The designing of power converter bases on the principle of matching structure , high efficiency and convenient controlling . compared with several power converters , a kind of least main switch - components structure is put forward . this structure has several advantages such as low cost , simple control strategy and more safety 功率变换器的设计遵循结构匹配、效率高、控制方便的原则,在比较了多种功率变换器的结构优缺点的基础上,采用了一种主开关器件最少的方案,使得设计成本低、控制简单、安全可靠。
Physics device model , component structure design and fabrication technology are discussed based on the thorough analysis of strained silicon and soi physics mechanism . the detail contents are as follows . the analytical threshold voltage model , drain current model and transconductance model are derived from poisson ’ s equation for the fully depleted strained soi mosfet 本论文围绕这一微电子领域发展的前沿课题,在深入分析应变硅和soi物理机理的基础上,对器件的物理模型、器件结构设计和工艺实验等问题作了研究,主要包括以下几部分:首先,从器件的物理机制出发,建立主要针对薄膜全耗尽型器件的阈值电压、输出电流和跨导模型。
Basing on other researchers ’ work , this paper has put forward a novel type of icc ( induced current cancellation ) shielding layer for rfic / mmic performance improvement , to reduce high frequency loss , increase q value , and expand its application frequency range . and present how to realize rfic / mmic components such as i / o pad , inductors , baluns and so on by applying icc shielding layer structures . furthermore co - design methods of ic component structure and foundry process structure designs has been presented in this thesis 在无线通信技术对cmos射频/微波集成电路需求的大背景下,本论文提出了用于高频集成电路( rfic / mmic )器件的各类新型icc ( inducedcurrentcancellation ,感应电流相消)屏蔽工艺结构,由此设计制造的ic部件解决了传统半导体工艺无法实现射频/微波集成电路的难题,以达到降低高频集成电路器件的高频损耗,提高器件q值以及扩宽器件应用频带的目的。
( 2 ) analysing domestic and oversea existing gis softaware about its merits and fl - aws ; emphatically introduce the conspicuous merits of mapgis and supermap ; co - mpare two secondary - system - development way : single - secondary - development , integrate d - secondar - development ; discuss secondary - development course and predominance detail - ed based on component gis ( named comgis ) ; bring forward the requirement of dev - - elopment platform from data inputing , outputing , processing . analysing and capablity - c ost - ratio etc ; confirmed supermap as the system platform according to the system characteristics , and summarize its component structure , function and speciality ( 2 )分析了国内外现有gis软件的优缺点,着重介绍了mapgis和supermap两种gis软件的突出优点;比较了两种二次开发方式即单纯二次开发和集成二次开发;对集成二次开发中的基于组件式的二次开发过程和优势做了较详细阐述;针对mgis数据输入、处理分析和输出以及gis的性价比等方面提出了对gis开发平台的要求;根据系统的特点选择了支持组件式开发的supermap作为平台,对它的组件构成、组件功能和特点做了介绍。
Thirdly , the object - oriented way of lre knowledge representation for causality , system structure , and models is presented , and an organization model of lre diagnosis knowledge for integration of deep and shallow knowledge based on the lre component structure and in the form of node knowledge base is given . and finally , the lre intelligent fault diagnosis theory and strategy , which utilize synthetically different kinds of diagnosis knowledge and multiple reasoning methods , such as rule - based , model - based , fuzzy - knowledge - based , and dynamic - knowledge - based reasoning methods , are discussed and developed . the results verified by the test - firing data and the simulated fault samples show that , the theory and methods proposed give a theoretical basis for the design and realization of practical lre fault diagnosis and health monitoring systems , and can be available for reference in the development of health monitori ng technique for reusable space transportation systems in the future 主要研究内容包括:系统阐述了发动机诊断知识的概念、类别和相互关系;研究发展了定性和定量、浅层和深层、模糊和动态等多种诊断知识的图形和模型获取方式;建立了因果、结构和模型等不同层次和类别的诊断知识的面向对象表示方法,以及以发动机的部件结构为基础,以结点知识库为组织形式,深浅知识相结合的诊断知识集成组织模型;研究发展了综合多层次和多类别诊断知识,集成规则推理、模型推理、模糊推理和动态知识推理的发动机智能故障诊断理论和策略,并结合实际热试车数据和故障仿真实例对所发展的理论、方法与策略进行了验证。