4,253 research outputs found

    Geographical Variation in Vegetative Growth and Sexual Reproduction of the Invasive Spartina alterniflora

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    生物入侵是全球变化的重要内容,对全球经济和环境产生严重影响,并威胁生态系统的多样性。明确生物入侵发生的过程和机制可以有效地防控入侵生物带来的危害。繁殖是入侵种从定居到其后扩张过程中的一个重要的内在因素,进而可能影响入侵的成功。在入侵种扩散并占据广阔的地理分布区过程中,表型可塑性可能起到关键作用。揭示入侵种繁殖和表型可塑性在变异及其与环境因子的相关关系,对阐明外来物种的入侵机制和预测其分布具有重要的意义。互花米草原产美国大西洋沿岸和墨西哥湾,于1979年从美国引入中国。经过30多年的入侵和扩散,互花米草已经分布到除海南岛之外的沿海各省,南北跨19个纬度。目前,对于中国海岸带不同地理种群的互花米草...Biological invasions are recognized as a significant component of global change, acting as a major threat to the economy, environment and biodiversity of ecosystems worldwide. Making clear of the process and mechanism of biological invasioncan help to control the biological invasion effectively. The reproduction is a critical factor in a plant’s ability of colonization and establishment, which may...学位:理学硕士院系专业:生命科学学院_植物学学号:2162012115246

    Gene structure analysis and differentially splicing between Plasmodium yoelii subspecies

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    啮齿类动物约氏疟原虫(Plasmodiumyoelii)是研究宿主-寄生虫相互关系和疟原虫病理分子基础的一种重要的动物模型。尽管约氏疟原虫YM虫株的基本基因组信息已被测定,在最近也有许多啮齿类动物疟原虫的RNA-seq序列信息已见报道,但不同疟原虫品系或者亚种之间可能存在基因编码区及mRNA转录结构上的差异。构建多种疟原虫品系和亚种的cDNA文库将有助于我们对疟原虫遗传模式和转录组结构的认识。 本研究,我们用约氏疟原虫NSM虫株有或无MQ药物压力的红内期原虫样本构建了两个cDNA文库并对其进行深度测序,获得转录组序列再与最近公布的YM虫株cDNA序列相比对,以检测编码区单核苷酸多态性(SNP...The rodent malaria parasite Plasmodium yoelii is an important animal model for studying host-parasite interaction and molecular basis of malaria pathogenesis. Although a draft genome of P. yoelii yoelii YM is available, and RNA sequencing (RNA-seq) data for several rodent malaria species (RMP) were reported recently, variations in coding regions and structure of mRNA transcript are likely present ...学位:理学硕士院系专业:生命科学学院_动物学学号:2162013115247

    Design and Implementation of Financial Cashier Management System based on SSH

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    一个企业日常运营所需的资金流入与流出,以及企业的生存、发展、再发展的命脉,都是由出纳掌握并管理着。贵州某企业的出纳工作以往都是采用手工管理的方式,每笔都要用手工一笔一笔登记其日期、金额,而且还要编写摘要,这样不仅工作量大,而且效率非常低。尤其是近几年来,我国信息产业得到迅速发展,在有大量事务需要处理的应用中,如银行帐管理等,使用手工管理方式显然已经不适合了,制定一套适于自己需求的企业出纳管理系统刻不容缓。 贵州某企业出纳管理系统针对企业自身的现状进行需求分析,采用UML建模工具对需求分析进行建模;根据需求进行了系统的设计并进行系统的开发,对于实现了的系统功能进行测试。本系统主要分为五个功能模...The cash’s inflows and outflows of daily enterprise fund and the lifeblood of enterprise survival and development are held by the cashier. Cashier work in an enterprises in Guizhou is managed by manual work. Not only the date and cash amount of expenditure but also the abstract is registered by cashier. It leads to heavy work and low efficiency. With the rapid development of information industry, ...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323010

    Shared Auditors’ Influence on Mergers and Acquisitions of Listed Companies——Empirical Evidence from China A-share Listed Companies

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    我国资本市场的并购重组在20世纪90年代成为经济活动中的重要组成部分,其中1993年“宝延风波”正式拉开了新中国资本市场并购重组的帷幕。自此,并购重组逐渐成为我国企业寻求外部增长和规模扩张的重要方式之一,促进着我国资本市场的快速发展。 上市公司并购重组的专业化和高风险业务特征要求其运作过程中必须有投资银行、会计师事务所等中介机构的参与,以弥补其因自身结构性缺陷导致的先天不足。其中,会计师事务所作为并购重组交易双方的服务机构,参与整个交易流程,无论是基于职业素养还是基于制度约束,都能够在并购重组交易中发挥重要职能。但国内外已有的相关文献多是从单个交易对象研究审计师对并购重组的影响,对并购重组交...M&A of China’s capital market has become an important part of the economic activity in China since the 1990s, and “Baoyan Storm” in 1993 formally opened the curtain of M&A of China’s capital market. Since then, M&A has gradually become an important way for enterprises to seek external growth and scale expansion, promoting the rapid development of China’s capital market. In order to make u...学位:管理学硕士院系专业:管理学院_会计学学号:1752013115115

    Functions and associated mechanisms of Human tumor necrosis factor-alpha-induced protein 8 family during gastric cancer carcinogenesis

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    胃癌是消化系统最常见的恶性肿瘤,在世界范围内,胃癌的发病率居恶性肿瘤的第四位,死亡率居恶性肿瘤的第二位。胃癌发生、发展涉及多因素、多步骤、多基因参与的复杂过程,迄今为止,胃癌的病因和发病机制尚未完全阐明。因此,对胃癌发病机制、在不同分子途径在肿瘤发生发展中的作用机制的研究,寻找特异性的生物标志分子,对于早期发现胃癌和探寻新的治疗方法,进而提高胃癌患者生存率和提升生活质量具有重要意义。 TNFAIP8家族是由肿瘤坏死因子α诱导产生的一个蛋白质家族,参与多种生物学过程,并在许多疾病特别是自身免疫性疾病和肿瘤的发生、发展中发挥重要的作用,TNFAIP8、TIPE2、TIPE3是其中的重要成员。TN...Gastric cancer(GC) is a leading cause of global cancer mortality responsible for 700000 deaths annually, and still highly prevalent in many parts of Asia, Eastern Europe and South America. Most patients with GC are diagnosed at advanced disease stages, and overall 5-year survival rates for patients with resectable GC remain low at 10-30% despite clinical advances in surgery and therapy.The elucida...学位:理学博士院系专业:医学院_生理学学号:2452013015431

    Research on Japanese Lay Judge System

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    本文从理论与实践相结合的角度切入,对日本陪审制度历史发展进行梳理,对日本现行裁判员法的具体内容进行分析,同时对比我国当下的人民陪审员制度的现状,以探讨我国国情的人民参与司法的借鉴。本文所采用文献分析、数据导览以及比较的方法。本文主要分为五章: 第一章梳理日本司法民主化的历史进程,并将其作为现行日本裁判员法施行的历史背景。通过了解日本从明治维新开始初步尝试、到大正时代的陪审制度正式引进以及战后的再启动,最终理解现行裁判员法一脉相传的精神。 第二章对日本裁判员法中的具体制度和主要内容进行介绍。主要从裁判员法的制定过程、裁判员制度的适用范围、裁判员的职权与义务、裁判员的任职资格、裁判员的选任和解...This thesis, from the prespective of combining theory and practice, teases the historical path of Japanese jury system, elaborates the specific content of the current lay judge law in Japan, compares the present situation of the current people’s jury system in China, and strives to find the way of people’s participation in judicature, which is conformable to Chinese condition. This thesis uses met...学位:法学硕士院系专业:法学院_法律史学号:1362015115091

    Fabrication,properties and applications of the periodic plasmonic structures based on holographic lithography technique

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    表面等离激元结构与入射光波发生相互作用,即发生表面等离激元共振(surfaceplasmonresonance,SPR)作用时,伴随着局域电磁场的增强和对光在低于衍射极限尺度上的束缚。因此被广泛的用于表面增强光谱、生物化学传感、太阳能光伏器件、光催化等领域。其中表面增强的拉曼光谱(surface-enhancedRamanspectroscopy,SERS)和生物化学传感器(bio-chemicalsensor)是SPR现象的两个最主要的应用途径。由于表面等离激元共振现象具有极强的结构相关性,所以根据不同的应用途径来设计最优化的表面等离激元结构已经成为了一个重要的研究方向。这其中有三个核心问题...Surface plasmons (SPs) are collective excitation of free conductive electrons on noble metal thin films or nanoparticle surfaces excited by electromagnetic radiation at the metal-dielectric interface. The study of the interaction between light and metallic nanostructures is a rapidly emerging research area known as plasmonics, which is the branch of the nanophotonics field. Plasmonic nanostructure...学位:理学博士院系专业:化学化工学院_分析化学学号:2052011015370

    Study on the expansion strategy and strategic optimization of Zijin Mining

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    紫金矿业集团股份有限公司(简称:“公司”)从1993年开发紫金山金矿正式起步,经过20多年的发展,已成为一家以黄金及金属矿产资源勘查和开发为主的大型跨国矿业集团。公司通过实施扩张战略取得了丰硕成果,进行经验总结是必要的。现公司正积极推进国际化,但也存在诸多不足地方,应进行扩张战略优化研究。本文对紫金矿业实施扩张战略的成功案例的理论研究和实践应用分析,将为企业和同行业的扩张发展起到极其重要的理论意义、实践意义和现实意义,并提供借鉴作用。 本文在了解公司发展历程基础上,分析了扩张战略定位、选择和目标,以及实施扩张战略的保障。重点研究的公司成功实施扩张战略的举措中,原始积累获得、矿产资源占有、资本...Zijin Mining Group Co (hereinafter referred to as the "company") , officially started in 1993 by the development and exploitation of Zijinshan Gold Mine, has become a large-scale multinational mining group based on the exploration and development of gold and metal mineral resources after over 20 years of development. The company has achieved fruitful results through the implementation of the expan...学位:工商管理硕士院系专业:管理学院_工商管理硕士(高级管理人员工商管理硕士)学号:X201215621

    Controllable Preparation and Performance Study of Graphene and Graphene-based Nanocomposites

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    石墨烯是一种具有单原子厚度的二维碳材料,独特的结构赋予其在电学、力学、热学及光学等方面非常优异的物化特性,加上其非常高的理论比表面积,使得石墨烯在众多领域都有着广泛的应用前景,包括场效应晶体管、太阳能电池、锂离子电池、超级电容器、催化、传感、生物医药及高分子材料等方面。本论文从氧化石墨烯(GO)出发,围绕着石墨烯及其复合材料的可控制备和性能研究开展了一系列研究工作,主要内容如下: (1)氧化石墨烯的还原和烷基化及其产物的储能性能研究:利用锂-萘-四氢呋喃溶液体系产生的溶剂化电子还原氧化石墨烯,该还原法在常温下就可进行,能很大程度上恢复石墨烯的导电性,且不会引入杂原子。通过可控的烷基化反应成功...Graphene is a kind of two-dimensional carbon material with only one atom thickness. The unique structure endows it the excellent electrical, mechanical, thermal and optical properties, also with the largest theoretical specific surface area of 2630 m2/g. Thus, graphene could be used in many areas, including field effect transistors, solar cells, lithium ion battery, supercapacitor, catalysis, sens...学位:理学博士院系专业:化学化工学院_无机化学学号:2052012015349

    Gas Sensing Research Based on the Tungsten Oxide Hierarchical Structure Materials

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    现如今在时代进步、生活富裕和科技发展的同时,人们越发关注身边的环境安全以及自己的身心健康。传感技术、计算机技术和通讯技术构成现代科技的三大支柱,其中传感技术为通信系统、信息系统和自动化系统的准确信息采集提供了重要保障。气体传感器作为传感领域一条重要分支,在环境安全、大气检测、防灾报警和医疗诊断等方面具有广泛应用,能有效地监测各类危险气体所带来或所隐藏的安全隐患。 在气体传感领域,相对于ZnO和SnO2等传统的气敏材料,WO3作为较新一代的气敏材料,具有灵敏度高、稳定性好和使用寿命长等优点,但为了满足更高灵敏度以及低工作温度等需求,我们选择WO3作为基础气敏材料,进一步地对WO3半导体材料做了...Today with the era of progress, rich life and the development of science, people increasingly focus on the environment around security as well as their physical and mental health. Sensing technology, computer technology and communications technology constitute the three backbones of modern science and technology, and the sensing technology provides an important safeguard for accurate information c...学位:工学硕士院系专业:萨本栋微米纳米科学技术研究院_测试计量技术及仪器学号:3352014115241
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