199 research outputs found

    Study on the release of CO, Bap, NNK and phenol in cigarette smoke by thermogravimetry and pyrolysis combustion platform

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    随着世界反吸烟运动呼声的高涨以及人们对健康问题的日益关注,烟草消费者对卷烟质量及安全性提出了更高的要求。进行烟气中有害成分的研究对提高卷烟制品的质量和商业价值具有重要意义。烟草科技工作者应该在创造烟草低危害品牌和构建烟草减害技术体系的基础上,逐步确立主流烟气中有害成分释放量和减害核心技术方面的优势,为建立适应中式卷烟发展及新型加热非燃烧型烟草制品的开发提供理论基础和技术支撑。 本文利用热重联合快速热解燃烧实验平台,对卷烟烟气中有害成分CO、苯并芘(Bap)、4-(N-甲基-N-亚硝胺)-1-(3-吡啶基)-丁酮(NNK)和苯酚的释放进行了研究。利用热重实验将烟草划分为四个主要的组分,即易挥发...With the rising voice of anti-smoking campaigns in the world and the growing concern about health problems, tobacco consumers have put higher demands on cigarette safety. Study of harmful components in flue gas has very important significance to improve the quality of cigarette products and commercial value. Tobacco science and technology workers should be in the construction of tobacco harm reduc...学位:工学硕士院系专业:化学化工学院_工程硕士(化学工程)学号:2062014115142

    Study on Value Analysis and Valuation of Listed Banks in China

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    在市场经济体制和资本市场逐步完善的过程中,价值评估理论和方法成为人们日益关注的热点问题。随着我国上市银行的价值评估理念在银行管理和投资分析中的推广和应用,选用恰当的价值评估方法的重要性不言而喻。本文通过介绍和总结目前的价值评估理论及方法,再结合我国上市银行的自身特点,重点研究股权自由现金流折现模型和经济增加值模型,结合基本面分析对国内上市银行进行估值,以期选择出适合于我国上市银行的估值方法及模型。 本文主要分为五个部分。本文首先讨论了本文选题的背景及意义,梳理了国内外相关的理论研究,并介绍了本文研究方法与角度。其次,论文论述了企业价值评估理论与模型,从企业价值的含义入手,探讨分析了影响企业价...In the process of consummating the market economy system and the capital market, the theories and the methods of the valuation become the hot topic which the people pay more attention day by day .With the valuation of listed banks in China concept promotion and application in the management and analysis of investment, choosing the suitable valuation method is very important. This thesis introduces...学位:经济学硕士院系专业:经济学院财政系_资产评估学号:1552006115095

    An Contrast Research of Production Evaluation In the Case of Thai Consumer and Chinese/Japanese/Korean Products

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    本研究以处在泰国文化背景下的泰国消费者作为研究对象,选取中国产品、日本产品和韩国产品进行深入比较和探讨,采用定量和定性相结合的研究方法,以问卷调查、焦点小组座谈和深度访谈的形式了解泰国消费者对中、日、韩三国的产品评价,以洞察隐藏在产品评价背后的原因和所代表的文化意义,并借鉴日韩产品发展的成功经验,给出针对泰国消费者的具有实践意义的中国产品在泰国的发展策略。 研究发现,泰国消费者对于中国产品持总体默认的态度,被中国产品层层包围下的泰国消费者被动地选择中国产品,并因低价而欣然接受。另外,对质量过于低下以及假冒伪劣产品感到无奈并因此情绪影响到对中国品牌的评价和购买;对于韩国产品来说,泰国消费者对于...The research selects products in Thailand which brands are original from China, South Korea and Japan and contrast those product evaluations, such as perceived quality, perceive value and purchase intention. The research methods include questionnaire survey, focus group and depth interview are implemented to have insight into the factors and cultural significance behind such differences. Taken suc...学位:文学硕士院系专业:新闻传播学院_传播学学号:3192010115286

    Object Detection and Tracking Based on Visual Saliency

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    基于视频的目标检测与跟踪是计算机视觉领域热点的研究方向之一,它在智能视频监控、军事侦察监视、交通管理和无人驾驶等领域有着广泛的应用,并发挥着举足轻重的作用。 在机器视觉中,一般的视频跟踪技术需要在第一帧手动地标记出运动目标。本文针对这一问题,研究如何让机器自动发现显著物并进行跟踪:利用视觉显著性对目标进行检测,通过词袋模型形成对运动目标的观测,结合粒子滤波跟踪算法对运动目标进行跟踪。主要的研究工作及创新点如下: 1.提出一种基于多线索视觉显著性融合的运动目标检测算法。利用中央周边差异显著性来检测局部对比度强的显著区域,利用谱残差显著性检测图像在空间域上的显著区域,利用动态显著性来检测具有运...Video-based target detection and tracking is one of the research hotspots in the field of computer vision. It plays a very important role in many applications, such as smart surveillance, military reconnaissance and surveillance, traffic management and auto driving. In machine vision, tracking always needs to label the object by human on the first frame. According to this problem, this thesis res...学位:工学硕士院系专业:信息科学与技术学院计算机科学系_计算机应用技术学号:2302007115126

    Comparative Proteomic Analysis on Differential Responses of Growth, Development and Tolerance of Woody Plants to Simulated Acid Rain under Various Calcium Levels

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    钙(calcium,Ca)参与植物生理和发育的许多生物学过程,除了在营养和结构发面发挥重要功能外,胞内自由Ca离子还在细胞内起第二信使的作用。酸雨作为全球范围内严重的环境污染问题之一,对森林生态系统的危害也日益严重,其危害机制之一就是可以大量淋溶植物体和土壤中的Ca,从而影响森林植被的生长和发育过程。研究酸雨影响木本植物生长机制以及如何提高植物对酸雨的耐受能力,对森林生态系统的保护和农业生产都具有重要意义。酸雨对植物生长和生理生化等方面的影响已有一些研究报道,但关于酸雨引起生态系统的Ca流失和森林衰退的关系及其作用机理仍不清楚,尤其是在蛋白质及基因水平上的研究还鲜见报道。为了探究Ca和酸雨对森...Calcium (Ca) involves in many physiology and developmental processes in plants, which plays an important role in both nutrition and structure of plants and cellular signaling. Acid rain (AR) has become one of the serious environmental issues in China. AR severely affects forest vegetation growth and development through leaching away Ca element from plant and soil. Hence, it is of great practical s...学位:理学博士院系专业:生命科学学院_植物学学号:2162011015393

    Study on Investment Opportunities in Preschool Quality Education Textbook for Family-use

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    幼儿教育,广义上是指婴幼儿从出生到小学入学这个阶段(0-6岁)的教育,近年来幼儿教育发展迅速,被誉为“永远的朝阳行业”,在我国,幼儿教育未纳入义务教育范围,财政对幼儿教育的拨款比例极低,民间投资活跃,但竞争多集中在主体产业,如早教园、幼儿园等,对辅助产业投入不足,造成幼教产业链发展不平衡,整体质量水平不高的局面。 本文旨在探讨幼教产业的发展潜力,在幼教领域寻找投资的蓝海。本文调查了20种幼儿教材,对其内容及形式进行分析,发现普遍存在这样的问题:观念落后、抄袭严重、西化教育、缺失传统教育等,进而发现了幼儿素质教育教材领域的投资机会,并根据现实情况,划分家庭用书及幼儿园用书两个市场,分析两者的优...Preschool education generally refers to the education for infants during the period from birth to preschool (0-6 years old). From a global perspective, the preschool education develops rapidly, known as “forever fastest-growing industry”. In China, the preschool education has not been included into the scope of compulsory education, the proportion of financial allocation for preschool education re...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)_投资学学号:1792007115047

    The Comparison Study on Degree System Reform in German and France under Bologna Process

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    博洛尼亚进程是一项旨在建设统一的欧洲高等教育区的高等教育改革计划。在这项改革计划中,学位制度改革占有非常重要的地位。研究博洛尼亚进程下的德法学位制度改革,不仅可以丰富我们对博洛尼亚进程的认识,而且可以为完善我国的学位制度提供有益的参考和借鉴。 本文的主要内容包括以下几个部分:首先,分析博洛尼亚进程的改革动因和发展历程;其次,从历史的角度,比较分析博洛尼亚改革之前,德法两国的学位制度;再次,从现状出发,比较分析德法两国在博洛尼亚进程改革中所采取的措施、取得的成效以及存在的问题;最后,对德法两国的学位制度改革进行总结分析,并提出完善我国学位制度的参考意见。 本研究的主要观点和结论:第一,在博洛...The purpose of Bologna Process is to build a harmonious European Higher Education Area. Degree system reform is a very important part in Bologna Process. Researching Bologna process is significant, and it can not only enrich our knowledge of Bologna Process, but also give us some suggestions on reforming our own degree system. Apart from the preface and conclusion, the main body of this paper cons...学位:教育学硕士院系专业:教育研究院_高等教育学学号:2572007115135

    An experimental study about the effection of antilogous platelet-rich plasma on the revascularization of rabbit prefabricated flap

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    研究目的: 本研究通过提取动物自身全血,制备成富血小板血浆(Platelet-richPlasma,PRP)。在兔腹部两侧各构建一个股动静脉血管束预构腹部皮瓣,将制备好的PRP应用于其中任意一侧的皮瓣,另一侧应用等量生理盐水,探讨局部应用PRP对预构皮瓣存活的影响,深入了解自身来源的富血小板血浆(PRP)在皮瓣转移过程中的作用,进一步探讨PRP影响预构皮瓣生长的作用原理,为PRP的临床应用提供理论依据。 研究方法: 在20只健康雄性新西兰大白兔腹部两侧构建股动静脉血管束预构皮瓣共40侧,随机分成实验侧和对照侧各20侧。实验侧向预构股血管束周围注射实验前1天预先制备好的自体PRP,对照...Objective: In this study, we extract platlet-rich plasma (platlet-rich plasma,PRP) from animal itself. Construct femoral arteriovenous bundle prefabricated flap on both side of these rabbits’ abdomens. We randomly divided the rabbits into experimental side and blank control side. Explore the influence of prefabricated flap survive by locally using PRP. Deeply understand the role of platelet-rich ...学位:医学硕士院系专业:医学院_外科学学号:2452011115333
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