Formulae on the basevectors and the coordinate variables derivative going with fluid particle and their application;
因为标量与坐标系无关，故两个矢量的点积称为标量不变量。
2
By using the discrete position base - vectors approximating for the continuous position base - vector, the discrete position presentation is constructed.
用离散的位置基矢近似替代连续位置基矢，建立分立位置表象。
3
Signal sample is analyzed through wavelet packet theory, best base is chose, and the average energy of every sub frequency band is calculated, at last 14 links of characteristic vectors are get.