查询词典 difference equation

This equation shows that, the anodic processes overpotential difference between the anode and cathode is an important factor for the corrosion process.

方程表明，在电池的阴极和阳极上，铁的阳极极化过电位差值，是影响氧浓差腐蚀过程的重要因素。

Up to now, finite difference method, finite element method and boundary element method are common numerical methods to obtain numerical solutions of parabolic partial differential equation.

目前求解抛物型偏微分方程的数值方法有有限差分法、有限元法和边界元法等。

First, the paper proves the well-posedness of the encryption and decryption problems, which provides theoretical bases for experiments of encryption and decryption; Then presents a fast iterative algorithm, which is proposed based on the special sparse structure of the coefficient matrix of the two-dimensional C-N difference scheme, and successfully experiments on images encryption and decryption; At the end, the security of the methods of images encryption and decryption based on the two-dimensional Pseudo -parabolic Partial Differential Equation is experimented and discussed particularly.

首先证明了基于二维连续模型的加、解密问题是适定的，为加、解密实验提供了理论依据；然后根据模型的二维C-N格式系数矩阵的特殊稀疏结构，给出快速迭代求解算法，并成功地进行了图像加、解密的数值试验；最后对基于二维伪抛物型方程的图像加、解密方法的安全性进行了详细的试验讨论。

The difference between fabrication of binary optic element and that of continuous- relief MOE may not be ignored.A reciprocal equation among the depth,exposure,density of the developer and its etching time was inferred,with the appropriate conditions that proved to be useful for the MOE fabrications.

分析了光刻胶及显影液在制作二元和连续元件中所存在的差别；导出具有倒易关系的浮雕深度表达式和适用的范围，并以此指导面形的控制，对光刻胶进行适当的改造以适应连续微光学元件的制作。

Methods to seek the result of the recursion equation are analyzed in the article, and the difference and application range of the methods are compared, then how to express algorithm complexity and its adjacent rank are analyzed.

分析了递归方程常用解法，比较了各个解法的区别及使用范围，并研究了如何表示递归方程对应的算法复杂度的渐进阶。

METHODS The partial differential equation is reduced into a set of ordinary differential equations by using finite difference method.

采用有限差分方法，将偏微分方程组约化为常微分方程组。

The FFT of Helmholtz equation on the regular domain is studied. And the multifrontal algorithm is used to solve the matrix equations in computational electromagnetics.Finally, the finite-difference approximate forms of Maxwell equations and the Despres transmission condition are discussed.

为了充分提高算法的计算效率，研究了规则区域上Helmholtz方程的FFT快速算法，以及有效地将多波前算法引入计算电磁学领域用于求解差分稀疏矩阵方程。

In order to investigate and develop numerical calculation method for Schr odinger equation, we apply the finite difference method to eigenvalue problems in quantum mechanics.

为研究和发展薛定谔方程的数值计算方法，本文将有限差分法应用到量子力学求解薛定谔方程本征值问题。

The volume integral equation is also studied in this paper, and the fast multipole method is extended to VIE for analysis of electrical large objects. The difference of the application of FMM to SIE and VIE is emphasized in this paper.

本文研究了体积分方程的应用，并将FMM推广到体积分方程的快速计算中，着重讨论了与用于分析面积分方程FMM的不同。

The increase process of dry weight per unit volume,ratio between seed and silique shell and 1000 grain weight of yellow and black seeds of recessive GMS in B.napus L. were from slow to quick and then returned to slow, the same genetic back ground of tallied with the logistic equation. The ripening characteristics of materials tested showed no marked difference.

王华具有相同遗传背景的油菜黄籽与黑籽隐性核不育材料在成熟过程中单位体积干重、籽壳比、千粒重的增长呈现由慢到快再到慢的过程，符合Logistic方程，各材料成熟特性无显著差异。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。