离散数学

In the scheduling layer, we discussed such papermaking workshop which has stochastic demand and failure. Mathematical model is setup. This problem are inverted into discrete dynamic programming.

在调度层针对具有随机需求和纸机故障的造纸车间，建立了数学模型，并利用一致化转移方法将其转化为离散动态规划问题。

This paper introduces the food refrigerated theory and the basis of the current industry refrigerated developments in the situation; And then in the long cylindrical-shaped food heat conduction process and the mathematical model using the method of differential thermal conduction equations for discrete, Programming come through long cylindrical-shaped food cooling process numerical solution; After further analysis of numerical solution of the test results; Finally, the impact of the cooling process food all relevant factors, such as moisture content, wind speed and temperature of the cooling medium for in-depth research, while comparing the different shapes of food to food cooling process.

本文首先介绍了有关食品冷冻冷藏的基础理论和目前冷冻冷藏行业的发展的发展概况；然后研究了长圆柱状食品热传导过程的数学模型并利用差分的方法对热传导方程进行离散，通过编程得出长圆柱状食品冷却过程的数值解；之后再分析解对数值解的结果进行验证；最后对影响食品冷却过程的各相关因素，如含水率、风速和冷却介质温度等进行了深入的研究，同时又对比了不同形状的食品对食品冷却过程的影响。

We will utilize tabu search and simulated annealing to determine the discrete decisions. Then, by using the discrete decisions, a mathematical programming model, proposed herein, will be used to solve the continuous decisions.

求解方法为先利用塔布搜寻法或模拟退火法找出离散决策，再带入一个以最小化总存货成本为目标的数学规划模式，以求解出连续决策的值与目标函数值。

This paper introduces the common solutions to convolution integral of discrete causal series and further proposes a simpli solution using the knowledge of elementary mathematics.

本文介绍了在离散因果序列卷积和的求解中的常用解法，在此基础上应用初等数学的知识介绍了一种简便解法。

Taking discrete Fourier series and Fourier Transform of periodic sequence as an example,this paper expounds how to simplify those abstruse theory by using straightforward mathematical knowledge which students are well-informed.

本文以周期序列的离散傅立叶级数和傅立叶变换的推导为例，就教师如何用简单的或学生所熟悉的数学知识，进行深入浅出的教学进行了探讨。

Indicating the main characteristics of production technology in mail process center. Knowing in detail of the computer model and simulation method of discrete event system; investigation of computer simulation software; comparison and analysis the advantage and disdvantage of the simulation software. Modeling and simulating the package sorting production line in Xinjiang Newspapers and Periodicals Emitting Office and analyzing the simulation result. Modeling and simulating the hanging sorting -production line in Urmqi Mail Processing Center and analyzing the simulationresultProposes a simulation design method for the mail center auto product line, and made a simulation design for package emitting auto product line in Xinjiang Newspapers and Periodicals Emitting Office. Modeling a mathematical model and simulate for the construction of the sorting table of package sorting machine, and proposes a scheme of discriminatingly setting the buffers of sorting table.

本文的主要工作如下：针对邮政业务，特别是邮件处理中心的邮政业务作详细的调查分析，指出邮件处理中心生产工艺的主要特征；通过详细的了解离散事件系统计算机仿真技术的研究方法，并对计算机仿真软件作了周密的调查，借鉴、分析比较其功能特性的优缺点后，根据实际情况选购了本论文所需的仿真软件工具；对报刊发行局包件分拣生产线作计算机建模和仿真，将仿真结果作分析总结；对邮件处理中心转运中心的推推分拣生产线作计算机建模和仿真，得到仿真结果并作总结分析；提出邮件处理中心自动生产线的仿真设计方法，对报刊发行局期刊发行自动化生产线作仿真设计；最后对包件分拣机上包台结构建立数学模型和计算机仿真，提出多级上包台区别设置缓冲区的方案。

This paper is devoted to solving linear saddle point problems, Specifically, We consider nonsymmetric systems, written as usual in block form, where the upper left block is an invertible linear operator with positive definite symmetric part. Such saddle point problems arise, for example, in certain finite element and finite difference discretizations of NavierStokes equations, Oseen equations, and mixed finite element discretization of second order convection-diffusion problems.

中文题名求解鞍点问题的迭代方法副题名外文题名论文作者冯丽红导师曹志浩教授学科专业计算数学研究领域\研究方向学位级别博士学位授予单位复旦大学学位授予日期2002 论文页码总数87页关键词鞍点问题迭代方法网格离散线性方程组馆藏号BSLW /2003 /O241 /15 论文针对鞍点问题的求解分析了一些典型的快速算法。

Firstly, according to electromagnetic field theory, the 2-dimensional (2-D) mathematical model of a three phase squirrel-cage Y802-2 induction motor is developed. Then general equations can be deduced from finite element discrete and functional analysis. The motor's 2D solving region of electromagnetic field is given based on the boundary conditions and assumption conditions of the squirrel-cage induction motor. Through finite element mothod and inner–outer convergence method, magnetic field distributions and magnetic forces of bars can be calculated in following rotor conditions: health rotor, one single broken bar, two adjacent broken bars, two broken bars with one good interval, two broken bars with two good interval and four adjacent broken bars.

本文首先根据电磁场理论建立Y802-2型三相笼型感应电动机二维电磁场的数学模型，并对其进行了有限元离散以及泛函分析，推导出总体方程；在基本假设和边界条件基础上，给出笼型感应电动机二维电磁场的求解区域，然后应用有限元并结合内外双收敛方法，对样机稳态运行进行数值计算，得出电机在转子完好、一根导条断裂、连续两根导条断裂、间隔一根两根导条断裂、间隔两根两根导条断裂及连续四根导条断裂六种情况下的磁场分布和导条所受电磁力的变化情况。

Methods in discrete mathematics, such as finite difference equation, simulation, coding, etc. The related cases are "Mortgage loan and other financial problems","Simulation of inventory problem","Adding cipher and extricating for Hill code", and "Input-output analysis".

某些离散问题的数学方法(差分方程问题，仿真方法，密码学等)，这部分内容相应的教学案例是"个人住房抵押贷款与其他金融问题"，"库存问题的仿真方法"，"Hill密码的加密、解密和破译"和"投入产出分析"等

With the Consideration of capillary pressure and its hysteresis effect, the finite element equation with semidiscretized method is deduced.

本文用半离散的方法对数学模型进行了有限元方程推导，并在数值模型中考虑了毛管压力的作用以及其滞后效应。

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。