267 research outputs found

    Competitive Strategy Analysis of VR(China) Corp.

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    目前,中国的电工绝缘材料和电工制造装备行业竞争激励,VR(中国)公司要能够持久生存就必须全面筹划企业的竞争战略。 企业的经营战略决定企业的发展方向和经营目标的实现,本论文通过本人在VR(中国)公司的实际工作经历,对VR(中国)公司所处行业环境和行业特征以及企业的资源进行分析,选择战略方案,最终为VR(中国)公司制订一个可操作的、适应公司发展需要的竞争战略。 本文以相关的竞争战略基本理论为指导,来研究VR(中国)公司的竞争战略。首先介绍VR(中国)公司的基本情况,接着运用相关战略管理理论对其内外环境和资源进行分析,探索分析了VR(中国)公司的优势、劣势,面临的机遇和威胁,提出了 VR(中国)...The development of VR(China)Corp. denpends on its strategy . This thesis analyzes outside and inside resources of VR(China) Corp., makes a competitive strategy that adapts to development. Through my work experience in VR(China) Corp.,this text analyzes VR(China) Corp.’s advantages ,disadvantages, opportunities and threads . and VR(China) Corp. shall take necessary step to clarify and strengthen i...学位:工商管理硕士院系专业:管理学院工商管理教育中心(MBA中心)_工商管理硕士(MBA)学号:20031508

    重师博物馆匾额文本的女性、等级与宗族社会解读

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    匾额是中国传统文化的重要载体和组成部分,其隐藏着包罗万象的信息,具有重要的历史、艺术、文学等多学科的研究价值。本文试图从历史学的角度,试图透视重庆师范大学博物馆所藏匾额1中所隐含着的历史信息,主要围绕匾额中的女性、匾额中的等级关系以及匾额中的家庭与宗族三个主题进行解读,进一步彰显匾额的作用和价值

    Study on kinetics of propylene polymerizationat different temperatures via Monte Carlo simulation

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    在不考虑其他杂质参与聚合反应的情况下,并基于已有对丙烯聚合反应过程的普适化认识,提出了一个普适的丙烯聚合反应机理(基元反应).在已有的丙烯聚合反应机理基础上,为了证实该聚合反应过程总活性基是否满足“稳态假定”以及考察聚合反应温度对聚合过程的影响,采用蒙特卡罗模拟方法研究了传统Ziegler-Natta催化剂催化下的丙烯聚合动力学.模拟得到的总活性基数目在丙烯聚合初期快速增加到峰值,然后随聚合反应的进行保持恒定,证实了丙烯聚合过程中总活性基符合稳态假定.同时,模拟得到了聚合温度对丙烯聚合过程的转化率、分子量的影响.模拟结果表明:在聚合过程中,丙烯单体的消耗速率随聚合温度升高而增加;不同聚合温度下的数均聚合度峰值相同,但随温度增加,数均聚合度峰值来得早;随聚合温度增加,数均分子量减少,分子量分布变宽.The elementary reactions of propylene polymerization catalyzed by conventional Ziegler-Natta catalysts was proposed according to the comprehensive view and without considering the effect of any impurity in the material on propylene polymerization.The Monte Carlo simulation technique was employed to investigate the kinetics of propylene polymerization in order to determine the validity of the stationary state assumption and the effects of the polymerization temperature on the polymerization.The simulated total amount of active species,which only increases quickly at the beginning of the polymerization,indicates that the stationary state assumption in the studied system is valid.Moreover,significant effects of polymerization temperature on the polymerization conversion,and the molecular weight and its distribution were also analyzed.The simulated results show that the consumption rate of propylene increases with the increase of polymerization temperature;the maximum values of the number-average degree of polymerization are constant at different polymerization temperatures,however,the peak appears earlier with the higher temperature;as the polymerization temperature increases,the average molecular weight decreases and the molecular weight distribution changes greatly.The National Natural Science Foundation of China(No.20406016);; the Project of Fujian Petrochemical Company of SIN-OPEC (No.MS/FJ-08-JS-15-2005-01)

    The Geological Roles and Isotopic Responses of the Extremophiles in the Modern Ocean

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    围绕现代海洋极端环境条件下微生物分布特征和环境因子相互关系的研究在前期工作积累的基础上进行了更深入的分析,通过对北极冰川前沿和西南印度洋深海微生物资源的调查,初步了解了微生物群落结构的多样性及微生物的部分生态功能,为探索地质历史时期的微生物生命过程提供了良好的资源;发现西南印度洋深海微生物群落结构与钙、磷、硫等元素具有相关性,为揭示深海微生物的地球化学循环创造了条件;对深海环境铁还原菌的研究对探讨古海洋环境与生命的协同演化具有重要意义。开展了微生物对模拟环境条件如海洋酸化及火山爆发等地球历史时期的重大地质突变事件为背景,在现代海洋环境中进行了一系列的模拟研究,针对目前研究相对薄弱的环节,重点研究了海洋酸化及火山灰添加对浮游异养细菌的影响,初步揭示了浮游细菌对大气CO_2升高及火山爆发事件的反馈,完善了地质突变期海洋生态系统反馈的认识。另外,在深部生物圈MCG古菌的研究上取得了重要进展。MCG是迄今为止发现分布最为广泛的一类未培养古菌,被认为是海底深部生物圈中最丰富,并且最活跃的类群之一,很可能在全球物质和能量循环过程中发挥了重要的作用。课题组发现MCG古菌在系统发育上处于一个深的分支,代表了一类自然界较古老的古菌,显著不同于目前分类已确定的所有古菌门类,并提议将MCG古菌归类于一个全新的门类,命名为深古菌门(Bathyarchaeota)。这是目前首个由中国学者提议的古菌门的分类,是古菌和生命起源和演化研究的重要进展之一,也将为该领域的科学研究起到积极推动作用。We conducted further investigations on the microbial distribution characteristics and its relation with environmental factors, mainly on Actic ice front area and South-west Indian deep ocean. Our results revealed the dynamic microbial community structures and the ecological functions of some microbial groups, thus provided precious biological materials to explore the geological functions of microorganisms in the Earth history. Meanwhile, the microbial structure in the Southwest Indian deep ocean was found to be related with some elements including Calcium、Phosphorus、and Sulfur, providing data and research basis for further scientific studies on revealing the biogeochemical roles of marine microorganisms. We conducted a series of environmental simulating experiments such as marine acidification and volcanic eruption which represent important geological events in the earth history. We focused on the responses of planktonic heterotrophic bacteria towards marine acidification and supplementing with volcanic ashes, our study supplements current understanding on the responses of marine ecosystem in the geological disrupting events. Moreover, we have made significant progresses on MCG archaea in the deep subsurface biosphere. MCG is one of the most widely distributed cosmopolitan uncultivated archaea, regarded as the most abundant and active archaeal group. MCG is probably playing important roles in the biogeochemical roles on Earth. We found that MCG is placed in a deep branch on the phylogenetic tree, representing an ancient group of archaea, and distinct from all known archaeal Phylum. Therefore, we propose to name MCG as a novel archaeal Phylum as "Bathyarchaeota". Proposing of MCG into a new archaeal phylum would stimulate research interests in this unknown fascinating archaeal group

    SPATIAL OPTIMIZATION STRATEGY FOR XIAOCHI IN HUBEI PROVINCE IN THE VIEW OF INTEGRATING NEIGHBORING CITIES OF JIUJIANG AND HUANGMEI

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    同城化是"从区域论城市"基础上形成的一种新的城市区域发展观。在湖北小池滨江新区上升为"省级战略"之际,从政策主导、内生驱动、外借助推、资源聚合等4个方面分析小池南望融入九江同城发展的动力。结合相关数据分析指出,在"中四角"地理中心与"鄂东门户"耦合的特殊区位条件下,小池发展面临区位优势转化难、产业定位游离、城镇化动力不足、空间风貌特色欠缺等问题,并从九江、黄梅"同城共建、拥江共享、错位共赢"3个维度指出,位于鄂东前沿阵地的小池城镇空间需要重点从构建完善的公共服务设施体系和基础设施网络、提升拥江发展的梯次空间品质、聚合错位发展的产业布局等方面调控优化,以彰显两地的同城化效应,带动鄂东门户地带的发展。Urban area integration is a new form of regional development based on the concept of "city-region." This paper analyzes the driving force for integrating Xiaochi into its neighboring Jiujiang City from the four aspects of the macroeconomic policy, the internal driving force, the external boosting power, and the endogenous resources aggregation, hoping to facilitate the development of Xiaochi Riverside District as it has risen as the "provincial strategy." Statistical analysis reveals that major challenges in Xiaochi, a town located in the center of the so-called "four corners in central China" as well as at "the gateway of eastern Hubei Province," consist of diffi culty in exploiting regional features, random industry positioning, feeble driving force for urbanization, and lack of spatial characteristics. This paper proposes a spatial optimization strategy to overcome the above challenges based upon the principles of "building as one city, co-sharing resources along the Yangtze River, and win-win via dislocation development" for the development of Jiujiang and Huangmei cities. In detail, Xiaochi, as a forefront located in eastern Hubei Province, should focus on boosting the public facility system and infrastructure network, enhancing the quality of its riverside echelon spaces, and optimizing dislocation development of the industrial layout. By doing so, the effect of urban area integration is expected to be highlighted to promote the development of the portal area in the eastern Hubei Province.国家自然科学基金项目(51478199);; 高等学校博士学科点专项科研基金项目(20120142120013

    The Applications of Localized Surface Plasmon in Optoelectronic Devices

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    随着微加工技术和纳米技术的迅速发展,表面等离子体技术在光电子器件的微型化和集成化上得到了广泛应用,受到了物理、化学、生物、以及医学等多个领域人士的极大关注。局域表面等离子体(lSPS)由于具有独特的传播、激发、以及表面电磁场的局域增强特性,使得其在各个领域的应用有着显著的优势。文章叙述了lSP的相关特性及影响其共振频率的几个因素。分析了lSP在光伏电池、光电探测器和发光二极管(lEd)等领域的应用,包括最近几年所取得的一些重要进步,并着重介绍了我们小组近期在这些方面研究所取得的成果。With the rapid development of micro- machining technology and nanotechnology,surface plasmon technology has been widely used in optoelectronic devices on miniaturization and integration,and has been concerned in many fields,such as physics,chemistry,biology,medicine,and so on.Localized surface plasmons( LSPs) has an significant advantage of application in various fields because of the unique properties of propagation,excitation and localized surface electromagnetic field enhancements.This paper we present a brief description of the relevant characteristics of the LSP and the factors that affect its resonant frequency.And then we introduce the applications LSP in photovoltaic cells,photodetectors,light- emitting diode( LED) and other areas,and highlight the achievements that our team achieved in these areas recently.国家自然科学基金青年基金项目(项目编号:61108064

    Phase Modulated Real Time Joint TransForm Correlator

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    提出一种位相调制的实时联合变换相关器。它采用液晶显示屏作为输入器件,用液晶光阀记录和显示联合功率谱。利用液晶显示屏上的光栅状结构的衍射级,提高光能的利用率,并充分利用液晶光阀的有效使用面积。采用成像透镜放大各衍射级的联合频谱,适应液晶光阀较低的分辨率要求。在相关器的光路中插入两块倾斜的平行平面玻璃板,以改变各衍射级的参考图像和目标图像之间的位相差。这种方法可产生比传统的实时联合变换相关器更好的输出相关性能。实验结果证实了该系统设计及性能分析的正确性A phase modulated real time joint transForm correlator is proposed, in which a liquid crystal display screen is adopted as an input device and the joint power spectrum is recorded and displayed by a liquid crystal light valve.The diFFraction orders of the grating type structure on the liquid crystal display screen are utilized in this system.As a result, it can use the light energy as well as the physical area of the liquid crystal light valve more eFFiciently.In order to suit low resolution of the liquid crystal light valve, an imaging lens is applied to ampliFying joint Frequency spectrum of the diFFraction orders.The two oblique parallel plane glass plates are inserted in the correlator to manipulate the phase diFFerences between the reFerence image and the target image of the diFFraction orders.This technique yields better output correlation perFormences than the classical real time joint transForm correlator.The experimental results veriFied the correctness of the system design and perFormance analysis.福建省自然科学基

    新国土空间规划体系下交通规划的适应性变革——以厦门为例

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    从\"多规合一\"到国土空间规划体系的提出,充分体现了国家规划管理体制和规划治理思路的转变。在此背景下,交通规划作为国土空间规划体系的一部分也面临迫切的深层次变革。本文梳理了我国空间规划体系提出的过程和含义,基于现有规划体系中交通规划所处的地位和作用以及与其他城乡规划的联系,分析了在新国土空间规划体系下,交通规划变革的必要性;进而提出了交通规划的变革要点:首先,交通规划的变革要认识新国土空间规划体系下交通规划面临的主要矛盾,明确交通规划的作用,厘清交通部门与城乡规划各部门之间的职能关系;其次,确定交通规划与空间规划体系的适应性发展,即交通规划既需要在管控层面与空间规划体系的规划思路、分级管控和划定的\"三区三线\"相协调,也需要在发展上充分体现新时代交通强国战略需求。最后,以厦门市为例,介绍了厦门对于建立空间规划一张蓝图的探索,分析了厦门交通系统规划与全域空间规划一张图的适应性,以期为新国土空间规划体系背景下的交通系统规划提供思路借鉴

    管棚保护下框架桥顶进工程高程控制分析

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    大直径管棚保护下直接顶进预制箱涵技术是近年来国内发展起来的一种全新的施工技术,但其难度大,理论发展不完善,可借鉴的经验少.依托南昌市新龙岗大道下穿向莆铁路工程,根据实际工程情况建立力学分析模型,计算框架桥下钢管的受力,并根据钢管的受力情况假定钢管为Winkler弹性地基梁,运用弹性地基梁理论建立钢管挠曲微分方程并求解该微分方程,从而计算出框架桥顶进过程中的钢管挠曲变形,进而确定顶进过程中框架桥高程偏差情况.理论分析表明,底排管棚的支撑和引导作用有助于框架桥推进,并能有效遏制框架桥\"栽头\"和\"抬头\"现象,对于现场工程施工具有很好的参考价值.福建省自然科学基金(2014J01208

    Research on coexistence between CS-DCSK UWB and narrow-band communication systems

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    分析了密集多径环境下码复用差分混沌移位键控(COdE-SHIfTEd dIffErEnTIAl CHAOS SHIfT kEyIng,CS-dCSk)超宽带(ulTrA WIdEbAnd,uWb)通信系统在单个和多个窄带干扰(nArrOW bAnd InTErfErEnCE,nbI)信号下的比特误码率(bITErrOr rATE,bEr)性能。建立CS-dCSk uWb系统仿真模型,并通过采样扩展方法推导出bEr的表达式,从而得到系统在不同干扰条件下的bEr性能。分析和仿真结果表明,nbI信号对系统有明显干扰作用,但系统性能在不同频率干扰下保持稳定。The performance of code-shifted differential chaos shift keying(CS-DCSK) ultra wideband(UWB) communication system under single or multiple narrow band interferers is analyzed in dense multipath environments.The bit error rate(BER) is derived on the basis of the sampling expansion approach under different interference strengths.The simulations and analyses demonstrate that the NBI signal interferes significantly the performance of system.However,the system performance keeps stable under interferer with different frequencies.国家自然科学基金(61001073;60972053); 欧盟FP7(294923)~
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