对于三缸低波动往复泵，理论上应使三个活塞在排出行程（吸入行程）中的速度之和为一常数，采用凸轮机构能达到这一目的。
Theoretically the sum of the velocities of the three pistons on the discharge stroke in a low-fluctuation triplex pump should be a constant, and this can be achieved by means of the cam mechanism.
文章使用李-代数方法对波动率弹性为常数（CEV）的时间依赖型期权提供一种定价方法。
This paper provides a method for pricing options in the constant elasticity of variance(CEV) model environment using the Lie-algebraic technique when the model parameters are time-dependent.
传统的期权定价都是假设波动率为固定常数，而这与实际不太相符。
In traditional option pricing method the volatility is assumed as a constant, but this is contradicted to the fact.
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