本文利用空间价格梯度场模型分析了森林认证对关税壁垒的替代效应，并在最后提出了相关建议。
This paper analyzes the substituting effect of forest certification against tariff barriers using a space-price gradient model, and gives Suggestions.
文章对含i型裂纹的正交各向异性功能梯度材料板沿其板厚的弹性常数表达式呈指数函数变化时的应力-应变场进行分析。
In this article, the fracture analysis on mode I crack of orthotropic functionally gradient materials is studied, under which the elastic constants changed exponentially along thickness of the plate.
以某小区为例，对其风环境进行了数值模拟计算与分析，引入梯度风的概念，指出了小区内建筑分布对小区风场的影响。
The wind environment of a district is calculated and analyzed with numerical simulation, the concept of gradient wind is proposed to explain that buildings' distribution affect the wind field.
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