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ABSTRACT The researches of this thesis are carried out around the development of high performance machine tool spindle permanent magnet synchronous motor and its drive system. Five parts are included: First of all, concerning the operating characteristics of the machine tool spindle drive system, the optimum current control strategies of spindle PMSM are determined; The design rules of spindle PMSM's key parameters are summarized, based on the study on the influences of the design parameters on the performances of the PMSM operating at different current control strategies; The practical methods to improve the flux-weakening ability of the PMSM are presented; Based on the analysis and comparison of the operating performances of PMSM with different rotor structures, a novel PMSM rotor structure, which is of excellent mechanical performance, suitable for fluxweakening operation and can improve the torque output capacity in the same time, is presented.

本文围绕高性能机床主轴永磁同步电动机及其传动系统的设计研究展开，所做工作主要包括五部分：首先，确定了主轴永磁同步电动机定子电流的最优控制策略；通过对不同控制策略下主要设计参数对主轴永磁同步电动机性能影响的计算研究，总结了参数设计规律；提出了永磁同步电动机弱磁扩速的实用措施；在分析比较不同转子磁路结构电机的性能，尤其是弱磁扩速能力的基础上，提出了一种机械性能优越，易于弱磁扩速，同时能保证电机恒转矩运行时的转矩输出能力的新型转子磁路结构。

The study showed: Sown grass in plum orchard can resist drought, hold water content, increase soil fertility, improve soil structure, improve the views of orchard. It was a kind of important cultivation technique in modern fruit production.

研究表明：李园生草可以抗旱、保墒，提高土壤肥力，增强果园的观赏效果，是现代果园生产的重要栽培管理技术。

Sown grass in plum orchard can not only resist drought,hold water content,increase soil fertility,improve soil structure,but also improve the viewing effect of orchard.It is a kind of important cultivation technique in modern fruit production.

李园生草不仅可以抗旱、保墒，提高土壤肥力，改善土壤结构，而且能够增强果园的观赏效果，是现代果业生产的重要栽培管理技术。

Unscented transformation is used to improve the performance of extended kalman filter in the field of automatic control because it can reach accuracy of second order linear approximation. UT compensation can make us to estimate more accurate noisy acoustic model parameters corresponding to static feature of speech and we also proposes several kinds of engineering implementations to improve the efficiency up to six times faster than usual implementation of UT compensation.

针对声学模型参数在噪声环境下非线性变化的补偿问题，现在国际上广泛使用的PMC和VTS声学模型参数补偿算法只能达到其线性展开的一阶近似，所以本文通过使用自动控制领域用来提高扩展卡尔曼滤波器性能的称作Unscented Transformation的技术，可以达到对声学模型参数非线性变化的二阶近似，得到的声学模型参数更加精确。

It uses the crossover of topological sort list to guarantee that each offspring is a feasible solution and the search space is a global one. In order to improve the convergence of GA, it uses greedy strategy to improve the fitness of one chromosome in the population in crossover operator, based on Lamarckian theory in the evolution.

HGA使用拓扑排序表的交叉来保证下代的合法性和搜索空间的全局性，为了提高HGA的收敛速度，根据拉马克进化理论，在交叉算子中使用贪婪策略来提高个体的适应值，模拟结果显示HGA的调度结果和算法的时间复杂性都是令人满意的。

But there was no difference in tess and the relapse of one year between two groups.conclusions: paroxetine with small-dose quetiapine could improve the efficacy compared with paroxetine in treating depression,and could improve sleep orexis and the feeling of body discomfort.. but quetiapine had no distinct effect on relapse.

帕罗西汀合用小剂量奎硫平治疗抑郁症起效快，克服了抗抑郁药本身起效慢的特点，可提高疗效，并能迅速改善睡眠障碍和焦虑/躯体化症状，对复发率无明显影响。

Paroxetine with small-dose quetiapine could improve the efficacy compared with paroxetine in treating depression,and could improve sleep orexis and the feeling of body discomfort.. But quetiapine had no distinct effect on relapse.

帕罗西汀合用小剂量奎硫平治疗抑郁症起效快，克服了抗抑郁药本身起效慢的特点，可提高疗效，并能迅速改善睡眠障碍和焦虑/躯体化症状，对复发率无明显影响。

For their outpour, By the way of improve condition and leader they improve professional levels that what are come true the reason of the development of the teachers profession in the rural area. Basing on the analyzing, some suggestions are given out.

本文以农村在职教师专业发展为研究对象，力图在对当前农村在职教师专业发展方面存在的问题及原因分析认识的基础上提出了教师专业发展策略的建议。

Through way that software and hardware combine, improve electrical machinery output characteristic, make lift performance of control system improve.

通过软硬件结合的方式，改善电机输出特性，使电梯控制系统的性能得到提高。

With China's economic development, as China's accession to the WTO, the need to improve agricultural competitiveness, quality and quantity of agricultural output more needs to improve, this requires the re-establishment of a new operating system for agricultural land.

随着我国经济的发展，随着我国加入WTO，农业竞争力需要提高、农业产出质量和数量更需要提高，这些都要求重新建立一种新的农用地经营制度。

As a dominant party,CPC government should play a guardian,supervisee and guarantee role to overcome all the difficulties in the development of charitable cause and bring it into full play in the establishment of harmonious society on policies and regulations basis.

在中国共产党的文献中第一次把发展慈善事业提到&最广泛最充分地调动一切积极因素，不断提高构建社会主义和谐社会的能力&的高度来认识。近年来，社会学界对慈善事业的理论专著发表较多，有鉴于此，笔者不揣浅陋，谈谈自己的认识和见解。

Flow through the land, the land of the scale of operation allows the effectiveness of the land may be raised.

通过土地的流转，土地的规模经营可以让土地的效益得到提升。