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Then analyses the principle of direct current moment electromotor and builds the mathematical model and gives the block graph of transfer function and studies the PWM control strategy.

然后对直流力矩电机工作原理进行了分析，建立了直流力矩电机的数学模型，给出了直流力矩电机传递函数框图，研究了直流力矩电机的PWM控制方式。

With the popularization and application of computer-making-graph technique in all trades and professions, this new technical medium is widely used in graph of function teaching as auxiliary mathematical classroom teaching at home and abroad, as strongly advances an in-depth study in graph of function teaching.

伴随着电脑作图技术在各行业的普及与应用，国内外函数图像教学中普遍采用这一新的技术手段辅助数学课堂教学，有力的促进了函数教学向纵深阶段发展。

The graph theory is one of the mathematical foundations in studying network.

在论文的第二章我们详细介绍了该软件的设计原理。

Based on skeleton graphics, a handwritten Chinese character is defined as a set of isolated branch, isolated loop and component. Relation among these three elements is also defined, and then a mathematical model is raised.

针对小类别数手写汉字，在骨架图形的基础上，把手写汉字看作孤枝、孤环和部件的集合，并定义三者之间的方位关系，从而建立手写汉字的数学模型。

Using Chebyshev approximation method,we designed a FIRlowpass differentiator suit for airborne gravimetry application,and simulate a mathematical model to test the reliability of this filter.

根据契比雪夫逼近理论，设计了适用于航空重力测量应用的有限冲激响应低通差分器，利用模拟模型对滤波器的性能进行了验证。

Newton's problem was to express in mathematical terms the gravitational force between different bodies.

牛顿的目标是要用数学形式来表示不同物体之间的引力。

Watershed is an image segmentation method based on region and mathematical morphology, and it is widely used in the segmentation of gray scale image.

分水岭变换是一种基于区域和数学形态学的图像分割方法，被广泛用于灰度图像的分割之中。

In this thesis, an evaluation methodology of IR screening smoke's countermeasure effect is suggested based on grayness system and a mathematical model is deduced.

提出了基于灰色系统观点的定量评估方法，并导出其数学模型，通过计算机仿真研究及讨论，获得了一系列结论。

In this thesis, an evaluation methodology of IR screening smoke's countermeasure effect is suggested based on grayness system and a mathematical model is deduced. A series of conclusions are obtained by computer simulation and discussion.

提出了基于灰色系统观点的定量评估方法，并导出其数学模型，通过计算机仿真研究及讨论，获得了一系列结论。

In the first part, first, the operational principle of Varivec Propeller is explained. Secondly, the mathematical model for predicting longitudinal and transverse movement hydrodynamic characteristics of Varivec Propeller under steady or unsteady condition are present, based on the general propeller lifting-surface theory, potential flow theory and Green theorem. Thirdly, theoretical calculation methods for predicting hydrodynamic characteristics when the influence of paraboloidal boss on the performance of Varivec Propeller is or isn't considered are present, based on The finite basic solution method, the unsteady vortex lattice method and Hess-Smith method Different rake angle is adopted according to different desire in practical application.

在理论计算部分，本文首先给出了全方向推进器的工作原理，然后基于常规螺旋桨升力面理论、势流理论和格林定理建立了定常和非定常状态下全方向推进器纵向、横向运动的水动力性能计算的数学模型，并利用有限基本解法、非定常涡格法和Hess-smith方法分别对考虑和不考虑桨毂影响时的全方向推进器纵向、横向运动水动力性能进行了数值预报。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。