抗坏血酸在钼蓝法测定微量SiO2中的应用

研究了以抗坏血酸为还原剂，用光度法测定碳化硅超细粉中微量ＳｉＯ２的方法，结果表明，最大吸收波长为８００ｎｍ，表观摩尔吸光系数为２．５０＊１０＾４Ｌ／（ｍｏｌ．ｃｍ），线性范围为０．０５－０．０７ｍｇ／Ｌ，平均回收率为９９．３２％，ＲＳＤ为１．６７％，该法适用于碳化硅超细粉中微量ＳｉＯ２的测定。     

高纯超细氧化铝粉制备方法的对比研究

以不同原料，分别对制备高纯超细氧化铝粉的静态热分解法及喷雾热分解法进行对比研究，对影响粉体质量的诸因素作了具体分析与对比。获得纯度大于９９．９８％，细度为０．１６～０．２μｍ的α－Ａｌ２Ｏ３超细粉。     

异丁醇的内扩散对—0.6级速度方程的影响

在Ｐｔ／ａＬ２ｏ３催化剂上，用外循环无梯度反应器研究了异丁醇内扩散对异丁醇完全氧化动力学的影响。用０．４５￣０．６０ｍｍ催化剂，反应在动力学区域进行，异丁醇完全氧化的动力学用－０．６级速度方程描述。当催化剂颗粒增大到４ｍｍ时，反应受内扩散控制，在内扩散区域异丁醇反应级数变为－０．０１级。测定了催化剂有效因子η，其值在０．２１￣０．６１之间。它表明孔扩散阻力严重。在温度恒定时，ηｅｘｐ值随异丁醇分压     

异丁醇的内扩散对－0．6级速度方程的影响

在Ｐｔ／Ａｌ２Ｏ３催化剂上，用外循环无梯度反应器研究了异丁醇内扩散对异丁醇完全氧化动力学的影响。用０．４５～０．６０ｍｍ催化剂，反应在动力学区域进行，异丁醇完全氧化的动力学用－０．６级速度方程描述。当催化剂颗粒增大到４ｍｍ时，反应受内扩散控制，在内扩散区域异丁醇反应级数变为－０．０１级。测定了催化剂有效因子η，其值在０．２１～０．６１之间。它表明孔扩散阻力严重。在温度恒定时，ηｅｘｐ值随异丁醇分压的升高而增加。在异丁醇分压固定时，ηｅｘｐ值随反应温度升高而下降。反应在动力学区域时，异丁醇完全氧化的活化能为２６．０ｋＪ／ｍｏｌ，而在内扩散区域时，反应活化能为２３．７ｋＪ／ｍｏｌ。     

Co－Sn替代钡铁氧体的制备及其磁性

用化学共沉淀工艺制备了可望用作高密度垂直磁记录介质的Ｃｏ－Ｓｎ替代钡铁氧体系列微软样品ＢａＦｅ＿（１２－２ｘ）Ｃｏ＿ｘＳｎ＿ｘＯ＿（１９），其中ｘ可取值为０，０．２，０．４，０．５，０．６，０．８，１．２．给出了最佳制备条件：反应温度ｔ＝８０℃，体系的ｐＨ值ｐＨ＝１１．８，热处理温度Ｔ＿ｈ＝９２５℃。对所制备的系列样品进行了透射电镜（ＴＥＭ）观测和ｘ光衍射（ＸＲＤ）测试，给出了颗粒的形貌和大小以及晶体结构和晶格常数。用振动样品磁强计（ＶＳＭ）对宏观磁性进行了测试，给出了宏观磁性与替代浓度关系。     

La1—xAgxMnO3多晶非均匀匀颗粒系统的巨磁电阻效应

采用固相烧结法制备了名义成分为Ｌａ１－ｘＡｇｘＭｎＯ３（０≤ｘ≤０．５０）的大块多晶样品，并且首次研究了它们的巨磁电阻效应，分析表明：当ｘ≤０．２５时，样品基本上由单一的钙钛矿结构相组成；当ｘ〉０．２５时样品明显由两相组成，钙矿结构相和富Ａｇ合金相，它们组成了一个非均匀的颗粒系统，在ｘ＝０．３０时，具有高达２５．５％的巨磁电阻效应，非均匀颗粒系统呈现的磁电阻效应与电子在两相颗粒界面的自旋相关散射有     

磷渣超细粉混凝土的流动性、抗压强度与耐久性研究(英文)

磷渣超细粉的比表面积大于６０００ｃｍ２／ｇ,它和矿渣细粉一样都是玻璃态物质。通过对磷渣超细粉和矿渣细粉的比较研究发现,磷渣超细粉取代部分水泥后可以改善混凝土的流动性、强度和耐久性。按磷渣超细粉２７５ｋｇ／ｍ３、普通硅酸盐水泥２７５ｋｇ／ｍ３、水胶比０．２６、超塑比剂９．７ｋｇ／ｍ３配制的混凝土坍落度为２４０ｍｍ,２８ｄ抗压强度为１０１ＭＰａ,氯离子扩散系数较普通水泥混凝土降低１／３。     

用颗粒相双尺度二阶矩湍流模型模拟突扩两相流动

基于将颗粒脉动分成湍流引起的大尺度脉动和颗粒间碰撞产生的小尺度脉动的概念，应用单相流动多尺度湍流模型方法，从双流体模型出发，推导和封闭了颗粒的双尺度脉动雷诺应力方程、大尺度脉动能量传递率方程、小尺度脉动耗散率方程和两相脉动关联方程，用统一的湍流模型方法构造了包含颗粒两类脉动的新的颗粒双尺度二阶矩两相湍流模型．用该模型对突扩管内的两相流动进行了数值模拟，并和单尺度的二阶矩两相湍流模型进行了比较，计算结果和实验数据吻合较好，比单尺度的二阶矩两相湍流模型的计算结果有所改进．     

溶液聚合法合成热固性丙烯酸粉末涂料用树脂

用溶液聚合方法合成含羟基热固性丙烯粉末涂料用树脂。单体配比为：“硬“组分６０ｗｔ％～８０ｗｔ％、“软“组分１０ｗｔ％～２０ｗｔ％、交联组分１０ｗｔ％～２０ｗｔ％，溶剂是丁酮和甲苯的混合溶剂，单体对溶剂的重量比０．６７～１．０：１．０。引发剂ＡＩＢＮ的用量是单体重的１．５％～４．０％。在回流温度下，反应３ｈ，制得符合制造粉末涂料要求的树脂。     

甘草酸单铵和无环鸟苷伍用体外抗单纯疱疹病毒作用

在组织培养系统中，甘草酸单铵和无环鸟苷伍用产生一定的相加抗Ⅰ型单纯疱疹病毒作用．两药伍用的最低剂量分别为１．０ｍｇ／ｍＬ和０．１２５μｇ／ｍＬ．在伍用浓度下，没有任何干扰和抵消作用，同时也未发现对细胞的毒性作用．两药合用可能为无环鸟苷的用药开辟新途径．     

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