To study the change of particle size distribution, a general dynamic equation is established based on the moment method and the assumption of a reasonable log-normal size distribution.
通过对颗粒的分布作出一个合理的对数正态分布假设，运用矩方法求解颗粒的通用动力学方程，来研究颗粒的尺寸分布情况。
When we study stock market, we usually think that the model of stock price obeys Brownian movement, which log-return characterize normal distribution.
我们研究股票市场价格时，通常认为股票价格模型服从布朗运动，即对数收益率是正态分布的。
The test results show that the predicting fatigue life under variable amplitude loading follow the log normal distribution and agree well with simulation test results.
结果表明，变幅载荷下疲劳寿命的预测结果和模拟结果均服从对数正态分布，且两者符合很好。
In suppressive field, nematode trapping fungi indicated the feature of Log normal distribution.
捕食线虫真菌在土壤中的垂直分布随土层的加深而减少。
The background value of cobalt in soil of Yunnan province was sampled and analyzed, the results show that the cobalt content in soil is log-normal distribution, the median is 16.
对云南省土壤钴元素背景值进行了采样分析，结果显示：云南土壤钴元素含量呈对数正态分布，中位值16。
But Statistics result of actual market indicate most log-return of stock disobey normal distribution.
然而对实际市场数据的经验统计结果表明，多数股票的对数收益率并不服从正态分布。
After reviewing briefly the history of the theory of maintainability, the authors defined the maintainability as well, and pointed out a method for calculating in terms of log-normal distribution.
本文在简略地回顾维修性理论的历史以后，扼要地说明维修性的定义并指出维修特性为对数正态分布的情况下维修度的计算方法。
The results show that the probability distribution characteristic of the vertical permeability coefficient in fissured rock zone is much close to the log-normal distribution.
结果表明，同正态分布和均匀分布相比，裂隙岩体地区的垂向渗透系数更接近对数正态分布。
There is a wide range of particle sizes which approximate the log normal distribution law.
实验发现 ，颗粒粒度的分布服从对数正态分布规律。
There is a wide range of particle sizes which approximate the log normal distribution law.
实验发现 ，颗粒粒度的分布服从对数正态分布规律。
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