数值方法

High order symplectic schemes of three-dimensional time-domain Maxwell's equations are constructed with symplectic integrator technique combined with high order staggered difference. The method is used to analyzing stability and numerical dispersion of high order time-domain methods and symplectic schemes with matrix analysis and tensor product.

利用辛积分技术与高阶交错差分技术，建立求解三维时域Maxwell方程的高阶辛算法；结合电磁场中的物理概念，借助矩阵分析和张量分析理论，获得高阶时域方法及高阶辛算法的稳定性和数值色散性的统一处理新方法。

Experiments in texture mapping show that the proposed method has better performance than some popular parameterization methods.

将该方法应用于纹理映射中的数值实验表明，其比常见的几种参数化方法具有更好的纹理映射效果。

Under this background a new theory that combined with techniques derived from chaos theory, Shannon information theory, complexity analysis of time series, is presented, that is multi-order information theory of brain cortex. Then, its application to EEG analysis in different physiological states is investigated in this paper.

在对非线性动力学数值统计量方法用于不同生理状态下的脑电分析进行研究后，本文在前人工作的基础上，提出了建立在非线性理论基础上的大脑多阶信息理论，并利用该理论对不同生理条件下脑电地多阶信息量特征进行分析，并结合人工神经网络理论，研究了该方法在解决医学临床几个重要问题中的应用，初步得到了有意义的结论。

The basic idea of the proposed method is : At first, to obtain the fundamental solution of the governing equation through variables transformation and make the anisotropy remain in the numerical scheme;Then to apply the MFS to solve the problems in both spatial and time domains directly.

该方法的基本思路是，先通过变量变换得到控制方程的基本解，使各向异性继续保留在数值格式中，然后用基本解方法直接在整个时间空间区域上对问题进行求解。

In fact the advantage of our coordinates transformation method is that the effective potential is more convenient to deal with than complex boundary conditions in numerical calculations.

实际上我们采用的坐标变换方法的优点就在于把非平面界面上的边界条件转化为了更利于用数值计算方法处理的平面界面系统中的有效势场。

Numerical method for calculating the exact all-time apparent resistivity for time domain transient electromagnetic method is proposed in this paper.

bstract 给出了一种时间域瞬变电磁法视电阻率的数值计算方法，利用该方法可以容易地求出中心方式的全程视电阻率。

A numerical method for calculating the exact all-time apparent resistivity for time domain transient electromagnetic method is proposed in this paper.

给出了一种时间域瞬变电磁法视电阻率的数值计算方法，利用该方法可以容易地求出中心方式的全程视电阻率。

A numerical method for calculating the exact alltime apparent resistivity for time domain transient electromagnetic method is proposed in this paper.

给出了一种时间域瞬变电磁法视电阻率的数值计算方法，利用该方法可以容易地求出中心方式的全程视电阻率。

it was a routine way for graph- drawing based on coordinate data in application software to program and graph processing,because from coordinate data to graph it is uniqueness.in hydrologic analysis,we calculated related data according to figure parameters,as using rainstorm isoline to reckon average rainfall in the river basin.through examples and analysis,the paper proposed methods for curve numerical translation and area calculation by vb.

在应用程序编制和图形处理的软件系统中由坐标数据可以绘出图形是常规的途径，但有曲线图形，要生成坐标数据，至今还没有通用的方法，因为由坐标生成图形是唯一的，而反过来由图形转换为数据是非唯一的。在水文分析计算时，有时需要根据图形参数进行有关数据的计算，如用暴雨等值线图计算流域平均雨给出量的时候。通过分析和计算实例提出了利用vb实现可满足使用要求的曲线数值转换和封闭图形的面积计算方法。

Via studying elastic torsion with trapezium sections, the results obtained by this method could approach the ones obtained by finite method.

通过研究梯形截面弹性体的扭转问题，表明结果与有限元数值计算结果很接近，该方法具有较高的精度，为边值问题的研究和求解提供了一种新的数学方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。