离散数学

In chapter 7, quality loss cost is first used in the model of simultaneous design of tolerance, and economically attainable accuracy of position is first considered as constraint condition. It is first proven that the function of simultaneous design of tolerance is non-convex program; discrete and continuos Simulated Annealing are introduced; the optimum software to solve this model is given.

第七章首次将质量损失成本用于公差并行设计的优化数学模型中，并首次考虑位置精度的经济加工精度范围作为约束条件；论证了公差并行设计优化模型的非凸规划问题；着重介绍了离散型和连续型的模拟退火算法SA；研制了公差并行设计的优化软件。

The main goal of this presentation is to give a theoretical explanation and a mathematical model for computer simulation of mandalas, based on the mechanisms of biochemical reactions in a human brain and on discrete chaotic dynamics.

这个陈述的主要目的是要给出一种理论上的解释和建立一个计算机曼荼罗仿真数学模型，基于人脑的生物化学反应机制和基于在离散、混乱动力学之上。

The optimization design problem of reducing planet gear box in big power inverted umbrella aeration machine has been solved.

本文通过对遗传算法的研究，构造了大功率倒伞曝气机行星减速齿轮箱的数学模型，通过编码的方法对其轮系的离散变量、整型变量进行了寻优设计，解决了大功率倒伞曝气机行星齿轮优化设计的问

Aimed at the shaking problem at the moment of high speed paper feeding by paper separation suction nozzle of feeder of the press, a set of inverse seeking designing method for the suction nozzle of paper separation mechanism was provided.

针对印刷机飞达分纸吸嘴高速输纸时的抖动问题，提供了一套分纸吸嘴机构反求设计的方法。根据实测凸轮廓线离散坐标，利用样条插值法得到了实际廓线的解析方程；构建了分纸机构运动反求的数学模型，得到了从动件及分纸吸嘴的运动规律。

A new simplified mathematical model has been established based on the balance of total energy with radiative heat transfer equation solved by discrete ordinates method.

采用数值模拟的方法，在进行合理简化后，建立总能量平衡基础上的炉内热过程数学模型，其中辐射传递方程的求解采用离散坐标法。

By means of the plating technology and the system designed and made ourselves, we call them as the direct-heat evaporating roll-pulled with vacuum piston and the helix evaporating of straight heat-wire with the negative thermal specific resistance , the align polishing ring films and the separating ones of pure gold have been plated directly at the inner wall of the capillary of Sealed-off CO〓 laser.

简便有效地使器件的输出功率、光束品质、稳定性和使用寿命都得以提高的作用效果；分析了放电驱动催化机理及催化效果与器件参数、工作状态及其中的等离子体过程的对应关系，建立了数学模型，编程数值计算了放电管内正柱区中等离子体参数分布及其与器件工作外参数的关系；利用我们设计开发的直热式真空活塞卷拖和负阻直热丝螺旋蒸镀工艺及制作的系统，在封离型CO〓激光器毛细管玻璃内壁上直接镀制出了单质金的镜面环膜和离散膜，经理论分析和实验检验，指出美国专利4756000号的环金方案将导致器件工作特性的改变和恶化，降低效率；肯定了正柱区边界部分场对建立良好的激光振荡的作用意义，明确提出了①作为高品质器件设计基础的弥散膜催化剂；②高斯管型弦驻波振动定型磨制、检测的新概念及相应的制备加工工艺；实际制出了管子，测定了其基本的工作特性和初期过程。

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。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。