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.
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。
Analysis of surface stream and energy fields obviously showed that the squall line occurred behind the surface shear line, and before the convergence area of wind.
地面流场和能量场的分析明显反映出了飑线在地面切变线后部，风向、风速辐合区前部。
The paper expounds pollution condition of surface water of JiaMuSi area, and makes assessment and dynamic analysis of main pollutants.
本文阐述了佳木斯地区地表水水质污染情况，并对主要污染物进行了动态分析、评价。
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