The full width of transmission function at half maximum is broadened and the visibility is reduced because of the instrumental linewidth and the periodicity of transmission function.

由于仪器函数的自身线宽及其周期性的加宽作用结果，导致透射函数的半峰值线宽受到加宽，可见度下降。

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First we employ EMD method to decompose the crude oil prices in NYMEX, and obtain a series of intrinsic mode function (IMF), which are stationary and of strong periodicity, and a trend term.

首先利用EMD方法对NYMEX市场的原油期货价格进行分解，得到一系列平稳且具有较强周期性的本征模函数(IMF)和一个趋势项。

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