random-walk diffusion

This process of separation and spreading out of particles by random walks is known as diffusion.

粒子通过随机运动离散开去的这种过程就叫打散.

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The random time horizon mean variance models corresponding to three market situations: discrete time, continuous time and jump diffusion process are formulated respectively and the relevant efficient frontier is defined.

建立了离散时间、连续时间与跳跃扩散过程三种市场状态下随机时域的均值-方差模型，定义了相应的有效前沿。

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The method is based on the kinetic theory of gas molecules, which assumes that the gas molecules do irregular thermal motion, and obtains the whole motion of the diffusion of gas by simulating a large number of random motion of molecules.

由于该方法借鉴气体分子动理论，假定烟雾粒子做一定规则的扩散运动，通过模拟大量粒子的运动来获得扩散气体的整体运动规律，因此具有模型简单直观，过程真实可靠的特性。

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Molecular diffusion occurs in a gas as a result of the random motion of the molecules.

气体中的分子扩散是由分子的不规则运动产生的.

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Random walks, brownian motion, diffusion.

随机行走, 布朗运动, 扩散.

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