According to the NAH theory and propagating characteristics along different directions, sound field separation technique can be established in the wave-number domain.
从近场声全息原理出发，利用声波沿不同方向传播的特点，针对平面、柱面和球面全息测量建立了波数域内的声场分离公式。
Based on the theory of electromagnetic field, the electrically distributed parameters of pipelines in frequency domain are emphatically analyzed, and its relative model is established in this paper.
本文借用电磁场中的已有理论，着重分析了管线在频率域中的电性分布参数。
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