The simultaneous determination of multi-element in soil by ICP-AES with a CCD and the method for correction of matrix interference effect are studied and compared.
文章研究了用电荷-耦合装置电感耦合等离子体发射光谱同时测定土壤中多种元素，并对校正基体干扰效应的方法进行了研究和比较。
In the finite element simulation of foundation pit excavation, the stiffness matrix of soil, the external loads and the excavation load are changed with the increasing depth.
在对基坑开挖的有限元模拟中，土体刚度矩阵、外荷载和开挖荷载等都随开挖深度的变化而变化。
The soil reaction matrix is added to beam element stiffness matrix, and modified beam element stiffness matrix is formed.
将土反力矩阵与梁单元刚度矩阵迭加，形成修正的梁单元刚度矩阵；
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