The exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are available.
窄缝的声阻抗严格公式以及低频近似公式都存在。
The amount of calculation is greatly decreased over high frequency zones by using high-frequency approximation method.
采用相对相位叠加的高频近似方法，处理天线阵高频区散射的计算，大幅减少了计算量。
A new symplectic geometrical high frequency approximation method for solving the propagation of electromagnetic wave in an inhomogeneous medium is presented.
提出了一种基于辛几何的高频近似的新方法，并用此方法求解了电磁波在一非均匀媒质中的传播问题。
A hybrid technique for calculating the scattering of two-dimensional large bodies with slots is developed by combining high-frequency approximation method with low-frequency numerical method.
本文利用高频近似方法与低频数值方法相结合的混合方法计算二维开槽电大目标的散射。
A hybrid technique for calculating the scattering of two-dimensional large bodies with slots is developed by combining high-frequency approximation method with low-frequency numerical method.
本文利用高频近似方法与低频数值方法相结合的混合方法计算二维开槽电大目标的散射。
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