In this paper, for solving the parameter problem of two dimensional wave equation, the method of Finite Element and the Pulse Spectrum Technique, i. e. the iterative process are used.
本文针对求解二维波动方程的参数问题，利用有限元方法把波动方程反问题转化为有限元反问题，并利用脉冲谱技术，即一个迭代过程进行求解。
We have investigated the guide modes in two kinds of two_dimensional photonic crystal heterostructures by using the plane wave expansion method combined with the supercell technique.
利用平面波展开方法与超原胞方法研究了两种不同晶格的光子晶体异质结的界面态。
Based on DDS technique, the signal generator can create two signals, i. e. the sinewave and the square wave signals, and its amplitude, frequency and phase can be continuously adjusted.
采用直接数字合成（DDS）技术构建双路正弦波及同步方波发生器，实现幅值、频率、相位等连续调节；
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