配离子与表面增强拉曼散射

分析了银－分子系统的活位和配离子的性质，结果表明，配离子的地表面增强拉曼散射具有重要影响，即给银－碱必分子系统或银－酸性分子系统加入Ｃｌ＾－，Ｂｒ＾－，Ｉ等负离子时，ＳＥＲＳ信号分别增强或减弱。     

1993年我校科研工作取得显著成果

１９９３年我校科研工作取得显著成果１９９３年，我校有八项科技成果获得陕西省教委科技进步奖．其中物理系傅克德、苗润才、李永放等人完成的“Ｎａ２－Ｎａ，Ｌｉ２－Ｌｉ蒸汽系统中受激辐射、相干辐射及银表面－分子系统中ＳＥＲＳ的研究”和地理系甘枝茂、齐矗华、惠...     

一甲基硫脲与弱吸附无机阴离子的共吸附模型

用常规Ｒａｍａｎ光谱、电化学原位表面增强拉曼散射光谱（ＳＥＲＳ）和时间分辨ＳＥＲＳ光谱（ＴＲＳＥＲＳ）研究了甲基硫脲（ＭＴＵ）分别在ＨＣｌＯ４、Ｈ２ＳＯ４、ＨＮＯ３以及它们两两混合的酸性介质中与一种或两种弱吸附无机阴离子的共吸附行为。发现ＭＴＵ是以Ｓ端按σ配全吸附键的方式,在－０．２～－０．７Ｖ的较正电位区间偏向于甲基一侧倾斜吸附在银电极表面上;在－０８～－１．２Ｖ的较负位区间,则偏向于甲基一侧斜     

银片SERS信号随光照时间的变化关系

对刻蚀银片基底吸附分子ＳＥＲＳ效应随光照时间变化进行了研究，发现其ＳＥＲＳ强度随光照时间呈下降趋势；掺入Ｃｌ－１离子的影响与光照有关，随光照时间的增加，分子的拉曼强度出现反转．     

MFI型沸石填充硅橡胶分离膜的制备、结构与性质

用ＺＳＭ－５沸石或硅沸石（ｓｉｌｉｃａｌｉｔｅ－１）填充硅橡胶制成了疏水性分离膜，它对有机溶剂／水系统的渗透蒸发性能与膜的组成、结构以及吸附、脱附行为有关．所填充的沸石结构性质（如硅铝比、阳离子、Ｓｉ－ＯＨ缺陷以及结晶度等）是影响膜分离性能的关键因素．用结构完美、疏水性优良的硅沸石制备的填充膜其乙醇／水的分离系数α可达３０．基材硅橡胶本底的分离性质也影响填充膜的性能．填充膜对正丙醇／水、异丙醇／水、丙酮／水系统的分离效果不同与这些有机分子的分子尺寸及极性有关．本文还研究了填充膜的机械性能随填充量改变的规律．     

钩藤碱的TLC-FT-SERS研究

本文报道了应用表面增强技术将薄层色谱（ＴＬＣ）与傅立叶变换拉曼光谱（ＦＴ－Ｒａｍａｎ）联用,获得了中草药钩藤中的钩藤碱光谱研究的新方法。研究表明,在薄层原位２．５ｕｇ多心藤总碱,即可很好的分离出多心藤碱等多种钩藤生物碱。应用薄层原位表面增强（ＴＬＣ－ＦＴ－ＳＥＲＳ）技术,获得钩藤碱分子的特征振动谱带,进而阐述了样品分子在表面增强基底银胶表面的吸附模式,钩藤碱以分子中甲氧基Ｏ原子的孤电子对吸附于银晶     

硒（Ⅳ）—碘化物—维多利来蓝4R体系共振瑞利散射,二级散？…

在０．１６～０．３２ｎｏｌ／Ｌ的盐酸溶液中，维多利亚蓝４Ｒ（ＶＢ４Ｒ）的共振瑞利散射（ＲＲＳ）、二级散射（ＳＯＳ）和倍频散射（ＭＦＳ）均十分微弱。在过量碘化物存在下，当硒（Ⅳ）氧化Ｉ＾－形成Ｉ３＾－配阴离子并进一步与ＶＢ４Ｒ反应形成离子缔合配合物时，３种散射均大大增强并产生相应的散射光谱。最大ＲＲＳ波长位于５８２ｎｍ，另在３２０ｎｍ，４１０ｎｍ，４５２ｎｍ，４７０ｎｍ，８００ｎｍ和９４０ｎｍ处有强     

The Study on the Electronic Structure of the Compound N-(2′,4′,5′,-Trichloro) Phenyl-2- Hydroxyl-3,5,6-Trichlorobenzenesulfonamilide

使用半径验分子轨道计算得到了化合物Ｎ－（２′,４′,５′－三氯）苯基－２－羟基－３,５,６－三氯苯磺酰胺的一些电子性质,用分子力学程序ＭＭＰ２得到了该化合物的分子几何构型和稳定构象．计算时使用的参数取自对分子Ｎ－甲基甲基磺酰胺的ａｂｉ－ｎｉｔｉｏ计算研究和Ｘ－光晶体衍射结果．研究表明：原子Ｓ和Ｎ形成ｄ－ｐ配价键,通过此键,其电子进一步与两边的取代苯环共轭,ｄ－ｐ配价键对分子中的电子离域可能起着一个重要的桥梁作用．这种结构的分子,一方面将提高分子中Ｏ－Ｈ和Ｎ－Ｈ键上质子的酸性,另一方面将使不同构象之间的转换容易进行,该化合物作为药物易于与环境中的膜／水膜介面形成匹配的结构．这些因素均与它的杀虫活性有关     

D001CC强酸性树脂吸附分离金银

介绍了用Ｄ００１ＣＣ大孔强酸性阳离子交换树脂从硫脲浸金液中吸附分离金和银的性能。结果表明,在酸性介质中,该树脂对硫脲金（Ａｕ（Ｔｕ）２＋ ）、硫脲银（Ａｇ（Ｔｕ）２＋ ）配离子（Ｔｕ＝ ＣＳ（ＮＨ２）２）均有良好的吸附性能。吸附容量Ａｕ 为６８．８ｍ ｇ／ｇ－Ｒｅｓｉｎ,Ａｇ 为９９．１ｍ ｇ／ｇ－Ｒｅｓｉｎ。负载金银的树脂可分别用ＮａＣＮ－ＮａＯＨ 溶液和Ｎａ２Ｓ２Ｏ３ 的Ｈ３ＢＯ３－ＮａＯＨ 缓冲溶液定量洗脱,达到了一定程度的金银分离     

东莨菪碱在薄层色谱原位的傅立叶变换表面增强拉曼光谱研究

利用高效薄层色谱（ＴＬＣ）分离技术与表面增强拉曼散射技术（ＳＥＲＳ）的结合，获得了分析东莨菪碱成分的新方法．ＳＥＲＳ结果表明，在ＴＬＣ原位约８μｇ样品就可获得东莨菪碱分子的主要振动特征谱带．通过光谱检测揭示出ＳＥＲＳ与固体光谱的异同，并指明了东莨菪碱分子与银溶胶的吸附模式．ＴＬＣＳＥＲＳ使高效分离与指纹鉴定结合，可对化学成分进行高灵敏度检测     

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

正~~