The paper first introduces the basic knowledge of power system harmonics, and points out the importance of studying harmonics.

本文首先介绍了电力系统谐波的基本知识，并指出了电力系统谐波研究的艰巨任务和重大意义。

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In this paper, depending on the real problems of the power system harmonics, first describing the classification, topological structure, the advantages and applications of active power filter.

本文从电力系统谐波研究的实际问题出发，首先阐述了有源电力滤波器的分类及拓扑结构以及优势和应用前景。

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The harmonics of the output waveforms of AMR magnetic grating ruler head were analyzed and the half harmonics' phenomena were observed for the first time.

对采集到的AMR磁栅尺磁头输出波形进行了付里叶谐波分析，发现了波形中的半次谐波现象。

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At first she attributed this to the range of high harmonics used by Mozart, but her later research, which manipulated the frequency levels of various compositions, showed that frequencies alone were not responsible for this physiological response.

ECONOMIST: Music as healing