Ni：指i区的平均人口密度，为了简化分析，地球表面被按照网格分成多个i区，每个区的分布假定是统一的。
Ni : Average population density in area i. To simplify the analysis, Earth’s surface is divided into a grid of squares i, and the distribution is assumed to be uniform in each.
应用非参数核密度估计方法，可以由样本直径结构很好地描述总体直径结构，而无需假定总体的直径分布。
The population diameter structure can well be described by using nonparametric kernel method based on the sample data without assuming the population diameter distribution.
假定介质为块状，且块中纵，横波速度及密度、品质因数横向分段线性连续变化。
The assumption is made that P-wave velocity, S-wave velocity, density and Q factor show lateral piecewise linear continuous variations in block media.
在此模型中，把非均匀等离子体球分成若干个同心等离子体球壳，并且假定每一个同心壳层内等离子体密度均匀分布。
In this model, the nonuniform sphere is modeled by Numbers of concentric spherical shells, and each has a fixed electron density.
在绝热密度扰动(假定初始扰动是绝热的)的方案中，有两种观念特别值得注意：1，宇宙密度波的观念。
Two ideas are worth notice in the adiabatic scenario (assumed that the initial perturbations are adiabatic) : 1. The idea of the cosmic density wave.
密度泛函的基础是一个假定：假定一个多粒子体系的任何性质都是基态电子密度的函数。
The basic idea of DFT is an ansatz, which assumes that any properties of many-body system can be determined by the ground state density.
但是这种方法也有不足之处，就在于它对模型有一些弱的假定点估计依赖于误差因子与模型参数的假定，密度估计依赖于误差因子特征函数的假定。
The disadvantages were that this method was based on assumptions on the model: point estimation based on parametric assumption and some properties of error components.
随机缺陷分析方法中假定结构每个节点的位置偏差符合二倍均方差范围内的正态概率密度函数是可以接受的。
The results indicate that the initial deviations of the joint positions match normal probability density function limited in the range of double mean variance.
随机缺陷分析方法中假定结构每个节点的位置偏差符合二倍均方差范围内的正态概率密度函数是可以接受的。
The results indicate that the initial deviations of the joint positions match normal probability density function limited in the range of double mean variance.
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