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In this paper, using the method of computer simulation, on the basis of the cone bit geometry and inematics models and the interaction model of bit and rock, the established models are solved through the MATALB programming.

利用计算机仿真方法，在已建立的牙轮钻头几何学、运动学模型和钻头与岩石互作用模型的基础上，通过MATLAB 编程，求解所建立的各模型。

The article incorporates Huygens principle with existing fire behavior models of surface fire spread,crown fire spread,fire acceleration,builds forest fire simulation models which fit to Anning s terrain,and develops related dynamic modules for Yunnan Province.

利用惠更斯原理进行林火蔓延模拟，结合国际上成熟的林火行为模型(Rothermel的地表火模型，Van Wagner的树冠火蔓延模型，McAlpine的林火加速模型)，建立适合云南省特殊地形的林火蔓延动态模型，并开发相应的动态模拟模块，在云南特殊地形地貌上的林火蔓延模拟做出一定探索。

To match end-user requirements precisely there's a choice of diesel-powered two-wheel-drive or four-wheel-drive models, and two-wheel-drive LPG models.

为了精确地满足终端用户的需求，我们提供了柴油动力的两轮驱动或者四轮驱动车型，以及液化石油气动力的双轮驱动车型。

From the point of view of application and manufacture,some theoretical researches on the magnetic actuator with permanent magnet on housing are carried out,and the direct-coupled models of magnetic fields for analysis and for calculation are presented.The static and dynamic characteristics of the models and the movement equation of the plunger are also discussed.

从研制及应用的角度出发，对高压断路器永磁操动机构进行了理论研究，介绍了永磁机构的基本结构及工作原理，给出了用于分析和计算的耦合磁场模型，研究了磁场模型的动静态特性以及动铁芯的机械运动方程。

Then the intellectual control technology of vacuum circuit breaker is discussed particularly. As a control object, the bi-stable permanent magnetic actuator is separated into basic principle so as to determine the nature of the whole. The direct-coupled models of magnetic fields for analysis and for calculation are presented. The static and dynamic characteristics of the models and dynamic behavior analysis and matching analysis for the vacuum circuit breaker with bi-stable permanent magnetic actuator are also discussed. For a further study, fuzzy neural network control technology based on synchronized-closing operation of vacuum circuit breaker is analyzed and the research conclusion is used for realizing the synchronized-closing of vacuum circuit breaker in the future.

论文首先分析了永磁机构的结构和工作原理；然后主要针对双稳态永磁机构真空断路器分析了在开断和关合过程中的静态磁场耦合模型、动态分析数学模型和真空断路器的动态特性，并就永磁机构和真空断路器的匹配进行了分析；最后分析了基于双稳态永磁机构真空断路器的同步操作问题，深入研究了同步操作的模糊控制原理和算法，研究结果为最终实现永磁机构真空断路器的同步操作奠定了基础。

This paper describes and compares 4 streamtube models (single-disk single-streamtube, double-disk single-streamtube, single-disk multi-streamtube and double-disk multi-streamtube models) based on the momentum theory for the hydrodynamic performance prediction of the vertical-axis variable-pitch turbine that may be employed to tap tidal stream energy resources, especially for the prediction of the overall turbine power coefficient.

以潮流发电水轮机的设计为研究背景，分析和总结了基于动量定理方法的四种流管模型(单盘面-单流管模型、双盘面-单流管模型、单盘面-多流管模型和双盘面-多流管模型)在竖轴变攻角水轮机的水动力性能计算中的应用，特别是能量利用率预报方面的应用。

The modeling methods about vestibule diaphragm, coupler and draft gear are introduced, too. Among the six Models, Model A and Model B can be used to study the vehicle stability and curve negotiation under different track situations. Model C and Model D can be used to carry out the stability, dynamic curving behavior and ride comfort of the high-speed passenger car. Model E and Model F are three-dimension train dynamic models which consist of three cars (head car, intermediate car and tail car).

所建立的6种动力学模型中，模型A和模型B可用于研究不同轨道条件下车辆的运动稳定性及动态曲线通过性能；模型C和模型D可以用来研究车辆的运动稳定性、动态曲线通过性能及运行平稳性；模型E和模型F是列车系统动力学分析模型，都是由三节车组成的列车单元，三车列车模型作为一个最小的列车单元，包含了头车、中间车和尾车，已能够反映整个列车的动力学特性。

Founded in Italy in 1889, Polverini has a history of more than 118 years. It is one of the most historic accordion manufacturer and the only accordion manufacturer with the ability to design and produce all kinds of accordions models (standard piano, chromatic accordion, diatonic accordion, convertor, MIDI accordion) and more than 100 other models.

意大利博罗威尼手风琴创始于1889年，有着120多年的悠久历史，是意大利手风琴历史最长的手风琴品牌之一，也是现存意大利手风琴工厂中历史最长的工厂，同时也是意大利唯一一家手风琴工厂有能力并且生产各种100多种不同型号的手风琴，包括键盘式手风琴/键钮式手风琴/全音阶手风琴/半音阶手风琴/传统低音手风琴/自由低音手风琴/电子手风琴。

The history and actuality of the observational and theoretical studies on gamma-ray bursts and their afterglows are reviewed, the theoretical models of this field are introduced in detail, and some problems of these models are discussed.

本文概述了gamma射线暴及其余辉观测和理论研究的历史及最新进展，详细介绍了gamma射线暴领域的理论模型以及存在的问题，并介绍了本人在硕士研究生期间所做的gamma射线暴分类和光变曲线研究方面的工作。

The main conclusions in this paper are as follows:In this paper, I selected two classical models describing predator-prey systems and introduce the Allee effects into the dynamics of both the predator and prey populations in these models respectively.

通过数学分析和计算机模拟，我们可以看出，Allee效应可能是捕食者-猎物系统中的一个不稳定的因素。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。