数值方法

For the numerical integration in time, the fraction step method is used. This method is useful because one can use the same linear interpolation functions for both velocity and pressure.

在时间域上采用分步格式计算，这种方法与混合插值方法比较其优点是速度和压力可使用同阶线性插值，给数值计算带来很大方便。

However, In practice, It needs higher condition by using local optimization methods and depending the computer resources.

变分同化技术被公认为是提高数值模式初始场质量的有效技术，但其目前所使用的方法是局部优化方法，它依赖于计算机资源，在实际业务中实现要求有较高的条件。

In order to obtain spectrum intensity distribution inside a circular luminant without damage,a measuring method depending on Abel transform was developed.

为了在无损状态下获得圆截面发光体内部谱线强度空间相对分布，提出了利用Abel变换，将被检对象外部的逐层扫描数据通过3次样条函数方法数值求解，从而得到被检对象内部参数分布情况的实验方法。

Based on investigating the short and intermittent structural plane, surrounding rockmass of the huge underground powerhouse in Three Gorge has been divided into five statistical similar areas according to its characteristic of rockmass structure by applying structure plane network simulation. Distributed characteristic of structural plane has been studied and based on it mechanics macrocharacteristic has been studied:(1) It is the first time that based on the result of structural plane network simulation rockmass quality of every structure area has been studied with applying blurred information optimum seeking technique and be compared with and RQD method. The result indicated that it has better effect to evaluate rock quality with blurred information optimum seeking technique.(2) It is the first time that the interrelated relationship of the result of in-suit rockmass deformation test and fractal characteristic of structure on test point has been applied to determine rockmass deformation parameter. The question of evaluating deformation parameters of engineering rockmass has been solved.(3) Anisotropy strength parameters have been determined by applying shear zones simulating method. The result indicated that there are different strength parameters in every structural area, after comparing the result of Fast Lagranian Analysis in continua number simulation method with that of method of weighted mean according to continuity. The result indicated that when a suitable reduction coefficient is been considered rockmass strength parameters can be simply and fast determined with method of weighted mean according to continuity where there is not enough test result.(4) Damage characteristic has been studied based on analysis fractal characteristic of structural plane network by applying fractal-damage coupling method. It is the first time that the concept of damage degree has been set up to evaluate rockmass quality according to the biggest principal damage.

通过对短小、断续性结构面统计特征的研究，将地下厂房区划分为五个岩体结构统计均质区，应用结构面网络模拟技术研究了各个岩体结构均质区结构面的发育分布特征，并以此为基础对岩体宏观力学特性进行了深入研究：(1)首次通过在结构面网络模拟计算结果的基础上，应用模糊信息优化技术研究了厂房区各个岩体结构分区的岩体质量并与岩体基本质量指标研究法、岩体质量指标RQD值研究法作了对比，结果表明以结构面网络模拟结果为基础，应用模糊信息优化技术进行岩体质量评价能够取得很好的效果，解决了工程岩体质量的定量评价问题；(2)首次通过对已有的现场大型岩体变形试验结果的分析及相应试验点岩体结构分形特征的研究，建立了结构面分布的分形维数和岩体变形指标间的相关关系，并首次应用这种相关关系根据结构面网络模拟及分形维数计算结果确定了缺少试验结果的地下厂房各工程部位的岩体变形指标而且应用于围岩稳定性计算，解决了工程岩体宏观变形参数的评价问题；(3)应用在结构面模拟网络图上模拟岩体剪切破坏带的方法，得出了岩体在不同方向上的强度参数，结果表明岩体的强度特性与结构面的发育方向和程度有着明显的关系，各个岩体结构均质区具有不同的强度参数；同时还通过应用拉格朗日差分法对岩体强度指标的数值分析并与按连通率加权平均计算法对比表明，按连通率加权平均计算法在考虑合理的折减系数情况下，可以简单快速地对缺少现场大型试验结果的具体工程部位实现岩体强度指标的估计，通过以上研究解决了工程岩体抗剪强度参数的评价问题；(4)通过结构面网络分形维数的研究，应用分形损伤耦合分析方法，研究了厂房区岩体的损伤特征，并首次引入"损伤度"的概念，建立了应用最大主损伤评价岩体质量的指标体系。

We study a kind of efficient approximation method: maximum entropy method for multiobjective minimax problems from the point view of numerical computation.

本文从数值计算的角度对求解多目标minimax问题的一种有效的逼近方法：极大熵方法进行了研究。

In digital process method of the I-V characteristic curves of the probe, we carry out the smooth treatment of the curves and obtain the second derivatives of the curves, using the ready-made software ORIGIN5.O. This is a simple and effective method.

在对探针特性曲线的数值处理方法上，采用了现成软件Origin5.0先对其进行光滑处理，然后进行二次微分的方法，取得了良好的效果。

But these traditional methods have certain drawbacks and limitations. To contain solution's reliability and stability the regularization is often adopted. The effectiveness of a regularization method depends strongly on the choice of a good regularization parameter.

在反问题的理论及数值计算方面，国内外的科学家做了大量的工作，提出了不少经典的数学和物理方法，但这些传统的方法都有其一定的缺陷或局限性。

Simulation results for the images with different structure and contrast show that TTLS method can yield high quality image and its application field is larger than that of Tikhonov regularization method.

对不同结构以及不同对比度图像的数值仿真结果显示，截断完全最小二乘正则化方法，较只考虑数据项存在误差的Tikhonov正则化方法成像质量高，且适用范围广。

In this thesis, the mechanical properties of PVC/Al_2O_3 nano-filler composites were researched. And the relationship between microscopic deformation mechanisms and macroscopic mechanical properties was investigated by micromechanics method and finite element methods.

本论文对制备的PVC／纳米Al_2O_3复合材料进行了力学性能测试，主要利用细观力学方法和有限元数值分析方法研究了复合材料微观变形机理和宏观力学性能之间的关系。

The steps of determined MIRV missile separation sequence was explained by calculating numerical example. It is a good assistant method of determining MIRV missile separation sequence.

通过数值示例计算说明了子弹头分导方法的确定步骤，为多弹头导弹分导方法的选择与确定提供了一种有效的辅助手段。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。