查询词典 backward difference

Douglas and Russell first presented the idea of characteristics in[13],in whichthe diffusion term is included in the derivative of characteristic direction of the solu-tion and the backward difference quotient along the time axis was replaced by it alongcharacteristic direction.

Douglas，Russell[13]最先提出了特征法的思想，其主要特点是将模型方程的对流项隐含在解沿特征方向的导数之中，以沿特征方向的向后差商逼近取代通常方法中沿时间方向的向后差商逼近。

What informatization builds is backward make the difference between medium and small businesses and big company is pulled further big.

信息化建设的落后使中小企业与大企业之间的差距进一步拉大。

Not only is the method applied in this paper better to solve the iteration between unsteady convection and conduction and the boundary condition problem, but also is a developmental application on forward and backward difference of windward scheme under unsteady condition.

不仅较好地解决了对流换热和导热的迭代求解和边界条件的处理问题，还将迎风格式的向前和向后差分发展性地应用于非稳态求解过程。

Growth pole theory constituted the national basis with the country with a lot of backward economy and area bigger difference economy develops the strategy, with period implementation economy grows quickly.

许多经济落后的国家和地区差异较大的国家依据增长极理论制定了经济发展战略，以期实现经济快速发展。

The problem gives a practicable methods to solve the existence and multiplicity of periodic and subharmonic solutions of second order forward and backward functional difference equations.

论文研究的问题和所得的结论具有比较重要的理论价值和应用价值。论文思路清晰，逻辑性强，推理严密，结论具有创新性。

Founds three-dimensional analytic model and analyses heat transfer with phase change with the help of numerical simulation software using Euler backward difference.

通过实验分析了冰水两相流在垂直和水平管道流动时的压降特性；建立了冰融解的三维分析模型，采用欧拉向后差分法，利用ANSYS数值模拟软件对冰水相变传热进行了数值模拟分析，得出冰粒大小与融解时间两者的关系曲线。

We found that it is the effect of odd-order term of f which describe the total energy collocation between forward wave and backward wave that causes the difference of modulation instability between normal dispersion region and abnormal dispersion region.

第三，根据增益谱的比较，我们从色散关系式中看到了产生这种变化的原因。正是由于存在f奇次项的影响而导致了这种在正常色散区和反常色散区变化趋势的不同。

Look from historical condition,; of economic technology instability looks from external environment, the infrastructure such as traffic, communication, irrigation works is backward, invest good environment difference, return rate is low.

从历史条件看，经济技术基础薄弱；从客观环境看，交通、通讯、水利等基础设施落后，投资硬环境差，回报率低。

While using three—points backward finite difference to imitate the radiation condition, we accept Raven's〓 idea to shift collocation points upstream a short distance.

在用三点向后差分格式模拟辐射条件时，接受了Raven〓的建议，将单元控制点向后移动了一段距离。

By analyzing the reason of the numerical oscillation phenomenon and computing the temperature field in plate rolling process,it is found that numerical oscillation can be restrained effectively when the heat capacity matrix is lumped by using backward difference scheme.

近年来，许多研究人员采用有限元法分析热轧和淬火等过程中的瞬态温度场。

A strange and mysterious deep sea creature.

一种奇异、神秘的深海生物。

It's a yellow rectangle .

这是黄色的长方形。