505 research outputs found
Microstructure, Deposition Characteristics, Crystallization and Oxidation Behavior of CVD BxC Coatings
摘要 连续纤维增强的碳化硅陶瓷基复合材料(CMC-SiC)在高于450℃的氧化环境中,会因纤维和热解碳界面层的氧化而缩短使用寿命。化学气相沉积/渗透(CVD/CVI)制备的BxC涂层/基体能在600-1000℃的氧化气氛中生成液态的氧化物,填封陶瓷基复合材料的裂纹和孔隙,对材料起到很好的抗氧化保护作用。 本文以CVDBxC涂层为研究对象,通过对不同沉积工艺条件下制备的BxC涂层进行微结构分析,建立了沉积参数与产物微观结构、物相组成之间的关系;探索了CVDBxC的沉积机理;考查了CVDBxC沉积产物的晶化及氧化行为。主要研究内容及结果如下: 1、研究了CVDBxC的微观结构和物相组成。通过...Abstract When the continuous fiber reinforced silicon carbide matrix composites (CMC-SiC) are exposed to oxidizing environment over 450°C, the life of them can be shortened due to the oxidation of the fibers and the PyC interlayers between fibers and matrixes. The BxC coatings/matrixes prepared by CVD/CVI technique can be oxidized into liquid B2O3 at the temperature range of 600-1000oC in oxi...学位:工学硕士院系专业:化学化工学院材料科学与工程系_材料物理与化学学号:1932005130194
The Design and Implementation of Financial Business Platform for Wanan County
财政信息化经过30年的发展,财政应用软件由单机模式发展为网络模式, 业务处理由数据计算发展为业务流程管理,节约了财力、人力、物力,提高了 工作效率。但现有的财政核心业务系统由多个分散独立的系统组成,信息系统 “不统一、不系统”,系统自动化程度不高,信息共享程度不高,业务流程不 畅通等原因,形成了“信息孤岛”,数据分析和决策支持能力低,与科学化、 精细化的管理相距甚远,难满足当前财政改革发展的需要。 本文介绍了万安财政业务信息化现状以及实现财政业务平台的效果,还介 绍了实现财政业务平台的数据库、软件开发等相关技术,并用科学方法对财政 业务平台需求进行了分析,对指标管理、支付管理、...After the development of information technology in finance for 30 years, the mode of application software has changed from single to network, Business processing developed from data calculation to the management of business procedure, saved the human resources, material resources, financial resources and improved efficiency of work. However, the key syst...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X200923055
Researches on the Corporate Strategy of Xiamen Airlines: A Case Study in Industry Life Cycle Perspective
摘要 在行业生命周期的不同阶段,公司的发展战略应有不同:在成长期,应侧重做大;在成熟期,要侧重做强;在衰退期,则要战略收缩和战略转移,再在这一行业做大做强均不宜。中国民航业目前明显处于行业生命周期的成长期,航空公司的最佳发展战略是“做大”而不是“做强”,在成长期强调“做强”将失去发展机遇。而厦航的发展战略一贯以“做强”为重,这是厦航最大的战略失误。故作者认为,厦航应将“做大也是做强”作为公司战略的指导思想。通过对世界航空大国发展历程的数据对比,以及中国民航运输总周转量多年的发展数据,从宏观上对“中国民航业处于行业生命周期的成长期”这一判断做出确认,又以海航、上航、深航的快速发展来证明“航...Abstract In the Industry Life Cycle different stage, company's developmental strategy should have the difference: In the growth period,“Be larger” should be the first choice; in the mature period, “Be stronger” would be desirable; however in the recession period, no matter “Be larger” or “Be stronger” isn’t suitable, then the company most wants strategic contraction and strategic shifts. At pr...学位:工商管理硕士院系专业:管理学院工商管理教育中心(MBA中心)_工商管理硕士(MBA)学号:X20021544
Legal Thinking on Motorbike Ban -- from the scope of Trust
信赖保护原则是现代许多国家行政法的基本原则,我国法律虽然没有明确提出信赖保护的概念,但是条文中也体现了政府应诚实守信、依法行政的精神。信赖保护原则对于保障人权、维护社会秩序稳定、促进行政法治具有重大的意义。“禁摩”是行政机关对行政许可的撤销,根据行政许可法的规定,行政机关不得擅自改变已经生效的行政许可;为了公共利益的需要,行政机关可以依法变更或者撤回已经生效的行政许可。由此给公民、法人或者其他组织造成财产损失的,行政机关应当依法给予补偿。然而,绝大多数城市的“禁摩令”都是以政府规章或通告的形式颁发,在没有经过听证或其他正当法律程序的情况下,一纸禁令就禁止摩托车上路行使,没有任何后续补偿措施,严...The administrative faith protection principle is the basic principle of administrative law in many countries, although China has not specified the legal concept of trust protection, but the provision also reflects the government should be honest and trustworthy, according to law of the spirit. The principle for the protection of human rights protection principles, maintain social order and stabili...学位:法律硕士院系专业:法学院法律系_宪法学和行政法学学号:X200712011
Culture Management and Ritual Traditions of Lineage:A Case Study of Zeng Family and Si-Lang-gong Worship in Shuitou Village of Jiangxi Province
本文从文化人类学和社会文化史的视角,以江西南部一个偏远村落的宗族为个案,通过叙述其宗族源流与发展,以及建祠、修谱、祭祖、四郎公圣旦拜会等一系列宗族文化的建设,试图探析宗族发展与宗族文化的经营和仪式传统的承继之间的联系。 全文分为六章:第一章是前言,交代本文的选题缘起,回顾前辈时贤对中国村落社会、华南宗族等方面的研究成果,并说明本文的资料和研究方法。第二章简要介绍研究区域——上犹的生态、人口和历史背景,以期为后文的个案描述做背景铺垫。第三章着重从宗族源流、宗支衍派和兴衰起伏三个方面,试图说明水头曾氏的“宗族史”。第四章从祠堂、族谱和祭祖三个方面讨论水头曾氏宗族的文化经营活动。第五章主要讨论四郎...From the perspectives of Cultural Anthropology and Social Cultural History, this paper takes the lineage of a remote village in southern Jiangxi as a study case. By describing the origin and development of local lineage, the establishment of ancestral temple, geneology modification, ancestor worship, birthday ceremony of Si-Lang-gong and other developments of lineage culture, this paper attempts t...学位:法学硕士院系专业:人文学院人类学研究所_人类学学号:1062009115191
The development and applications of novel solid phase microextraction coatings and methods
针对目前固相微萃取(SPME)涂层在机械稳定性、热稳定性、生物适应性、萃取效率(特别是对极性和离子化合物)和萃取的选择性存在的问题,论文研究工作通过物理浸渍法、溶胶-凝胶法和光引发自由基反应制备了一系列物理化学性能稳定、吸附性能好的新型SPME涂层,并研究了涂层的萃取机理,建立了实际样品中有机污染物的分析方法。此外,论文还首次提出一种基于电泳和互补电荷萃取机理的电化学增强固相微萃取方法(EE-SPME),并应用于环境中的有机污染物和生物样品中药物的增强萃取。 1.第一章绪论。本章系统地介绍了SPME方法,包括其起源、发展、理论基础、涂层种类和制备技术的发展,应用范围等,并提出本论文研究工作的...Some of the disadvantages of current solid-phase microextraction (SPME) coatings are fragility of fiber support, insufficient organic solvent and thermal stability, low extraction efficiency (especially for polar and ionic compounds) and selectivity. To overcome these drawbacks, we have developed several SPME coatings with enhanced chemical, physical stability and sensitivity using sol-gel, physic...学位:理学博士院系专业:化学化工学院化学系_分析化学学号:2052007015362
Calibrating Testing and Data Processing of MEMS Rate Gyro
分析了以微电子机械MEMS技术制成的单片偏航角速率陀螺仪ADXRS150的匹配电路原理与工作原理,阐述了角速率陀螺仪的设计要点,设计并搭建了其标定实验平台,对其进行标定实验,通过对标定实验所得的数据进行处理和分析,得到标定曲线和误差分析关系式,从而给出在陀螺仪标定实验可行的数据处理方法。The matching circuit and the principle of the single chip rate gyro,ADXRS150,based on integrated micro electro-mechanical system have been introduced and analyzed.The keystone in design of the rate gyro was explained.The rotational stand for the test to the gyro was built and the calibrating has been carried out.The experimental data recorded by compute has been processed through analyzing.The relationship between the angular rateω and the output voltage V of the gyro is obtained.The error analysis for calibrating test data is presented.The result shows the method of the calibrating test and the data processing on the gyro is available.国家自然科学基金项目(50475099
- …
