数学基础

In this paper, based on the analysis of the structure, movement principle and math model of PMSM, fundamental theories of vector control, coordinates transform and algorithm of space vector PWM are introduced and PI control, speed and position calculation methods are discussed.

本论文在分析了PMSM的结构、运动原理及数学模型的基础上，系统地阐述了PMSM交流伺服系统矢量控制的基本原理、坐标变换方法及空间矢量脉冲宽度调制波的生成算法，论述了PI控制算法和速度位置计算方法。

Using predecessor's experiences,also taking account of Coriolis force and three directional coal gas flow,the trajectory mathematical model of burden flow is built.

在总结前人料流轨迹计算模型的基础上，考虑了科氏力及三个方向煤气曳力对炉料运动的影响，建立了料流轨迹数学模型。

If I can be admitted to the department of economics of the Art and Science College of Cornel University, besides trying to master theoretical knowledge of economics, I also will take many optional courses in advanced mathematics of the department of mathematics of the Art and Science College.

如果我被康奈尔大学文理学院的经济系录取，我计划除了努力学好经济学的理论知识外，还将在文理学院的数学系选修较多的高等数学的课程，我相信当我从康奈尔大学文理学院毕业的时候，我已为我具有光明前景的职业生涯构筑了坚实的基础。

If I can be admitted to the department of economics of the Art and Science College of Cornel University, besides trying to master theoreticalknowledge of economics, I also will take many optional courses in advanced mathematics of the department of mathematics of the Art and Science College. I believe that when I graduate from the Art and Science College of Cornel University, I have already built a solid foundation for a career of a bright

如果我被康奈尔大学文理学院的经济系录取，我计划除了努力学好经济学的理论知识外，还将在文理学院的数学系选修较多的高等数学的课程，我相信当我从康奈尔大学文理学院毕业的时候，我已为我具有光明前景的职业生涯构筑了坚实的基础。

Elementary school maths has certain abstract sex, but it is be a foundation with specific example and be a home to return to with more extensive corporeality.

小学数学具有一定的抽象性，但都是以具体的事例为基础并以更广泛的具体性为归宿。

On this basis, the available transfer capacity constraints of transmission lines are taken into account and corresponding mathematical model is established to describe it.

在此基础上考虑了输电线路的可用容量约束，并建立了数学模型对其进行描述。

The mathematical model of the control system of corrugated paper transverse cutting machine was established.

在此基础上提出了瓦楞纸横切机控制系统的数学模型，并验证了这类系统采用PI控制算法可以得到较好的控制效果。

Based on the general formula, its optimization mechanism is analyzed and the general mathematic description of particle's maximum covering space is deduced according to the current social information and personal experience.

在此基础上分析了标准PSO的优化机理，基于群体社会信息和自身历史经验的情况下，推导了粒子最大搜索空间的数学描述。

To the junior middle school student mathematics innovation ability's raise, the teacher overcomes to the innovation education understanding in the deviation is a key; Establishes the new teachers and students relations, the establishment loose atmosphere is the foundation; The careful establishment question situation, the development criticalness thought is a core.

对初中学生数学创新能力的培养，教师克服对创新教育认识上的偏差是关键；建立新型的师生关系，创设宽松氛围是基础；精心设置问题情境，发展批判性思维是核心。

First, the mathematical model of the HT oxide crystal growth is set, and then the dimensionless equations are given out. Finally, the boundary conditions are determined and the equations are solved by FDM. The simulation program is given by the above method.

首先建立了高温氧化物晶体生长的数学模型，然后给出了无量纲方程，最后确定了边界条件，使用有限差分方法求解了方程，并在此基础上编制了仿真程序。

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。