280 research outputs found

    NMR-based metabonomics study on the metabolic respones of grouper (Epinephelus coioides) intestine to different level of dietary taurine and lipid

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    随着世界范围内水产养殖量的增加,鱼粉作为饲料中主要的蛋白质源,价格急剧上涨,供不应求。因此,用植物蛋白质原料(几乎不含牛磺酸)替代鱼粉来配制饲料成为水产养殖的趋势。在植物蛋白饲料中适当地添加牛磺酸、脂肪不仅能够促进鱼类的生长和品质的提高,而且还能降低饲料成本。然而,饲料中添加牛磺酸、脂肪等营养对鱼类代谢的影响及作用机制尚不完全清楚。 石斑鱼是一种低脂肪、高蛋白的上等食用鱼,富含蛋白质、维生素A、维生素D、钙、磷、钾等营养成分,其肉质细嫩洁白,类似鸡肉,素有“海鸡肉”之称,是一种名贵的海产鱼类。石斑鱼营养丰富、经济价值高,已经成为我国海南、广东、福建、广西及浙江沿海水产养殖的重要经济品种,随着...With the growing scale of aquaculture around the world, the price of fish meal which is the main source of protein in feeds has been rising sharply and is now in short supply. Therefore, using plant protein raw materials (almost no taurine) to make the feeds instead of fish meal has been a trend in aquaculture. The proper addition of taurine and fat in plant protein feeds can not only promote the ...学位:工学硕士院系专业:物理科学与技术学院_工程硕士(电子与通信工程)学号:3332014115284

    Analysis of the conflicts between public figures and the public's right to privacy

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    在当今这个高度发达的信息时代,公众人物隐私权和公众知情权之间的冲突与整合是不可阻挡的趋势。公众人物因其特殊的社会地位,对社会产生重要的影响,需要将其隐私权部分让渡。但是对于公众人物隐私权的限制,不能成为任意侵犯公众人物隐私权的借口。本文拟对公众人物、公众人物隐私权及公众知情权的基本概念、内容及公众隐私权与公众知情权的冲突进行分析,提出协调冲突遵循的原则,并对国内外关于公众人物隐私权的法律规定进行探讨,从而对构建我国公众人物隐私权提出设想,希望对我国公众人物隐私权制度的完善有所帮助。 论文采取在对基本概念阐述的基础上,逐步深入的方式,得出自己的结论。除了引言与结论以外,共分四个部分对公众人物隐...In today's highly developed information age, the conflicts and integration between public figures and the public's right to privacy is an irresistible trend. Due to their special social status, public figures, who have an important impact on society, need to be part of transferring their privacy. However, constraints of public figures to privacy can not be excuse that privacy of public figures can...学位:法学硕士院系专业:法学院法律系_民商法学(含劳动法学、社会保障法学)学号:K20100801

    Explore the role of MOAP-1 in Fas-induced hepatocytic apoptosis and chemical hepatocarcinogenesis

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    细胞凋亡是一种重要的生命过程。前期体外研究指出,MOAP-1在其中有着重要的作用。当多种凋亡刺激,如TNF-α,TRAIL,ETOP等,诱导时,它能促进Bax的构象变化,导致Bax由胞浆定位到线粒体上,引起线粒体外膜穿透(MOMP),释放细胞色素c,产生凋亡。但是,对于MOAP-1在体内模型中的功能,以及其在肝癌中的作用,则尚不清楚。本研究通过各种小鼠模型初步揭示了MOAP-1在体内条件下的功能以及在肝癌中的作用。 我们首次发现,MOAP-1敲除小鼠对于Fas介导的肝细胞凋亡具有明显的拮抗性。小鼠特异性Fas活性抗体Jo-2注射后的MOAP-1敲除小鼠的存活率远高于野生型小鼠。组织切片和相应...Apoptosis is a very important procedure in living animal. Previous researches indicate that MOAP-1 (Modulator of Apoptosis-1) participates and acts as an important role in it. When cells suffer several apoptotic stimuli, such as TNF-α,TRAIL,ETOP, etc, MOAP-1 can induce Bax conformation changing and then Bax will translocate and integrate into mitochondria out membrane, leading cytochrome c release...学位:理学硕士院系专业:生命科学学院生物医学科学系_细胞生物学学号:2172009115220

    Logistics Systems Modeling and Simulation:The Implementation of A Simulation System for Supply Distribution in SWARM

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    物流在经济全球化和电子商务日益普及的今天起着越来越重要的作用。论文应用系统理论分析物流系统的复杂性特征,归纳物流系统研究的主要问题,尤其是复杂物流系统研究的主要内容。分析了传统建模方法和计算机仿真方法在物流系统研究中的应用及其方法上的特点。根据计算机仿真技术的特点,讨论了计算机仿真方法在物流研究中的主要应用领域及应用前景。分析了离散事件系统仿真的方法和策略,总结了基于Petri网的建模方法、面向对象的建模技术和基于Agent的建模技术在系统建模和仿真中的应用,综述了各个方法处理问题的优缺点,进而分析了基于Agent建模技术在处理复杂物流系统时的建模思想及应用前景。论文以物流系统中的供应配送系统...Logistics is taking a more and more important part under the economic globalization and the popularization of electronic business. Based on the theory of system, the author analyzed the complexity of logistics systems. Also, the author concluded the mostly issue that logistics systems had researched, especially the central contents in complex logistics systems. The author analyzed the application ...学位:工学硕士院系专业:管理学院管理科学系_系统工程学号:20023700

    Study of the Agent-based Mechanism of Innovation Diffusion

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    采用基于AgEnT的建模思想和方法,结合创新扩散的微观机理和复杂网络的特征,研究基于AgEnT的创新扩散与bASS模型的内在联系,建立基于AgEnT的创新扩散模型,并通过计算实验,研究网络拓扑结构、内部因素和外部因素影响下的微观创新扩散机理。研究结果表明,当外部因素对创新扩散的影响力远小于内部因素时,无标度网络度分布的异质性最有利于创新的扩散。随着外部因素影响力的增大,创新扩散曲线在无标度网络和小世界网络中的差异逐渐减小。此外,内外部因素影响力的增大都有利于创新的有效扩散。This paper,by using the theory of agent-based modeling,applies the micro mechanism of innovation diffusion and complex networks to analyze the internal relationship between the agent-based innovation diffusion and Bass model.Then,the agent-based model of innovation diffusion is set up.With the method of computational experiments,it researches how the network topology,the internal and external factors influencing the process of innovation diffusion.The result shows that the heterogeneous degrees distribution of the scale-free network is benefit for the diffusion when the influence from the external factor is far less than from the internal factor.With the increasing influence from the external factor,the diversity of diffusion curves between the scale-free network and small-world network decrease gradually.In addition,the enlargement of the influence from the internal and external factors is in favor of innovation diffusion.国家自然科学基金项目(11005041); 福建省自然科学基金项目(2011J01383

    Computational Experiments for Study of the Competition Diffusion of New Products with Local Network Effects Based on Complex Social Networks

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    采用基于复杂社会网络视角的新产品竞争微观扩散模型,应用计算实验的方法分析局部网络效应下用户基础、产品内在价值以及初始种子用户的选择等因素对产品竞争扩散的影响。研究结果表明,与全局网络效应不同的是,在局部网络效应中,影响新产品竞争扩散的关键因素不是用户基础而是社会网络中消费者的交互作用,该作用加快了信息传播、产品扩散的速度;产品自身内在价值的加大可以弥补局部网络效应强度较弱的产品竞争弱势。此外,选择Hub节点作为初始种子用户将有利于产品的扩散并最终占有更有优势的竞争格局。This paper,by the micro diffusion model of new competition products,applies the method of computational experiments to analyze how the factors,such as user basis,the intrinsic value of the products and the selection of the initial seed users,influence the diffusion of competition products in the complex social networks.Result shows that the user bases will affect the competition diffusion of new products with local network effects,but the interaction between the customers from the social network is a more critical factor to reach a successful diffusion,which is different from the global network effects.Their interaction accelerates the speed of information spreading and product diffusion.The increasing of the products' intrinsic value can compensate for the competition weakness of the products whose strength of the local network effects is weaker.Furthermore,choosing the hub node as the initial seed user is helpful for the product to diffuse and occupy a more well competition situation.国家自然科学基金项目(11005041); 福建省自然科学基金项目(2011J01383

    双金属Zn-Fe金属有机框架的制备及其丙酮气敏特性研究

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    采用溶剂热法制备了双金属Zn-Fe金属有机框架结构(Zn-Fe MOF),利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射仪(XRD)对其微观形貌和晶相进行表征分析。结果表明:制备的双金属Zn-Fe MOF为纳米球结构,其直径约为150 nm。同时,制备了基于双金属Zn-Fe MOF材料的气体传感器件,研究了其对丙酮的气敏特性。测试结果表明:基于双金属Zn-Fe MOF的气体传感器对丙酮的最佳工作温度为210℃。在最佳工作温度下,对浓度为1×10-6的丙酮气体响应可达到2,响应/恢复时间分别为6 s/13 s,且具有较好的重复性和长期稳定性。最后,对基于双金属Zn-Fe MOF气体传感器的气敏机理进行了讨论。国家自然科学基金项目(51205274);;山西省人才专项项目(2016[36]);;山西省自然基金项目(2016[39]);;山西省高校科技创新研究项目(2016[37]);;山西省归国留学择优项目([2014]95);;山西省归国留学基金项目(2013-035);;山西省科技重大专项项目(20121101004);;山西省高等学校特色重点学科建设项目(晋教财[2012]45号

    单晶6H-SiC经氦离子辐照及退火后的微观组织研究

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    在400℃下对单晶6H-SiC进行了400keV氦离子辐照,辐照剂量为1×1016He+/cm2,随后在1200和1500℃退火30min。采用透射电子显微镜和扫描电子显微镜对辐照态和退火态SiC进行微观结构观察与分析。结果表明,单晶6H-SiC在400℃经氦离子辐照后,仅观察到由辐照引起的位移损伤带,而未观察到明显尺寸的氦气泡。但经1200℃退火30min后,在辐照损伤区域形成了呈血小板状的气泡簇,其主要分布在(0001)晶面上,少量形成在(1120)晶面。辐照未在6H-SiC表面上形成明显尺寸的缺陷,而经1200℃退火30min后,SiC表面出现大尺寸的起泡和凹坑,进一步提高退火温度至1500℃时,表面起泡和形成凹坑更严重,并产生了大量裂纹。本研究同时对微观结构演化的机理进行了分析与讨论。中国工程物理研究院NPL,CAEP项目资助(2015AB001

    水资源资产负债表核算体系研究——基于自然资源资产离任审计视角

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    十三五规划中明确提出编制"水资源资产负债表"的要求。文章依据"环境—经济"水资源循环模型,将水资源资产与权益归属相结合,剖析资产存量变化背后的经济活动过程;重新定义水资源负债的内涵及核算内容,将水资源过度耗减与水质降级纳入水资源负债核算范畴;基于与财务会计核算的相通之处,提出水资源资产负债表的核算流程。最后,进一步探讨在会计实务中编制水资源资产负债表的困难和发展方向,为我国开展自然资源资产离任审计提供会计信息支持。国家社会科学基金面上项目“分权视阈下我国土壤重金属污染修复基金制度设计与运行机制研究”(18BJY085
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