Element analysis apparatus and xps were taken to analyse the chemical components of the acquired products , the chemical elements of the systems were almost in according to which theoretical structural formula 利用元素分析仪和xps对合成产物的化学成分进行了分析,各体系的化学元素基本与理论化学式相符。
According to the kernel estimating theory of nonlinear semiparametric models under the least - square principle , the structural formulae of the estimation of parametric and nonparametric components and the direct formulas of kernel estimation considering the second order items were given 摘要基于非线性半参数模型最小二乘核估计,给出了其参数分量和非参数分量估计的构造式,导出了参数分量和非参数分量顾及二次项直接解法的计算公式。
The structural formula of a chemical compound is a graphic representation of the molecular structure, showing how the atoms are arranged. The chemical bonding within the molecule is also shown, either explicitly or implicitly.