Now, yet another Italian manufacturer has begun selling quite an interesting new FFF based 3d printer.
现在，又一个意大利制造商已经开始销售相当有趣的新的基于FFF 3d打印机。
2
And after the intraday periodicity factors are filtered through FFF regression, the high frequency absolute return of fund index doesn't have obvious periodicity any longer.
通过FFF方法，将该周期因子进行滤波处理以后，基金指数高频绝对收益不再具有明显周期性。
3
The paper proposes application of Wavelet Neural Network in high-frequency time series calendar effects' study. At last, the paper proves that WNN is better than classical FFF regression.