1,338 research outputs found

    The Application of Raman Spectroscopy and Imaging in Cellular Research

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    细胞是真核生物的最小生命单元,也是维持生物形态和功能的最小基本单位。细胞在生命过程中时时刻刻都进行着复杂的新陈代谢,细胞内所有信息的传递、物质交换、胞内分子的变化都和细胞的状态有着密切联系。它是生物个体在生命过程中疾病产生和发展的基础。自从人类发明了显微镜,对生命的研究对象开始由宏观的个体、器官、组织向细胞、亚细胞水平发展。现在,人们对细胞的整体组成以及细胞内亚结构已经基本确定。尽管许许多多的科学家对细胞的研究已经深入细胞内(细胞核、DNA、核内蛋白质、脂质),但是由于细胞这一体系的特殊性及复杂性,因而对细胞的许多研究问题都未能得到解决。所以当前亟须发展多种细胞检测和分析技术,以研究细胞中各类...Cell is the smallest unit of life, and also the smallest basic unit of maintaining biological morphology and functions of eukaryotic organisms. Cells experience complex metabolism in every moment of the life processes. All cellular information transmission, material exchange, and molecular changes are closely related with the state of cells. Cells are the foundation of disease occurrence and devel...学位:理学硕士院系专业:化学化工学院_分析化学学号:2052013115156

    On the Application of ABC (Activity-Based Costing) in the Cost Model of Mobile Communications Companies

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    近年来,中国电信企业呈现了前所未有的快速增长势头。但随着中国经济市场化的程度越来越高,几家电信企业间的竞争也越来越激烈,电信资费的不断下降、用户发展成本的不断提高,使得中国电信企业的盈利空间越来越小。在这种情况下,如何制订科学的价格策略,避免盲目竞争,以及如何寻找可压缩的成本空间,成为电信企业的当务之急。但目前中国电信企业面临的现状是:所提供的服务已远非传统的话音业务,增值业务和数据业务的比重不断提高,电信服务的多元化和多样化已成必然趋势,相伴随而产生的各种资费套餐层出不穷,用户品牌及用户群体划分也越来越细致,传统的粗放的成本管理方法已不能满足科学的价格策略形成机制的需求。本文从作业成本法的概...In recent years, communications industry in China has witnessed an unprecedented increase. However, with the further development of China’s market and economy, competitions among communications companies become more fierce. With the decrease of communications fee and the increase of cost of the development of customers, the profit margin becomes smaller and smaller. Under such circumstances, to fi...学位:工商管理硕士院系专业:管理学院高级经理教育中心(EMBA项目)_高级管理人员工商管理硕士(EMBA)学号:X200715607

    Carbon Sequestration and Balance in Kandelia candel Plantation Ecosystem in Jiulongjiang Estuary

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    本文选择福建九龙江口不同发育阶段(中龄林、成熟林)的秋茄红树林为研究对象,通过测定秋茄红树林林木层各器官、凋落物层和土壤层含碳率,结合各组分生物量和年净生产量,计算了秋茄红树林生态系统的碳储量和不同发育阶段秋茄林的年净固碳量。于2010年5月至2011年4月,采用LI–8100全自动土壤CO2通量测定系统,研究了不同林龄秋茄林的土壤呼吸的日动态、月动态与季节差异,及其土壤水热因子对土壤呼吸的影响。通过测定样地的土壤含碳率和碳储量,以及秋茄林生态系统地上部分的年固碳量,分析评价了秋茄红树林生态系统的碳源-碳汇能力,以期为准确评估我国东南沿海秋茄红树林生态系统的碳汇能力提供科学依据。主要研究结果如...The carbon storage and net carbon sequesation of different ages plantations was studied at a subtropical Kandelia candel mangrove wetland in Jiulongjiang Estuary. The carbon content of organs and soil in tree, litterfall and soil layers was measured, and then carbon storage and net carbon sequesation were calculated by carbon content and biomass or net productivity of plantations. The diurnal, mon...学位:理学博士院系专业:海洋与环境学院环境科学与工程系_环境科学学号:2262009015327

    固定係数でない多部門モデルにおける労働価値説

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    In a narrow sense, the labor theory of value is the theory that relativeprices(exchange ratios)are determined by the ratio of the amount oflabor invested in each commodity. To give an example of Adam Smithʼsexplanation, the amount of labor to catch a beaver is twice the amount oflabor to catch a deer, then the exchange ratio would be1beaver=2deer.Adam Smith believed that this would only be possible in the earlyuncivilized state. In contrast, as time went by, with Ricardo and Marx, thescope of the labor theory of value became wider, including economies inwhich capital existed. However, it cannot be said that almost all goods areproduced directly by labor alone in the present age, because an extremelywide variety of goods are input into the economy. Under these productionconditions, it is by no means obvious that the exchange ratio is determinedby the ratio of the amount of labor invested.In defense of the labor value theory, “in a real economy, fixed coefficientsare more realistic.”Neoclassical production functions, such as the CobbDouglas model, are unrealistic. This is one of the most powerfulcounterarguments. However, there is another possible counterargument.“Even if we adopt the neoclassical production function, the labor valuetheory still holds. This is a more powerful counterargument. This isbecause it argues that the labor value theory is valid even if we adopt theposition of modern economics.The case of two sectors is treated in Onishi[2019][2020]. However, it isnot easy to determine whether it is valid in three or more sectors. In thispaper, we show that the amount of invested labor is proportional to theamount of output under a multisector model with a Cobb-Douglas type production function. In doing so, we consider a flow economy in which thecapital stock does not exist. This is because the existence of a capital stockimplies that a portion of the labor input in the current period remains as astock and is not fully embodied in output.In this paper, by showing that the amount of labor invested in each goodis proportional to the amount of production, the labor value theory isinterpreted to mean that the exchange ratio of each good is determined bythe amount of labor invested in the good

    最適制御問題の経済学的解釈(2)

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    In my previous articles[5], I introduced the general formulation in section4.9 of Kato[2] and interpreted it from the economic viewpoint. However,this formulation does not contain time preference. In most of optimalgrowth models, instantaneous utility function has time preference.Hence,this article shall generalize the general formulation in section 4.9of Kato[2] to include time preference and be interpreted from theperspective of economics

    On the Conjugacy Class Size of Finite Groups and Group Structure

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    利用元素的性质来探讨有限群的结构是很活跃的课题. 本文主要研究元素共轭类长的算术性质对有限群结构的影响, 特别是素数幂阶元的共轭类长无平方因子对有限群结构的影响.Using the property of the elements to study the structure of finite groups is a very active topic.This thesis mainly incvestigate how certain artithmetical conditions on conjugacy class size of finite groups influence the group structure, especially when the conjugacy class size of the prime power elements is squarefree.学位:理学硕士院系专业:数学科学学院数学与应用数学系_基础数学学号:1902007115208

    Empirical study of FDI and Regional Economic Growth in China

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    改革开放以来,FDI保持了高速增长,截止2003年底中国累计利用FDI高达5104亿美元。在引资工作取得较大成就的同时,我们也看到了我国区域间FDI分布的不平衡,它在一定程度上造成了区域间经济发展水平的不断拉大。 在第一部分,我们首先对近年来我国的引资特点及原因作一个简要地回顾;然后利用FDI流入业绩指数与FDI流入潜力指数综合评估了我国各个省、直辖市及自治区近十年来(1992-2001)来的引资情况。我们认为,东部地区无论是在引资表现还是在引资潜力方面,都占有绝对优势地位。在此基础上,我们提出,导致我国区域间经济发展水平不断拉大的最主要原因可能是FDI的流入差异。 在第二部分,我们探讨了...China keeps high speed in the growth of FDI inflow since the Reform and Opening-up. Up to 2003, China had achieved accumulative total FDI inflow valued 510.4 billion US dollars. Meanwhile, we find out that there exists imbalances of FDI distribution among the regions in China, which result in the fact that the gap of development level in the regional economies is kept enlarging to some extent. In...学位:经济学硕士院系专业:经济学院经济系_世界经济学号:20010900
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