are often scaring to some audience while fascinating to others, they are by no means merely the fancy of Hollywood screenwriters.  相似文献   

World＇s largest robotic telescope goes into operation at CAS     

Lijiang .  one ofthe world largest fully robotic astronomical telescopes  was put into operation on Mayat the CAS Yunnan Observatory  the highest of four professional astronomical observatoriesin China  the only one in the south part of the country.…… 《中国科学院院刊(英文版)》2007,21(3):183-184

Lijiang 2.4, one of the world largest fully robotic astronomical telescopes, was put into operation on 12 May at the CAS Yunnan Observatory, the highest of four professional astronomical observatories in China and the only one in the south part of the country.  相似文献   

“生命砖”构建生命     

W.WaytGibbs郭奕情  徐国恒曾少立 张志文 《科学中国》2004,(7):42-49

生物学家正在建立可通用的DNA部件数据库，并把部件组装到微生物体内，创造出程控生命机器。  相似文献   

香精油的模拟性生产     

Antonio González González  Autonio Galindo  Julio D. Martin  柏丁 《科学对社会的影响》1984,(4)

类萜烯化合物是在许多种香精油,特别是针叶树香精油中所发现的烃类(C_(10)H_1)之一。这里,三位在地理上远隔的实验室中工作的西班牙化学家,完全用技术词汇叙述了他们在转变和合成各种类萜烯化合物方面的工作成果。小的发展中国家的研究小组可以从这篇报道中得到鼓舞。  相似文献   

＂Fly me to the moon＂     

China's first lunar probe Chang'e-I  named after a mythical Chinese goddess who  according to legend  made her home on the moon  blasted off on October from the Xichang Satellite Launch Center in the southwestern province of Sichuan. In addition to making the dream cherished by Chinese people to fly to the moon come true  it is the first step into China's ambitious threestage moon mission  marking a new milestone in the country's space exploration history.…… 《中国科学院院刊(英文版)》2007,21(4):194-195

China's first lunar probe Chang'e-I, named after a mythical Chinese goddess who, according to legend, made her home on the moon, blasted off on 24 October from the Xichang Satellite Launch Center in the southwestern province of Sichuan. In addition to making the dream cherished by Chinese people to fly to the moon come true, it is the first step into China's ambitious threestage moon mission, marking a new milestone in the country's space exploration history.  相似文献   

青海省布青山早古生代末期埃达克岩的发现及其构造意义          下载免费PDF全文

边千韬 Pospelov I.I.李惠民  常承法李继亮 《中国科技期刊研究》2007,23(5):925-934

在青藏高原北部阿尼玛卿蛇绿岩带布青山段首次发现了埃达克岩,它们多呈不规则岩脉状侵入于布青山地区北部早古生代蛇绿混杂岩中.其岩性为花岗-英云闪长岩,主矿物有斜长石、石英、黑云母、角闪石、少量钾长石和辉石;副矿物有榍石、磷灰石、锆石和磁铁矿等.属钙碱系列,具典型（Ⅰ类、O型、HSA）埃达克岩的地球化学特征,表现为：高SiO：（63.65%～71.59%）,高Al2O3（14.81%～16.11%）,高Na2O（4.68%～5.33%）和Na2O/K2O（1.48～3.08,平均2.39）,高Sr（444.08×10^-6～560.41×10^-6）和Sr/Y（50.8～105.3）,HREE强烈亏损,低Yb（0.38×10^-6～0.74×10^-6）,高La/Yb（44.93～90.97）,弱负Eu异常（δEu=0.74～0.90）,富集大离子亲石元素（LILE）,亏损高场强元素（HFSE）,Ba、Pb正异常而Nb、P负异常.获得布青山埃达克岩的锆石TIMS U-Pb年龄为402±24Ma.布青山埃达克岩熔体来自俯冲的昆祁秦洋壳（含海洋沉积物）在石榴石角闪岩相条件下部分熔融,主要残留相为石榴石（±角闪石）.布青山埃达克岩的发现指示早古生代末期洋壳（昆祁秦多岛洋的一部分）俯冲作用的存在,俯冲方向朝北（现在方位）,此前,俯冲带发生长时间的向洋迁移,早古生代末期俯冲带已后退到阿尼玛卿蛇绿混杂岩带以南;暗示典型埃达克岩也可以形成于洋壳俯冲晚期;提示阿尼玛卿蛇绿岩带可能有与典型埃达克岩有关的Au、Ag、Cu、Mo等热液和斑岩矿床.  相似文献   

航空和社会     

Géo R.Besse  金同超 《科学对社会的影响》1981,(3)

飞机是否飞得太高了?这个不必回答、只是为了加强印象的反问句表明这样一种关切:今天飞机的航线并不象从前的商业和旅行的非常大的交通干线——沙漠和海洋——一样,也许不会对航线通过的国家的民族和文化产生相对来说较深远的影响。诚然,飞机用于空中运输正在不断地使地球变小,而飞机用于空中作业,创造了许多人道主义的或科学上的奇迹。“但是”,作者问道,“飞机是否深入到了人的内心世界?是否改变了人的心理活动或丰富了人的文化生活?”  相似文献   

质疑氢经济     

MatthewL.Wald何毓嵩  杨光 《科学中国》2004,(7):34-41

布什总统宣布了一项价值17亿美元的汽车研究项目，旨在开发减少对大气的污染，并降低美国对进口石油依赖性的汽车。没过几个月，2003年秋天，丰田公司就带了这样两款汽车来到华盛顿特区。其中一款是商用混合型小轿车，它配有传统汽油内燃发动机，另以一台电池驱动电动发动机为辅助。这款轿车大约80千米耗油1加仑(3.8升)，  相似文献   

The visual theology of Victorian popularizers of science. From reverent eye to chemical retina     

Lightman B 《Isis; an international review devoted to the history of science and its cultural influences》2000,91(4):651-680

This essay examines the use of visual images during the latter half of the nineteenth century in the work of three important popularizers of science. J. G. Wood, Richard Proctor, and Agnes Clerke skillfully used illustrations and photographs to establish their credibility as trustworthy guides to scientific, moral, and religious truths. All three worked within the natural theology tradition, despite the powerful critique of William Paley's argument from design set forth in Charles Darwin's Origin of Species (1859). Wood, Proctor, and Clerke recognized that in order to reach a popular audience with their message of divine wonder in nature, they would have to take advantage of the developing mass visual culture embodied in the new pictorial magazines, spectacles, and entertaining toys based on scientific gadgets emblematic of the reorganization of vision. But in drawing on different facets of the emerging visual culture and in looking to the images produced by the new visual technologies to find the hand of God in nature, these popularizers subtly transformed the natural theology tradition.  相似文献   

应用放射性钴进行深部治疗     

А.М.柯諾湼科  李婉如 《科学大众》1956,(9)

現今在射線治疗中,特别是在深部治疗中,越来越广泛地应用治疗机,人工放射性同位素钴-60是這些治疗机中的贯穿射線源。远距离钴治疗机所以能够广泛应用,是因为在許多  相似文献