...3 光学常数 前面提到过复数折射指数( ik n m − = )的概念，其中，折射指数(refractive index) n 和 吸收指数(absorption index) k 又合称为光学常数。要考虑颗粒的辐射特性，就要先讨论 各类颗粒的光学常数。
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由所得到的透射光谱推导出吸收指数k。
Through transmission spectrum mensurated during the experiment, the absorption - coefficient K is obtained.
当地层水含盐量较高时，水的体积光电吸收指数与油(气)的体积光电吸收指数相差较大。
When salinity of formation water is rather high, the volumetric photoelectric absorption index of water and that of oil (gas) are quite different.
高纤维碳水化合物血糖指数相对较低，但它们与脂肪或蛋白质结合可以更有效地减缓吸收。
High fiber carbohydrates are relatively low glycemic but combining them with fat or protein can slow absorption even more.
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