Research on Aerodynamic Parameter Identification for Fixed-wing Flight Vehicle

本文研究利用多种参数辨识技术确定飞机纵向运动模型的参数问题，选取飞机纵向小扰动线性运动方程作为辨识模型，以外加激励重复激发某型飞机纵向飞行模态，并以其中有效飞行实测数据为例分别采用方程误差法和输出误差法从时域和频域的角度辨识了模型中的气动参数，同时对辨识结果以及辨识过程中发现的问题进行了分析研究。 本文所做的主要工作如下所述。 1.在系统辨识算法方面，介绍近年来应用于飞行器气动参数辨识比较成熟的线性回归法和极大似然法基本理论，构建基于该理论的辨识方法；对比两种辨识算法各自的特点，分别比较它们在时域下和频域下的算法。 2.在辨识实验设计方面，构建飞行器辨识模型，介绍应用于飞行器气动参数辨识...In this thesis, estimation problems of aerodynamic coefficients of flight vehicle are investimated via various methods. Linear motion equations are adopted as identification mathematic model. Main motion modes in longitudinal direction have been excited with active incentive signals repeatly. Then longitudinal aerodynamic parameters are indentificated with equation-error method and output-error me...学位：工学硕士院系专业：物理与机电工程学院_航空宇航制造工程学号：3202010115269

Study of Corrosion and Inhibition of Copper Clad Laminate and Reinforced Concrete

摘要 1．覆铜板腐蚀行为研究 电子材料是信息社会的基础和先导。覆铜板(CCL)作为电子元器件支撑体同时又是电子元器件电连接,是一种最基本的电子材料。CCL在环境的作用下发生铜的腐蚀，可造成整个电子设备的提前失效。本工作主要应用电化学方法和电化学拉曼光谱技术对覆铜板在NaCl溶液中的腐蚀行为进行探索。 （1）在含氯环境中覆铜板的耐腐蚀性能比纯铜弱，这可能是由于覆铜板中添加少量合金元素及机械加工成形过程可导致耐蚀性的降低。 （2）通过循环伏安曲线的测试，对CCL的阳极过程和阴极过程的有关反应进行了指认。结果表明，正向扫描两个氧化峰分别对应铜的两个氧化态的产物的生成，电位回扫时出现的“小氧化...Abstract Part 1. A Study on the Corrosion Behavior of Copper Clad Laminate Electronic materials are the foundation and precursor for the modern information technologies. As the support and the joint of the electronic components, corrosion of copper on the surface of copper clad laminate (CCL) may cause failures of electronic devices or equipments in practical services. In order to enhance ...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：20042506

Calculation of Ultimate Shear Strength of High Strength Concrete Column Reinforced with Concrete Filled Steel Tube

介绍了以圆钢管为钢骨的劲性高强混凝土柱的剪切性能试验的试验概况,在此基础上研究了它的斜截面承载力计算方法。在计算时,采用了将构件分成几个独立的抗力机构,相互叠加构成构件抗力体系的计算方法的计算模型。进而利用剪切性能试验得到的数据结果进行参数回归,得到以圆钢管为钢骨的劲性高强混凝土柱的斜截面承载力计算公式。General situation about shear experiments of high concrete columns reinforced with concrete filled steel tube is presented,and method for calculating ultimate shear strength of the columns is discussed based on the experimental results.Shearing resistant mechanism of the columns can be made up of several simple individual shearing resistant mechanisms,and then the formula for calculating ultimate shear strength can be established by superposing the actions of these shearing resistant mecnanisms.In the further analysis,the unknown parameter in the formula is regressed using the test data of shear experiments

NUMERICAL ANALYSIS OF LOAD-MOMENT INTERACTION DIAGRAM FOR HIGH STRENGTH CONCRETE COLUMN REINFORCED WITH CONCRETE FILLED STEEL TUBE

介绍了以圆钢管为钢骨的劲性高强混凝土柱的抗震性能研究的试验概况,在此基础上采用条带有限元法进行了弯矩-轴力相关曲线的数值分析,计算结果与试验结果大致吻合,可以用于确定该类柱在偏压状态下的极限承载力。The general situation of earthquake-resistant behavior experiments of high concrete columns reinforced with concrete filled steel tube is presented.Based on the experimental results,the numerical analysis of load-moment interaction diagram for the columns is completed using strip finite element analysis method.The calculation results are in basic agreement with those of the experimental values,so the numerical analysis method can be used to determine the ultimate bearing capacity of the columns under eccentric compression

Ultimate Strength of High Strength Concrete Columns Reinforced with Concrete Filled Steel Tube Under Axial Compression and their Reliability Analysis

为了探求一个合理的设计公式来计算带圆钢管的劲性高强混凝土柱在轴压下的极限强度,完成了包含13个短柱试件在内的轴心受压试验以研究该类柱在轴压下的破坏模式和极限强度.试验结果表明,在荷载作用下,直到荷载接近极限值时,柱中钢管、纵向钢筋以及混凝土三者之间的纵向应变基本上是协调的,计算结果与试验结果吻合良好,因此可以采用叠加原理来计算带圆钢管的劲性高强混凝土柱在轴压下的极限承载力.此外,分析了该极限承载力计算公式的可靠度水平.分析结果表明,该承载力计算满足GB50068-2001对构件可靠指标的要求.This paper aims at developing a rational design formula to predict the ultimate strength of high strength concrete columns reinforced with concrete filled steel tube (HSCCRST) under axial compression. In order to investigate the failure mode and the ultimate strength of the columns under axial compression, experimental tests of 13 specimens under axial compression were performed. Test results showed that the longitudinal strain of the steel tube, the longitudinal reinforcement, and the concrete in the column were all compatible under loading until the load applied was close to the ultimate load. Therefore, the ultimate strength of HSCCRST could be calculated in the principle of superposition. In addition, the reliability level of the columns under axial compression designed following the proposed formula was investigated. Analysis results indicated that the reliability indexes of the columns designed following the proposed formula satisfied the demand of Unified Standard for Reliability Design of Building Structures (GB 50068-2001), National Standard of the People's Republic of China.国家自然科学基金资助项目(50378034

Production and Radioprotective Effects of Pyrroloquinoline Quinone

Pyrroloquinoline quinone (PQQ) was produced by fermentation of the Methylovorus sp. MP688 strain and purified by ion-exchange chromatography, crystallization and recrystallization. The yield of PQQ reached approximately 125 mg/L and highly pure PQQ was obtained. To determine the optimum dose of PQQ for radioprotection, three doses (2 mg/kg, 4 mg/kg, 8 mg/kg) of PQQ were orally administrated to the experimental animals subjected to a lethal dose of 8.0 Gy in survival test. Survival of mice in the irradiation + PQQ (4 mg/kg) group was found to be significantly higher in comparison with the irradiation and irradiation + nilestriol (10 mg/kg) groups. The numbers of hematocytes and bone marrow cells were measured for 21 days after sublethal 4 Gy gamma-ray irradiation with per os of 4 mg/kg of PQQ. The recovery of white blood cells, reticulocytes and bone marrow cells in the irradiation + PQQ group was faster than that in the irradiation group. Furthermore, the recovery of bone marrow cell in the irradiation + PQQ group was superior to that in irradiation + nilestriol group. Our results clearly indicate favourable effects on survival under higher lethal radiation doses and the ability of pyrroloquinoline quinine to enhance haemopoietic recovery after sublethal radiation exposure

中国物理海洋学研究70年：发展历程、学术成就概览

本文概略评述新中国成立70年来物理海洋学各分支研究领域的发展历程和若干学术成就。中国物理海洋学研究起步于海浪、潮汐、近海环流与水团,以及以风暴潮为主的海洋气象灾害的研究。随着国力的增强,研究领域不断拓展,涌现了大量具有广泛影响力的研究成果,其中包括:提出了被国际广泛采用的"普遍风浪谱"和"涌浪谱",发展了第三代海浪数值模式;提出了"准调和分析方法"和"潮汐潮流永久预报"等潮汐潮流的分析和预报方法;发现并命名了"棉兰老潜流",揭示了东海黑潮的多核结构及其多尺度变异机理等,系统描述了太平洋西边界流系;提出了印度尼西亚贯穿流的南海分支(或称南海贯穿流);不断完善了中国近海陆架环流系统,在南海环流、黑潮及其分支、台湾暖流、闽浙沿岸流、黄海冷水团环流、黄海暖流、渤海环流,以及陆架波方面均取得了深刻的认识;从大气桥和海洋桥两个方面对太平洋–印度洋–大西洋洋际相互作用进行了系统的总结;发展了浅海水团的研究方法,基本摸清了中国近海水团的分布和消长特征与机制,在大洋和极地水团分布及运动研究方面也做出了重要贡献;阐明了南海中尺度涡的宏观特征和生成机制,揭示了中尺度涡的三维结构,定量评估了其全球物质与能量输运能力;基本摸清了中国近海海洋锋的空间分布和季节变化特征,提出了地形、正压不稳定和斜压不稳定等锋面动力学机制;构建了"南海内波潜标观测网",实现了对内波生成–演变–消亡全过程机理的系统认识;发展了湍流的剪切不稳定理论,提出了海流"边缘不稳定"的概念,开发了海洋湍流模式,提出了湍流混合参数化的新方法等;在海洋内部混合机制和能量来源方面取得了新的认识,并阐述了混合对海洋深层环流、营养物质输运等过程的影响;研发了全球浪–潮–流耦合模式,推出一系列海洋与气候模式;发展了可同化主要海洋观测数据的海洋数据同化系统和用于ENSO预报的耦合同化系统;建立了达到国际水准的非地转(水槽/水池)和地转(旋转平台)物理模型实验平台;发展了ENSO预报的误差分析方法,建立了海洋和气候系统年代际变化的理论体系,揭示了中深层海洋对全球气候变化的响应;初步建成了中国近海海洋观测网;持续开展南北极调查研究;建立了台风、风暴潮、巨浪和海啸的业务化预报系统,为中国气象减灾提供保障;突破了国外的海洋技术封锁,研发了万米水深的深水水听器和海洋光学特性系列测量仪器;建立了溢油、危险化学品漂移扩散等预测模型,为伴随海洋资源开发所带来的风险事故的应急处理和预警预报提供科学支撑。文中引用的大量学术成果文献(每位第一作者优选不超过3篇)显示,经过70年的发展,中国物理海洋学研究培养了一支实力雄厚的科研队伍,这是最宝贵的成果。这支队伍必将成为中国物理海洋学研究攀登新高峰的主力军

等离子喷涂氧化铝-碳纤维复合涂层的结构及耐磨性能

采用机械球磨方法制备了短线碳纤维，并与氧化铝粉末充分混合，利用等离子喷涂工艺制备了碳纤维质量分数为4％的复合涂层。利用场发射扫描电镜、拉曼光谱、X射线衍射、拉伸试验、摩擦磨 损试验等对复合涂层的结构和性能进行了表征和测试分析。结果表明，碳纤维在等离子喷涂过程中较好地保持了原有结构和形貌，主要存在于氧化铝扁平粒子界面，碳纤维的加入使氧化铝涂层与基体之间的结合强度增加了38％，复合涂层耐磨性能比纯氧化铝涂层提高了64％，摩擦因数降低了50％。涂层耐磨性能的改善主要归功于参与磨损的碳纤维本身优异的润滑性能及其对氧化铝扁平粒子界面的结合作用，该复合涂层在低载荷摩擦磨损环境中具有潜在的应用价值

Research on Issue of Taxation Resource Administration

过去的近五、六年来，我们一直在思考着税收收入高速增长的问题。在试图解释税收收入不断超经济增长时，主流观点是将其归因于税收制度、税收政策和税收征管三个主要因素共同作用的结果。从理论上讲，无论税收制度、税收政策多么地完美，税收征管多么地有效，税收收入归根到底只能源于GDP，不可能超越GDP，因而，这种解释好象无法完美地把问题描述清楚。我认为真正有意思的问题不是税收收入为什么会超经济增长，而是应该提出这样一个问题：在中国，税收收入究竟源于何处，即税源之所在，更为重要的是如何开展卓有成效的税源管理活动。 从20世纪80年代以来，以“低税率、宽税基、少减免、严征管”为指导思想的税制改革席卷全球，同时“...In the past five or six years we have been always thinking about the reason of the rapid growth of revenue in China. When trying to explain why taxation growth kept overtaking the economy growth, the mainstream view attributes the phenomenon to the tax system, tax policy as well as tax administration. Theoretically, tax revenue is derived from GDP and cannot overtake GDP no matter how perfect the ...学位：经济学博士院系专业：经济学院财政金融系_财政学(含税收学)学号：B20011200