选择层 meaning in English

selected zone
selective zone

This paper utilizes the maximum likelihood to estimate the parameters of the choice model
利用最大似然法，对模型的上下选择层的参数进行估计。
The objective of this study is to develop a novel technique for preparing asymmetric mosaic membrane by introducing both the negative charged and the positive charged groups into the selective layer of interfacial polymerization ( ip )
为此，本文将重点研究通过界面聚合方法，在超滤膜支撑体上复合很薄的选择层，并使其具有荷电镶嵌膜的结构和特征。