数值方法

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。

A method of velocity tomographic inversion based on Fermat principle is presented by using travel times of transmitted waves from one borehole to another.

利用井间透射波旅行时，给出了一种以费马原理为基础的井间地震弯曲射线速度层析成象方法，数值计算表明了该方法比直射线法反演成象精度高。

Most of the current finite element software packages treat it using the net-radiation method or absorbed radiation method based on the assumption of isothermal surface with uniform radiation heat flux,which brings the conflict between the precision and the quantity of grids.

进行了选用高阶单元、采用高斯积分精确计算单元表面变辐射热流方法的研究，从而摆脱了一致表面温度和辐射热流的假设，使得在相同网格密度的情况下计算精度大大提高；同时，从包含辐射换热问题的有限元计算方程出发，采用与有限元数值计算时相同的积分方案，只在独立的积分点处计算辐射热流，克服了积分方法计算效率低的缺点。

Numerical experiments have been made on certain knapsack problems and computational results show that the proposed algorithm is very promising.

以背包问题为例进行的数值实验表明，该方法是求解线性0-1规划的行之有效的实用方法。

Distributed Lagrange multiplier/fictitious domain method is a promising new DNS method for the particulate flows.

基于分布式拉格朗日乘子的虚拟区域方法是近年来出现的直接数值模拟粒子流的新方法之一。

To understand the difference, the second chapter calculates the run length distribution, its mean, and standard deviation by saddlepoint method and Laplace expansion, and compares the numerical results with the other methods.

为了研究该情况下〓图的性质，本文第二章应用鞍点展开和Laplace方法计算了链长分布及其均值和标准差，并与其他方法进行了数值比较。

Previous researches of pile group loaded laterally are carried out mainly by experimental and theoretical analysis.

随着计算技术和土的本构理论的发展以及微机性能的改善，数值分析方法逐渐成为一种应用广泛的研究方法。

In addition, an effective method is proposed to select the β-reducts. First, we calculate a precision parameter value to obtain the subsets of information system that are based on the least upper bound of the data misclassification error. Next, we measure the quality of classification and remove redundant attributes from each subset.

本论文也提出一个根据精确参数来选择最简化集合的方法，这方法首先利用资料错误率的最小上界来决定精确参数值，并利用所获得的精确参数值来寻找资讯系统的子集合；接著计算每一个子集合的分类品质并利用分类品质的量测移除子集合中多余的属性，而删除多余属性的子集合即β的最简化属性集合。

The temperature distribution and limit current were measured experimentally and the overall heat and mass transfer coefficients were determined. Furthermore, the comparison of numerical simulation with experimental measurement showed the good agreement.

本论文所实施的数值模拟方法和电化学实验模拟方法，为多孔介质双浮升力自然对流传热传质的研究提供了行之有效的途径。

The linear sampling method for the inverse scattering problem of acoustic waves is based on the fact that: a linear integral equation of first kind-far field equation including a parameter has an unbounded solution as the parameter approaches the scattering boundary from inside.

本文在此基础上就Dirichlet边界条件的声波反散射问题，利用积分方程理论严格证明了线性抽样方法对其的可用性，具体数值例子表明该方法是有效的。

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。