half period

By the analytic technique of HPLC,the half life was 23.

8mg/kg时,所测半衰期为23。

To study the behavior of the half life of ozone under normal temperature,the calculation formula of the half life of ozone in obturation cabin was obtained by revising the indoor chemical exposure model established by Swarlar under naturally attenuating condition.

研究臭氧半衰期规律,对Swarlar等人建立的室内化学暴露模型在臭氧自然衰减情况下进行修正,推导出密闭环境舱内的臭氧半衰期计算公式,研究表明臭氧半衰期与初始含量无关,只与环境舱大小、材料对臭氧的去除速率及自身分解速率有关。

The half life was less than 27 days under the above conditions.

0;该菌株依靠共代谢作用还原PGNB,在培养液和土壤悬液条件下均能加速PC-NB的降解,半衰期均低于27 d。

Effect of pegylation degree on activity and half-life of hirudin;

聚乙二醇不同修饰度对水蛭素活性和半衰期的影响

Half-life measurement of ~(79)Se with projectile X-ray method in AMS;

利用加速器质谱学中的入射离子X射线方法测定~(79)Se的半衰期

Half-life determination of ~(142)La decay;

~(142)La半衰期的测定

The results show that the half-life time of a well tightened cleanroom is less than 5 minutes,and the hourly leak rate is less than 10 percent.

结果表明,一个密封很好的洁净室,500Pa压力的半衰期不足5min,小时泄漏率不到10。

α-amylase has short half-life time and is easy to be inactive.

α-淀粉酶在高温条件下半衰期短,易失活,提高其热稳定性的方法有:添加稳定剂、化学修饰、固定化等。

The half-life of francium is 22 minutes.

钫的半衰期是22分钟。

radioactive half life

放射性物质的半衰期

half-life of recurrent selection process

轮回选择过程的半衰期

Half-lives of the newly synthesized nuclei in~(263)Hs and ~(260)Bhα-decay chains

新核素~(263)Hs,~(260)Bh及其α衰变链上核素的半衰期

The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay.

半衰期放射性样品的原子核经历一半放射性衰变所需要的时间

It is not necessary to wait until half of a sample has decayed in order to measure the halflife.

不必一直等到样品衰变一半之后才测量它的半衰期。

Half-life of radioactive element carbon-14 is 5730 year.

放射性元素碳-14的半衰期为5730年。

The half life of the uncharged pion is 6×??.

中性兀介子的半衰期为6×?得搿?/UK>

It has a half-life of about 41/2 billion years.

它的半衰期大约为45亿年。

A very useful quantity is the half-time for the reaction.

一个很有用的量是反应的半衰期。

Theoretical Evaluation on Expansion Ratio and Half-time of Foamed Asphalt

泡沫沥青膨胀率和半衰期的理论测算

Half-life determination of fission products ~(94)Y and ~(95)Y

裂变产物~(94)Y和~(95)Y半衰期的测定

The measurement of the half-life of ~(151)Sm by liquid scintillation counter

液闪法测定~(151)Sm的半衰期

Measurement of ~(198)Auβ~--Decay Half-Life in Metal Au at Low Temperature

低温金属环境中~(198)Au半衰期的测量

Half-life:A New Way of Research into Virtual Learning Community

“半衰期”:虚拟学习社区研究的新方法

Half-lives are characteristic properties of the various unstable atomic nuclei and the particular way in which they decay. Alpha decay and Beta decay are generally slower processes than gamma decay.

半衰期是各种不稳定原子核的特性,是它们衰变的特殊方式。α衰变和β衰变一般比γ衰变为慢。

An Analysis of the Cited Half-life of Chinese Social-Science Periodicals;

中国人文社会科学期刊被引半衰期分析研究

And the point is, that half-life stays the same forever, even though atoms are decaying all the time.

重点是，半衰期永远是一样的，即使原子一直在衰减。