424 research outputs found

    Cloning, Expression and Immunolocalization of Aspartyl Protease Inhibitor Gene of Angiostrongylus cantonensis

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    广州管圆线虫(Angiostrongyluscantonensis)是一种人畜共患自然疫源性寄生虫,能引起人的嗜酸性粒细胞增多性脑膜炎,也被称为广州管圆线虫病。其中间宿主是软体动物,例如福寿螺、玛瑙螺等,并以啮齿类动物等作为其终宿主。人类是广州管圆线虫的偶然宿主,因误食寄生有广州管圆线虫的第三期幼虫(L3)的福寿螺等而引起广州管圆线虫病。 寄生虫的天冬氨酸蛋白酶抑制剂(aspartylproteaseinhibitor,API)在寄生虫的寄生生活中起着重要的作用,包括寄生虫的营养摄取,组织入侵,免疫逃避,生长发育等等。本论文以广州管圆线虫为研究对象,以API基因作为研究的目的基因,对目的基因...Angiostrongylus cantonensis is a serious zoonoses parasite that causing parasitic, can cause eosinophilicmeningitis, also known as Angiostrongyliasis. its intermediate host is mollusca, such as apple snails, achatina fulica and so on. And parasitic on Glires as its final host. Human is the occasional host of this nematode, can catch theAngiostrongyliasis cantonensis by eating its infectivethird st...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:2162012115230

    Impacts of Product Line Design on Manufacturer's Preference about Channel Structures

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    随着市场竞争的日趋激烈,很多制造商都面临着重新选择与整合渠道的难题:是否在原有渠道结构的基础上增加新的分销渠道,或是削减原有的零售渠道?特别是伴随着互联网技术的高速发展引领消费者“网购”的普遍流行,也促使商家通过网络平台来销售他们的产品。以往的研究关注在既定的分销模式下,分析消费者的选择行为或制造商的策略偏好,很少有人考虑制造商是否应该拓展渠道结构的决策问题。尤其是考虑不同产品线设计时,制造商在高质量产品线和低质量产品线下的渠道偏好是否存在异同?因此本文将重点研究“产品线设计对制造商渠道结构的影响”。 本文突破了既定渠道模式的限制,首先从上游制造商的产品线设计出发,分析制造商应如何将相应的高...Currently with fierce competition increasing, many manufacturers face a question like channel reselection and integration of whether to add a new distribution channel in addition to their incumbent channel structure, or to reduce their incumbent retailing channel. Especially with the development of Internet technology which results in the popularity of online shopping among consumers, which promot...学位:管理学博士院系专业:管理学院_管理科学与工程学号:1772014015379

    Simulation Study of Biomass Gasification

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    生物质气化是生物质利用过程中热效率较高的一种方法,同时也是一种十分重要的可再生能源利用方式。本文采用AspenPlus模拟软件,结合吉布斯自由能最小原理,建立了生物质气化反应器模型,模拟研究了不同操作参数对气化结果的影响,同时对三种气化剂下的气化结果进行了对比分析。 在三种气化剂的模拟结果中,同一操作参数对气化结果的影响有一定共通性:(1)随着气化温度的升高(600~900℃),一氧化碳体积分数升高,二氧化碳和甲烷体积分数降低,但氢气体积分数变化不大;气体的热值升高(700℃以上),气体产率先升高后降低,气化效率略微升高。(2)随着S/B的增大(0.2~1.2),氢气和二氧化碳体积分数升高,...Biomass gasification is considered as one of the most promising technologies because it can convert renewable biomass resources into producer gas. In this study, based on Aspen Plus of process simulation software and the minimization principle of Gibbs free energy, a model for gasifier was developed. The effects of different reaction conditions on gasification performance were studied, and the res...学位:工学硕士院系专业:能源学院_能源化工学号:3242013115229

    Design and Implementation of Project Management System for an Aviation Enterprise

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    在航空企业型号项目研发过程中,由于对型号项目质量、可靠性、进度等方面要求严格,管理方式越来越强调按项目管理思想进行。型号项目管理是航空企业面向型号的基本管理方式,航空企业项目管理一般由企业级项目管理、型号级项目管理两个层次构成。 本文以航空企业型号研制为背景,以项目研制情况下项目管理实际需求为导向,运用软件工程理论和方法,进行项目管理系统需求分析、系统设计,并开发原型系统在某航空企业集团进行应用验证。论文以航空发动机等重点型号项目为基础,分析了航空企业型号研制项目特点,总结出航空企业型号项目研制条件下项目管理系统功能需求,并给出了项目管理系统用例图;在对航空企业型号项目研制组织模式、项目分解...Due to the complexity of aviation product development, and strict requirements of quality and schedule, the idea of project management becomes popular in the aviation research and development process. Aviation enterprise project management is formed by two levels in general, which are enterprise project management level and model project management level. Taking the model development in avia...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201023020

    Power Supervising System Based on GPRS network

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    笔者通过多年的道路、桥梁、隧道养护经验,针对当前国内道路照明、夜景照明及设备供配电、管养现状,在对当前的几种有线、无线数据传输技术进行分析、比较的基础上,选择在科技前沿的通用分组无线业务(GPRS)作为通讯的媒介,提出了基于GPRS网络的智能电力监控系统。通过GPRS网络的数据通信,该系统能实现与监控子站双向通信,既能从各监控子站接收各种电气参数数据、又能为用户提供一个可视化界面,使用户足不出户即可了解远方子站实时运行状况,并可根据实际需要向监控子站发送各种操作命令,控制监控子站的运行情况,且当设备出现异常或被盗时能自动发出报警信号;并着重介绍了利用电缆载波和电流监测等多种技术的电缆防盗报警系...The author through many year paths, the bridge, the tunnel maintenance experience, in view of the current domestic road lighting, the night scene illumination and the equipment for the power distribution, the tube raises the present situation, to the current several kinds wired, the wireless data transmission technology carries on the analysis, in the comparison foundation, chooses takes the commu...学位:工程硕士院系专业:信息科学与技术学院自动化系_控制理论与控制工程学号:X20043102

    A preliminary investigation about rivers’ robbers and controlling it in Ming and Qing Dynasty

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    晚明至清前期,河道是许多地区交通运输、商旅往来的基本通路。因商业贸易而南来北往的商人,因应试而赴省府的学子,因就任、回乡探亲而转徙的官员,以及承担漕粮运输的兵丁和探亲访友、求神祈福的众庶,往往择舟而行,形成了许多河道众语喧纷、热闹繁忙的景象。在这之外,我们还不应忽略的是,各类河湖盗贼亦混迹其中,他们或公开,或隐秘,或直接劫掠,或施计讹诈,演绎出“在家千日好,出门时时难”中的若干惊险故事。本文力图从社会史和制度史的角度,分析该时期内河盗贼形成的背景、类型,探讨受盗贼殃害的对象及其受殃实态,揭示当时政府、社会与众庶对河湖盗贼的防范机制及其产生的效果,本文分为五个部分: 第一部分,介绍选题的缘起,...In the late Ming and the early Qing Dynasty,rivers was the basic channel for transportation and business travel in many areas.Those people including merchants、scholars、officials and commen people often select to take the boats when they had to travel to others places due to various reasons ,thus,a busy scene often showed in rivers. Apart from this, We should not ignore a large number of robberies...学位:历史学博士院系专业:人文学院历史学系_专门史学号:1032007015373

    Researchon Optimization of Site Management of Plating Factory A

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    论文研究对象为国内一家卫浴企业内的电镀工厂。主要针对该工厂的运作管理问题及优化方法进行研究。研究的意义在于应用经典运作管理相关理论,探索适合于中国中小企业运作管理优化的一些方法。该电镀厂在整个企业工艺链中的运作管理水平最为落后,明显成为了该企业生产运作的薄弱环节。本论文通过对该电镀工厂的运作管理中订单、工具原料艺设备订单、工具原料艺设备订单、工具原料艺设备订单、工具原料艺设备订单、工具原料艺设备五个方面存在的问题进行分析,结合国际主流的运作管理理论提出对策和实践,进而分析改善达到的效果与不足。研究证明通过具体的订单、工具原料艺设备订单、工具原料艺设备订单、工具原料艺设备订单、工具原料艺设备订单...The research object of this paper is a plating factory of an excellent domestic sanitary and bath ware enterprise. The paper mainly makes a research on the factory’s problem in operational management and optimization. The significance of the research is toexplore some methods of optimization suitable for Chinese SMEs’operational management by applying classical theories of operational management. ...学位:经济学硕士院系专业:管理学院_工商管理硕士(MBA)学号:1792011115061

    Tian Wenjing Management of Henan Rural Fair in Yongzheng's Reign of Qing Dynasty

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    清前期河南市集的发展对以保甲制度为基础建立社会秩序的传统体制提出了挑战,各类文献留给人们河南盗案多发的印象。雍正年间河南巡抚田文镜认为,地方多盗是因为市集等空间聚集人口而杂乱喧嚣,容易潜藏匪类,因而发布了一系列政令,力图对市集发展加以控制,对商业活动加以干预,但是当商、店主乃至乡约地保并没有给予积极的配合,这些政令亦没有在实践中被贯彻,因而效果甚微。The development of Henan rural fair presented a challenge to the Bao Jia system that was based on the traditional system of social order in early Qing Dynasty.All materials give people the impression that robbery in Henan was very serious.To strengthen the management to the county fair,the pawnshop,the play field and so on,Tian Wenjing who was then appointed Henan governor thought that many robberies were caused by the accumulation population that led to the social disorder.Therefore,he issued a series of government's orders in order to control the rural fair and to intervene trade activity.But these orders had not been well implemented,therefore had little effect.教育部人文社会科学重点研究基地项目“明清以来河南基层社会转型研究”成果;项目批准号:06JJD77001

    明清商书文献中的运河航路秩序

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    明清时期商书编写进入鼎盛期,有关运河航运方面的商业活动指导著作数量众多,内容包括:对经商者行舟途中避盗情形的规诫,如对沿途的盗贼活动情况加以标识、慎雇船户、慎择泊船地点和时间、慎露财、慎选经商旅行的伙伴等;告诫经商者防范盗匪的侵扰,如阻塞河道、乘机哄抢;闷香迷客、老鸦讹商;假扮客商、乔装劫财;横截津路、杀人越货;兵为盗党,商客失怙,以及商客自救的办法等。因为商人在运河中的主要交通工具是船只,穿梭不息的船只就成为盗匪们觊觎的对象,加上官兵渎职、河水泛滥、灾异频发,商客遭遇到侵害的可能性就更大。商书文献一定程度上成为构建明清运河航路秩序重要的指导性书籍。国家社会科学基金项目“明清河海盗的生成及其治理研究”(12BZS084)阶段性成

    明清时期江河盗贼的基本来源探析

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    明中叶以后,依赖水运的长短途商业取得了巨大的发展空间,社会经济呈现出繁荣景象,江河盗贼伴随着商人经商、官员往来于途、试子应试乃至百姓日常流动而滋生,而官府长期延续的"重陆轻水"的社会管理模式使江河水域长期未得到应有的重视,已经设置的管理机构往往亦不能发挥应有的作用,以水为生活场域的渔船户、江河沿岸的居民、沿河地区的捕役和汛兵、漕户盐丁以及各类窝主均可能成为这一时期江河盗贼的基本来源,程度不同地对明清社会经济秩序构成威胁
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