【摘 要】
：
The dream of radiokrypton dating began in 1969 when Heinz Hugo Loosli and Hans Oeschger of the University of Bern first detected the decay of~(81)Rr(half-life=230 000 yr)in krypton gas extracted from
【出 处】
：
National Science Review
论文部分内容阅读
The dream of radiokrypton dating began in 1969 when Heinz Hugo Loosli and Hans Oeschger of the University of Bern first detected the decay of~(81)Rr(half-life=230 000 yr)in krypton gas extracted from air[1].This isotope is produced in the upper atmosph
其他文献
【本刊讯】5月16日,国家发展改革委在京召开城乡要素高效配置交流座谈会。新型城镇化部际联席会议成员单位有关司局负责人,第一批国家新型城镇化综合试点地区负责人,专家学者和部分新闻媒体代表参加会议。国家发展改革委副主任胡祖才出席会议并作总结发言。会上,重庆、深圳等10个市县和国开金融公司从不同的视角分别介绍了"地票"制度、城镇低效用地再开发
2016年3月22日,由清华大学产业发展与环境治理研究中心(CIDEG)组织的"日本PPP项目和僵尸企业处理经验"专题论坛在清华公管学院报告厅举行。本次论坛邀请了日本亚洲成长研究所所长兼国家战略特区咨询会议议员八田达夫,大阪商业大学综合经营系教授美原融,Anderson毛利·友常律师事务所赤羽贵先生,东京工业大
除竞争对手挖墙角、员工个人原因离职外,人才流失严重的主要原因归根于企业自身人才管理的缺陷。对员工缺乏明确的职业生涯规划。员工关心的发展前途,与企业的未来发展计划是紧密相关的。工作压力大。不少物流企业处于初级阶段,更多地依靠人工处理业务,大量一线工作人员工作时间长、得不到正常的休息。另外,要在激烈的竞争环境下,面对服务同质化和同行抢单
Precision measurement and frequency metrology have pushed many scientific and technological frontiers in the field of atomic,molecular and optical physics.In this article,we provide a brief review on
William Phillips of the National Institute of Standards and Technology(NIST)in Gaithersburg Maryland,shared the 1997 Nobel Prize in physics for his work in developing laser methods for cooling and tra
For several decades,Atomic,Molecular,and Optical Physics has undergone and is still going through a renaissance.Research on cold atoms has played a key role in a profound transformation of this tradit
Any quantum mechanical calculation on electronic structure ought to choose first an appropriate Hamiltonian H and then an Ansatz for parameterizing the wave function Ψ,from which the desired energy/pr
Ultracold gases are remarkably versatile and controllable systems with untapped potential to emulate a variety of quantum phenomena[1].Atoms are,however,electrically neutral and therefore it is highly
On 8 March 2012,Yifang Wang co-spokesperson of the Daya Bay Experiment and Director of Institute of High Energy Physics,Chinese Academy of Sciences,announced the discovery of a new type of neutrino os
The year 2015 marks the 20th anniversary of the achievement of Bose-Einstein condensation(BEC)in atomic vapors.Atomic BEC,realized by Eric Cornell,Carl Wieman and Wolfgang Ketterle in1995,commenced an