数值计算

The basic equations of centrifugal pump on steady and unsteady process were educed based on theory of momentum and moment in order to analyze the transient hydrodynamic performance of centrifugal pump. The equations were used to describe the influence of accelerating rotation of impeller and accelerating motion of fluid on hydrodynamic performance.

为了对离心泵快速开启过程的瞬态效应进行分析，根据动量矩定理分别推导转速稳定和不稳定时的离心式水泵基本方程式，给出了叶轮旋转加速和流体加速对性能影响的数学描述方程，为进一步理论分析和数值计算打下基础，并结合一台快速启动的混流泵进行实例分析。

Monte Carlo method can effectively solve complex engineering problems, and MATLAB has powerful function of numerical calculation.

蒙特卡罗方法可以有效地解决复杂的工程问题，而MATLAB具有强大的数值计算功能。

Euler method, single step method and one-leg multistep method are considered as maily numerical computation schemes.

本文分别采用显式Euler法，单步θ-方法和one-leg方法作为数值计算格式。

By the numerical calculation, the effects of gain narrowing and gain saturation were analyzed and discussed.

通过数值计算，分析和讨论了啁啾脉冲传输的增益窄化和增益饱和效应。

This paper deals with the partial capacitance calculation of the high voltage transmission line for the neutral beam injectors.

该文研究了中性束注入系统中高压传输线部分电容的求解问题；根据传输线多层同轴导电壳的结构特点，利用多重镜像法确定与平行导线相应的一系列的镜像线电荷，求解的问题变为由一系列平行线电荷构成的电场问题，传输线的部分电容则通过各导体间的电位系数来求得；这一方法避免了直接求解的困难以及大量数值计算等问题。

In order to find out the biomechanics feature of three joints muscles o f lower limbs by using new skates in push-off phase of speed skating, this article combines the kinetic data obtained by Cybex-Norm and kinematic data obtained by tridimensional analytics by employing the Newton interpolation polynomial f or the first time, draws the curve of muscles moment of two elite female speed- skaters in push-off phase of speed skating, and analyzes the change feature of muscle strength, so as to find out the reasons of less power output and provide reference for training and the improvement of sports results.

摘 要：为了找出使用新冰刀后蹬冰时下肢三关节肌群的生物力学特性，首次利用数值计算中的牛顿插值法，将等动测试获得的动力学数据和三维立体解析获得的运动学数据结合，绘出两名优秀女子速滑运动员实际蹬冰时肌群力矩的变化曲线，并分析肌力变化特点，找出两人做功明显不足的原因，为指导训练和提高运动成绩提供定量依据。

Data structure is an important curriculum for algorithm designing and training in the university. The aim is to develop the student's algorithm designing and programming ability by discussing computer operating objective and the relation between them and operations in the non-numeric problem.

数据结构是高等学校一门重要的算法设计训练课程，旨在通过研究非数值计算的程序设计问题中计算机操作对象以及他们之间的关系和操作等相关问题，提高学生的算法设计和程序设计能力。

The orthogonal qs-coherent state is constructed and its nonclassical properties such as squeezing property, antibunching effect are studied.

构造了正交 qs相干态，并研究了它的压缩性质、反聚束效应等非经典性质。数值计算了形变参数 q和s对非经典性质的影

Results of numerical calculation indicate that the present method is of high accuracy, agrees well with available closed\|form solutions, and is capable of dealing readily with the friction between wall and soil, nonhomogeneity of backfills and complex load...

数值计算结果表明，本文方法精度高，与现有的解析解一致；且可方便地考虑挡墙面的摩擦作用、土体的不均匀分布以及复杂的外载组合，值得推广应用于工程设计。

In order to simulate the mechanical behavior of nonhomogeneous materials numerically, the traditional finite element method is improved in this dissertation and the finite element method with nonhomogeneous elements is developed.

为了适用于非均匀材料的数值计算，本文将传统的有限元方法进行了改进，推导了非均匀单元有限元方法。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新