周期磁场对二维电子气热学输运特性的影响

本文详细讨论了一维调制磁场中二维电子气的热传导系数及热电系数等热力学输运特性．磁场调制部分的存在使二维电子气的热力学输运系数中除了通常的ＳｄＨ振荡特性外还表现出与磁场调制周期相关的新的振荡特性．在低温条件下（Ｔ＝１，２Ｋ），各量均表现出Ｗｅｉｓｓ振荡和通常的ＳｄＨ振荡两种振荡特性．弱磁场（Ｂ０＜０．２Ｔ）时，ＳｄＨ振荡分辨不出来，只有Ｗｅｉｓｓ振荡；稍强磁场（Ｂ０＞０．２Ｔ）时，ＳｄＨ振荡开始出现．在稍高温度（Ｔ＝４，１０Ｋ）条件下，各物理量的ＳｄＨ振荡成份几乎完全消失，只剩下Ｗｅｉｓｓ振荡．     

一维周期调制磁场中二维电子气的热学输运特性

在线性响应理论的框架内讨论了一维调制磁场中二维电子气的热电系数Ｓμｖ，热传导系数ｋμｖ及热阻系数（ｋ＾－１）μｖ等热力学输运特性。结果表明，由于磁场调制部分的存在，使二维电子气的热力学输运系数中除了通常ＳｄＨ振荡特性外，还表现出与磁场调制周期相关的新的振荡特性，即Ｗｅｉｓｓ振荡。     

一种能削弱滑动模态抖振的方法

采用减少切换函数（分量）抖振幅值△ｓｉ的方法，能够削弱滑动运动的抖振．仿真结果表明这种方法是有效的．     

位相全场检测的全息网格法

在全息干涉术与光栅网格法耦合的基础上，提出了一种基于位相全场检测的全息网格法．它可用来直接测量固体表面的应变分量（εｘ，εｙ，εｘｙ），其应变测量灵敏度为８×１０－５，利用相移技术得到了光栅栅线图象的位相场，进而确定了光栅的栅距和倾角，结合变形理论实现对应变分量的直接测量．     

Fourier-Jacobi级数的de la Vallée-Poussin平均

讨论函数Ｆｏｕｒｉｅｒ－Ｊａｃｏｂｉ展开的ｄｅｌａＶａｌéｅ－Ｐｏｕｓｉｎ平均的性质，建立了ｄｅｌａＶａｌéｅ－Ｐｏｕｓｉｎ平均与最佳多项式逼近间的强型和弱型不等式．     

Boussinesq方程组解的存在唯一性和Fourier谱方法的误差估计

引入Ｆｏｕｒｉｅｒ谱方法逼近来解决Ｂｏｕｓｉｎｅｓｑ方程组周期初值问题局部广义解和古典解的存在唯一性问题．在给出了Ｆｏｕｒｉｅｒ谱方法逼近解的估计后，利用紧致性原理得到了Ｂｏｕｓｉｎｅｓｑ方程组周期初值问题局部广义解和古典解的存在性和唯一性．进一步加强初值条件的光滑性，得出了古典解的存在性．最后，给出了Ｆｏｕｒｉｃｒ谱方法的误差估计．     

矩形域上离散解二维Poisson方程的推广Fourier分析法

本文考虑在矩形域上解二维Ｐｏｉｓｓｏｎ方程边值问题的推广Ｆｏｕｒｉｅｒ分析法，边值问题的边界条件为一对边周期条件，另两边为Ｄｉｒｉｃｈｌｅｔ条件，或一边Ｄｉｒｉｃｈｌｅｔ条件、一边Ｎｅｕｍａｎｎ条件．这两个边值问题分别用五点差分格式和九点差分格式逼近，而在解离散的线性方程组时采用推广的Ｆｏｕｒｉｅｒ分析法．理论分析和数值试验表明：（ｉ）九点差分格式比五点差分格式精确，而计算量增加不多；（ｉｉ）推广的Ｆｏｕｒｉｅｒ分析法比通常的Ｆｏｕｒｌｅｒ分析法［１］优越，无论在计算时间或存贮量均较节省。     

Y1—xGdxBa2Cu3O7—δ超导体的磁场烧结致各向异性

在磁场下（Ｈ＝１．３Ｔ）烧结得到的Ｙ１－ｘＧｄｘＢａ２Ｃｕ３Ｏ７－δ）（ｘ＝０～１．０）系超导体表现出明显的电阻率ρ超导转变零电阻温度Ｔｃｆ和临界电流Ｊｃ各向异性，样品的常态电阻率在平行于烧结磁场方向上的值ρ比垂直于烧结磁场方向上的值ρ大８％～７０％，零电阻温度Ｔｃｆ∥比Ｔｃｆ┴大１．０～５．０临界电流Ｊｃ比Ｊｃ大９％～７３％，而且在外磁场（Ｈｔ＝２．０Ｔ）下测得的临界电流Ｊｃ随外扬Ｈｔ与烧结磁场     

半线性抛物组Cauchy问题的局部解和整体解的存在性

讨论一类半线性抛物组的Ｃａｕｃｈｙ问题，利用Ｆ．Ｂ．Ｗｅｉｓｓｌｅｒ对单个方程所引入的逐次逼近估计，经改进后，可明确得到Ｌｒ（ＲＮ）正解局部存在和整体存在的条件     

Fourier—Jacobi级数的de la Vallee—Poussin平均

讨论函数Ｆｏｕｒｉｅｒ－Ｊａｃｏｂｉ展开的ｄｅ ｌａ Ｖａｌｌｅ－Ｐｏｕｓｓｉｎ平均的性质，建立了ｄｅｌ ｌａ Ｖａｌｌｅｅ－Ｐｏｕｓｓｉｎ平均与最佳多项式逼近间的强型和弱型不等式。     

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