查询词典 approximation function

Based on the Green function technique,the authors have analyzed the effect of the decoupling approximation on treating the interelectronic correlations and then calculated the local moment,hybridization matrix element,and ground state energy of the one dimensional,symmetric,periodic Anderson model.

基于Green函数技术，作者首先分析了切断近似对处理一维对称周期Anderson模型中电子间关联的影响，然后计算了该模型的局域磁矩、杂化能量元和基态能量。

In part 3, utilizing the existing Lipschitz results and the property of Yosida approximation of monotone and continuous function, we prove the existence and uniqueness theorem of a general backward stochastic differential equation with monotone and continuous coefficient.

第三部分在系数仅满足单调连续这样一个新条件下，我们综合运用单调连续函数的Yosida逼近的性质以及Lipschitz条件下的已有结果，证明了一般形式的倒向随机微分方程解的存在唯一性。

V Roytburb′s results are generalized to inhomogeneous cases.Firstly,a monotone approximation to the flat function p is constructed,then the solutions of corresponding mudification system are estimated.

将V Roytburb的结果推广到非齐次情形，先对平坦函数p进行单调修正，再对修正方程组的解进行估计，最后比较原方程组的解和修正方程组解之间的关系。

In chapter III,we consider the wavelet method for the approximation of the nu-merical Bergman kernel.It is very clear that the Bergman kernel plays an importantrole in the complex analysis and elliptic equations.The Bergman kernel has a closedrelation with the Riemann mapping,Green function,Neumann kernel and the Szeg〓kernel etc.

第三章研究了数值Bergman核数值逼近的小波方法，Bergman核在复分析和椭圆型方程中占有重要地位，它与Riemann映射、Green函数、Neumann函数、核等有着密切联系。

The results of numerical experiments, using the four-dimensional variational data assimilation system of the nonhydrostatic mesoscale model MM5, show that: the tangent linear model and adjoint model conducted by keeping the "on-off" switches the same as the basic state, can provide a good approximation of the first-order information to the NLM perturbation and a good descent direction for the minimization procedure; switching on and off at every other time step in the Kuo cumulus parameterization scheme don"t impact the convergence rate of cost function; the existence of the switches don"t impact improvement to the MM5 model rainfall prediction because that not only specific humidity ,but also wind, temperature and pressure are assimilated into the model.

非静力中尺度数值模式MM5的四维变分资料同化系统进行的数值试验结果表明："开关"变量保持与基态一致，所构造的切向线性模式能够提供关于非线性模式扰动的一阶近似，伴随模式所计算的梯度值能够为最小化过程提供较好的下降方向；郭氏降水参数化方案中对流每隔一个积分步的交替发生并不影响目标函数最小化的收敛速度；"开关"变量的存在也不影响将风、温度、气压和比湿结合起来同化对MM5降水预报准确性的提高。

The ill-conditioned normal equations bring numerical problems in construction of macromodel in time domain for power distribution networking using rational function approximation.

摘要有理函数逼近法方程组病态条件数为构建电源分配网络时域宏模型带来了数值问题。

We also know that ArcSin is an odd function and therefore the second order term B*X*X is of no use in the approximation.

我们也知道 ArcSin 是一个奇函数，因此二次项 B*X*X 在近似中没有用。

The method of calculating the perturbed Chebyshev-Padé approximation is proposed for not only the general situation but also some special cases, i.e., an odd function and an even one.

提出了一种新的带有扰动的Chebyshev-Padé逼近，它依赖于一个扰动参数，其优点在于：它可以通过调整扰动参数来提高逼近的精度。

Nonseparable biorthogonal wavelets based on Checkerboard lattice is studied, and the upper bounds of approximation order and smoothness order of the corresponding scaling function are also proved.

研究了一类基于Checkerboard格点的不可分双正交小波，并证明了其尺度函数逼近阶与光滑性的上界。

Of course, this conversion between the old and the new CQFs can change the compactly supported, the regularity and the approximation order of the corresponding scaling function. However, for its appliction in signal processing, both the new and the old CQFs can produce identical output for a given input signal.

这种新旧CQFs转化将改变相对应的尺度函数的紧支撑性，正则性和逼近阶等，而在信号处理的过程中，对某一信号而言，用新旧两种CQFs作用可以产生同样的输出信号。

Many will continue to choose to live in duality and in conflict.

许多人将继续选择活在二元对立性和冲突中。

I find that students of the University of Physical Education all wear sportswear at first sight.

我发现：体育大学的学生乍一看，都是穿运动衣，大家都一样