PN：周期数

“Period Number”常缩写为PN，这种简写形式便于快速记录与日常使用。该术语广泛应用于各类未明确分类的综合领域，其核心含义即指“周期数”，用于表示特定的循环或重复次数。

For example, after period number one, a Jaguar came by and ate everyone on Earth.
例如，在第一期的捷豹前来吃地球上的每一个人。
The influences of coupling ratio by pressure, period number and refractive index of matching liquid were also studied.
研究了压力、周期数(PN)、匹配液折射率等对耦合器耦合率的影响。
Establish linear regression model to the two time series to predict the period number of the extreme points.
对这两组时间序列建立线性回归模型，预测出极值点将会出现的期数。
The finer signal processing will get a wavelet with fewer period number, smaller amplitude of side-lode, more full frequency components, and more harmonious energy relations between different frequency components.
好的信号处理体现在剖面的子波周期数(PN)少且旁瓣幅度小，同时频率丰富、频率成分之间能量关系协调。
The high reflective mirrors for Ni-like Ta soft X-ray laser are periodical multilayers, whose layer thickness is small and the period number is large, which make them extremely difficult to fabricate.
类镍钽软X射线激光用反射镜是周期多层膜，其膜层厚度小、周期数(PN)多，制备难度大，实际反射率远小于设计值。

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