9 research outputs found

    Irreversible Adsorption of Sn on Electrodes of Pt Single Crystal Basal Planes and The Electrocatalytic Properties for Ethanol and Ethylene Glycol Oxidation

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    为了研究电极的表面结构与催化性能的内在联系规律,在分子水平及表面原子排列结构层次发展有机小分子的电催化基础,本论文以表面原子排列结构明确的Pt单晶作为工作电极,运用电化学循环伏安(CV)、程序电位阶跃暂态技术等方法,深入研究了Pt单晶的三个基础晶面Pt(100)、Pt(110)和Pt(111)上Sn的不可逆吸附行为,及其对乙醇和乙二醇这两种C2分子的电催化氧化研究。取得的主要结果如下: ⑴发现Sn的不可逆吸附过程对铂单晶表面结构非常敏感,不同表面原子排列结构给出明显不同的吸脱附CV特征。在本论文中研究条件下,Sn的不可逆吸附可在Pt(111)和Pt(100)表面进行,但在Pt(110)表面不...In order to explore the surface modification of Pt single crystal electrodes by irreversible adsorption(IRA)of Sn and the electrocatalytic effects of modified electrodes for ethanol and ethylene glycol oxidation, three basal planes (100),(110) and (111) of Pt single crystal were prepared and used in the study of this thesis. Cyclic voltammetry, programmed potential step technique were employed in ...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:20042509

    Pt单晶(210)、(310)和(510)阶梯晶面上CO_2电催化还原的表面过程

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    研究Pt单晶(210)、(310)和(510)三个阶梯晶面上CO_2电催化还原的表面过程.通过改变处理条件获得单晶电极不同的表面结构.研究结果指出,当铂单晶电极表面保持其确定原子排列结构时,对CO2还原的电催化活性随晶面上(110)台阶密度的降低而减小,即Pt(210)>Pt(310)>Pt(510);当三个电极表面发生氧的吸附导致原子排列结构重建时,其电催化活性均有不同程度的提高.虽然其活性顺序未发生变化,但(110)台阶位密度越大的表面其电催化活性增加的程度越高.研究指出Pt单晶电极的表面结构越开放,其电催化活性也越高,并且在外界条件诱导下更易于转变为具有更高反应活性的表面结构.而相对有序的表面结构则比较稳定.研究结果从微观层次获得CO2与Pt单晶电极表面相互作用的规律,深化了对CO2电催化还原表面过程的认识.国家自然科学基金(批准号:20673091,20433060,20373059);; “973”计划(批准号:2002CB211804)资助项

    闽南文化研究国际笔谈会论点选载

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    2013年12月21日,由闽南师范大学闽南文化研究院主办的“2013闽南文化研究国际笔谈会“在国际学术交流中心召开。来自海峡两岸及日本、新加坡等国家的闽南文化研究方面的专家、学者二十余人出席了会议。会议围绕着闽南文化的内涵、外延及特征,闽南文化的当代价值与社会功能,闽南文化研究的理论与方法,闽南文化的跨文化阐释,闽南文化的世界性及其意义,闽南文化与两岸交流,闽南文化的生态保护,闽南文化学科建设与人才培养等议题展开了深入的研讨,言简意赅,探幽发微,对当下闽南文化理论研究势必产生积极的影响。本期节录专家们的精彩发言,以飨读者,也希望由此来带动和促进闽南文化研究的进一步升华

    On The Modeling Methodology of MEMS System-Level Simulation

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    实现集设计、加工及运行等整个过程的计算机仿真为一体的微机电系统的计算机辅助设计是微机电系统真正走向商品化的重要基础 .系统级仿真是 MEMS CAD最为关键的重要环节 .概括了 MEMS CAD的体系结构 ;着重介绍了适合于 MEMS系统级仿真的两个基本模型的基本思想、构造方法 .提出用加权残值法 (MWR)建立 MEMS系统级仿真模型 ;论述 MEMS系统级仿真的 MWR建模原理与方法 .提出运用演化算法进行自动化、智能化建模的基本思想 .教育部《高等学校骨干教师资助计划》;厦门大学自选课题资助项

    数字相位校准单元机

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    一种数字相位校准单元机,包括信号发生器、相位校准电路单元、频谱仪和示波器;所述相位校准电路为可变间隔梳状谱发生器,所述可变间隔梳状谱发生器分两路传递信号;第一路信号传递由信号发生器依次连接比较器、超高速与门芯片、微分电路和微波开关;第二路信号传递由梳状谱间隔设置单元与比较器产生的信号一并通过开关计数器,连接到微波开关;微波开关将两路信号处理后产生梳状谱,输出到频谱仪和示波器上。引入梳状谱间隔设置,可以兼顾窄带和宽带相位校准。并且基于全数字超高速集成电路设计,比模拟器件具有更好的稳定性、抗干扰性以及低廉的成本,电路分布也更加合理

    Ziprasidone versus other atypical antipsychotics for schizophrenia

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    JUNO Sensitivity on Proton Decay pνˉK+p\to \bar\nu K^+ Searches

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in pνˉK+p\to \bar\nu K^+ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+p\to \bar\nu K^+ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is 9.6×10339.6 \times 10^{33} years, competitive with the current best limits on the proton lifetime in this channel

    JUNO sensitivity on proton decay p → ν K + searches*

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the pνˉK+ p\to \bar{\nu} K^+ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+ p\to \bar{\nu} K^+ is 36.9% ± 4.9% with a background level of 0.2±0.05(syst)±0.2\pm 0.05({\rm syst})\pm 0.2(stat) 0.2({\rm stat}) events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is 9.6×1033 9.6 \times 10^{33} years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies

    JUNO sensitivity on proton decay pνK+p → νK^{+} searches

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