低温烧结多层片式ZnO压敏电阻内电极 Ag含量对电性能的影响

研究了低温烧成多层片式ZnO压敏电阻的内电极中Ag扩散进入ZnO晶格对电性能的影响．研究发现内电极中Ag含量严重影响低温烧结多层片式压敏电阻的电性能．当内电极含Ag量为70％时,具有最好的电性能;而内电极为纯Ag时,电性能最差,压敏电压和限制电压过分地升高,漏电流增大,非线性系数减小．反映晶界势垒电容的电容量随内电极中Ag含量的升高而减小．伏安特性和复数阻抗分析表明,随着内电极中Ag含量的升高,Ag扩散进入ZnO晶格加剧,降低了施主浓度Nd,导致ZnO晶粒电阻增大,以及晶界势垒高度和耗尽层宽度增加,使得多层片式ZnO压敏电阻的电性能变差．     

氧化锌/银双层膜负反馈阴极电极的制备及性能研究

提出了一种可显著改善碳纳米管(CNTs)场致发射性能的ZnO/Ag双层膜负反馈阴极电极的制备方法.在条形银电极上溅射沉积一定厚度的Zn膜,经热氧化和湿法刻蚀制备成ZnO/Ag双层膜电极.同单层的Ag或氧化铟锡电极相比,该电极不仅具有足够的负反馈电阻(限流电阻)阻止CNTs场发射中过流的发生,而且降低了条形阴极电极的线性电阻,确保了场发射的均匀性.当溅射沉积Zn膜的厚度从40 nm增到120 nm时,热氧化形成的ZnO由孤岛状的颗粒变为连续体的薄膜,ZnO/Ag双层膜电极的表面光洁度比单层的Ag电极有很大的提高,负反馈电阻层的电阻增大,负反馈的能力增强.CNTs薄膜阴极场发射特性曲线证明,ZnO/Ag双层膜电极能明显降低场发射电流的波动,有效提高器件的稳定性和寿命.     

Ag2O超级电容器的研究

用固相合成法制备Ag2O作为超级电容器材料,通过循环伏安与恒流充放电等测试手段对Ag2O电极及与作为负极的活性炭电极组成的电容进行分析.结果表明,在7mol·L-1KOH电解液中,Ag2O电极在0.15～0.35V(相对于Hg/HgO)的电压范围内表现出了法拉第电容特性.在不同电流密度下,电极比容量达427.3～554.9F·g-1,Ag2O/活性炭单体电容器比电容为42.5～61.65F·g-1.同时还对正极中Ag2O的含量及导电剂对Ag2O/活性炭单体电容器性能的影响进行了研究.     

微腔型传感器的电化学表征及其应用初探

利用微机械加工技术、各向异性腐蚀技术研制了具有三维结构的微腔型传感器 ,微芯片 3× 6mm2 具有三维腔体 腔深 3 0 0μm,铂工作电极 1 .2 1 .2 mm2 ,Ag/ Ag Cl参比 ,工作电极与 Ag/ Ag Cl参比集成在同一微芯片上 .作者对微腔型电极进行了电化学特性的表征 ,并测试了微芯片上 Ag/ Ag Cl参比电极的性能 ,考察了微腔型传感器在化学传感器、生物传感器方面的初步应用 ,对 H2 O2 ,半乳糖进行检测     

超薄Ag透明电极的厚度对半透明有机太阳能电池光伏性能的影响

基于热蒸镀法制备了超薄透明银(Ag)电极,将其利用在半透明有机太阳能电池中,研究了超薄Ag透明电极的厚度对半透明有机太阳能电池透射率和光伏性能的影响.测试不同厚度Ag透明电极的透射率发现,当Ag电极厚度由15 nm增加到20 nm时,可见光区的透射率逐渐降低.透明Ag电极的厚度在18 nm时,器件在可见光区的平均透射率...     

Ag与Ag20粉末微电极的循环伏安和电化学阻抗对比研究

在Ag电极化成为AgO时,发现只有Ag粉末电极可以氧化得到AgO,而Ag20则不行．分别将Ag和Ag20制作成粉末微电极,对它们进行了循环伏安（CV）和电化学阻抗谱（EIS）测试．通过对测试结果的分析可知,Ag被氧化为Ag20后,Ag电极分为内外两层,外层为富舍离子通道的Ag2O,便于OH-的进入;内层为导电性良好的Ag,便于Ag20氧化为AgO时电子的输出．而Ag20电极所含的离子通道较少,不利于OH-的进入;另外Ag2O的电阻较大,也不利于电子向外输出．这两方面原因使得Ag20电极不能被氧化为AgO．     

Ag与Ag_2O粉末微电极的循环伏安和电化学阻抗对比研究

在Ag电极化成为AgO时,发现只有Ag粉末电极可以氧化得到AgO,而Ag2O则不行.分别将Ag和Ag2O制作成粉末微电极,对它们进行了循环伏安(CV)和电化学阻抗谱(EIS)测试.通过对测试结果的分析可知,Ag被氧化为Ag2O后,Ag电极分为内外两层,外层为富含离子通道的Ag2O,便于OH-的进入;内层为导电性良好的Ag,便于Ag2O氧化为AgO时电子的输出.而Ag2O电极所含的离子通道较少,不利于OH-的进入;另外Ag2O的电阻较大,也不利于电子向外输出.这两方面原因使得Ag2O电极不能被氧化为AgO.     

固体参比电极的研究

研究了压片烧结的固体隔膜的制备和特性,并用此制备了无明显液流的Ag/AgCl固体参比电极。讨论了电极在部分溶液的电化学行为、原料、制备工艺对电极性能的影响,还提出了进一步改善电极性能的途径。     

微腔型传感器的电化学表征及其应用初探

利用微机械加工技术、各向异性腐蚀技术研制了具有三维结构的微腔型传感器，微芯片（3×6mm^2）具有三维腔体（腔深300μm，铂工作电极1．21.2mm^2，Ag/AgCl参比）。工作电极与Ag/AgCl参比集成在同一微 芯片上，作者对微腔型电极进行了电化学特性的表征，并测试了微芯片上Ag/AgCl参比电极的性能，考察了微腔型传感器在化学传感器、生物传感器方面的初步应用。对H2O2，半乳糖进行检测。     

GaN基LED中Ag/ITO复合膜的光电性能研究

制备含有不同厚度Ag(0.5、2、4nm)的Ag/ITO多层膜沉积在以蓝宝石为衬底的外延片上并与P-GaN相接触,经过一定的退火处理。研究了Ag厚度、退火温度、退火时间对Ag/ITO多层膜的透过率、方块电阻和接触电阻率的影响。得出这种光电性能优良的Ag/ITO膜作为P型透明电极应用于大功率LED有广阔的前景。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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