近似展开 meaning in English
approximate expansion
Examples
- The standard parabolic equation method was obtained by the decompocition of the scalar wave equation and the expansion of the pseudo - differential operator
通过对传统波动方程的分解和伪微分算子的近似展开，获得了标准抛物线方程。 - Applying the above - mentioned method , the author developed an approximate developing - mapping system based on catia v5 using vb , realized the development computing of panel surface and auto - drawing of developed shape in catia , dealt with the problem : getting mesh data from analysis & simulation module of catia , picking up structure information data in iges , showing 2d developed model in catia
应用上述几何展开算法，作者基于windowsnt 2000 xp系统和catiav5平台用visualbasic开发了一套“不可展曲面近似展开和内部结构信息映射系统”软件，简称demaps系统，实现了飞机壁板类零件的展开计算和展开图形自动绘制。 - 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。 - Author , secondly , starts from the approximate expandness of square root operator , perform mathematical calculations for finite difference operator in frequency - space domain , fourier finite difference operator in mixing domain ( frequency - space and frequency - wavenumber domain ) and general screen operator in mixing domain , compare and discuss their precision of their wavefield , adaptability for lateral velocity variations , computation efficiency and stability . thirdly , author , applies the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) in frequency - wavenumber domain , to the prestack and poststack forward modeling and depth migration
第二，从平方根算子的近似展开出发对频率?空间域的有限差分算子、混合域(频率?空间域；频率?波数域)的fourier有限差分算子、混合域的广义屏算子进行了推导并对其波场描述精度、对横向变速的适应性、计算效率和稳定性进行了比较与评述。