数学模型

The main theme of this thesis is to seek strategies and waysfor the survival of Yantai Port in the competition and for its sustainabledevelopment, The thesis is composed of seven parts:Part One: IntroductionPart Two: Port development strategies and the significance ofresearchingPart Three: Analysis of Yantai Port" external environment Part Four: Analysis of Yantai Port"s internal environment Part Five: Analysis of transportation demands in Yantai Port Part Six: Development strategies for Yantai Port Part Seven: Major problems and policies related to thedevelopment of Yantai PortThrough analysis and prognosticating of equipments, stuff, organization and the external and internal environments of Yantai Port, we forecast the demands of transportation of Yantai Port.

文章分七部分：一、前言：二、港口发展战略及其研究意义；三、烟台港外部环境分析；四、烟台港内部环境分析；五、烟台港港口运输需求分析预测；六、烟台港港口发展战略规划；七、烟台港港口发展的主要问题及应采取的对策及建议。本文首先对烟台港务局港口设施和设备、组织机构、人员结构等资源及面临的内、外部环境进行了综合分析。在此基础上，利用近十年的统计资料，赁借线性回归等数学工具建立数学模型进行港口运输需求分析预测。

According to forming mathematic model, the tenons were depicted in mathematics, and the cutting tracks were formed.

对铣削加工的榫形作了数学描述，并根据榫形的数学模型生成铣削时的刀具轨迹。

Assessable mathematical model of safety evacuation in subway station was proposed with combined principle of fuzzy mathematics and fuzzy hierarchy analysis process.

根据地铁站的火灾特点和安全疏散的影响因素建立了评估因素集，结合模糊数学原理和模糊层次分析法，建立了地铁站安全疏散评估数学模型。

A supercritical heat-supply unit with a double reheat employs steam extraction from a low-pressure turbine cylinder for supplying process heat.

针对二次再热超临界供热机组采用低压缸分缸抽汽供热的特点，利用等效热降理论，进行分析与数学推导，得出了该类型机组抽汽等效热降和抽汽效率的计算方法，形成该类型机组的经济性定量分析数学模型，从而将等效热降理论的应用范围拓展到二次再热供热机组。

After confirming the diagnostic flow for the diagnosis of the feed pump, a spot instance is brought forward in the thesis.

论文通过对模糊故障诊断技术及模糊数学理论的分析，提出了给水泵振动模糊故障诊断的数学模型。

Combining theoretical analysis with experimental demonstration,the mathematical models of the quadrant and the mechanical gravity- pendulum tilt sensor are built.

通过理论分析建立了象限仪读数和机械重力摆式倾斜传感器输出的数学模型，运用数学推导的方法描述了火炮耳轴倾斜随火炮纵倾的关系，从理论上阐明了用象限仪标定炮耳轴倾斜传感器产生误差的原因及其量值，通过试验进行了验证，并提出了解决方法。

Through the analysis of the work principle of three phases voltage resource PWM converter, set up the low and high mathematic models, deduce the restriction equations about grid voltage, grid current, modulation voltage and the DC output voltage and the calculation equations of the AC-side inductance and the DC-side capacitance. There are two control strategies are adopted: Predicted current control strategy and voltage-current two closed-loop control strategy, and give a comparison by theory and practice.

通过分析三相电压源型PWM变换器的工作原理，分别分析了低频和高频数学模型，并推导出了交流侧电压电流、调制电压、直流侧电压之间的数学约束关系以及交流侧电感和直流支撑电容参数的选取依据公式；分析对比了两种控制策略：预测电流控制和电压电流双闭环控制并加以实验验证；同时采用了负载电流前馈补偿和本文提出的一种基于专家系统的神经元新型智能PI控制器两种方法大大提高了整个系统的动态响应性能，并在仿真和实验中加以验证，这也是本文研究的重点内容之一。

We begun with the model of the milk production,mat- thematically derived,following the herdmate comparison rule,the basic formula of Contemporary Comparison Method from the model; then discussed the development of Contemporary Comparison Method acc- ording to the condition in practical breeding;finally,pointed out the imperfects of Modified ...

首先从产奶量的数学模型开始，遵照同群对比的原则，用数学理论导出了这个方法的重要公式 C；然后，根据实际育种状况讨论了这个方法的发展过程；最后，指出了修正后的同群同龄比较法仍然存在的某些问题。并提到了从理论上讲可以避免这些问题的 BLUP 育种值估计法。

This paper studies the mathematical simulation of the "properties-temperature" curve of ductile-brittle transition process for materials and finds the best mathematical model of ductile-brittle transition.

研究了Cr24Al2Si铁素体不锈钢韧脆转移过程的性能-温度曲线的数学模拟，找到了其最佳的韧脆转移数学模型。

is first been used to describe the gap and root face of welding seam which is the important feature sizes and the welding current which is the most important controlling parameters MIG welding penetration and the welding time in quantity and the fuzzy math.

依据这一特征，应用模糊数学的方法对焊缝的重要特征尺寸间隙和纯边、MIG焊熔透的重要控制参量焊接电流以及焊接时间给予定量描述，并建立了视觉弧焊机器人焊接参数自动规划模糊数学模型。

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。