同位素

Even Francium's most stable isotope, Francium-223 only has a half-life of 22 minutes.

钫的最稳定的同位素，钫-223也只有22分钟的半衰期。

In this paper, much energy has been placed on phosphate concretion re search which host in black shales of Dou Shantuo Fm. and Nu Titang Fm、 Research contents include mineralogy, petrology and geochemistry character istics of phosphate concretions. Element distributive characteristics are ana lysed using Synchrotron Radiation techniques. Additionally, sulfur isotopes of francolite and their significance are discussed in this paper. The results are as following

本文开展了晚震旦世陡山沱组以及早寒武世牛蹄塘组两套黑色页岩中磷结核的研究，对产于这两套黑色页岩中磷结核的矿物组成、地球化学等方面开展了研究，首次运用了同步幅射X-荧光探针对结核内元素的分析特征进行了分析，同时还测定了磷的硫同位素并讨论了其意义，所得出的结果简述如下

In the early 1950s American scientists produced the hydrogen bomb by inducing fusion reactions in a mixture of the hydrogen isotopes deuterium and tritium, forming a heavier helium nucleus.

1950年代，美国科学家在氢的同位素氘和氚的混合物中引导聚变反应生成较重的氦原子核，从而制造出了氢弹。

In the early 1950s American scientists produced the hydrogen bomb by inducing fusion reactions in a mixture of the hydrogen isotope s deuterium and tritium, forming a heavier helium nucleus.

1950年代，美国科学家在氢的同位素氘和氚的混合物中引导聚变反应生成较重的氦原子核，从而制造出了氢弹。

In the early 1950s American scientist s produced the hydrogen bomb by inducing fusion reactions in a mixture of the hydrogen isotopes deuterium and tritium, forming a heavier helium nucleus.

1950年代，美国科学家在氢的同位素氘和氚的混合物中引导聚变反应生成较重的氦原子核，从而制造出了氢弹。

Under the theory of regional metallogenic system, this paper, focusing on Gaize district in Tibet, conducted carefully research in geological structure, magma activity, geophysical anomaly, geochemical anomaly, gold-bearing geological bodies and gold occurrence state, association of gold with other related elements, characteristics of typical deposits, metallogenic age, metallogenic process, post-ore-forming destruction of deposits in Gaize district based on methods of geology, petrology, economic geology, genetic mineralogy, isotopic chronology, geophysical and geochemical prospecting, and remote sensing.

本论文以藏北改则地区为重点研究区，以区域成矿系统理论为指导，采用地质学、岩石学、矿床学、成因矿物学、同位素年代学以及物、化、遥相结合的方法，对改则地区的地质构造、岩浆活动、物化遥异常、各地质体的含金性及金的赋存状态、金与相关元素的组合特征、典型矿床特征、成矿时代、成矿过程及矿床形成后的破坏作用等进行了较详细的研究。

The research on micro-fauna and carbon, oxygen,strontium isotopes and magnetic susceptibility reveals that the signals of globalPaleocene/Eocene boundary event are well recorded in the Gamba region.

本文对剖面各个层位生物群，界线附近的碳、氧、锶稳定同位素以及磁化率进行了研究，研究成果显示，全球界线事件在西藏南部岗巴地区具有明显的影响。

The isotope americium-241 has been prepared in kilogram quantities and is used in a variety of measuring applications that utilize its gamma radiation.

从鋂－241同位素已制备出以公斤计的鋂，并在一些仪表中已利用了鋂的γ射线。

The main results were as follows: The stable and high efficient AFLP analysis system of peach genom...

主要研究结果如下：建立了桃的稳定可靠的AFLP分析体系：高质量的基因组DNA是AFLP分析体系的关键步骤；E+0/M+0或E+0/M+C引物组合对预扩增条带数的影响不显著；选择性扩增引物组合E+2/M+3和E+3/M+3都可用于基因组的研究，但是前者的多态性高于后者；银染显色法具有成本低、检测时间短、避免同位素污染等优点，是一种安全、快速、有效的方法。

"This was an unexpected find," says isotope geochemist and co-author Christopher Ballentine of the University of Manchester in the United Kingdom.

"这是个意外的发现，"英国曼彻斯特大学同位素地球化学家、研究论文的合作者克里斯托弗·巴伦坦说。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。