数值分析

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。

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。

And the observational analysis and modelling study have focus on tropical SSTA in relation to Asian winter monsoon and low--latitude Pacific trade wind.

观测分析和数值模拟还注重于分析热带海表温度异常对亚洲冬季风系统和热带太平洋信风的影响。

The transformation of coordinates,interactive model,and numerical methods were introduced for the dynamic analyses of deep groove ball bearings.

根据空间坐标变换建立接触和碰撞模型，利用数值方法计算分析，编写了适用于深沟球轴承的拟静力学以及动力学分析的软件包BA。

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。

Through the contrast analysis of laboratory model test and numerical simulation, the trueness and rationality of theory were proved.

通过实验室模型试验和数值模拟的对比分析，验证了理论分析的正确性和合理性。

This paper makes a systematical theoretical analysis and numerical simulation about heat transfer in underground tunnel of hydropower station.

本文对水电站厂房采用坝体廊道送风的方式进行了系统的理论分析与数值模拟计算，并与实验数据进行了验证分析。

Numerical simulations were done for a bistable latch valve of the system by FLUENT, and three groups of datum for different fluids were obtained with the same effective exit sectional area. Besides, a static mathematic model for the electromagnetic valve was established based on the obtained datum. Secondly, the motion of the valve spool was realized by UDF file in FLUENT. Three kinds of motions, uniform, acceleration and motion driven by the coupling effect of the liquid resistance and the electromagnetic force, were calculated and compared. The dynamic characteristic of the electromagnetic valve was obtained by analyzing the relationship of the mass flow rate of the inside flow field of the electromagnetic valve, the change of the drop pressure of the passageway of the valve, and motion time.

并针对系统中的某双稳态电磁阀，使用商用CFD软件FLUENT对其进行内部流场的数值模拟，通过使用不同流体介质，不改变阀门有效出口截面积的情况下，分析得到的三组数据，建立了该电磁阀的静态数学模型；通过编写UDF文件，实现对阀芯运动方程的控制，在阀门做由闭合到开启、开启到闭合运动时，控制阀芯分别做匀速运动、匀加速运动以及阀芯受到液体阻力与电磁力作用力的耦合力的运动，分析了三种工况下电磁阀内部流场质量流率和阀门出口入口压降的变化以及运动时间，从而得到该电磁阀的动态特性。

Spatio-temporal symmetry-breaking of temperature field in a small spatially distributed Lindemann unimolecular chemical reaction-diffusion-heat conduction system was studied by means of linear stability analysis, bifurcation analysis, and computer numerical simulation.

运用线性稳定性分析、分支分析和计算机数值模拟手段研究了小尺度空间展布、伴有扩散和热传导的Lindemann单分子化学反应体系的温度场时空对称破缺。

Based on parameters analysis and calculated figures of rolling mill drive system, we analyze broken causation of this kind universal joint shaft first made in China.

通过对小H型钢轧机传动系统的参数分析和计算数值，来分析轧机万向接轴在首次国产化过程中十字轴断裂频繁以及花键卡死的原因。

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。