1,568 research outputs found
Preparation and Characterization of FeOx/Rh(111) and CoOx/Rh(111) Model Catalysts
多相催化剂的表面是催化反应的活性位点,表面组成、粒径和结构决定了催化剂的催化性能。真实催化剂结构复杂并且表面不均一,阻碍了表面灵敏的表征手段的运用,无法精准确定其构效关系。构建成分简单结构单一的模型催化剂表面可简化传统催化剂的复杂性,用以研究气体吸脱附、催化活性和选择性、构效关系等催化问题。本论文在超高真空环境中制备模型表面FeOx/Rh(111)和CoOx/Rh(111),应用表面科学仪器X-射线光电子能谱(XPS)和低能离子散射谱(LEIS)对模型表面进行表征,取得了如下结果: 一、在高温(1023K),低氧压(1x10-7TorrO2)条件下,制备了一个单层FeO膜,继续蒸着则生长三维...The chemical reactions occur at the surface of the catalysts, whose size, structure and composition determine the catalytic properties. However, the real catalysts are usually complex and electrically insulating, inhibiting the application of, for example, EELS, STM and AFM. Information on the surface state of a catalyst cannot be obtained. Thus, one has to resort to models in order to do surface ...学位:理学硕士院系专业:化学化工学院_物理化学学号:2052011115163
Design and Implementation of Network Video Conference System Based on FMS
随着计算机技术、网络通信和多媒体技术的不断发展,视频会议系统在各领域都得到了广泛的关注。视频会议系统作为一种方便、快捷的新型通信工具,能够突破地域的限制,为用户传递和展示更多的信息,具有极其可观的发展前景和应用价值。 本文介绍了基于FlashMediaServer,结合主流的编程语言C++及其开发工具VisualStudio2010开发的一个桌面型的视频会议系统。该系统包括视音频、文字讨论、文件共享、会议控制与管理、系统控制与管理五大功能模块。系统中FMS使用实时通讯协议(RTMP),使用FMS可以捕获用户客户端的视频和音频流,通过FMS使用RTMP协议被传递到客户端(用户计算机上的Flas...With the development of computer technology, network communication and multimedia technology, video conferencing systems have been widely used in all areas of concern. The video conferencing system as a kind of new quick and convenient communication tools to break through the limits of the region, delivery and display more information for the user. So it will have more considerable development pro...学位:工程硕士院系专业:软件学院_软件工程学号:X201223113
Effects of marine pollution on the expression of hepatic HSP60 and HSP70 protein in Sebastiscus marmoratus
摘要 热应激蛋白(HeatShockProteins,HSPs)是一种生物体内普遍适用并高度存在的应激蛋白,在外界污染影响下,HSPs的表达量发生变化,能快速保护细胞对抗外源性或内源性应激的攻击,提高细胞的修复能力并增强细胞对付应激的耐受程度。HSPs的诱导被认为是反映环境污染状况最灵敏的生物学反应之一,本文着重研究海洋鱼类HSP60和HSP70蛋白对常见海洋污染物的响应规律,探讨作为生物标志物的可行性。 本研究利用蛋白印迹法测定不同浓度石油水溶性成分(watersolublefraction,WSF)(20μg•L-1、40μg•L-1、80μg•L-...Abstract Heat Shock Proteins (HSPs) is a universal stress proteins in vivo. Under the environmental pollution, changes in the expression of HSPs can quickly protect the cells against exogenous or endogenous stress through increasing the repair capacity of cells and enhancing the tolerance of cell to stresses. Induction of HSPs is considered to be one of the most sensitive biological responses to ...学位:理学硕士院系专业:环境与生态学院_环境科学学号:3312012115165
GABAergic Mechanisms for Construction of Selectivity for Object Features and of Receptive Fields of Monkey Inferior Temporal Neurons
Development and characterization of nano functionally graded materials (ナノ傾斜機能材料の開発と特性評価)
信州大学(Shinshu university)博士(工学)この博士論文は、次の学術雑誌論文を一部に使用しています。POLYMER COMPOSITES. 34(10):1774-1781 (2013); doi:10.1002/pc.22581. © 2013 Society of Plastics Engineers.NANO. 9(1):1450011 (2014); doi:10.1142/S1793292014500118.POLYMER COMPOSITES. 35(3):557-563 (2014); doi:10.1002/pc.22695. © 2013 Society of Plastics Engineers.Thesis王 毅. Development and characterization of nano functionally graded materials (ナノ傾斜機能材料の開発と特性評価). 信州大学, 2014, 博士論文. 博士(工学), 乙第227号, 平成26年3月20日授与.doctoral thesi
Performance analysis and optimization of refrigeration cyclebased on three classes of new working substances
随着科学的发展和技术的进步,制冷技术已越来越凸显其重要地位和人们对其的依赖。传统的气体压缩膨胀制冷技术是当今制冷空调领域的主流,然而气体制冷因其存在一定程度的温室效应、噪音较大以及制冷效率提高的空间有限等不利因素,促使不少学者和工程技术人员正在探寻一些潜在的绿色节能制冷新技术。磁制冷、电热制冷、半导体热电制冷等新型工质制冷技术节能环保优势明显,采用的循环工质均为固体材料,已获得越来越多学者和工程师的关注和重视。本博士论文研究以磁热材料、电热材料和半导体热电材料为工质的新型磁制冷、电热制冷和半导体热电制冷循环的性能,主要研究内容如下: 第二和第三章研究以磁热材料为工质的Ericsson制冷循环...With the development of science and technology, refrigeration technology has become more and more important one. The traditional gas compression refrigeration technology is of the mainstream in the present field of refrigeration and air-condition, but it has some disadvantages such as greenhouse effect, noise, and limited cooling efficiency. For this reason, a number of scholars and engineers are ...学位:理学博士院系专业:物理科学与技术学院_凝聚态物理学号:1982013015423
Kinetics Study of Pyrolysis of CH4 to grow CNTs over a Ni-Mg-O Catalyst
Extended Abstract In 1991, Iijima of the NEC Laboratory in Japan reported the first observation of multi-walled carbon nanotubes (MWNT) in the products of C60 and other fullerenes made by arc-discharge. Due to the unique optical, electical and magnetic properties of those novel nano-carbon materials, and their applications of carbon nanotubes in many scientific fields, such as gas storage , pol...学位:理学硕士院系专业:化学化工学院化学系_物理化学(含化学物理)学号:20012503
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