ZnSe/5B2O3-95SiO2纳米复合材料的制备及性能表征

采用溶胶凝胶工艺在室温合成合有Zn、Se成分和玻璃相成分的均匀透明凝胶，并通过CO还原气氛热处理，在凝胶玻璃中原位生长出ZnSe纳米晶体．利用BET比表面积、透射电镜、吸收光谱、荧光光谱等分析手段对ZnSe纳米复合材料的组成结构及量子尺寸效应影响下的光学性能进行了表征，结果表明：5B2O3—95SiO2凝胶玻璃的多孔结构可有效地分散ZnSe纳米晶粒；纳米复合材料中ZnSe纳米晶粒呈球形，粒径约为3．5nm；吸收光谱中，ZnSe纳米复合材料的吸收边相对于ZnSe体材料发生蓝移，随着ZnSe在凝胶玻璃中摩尔分数的增大，蓝移量减小，相应ZnSe纳米晶粒尺寸增大；在荧光光谱中，500nm附近的发光带是凝胶玻璃中的ZnSe纳米晶体表面态复合和缺陷发光，当ZnSe的摩尔分数达到0．07时，观测到了浓度的荧光淬灭现象．     

聚对苯二甲酸丙二酯/蒙脱土纳米复合材料的制备与表征

用原位缩聚的方法合成聚对苯二甲酸丙二酯／蒙脱土纳米复合材料(PTT／MMT)，所得的材料为剥离型纳米复合材料．通过DSC等测试手段研究了PTT／MMT纳米复合材料的结晶行为和热分解过程；测定了纳米复合材料的力学性能．结果表明，随着蒙脱土含量的增加，PTT／MMT的熔融结晶温度增高，其结晶过程为异相成核；纳米复合材料的力学性能有一定的提高．     

聚酰亚胺/蒙脱土纳米复合材料的制备与表征

用十六烷基三甲基溴化铵对钠基蒙脱土处理得到了有机土蒙脱，以均苯四甲酸酐和4，4‘-二氨基二苯醚为原料，利用溶液聚合原位插层法合成了聚酰亚胺／蒙脱土纳米复合材料．x-射线衍射(XRD)、红外分析(FTIR)测定了处理前后蒙脱土结构的变化，结果表明插层剂已进入到蒙脱土层阃并使层间距增大，扫描电镜(SEM)对材料的微相结构进行了分析，TCA测试了材料的热性能．     

PMMA/Ce(OH)3-Pr2O3/NanoG纳米复合材料的制备与表征

首次利用一种新方法(反胶束模板-原位聚合一步法)成功合成了聚甲基丙烯酸甲酯/Ce(OH)3-Pr2O3/石墨纳米微片复合材料.膨胀石墨在乙醇-水溶液中经超声处理制得石墨纳米微片,以甲基丙烯酸甲酯(MMA)为油相,稀土金属离子Pr3 ,Ce3 水溶液为水相,表面活性剂十六烷基三甲基溴化铵(TCAB)自组装形成的反胶束为模板,制备了PMMA/Ce(OH)3-Pr2O3/NanoG纳米复合材料.产物用CHCl3分散,涂于载玻片上,制得纳米复合材料薄膜.并用扫描电镜(SEM)、透射电镜(TEM)和差热-热重(TG-DTA)对该复合材料进行了表征和分析.     

金属-染料包覆共掺杂复合物的制备与热学特性

提出了一种基于包覆共掺杂结构金属纳米粒子偶氮染料复合物(MNPADC) 合成的新方法,可使偶氮染料甲基橙定向吸附于球形金属银纳米粒子表面形成染料对纳米粒子的包覆结构,再将具有该结构的掺杂剂掺于聚合物基质聚乙烯醇中,制备出MNPADC复合材料薄膜.紫外可见吸收光谱表明,该材料在波长为400~450 nm的波段具有良好的光吸收特性.热质量分析发现,其热学特性更适合于光存储的要求.实验结果表明,该材料的设计方法为改善有机光存储介质材料的热学性能提供了简便而有效的途径.     

基于Rhodamine 6G与Ag纳米粒子包覆掺杂型复合材料的合成

为避免传统的湿化学法制备有机一金属纳米掺杂复合材料中热处理给材料性能带来的不良影响，提出了一种新的工艺方法．室温下制备出有机-金属包覆掺杂型三元系复合材料体系．实现了染料分子对金属纳米粒子完全意义上包覆的设想．用电镜(TEM)观测了复合材料样品的显微结构，并对其UV—Vis吸收光谱进行了测量，给出了该包覆掺杂型材料的结构模型，并用所给模型成功地分析了实验结果产生的机理、     

纳米级粘土加入量对聚合物燃烧性能影响的研究

利用热重分析仪(TGA)测定了聚乙烯／粘土纳米复合材料(Polyethylene／Clay Nano-composites)热分解温度，以锥型量热仪(CONE)测定了聚酰胺6／粘土纳米复合材料(Polyamide6／Clay Nano—composites，PCN)的释热速率、质量损失速率以及引燃时间等参数。研究表明加入适量的粘土，聚乙烯／粘土纳米复合材料的初始燃烧温度可以提高20℃左右，聚酰胺／粘土纳米复合材料的释热峰值可下降41．59％，CO生成率减少24．1％，明显降低了聚合物的火灾危险性。     

聚吡咯纳米复合材料的研究进展

导电聚吡咯具有合成方便、电导率可调、易聚合等优点,而且具有特殊的光、电、热等性能,在导电聚合物中最具应用潜力。聚吡咯纳米复合材料是近年来出现的一种新型纳米材料,它既保留了聚吡咯的原有特性,还赋予了与之复合的材料的性能,成为许多前沿科研领域的重要研究方向。本文介绍了聚吡咯纳米复合材料的最新研究进展,综述了复合材料的主要类别及应用领域,并对聚吡咯复合材料的发展前景进行了展望。     

碳纤维-纳米金复合材料修饰电极检测ATP的研究

采用静电纺丝法和高温碳化法制备了碳纤维材料,进一步用水热合成法制备碳纤维-纳米金复合材料.将优化浓度的碳纤维-纳米金复合材料作为修饰剂固定于碳离子液体电极(CILE)的表面制得了碳纤维-纳米金修饰电极(CNF-Au/CILE),采用扫描电子显微镜考察了复合材料的表面形貌.最优实验条件下将该修饰电极用于ATP的检测,结果...     

膨胀石墨的多层次结构

采用扫描电镜、透射电镜、x—射线衍射等手段，研究膨胀石墨的内部结构特征．提出并证实膨胀石墨是由大量纳米级厚度(30一80nm)的微片组成．该纳米微片又由更薄的纳米级薄片构成(1．0-5．0nm)，且这些更细的薄片间存在间隙．膨胀石墨的这种结构特征，为聚合物／石墨纳米复合材料的制备提供了根据．     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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