Fe—Re合金高温摩擦特性研究

熔制了６种不同含铼量的Ｆｅ－Ｒｅ合金，通过测定合金磨擦系数和磨损率，找出了合合适的含Ｒｅ量。Ｆｅ－Ｒｅ合金高温摩擦后表面形成釉质层，它由延性氧化物及变化形合金组成的亚表层所支持。承载氧化层中高硬度台阶的出现是合金高温耐磨的根据，在磨屑及氧化层中分布有铼的氧化物及铼酸铁则起 高温润滑作用。     

纺锤型γ－FeOOH的合成及其热分析研究

采用空气氧化ＦｅＳＯ４与Ｎａ２ＣＯ３作用生成的Ｆｅ（ＣＯ３）ｘ（ＯＨ）２（１－ｘ）悬浮液体系，通过稀土离子Ｙ３＋的掺杂合成出均匀纺锤型铁黄γ－ＦｅＯＯＨ微晶．由ＤＴＡ－ＴＧ和ＸＲＤ分析得出γ－ＦｅＯＯＨ随温度升高，发生如下相变过程：γ－ＦｅＯＯＨ→γ－Ｆｅ２Ｏ３→α－Ｆｅ２Ｏ３．本文还对γ－ＦｅＯＯＨ的脱水过程机制和以γ－ＦｅＯＯＨ为中间体经热处理制备的纺锤形γ－Ｆｅ２Ｏ３磁性能作了初步探讨．     

FeO4^2—离子在水溶液中稳定性的研究

报导氢氧化铁对ＦｅＯ４＾２－水解反应的催化作用及温度、浓度、碱度等对ＦｅＯ４＾２－稳定性的影响ＦｅＯ４＾２－的稳定性随体系中Ｆｅ（ＯＨ）３的增多和ＦｅＯ４＾２＿浓度增大而变小;当ＯＨ浓度低于１．０ｍｏｌ／Ｌ时,ＦｅＯ＾４＾２－的稳定性不受碱度影响;在室温下,ＦｅＯ４＾２－的稀溶液是稳定的。用这些重要规律指导高铁钾的合成,取得满意的结果。     

原位反应生成Al-Fe/Al_2O_3,Al-Cu/Al_2O_3复合材料的过程原理

采用喷射共沉积法制备了Ａｌ－Ｆｅ２Ｏ３及Ａｌ－ＣｕＯ复合体，Ｆｅ和Ｃｕ的质量分数分别为９．６０％和５．５０％．在热处理过程中，随着温度由６００℃升高到８００℃和１０００℃，Ｆｅ３Ｏ４按Ｆｅ３Ｏ４ＦｅＯＦｅ顺序被还原，得到Ａｌ－Ｆｅ／Ａｌ２Ｏ３复合材料，其中Ｆｅ以Ａｌ１３Ｆｅ４相及ＡｌＦｅ相形式存在．Ａｌ２Ｏ３粒度为２～４μｍ均匀分布在基体中．Ａｌ／ＣｕＯ复合体在９００℃处理后，形成Ａｌ－Ｃｕ／Ａｌ２Ｏ３复合材料．文中对显微结构形成、反应进行的过程作了分析．     

掺锑α－Fe_2O_3超微粉材料的晶粒生长、微结构与气敏特性

用化学共沉淀法制得掺有一定量锑离子的α－Ｆｅ２Ｏ３，超微粉料．ＴＧ－ＤＴＡ、ＸＲＤ及ＳＥＭ等分析表明，掺锑量（Ｓｂ／Ｆｅ原子比）小于０．２时，材料仍保持α－Ｆｅ２Ｏ３的晶体结构，但其晶化温度随Ｓｂ含量的增加向高温区移动；在低温段纯α－Ｆｅ２Ｏ３的晶粒生长活化能（Ｑ＝１０．３ｋＪ／ｍｏｌ）远小于Ｓｂ／Ｆｅ＝０．１（Ｑ＝３５．３ｋＪ／ｍｏｌ）粉料的活化能；Ｓｂ５＋取代α－Ｆｅ２Ｏ３晶粒中Ｆｅ３＋格位与在４５０℃下长期工作粉料颗粒不易长大，是造成掺锑α－Ｆｅ２Ｏ３元件电阻降低一个多数量级及气敏性能显著改善的主要原因．     

工业条件下铁钼氧化物催化剂上甲醇氧化反应的复杂振荡

在工业条件下，观察到甲醇在Ｆｅ２（ＭｏＯ４）３－ＭｏＯ３催化剂上的氧化反应发生强烈的自振荡，反应温度及尾气成分呈现周期性变化。振荡参数与反应温度、进料流速以及原料气中甲醇浓度有关，但不受原料气中氧浓度的影响，用原位红外技术检测到ＭｏＯ３及Ｆｅ２（ＭｏＯ４）３中Ｍｏ＝Ｏ双键的振荡有着不同的相位，说明振荡过程伴随着晶格氧的转移及金属离子价态的变化。这些变化造成反应速度的负反馈，从而产生振荡。用多种手段研究了铁和铂之间的协同效应，并提出了协同作用机理及避免振荡的措施。     

固体（NH_4）_2SO_4－Fe_2O_3体系的IR和XPS研究

用红外光谱（ＩＲ）和Ｘ射线光电子能谱（ＸＰＳ）对用研磨法制得的（ＮＨ４）２ＳＯ４－Ｆｅ２Ｏ３样品进行了表征。并将表征结果与其催化性能关联。研究结果表明，热处理时存在着（ＮＨ４）２ＳＯ４在Ｆｅ２Ｏ３表面上自发分散过程。同时在表面形成Ｓ－Ｆｅ配合物。随着处理温度的升高，表面Ｓ－Ｆｅ配合物含量逐步增大，５７３Ｋ时达极大值。此时催化反应活性最大。超过５７３Ｋ，随着处理温度升高，表面Ｓ－Ｆｅ配合物分解，此时催化反应活性也相应降低。     

铁基合金上几种常见氧化层开裂及剥落的声发射研究

用声发射（ＡＥ）技术研究了铁基合金上几种常见氧化层在恒温氧化和随后冷却过程中发生的开裂及剥落行为。获得了ＡＥ累积计数及温度对时间的变化曲线。通过显微镜、扫描电镜的观察和Ｘ射线射衍物相分析，确定了实验合金表面氧化层的主要物相。结果表明：除了加Ｓｉ合金的氧化层在恒温氧化过程已开裂外，其余合金的氧化层均在冷却时开裂并剥落。Ｆｅ２５Ｃｒ－１０Ａｌ合金上α－Ａｌ２Ｏ３层的开裂及剥落最为剧烈。Ｆｅ－２５Ｃｒ－７．５Ｎｂ合金的Ｃｒ２Ｏ３层ＡＥ总计数远远高于Ｆｅ－２５Ｃｒ合金。而Ｆｅ－２５Ｃｒ－４Ｔｉ和Ｆｅ－２５Ｃｒ－９Ｍｎ的情况与Ｆｅ－２５Ｃｒ大体相同。     

α－Fe_2O_3（SO_4~（2－））气敏材料的红外吸收谱

研究了α－Ｆｅ２Ｏ３（ＳＯ）气敏材料和Ｆｅ２Ｏ３试剂和在不同烧成温度和工作温度下的红外吸收性质，结果表明ＳＯ改变了α－Ｆｅ２Ｏ３的结构状态，使ａ－Ｆｅ２Ｏ３产生氧吸附功能，从而获得气敏性。     

Fe（Ⅱ）离子对γ—FeOOH相转化为α—Fe2O3的影响

研究了ＦｅＳＯ４浓度及ｐＨ值（４～８）对γＦｅＯＯＨ在（９９±１）℃下相转化为αＦｅ２Ｏ３的影响．结果表明，Ｆｅ（Ⅱ）／Ｆｅ（Ⅲ）为３％～５％及ｐＨ值为近中性时相转化时间最短．指出Ｆｅ（Ⅱ）离子对γＦｅＯＯＨ的促进作用为ＦｅＯＨ＋吸附在γＦｅＯＯＨ表面使其溶解造成的．     

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