Calculating the demand flexibility of the industry, the result shows that there is great demand of railway transportation industry, there is possibility that the industry has scale economy.
利用替代计算的方法计算铁路需求弹性，证明铁路运输产业存在着巨大的市场需求，该产业存在规模经济的可能性。
The calculating example shows that a stable stress intensity factor can be obtained by selecting a proper calculating boundary and changing the geometric scale of the region.
计算实践表明：选择适当的计算边界，用改变计算区域几何比例的方法可以求得稳定的应力强度因子。
It is showed that a new viewpoint of theory of large scale systems is suited for optimal calculating design of cascades.
论证了利用大系统理论建立适合平面叶栅气动设计计算优化方法的可行性，旨在为气动设计提供一种新的优化方法。
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