求解

MGM is introduced to solve field distributions in 3-D electron optical systems. The difference equation, the discrete form of Laplace's equation, is deduced in 3-D Cartesian coordinates. In view of the smooth effect, MGM combines Gauss-Seidel iteration with a technique known as coarse grid correction. Formulae for restriction and prolongation are deduced and expressed in terms of tensors.

将多重网格法引入电子光学系统中三维静电场的计算，对三维笛卡尔坐标系中的差分方程，采用高斯-赛德尔迭代法求解差分方程组，并结合迭代过程讨论了粗网格的误差校正技术；在不同网格层之间进行场值的限制和延拓，推导了三维静电场中的限制、延拓公式并以张量的形式表示。

The result shows that improved evolutionary programming is much more appropriate of none line model with a great volume of data.

结果表明对于数据量庞大的非线性模型的优化求解，改进后的进化规划算法具有更强和更广泛的适用性。

After nearly 40 years of development, the genetic algorithm in the theoretical study and practical application was a great success, this paper genetic algorithm for solving the course timetabling problem, first discussed the impact of factors in the course arrangement, the main constraints, to solve goals and difficulties, and a complete mathematical model to describe the course arrangement.

经过近40年的发展，遗传算法在理论研究和实际应用中取得了巨大的成功，本文将遗传算法用于排课问题的求解，首先讨论了排课问题中的影响因素、主要约束条件、求解目标和难点，并用数学模型完整地描述了排课问题。

So resolving this kind of problem efficiently has great research value in theory, and especially resolving those problems, such as resource allocation, job shop scheduling, timetabling, and routing, still has very important realism significance and commerce significance.

因而对该类问题的高效求解具有重大的理论研究价值，特别是像资源分配、生产调度、时间表和路由等问题的求解还具有及其重要的现实意义和商业意义。

So resolving this kind of problem efficiently has great research value in theory, and especially resolving those problems, such as resource allocation, job shop scheduling, timetabling, and routing, still has very important realism significance and commerce significance.

本文主要研究内容为基于约束的现代调度，即运用约束程序设计方法来求解现代调度问题，从而拓展了约束程序设计在求解组合优化问题方面的应用领域。

In this paper, the mechanisms of the generation, migration and production for coal seam gas are researched and the geological model for coal seam gas reservoir simulation is presented, according to the theories and methods of coal seam gas geology, petroleum geology and dynamic of fluids through porous media. A three-dimensional, dual-porosity, two-phase, pseudo-steady, non-equilibrium sorption mathematical model is established with the help of petroleum reservoir numerical simulation method. After that, this complex mathematical mode is approximated and solved by finite-difference and fully implicit methods. Coal Seam Gas Reservoir Simulation software in 1. 0 version (CSGRS 1. 0) with Chinese interface of pre-and post-processing function is developed.

本文应用煤层气地质学、石油天然气地质学和渗流力学等学科的理论和方法，研究了煤储层中煤层气的生成、储集、运移和产出机理，概化出了煤层气储层模拟的地质模型；以油气藏数值模拟和数值计算方法为工具，建立了描述三维、双孔隙、非平衡吸附、拟稳态条件下气-水两相流体混相运移规律的煤层气储层模拟的数学模型；详细推导出了该数学模型的全隐式求解方法；并借助计算机技术开发了具有中文操作界面的煤层气储层数值模拟软件CSGRS 1.0，实现了这一复杂数学模型的数值求解。

The calculations for a typical three\|layer wall are conducted to obtain the dynamic dist...

利用该方法对典型的三层墙体层与层界面处相对湿度在24小时内的变化进行了计算，计算结果与文[6]的传递函数求解方法符合很好，可推广应用到对二维和三维耦合传热传湿问题的求解。

According to the two methods mentioned above, the thesis makes a numerical model with the Equivalent Boundary Element method under the cylindrical coordinates.

，进而确立了柱体坐标系下一种耦合数值求解模型一等效边界元法数值模型，从而大大提高了求解效率和精度。

During the lateral parabolic profile was computed,numerical methods of calculating angle of inclination on initial point of the lateral paracurve and calculating angle of inclination based on interval length were analyzed.It is pointed out that the key of the lateral parabolic profile design is a circular function equation which can be applied to solving the angle of inclination on initial point of the lateral paracurve.

对侧位抛物线剖面设计求解过程中的求侧位抛物线初始点井斜角的数值方法和从段长求井斜角的数值方法进行了分析，指出其关键是求解侧位抛物线初始点井斜角所满足的一个三角函数方程。

This dissertation sets up a physical model consists of the caudal fin, the muscles and the spring, and also gives a mathematical model of the optimal compliance of the spring. Some simulations are carried out. The simulation results says that the elastic element can increase the propulsion efficiency, which provides a technical way for promoting efficiency of underwater propulsors.

本文给出了一种含有弹性元件的肌肉—弹性元件—尾鳍的物理模型，在游动能量损耗最低条件下，建立了求解弹性元件最佳柔顺系数的数学求解模型，并进行了仿真研究，研究结果验证了弹性元件对提高推进效率的作用，为提高仿鱼水下推进器的推进效率提供了一种技术上的解决途径。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。