数学模型

The field survey, sampling, testing and collection of the geological and hydrogeological data were done for the description of evolutional geological structure and sedimentation and division and definition of water-bearing system and hydrogeological age and hydro-pressure system and study of the vadose field and chemical field. By establishing the rammer numerical model, the sandy mudstone thickness recovery model, water-rock interaction particle translative simulation and hydrogeochemical simulation, and using geological statistics, analogism and complex analysis method, water circulation and water exchange of each layer in each study stage have been researched, The results show the regularity of the vadose field evolution in different stages.

本项以野外调查、采样测试和搜集的地质、水文地质大量第一性资料为依据，在论述盆地的地质构造演化、沉积演化的基础上，以含水系统、水文地质期和水压系统类型的划分和定位为研究的切入点，渗流场、化学场为研究主线，通过建立压实数学模型、砂泥岩恢复厚度数学模型、水岩作用物质成分转移的实验模拟、水文地球化学模拟、地质统计法、类比法、综合分析法等方法，模拟计算了各研究层在各研究时期水循环特点和水交替强度，揭示了各研究层渗流场在地史进程中形成演化的规律性。

Permanent magnet synchronous motor driven by triphase sinusoidal current is research object in this paper. On the basis of analysis of the structure, movement principle and math model of PMSM, Fundamental theories and structure of the system of PMSM alternating current servo systems based on DTC are discussed. Then Simulation models of traditional PMSM DTC and PMSM DTC based on vectors subdivision are established separately.

本文以三相正弦波驱动的永磁同步电机为研究对象，在分析永磁同步电机结构及数学模型的基础上，系统阐述了基于直接转矩控制的永磁同步电机交流伺服系统的基本原理和系统构成，并在MATLAB仿真环境下分别建立了传统直接转矩控制和基于矢量细分算法的直接转矩控制系统的仿真模型。

Application shows that it is not necessary to struct the mathematical model when it is used to process geological data. It can express the relashionship among the various variables by its "hidden" forms and handle the unexact and fuzzy data in relative area.It has advanced exactness and speed comparing with other methods.

试验结果表明，用该模型进行地质数据的多变量分析，不用考虑数学模型，神经网络就能以&隐式&表达方式表示出各变量间的关系，对于具有不确定性和模糊性的地质数据，有良好的分析和处理能力，而且精度和速度都比较理想。

In addition to,the implicit camera system model is made with BP neural network simulating the relationship between the 3D objects and its images in the stereo system,which avoiding the system errors caused by unperfected mathematic relation.

又运用BP神经网络来模拟立体视觉系统三维空间与二维图像平面之间的物、像对应关系，建立了双目立体视觉系统的摄像机隐式标定模型，避免了因数学模型的不完善而带来的系统误差。

Calculated flux distribution of the upfeed system in the household hot water heating.

介绍了分户式热水供暖系统的水力工况原理，通过分析分户供暖系统的水力特点，应用不等温降的管网水力平差的计算方法，建立了分户供暖管网系统水力分析的数学模型，并应用该模型对工程中习惯采用的下供下回式分户热水供暖系统进行了分析，编制了水力分析软件。

Introduced the principles of hydrodynamics in the household hot water heating system,Analyzed characteristics of hydrodynamics in the household hot water heating system,using unequal temperature reduction hydraulic balance method,established hydraulic analysis mathematics model for household hot water heating system.Using the model analyzed the upfeed system of household hot water heating in engineering.

介绍了分户式热水供暖系统的水力工况原理，通过分析分户供暖系统的水力特点，应用不等温降的管网水力平差的计算方法，建立了分户供暖管网系统水力分析的数学模型，并应用该模型对工程中习惯采用的下供下回式分户热水供暖系统进行了分析，编制了水力分析软件。

And a software is provided for simulation management of the ladle in continuous casting process too.

还根据该数学模型开发出监控和予报钢包内钢水温度的在线模型和连铸工艺过程钢包仿真管理软件。

Three steps, the establishment of distribution modes, equilibrium analysis and simulation comparing, are displayed in the paper and at last the conclusion is deduced that when enterprises set down policies for distribution modes of output, they should link the earning of subject with his effort level in order to get better bestirring effect.

文章首先建立了数学模型，在动态情景下模拟产出分配方式对主体选择和主体规模的影响，分析了在不同的分配方式下，主体均衡努力水平的差异，以便为企业分配方式改革、激励机制完善提供理论指导；通过模型建立、均衡分析和模拟比较3个步骤，得出在制定产出分配政策时，把主体的收入与自身的努力水平挂钩，可以得到更好的激励效果的结论。

A new mathematical model for describing polymer flooding mechanism was developed. This model can be used to simulate the multi-polymer commixing flooding and polymer viscouselasticity process.

建立了能模拟多种分子量聚合物溶液混合驱油和聚合物黏弹性作用驱油机理的数学模型，该模型从弹性效应和黏性效应两个方面描述了聚合物驱油机理。

The writer conceptualizes the hydrogeol ogical model, and the corresponding three dimension mathematical model has been built,the Finite Difference Method is used to solve the mathematical model. After calibration and verification of the model, the adopted geology parameters basically accord with the concrete hydrology geology condition.

模型校正结果表明所建立的数学模型具有较好的拟合程度，所确定的地质参数基本符合本地区的具体水文地质条件，可以用于本区地下水资源评价。

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。