查询词典 continuous approximation

In this chapter,we mainly give some basic theory of absorption, dispersion,dipole approximation and the equation of density matrix elements.

主要介绍激光光谱学的吸收和色散等基本概念以及常用的理论如偶极近似、密度矩阵方程等。

Moreover,there are relatively few researches on derivative of higher order approximation.

由于在讨论中的采样取值是随机的，使得该方法具有较大的实用性。

Fourier transform method can be directly derived from symbol function＇s separable approximation.

Fourier变换方法则直接用象征函数的可分表示求出。

Exact formulae for bit error probabilities of the considered system are derived, and a set of numerical results both for the exact formulae and Gaussian approximation are presented.

分析并得出了系统位错概率的数学模型，并给出了该模型和高斯近似模型的一系列数值仿真结果。

Set cover greedy algorithm is one of the commonly used algorithms for the test set problem. It is an open problem if the approximation ratio 2ln n+1 directly derived from the set cover problem can be improved.

集合覆盖贪心算法是测试集问题的一个常用近似算法，其由集合覆盖问题得到的近似比21nn+1能否改进是一个公开的问题。

Meshless method is a new numerical method on problem for determining solution of differential equation. It is an approximation method based on nodes, and doesn't need a mesh entirely or partly. Then the discontinuous problems and the extremely large deformations problems can be solved without the re-meshing techniques.

无网格方法是求解微分方程定解问题的一种新数值方法，它采用基于点的近似，可以彻底或部分地消除网格，因此在处理不连续和大变形问题时可以完全抛开网格重构。

Under small-scattering approximation the diffraction integral equation for determining distribution of diffracted light field is presented. Comparision is made with coupled wave theory and K.

本文首次将不均匀物体对光的散射过程引入到体全息图对再现光的衍射过程，在小信号近似下获得了衍射光场分布的积分方程，并与耦合波理论及K。

Meshless method is a new numerical method on problem for determining solution of partial differential equation. It is an approximation method based on nodes, and doesn't need a mesh entirely or partly. Then the discontinuous problems, the extremely large deformations problems, and movable boundary problems, etc, can be solved by use to meshless without the re-meshing techniques. And not only the calculated precision can be guaranteed, but also the calculated difficulty can be decreased.

无网格方法是求解微分方程定解问题的一种新的数值方法，它采用基于点的近似，可以彻底或部分地消除网格，因此在处理不连续、大变形、移动边界等问题时可以完全抛开网格重构，不仅可以保证计算的精度，而且可以减少计算难度。

Finally, the complex surfaces are developed by partition of the surfaces into small surface segment ,and approximation of the small segment with the developable surface between two Bezier curves.

最后，采用分片与近似的思想，给出了复杂曲面展开的算法，并提出由曲面面积和曲面展开面积的相对误差调节分片程度来满足精度要求。

There are two parts in this dissertation. In part one, the reaction scattering for the H3 system is studied using three-dimensional quantum mechanical coupled channel distorted wave approximation. In part two, a new form is proposed for interaction between an atom and a diatomic molecule.

本文分两部分：第一部分用三维量子力学耦合通道扭曲波方法研究了三氢系统的反应散射；第二部分提出了一种原子与双原子分子相互作用的新形式。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。