近似计算

Since any approximations, such as numerical Laplace inversion, backward differentiation formula, nonlinear model of switch, do not exist, the new algorithms are accurate.

由于该方法不存在任何极限近似问题（数值拉普拉斯反变换法，后向差分法，非线性开关模型法等），因而它是一种精确计算方法。

Usually, they are suitable to mixed crystals with metallic bond but not to those with covalent bond or ionic bond.

上述近似方法通常适用于金属键混晶系统，但对于共价键或离子键混晶系统计算结果则不理想。

This paper analyses character of joggle and introduces a way to develop joggle based on the rule of geometric modeling method, applying this method, the author developed a software to develop joggle approximately and to display the result by doing secondary development based CATIA using CAA. Finally, author shows an example to demonstrate the result of the software.

本文分析了下陷结构的特点并以几何模拟法为理论基础提出了下陷展开方案，使用CAA对CATIA进行二次开发，完成了弯边零件下陷区域展开功能模块的编写，实现了下陷区域的近似展开计算和展开结果的图形显示，并给出了实例。

When the scale of the system is enlarged, the computational quantity is increased linearly.

新算法在系统规模扩大时，计算量的增长方式近似线性。

According to the theoretical and experimental results, the approximate curves of dynamic load factor of W-N gear are put forward.

根据理论计算和实验结果，本文给出了双圆弧齿轮动载系数的近似曲线。

When the flow of the river and the capability of the river diversion follow normal distribution or logarithmic Normal distribution or Pearson—Ⅲ distribution, the point estimation and the one order or two order approximately interval estimation of the risk probability of the criteria of river diversion are given.

并根据河道来流量和导流系统设计泄流能力分别服从正态分布、对数正态分布以及皮尔逊—Ⅲ型分布的分布形式，给出了施工导流标准风险率的点估计和一阶、二阶近似区间估计的计算公式。

Meanwhile,according to the results we draw the flood insurance loss probability curve,and concluded that it is similar to lognormal distribution.

同时，根据计算结果得到洪水保险损失概率曲线，认为洪水保险损失近似服从对数正态分布。

DRBEM requires inversion of a matrix formed by approximation function, which makes this method inefficient for large problem.

在双互易边界元法中需要对由近似函数形成的矩阵求逆，这在计算大型的实际工程问题是很费时的。

Under the small-signal approximation, the effects of the waveguide length and the response flatness on DFG-based wavelength conversion are investigated by use of matrix operator, and then a feasible scheme to expand conversion bandwidth and pump bandwidth is proposed.

在小信号近似条件下，利用矩阵计算的方法分析了波导长度和转换效率的波动性对基于差频效应的波长转换器带宽的影响，给出了扩展信号光转换带宽和抽运带宽的优化设计方案。

In addition, an algorithm based on rgh-tree, which is suitable for similarity search in metric space, is presented in this paper.

另外，在rgh-tree的基础上提出了相应的相似性搜索算法，该算法具有较小的I/O代价和距离计算次数，平均复杂性近似为o(n0.58)。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。