结构方程

In conclusion, all our results further enrich, develop and perfect the theoretical system of the algebraic multigrid method.

代数多重网格方法是根据一般多重网格方法的原理建立起来的一种自动求解线性代数方程组的快速算法，它采用分层思想通过一种纯代数的多水平方法处理矩阵方程，特别是二维或三维大规模无结构方程组。

For accelerating this problem's compute time in parallel computer, we use Saul'yev type asymmetric different scheme and classicality explicit-implicit type to get a new alternating group explicit method for solving diffusion equation.

为便于在并行计算机上计算以加快计算速度，现将第二类saul'yev非对称格式以及古典显、隐式相结合，构造了求解扩散方程的一类交替分组显格式，其基本结构为四点组，并针对内点为偶数的情况，在节点两端点处进行了处理，以提高精度。

A damage identification method based on axial vibration was presented on the basis of theoretical derivation axial vibration differential equation and analytical solution of three kinds of support form.

在理论上推导悬臂梁轴向振动微分方程及其3 种支座形式的解析解的基础上，提出了一种基于轴向振动的结构损伤识别方法。

Through the analytical solutions of momentum differential equation for a stream with varying mass, a general characteristic parameter , depending on structure scale and flow parameter, is introduced.

在径向流体分布器的变质量动量方程理论模型的基础上，通过对模型解析解的分析，获得了包括径向分布器结构尺寸和流动参数的特征参数k／C。

For the radiation transfer equation, both the spatial domain and the angular domain is discretized, and the finite volume method is used to solve the equation in an explicit way.

把一种新的三维热辐射计算方法应用到高超声速非平衡流场的数值模拟过程中：在非结构网格上对高超声速化学非平衡流场的数值模拟过程中，耦合了辐射输运方程来求解辐射热流。

A calculation model for the analysis of portable point and area antipersonnel weapon structures is presented. Relevant dynamic equations are put forward.

摘 要：提出了一种适于手持式面杀伤组合武器结构的分析计算模型，建立了相应的动力学方程。

According to the change of the enemy\'s quantity and the qualitative theory of the differential equation, we research the spruce aphides and its predator system. At the same time, we discussion the spruce aphid multiplication model when the natural enemy quantity is a certain value and the periodic oscillating model whose the quantity of the natural enemy changes along with the time. Obtains the stability condition of the balance point and the limit-cycle existing condition, the system presents the dissipative structure\'s character. Finally it explains that this theoretical analysis has certain practical significance regarding the preventing and controlling harmful insect.

第五章，松毛虫与其天敌的关系是食饵和捕食者的关系，根据天敌数量的变化，利用微分方程定性理论，研究松毛虫与天敌系统，讨论天敌数量为一定时的松毛虫增殖模型和天敌数量随时间变化的周期振荡模型，得到正平衡点全局稳定性和极限环的存在条件，通过计算机模拟，说明周期振荡的捕食模型能够呈现典型的时间耗散结构特征，对于防治害虫有一定的实际意义。

Based on the equation of the model, the acceleration, displacement and story shear of a seven- story building with a three-story appurtenant structure under three control systems including only rubber-bearing base, rubber-bearing and damper and no rubber-bearing are computed under the earthquake record of 1940 EI- Centrol, respectively.

根据控制系统方程，在无橡胶垫、仅设橡胶垫和同时布置橡胶垫和阻尼器的三种工况下，运用1940EI-Centrol加速度波，对具有三层裙房的七层建筑结构进行了分析，得到了七层建筑的加速度、位移和楼层剪力等参数。

That the coefficient matrix of the reduced linear correction equation has arrow-shaped block structure and can be accurately decomposed into 25 sets of low-dimension linear equations by two algorithms was proposed.

该文指出其修正方程系数矩阵可具有箭形分块结构，可采用两种方法将其精确解耦为25个低维线性方程组。

At the same time, the ballistic limit curves of the Whipple shield in a velocity range from 0.5 km/s to 5.5 km/s was obtained. Comparing to the predicted curve from Christiansen ballistic limit equation, the experimental minimum critical projectile diameter is slightly greater than the prediction.

通过固定弹丸直径，改变弹丸撞击速度，寻找临界撞击速度的方法获得了铝合金Whipple防护结构在0.5～5.5 km/s撞击速度区间内的撞击极限曲线，并与由Christiansen撞击极限方程得到的撞击极限曲线进行了比较，结果表明，实验最小临界弹丸直径略大于预测值。

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。