Objective To study the generalization of the S shaped extinctioncurve and its application in medical and hygienic science.
目的研究探讨S型消亡曲线的推广及其在医药卫生学上的应用。
2
Results it could be seen from the example that the generalized form of the s shaped extinctioncurve and its parameters had the practical significance and the fitted effect was better.
结果经实例验证，S型消亡曲线的广义形式符合实际意义、参数意义明显且拟合效果较好。
3
First, a working curve must be made according to the colour gradation data and then the density of the substances is found out with the help of the extinction value of the water samples on it.