查询词典 theory model

A mathemetical model of magnetic field in electromagnetic separation of inclusions from molten aluminum under rectangle coil and 50Hz current is presented according to the magnetic vector potential integral equation and the basic theory of magnetohydrodynamics. The magnetic field distribution in the gap of coils is simulated by the model and the actual magnetic field distribution also is measured. The experimental results show that the magnetic field distribution in the gap of coils is uniform and is consistemt with the model simulation. The magnetic field designed accord the simulated result is proved suitable in the practice.

摘 要：根据电磁流体力学的基本理论，利用矢量磁位积分，建立了在采用矩形电磁线圈和工频电源的条件下电磁分离铝熔体中夹杂的电磁场数学模型，模拟计算了电磁感应线圈气隙中的磁场分布状态，同时对制做的感应线圈的实际磁场进行了测量模拟计算磁场的分布状态与实际磁场的测量结果基本一致，都表明在电磁感应线圈气隙中磁场分布均匀，可以进行分离铝熔体中的非金属夹杂。

While library resource sharing is shifting to the new networking environment era, it is also in face of a lot of new challenges and"Access versus Assets"is becoming the new theme of the resource sharing in this new networking era, based on this point this thesis studies the development and the transformation of the resource sharing both in practice and in theory in the networking environment, particularly focus on a serial of issues, including the construction of resource sharing system, digital information resource, digital library, interlibrary loan, document delivery service and collection development etc. The writer also analyzes the coexsitence of the traditional resource sharing and modernizational resource sharing and the relationship between them in 21st, explores the revolutionary changes of resource sharing as the"Assets"model is driving to the"Access"model, discusses the development of specific collection for a single library and how to construct a seamless integrated information resource system in the networking environment, systematically studies and introduces the new organization model of resource sharing, especially emphases that document delivery is the key of the success in resource sharing, and finally tries to outline the main trends which will influence resource sharing.

本文立足于网络环境下资源共享的新主题：存取与拥有，研究和分析了网络环境下资源共享及其体系建设，包括电子信息资源、数字图书馆建设、馆际互借、文献传递服务、文献资源建设等几方面在理论和实践中的发展和变革；论述了21世纪初网络环境下传统型和现代型两种层次并存的资源共享；探讨了文献资源建设从"拥有"模式到"存取"模式的重大转变、特色馆藏建设和无缝一体的网络信息资源体系的建设途径；较为全面、系统地研究和介绍了网络环境下资源共享的新型组织模式的形成及其特点；强调了文献传递是实现资源共享的关键；并试图准确把握网络环境下资源共享研究和实践的发展趋势。

Using LaGrange theorem on base of analyzing the elastic prop model tension system of band saw machine, the dynamics model of elastic prop tension system of band saw machine has been established and converted to mathematics model applying the modern control theory.

本文以MJ317型木工杠杆压砣张紧系统的带锯机改造成弹性挺杆张紧系统的带锯机为研究对象，通过对带锯机弹性挺杆式张紧系统的弹性动力学分析，运用拉格朗日定理建立了张紧系统的动力学模型，并应用现代控制理论将模型转换成数学模型。

Orienting directed from the theory of "interbed" put forward by Leake, based on the Terzaghi\'s effective stress principle, the principle of coupling groundwater flow equation and soil deformation equation is analyzed in this paper. And the land subsidence model coupled by three dimensional groundwater flow model and one dimensional soil deformation model was built.

本文从Leake提出的含水层内的"夹层"理论出发，在Terzaghi有效应力原理的基础上，分析了地下水流方程和土体变形方程耦合的机理，建立了由三维地下水流模型和垂向一维土体变形模型耦合得到的地面沉降模型。

Firstly, a hybrid system about the start-up process of a leatheroid's DMF recovering plant has been studied, the hierarchical control model of this system was built using timed Petri nets and hybrid Petri nets theory. The monitoring method of start-up process was discussed by studying the coordination layer of this model, and the reachability method was adapted to analyze this model.

论文首先对混杂系统——人造革DMF回收开车过程进行了研究，结合赋时Petri网和混合Petri网建立了其递阶控制模型；通过对其协调层的深入讨论，研究了开车过程的监控问题，采用可达性等方法对模型进行了分析。

To study the limit behavior of computations, the procedure scheme (Li, 1992, 1999) is generalized to model convergent infinite computations for analyzing how an infinite computation interacts and evolves in changing environments and what the limit of the evolution might be. The model is based on classical computation model Turing machine and Li's limit theory of sequences of formal systems.

收敛无穷计算的模型过程模式：本文将李未提出的过程模式推广为更一般的刻画收敛无穷计算的模型，该模型是基于经典计算模型Turing机和形式系统序列及其极限的理论的，可以用过程模式刻画网络上长期运行程序的计算特性与动态行为。

A synthetic model of multi-level production planning and control integration is brought forward, which integrated Master Production Schedule , Material Requirements Planning , Shop Floor Control , order acceptance control, order release control and process control into a whole. Besides, a new method of production management—— Theory of Constraints is introduced into the traditional MRP, and a method to integrate TOC with MRP is put forward. As a result, a system of production planning management for ceramics enterprise is developed. Then several problems of shop planning and control for ceramics enterprise including the modeling of production line, the optimized utilization of kiln, the complement and due-date of products are discussed. A mathematical programming model of equalization production for ceramics production line is set up. An optimized model is put forward, which uses genetic algorithm to solve the sequencing problem of ceramics before the kiln.

以生产计划与控制的集成为目标，提出将一个企业中的主生产计划、物料需求计划、车间作业计划与接受订单控制、投料控制与生产控制集成的多级生产计划与控制的总体模型，将一种新的生产管理方法——约束理论引入传统的MRP中，提出了实现TOC和MRP集成的具体方法；针对陶瓷企业的特点，为重庆兆瓷研制了一套陶瓷企业生产计划管理系统；并对陶瓷企业车间计划与控制中的一些具体问题进行了研究，建立了陶瓷生产线均衡生产的数学规划模型，就窑炉的优化利用、产品配套和交货期问题、陶瓷生产线的能力平衡等问题进行了研究。

The mathematics model , physics model and geometrical model for numerical simulation about microbus temperature field is built based on the microbus s thermal translating and substance translating theory .

结合微型面包车的传热与传质机理以及SC6350车型，建立了温度场仿真的数学模型、物理模型和几何模型。

The modeling theory and methods of structure model, facies model and property model are introduced in the paper, then their advantages and disadvantages are analyzed, and the new method, multiple point statistics, is mentioned here.

文中介绍了构造模型、相模型和属性参数模型常用的建模方法原理，分析其优缺点，并对多点统计的新方法进行了描述。

The modeling theory and methods of structure model ,facies model and property model are introduced in the paper,then their advantages and disadvantages are analyzed,and the new method,multiple point statistics,is menti.

文中介绍了构造模型、相模型和属性参数模型常用的建模方法原理，分析其优缺点，并对多点统计的新方法进行了描述。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。