数学基础

Based on the mathematic model of BLDC motor, a combination of an improved BP neural network and a general PID con- troller is used in its speed servo system.

在分析无刷直流电机数学模型的基础上，采用改进型BP神经网络与传统PID相结合作为速度控制器，应用于无刷直流电机调速系统中。

On the basis of Kinematic and dynamic analysis of winch system of logging truck, the mathematic model of both winch system and hydraulic system can be built.

本文通过对测井车卷绕系统的运动学和动力学的分析，在此基础上建立了卷绕系统和液压系统的数学模型，对影响系统性能的干扰进行了理论分析，将其等效为随机干扰和阶跃干扰，研究了参数时变，非线性等特点对控制系统性能的影响。

On the basis of thermodynamics, the mathematic model of the working process of water-injected twin-screw air compressor has been established.

本文以变质量热力学为基础，分析了压缩过程中的气、液两相的潜热和显热的交换，考虑了两种泄漏模型，建立了喷水螺杆空气压缩机工作过程的热力学数学模型。

According to the seepage equation of the groundwater and using the finite element method, this thesis establishes the mathematics model for two and three dimensional seepage.

采用有限元理论，以地下水渗流方程为基础，针对基坑降水建立了地下水的二维和三维渗流数学模型，完善了深基坑降水渗流计算方法。对某一假定的深基坑降水工程分别进行二维和三维渗流数值模拟。

Based on the existing knowledge system basis and classified, according to various forms of several main methods limit summarized, and the method of representative examples to explain the applicability and typicality, strive to achieve the original knowledge to stabilize and improve the purpose of mathematical analysis, this course and the subsequent courses more experience and understanding.

本文在原有知识体系的基础上加以整理和归纳，针对各种形式的极限概括出若干主要方法，并配以代表性的例题来诠释方法的适用性和典型性，力求达到对原有知识的巩固和提高的强的，进而对数学分析这门课程以及后续课程有更深入的体会和理解。

The mathematical model of system is established on the basis of three-tank system material balance.According to nonlinear characteristics of three-tank level system,the controller is designed by using decoupling principle,which can make the nonlinear coupling of three-tank system uncouple into three first-order subsystems.

在三容系统物料平衡的基础上，建立了系统的数学模型，根据三容液位系统的非线性特性，运用解耦原理设计控制器，将三容系统的非线性耦合解耦为三个一阶子系统。

Langmuir isothermal absorption equation for unimolecular layer was analyzed. Based on the data obtained from the isothermal absorption experiments for caramel and alkaline degradation products to glucose on fresh calcium phosphate precipitates in sugar solution with different mass concentrations, a mathematical model describing isothermal absorption for this kind of fresh solid phase in multi-component liquid phase was established by modern computer technology.

通过分析单分子层等温吸附Langmuir方程，以不同质量浓度蔗糖溶液中新生磷酸钙固相对焦糖、葡萄糖碱性降解物的等温吸附实验数据为基础，利用现代计算机技术建立了描述这类新生固相在多组分液相中的等温吸附过程的数学模型。

It was proposed in the 1960's and developed rapidly in the 1990's. However, some theory problems, for example, the fluid dynamics and mass transfer during the filling up period which could not be dealt with in conventional distillation theories has been remained unstudied. And the simulation and mathematical models have to be made based on some assumptions, which are different from the actual situation obviously. Therefore the further development of DACO was restrained in the past years.

该操作方法自20世纪60年代提出，90年代以来得到了迅速发展，但众多学者的研究基本上集中在优化操作及其与传统恒回流法的比较，而许多重要的基本理论问题至今缺乏研究，特别是传统精馏理论无法涉及的塔内无回流充液阶段的流体力学和传质问题一直没有得到很好解决，导致了动态累积循环操作法的数学模型和模拟计算只能以与塔内真实状况相差很大的简化假设为基础，这严重地阻碍着动态累积循环操作法的进一步发展。

A model of a comprehensive evaluation of USAR team ability is further established with mathematical method, which emphasizes on the determination of the weight of each index in the index system.

在此基础上，运用数学方法建立了综合评价模型，重点在于确定评价模型中各指标的权重。

The existence of the solution is also demonstrated according to the sufficient conditions for the solution of the elliptic variational inequality.

首先证明了所构造泛函的强制性，从而证明了所构造的等价变分不等式解的惟一性，并根据椭圆型变分不等式解存在的充分条件论证了弹塑性接触问题解的存在性，为该问题的变分极值原理的建立莫定了数学理论基础。

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。