CuCl团簇组装薄膜的荧光红移现象

利用气相蒸发技术成功的制备了两个ＣｕＣｌ团簇薄膜样品．ＣｕＣｌ团簇被沉积到单晶Ｓｉ和石英衬底上,然后覆盖一层ＮａＣｌ以防氧化．通过透射电镜和选区衍射观察得知,两个样品主要由ＣｕＣｌ纳米晶和少量的Ｃｕ聚集体构成,其中ＣｕＣｌ纳米晶的直径分别约为３ｎｍ和６ｎｍ;通过室温下测得的光吸收和荧光光谱,发现ＣｕＣｌ激子吸收峰并未出现,而荧光峰向低能方向移动,这可能是激子声子强相互作用引起的结果．在７７Ｋ温度观察到由激子声子耦合而展宽的荧光峰,其峰值近似与量子限制模型的计算结果一致,同时观察到来自陷阱态的宽峰．通过比较３００Ｋ温度下激子荧光峰的展宽和红移量,发现团簇尺寸小的薄膜样品（３ｎｍ）中激子声子相互作用更强,这与理论预测定性一致     

用化学合成法制备ZnS∶Mn纳米晶

本文报道了一种用化学合成法制备硫化锌掺锰纳米晶的方法．制成的两种纳米晶直径分别为３．０ｎｍ和３．６ｎｍ，紫外吸收峰分别在２６１ｎｍ和２７７ｎｍ，相对于体材料吸收带边的３４０ｎｍ有明显的蓝移．用３１０ｎｍ光激发的发射光谱峰值分别为５７９ｎｍ和５８２ｎｍ，表明锰已掺入ＺｎＳ纳米晶之中．     

用化学合成法制备ZnS：Mn纳米晶

本文报道了一种用化学合成法制备硫化锌掺锰纳米晶的方法。制成的两种纳米晶直径分别为３．０ｎｍ和３．６ｎｍ，紫外吸收峰分别在２６１ｎｍ和２７７ｎｍ，相对于体材料吸收带边的３４０ｎｍ的明显的蓝移。用３１０ｎｍ光激发的发射光谱峰值分别为５７９ｎｍ和５８２ｎｍ，表明锰已掺入ＺｎＳ纳米晶之中。     

光诱致聚乙炔激子的产生和演化

在Su—Schrieffer—Heeger（SSH）哈密顿基础上引进弱电子关联,对反式聚乙炔链中单激子的产生和演化过程实施了分子动力学模拟．结果表明,弱关联的引入显著加快了激子的产生和演化,激子形成的时间由零关联的104fs缩短为48fs;弱关联未能使呼吸子的振荡周期发生显著改变,但呼吸子振荡成为等振幅恒频率模式．聚乙炔光诱致吸收试验中的瞬时高频吸收峰解释为呼吸子吸收．     

PNB聚合物的激子及其对静电场的响应

在Baranowski-Butterner-Voit模型的框架内，得到了PNB聚合物有限长开链的自隐激子态。研究了静电场对激子的影响，发现电场对激子的电荷密度、能级、据角序参量、键序位形都有较明显的影响；并使激子吸收峰从红外波段进入可见光波段。当电场超过0．74MV/cm时，激子解离成一对正反纽结孤子，此时，激子吸收峰分裂成1．1和1．4eV左右的两个峰，分别对应于电子型弧子和空穴型弧子。由此对实验上已观察到1．0和1．3eV两个短寿命低能吸收峰的成因作出了解释。     

邻苯二酚紫显色体系同时光度测定钨和钼的研究

研究表明，钨、钼与邻苯二酚紫（ＰＶ）、溴化十六烷基三甲基铵（ＣＴＭＡＢ）所形成三元络合物的最大吸收峰分别位于６６４ｎｍ和６７２ｎｍ，显色剂的最大吸收峰为４４０ｎｍ，对比度达２２０ｎｍ以上．有效地避免了显色剂吸收对测定的干扰。文章应用这一显色体系井结合多波长线性回归法，对合成样品中钨、钼进行了同时测定，所得结果满意。     

MoS2薄膜厚度与光学性能的相关性研究

采用低功率射频磁控溅射方法分别在玻璃和Si衬底表面沉积不同厚度的MoS₂薄膜,经硫化退火处理后,利用Raman光谱、AFM、UV-Vis光谱和45°镜面反射光谱,对MoS₂薄膜结构及光谱性质进行表征。结果表明,两种衬底上沉积的MoS₂薄膜经退火处理后均在670、615及400～500 nm处出现分别对应A、B、C激子的明显吸收峰和反射峰,表明所制MoS₂薄膜已结晶。A、B、C激子峰均随着薄膜层数增加而红移,表明MoS₂薄膜的能带结构随层数发生改变。另外,A、B激子峰位置不受光谱检测方式的影响,而45°镜面反射光谱中C激子峰则相对于UV-Vis光谱有一定红移,因此,可依据A、B特征激子峰的有无及峰位判定MoS₂薄膜的结晶度及层数,其中45°镜面反射光谱可用于非透明材料衬底上MoS₂薄膜厚度(或层数)的判定。     

卵磷脂的红外光谱和紫外光谱研究

本文采用红外分光光度法分析卵磷脂的吸收光谱，给出吸收峰的波数和相应的分子振动性质．考察ＣＣｌ４，ＣＨ２Ｃｌ２和ＣＨＣｌ３三种溶剂中卵磷脂的紫外吸收光谱，讨论溶剂极性对卵磷脂分子π－π＊电子跃迁吸收峰的影响，给出卵磷脂分子聚集体激子态跃迁吸收峰的位置．     

ZnS∶Tb纳米晶的制备和光学性质

用化学合成法在室温下制备掺铽硫化锌纳米晶的方法制成的三种纳米晶直径分别为３．６ｎｍ、３．８ｎｍ和４．１ｎｍ，紫外吸收带边分别在２８２ｎｍ、２８８ｎｍ和２９５ｎｍ，相对于硫化锌体材料吸收带边的３４０ｎｍ有明显的蓝移．用３３２ｎｍ光激发的发射光谱峰值分别为５４８ｎｍ、５４７ｎｍ和５４６ｎｍ，表明铽已掺入ＺｎＳ纳米晶之中．     

比色法测定二氧化氯的含量

根据二氧化氯与酪氨酸显色反应的特性，发现了除了４９０ｎｍ显色反应吸收峰外，３０６ｎｍ有一更强的吸收峰，同样可利用比色法测定二氧化氯的含量，该法测定二氧化氯的浓度范围可扩展为２．５－２５．０ｍｇ／Ｌ     

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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