1,401 research outputs found

    Numerical Analysis of the Time Fractional Black-Scholes Equation

    Get PDF
    时间分数阶Black-Scholes方程在期权定价中有着日益广泛的应用。本文旨在研究该方程的数值解法,构造和分析了两个有效算法。第一个算法结合了时间方向的有限差分和空间方向的谱方法;第二个方法则基于时空Galerkin谱方法。通过引入恰当的Sobolev空间,我们构建了时空变分问题,证明了时空弱问题的适定性。在算法分析方面,我们首先给出两种方法的最优误差估计。然后讨论算法实现技巧,通过选取适当的基函数导出离散问题的线性系统。最后给出一些数值例子验证理论结果。The time fractional Black-Scholes equation is playing increasingly important role in option pricing nowadays. In this paper we investigate the numerical solution of this equation,and propose and analyze two different methods for it. The first proposed method combines a finite difference scheme in time and spectral method in space; while the second one makes use of spectral approximation in both ti...学位:理学硕士院系专业:数学科学学院_计算数学学号:1902013115266

    Screen to identify the antiviral proteins and explore the effect of prostaglandin receptor

    Get PDF
    天然免疫反应为机体提供了对于病原微生物感染而进行反击的第一道防线,与人类的许多感染性及非感染性疾病密切相关。其中,I型干扰素(IFN-α/β)是病毒感染后产生的介导抗病毒反应的关键分子,介导了后续的先天免疫抗病毒反应。I型干扰素通过IFNR(interferonreceptor)-JAK/STAT的信号通路诱导激活下游数百个ISGs(interferon-stimulatedgenes)的表达。这些蛋白可以起到直接影响病毒吸附、脱壳、复制、包装和释放以及影响宿主细胞的生长和存活,从而达到广谱抗病毒的作用。虽然ISGs已经发现了超过25年,只有一些蛋白被报道具有抗病毒的作用,但是大部分干扰素诱导...The innate immunity is the first line of defense against microbial infection, which is related to infectious and noninfectious disease. Among them, the type-1 interferon(IFN-α/β) is an important cellular factors which can mediate the antiviral activity. The type-1 interferon stimulate the IFNR(interferon receptor)-JAK/STAT signal pathway and transcriptionally regulate hundreds of interferon-stimul...学位:理学硕士院系专业:生命科学学院_生物化学与分子生物学学号:2162014115254

    The Research on the Certain New Key Algorithms of License Plate Recognition System

    Get PDF
    随着信息技术和智能技术的发展,交通管理系统的信息化、智能化已成为发展的趋势。车牌识别系统(LicensePlateRecognition简称LPR)是智能交通系统(ITS)的核心组成部分,在现代交通管理系统中发挥着重要的作用。车牌识别是指通过计算机视觉、图像处理与模式识别等方法从机动车辆图像中提取车牌字符信息,从而确定车辆身份的技术,在公共安全、交通管理、流量观测、电子收费系统及有关军事部门等方面都有着广泛用途和良好的应用前景。 本文研究了车牌识别系统的三项关键技术:车牌图像的定位分割技术、车牌字符的切分技术和车牌字符的识别技术。车牌定位分割是整个车牌识别系统的基础和前提,直接关系到后续处理...With the development of information technology and intelligence technology, the informalization and intelligentizing of traffic management has already been the trend. License Plate Recognition system (LPR) is the core of the Intelligent Traffic System (ITS). And it plays an important role in modern traffic management systems. LPR is the technique to get the character information from vehicle image...学位:工学硕士院系专业:信息科学与技术学院计算机科学系_计算机应用技术学号:2212005130233

    Theoretical Study on Dealing with the “Middle Income Trap” in China

    Get PDF
    新中国60多年来取得了辉煌的成就,在2010年,我国已跃居世界第二大经济体,人均GDP已突破4000美元,正式步入了中等收入国家行列。然而,从世界各国的发展历程来看,迈入中等收入国家后国家的发展却呈现出两种完全不同的路径,一种通过调结构、提效率等方式成功实现转型,很快步入高收入国家行列;另一种却因种种矛盾和问题导致长期徘徊不前,陷入所谓的“中等收入陷阱”不可自拔。毫无疑问,受世界关注的中国别无选择,只能顺利迈过所谓的“中等收入陷阱”,继续创造“中国奇迹”。因此,我国如何通过调整结构继续保持快速发展,避免所谓的“中等收入陷阱”,成为影响我国可持续发展的重大问题。本文以马克思主义基本理论为指导,运...New China has made brilliant achievements for over 60 years .In 2010, China has leapt to the second largest economy in the world, China’s per capita GDP has exceeded 4,000 dollars, China has formally entered the ranks of middle-income countries. However, observing on the course of development from the world, the development of the country into the middle-income countries preached two completely di...学位:经济学博士院系专业:经济研究所_政治经济学学号:2902010015378

    Preparation of Polyclonal Antibody and Monoclonal Antibody against Human DcR3 and Establishment of Enzyme-linked Immunosorbent Assay

    Get PDF
    诱骗受体3(decoyreceptor3,DcR3,又称TR6或M68)是1998年PittiRM等发现的一种可溶性肿瘤坏死因子受体(TNFR)超家族成员,其互补脱氧核糖核苷酸(CompletementaryDeoxyribonucleicAcid,cDNA)开放阅读框共编码300个氨基酸,N端前29个氨基酸为信号肽序列,随后是四个半胱氨酸富集区(CRD),其分子量约35KD,有一个N糖基化位点。DcR3能与TNF家族成员:Fas配体(Fasligand,FasL)、LIGHT[(herpesvirusentrymediator(HVEM)-L]和TL1A竞争性地结合,并抑制其介导的细胞凋亡,...Decoy receptor 3, DcR3 (also known as TR6 and M68), a soluble protein, belongs to the tumor necrosis factor receptor (TNFR) superfamily and was identified by Pitti RM in 1998. The DcR3 mRNA contains one open reading frame which encodes 300 amino acids those of the first 29 constitutes the signal peptidesequence that is followed by four tandem cysteine-rich domains (CRDs). Its protein relative mole...学位:医学硕士院系专业:医学院临床医学系_肿瘤学学号:2452007115423

    Synthesis, Characterizations and Catalytic Performances of Ordered Mesoporous Alumina-Supported Cobalt Catalysts for Partial Oxidation of Methane to Syngas

    Get PDF
    本文以非离子表面活性剂为模板剂,采用溶胶-凝胶技术一步原位合成具有高度热稳定性、大比表面和有序介孔结构的氧化铝负载钴催化剂(Co-MA)。与浸渍法制备的介孔Al2O3和商品-Al2O3负载钴催化剂(Co/MA,Co/A)相比较,考察了不同催化剂的结构和甲烷部分氧化制合成气(POM)反应性能,研究了催化剂结构与性能之间的关系。 POM反应结果表明,不同催化剂的催化活性顺序为:Co-MA>>Co/MA>Co/A。其中,原位合成的Co-MA催化剂对POM反应表现出优异的催化活性和稳定性。在750℃、CH4/O2/Ar=2/1/4和GHSV=1.0×105mL•g-1&#...In this work, a highly ordered mesoporous alumina-supported cobalt catalyst (Co-MA) with high thermal stability and large surface area was in-situ synthesized through a sol-gel route with triblock copolymer as a structure directing agent. Comparing with ones prepared by impregnation using meso-Al2O3 and commercial -Al2O3 as carriers (Co/MA, Co/A), the catalysts were tested for partial oxid...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:2052007115096

    System of Scientific and Technological Transformation of Higher Educational Institutions in UK and Lessons Drawn from It

    Get PDF
    当前,科技成果的转化已成为世界各国共同关注的问题。高校作为重要的科研力量和国家创新体系的重要主体,其科技成果转化有力地推动了国家经济的发展,因而倍受重视。本论文即以英国高校科技成果转化体系为研究对象,梳理了该体系的基本结构,总结了英国高校科技成果转化体系的特点和其建立过程中的经验。进而针对我国高校科技成果转化存在的问题提出了对我国建立高校科技成果转化体系的几点启示。论文共分为五部分:序言中,对本论文的选题原因、相关研究现状、论文研究对象和研究思路等做了简要交代。第一章界定了“科技成果”、“科技成果转化”以及“科技成果转化体系”等概念;讨论了几种有关科技成果和科技成果转化体系的理论;并分析了科技...Nowadays, the scientific and technological transformation has attracted the most attention of every country. As higher education institutions have been the important scientific and technological research force and one of the most important forces of national innovation system, their scientific and technological transformation spurs the economic growth on effectively. This dissertation deals with t...学位:教育学硕士院系专业:教育研究院_高等教育学学号:20031700

    Design and Implementation of Office Automation System Based on B/S

    Get PDF
    随着计算机网络信息技术的飞速发展,利用计算机来处理各种信息的方法已经得到了广泛的应用,办公自动化系统逐渐受到企业和用户的关注,人们也纷纷感受到网络办公带来的便利和高效率的工作方式。办公自动化系统是为了提高企业内部办公管理水平,增强办公的协调性,提高企业的运作效率而建设的。企业的办公人员可以通过该系统实现网络办公,以满足企业业务及内部管理发展的需要。 本文主要研究基于B/S架构的办公自动化系统的设计与实现。采用RUP软件过程结合面向对象方法学,依托当前企业办公流程为背景,以用例为驱动的方式进行了详细的需求建模分析,并且本着良好的稳定性、实用性、适应性、可扩展性及平台化、层次化的原则,设计了合理...With the rapid development of computer network and information technology, using the computer to handle all kinds of information has a wide range of applications. The enterprises and the users have paid close attention to office automation system gradually, and more and more people have tried the convenienand and high effieiency working way that the Network Offiee brings. The aim of Office Automat...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201023023

    Researching of Hydrometallurgical Purification Process For Preparing Solar-Grade Silicon

    Get PDF
    太阳能是一种来源稳定、储量丰富、清洁无污染的可再生能源。随着能源需求的剧烈增加,太阳能的优势和发挥的作用已越来越明显。多晶硅作为光伏产业中的一种重要的基础原料,其材料成本的降低是推动光伏产业发展的重要动力。采用湿法冶金提纯制备太阳能级多晶硅具有设备简单、能耗低、周期短等优势。 本实验研究了太阳能级多晶硅中杂质在晶体表面和内部的分布特点,采用场发射扫描电子显微镜观察Si晶体在酸浸前后晶体表面形貌的变化情况。针对Si中杂质的不同属性,筛选了适宜的浸出剂,考察了浸出剂质量分数、温度、时间等工艺参数对杂质浸出率的影响。 实验表明:采用H2SO4-HF混合酸去除冶金级Si中的非金属杂质B的优化工艺条...Solar energy is a renewable stable sources of large reserves and non-pollution. As demand in energy increase dramatically, the superiority of solar energy has became more and more apparent. Polycrystalline silicon is the primary important material of pv industry. Reducing costs of materials is an significantl driving force to the photovoltaic industry. It’s little request on equipment, low cost ...学位:工程硕士院系专业:化学化工学院_化学工程学号:2062011115148

    Study on the Performance Optimization and Parametric Design for a Class of Irreversible Solar-Driven Heat Engines

    Get PDF
    塔式、碟式太阳能热机系统由于聚光比较大,集热器工作于较高温区,这时辐射热漏不可忽略。因此研究集热器辐射对流热损对太阳能热机系统性能特性的影响有其重要意义。另一方面,和其它太阳能热设备一样,太阳能热机首期投资成本较高,为了使所得到的太阳能在热机系统中产生最大化的经济效益,有必要研究太阳能热机系统的热经济优化性能。本硕士学位论文围绕集热器工作于高温区的几种太阳能热机系统性能展开研究,探索多种不可逆因素对一类太阳能热机系统总效率或热经济函数的影响。主要内容包括以下两方面: 第二章,建立包括集热器存在辐射对流热损,工质与热源间有限速率热传导,循环回热损失及循环工质内不可逆性等的太阳能Stirling...For a solar-driven heat engine with tower or dish style collector, its collector’s temperature is generally in high temperature region because it has a large concentrating ratio. In this case, the collector’s radiation heat leak can not be ignored. So, investigating the influence of radiation-convection heat leak of the solar collector on the performance characteristic of solar-driven heat engine ...学位:理学硕士院系专业:物理与机电工程学院物理学系_理论物理学号:1982008115298
    corecore