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.
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