首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。
First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.
当一束聚焦的、调制的激励激光照射固体材料时，表面上除了产生周期性的温度分布，还产生局部的周期性形变。
When a focused, modulated exciting laser beam incidents onto a solid surface, besides generation of periodical temperature distribution, a periodical local surface deformation also occurs.
当两台激光器的抽运受到调制而每台激光器的损失不同时，两台激光器输出的强度会出现周期性运动、混沌同步和失去同步的情况。
When both of the lasers are pump-modulated with different losses, the output intensities of the two lasers show periodic motion, chaotic motion, chaotic synchronization and loss of synchronization.
飞机旋转部件的周期运动会对雷达信号的回波产生一个周期性的调制。
The periodical motion of aircraft rotating structures will cause a periodically modulated radar return signal.
分析了周期性对称调制伪模式的显示周期与平面宽度和调制周期内的调制脉冲数之间的关系。
The display period of periodic pseudo-pattern in a virtual 2-D plane is dependent on the pulse number in a modulation period and the display plane width, which is proved in this paper in detail.
分析了周期性对称调制伪模式的显示周期与平面宽度和调制周期内的调制脉冲数之间的关系。
The display period of periodic pseudo-pattern in a virtual 2-D plane is dependent on the pulse number in a modulation period and the display plane width, which is proved in this paper in detail.
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