This paper proposed a secret watermarking schema in frequency domain based on frequency theory.

借用扩频技术的基本思想,提出了一种基于频域的秘密水印方案.

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The extinguish of arc of single - fault is analyzed with frequency theory and fundamental frequency theory.

本文分析了小电流接地系统弧光接地过电压的基本原理及高频熄弧理论和工频熄弧理论.

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