查询词典 finite difference approximation

The existence of a nonnegative finite difference solution and threemonotone iterative algorithms for the computation of the solu...

主要内容包括利用三种单调迭代算法计算相应的差分解，讨论非负差分解的存在性和唯一性，讨论非定常问题差分解的渐近性。

Third,a semi-numerical method that uses finite difference for time toreplace Laplace transform for time is presented.

第三，提出了分布参数系统的半数值解析方法，通过对时间导数项用配置法进行差分离散，避免了Laplace变换。

The comparison study with the Laplace transform method of solving the transient temperature distribution and the finite difference method have discussed.

尤其对温度场的边界元求法、模腔的瞬态温度场分析进行了数学推导，对制品瞬态温度场的拉普拉斯变换法求解和有限差分法的求解进行了对比。

To solve the optimization problems, apply the DCA （difference of convex functions algori-thms） which is a general framework for nonconvex continuous optimization. This leads to a successive linear programming algorithm with finite convergence.

为解决优化问题，应用了突函数差异算法（difference of convex functions algorithms，DCA）这一进行非突连续优化的通用框架，致使连续线性规划算法有限收敛。

In Chapter 4, a symmetric triangular partitioned secant method for solving large scale sparse unconstrained optimization problems is constructed, which is a combination of a secant method and a finite difference method, and depends on a consistent partition of the columns of the lower triangular part of the Hessian matrix; it reduces the number of gradient evaluations required by Powell and Toints algorithm (the indirect lower triangular substitution algorithm) by one at every iterative step.

此算法是基于稀疏Hesse阵的下三角部分的列的相容分划的基础上建立起来的，把割线法和有限差分法有机的结合在了一起，在每次迭代中，把由Powell和Toint的算法所需要的梯度赋值次数减少了一。

Besides, the friction was calculated with the method of finite difference in different technological condition.

在分析冷隔形成机制的基础上，计算了不同工艺条件下的液穴形状和深度。

Using the kinetic model, the coagulation kinetics was calculated by the method of finite difference.

采用有限差分法对建立的混凝动力学模型进行了数值计算。

An ultra-wideband microwave imaging scheme with separated transmitter and receiver was investigated by using finite difference time domain method.

摘要介绍了一种基于半球模型的早期乳腺癌超宽带微波成像检测方案。

Computer simulation and design were performed on the basis of the method of moments by using a software package (IE3D), and a Finite-Difference Time-Domain code.

本文的计算机仿真和设计使用基于矩量法的软件工具包（IE3D），以及时域有限差分方法代码实现。

Wave equations, which were derivate from the stiffness Matrix of anisotropy monocline symmetry system, may meet different azimuth modeling of 2-D finite difference.

从各向异性单斜对称系统的刚性矩阵推导出的波动方程，可以满足EDA介质模型不同方位角入射的二维差分模拟要求。

We have something to do in the new stage.

在这段崭新的时期中，我们有一些要做的。

The difference between tourism decision-making under uncertainty and risky tourism decision-making is indistinctive.

其中不确定性旅游决策和风险旅游决策的界线比较模糊，两者的区分是相对的。