AgCl膜光催化降解色素的研究

利用AgCl膜在不同波长光照条件下对水溶液中的5种有机色素进行催化降解实验．实验结果表明，30min内，5种色素(质量浓度为20mg/L)均得到迅速光解，且在太阳光光照条件下AgCl膜具有非常高的光催化性能．并进一步研究了成膜原料液的浓度对光解率的影响、溶液初始质量浓度与光解速率的关系及悬浮态AgCl的光催化对比实验．     

结晶紫参与的液膜振荡体系

以结晶紫为表面活性剂，研究了油水界面膜上的非线性行为．结果表明，在一定的浓度范围内，电势的规则振荡与化学混沌交替出现．提出了用老化时间变化解释液膜振荡频率衰减的观点。     

酸性溶液中碳钢上钝化膜的生成和溶解

碳钢上的钝化膜为不均匀膜,其稳定性比纯铁的钝化膜低,并随酸度的降低和钝化时间的增长而增加。在0.8V钝化一个半小时后,开路电位衰减曲线出现两个平台。采用方波迭加法模拟了电流振荡现象。     

镶嵌铜多孔铝膜透射光谱曲线中干涉现象的研究

用阳极氧化的方法制备了阳极氧化铝膜,向其孔中镀入了铜,然后利用UV-3101PC型分光光度计进行了透射光谱测试.实验结果表明,在其可见光和近红外光波段的透射曲线中有明显的振荡现象.利用Maxwell-Garnett理论,分析了这种振荡现象产生的原因,从理论上说明了这种振荡现象是由薄膜干涉引起的,最后提出了用冷杉胶将多孔铝膜胶合在两BaF2窗口的方法,有效消除了透射光谱曲线中的干涉效应.     

涂碳(石墨)PVC膜苦味酸根离子选择电极

关于涂碳(石墨棒)PVC膜离子选择电极的研制已见文献(Ca~(2+)电极)的报导,文献(ClO_4~-电极)的讨论中也有简述。这种电极把PVC膜直接粘在石墨碳棒上,省去了一般PVC膜电极的内参比溶液和Ag/AgCl或Ag/AgBr内参比电极,从而使电极更加简化易制、使用方便。此种形式的苦味酸根电极尚未见报导。     

萃取法制备氯化银纳米有机溶胶

采用油酸萃取并包覆AgCl纳米水溶胶粒子,制备了AgCl纳米有机溶胶,对有机溶胶的制备条件进行了系统的研究,获得了最佳的制备条件。对制得的AgCl纳米有机溶胶进行了表征。TEM分析表明,AgCl纳米粒子呈球形,粒径约50nm,粒径分布均匀,无明显团聚现象;ED分析表明,AgCl纳米粒子为多晶结构,其中有少量的单晶存在。表面包覆油酸的AgCl纳米粒子易分散于弱极性溶剂,难分散于极性溶剂,表明油酸对AgCl粒子进行了较好的包覆。     

碳钢在硫酸溶液中的钝化和振荡

研究了碳钢电极在硫酸溶液中的钝化和电流振荡行为。发生振荡的电位范围仅在钝化电位附近。振荡电流反映了电极活化、钝化过程的交替变化,其大小、周期和峰宽都随着溶液 H_-~+离子浓度改变而变化。振荡电流的形状亦与 H_-~+离子浓度有关。振荡原因是钝化膜的结构和组成的不均匀,它反复地生成和溶解,使电极表面交替钝化和活化,致使电流振荡。     

粉末溅射SnO2:Pt薄膜及SnO2/SnO2:Pt薄膜电导在CO中的振荡现象

采用粉末溅射方法制备了体掺杂型SnO2 :Pt薄膜和SnO2 /SnO2 :Pt双层膜 .这两种薄膜材料不仅对CO气体有很高的灵敏度 ,良好的选择性和较低的工作温度 ,而且其电导在CO气体中均出现了振荡现象 .本文分析了电导振荡温区、振幅和频率与CO气体浓度及膜厚的关系 ,介绍了其振荡特性并对有关问题进行了讨论     

光谱图像的标准具效应

在进行光谱数据测量时,在原本平坦的光谱中常会出现类似正弦的周期振荡,称为标准具效应(Etaloning effects).标准具效应严重影响了系统的测量精度和数据后续处理的难度.从光学系统表面光学膜层方向来分析这种类似正弦振荡的现象,并针对与多膜层相似结构的法布里珀罗结构,分析找到这种标准具效应的主要原因是膜层结构影响,同时提出了通过改变光学结构表面膜层来改善和消除这种影响测量结果的标准具效应.最后在软件和硬件方面都提出了相应的改善方法.     

粉末溅射SnO2：Pt薄膜及SnO2／SnO2：Pt薄膜电导在CO中的振荡现象

采用粉末溅射方法制备了体掺杂型ＳｎＯ２：Ｐｔ薄膜和ＳｎＯ２／ＳｎＯ２：Ｐｔ双层膜,这两种薄膜材料不仅对ＣＯ气体有很高的灵敏度,良好的选择性和较低的工作温度,而且其电导在ＣＯ气体中均出现了振荡现象,本分析了电导振荡温区、振幅和频率与ＣＯ气体浓度及膜厚的关系,介绍了其振荡特性并对有关问题进行了讨论。     

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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