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The properties of a rotationally symmetric parabolic X-ray lens are studied theoretically and numerically in this paper.

本文给出了旋转轴对称抛物面型X射线组合透镜的理论研究成果。

Combining with carrier rate equation,the fine structure of output spectrum and output power are numerically simulated.

结合载流子速率方程，对外腔半导体激光器的输出谱的精细结构以及P-I 特性进行了数值模拟研究。

The characteristics of this type motor are then calculated numerically and discussed with the aid of this equivalent circuit.

利用该等效电路对电机的运行性能进行了分析和数值计算。

The unsteady flow and heat transfer in pressure wave refrigerator is investigated numerically in the present paper. The Godunov scheme and control volume method are used to solve the 1D Euler integral equations and heat transfer equation respectively.

建立了振荡管内非定常流动与传热的数学模型，分别采用Godunov格式和控制容积法对气动方程及传热方程进行离散，得到了管内压力波形、气流速度及温度随时间的变化历程。

The governing equation with chemical reacting flow is established. Using time splitting algorithm, the convection term is solved with the second-order Godunov method and the chemical reaction is coped with two-step model. Standing oblique detonation waves induced by an accelerating projectile are simulated numerically. The results are compared well with the data of the experiments.

建立了含化学反应流体流动的数值模拟模型，用时间分裂法对对流项和化学反应项分别采用高阶Godunov格式和两步反应模型进行处理，对锥形斜爆轰波和驻定在飞行弹丸上的斜爆轰波流场进行了数值模拟，得到了与实验现象相吻合的计算结果。

Secondly, to solve some important nonlinear wave equations numerically, we establish various rational orthogonal systems with the Legendre weight.

其次，针对一些波动方程，我们构造了一些不带权正交的有理函数空间，并建立了相应的逼近理论。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。