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1)  DBH distribution
直径分布规律
1.
The DBH distribution of Ecualyptus grandis plantations was initiated with the functions of Weibull,reverse Weibull and logistic.
运用Weibull分布、反 Weibull分布、Logistic方程三种模型拟合巨桉短周期工业原料人工林林分直径分布规律,结果表明Logistic方程拟合巨桉人工林的直径分布效果好,并在此基础上分3个立地等级建立了直径分布收获模型,经检验,精度达到要求。
2)  regularity of diameter structure of stands
林分直径分布规律
3)  particle size d istribution regularity
粒径分布规律
4)  vertical distribution law
垂直分布规律
5)  diameter distribution
直径分布
1.
The nonparametric kernel density theory and methods are introduced to model the diameter distribution of broadleaved Pinus koraiensis in Liaoning eastern mountains in contrast with the normal distribution and Weibull distribution.
结果表明,核密度估计方法在模拟直径分布方面明显优于后者。
2.
stand for water resource conservation,the growth process and diameter distribution characteristic of Larix Principis-rupprechtii Plantation in 10 years old were studied using stem analysis method of sample tree,which had two density structures(one was 2 600 per hm2,the other was 3 500 per hm2) in water conservation forest region of Wutai Mountain in Shanxi Province.
hm-2)的人工林生长过程和直径分布进行研究。
6)  distribution law
分布规律
1.
Abutment pressure distribution law of fully-mechanized face in soft,thick coal seam;
极软厚煤层综采面超前支撑压力的分布规律
2.
Failure distribution law of a machining center and its study;
加工中心故障分布规律及其研究方法
3.
Structure genetic mechanism and distribution law of collapse pillars in one coal mine;
某矿区构造成因与陷落柱分布规律的探讨
补充资料:当量比表面直径、表面积体积平均直径
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性质:又称当量比表面直径、表面积体积平均直径。是颗粒群表面积分布的平均直径。其意义为与颗粒群的粒形相同,总体积相同、总表面积相同,且粒度均匀的一个假想颗粒群的粒度。亦即指与该颗粒群的粒形相同,比表面积相同的一个颗粒的粒度。 

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