approximate expansion meaning in Chinese

近似展开式

In connection with the researches carried out in our laboratory , the description is concentrated on the high accurate four - component relativistic density functional methods with relativistic effects taken into account strictly , and the two - component or scalar relativistic density functional methods with relativistic effects considered approximately , involving the zero - order regular approximation ( zora ) method and its improved variants , the singularity excluded approximate expansion ( seax ) method , and the jointed two component - scalar relativistic ( or non - relativistic ) approach applicable to the calculations of large systems locally containing heavy elements
结合本实验室的研究工作，重点介绍严格处理相对论效应的四分量相对论密度泛函计算方法和近似处理相对论效应的两分量和标量相对论密度泛函计算方法，包括零级规则展开近似( zora )方法及其改进和排除奇点的近似展开( seax )方法，以及适合处理局部包含重元素大体系的接合两分量标量相对论（或非相对论）计算方法。