查询词典 approximation theory

Finally, we prolongate the theory to two dimension tensor product wavelets space, proofing the best approximation property of product spline wavelets interpolation and constructing the parallel algorithm of the wavelets decomposition.

最后，我们继续将这一理论拓展到二维张量积小波空间，验证了乘积型样条小波插值的最佳逼近性质，进而在二维张量积小波空间构造了乘积型样条小波分解的并行算法。

This paper establishes the standard fuzzy system with partition of normal trigonometric membership function. Based on above standard fuzzy system, approximation error bounds problems are discussed by interpolation theory.

在标准模糊系统的基础上提出了以正规三角函数为基函数的一类模糊系统。

At last, the problem on nonlinear function universal approximation based on WNN is studied by computer simulation. and the theory derivation is also verified.

最后，通过对基于WNN的非线性函数一致逼近问题的仿真研究，进一步验证了理论分析的正确性。

In this dissertation, two problems in the variational inequality theory are mainly considered: the existence of solutions and the approximation schemes.

本文主要讨论了变分不等式理论中的两个方面的问题：解的存在性问题以及解的逼近问题。

By using the continuity equation and weak hydrody-namic interaction theory in the relaxation time approximation, the spatial variation of the radar scattering cross-sec-tion has been proved as proportional to the gradient of current velocity.

在浅海海流速度垂直分布廓线为均匀的假定下，由流体连续性方程和弛豫时间近似下流体力学弱相互作用的理论，已证明雷达散射截面的空间变化正比于海流方向上海流速度变化的梯度。

It has been shown that when the theoretical phase shifts are used the poor accuracy in the determination of the interatomic distance is due to the use of the plane-wave rather than the spherical-wave approximation in the EXAFS scattering theory.

研究结果证明：（1）在EXAFS测定C（2×2）S/Ni（100）金属吸附表面结构的数据处理中所发现的理论相移相对实验相移存在的较大误差来自于EXAFS散射理论中所采用的平面波近似。

Firstly, an empirical approximation model of stochastic programming is obtained by replacing the probability measure of original program with empirical probability measure. Sequentially, the constrained stochastic programming is transformed into an equivalent unconstrained stochastic programming. Finally, using the epi-convergence theory, the almost everywhere upper semiconvergence of optimal solution set of empirical approximations for stochastic programming is obtained.

首先通过经验概率测度替代初始规划的概率测度得到随机规划的经验逼近模型，然后将带有约束的随机规划问题转化成与其等价的无约束的随机规划问题，最后利用上图收敛性理论，给出了随机规划经验逼近最优解集的几乎处处上半收敛性。

Based on density functional theory with the generalized gradient approximation and a full-potential linearized augmented plane wave method, the calculation of the electronic structures and the magnetic properties on [Cuμ-1,3-N3](ClO4), where L is the tridentate Shiff base, has been performed.

基于广义梯度近似密度泛函和全势能线性缀加平面波方法，本文对聚铜络合物[Cuμ1，3-N3](ClO4)（其中L=tridentate Schiff base为三齿席夫基）的态密度和磁矩进行了计算。

A general form of Hamiltonian for vibronic Jahn-Teller systems is derived on the basis of adiabatic approximation and group theory. The electronic operators and active Jahn-Teller modes appeared in a vibronic system are also discussed.

本文基于绝热近似和群论导出了电声耦合系统的哈密顿量的一般形式，讨论了电声耦合系统中的电子算符和活跃的声子模式。

Based on the Lorentz-Mie theory, the single scattering characteristics of multi-dispersed spherical and multi-layered spherical particles are studied. The extinction coefficients, scattering coefficients, single albedos, single scattering phase functions and asymmetry factors of different clouds are presented. Numerical results for single scattering of spherical and non-spherical particles are obtained in the approximation of geometrical optics. The single scattering phase matrixes of non-spherical aerosols are calculated by using the T matrix method.

基于洛伦茨-米理论研究了服从一定尺寸分布的球形和多层球形粒子的单次散射特性，计算了各种不同类型云层的消光系数、散射系数、单次散射反照率、单次散射相函数以及不对称因子；利用几何光学方法计算了球形、非球形粒子的单次散射特性；利用T矩阵方法计算了非球形气溶胶的单次散射相矩阵。

It was just a normal day of school

那只是上学的普通一天

Which is a very good reference in this issue.

这是一个在这个问题上很好的参考。