研究工程

This dissertation, orienting to practical engineering applications, takes the lead in carrying out domestic investigations on expert system of fault detection and diagnosis for aerospace propulsion system and has successfully established a well-performed expert system for fault detection and diagnosis based on advanced theories and technologies. What is more, some research has been conducted on the new algorithmic method for fault detection and diagnosis; bondgragh method has been successfully used for fault detection and diagnosis in aerospace propulsion in the dissertation.

本文在国内首先应用先进的理论和技术，面向工程应用的实际，开展了空间推进系统故障检测与诊断专家系统的研究工作，并建立性能良好的故障检测与诊断专家系统；还进行了故障检测与诊断新算法研究，成功的运用键合图理论完成了空间推进系统的故障检测与诊断研究。

Thirdly, it analyzes and studies in detail Surpac mechanism and the relevant concepts on constructing the model of mineral deposits and mining engineering systems according to the modeling procedure and the actual conditions of Jinchuan"s mines. Based on these:Lit points out some differences between the western countries and China in the practice of the geological data record, explores the inputting data on computers performed by more people at the same time and the method to improve constructing the data-base and finished the data-base of Jinchuan mineral deposits;2.It puts forward the steps and flow chart to construct the solid model and brings forward the scheme of "first individual then whole to set up Jinchuan mineral deposits geological model, summarizes some experiences for constructing the complicated geological ore body of the high accuracy: add control lines, add auxiliary demarcation lines +control lines, the operation of intersection, cross and incorporation between solid bodies and plane and section combination. The above-mentioned methods applied to construct the mineral deposits solid models of four mine areas in Jinchuan; 3.lt studies and presents the detailed flow chart of constructing block and grade model, analyses the workable scheme in setting up the block and grade model of main ore body for Jinchuan mineral deposits and also sets it up.

接着，按建模流程并结合公司矿山实情，详细研究、分析了Surpac构造矿床模型和采矿工程系统模型的机理、有关概念，在此基础上：(1)指出了西方国家与我国在地质数据记录习惯方面存在的一些差异，探索出多人多机同时录入、提高建库效率的方法，建立了金川矿床地质数据库；(2)研究并提出了构造实体模型的步骤和流程图及&先分后整&建立金川矿床地质体实体模型方案，总结出建立高精度复杂地质体模型几点经验：添加控制线法、添加辅助分界线+控制线法、实体间的交、叉、并运算法及平剖面图联合法，建立了金川矿床四个矿区主矿体的实体模型；(3)研究并提出了建立块模型、品位模型详细流程图，分析了建立金川矿床主矿体块模型和品位模型的可行方案，建立了金川矿床主矿体的块模型和品位模型。

Taking the slurry seal coat as the object of study,key technologies such as the working principle,technical characteristics,mix design and construction technology are studied.

以稀浆封层技术为研究对象，对其工作机理、技术特性、配合比设计及施工工艺等关键技术进行研究，研究成果可以有效地指导稀浆封层技术的应用，具有一定的工程价值。

In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

Research and development of bone graft substitute have received publ ic attention. A very great progress has been made in the research and appl ication of allograft bones, synthetic bones and engineered bones, and some research results have been put into use for real products.

骨移植替代材料的研究与开发受到广泛重视，在异体骨、合成人工骨、组织工程骨的研究与应用方面已取得很大进展，部分研究成果已形成产品。

This method bases on the model of technology of informatics of nerve system.

&数字人脑&以人脑高级中枢神经系统为主要研究对象，在多领域的研究成果的基础上，从交叉学科的视角研究开发基于人脑神经系统信息学技术模型的工程应用系统的方法。

The research purpose of this paper is on the thickness design of strengthening asphalt overlays, and the research way is based on analyzing the using of Falling Weight Defiectometer in the area of pavement design and analyzing the priority of FWD -this kind of nondestructive deflection testing equipment, the emphasis is using of the testing results and research production of FWD in overlay design.

本论文的研究对象是针对结构性补强型沥青混凝土罩面进行厚度设计，研究思路是以落锤式弯沉仪在路面工程设计领域的应用为根本目的，在分析FWD这种无损弯沉测试设备先进性的基础上，结合对各种沥青路面罩面设计方法的分析，着重研究了如何将FWD的检测及分析成果应用于沥青路面罩面设计方法中去。

Grant, contract and consultancy work is performed for many customers including the European Space Agency, the Engineering and Physical Sciences Research Council, EADS Astrium, VEGA, Thales Alenia, QinetiQ and DLR.

所从事的研究工作有各种研究合同以及咨询工作，用户包括欧空局、工程和物理科学研究委员会、EADS 阿斯特利姆、VEGA、Thales Alenia、QinetiQ和DLR等。

At present, electric propulsion technology has been widely applied in space flight missions and ascendant performance of electric thrusters makes them a substitution of traditional chemical propulsion system like monopropellant and bipropellant motors gradually.

中文题名电弧喷射推力器数值模拟与实验研究副题名外文题名 Numerical simulation and experimental study on arcjet thrusters 论文作者汤海滨导师刘宇教授学科专业航空宇航推进理论与工程研究领域\研究方向学位级别博士学位授予单位北京航空航天大学学位授予日期2002 论文页码总数134页关键词电弧喷射推力器火箭发动机电推进推力器馆藏号BSLW /2002 /V439 /3 目前，电推进装置已广泛地用于空间飞行任务，优越的性能使其正在逐步取代单、双组元等传统的化学推进系统。

This paper reviews and summarizes the progress in this field as follows: the mathematical model and the difficulty of the analytical solutions is introduced; discusses the latest progress of the numerical solutions is discussed; the finite difference method, the Godunov method, the Boltzmann method, and the KFVS method of one-dimensional dam-break problem are introduced; the TVD method, the discontinuous finite element method, the finite volume method and characteristic method of two-dimensional dam-break problem are discussed; the applicability, the advantage and the disadvantage of each method are analyzed; and the progress in the numerical calculations of flow of fluid with free surface are presented.

回顾和总结了国内外对溃坝水流演进问题的研究进展：介绍了溃坝水流的数学模型及解析解法存在的困难，进而讨论了数值解法的最新进展；论述了求解溃坝水流一维问题的有限差分法、近似黎曼解的Godunov格式法、Boltzmann法、KFVS法和二维问题的TVD格式法、间断有限元法、有限体积法、特征线法，并分析了各种方法的适用范围和优缺点，及讨论了限制函数的使用；介绍了利用自由水面追踪方法计算溃坝水流的研究进展，并根据目前存在的不足和实际工程的需要，提出了进一步研究的方向和发展趋势。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！