first-order approximation

基本解释

The dichroism kinetic curve of fulgide film was theoretical calculated according to first-order approximation formulae.
用一阶近似理论计算了俘精酸酐样品二向色性随曝光量变化曲线。
Under the first-order approximation of Taylor expansion, the analytic expression for the defect mode frequency is derived, from which the coupling factor is deduced.
利用泰勒展式的一级近似，得到了缺陷模频率的解析表达式，进而得到紧束缚理论中的耦合因子。
Based on principal state of polarization theory and first-order approximation, an analytical expression of signal degree of polarization(DOP) depending on polarization-mode dispersion(PMD) was given.
依据主偏振态理论和一阶偏振模色散（PMD）近似，给出了信号偏振度（DOP）与PMD的解析关系式。