Meaning: The self-correlation function and power spectrum density Function of a power-typed signal compose a FT pair.

上式表明：功率型信号的自相关函数与其功率谱密度函数构成傅立叶变换对。

The node-delay's Probability Density Function (PDF) is treated as the node-state.

本文以结点状态的概率密度函数作为参数来描述节点状态。

The binned kernel density estimators were exploited to estimate the probability density function of background intensity in training sequence.

该模型采用分箱核密度估计算法从训练图像序列中得到背景的密度函数。

Generally use an upper-case P(·) to denote a probability mass function and a lower-case p(·)to denote a probability density function.

通常用大写P（·）的表示概率分布函数，小写的p（·）表示概率密度函数。

Besides, the cycles required in ISS and the mean of the density function are suggested.

对重要抽样模拟次数以及密度函数均值的选用，也提出了建议。

The matrix of power spectral density function of fluctuating wind load is established first.

首先建立了脉动风荷载的功率谱密度函数矩阵.

The general expression of probability density function of the total cost elasticity is obtained.

给出了总费用弹性概率密度函数的一般表达式.

The reconstruction of spectral density function shows that low order approximation is very efficient.

其特征谱函数随阶数的增加而迅速衰减，对谱密度函数进行低阶近似也非常有效。

For continuous random variables the area under the probability density function corresponds to probability.

连续随机变量下的面积概率密度函数对应的概率.

For continuous random variables the area under the probability density function corresponds to probability …

连续随机变量下的面积概率密度函数对应的概率。