查询词典 diffusion equation

In this paper, a high order accuracy difference method is presented for solving unsteady convection diffusion equation by using Implicit Perturbation Finite Difference scheme.

本文利用摄动差分思想，对定常对流扩散方程中的空间微商系数进行摄动展开，展开幂级数系数通过消去摄动格式修正微分方程的截断误差项求出，由此获得方程的隐式摄动差分格式，将此方法应用于非定常对流扩散方程，并加以修正，得到该方程的修正隐式摄动差分格式。

In this paper well use this covariant theory to discuss the prolongation structure of the integrable the inhomogeneous equation of the reaction-diffusion type: By establishing SL(2,R)principal bundle and its associated bundle and finding both 1-dimensional realization and 2-dimensional realization of its algera ,we can successfully give its AKNS-equations and Backlund transformation.

本文就是利用这套协变的延拓结构方法讨论了可积的非其次反应扩散型方程的延拓结构。通过建立SL(2，R)主丛及其伴丛，并找到其李代数的1维和2维实现，我们成功得到了其反散射方程和Backlund变换。

And then, the direct boundary integral equation of convection-diffusion was obtained by using inverse transformation, which is a discrete by using constant elements.

然后，通过逆变换推导出对流扩散方程的直接边界积分方程和解的积分表达式，并采用常单元来离散边界积分方程，完成对流扩散方程的求解。

A new method is presented in this paper for solving unsteady nonlinear convection-diffusion equation with the source term.

本文提出一种新的求解含源项，非定常、非线性对流扩散方程的数值方法。

In this paper, we use this numerical method and adopt operator splitting method to simulate the conduction model of action potential in two-dimensional cardiac ventricle tissue,the conduction model of the action potential in two-dimensional cardiac ventricle tissue is denoted by one reaction-diffusion equation with a series of ODE describing ionic channels of cell, at the same time,we adopt the compact alternate direct implicit difference method to simulate that model,compar-ing these value results,get some conlusions.

本文中，我们利用摄动有限差分方法和算子分裂思想去模拟二维心室肌中动作电位的传导模型，该模型由一个描述细胞离子通道的常微分方程组和一个反应扩散方程组成。

The general model, including axial dispersion flow for the bulk fluid phase, diffusion equation described by Fick law for the particle phase and the equilibrium concentration given by a modified competitive Langmuir isotherm, was presented and discretized with Galerkin and orthogonal collocation into a series of ordinary differential equations.

为考察孔内扩散对模拟移动床分离过程的作用，采用综合速率模型对其进行研究，其中流动相模型为轴向扩散活塞流，颗粒相为Fick定律描述的扩散方程，液相和固相之间的吸附平衡采用改进的Langmuir吸附等温线。

The parabolic partial differential equation is an important type of mathematical physical equations. It can describe the problems of heat conduction, seepage flow and diffusion, et al.

抛物型偏微分方程是描述热传导、渗流、扩散等过程的一类重要的数学物理方程。

The first step of simulation method is to establish the one-dimension parabolic partial differential advection diffusion equation that was used to describe the mass transportation model of air-pollution distribution as a block program model of the controllable plant. Then, applying the Fuzzy logic theory to operate tunnel jet-fans and control the tunnel wind quantity and adjust the wind average velocity would not let the air-pollution concentration over the standard safety value too much.

模拟方式首先将常被用以表示隧道内空气污染物质传理论模式之一维向平流扩散抛物线型偏微分方程式建构成一组可控制对象的方块程式模拟模型，再运用模糊逻辑理论模拟控制喷流式通风机之运转风量来调节隧道内平均风速以控制隧道内空气污染物浓度不至於高过标准安全值太多。

This paper developed Feynman-Kac theorem in connection with multidimensional Poisson jump-diffusion stochastic differential equation.

在随机分析学中，Feynman-Kac公式是联系概率论与偏微分方程的桥梁。

In this paper, a three-dimensional reaction-diffusion equation with a polynomial nonlinearity that possesses a global attractor is considered.

本文考虑具有整体吸引子的一类带有多项式非线性项的三维反应扩散方程。

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。