探讨了小孔泄漏气体噪声频谱中某一频段声压级与雷诺数之间的函数关系。

The function relationship between acoustic intensity of eyelet leak noise frequency section and re was discussed.

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给出了基本改进型和两级耦合后的信号产生电路仿真结果，并对这种混沌雷达信号源和单级考必兹混沌电路的输出信号频谱进行了比较。

The results of circuit simulation are given, and we compare the spectrum of output signal of the coupled circuit with that of modified Colpitts circuit.

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置一位相光栅于相干光学处理系统频谱平面，利用其零级与一级衍射光的相干迭加实现图象相减。

With a phase grating located at Fourier frequency plane, optical image subtraction is obtained as a result of the coherent superposition of the zeroth and the first order of the diffracted light.

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