选择系数（selective coefficient）是在选择条件下，某一基因型在群体中不利于生 存的程度，或选择作用下降低的适合度，也就是指被淘汰的百分率。用s 表示，s=1-ω。
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selective coefficient scan 选择性系数扫描
selective scattering coefficient 选择性散射系数
selective absorption coefficient 选择吸收系数
atomic selective absorption coefficient [天] 原子选择吸收系数
selective permeability coefficient 选择透过系数
Selective lignin degradation coefficient 木质素降解选择性系数
Peak current is decreased with the increase scan times. Potential response of chloride doped polyaniline film to anion is reported and selective coefficient of some anion is measured.
报道了氯离子掺杂的聚苯胺膜对一些阴离子均有电位响应，测定了一些阴离子的选择性系数。
The article contains the derivations of the formula of separate coefficient, the conditions of the selective optical excitation and the excited rate for isotope separation as an actual application.
作为实际应用，本文导出了分离同位素时分离系数的计算公式和用短脉冲的选择性激发同位素必须满足的条件以及激发速率的计算方法。
But under sea ice, the attenuation coefficient of PAR is little bit different, as the spectrum of the light has been changed by selective absorption through the sea ice.
在海冰覆盖的条件下，PAR的观测结果与无冰海水的PAR有明显差别。由于海冰选择性的吸收，穿透海冰进入海洋的PAR组分已经不同，海水对PAR的衰减系数也会相应变化。
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