6,642 research outputs found

    A Study of Influences of Age Structure Change on the Economic Growth in Southeast Asia Countries

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    不同年龄段人口的经济行为具有异质性,少儿人口、劳动年龄人口和老年人口的生产行为、消费行为和储蓄行为等都存在很大差异。人口年龄结构变动必然会通过一系列中介变量来最终影响经济增长。一个国家或地区的人口年龄结构属于幼年型、成年型还是老年型,与这个国家的经济增长密切相关。二战后,暴增的人口给东南亚各国经济和社会发展造成很大阻碍,为了抑制激增的人口速度,从20世纪后半叶开始,东南亚各国相继推行人口政策,人口出生率急剧下降、劳动年龄人口比重逐渐增加、劳动力人口抚养负担不断减轻,陆续迎来了人口结构的“黄金时期”。目前,对东南亚国家人口年龄结构变动与经济增长的全面系统研究较少,特别是人口老龄化对经济增长影响方...Different age paragraph the behaviors of population have heterogeneity, children、working age and elderly population production behavior, consumer behavior and saving behaviour is a big difference. Population age structure changes will through a series of mediation variables to finally affect economic growth. A country or a region of the population age structure type belongs to the youth, adult or ...学位:经济学博士院系专业:南洋研究院_世界经济学号:2552013015401

    Response of Avicennia marina rhizosphere to arsenic stress and arsenic accumulation and distribution in plants

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    红树林是生长在热带、亚热带河口海湾地区的木本植物群落,具有极高的生态价值和经济价值,但红树林湿地由于其独特的生境特征及强烈的人为干扰,面临着日益严重的重金属污染问题。其中,砷(As)由于具有强烈的致癌作用且影响植物正常新陈代谢,成为近几年红树林污染生态学研究的重要内容。目前,红树林As污染的研究主要集中于As在红树林湿地系统中的空间分布、生态风险评估以及As在沉积物中的赋存状态三个方面,有关As胁迫下红树植物的响应机制及红树植物生长对沉积环境中As迁移转化的影响鲜有报道。本研究以我国常见先锋红树植物白骨壤为试材,以砷为研究对象,通过营养液栽培、根系模拟栽培和吸附试验相结合的方法,开展红树植物根...Mangroves, the intertidal wetlands confined to tropical and subtropical coastlines, are possess quite a lot of ecological functions. However, the heavy metal pollution in mangrove ecosystem is becoming more and more serious, due to its unique habitat characteristics and strong human disturbance. In which arsenic is a strong carcinogen and a non-essential nutrient element. Excessive arsenic can cau...学位:理学硕士院系专业:环境与生态学院_生态学学号:3332013115170

    A Study on the Application of Visual Rhetoric in print PSAs:An Empirical Analysis Based on Welovead Advertising Database

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    视觉修辞是一种通过对图像、文字等视觉元素的修饰与组合提高作品表现力的修辞手法。恰当地运用视觉修辞能赋予广告更深刻的含义,使之能精准地表达广告主题,增强广告的传播力与视觉诱导力,更好地实现广告劝服功能。平面公益广告具有唤起公众意识、引导社会价值观、传播精神文明的重要作用,在现代社会扮演着越来越重要的角色。当前社会上存在大量平面公益广告作品因为没有合理运用视觉修辞而导致广告内容平淡乏味。因此本文拟通过对平面广告视觉修辞理论的梳理和优秀平面公益广告作品的实证分析,探索和总结平面公益广告的视觉修辞运用规律,以期对平面公益广告创作有所补益。 文章分为理论研究、实证研究两个部分。 理论部分,文章通过对...Visual rhetoric is an art-creating technique used to improve works’ visual representation,in a way of modifying the image and text or adjusting their relationship in a work . An appropriate use of visual rhetoric make much benefits in making advertising images more meaningful, clearing the theme ,in order to achieve a better persuasion. Print PSAs play an important role in modern society which mak...学位:文学硕士院系专业:新闻传播学院_新闻与传播硕士学号:3362013115301

    Research on Risk-oriented Internal Audit in Private Colleges--Y College as an Example

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    受宏观政策推动、市场准入机制开放、教育产业资本化进程加速等多重因素的影响,民办高等院校的经营环境不断发生变化,经营风险和管理风险日益复杂,而做为民办高校经营实体风险防范最基本应对工具内审部门所需面对的内部压力和外部压力也日益增长。与此同时,民办高校内部审计部门做为日常经营管理工作中的重要一环,其内在涵义和外在延伸在不断扩展与丰富,传统审计模式下的常规审计在运作模式的效益性和运作结果的效率性等方面已显然不能满足管理需要。因此,在民办高校内部审计中创新性的运用风险导向审计方法必将是符合时代发展的必然需要和大势所趋。 本文在充分研究国内外文献资料的基础上,将前沿理论与具体案例结合分析,研究风险导向...Arising from the influence of multiple factors which include macroeconomic policy impetus, market access mechanism opening, accelerating the process of capitalization of education, the operating environment of private college is changing constantly, the operating risks and management risks are becoming more and more complex, consequently, the pressure on internal audit department who acts as the m...学位:会计硕士院系专业:管理学院_会计硕士学号:X200915702

    The PERK Pathway Regulates Yap Transcription during Unfolded Protein Response

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    Hippo信号通路是近年来在果蝇体内发现的一条进化上高度保守的信号转导通路,该通路对控制组织器官大小以及细胞增殖、凋亡有着重要的调节作用。Yap是Hippo信号通路主要的效应分子,Hippo通路的缺失造成Yap的激活,细胞增殖增加,凋亡减少,从而导致器官增大以及肿瘤发生。Hippo通路通过一系列磷酸化级联反应来调控Yap的磷酸化、降解和细胞核定位,从而实现抑制Yap的促癌功能。探索Yap的调控机制有着重大意义,在本项目研究中我们发现内质网应激能够在转录水平调控Yap。 内质网应激是真核细胞的一种保护性应激反应,当内质网中有大量未折叠蛋白积累时可触发该应激反应,通过激活一系列通路,减少蛋白质的...The Hippo signaling pathway was initially discovered in Drosophila melanogaster, which is an evolutionary conserved signal transduction pathway. This pathway controls organ size by regulating cell proliferation and apoptosis. Yap is the important effector molecule of the Hippo signaling pathway. The loss of any component upstream of this pathway results in the activation of Yap, increase in prolif...学位:理学硕士院系专业:生命科学学院_生物学学号:2162012115240

    The study of Mitochondrial DNA Gene Rearrangement in 4 species of birds(Aves: Falconiformes)

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    线粒体控制区由于进化速率快,被作为分子标记广泛应用于种群遗传学和保护生物学等领域的研究。但最近在许多鸟类的线粒体中都发现控制区存在重复拷贝,并且2个控制区拷贝之间的碱基相似度较高。因此在扩增其中一个控制区基因时可能受到另一个控制区的干扰,而对研究结果产生影响。本研究主要针对隼形目鸟类线粒体DNA(mtDNA)基因组中控制区重复及由此产生的基因重排现象进行研究,初步探讨控制区重复和基因重排产生的过程和机制。 本次实验首次对鹰科中的白头鹞(Circusaeruginosus)、日本松雀鹰(Accipitergularis)、黑翅鸢(Elanuscaeruleus)和凤头鹰(Accipitertr...Because of the rapid evolutionary rate, mitochondrial control region is used as a molecular marker, and widely used on research in field of population genetics and conservation biology. However, there are two control regions in the mitochondrial DNA of birds, and the nucleotide similarity between duplicated control regions is high. So when we amplificate one control region, may be another one will...学位:理学硕士院系专业:环境与生态学院_生态学学号:3332013115170

    Studies on Direct Vinylation of α, β-Sec-Amides with Potassium Organotrifluoroborate and the Cascade of an Imino Nazarov Reaction: One-Pot access to Polysubstituted Cyclopent-2-enimines

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    多取代环戊基胺是许多具有生物性或药理功能的天然产物的骨架结构。经典的Nazarov环化反应通过戊二烯基阳离子发生4π电环化,是合成五元碳环最重要的方法之一。但以戊二烯亚胺为底物的4π电环化反应,即亚胺型Nazarov反应,至今尚未被系统研究过,是极具挑战性的课题。本论文直接从仲酰胺出发在本实验室前期发展的酰胺活化形成碳-碳键方法学基础上利用仲酰胺与有机三氟硼酸钾发生亲核加成反应并串联亚胺纳扎罗夫反应“一锅法”合成多取代环戊烯亚胺类化合物。主要取得的结果如下:1、以α,β-不饱和仲酰胺为底物与有机三氟硼酸钾反应制备了一系列3-亚胺-1,4-戊二烯类化合物。2、以,...Polysubstituted cyclopentylamines scaffolds are ubiquitous in both natural products and biologically important molecules. The classical Nazarov reaction through a conrotatory 4π-electron electrocyclic ring closure of a pentadienyl cation is one of the most important protocol to construct these skeletons. However, the study of Imino-Nazarov cyclization, which features electrocyclic ring closure of ...学位:理学硕士院系专业:化学化工学院_有机化学学号:2052014115154

    Study on the relationship between red meat, dietary Neu5Gc intake and anti-Neu5Gc antibody

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    唾液酸类化合物是以九碳糖神经氨酸(5-amino-3,5-dideoxy-D-glycero-D-galactononulsonicacid)为基本结构的一族衍生物的总称。目前,已分离和鉴定的有50余种,包括N-乙酰基神经氨酸(N-acetylneuraminicacid,Neu5Ac)、N-羟乙酰基神经氨酸(N-glycoulylneuraminicacid,Neu5Gc)和2-酮基-3-脱氧九酮糖酸(2-keto-3-deoxy-nonulosonicacid,KDN)三种核心单体,其余的唾液酸均由这三种单体衍生而来。在人体组织中发现的唾液酸主要是Neu5Ac,Neu5Gc是Neu5Ac的...Sialic acids (Sias) are a group of nine carbon monosaccharides with 5-amino-3,5-dideoxy-D-glycero-D-galactononulsonic acid as basic structure. At present, there are more than 50 kinds of Sia have been isolated and identified, among which are N-acetylneuraminic acid, N-glycoulylneuraminic acid and 2-keto-3-deoxy-nonulosonic acid, the three kinds of main monomer from which other Sias derive. Neu5Ac ...学位:医学硕士院系专业:公共卫生学院_营养与食品卫生学学号:3262012115053

    Design and Implementation of Examination System Based on .NET Structure

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    随着医疗体制的深入改革和发展,计算机网络技术的不断普及,以及信息化在全市各大医院的深度应用,很多医院正在逐步向规模化、集团化和网络化方向发展。由于集团化医院具有院区分散,职工数量多,职工层次不均等显著的特点,如何对集团医院的职工进行理论和业务能力考核,是我们现在必须面临的新课题。传统的考试方式需要把分散在集团医院的各分院的职工集中到一起再考试,效率低下,成本高昂,显然已经不适应现代化医院管理的需求,因此设计开发基于网络的医院考试管理系统是当前各医院各部门的迫切要求,同时在一定程度上改善医院行政管理的效率,提高考试管理的质量,对医院的全面提升奠定了良好的基础。 本文首先介绍了开发网络考试系统所...With the deepening reform and development of medical system, computer network technology becoming more and more popular, information technology being applied into the city's major hospitals more and more maturely, many hospitals are gradually on the way to be large-scaled, group-organized and net-working. Because the group hospital has the following two obvious characteristics, that is, scatterin...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323176

    Research of Opto-electronic Integrated Receiver in Industrial Control for POF Communication

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    随着经济的飞速发展,传统的手工生产方式正逐步被自动化的生产方式取代。工人仅操作控制面板,将生产指令经传输媒介传达至自动化设备末端进行生产的方式是大势所趋。作为传输指令的载体,采用传统的铜线进行传输已无法确保数据完整性及工业精准度。符合“光进铜退”环保政策的新兴材料——塑料光纤(PlasticOpticalFiber,POF)因具有优异的电磁抗扰性和易接续、低成本的特性,日渐广泛的应用在工业控制、车载网络、音频数据传输等各种短距离通信领域。工业控制中,POF的使用可以隔离共模电压,抑制接地回路噪声和共模噪声,消除电火花产生的可能,从而在大噪声和高共模电压的环境下保证了设备的安全性和数据的完整性。...With the rapid economic development, traditional manual production is gradually replaced by the automation one, which means that production orders can be conveyed from the control system to automatic equipment through the communication medium. As a traditional communication medium,opper wires can’t be able to ensure data integrity and industrial precision. As an ideal communication medium, plastic...学位:工学硕士院系专业:物理与机电工程学院_精密仪器及机械学号:1992012115274
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