电子发烧友App

硬声App

0
  • 聊天消息
  • 系统消息
  • 评论与回复
登录后你可以
  • 下载海量资料
  • 学习在线课程
  • 观看技术视频
  • 写文章/发帖/加入社区
会员中心
创作中心

完善资料让更多小伙伴认识你,还能领取20积分哦,立即完善>

3天内不再提示
电子发烧友网>电子资料下载>IC datasheet pdf>7642 pdf

7642 pdf

2008-07-01 | rar | 666 | 次下载 | 5积分

资料介绍

Introduction: Since the introduction of high
precision negative thermal ionization mass
spectrometry for Re and Os isotopic measurements
in 1991[1,2,3], two problems persisted in obtaining
an absolute chronology with the Re-Os system. The
first problem centers on the precision and accuracy
of Os spike calibration. The main difficulties arise
from the (1) absence of stoichiometric Os metal or
salts of high purity to serve as primary standards and
(2) the lack of isotopic equilibrium between Os of
different oxidation states and of different chemical
forms in the spike and standard. Re-Os  isochrons
have been determined to per-mil range precision in
both slope and initial [4,5,6]. But because the
accuracy of Os spike is currently limited to 0.5 to
1.6%, the isochron may be horizontally off by
~1.6%. This will have a significant effect of the
calculated initial Os isotopic composition. The
second problem is that the half-life of
187
Re is only
known to ~3% based on the direct measurement [7].
Any age calculated from the slope of an isochron
has an uncertainty of ~3%. The uncertainty of the
187
Re half-life ultimately depends on the accuracy of
the Os spike calibration. It is thus clear that this is
an area that needs further improvement, so that the
Re-Os chronometer as an absolute dating tool can be
applied to its fullest potential.
下载该资料的人也在下载 下载该资料的人还在阅读
更多 >

评论

查看更多

下载排行

本周

  1. 1华为硬件工程师手册目前最全版本
  2. 1.02 MB   |  7次下载  |  2 积分
  3. 2STM32单片机无人机设计
  4. 8.81 MB   |  2次下载  |  免费
  5. 3TTL通往RS232神奇之黑盒(一)(可下载)
  6. 515.72 KB  |  2次下载  |  免费
  7. 4TP4336 线性充电,同步升压1A 同步移动电源解决方案
  8. 764.17 KB  |  1次下载  |  免费
  9. 5直流有刷电机驱动PCB设计注意事项讲解(可下载)
  10. 1.01 MB  |  1次下载  |  免费
  11. 6晶体谐振器的工作原理
  12. 736.44 KB  |  1次下载  |  免费
  13. 7LLC的死区时间对DS波形的影响(可下载)
  14. 675.86 KB  |  1次下载  |  免费
  15. 8电子产品设计与调试
  16. 14.66 MB   |  次下载  |  8 积分

本月

  1. 1STM32CubeMX用于STM32配置和初始化C代码生成
  2. 21.90 MB   |  631次下载  |  免费
  3. 2STM32开发板教程之STM32开发指南免费下载
  4. 24.88 MB   |  176次下载  |  3 积分
  5. 3EN60335-1安规标准 中文版本
  6. 1.86 MB   |  53次下载  |  1 积分
  7. 4OAH0428最新规格书(中文)
  8. 2.52 MB   |  28次下载  |  10 积分
  9. 5UHV系列雷电冲击电压发生器试验装置详细说明使用
  10. 1.07 MB   |  17次下载  |  免费
  11. 6介绍一些常用的电子元器件
  12. 3.20 MB   |  8次下载  |  免费
  13. 7麻将机升降电路
  14. 0.12 MB   |  7次下载  |  1 积分
  15. 8华为硬件工程师手册目前最全版本
  16. 1.02 MB   |  7次下载  |  2 积分

总榜

  1. 1matlab软件下载入口
  2. 未知  |  935124次下载  |  10 积分
  3. 2开源硬件-PMP21529.1-4 开关降压/升压双向直流/直流转换器 PCB layout 设计
  4. 1.48MB  |  420063次下载  |  10 积分
  5. 3Altium DXP2002下载入口
  6. 未知  |  233088次下载  |  10 积分
  7. 4电路仿真软件multisim 10.0免费下载
  8. 340992  |  191371次下载  |  10 积分
  9. 5十天学会AVR单片机与C语言视频教程 下载
  10. 158M  |  183336次下载  |  10 积分
  11. 6labview8.5下载
  12. 未知  |  81583次下载  |  10 积分
  13. 7Keil工具MDK-Arm免费下载
  14. 0.02 MB  |  73814次下载  |  10 积分
  15. 8LabVIEW 8.6下载
  16. 未知  |  65988次下载  |  10 积分