查询词典 thesis

In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.Then the thesis expounds the basic component parts,the basic running principle,the running characteristic and transfer function of the BLDCM.And then the thesis detailedly dissertates its research pivot: the simulation of BLDCM system in MATLAB based on the method of Back-EMF and the control system of Digital Signal Processor based on the method of Back-EMF.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

Theoretically, the present thesis is based upon the encouragement theory in the study of administration. The literature of the thesis is mainly devoted to the survey of research at home and abroad in two aspects: the young teacher development and encouragement mechanism. Methodologically, the thesis is a case study of Northwest Normal University. With the statistical analysis of the status quo of teaching and research, as well as the demand of research of the young teachers in the university, the thesis treats the current encouragement system, summarizes the conspicuous problems and then advances countermeasures in the research enragement system of young teachers in these universities based upon the qualitative and quantitative studies.

本文以西方管理学激励理论为指导，以国内外青年教师培养和科研激励机制研究方面的文献为参考，以西北师范大学为个案，在对西北师范大学青年教师科研和教学现状统计分析、科研需求调查统计分析、现行科研激励机制审视的基础上，采取定量与定性相结合的研究方法，概括出西部教学研究型大学青年教师科研激励机制方面存在的主要问题，并分析存在问题的原因。

Based on the management principle and objective of Jiangsu SNWDP, the thesis establishes its management framework and designs three management patterns and four modes. Through analyzing the anticipative management effect, scopes in point, advantages and disadvantages of each modes seriatim, the thesis confirms the recommended pattern. It makes framework refinement design, defines rights and duties of control level, execution level and participation level for the recommended pattern. According to the principles of planned water use, metered water use, contract water use, toll water use, it studies project operation for recommended pattern from four aspects, namely water supply plan, measure intensified, water supply contract, and water rate enacted. The thesis analyses and studies how to ensure water supply quality of Jiangsu SNWDP from three levels, including doing watershed protection, intensifying intermediate process, and establishing a long-term mechanism. It makes brief design for dispatching management applied system, studies emphases parts which may affect operation of the pattern in practice, also analyses dispatching optimization of Provincial boundary project management, pumping station management, and different water resources. Finally, the thesis studies relevant basal supports and development stratagems for the management of Jiangsu SNWDP.

本文从分析南水北调江苏境内工程的管理原则、管理目标入手，构建南水北调东线江苏境内工程管理组织框架，设计了管理的三种模式，四个方案，对各种方案的预期管理效果、方案的适用范围、方案的利弊逐一分析，经比选后确定推荐模式；并对推荐模式进行结构细化设计，界定调控层次、执行层次、参与层次的权责；从供水计划、加强计量、供水合同、水价制定方面对推荐模式进行了工程运营的具体研究；从做好源头保护、强化中间过程、建立长效机制三个层次，分析研究如何确保南水北调江苏境内供水水质；对调度管理应用系统作了简要设计；针对实际管理中可能影响整个模式运行的重点细部：省界工程管理、泵站工程管理、不同水资源的优化调度等进行了研究；本论文还分析研究了南水北调江苏境内工程管理的相关基础支撑和发展战略。

In this thesis, how to study and apply of system of CRM based on Web are discussed. Firstly, we summarize the principle of CRM, beginning with the current research condition, and introduce the concept, features and management principle of CRM. Secondly, we illustrate the basic architecture of web-based CRM system to form the basis of the further research and propose the integration of CRM system to the front end of enterprise, namely, the study on the business process re-engineering of CRM system. Then we discuss the key technique knowledge on CRM system based on Web, which included the technology of system interface, system safety and the design of net framework. And explain the technology of web service is a good solution to the problem of system interface in the Internet and the advantage of the develop way based on the B/S pattern. According to an application of CRM system based on Web, this thesis explains how to set up a CRM system based on Web, which include the customer requirement, analyzing the business process, system framework and system safety. At last, this thesis puts forward the extensive foreground of the system of web-based CRM with the expanding of the web technology and explains that there are some questions are to be resolve stilly in this thesis.

本文的研究内容首先从客户关系管理的研究现状出发，对客户关系管理加以概述，阐述CRM系统概念、系统特点和核心管理思想；并阐明了基于Web的CRM系统的基本架构为进一步的研究作铺垫，提出CRM系统对企业前端的整合，即对CRM系统的业务流程重构的研究；接下来说明基于Web的CRM系统开发的关键技术，包括系统体系结构的选择，系统接口以及系统安全三方面的技术要求，具体说明了B/S模式的原理及优点，Web Service是解决基于B/S模式系统的接口问题的最好方案；然后以一个销售管理CRM系统为例，说明如何构建一个基于Web的CRM系统，包括了系统设计要求、系统实现、系统功能框架和系统安全机制；最后根据当前通信和网络技术的发展，展望基于Web的CRM系统应用的广泛前景，并对在本文研究中还存在需要改进的地方进行了探讨。

The motive of this thesis is based on the author's long term observation of the unproportionate concerns of food tourism despite its major position in cultural tourism. Hopefully this thesis could recall our society paying more attention to the food tourism. As the saying goes "Deeds speak louder than words", this thesis will try to analyze the direction of our cultural tourism and characteristics of food tourism, and observe the change of journeys and opinions of tourists from Mainland China. From this we then propose suggestions of how to integrate food tourism into cultural tourism to build up a new era of food tourism in Taiwan. This thesis is composed of four chapters.

本论文撰写之动机在於笔者有鉴於饮食观光产业身为文化观光重要的一环，因此希望能够藉由此篇论文来增加社会对饮食观光的重视，同时为避免流於学术象牙塔里的空谈，本文也试图透过分析台湾的文化观光发展方向与饮食文化特色，观察开启陆客来台后的行程和民间意见的变化，并思考如何将饮食文化结合入文化观光，希望能够藉此推广台湾发展饮食文化观光的新思维。

Besides, the author also give a detailed analysis and conclusion from the four levels of the total layout, building flat surface layout, building space and the exterior space shape. First, the thesis analyzed the race building, aim at the special natural environment and social milieu, i.e. how its total layout is; the concrete nature adaptability to the natural and social features. Second, this thesis analyzes the feature of layout in this origin with the examples of store, house, general residence, house, courtyard, public buildings and the clues of person's living mode. Furthermore, the thesis launches from street space, courtyard space, indoors space to explore the villages and living room of the nationalities such as 汉,土家,苗,侗. Finally, the thesis gives a specific analysis of the exterior space and nature factor, unreasoned composition of exterior space and fortuity, the relationship between the exterior space and function, the exterior space and geography and hang feet floor and horoscope doors and fence etc.

首先，论文分析了民族建筑针对特殊的自然环境与社会环境，其总体布局如何；具体体现自然适应性和社会适应性的特色：其次，论文以店宅、一般住宅、宅院、公共建筑四种湘西民族建筑类型为主，以相应的人的生活模式为线索，分析湘西民族建筑的平面布局特色；再者，论文从街道空间、院落空间、室内空间三个部分展开，同时对湘西地区汉族、土家族、苗族、侗族的村镇和民居建筑空间分别进行了颇有民族特色的着力探寻；最后，论文分外部空间造型与自然因素、外部空间造型的非理性与偶成、外部空间造型与功能关系、外部空间造型与地形关系、吊脚楼及八字门与围墙等六个部分，具体分析湘西民族建筑外部空间造型特色。

In order to avoid the ill infection, the thesis put forward the countermeasures: changing the government's function, improving the mechanism of evaluation about Levy upon ground and housebreaking, the property exchange should exchange the original address'property. The problem of farmer who loses ground is a serious factor that produces inharmonic society. In order to avoid the ill infection, the thesis put forward the countermeasures: the farmer should be guaranteed by the lowest life guarantees, establishment and perfect the system of farmer's endowment insurance and medicare, establishment and perfect the education and the training mechanisms of farmers who have no ground. The problem of housing that the people who have no money or a little money is the other factor that produces inharmonic society. The thesis put forward the principle of the countermeasures: one is there is house for the people who no money or have a little money for house to live; one is that the countermeasures dont affect the marketization of the housing reform. According to the principle,the thesis put forward the approach:improving on the economical-housing policy,extending low-cost house policy,the rental allowance should mainly for money.

针对西部地区房地产业发展中影响西部地区和谐发展的两大主要因素—征地拆迁和公共住房保障问题进行了专题分析，提出了解决拆迁问题的对策是转变政府职能、改进拆迁评估机制并遵循产权调换应该以原址调换的原则；为解决失地农民长期生活保障，本文提出了把失地农民纳入最低生活保障制度的保障范围，建立和完善失地农民养老、医疗保障制度，建立和完善失地农民的教育和培训机制等主张；针对西部地区公共住房问题，本文提出了使西部地区广大中低收入群众居者有其屋、不影响西部地区房地产改革市场化方向发展原则为解决对策，并提出了在这个原则下的具体解决途径：改进经济适用房政策，扩大廉租房供应对象，廉租房补贴形式以货币补贴为主，让受补贴对象自由选择现有市场存量房或新建廉租住房房源。

In respect of image group, the thesis focuses on analysizing the philosophical implication and aesthetical connotation of the wildness, the grape garden, and the animal images; the thesis holds that those images express Zhang Wei's expectation of ideal life and his castigation of the unequitable reality. In respect of stylistic feature, the thesis focuses on elaborating the poetic style of narration; the thesis holds that the strong lyric flavor, the rich philosophical connotation, the conciseness and vividness in language, and the originality in conception are the key factors in making of the poetic traits. The thesis also points out the identical inclination in his novels in the respect of the art conception.

在意象群体方面，重点分析了野地、葡萄园和动物意象的哲理意味和美学内涵，本文认为这些意象更多寄托了作者对理想生活的期待和对不合理现实的鞭挞；在文体特征方面，重点阐述了&诗化&叙述方式，文章认为小说所具有的浓厚抒情色彩和哲理内涵以及语言上的凝练生动、构思上的推陈出新都是构成其&诗性&特征的重要因素，对作者在艺术构思上的雷同化倾向，本文也进行了揭示。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。