查询词典 approximation theory

The theory frame of wavelet approximation for the solution of ODE is put forward.

提出了微分方程解的小波逼近的理论框架。

Based on the classical theory of electromagnetism, the relation and the difference between OAM and the parameter of the beam in paraxial approximation are analyzed.

从经典电磁场理论出发，主要介绍了傍轴近似条件下，光束的轨道角动量和光束的参数之间的关系。

We must seek two main approximation methods of solution , the variation method and perturbation theory

我们必须寻求两个主要的近似解法、变分法和微扰法。

A Study on Fraunhofer Double-Slit Diffraction by Applying Simulation Technology;2. Based on Kirchhoffs theory,the approximate intensity formulas of double-slit diffraction of Gaussian Beam is derived under paraxial approximation with power series expansion methods.

依据基尔霍夫衍射理论，利用幂级数展开的方法推导出旁轴条件下高斯光束双缝衍射的近似光强计算公式，并通过数值计算对双缝衍射的基本特性进行了讨论，得出了与其他文献一致的结论，得出了高斯光束下的双缝衍射极小值点比平行光束双缝衍射的极小值点向外移，观察屏中心光能变小；光强分布可由激光斑在衍射屏处的参数调制的结论。

The anodic oxidation reactions of borohydride ion involves a novel and complex reaction system of three hydrogen valence states: protide H(superscript --protium H(superscript 0*-proton H(superscript +. Based on cyclic voltammetry and polarization studies, a multi-step mechanism for the oxidation of BH4-on Cu anode in NaOH solution was presented, and a kinetic expression containing the coverages of BH(superscript - subscript 4) and OH-adsorbed on the surface of Cu anode was deduced by the steady state approximation theory.

鉴于BH(上标-下标 4)阳极氧化反应涉及一个复杂的氢负离子H(上标-下标 4)－氢单原子H(上标 0*)－质子H之间价态转化的新颖反应体系，在循环伏安和极化实验研究基础上，提出了NaOH溶液中BH(上标-下标 4)在Cu电极上氧化反应的多步骤机理，导出了包含表面吸附态BH(上标-下标 4， ad)和OH覆盖率θ和θ的电极反应动力学方程。

We present quantum mechanical vibrational computations beyond the harmonic approximation from effective second order perturbative and variation perturbation treatments defined as static approaches, as well as vibrational analysis from density functional theory molecular dynamics trajectories at 300 and 600 K.

利用超简谐振动近似的有效二阶微扰法(VPT2)和变异微扰法两种静态方法，以及在300和600K下的密度泛函分子动态轨线振动分析方法进行量子力学的振动计算。

Secondly, based on spectral representation theory and self-consistent mean field approximation, we study temperature effect on optical bistability of metal-dielectric granular composite under strong external field in the dilute limit by in MG model.

在谱表示和自洽平均场近似基础上，用Maxwell-Garnett 模型研究了在稀释极限下的金属-电介质颗粒复合体在强场作用下的双稳结构的温度效应。

Keywords Composite materials, Non-linear optical response, Spectral representation theory, Self-consistent mean field approximation, Optical bistability

Article From 苏州大学；理论物理硕士论文 2004年度颗粒复合体系；非线性光学响应；谱表示理论；自洽平均场近似；光学双稳

Tang's first-order mean spherical approximation equation of state based on the theory of RDF is a totally theoretical EOS.

本文运用Tang基于FMSA开发的应用软件计算了LJ流体的径向分布函数、压缩因子、等温线以及汽液相共存相图等，并与分子模拟的结果相比较。

According to stochastic approximation theory, when deterministic continuous time method is used to analyze convergence of MCA learning algorithms, the learning rate is required to approach to zero.

具有固定学习速度的MCA学习算法的收敛性分析根据随机逼近理论，当确定连续时间方法被用于分析MCA学习算法的收敛性时，学习速度被要求趋于零。

Sodium citrate; calcium carbonate; calcium hydroxide; potassium bicorbonate; magnesium carbonate; ferrous sulphate; Zinc sulphate; copper sulphate; manganese sulphate; potassium iodide; sodium selenite.

柠檬酸钠；碳酸钙；氢氧化钙；碳酸氢钾；碳酸镁；硫酸亚铁；硫酸锌；硫酸铜；硫酸锰；碘化钾；亚硒酸钠。

All this to say that I'm glad filmmaking hasn't become completely ironic. I can enjoy an ironic film as much as the next person, but they usually involve a message of some sort. One that's delivered in a smirkingly clever way that requires little in the way of talent.

所有这些都是说，我很高兴电影制作没有变成完全讽刺艺术，我可以和下一个人一样享受讽刺电影的乐趣，虽然他们经常会被划归到一定级别，技术方面不需要很高的才能。