1,614 research outputs found

    Preparation and Characteristic of Nano-Kaolinite and Application in Ultrafiltration Membrane

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    纳米高岭土作为添加材料具有易于分散并能发生纳米效应的优势,在水处理、材料制备等诸多领域具有广阔的应用前景;因此,它的制备也就成为一个研究热点。插层剥离法被认为是目前制备纳米高岭土的最有效方法。本课题首先由二甲亚砜(DMSO)实现对高岭石的插层反应;继通过甲醇(MeOH)和苄基三甲基氯化铵(TMBAC)置换高岭石层间的DMSO。有机分子插入高岭石层间之后,破坏了高岭石层间固有的氢键,撑大了其层间间距;最后再经过热处理令这些处于高岭石层间的有机分子发生脱嵌作用,导致高岭石层与层的相互剥离,从而制得纳米高岭土薄片;研究了插层反应机理以及插层复合物剥离前后高岭土的结构特征;同时,探讨了...Nano-kaolinite, as a kind of additive with advantages of nanoeffect and good dispersibility, has broad application prospects on many fields such as water treatment and materials preparation, etc. Therefore, the preparation of nano-kaolinite has become a hot subject. Currently, the most effective preparation method of nano-kaolinite is displacement intercalationexfoliation method. I...学位:工学硕士院系专业:材料学院_工程硕士(材料工程)学号:2072013115009

    The role of Rip3-mediated necrosis in system inflammatory response syndrome

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    肿瘤坏死因子-α可以诱导小鼠发生全身免疫反应综合征,其过程中发生了各组织器官的坏死和一系列级联免疫反应。在肿瘤坏死因子-α的作用下,组织细胞中的受体相互作用蛋白3被激活并募集坏死小体,导致细胞坏死,引起周围组织的炎症反应。同时,肿瘤坏死因子-α本身作为促炎因子扩大了机体免疫反应的范围。在肿瘤坏死因子-α诱导的全身免疫反应综合征中,盲肠首先表现出损伤,并且这种损伤可以被Rip3基因敲除所抑制。本论文通过建立小鼠盲肠切除术模型,与肿瘤坏死因子-α诱导全身免疫反应综合征模型并用,发现盲肠组织直接参与促进了全身免疫反应综合征的进程,并且这种作用与盲肠组织本身的免疫功能无关。同时,Rip3基因直接参与了...TNF-α can induce mice system inflammatory response syndrome(SIRS), which include multiple organ necrosis and a cascade of immune response. In the present of TNF-α, Rip3 activated in tissue cells and recruited necrosome, which induced cell necrosis then cause inflammatory around. Besides, TNF-α as a pro-inflammatory factor promoted the range of inflammation in the body. In the model of TNF-α induce...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:2162013115259

    The Determinants of Chinese Enterprises Overseas Mergers&Acquisitions Equity Strategy

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    随着中国企业“走出去”步伐的不断加快,跨国并购逐步发展成为我国对外直接投资的主要方式,2014年中国企业海外并购总金额占到我国对外直接投资近乎一半。中国企业海外并购呈现出持续增长、向发达国家集中、从横向并购转向多元化并购以及民营企业逐步发展成为中国海外并购主力的趋势。中国企业的股权策略也越来越倾向选择高控制进入,中国企业海外并购股权策略是如何决定的,影响中国企业海外并购股权策略的因素分析将是本文主要研究的问题。 本文的理论框架建立在TCA(交易成本分析)理论基础上,通过总结归纳相关理论研究,构建4个企业层面的因素:并购方企业的R&D投入强度、并购方企业规模、并购标的企业规模和并购方企业的国际...With the pace of Chinese enterprises “going out”accelerating, Chinese overseas Merger&Acquisitions (M&A) gradually developed into the main way of Chinese FDI(Foreign Direct Investment),the total amount of Chinese enterprises overseas M&A of 2014 accounted for nearly half of China's FDI. Chinese enterprises overseasM&A has been showing a sustained growth, focusing on developed countries and areas, ...学位:经济学硕士院系专业:经济学院_国际商务硕士学号:1572013115198

    Design and Implementation of Hotel Room Management System

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    现代交通工具的日益发达,人们生活物质水平的不断提高,工作出差、度假旅游也成为热点,宾馆已逐步承担起人民生活中不可或缺的重要角色。随着宾馆住宿人数的不断增加,宾馆的业务更加繁忙,工作量也逐渐加大。传统的人工管理方法存在着很多弊端:事务繁多、工作效率低;浪费人力物力财力;管理容易出现错误和混乱;难以提供决策的依据,难以提升宾馆的知名度和现代化形象。以往由人工进行管理的模式已不能满足现在消费者的需要,也没办法与高效、快速地处理经营中产生的大量信息数据的需要匹配。开发宾馆客房管理系统,提高宾馆服务质量和管理水平,提高宾馆的管理效率,有十分积极的现实意义和应用价值。 本文从宾馆客房管理的实际需要,对宾...With the development of modern vehicles and improvement of people's living, business trip and vacation travel has become a hot spot, hotel has became increasingly indispensable component in people's lives. With the increasing number of hotel accommodation, the hotel business is more and more busy and the workload is gradually increasing. There are many drawbacks of traditional manual management me...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323005

    Agglomeration or dispersal the spatial behavior of sex-oriented industry in Hong Kong /

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    Thesis (B.Sc)--University of Hong Kong, 2005.published_or_final_versio

    甘孜地热发电热力计算及优化

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    A geothermal well in Ganzi was chosen for the study. To provide a reference for the design and construc?tion of a geothermal plant, power generation techniques were selected and the thermodynamic process was calculat?ed based on cold and heat source dat

    Controllable Preparation and Energy storage Properties of Co3O4-based nanocomposites

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    近些年,我国开发和存储绿色能源,研究其有效转化技术迫在眉睫。过渡金属氧化物作为负极材料,具有价格低廉,性能优异和可设计性强等优点备受关注。同时,金属有机框架由于拥有高比表面积和孔隙率,形态和结构可调控,被认为是合成负极材料的理想前驱体。因此,本文研究了Co3O4基纳米材料,制备了Co3O4@rGO纳米复合材料,同时在MOFs衍生的结构上,探究其所形成的具有异质结结构的Co3O4/ZnFe2O4/C纳米复合材料形貌。主要完成了如下工作: 1、溶剂热法制备Co3O4和Co3O4@rGO纳米复合材料及电化学性能测试。 采用溶剂热法制备了原子薄度的Co3O4纳米片,并且以十六烷基三甲基溴化铵(CT...Recently, the development of clean energy, storage and transformation technology research is particularly urgent in China. It is found that those transition metal oxides as negative materials can be designed and have other valuable advantages such as the low price and excellent performance. At the same time, the metal organic framework (MOFs) is an excellent precursor to synthesis anode materials ...学位:工程硕士院系专业:材料学院_工程硕士(材料工程)学号:2072014115010

    Fauna and distribution of Testacea (Protozoa) from Arctic, Antarctic and Tibet

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    野生动物多样性是生物多样性监测与保护管理评价的关键指标,因此对野生动物进行长期监测是中国森林生物多样性监测网络(CForBio)等大尺度生物多样性监测研究计划的一个重要组成部分.2011年以来,CForBio网络陆续在多个森林动态监测样地开展以红外相机来监测野生动物多样性.随着我国野生动物红外相机监测网络的初步形成,亟待建立和执行基于红外相机技术的统一监测规范.基于3年来在我国森林动态监测样地红外相机监测的进展情况,以及热带生态评价与监测网络针对陆生脊椎动物(兽类和鸟类)所提出的红外相机监测规范,本文从监测规范和监测注意事项等方面探讨了我国森林野生动物红外相机监测的现状和未来.中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)06704-7112
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