查询词典 difference boundary value problem

Based on the perfectly matched layer absorbing boundary condition, a new form of PML absorbing boundary condition in cylindrical coordinate suitable for optical fiber is derived.

在已有的完全匹配层吸收边界条件的基础上推导了圆柱坐标系下适用于光纤计算的PML吸收边界条件。

The deflection and moment wavelet parameters for common boundary conditions of beams were obtained from numerical features of interval boundary of BSWI functions.

根据BSWI函数区间边界的数值特征，得到了梁常见边界条件下的挠度和弯矩小波系数值。

The proposed method has the merit that the numerical characteristics of stochastic temperature field response can be obtained by analyzing the random temperature field just in one time.3. Perturbed numerical algorithm of nonprobabilistic convex set theoretical models on the temperature fieldThe uncertain parameters of physical parameters and initial boundary conditions of heat conduction are described by the convex model. The perturbation formulas of the upper and lower bounds of temperature field response with unknown-but-bounded parameters are given via the combination of matrix perturbation theory and the convex set theory model.4. Numerical analysis for transient temperature field with interval parametersConsidering the uncertainties of the transient heat transfer, the physical parameters and initial boundary conditions are regarded as interval variables.

该方法具有只进行一次随机温度场分析便可以获得其响应的数字特征的优点。3、温度场的非概率凸集合理论模型的摄动数值解法将结构导热的物理参数、温度场的初始和边界条件等不确定性参数以凸模型加以描述，基于矩阵摄动理论和处理不确定问题的凸集合理论模型的结合，导出有界不确定参数瞬态温度场响应所在集合的上、下界摄动计算公式。4、具有区间参数的瞬态温度场数值分析考虑结构瞬态热传导问题的不确定性，将结构各物理参数和温度的初、边值条件均视为区间变量。

In this research a new mathematical model - cubic polynom with two given derivatives at end points - was proposed which can good match the S-shpae curve.This model has a number of analytical features:describing the geographic phinomena prosesses in three hierarchies (textural fractal,structural fractal and state fractal); the boundary values of the structural fractal can be considered as the boundary values of interval of scaleless.

在研究中提出了扩展分维表达函数：带导数三次多项式，它能很好地表达反S形分布曲线，具有一系列解析特征：可从三个层次（纹理分形、结构分形和态势分形）上描述地理现象或过程；其中结构分形的边界可近似地看作是非扩展分维无标度区的上下界。

Every piece of boundary line is a common boundary between two areas.

每一条边界线都是相邻两个区域的边界。

The distance between a boundary point and its neighboring boundary points is used to detect the transitional points.

面对如此大量的数据如何提高数据的利用率是后序产品造型工作面临的严峻问题之一。

Its motion domain can be separated as two boundary points or a direction changing point of boundary.

其运动领域可分离为连杆轨迹曲线上的两个边界点或边界转向点。

And then adjust the position of apex adjacent to boundary point so as to satisfy the requirement of boundary normal.

DNA序列与正四面体中的映象点具有对应关系。

ANN is developed to calculate boundary point's angle with respect to the x-axis between clockwise or anti-clockwise boundary.

在一定的邻域内，夹角小的点被认为是主点。

Aimed at three kinds of boundary point s on the wall, the method is presented that the boundary point is measured by reducing angle and distance error and it is proved by theory and practice.

针对墙面上的三种界址点，提出以减少测角和测距误差的偏心法观测，并得到了理论和实践的论证，具有一定的实用价

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。