half-life是什么意思

用法例句

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。