These confirmed that PF possessed stronger activity and was the effective component of propolis in immunoenhancement. 证明PF具有较强的增强免疫活性,是蜂胶中增强免疫作用的有效成分。
A regenerated cellulose fiber containing active component of persimmon leaves was prepared via wet spinning by u-sing dimethylsulfoxide ( DMSO ) / paraformaldehyde ( PF ) as a solvent and adding active component of persimmon leaves. 以二甲基亚砜(DMSO)/多聚甲醛(PF)为溶剂,添加柿叶活性成分,应用湿法纺丝技术,制得含柿叶提取物的再生纤维素纤维。
Therefore, the PF is low and the input power pulsation is large. However, if the 3rd harmonic is in phase with the fundamental component, the input power pulsation can be reduced, leading to a lower output voltage ripple. 但是,如果三次谐波的初始相位与基波相同,则可以减小输入功率脉动,从而减小输出电压脉动。
Firstly, we adopt the wavelet technique to decompose the vibration signal of rotor systems into several wavelet components, then each of wavelet component is decomposed by the LMD method and a number of PF components can be acquired from which the initial feature vector matrix is formed. 该方法先用小波包分解法将转子振动信号分解成若干个小波包分量,进一步对各小波包分量进行LMD分解,得到一系列PF分量,形成初始特征向量矩阵。