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In this paper, the mathematic model of a. c. excited generator system based on field-oriented control is established first. The simulated results operating at no-load and steady state are agreed with the test waveforms by means of 2. 8kW ACEG prototype developed by Harbin institute of large electrical machinery and Zhejiang University.

本文建立了磁场定向控制交流励磁发电机系统的数学模型，并采用哈尔滨大电机研究所和浙江大学联合研制的2.8kW ACEG系统实验原理样机，测试。。。

In order to calculate the crack expansion life in the action of variable amplitude load for the metal bar with V-shaped notch, the formula of bar fracture frequency was obtained theoretically by setting a size of bar fracture region applied in the engineering. Based on it, the mathematic expression of crack expansion life of bar V-shapednotch tip in the action of variable amplitude load was built.

针对金属棒料在变幅载荷作用下需要较精确地获取其V形槽尖端裂纹扩展寿命的问题，通过给定一个工程上能接受的瞬断区尺寸，获得了棒料断裂频率的计算公式，在此基础上，建立了变幅载荷作用下棒料V形槽尖端裂纹扩展寿命的数学表达式。

Through the analysis I have established its static state mathematic model and dynamic state mathematic model.

在此基础上，分析建立了柴油机调速系统的动态数学模型。

Recently with intervention of multimedia knowledge and rapid development of computer software, we start to try to use the multimedia into the mathematic teaching. In practice, it makes our teaching in class take on a new look. At the same time, it also refreshes our ideas about the mathematic teaching.

近年来随着多媒体知识的介入与计算机软件的飞速的进步，我们开始探寻把多媒体运用到数学教学中，在实践中，使我们的课程焕然一新，同时也在更新我们的数学教学观念。

In the chapter 4, some mathematic modules are constructed , which are rules of the system programs, we use second-grade parameters to identify input signals. Based on mathematic modules and second-grade parameters, system programs using "Top-Down" designing idea are divided into some module programs in the chapter 5, At the end of this chapter, questions and resolutions in testing are introduced; In the last chapter .application of download characteristics of MCU is used on long distance update , so the totalizer can be used in broad fields if software designed reasonably .

第四章中先介绍了程序中使用的一些数学模型和利用设置二级参数确定输入信号类型的方法；第五章中介绍了采用自顶向下的模块划分程序设计方法编制的系统软件的过程，并在章末介绍了系统调试方面出现的问题和相应的解决方案；第六章利用MCU的下载特性和网络功能，推出实现智能仪表软件的远程升级方案，通过软件设计，使得仪表有了更为广泛的应用空间，实现单表多用。

In the historical evolution of mathematic thought, content and method, m athematic truth has assumed some postmodern characteristics.The targets of the pursuit of mathematic truth have changed from the objectives and valu es of metaphysics to the relative and varied theoretical constructions.Mat hematic truth is an open system with different levels and frameworks. It h as transcended the scope of natural truth and has generated a new dimensio n,i.e.,selectivity.Both formalization and non-formalization are effec

在数学思想、内容与方法的历史性变革过程中，数学真理的观代性开始发生转向，逐步表现出一些后现代特征：数学真理从追求形而上学的目标与价值转向追求相对的、多样化的理论构建；数学真理是一个具有不同层次性和等级结构的开放体系；数学真理超越了自然真理的范畴，开始生长出一种新维度——可选择性；形式化与非形式化都是获得数学真理的有效手段。

By study, majority of the research productions and theoretical papers are about how to control harmonic, and the harmonic analysis methods that were introduced are generally applied in large power system, these harmonic analysis methods usually use harmonic network's mathematic model (the conductance and susceptance matrix of the node). But because of the dissymmetry of some elements in power system, the mathematic model is very complex, so it is very complicated to calculate by these methods, we commonly combine with computer and use them to analyze large power system.

通过学习和了解，现有的研究成果和理论文章多数是介绍谐波的治理方法，而介绍谐波分析方法的论文一般是针对大型电力系统进行分析和研究的，这些谐波分析方法通常利用谐波网络的数学模型（谐波网络的节点导纳矩阵）进行分析，由于电力系统中的某些元件的不对称性，使得数学模型复杂，计算起来极为繁琐，因此，一般结合计算机用于分析大型电力系统。

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

This paper studies environmental factors which influences Shanxi market of BYS Pharmaceutical Corporation applying theories and means of marketing and administration, makes qualitative and quantitative evaluation to exterior and interior environmental factors by using EFE and IFE matrix, and analyzes the actual place strategy. This thesis constructs generic mathematic model to estimate franchisers' integrated managerial abilities in order to choose the right middlemen; on how to evaluate dealers' performances, conceives mathematic model of franchisers' performance evaluation pole method to appraise their performances, and applies Fussy evaluation model to estimate the place pattern of pharmaceutical corporation, and makes embedded research into place motivation, conflict management and place improvement.

本文运用市场营销管理、管理学的理论和方法，研究了影响BYS制药企业山西市场营销的环境因素，运用EFE矩阵、IFE矩阵对外部环境、内部环境关键要素进行了定量定性评价；对营销渠道策略进行了分析研究，在对中间商的选择方面，论文构造了中间商的综合经营能力评价与选择的一般数学模型并运用其对中间商的综合经营能力进行了评价；论文对中间商绩效评价进行了探讨；运用Fussy评价模型对BYS制药企业营销渠道模式进行评价；并对渠道策略中的激励、冲突管理以及渠道改进等方面的内容进行了深入的研究。

In order to understand the operation safety and pipe service life span of rear superhearter, the essay established dynamic mathematic model of single piece of screen of rear superhearter, including the following sub-models: flue gas side model, steam side and metal pipe wall mathematic model, flow calculation model and wall temperature calculation model.

为了更好地了解后屏过热器运行的安全性和管子使用寿命，本文建立了后屏过热器中单独一片屏的动态数学模型，其中包括以下几个子模型：烟气侧模型、蒸汽侧和金属管壁的数学模型、流量计算模型和壁温计算模型。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。