硫酸钡纳米粒子制备方法研究

研究了制备纳米BaSO4粒子的多种制备方法，用透射电子显微镜和激光粒度分析仪对合成纳米粒子的形貌、大小及粒度分布进行了表征分析，实验发现不同制备方法对纳米粒子大小及形貌均有影响，同时各种制备方法所得的纳米BaSO4粒子平均粒径小、分布窄，并探讨了各种方法的反应机理．     

水热微乳液法合成氧化钇粉体前驱体

以草酸钠和硝酸钇为原料,CTAB和OP为复配表面活性剂,正戊醇为助表面活性剂,环己烷为油相,草酸钠和硝酸钇水溶液组成反相微乳液体系并结合水热法制备氧化钇粉体前驱体.用热重-差示扫描量热法分析前驱体的分解过程,用X射线衍射仪和扫描电镜对产物的结构、粒度和形貌进行表征.结果表明,所得前驱体粉体为片状,厚度为200 nm,边长2μm,将前驱体煅烧后得到的产物为粒度分布均匀、纯度高、立方晶系的氧化钇,最后对前驱体进行了Eu3+掺杂,然后经过煅烧,利用荧光分光光度计研究了煅烧产物的发光性能.     

聚乙烯粉末粒度及粒度分布测定的研究

用乙醇做分散介质,用激光粒度测定仪测定三个聚乙烯粉末试样的粒度及粒度分布,测试快速、准确。试验结果令人满意。     

纳米尺寸聚合物胶乳及其粒径分布

用半连续乳液聚合法合成了粒径为５０ｕｍ～１００ｕｍ的苯乙烯－丙烯酸了酯－丙烯酸共聚物胶乳，讨论了搅拌速度等其它因素对胶乳粒度及分布的影响．实验表明，增加乳化剂量有利于胶乳粒度减小，但超过一个阔值将使粒径分布变宽．     

用煤系高岭土制取白炭黑的研究

介绍了以煤系高岭土为原料制备白炭黑的新方法。详细考察了高岭土活化温度、酸度、酸量、反应时间等对白炭黑物化参数的影响，并分别用X射线衍射、扫描电子显微镜、激光粒度仪及N2静态容量吸附法等物理手段测试了白炭黑的物相结构、表观形貌、二氧化硅含量、粒度及比表面积和孔结构。结果表明，用该方法制得的白炭黑比表面和纯度远远高于国家标准，并且中孔孔隙结构发育，粒度分布集中。     

煤超细研磨过程的数学模型研究

本文提供了一个基于自相似原理的简单方案,用它预测整体的粒度分布。这些自相似曲线仅仅取决于入料特性和磨机的类型,而与磨机的大小及操作状态无关。通过实验测定和分析,在给定单位输入功的条件下,计算出的煤产品粒度分布与实测结果非常吻合。     

一种铬酸铅制备新工艺的研究

采用以加热转化,硝酸溶解提取,重铬酸钠合成为主要步骤的制备新工艺,用草酸泥渣制得了铬酸铅.对用草酸泥渣制备铬酸铅的工艺原理进行了分析.本文着重研究了原料粒度、反应温度、反应时间和硝酸用量等因素对产品产量和铬酸铅含量的影响.     

烧结矿分形特征

概括了分形理论的基本概念和分形维数的计算方法，总结了在显微分析中的分形模型和分析方法，利用分形分析方法研究了烧结矿材料的粒度分布、孔隙结构，结果发现：烧结矿的粒度分布和孔隙结构具有分性特征，粒度的分维值是评价烧结矿粒度组成情况的一个定量指标，也是材料破碎过程中断裂阻力的一种量度：烧结矿的微孔隙具有多层次的自相似性，烧结矿的分形特征与烧结过程中孔隙的形成机理有关。     

凿岩粉尘粒度分布的分形结构

本文应用分形几何理论研究了矿山凿岩时岩粉粒度分布的分形特征。研究发现岩粉粒度分布具有良好的分形结构。岩粉粒度大小的分布具有良好的分形结构。岩粉粒度大小的分布可用分维值定量地描述。建立岩粉的分维值与凿岩参数的关系很有必要，它能为控制岩粉粒度和凿岩参数优化提供有效的依据。     

用粒度分布法评价聚合醇抑制剂的方法研究

使用激光粒度仪对聚合醇钻井液处理剂抑制黏土水化分散的性能进行了研究，较好地解决了页岩膨胀法和岩屑回收率法不能评价该处理剂抑制性的问题。在评价实验中，选用安丘伊利石和高岭土为评价用土，在固定的搅拌速度和搅拌时间下，测定了该土在清水中分散后的粒径分布，得出5μm以细的粒子含量及粒径中值。制定了测定粒度分布的实验步骤及聚合醇钻井液性能指标要求：5μm以细的粒子含量≤20．0％，粒么或值≥12．0μm。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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