在单轴循环加载实验中不断改变平均应力和正弦波应力振幅的实验条件下，研究饱和砂岩和大理岩的动态响应。
By shifting the mean stress and the sine wave stress amplitude, uniaxial cyclic experiments were performed to study the dynamic response of fluid-saturated sandstones and marbles.
简要介绍了单自由度非线性保守系统作大振幅振动时周期的计算方法，并给出了几个常见典型振动问题的周期公式。
A calculation for period of a single freedom nonlinear conservative system vibrating in a large amplitude is performed, and the period formulae of some typical vibration problems are presented.
同时，单电子三极管I-V曲线的振幅随着隧道结电容的增大而减小，但I-V曲线的周期保持不变。
If the tunnel junction capacitance becomes larger, the amplitude of the I-V curve of single-electron transistor becomes smaller, but the period is unchanged.
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