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。
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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