在此，作者综述了国内外关于调节日粮阴阳离子差对奶牛影响的研究结果及现状，探讨了DCAD在奶牛不同阶段生产实践中的应用。

This report summarized the study result and current actuality about altering DCAD has effect on dairy cows, and discussed DCAD's application on practice in dairy cows' different period.

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采用基于等离子体物理模型的时域有限差分法对其进行了研究。

It is investigated using finite difference time domain method based on Drude model.

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采用基于等离子体物理模型的时域有限差分方法模拟了金属薄膜近场成像特性；采用薄膜传输矩阵方法计算了金属薄膜对倏逝波分量的放大作用。

The property of the near field subwavelength imaging in a metal thin-film structure is investigated using finite difference time domain method based on Drude model.

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