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1·By imitating of the design characters of the high frequency circuit, the origin and the classification of the noise interferences of the low field NMR circuit system are analyzed.

此外本文参照高频电路的设计特点，分析了低场磁共振信号放大电路的噪声干扰来源，给出了一些减少噪声干扰的具体措施。

2·Mainly introducing the feature of the noise, the origin of the noise, model of the noise, Median filtering and equilibrium of the gray.

主要介绍了噪声的特征、噪声的来源、噪声的模型、中值滤波、拉普拉斯锐化、灰度的均衡等。

3·As the radial vibration of stator is the origin of the acoustic noise of SRMs, model analysis of stator vibration is the effective way to the research for low acoustic noise.

由于定子的径向振动是开关磁阻电机噪声的主要根源，因此定子振动系统的模态分析是降噪研究的有效手段。

4·Chapter two talks about the currently situation and the origin of noise pollution come from in Macau.

第二章谈及澳门噪音污染的现状况与原因。

5·Thus, it can come to the important conclusion in this essay that noise trading is the origin of liquidity risk and liquidity premium.

从而得出本文的重要结论，噪音交易是流动性风险和流动性溢价产生的原因。