自发变化
The calculated results show that the spontaneous emission rate displays multi-periodical oscillations with the variation of the thickness of the slab, when the ratio of distances from the emission atom to the upper and lower interfaces is fixed.
计算结果表明:随着介质板厚度的增加,当保持发光原子与上下界面的距离之比不变时,原子自发辐射速率呈现衰减的多周期振荡现象。
Objective To study the variation of peripheral blood NK Sub-class ratio in recurrent spontaneous abortion.
目的研究自然杀伤(NK)细胞亚群比例变化与复发性自然流产(RSA)的关系.
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