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数值近似
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  numerical approximation
     Numerical Approximation to a Class of Second Order Two-point Singular Boundary Value Problems
     一类二阶两点奇异边值问题的数值近似
短句来源
     From the relationship between the Caputo derivative and Grunwald derivative,the discretion for the fractional derivative is proposed by using the standard numerical approximation of Grunwald derivative.
     通过Caputo型与G runwald型的分数阶导数的转化关系以及利用G runwald型的标准数值近似公式对Caputo型分数阶导数进行离散,可构建时间分数阶扩散方程初边值问题的隐式有限差分格式。
短句来源
     A Riesz fractional reaction-dispersion equation(RFRDE) is obtained from the classical reaction-dispersion equation by replacing the second-order space derivative with a Riesz derivative of order β∈(1,2].Using the relationship between the Riemann-Liouville definition and the Grünwald-Letnikov definition,an explicit numerical approximation is presented.The stability and convergence of the approximation are analyzed.Finally,some numerical examples are given.
     这个方程是将一般的反应-扩散方程的二阶导用Riesz导数来替换. 利用Riemann-Liouville定义和Grünwald-Letnikov定义之间的关系,我们提出了一个显示的数值近似,同时讨论了稳定性与收敛性,并给出数值例子.
短句来源
     from precision to numerical approximation;
     从精确到数值近似;
     Total field is divided into two parts:background field and scattering field in forward modeling concerning with each iteration in the article,the background field is calculated by FFM numerical approximation;
     文中每次进行迭代涉及的正演模拟把总场分为背景场和散射场两部分 ,背景场使用解析法计算 ,而散射场使用 FFM数值近似方法计算 ;
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  numerical approximate
     In solving differential equation by means of discrete equations, the nonnegativity conditions of numerical approximate solution are studied and some types of discrete equations which will satisfy the condition are enumerated. The study starts from a discussion on the nonnegativity condition of the inverse matrix A~(-1) of matricesx A.
     本文从讨论矩阵A的逆矩阵A~(-1)非负的条件出发,研究用离散方程组求解微分方程数值近似解不出负的条件,并列举出一些类型的离散方程组是能满足这些条件。
短句来源
     In this paper the approximate solution of nonlinear vibration differential equations is given by Gauss's principle. This is the same conclusion of approximate solution of nonlinear vibration differential equation as is obtained by perturbation methods (such as: Lindstedt - Poincare method, KBM method ) which are usually employed in nonlinear vibration theory. The prillciple and method of this solutioll are not Only simpler but also accurater than the other numerical approximate solution (such as the least square method ).
     本文将Gauss原理用于求解某些非线性振动微分方程的近似解,其结果与非线性振动理论中常用的摄动法(如:Lindstedt-Poincare法,KBM法等)所得结果完全一致,而与其它数值近似解法(如最小二乘法等)相比.不仅原理及方法简单,而且也较为精确.
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  “数值近似”译为未确定词的双语例句
     Synthesizing the data of CFCP and NFCP, it was summerized that the FCP of accessions from different latitudes were approximately as follows: 50°N: 16-16. 5hr.
     CFCP与NFCP数值近似。 50°N材料为16—16.5小时;
短句来源
     Numerical Simulation of Mathematical Model for Subcutaneously Injected Insulin
     皮下注射胰岛素数学模型的数值近似
短句来源
     The results show that as the quench rate increases, the ultimate tensile strength, yield strength and Vickers hardness of the α (Al) matrix of the alloy all increase remarkably; with the peak aged condition, both σ b and σ 0.2 are logarithmic functions of the quenching rate;
     结果表明 ,随着淬火速率的提高 ,合金的抗拉强度、屈服强度以及α(Al)相的显微硬度均有提高 ,抗拉强度和屈服强度与淬火速率的对数值近似成线性关系。
短句来源
     Empirical formulae that can be used to characterize the breaking of solitary waves are presented, including the breaking index, the wave height, the water depth, and the maximum particle velocity at the point of breaking.
     研究结果显示这些物理量可以经由几个基本参数包括海底斜坡之坡度、入射波之波高与波形之尖锐度等来加以表示,并提出一些关于孤立波碎波指针之数值近似经验公式,经与其它学者所发表之结果大致上均有相当吻合的趋势。
短句来源
     Simulation experiments showed that under the approximate calculation and finite length cutting-tail situation, separation algorithms remain valid.
     仿真实验结果表明,在采用数值近似计算和有限位截尾的情况下,分离算法依然有效。
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  numerical approximation
In this paper, the numerical approximation by Galerkin method for completely compressible miscible displacement with molecular diffusion and dispersion in porous media is considered.
      
It could eventually be used to validate those found by numerical approximation techniques.
      
We present here a numerical approximation for the Fe Kα emission line using analytical functions.
      
Second, based on the assumption that indexes are monotonic for the requirements, an algorithm is proposed and applied to numerical approximation of monotonic indexes requirement locus with hyperboxes.
      
In this paper we introduce and analyze a new approach for the numerical approximation of Maxwell's equations in the frequency domain.
      
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  numerical approximate
Numerical approximate computations can solve large and complex problems fast.
      
In this paper, we build a bridge by which exact results can be obtained by numerical approximate computations.
      
The numerical approximate schemes for both problems on a bounded or unbounded domain in R3 are proposed and their prior error estimates are obtained.
      
Rofman, is adapted and reformulated for the problem at hand in order to obtain an error estimate for the numerical approximate solutions.
      


A simplified equation of state has been developed for square well fluids on thebasis of statistical mechanics. In derivation, the equare well potential is treated assuperposition of hard sphere potential and a short range uniform negative potential.and the radial distribution function of square well fluids is replaced by thecarresponding value of hard spheres approximately. The results of testing with the use of the malecular dynamic data of squarewell fluids indicate that this equation can de compared with...

A simplified equation of state has been developed for square well fluids on thebasis of statistical mechanics. In derivation, the equare well potential is treated assuperposition of hard sphere potential and a short range uniform negative potential.and the radial distribution function of square well fluids is replaced by thecarresponding value of hard spheres approximately. The results of testing with the use of the malecular dynamic data of squarewell fluids indicate that this equation can de compared with the first orderperturbation theory. and has shown itself more simpler and flexible. This equationalso provides a reasonable and reliable foundation for the further studying of thepractical fluid equation of state.

本文在统计力学的基础上建立了一简化的方阱流体状态方程式。推导时,方阱位能函数处理为硬球位能函数与一短程均匀负势的迭加,方阱流体的径向分布函数则用相应的硬球数值近似替代。用方阱流体的分子动力学数据检验表明,本方程可与一级微扰理论相比拟,但更为简单与灵活。本方程为进一步研究真实流体状态方程式提供了合理与可靠的基础。

In this paper, two approximate computations of the generalized reflectivity of P-SV waves in the transition layer are presented. In one computation, the transition layer medium is taken as a series of layered mediums. In the other computation, a numerical calculation is carried out directly for the transition layer model. The numerical results are discussed.

本文导出计算过渡层介质中P-SV波广义反射系数的两种近似算式:一种以层状介质作为过渡层的近似模型;另一种是直接由过渡层模型用数值近似方法计算。文中对比分析了数值试验结果。

This paper presents a finite element method to solve the shallow water circulation problem numerically.

考虑涡流粘性,底部摩擦,Coriolis力和重力作用,以单层模型的竖直向积分建立二维流动的环流控制方程。用Galerkin加权余量法建立环流边值问题的弱形式。用有限元法和分裂时间法分别离散空间和时间进行数值近似计算。采用线性内插的“人工光滑”处理以消除短波长噪音干扰,而避免已有的大阻尼系数方法等缺陷。为节省计算内存容量,程序中建立稀疏矩阵的一维紧凑存贮格式,排除了全部“零”元素的容量要求。

 
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