实验发现，棒在颗粒物质中运动时滑动摩擦力具有准周期振荡性质。
It is found that sliding friction between continuous medium and granular materials has a novel speciality of quasi-periods oscillatory.
实验发现，棒在颗粒物质中运动时滑动摩擦力具有准周期振荡性质。
On the nonlinear oscillation of internal sliding friction in particulate matter;
用一个有外强迫的、简单的动力系统研究气候系统中的准两年振荡（平均周期长度比两年稍长或稍短的准周期振荡）。
The QBO (quasi-biennial oscillation) in the climate system, with a mean cycle-length slightly above or below 2 years, is studied in a simple forced dynamical system.
认为云在准三年周期振荡过程中起着重要作用，而在准半年周期振荡中自身反馈过程则是主要的过程。
It is found that clouds play an important role in the feedback process of quasi three-yearly oscillation, and that the self feedback process is important in the quasi half-yearly oscillation.
这种周期振荡现象与赤道平流层的纬向风的准两年周期振荡现象有很好的对应关系。
It is well correspond to zonal wind oscillation on low layer of the stratosphere over Equator.
空间模式在时域上具有一定的振荡周期。其中，前滨模式以4天的准周期变化为主，滩肩模式则有28天的准周期性变化。
These modes have obviously oscillations in temporal domain, in which the foreshore mode has mainly quasi period about 4 days, while the quasi period for the beach berm mode is 2 8 days.
空间模式在时域上具有一定的振荡周期。其中，前滨模式以4天的准周期变化为主，滩肩模式则有28天的准周期性变化。
These modes have obviously oscillations in temporal domain, in which the foreshore mode has mainly quasi period about 4 days, while the quasi period for the beach berm mode is 2 8 days.
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