To prediction of city spatial expansion, this part brings forward predicting method of point sources radiation diffusion based on the thought of regional diffusion and takes Jinan as an example.
对城市空间的扩展，采用区域扩散的思想，提出一种城市空间扩展的放射线预测方法，并以济南为例进行了研究。
Our proof of the convergence is based on an asymptotic diffusion expansion and requires error estimates on a matched boundary layer approximation to the solution of the discrete-ordinate method.
其收敛性的证明是依据其渐近扩散展开式，在边界层上得到的误差估计逼近其离散纵标方法的解。
Bass Bass diffusion model (Bass, the diffusion model) and its expansion theory, is often used as a market analysis tools, new products, new technology demand forecast.
Bass提出的巴斯扩散模型(Bass Diffusion Model)及其扩展理论，常被用作市场分析工具，对新产品、新技术需求进行预测。
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