The output characteristics of the ASE amplifier are experimentally studied. The ASE far-field patterns for the lowest waveguide mode are obtained in agreement with theroy.

实验获得放大自发辐射的远场光斑图样与理论计算比较基本一致，并对放大自发辐射输出特性进行研究。

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B ase on the study of lab experiment, the characteristics of nitrogen and phosphorus transport and transformation in soil was studied under sprinkler irrigation and flood irrigation.

本文以室内土柱实验研究为基础，研究了漫灌、喷灌入渗条件下，土壤氮类、磷类化合物迁移转化的特征。

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