抽样单元

成套小样园作为典型众数抽样调查单元的方法

Study on The Method Using A Complete Sets of Small Round Plots As the Investigate Unit of Typical Mode Sampling

基本相位结构呈非周期分布的衍射光学结构的表面轮廓由大量的抽样位相单元组成，各个位相单元具有可变的结构尺寸和深度。

The surface profiles of these optical structures are composed of many sampled phase units which have variable structural size and depth .

当二阶抽样的初级单元与次级单元的消耗指标C1／C2＝10时，在各种密度下次级单元的最适抽样量为每样株5～6个枝条；

When the sampling consume index ( C 1 / C 2 ) of the primary unit and secondary unit for two-stage sampling equals 10 , the optimum sampling number of secondary unit is 5 or 6 twigs at each density .

森林资源清查中，多阶抽样并不局限于固定面积的抽样单元。

Multistage sampling in forest inventory is not restricted to fixed-area sampling units .

多数两阶段抽样样本的试件项方差分量大于样木项方差分量，说明株内变异较大，二阶抽样单元数对样本精确度有相当影响。

Analysis of the data on sampling in two stages demonstrated that the component of variance in specimen was larger than that in sample tree for most samples of both species , which revealed that the size of second stage sampling had considerable effect on the accuracy of sample .