狮子和标签     

谢·米哈尔科夫 《世界中学生文摘》2005,(8)

海水之所以是海水,是因为它从不装入鱼缸中。狮子醒来,发现在它的尾巴上挂上了标签。上面写着“驴”,有编号,有日期,有圆圆的公章,旁边还有个签名……狮子很恼火,它满怀气愤来到野兽中间。“我是不是狮子?”它激动地质问。“你是狮子,”胡狼慢条斯理地回答,“但依照法律,我看你是一头驴!”“怎么会是驴?”我从来不吃干草!我是不是狮子,问问袋鼠就知道。”“你的外表,无疑有狮子的特征,”袋鼠说,“可具体是不是狮子我又说不清!”“蠢驴!你怎么不吭声?”狮子心慌意乱,开始吼叫,“难道我会像你?畜生!我从来不在牲口棚里睡觉!”驴子想了片刻,说…  相似文献   

Geneticists told to sing for their supper     

Brown P 《New scientist (1971)》1991,131(1784):8

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ON THE REE ACROSS THE PERMIANTRIASSIC BOUNDARY IN SOUTH CHINA     

Zhou Yaoqi Chai Chifang Mao Xueying Ma Shulan Ma Jiangguo 《中国科学院研究生院学报》1992,(2)

This paper discusses the INAA results of REE in clays atand near some Permian/Triassic boundaries of South China.It showsthat the REE patterns of boundary clays differ from those of non-boundary clays.One difference is that the boundary clays are moreenriched in LREE,with steeper slope of REE and a smaller Eu nega-tive anomaly than the non-boundary clays.Another difference is that theboundary clays show a small Ce negative anomaly,but no Ce anomalyoccurs in the non-boundary clays.From these REE patterns and some other experimental facts,it isproposed that the P/T boundary clay may be a mixed product consistingof the acidic-intermediate ash and the upper crust substance representingsputtering component,and the calculated fraction of the former andlatter is 7/3.  相似文献   

海军的新型声纳会伤害鲸鱼吗     

MichaelW．Robbins  张帆 《科学与生活》2003,(5):65-65

经过多年的争论，国家海洋渔业机构于去年夏天批准美国海军使用新型低频声纳系统查找敌方潜艇的位置。这一许可促使自然资源保护委员会和一个由其他环境组织组成的联盟向联邦法院控告海军，称这种声纳将对海洋生命造成巨大的危害。  相似文献   

模拟碳的地球化学循环     

RobertA．Berner  AntonioC．Lasaga  石实译  韩德华 《科学中国》1989,(7):15-19

引起大气二氧化碳缓慢增加的自然界地球化学过程，通过温室效应很可能引起了过去全球变暖的一些地质时期的出现。  相似文献   

等离子体粒子加速器     

JohnM．Dawson  黄炜译  王世德 《科学中国》1989,(7):11-14

等离子体中产生的电场能够使电子加速以获得高能。这个方法可望使场强比能量最大的传统加速器的场强高出10，000倍。  相似文献   

太阳能电池     

D．E 《科学中国》1990,(12):76-77

可弯曲的轻质太阳能电池展开竞争  相似文献   

探反物质     

迈克尔．莫耶  陈仁怀 《科技新时代》2002,(6):67-71

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The role of an NHS library service in the UK: the perceptions of clinical managers in Portsmouth, UK     

Blagden P 《Health information and libraries journal》2007,24(2):110-117

BACKGROUND: Portsmouth NHS Library Service is exploring methods of raising its profile within its host organization and wishes to demonstrate its contribution to achieving organizational goals, perhaps by means of an impact study. OBJECTIVE: The objective of this small scale study, regarded as a possible precursor to an impact study, was to identify areas where there is potential to increase awareness among clinical managers of the Library's contribution. METHODS: An e-mail survey was sent to clinical managers to elicit their opinions regarding the contribution of the Library Service to organizational goals. RESULTS: Perhaps unsurprisingly, the role of the Library Service in education, research and effectiveness was most widely recognized. Of responses, 30/42 (71%) rated it as 'very important' and a further 11 (26%) rated it as 'important'. The low appreciation of the Library Service to Clinical Services is a disappointment in view of the body of research evidence. Only 12 respondents (29%) thought that the Library Service contributed 'significantly' by 'supporting informed and timely clinical decision making'. CONCLUSION: The study suggested areas where there might be scope to raise awareness of the Library contribution. In considering how best to achieve this, the benefits need to be weighed against the resource implications. Portsmouth NHS Library Service decided to increase its marketing efforts but not to carry out an impact study in the short term.  相似文献   

参与Google图书搜索项目的图书馆及其数字拷贝     

JillE．Grogg  林芳 《图书情报工作动态》2007,(7):14-18

有人认为Google大量地数字化图书馆的馆藏图书,犹如给实体图书馆和图书馆员敲响了丧钟,还有一些人则认为Google此举是对版权法的挑衅。Google如何处理那些数字化图书是媒体报道的焦点。尽管Google的意图为人们所津津乐道,每个人都在期待着法院对版权纠纷的判决,人们也不禁想要知道：参与Google图书搜索项目的图书馆,如何使用那些从合作中得到的数字化拷贝呢？  相似文献