物理上看，在一个特定的临界行波速下会形成自发的周期性分离再附流，每个波谷的分离区捕获一个稳定的涡环。
Physically, at a special critical wave speed the flow may have a naturally periodical separated-reattached pattern, with each wave trough capturing a stable vortex ring.
目的探讨不同光暗周期对小鼠白细胞数量分类计数与自发运动活动的影响。
Objective To investigate the effect of different light-dark cycles on total and differential counts of leukocyte as well as spontaneous locomotor activity in mice.
本文利用铁电晶体自发极化产生的强大周期性表面势，首次提出新的自由电子激光原理。
A new principle for free electron lasers is proposed for the first time by using very strong surface periodic potential caused by the spontaneous polarization of ferroelectric single crystals.
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