一类Mbius变换在区域自同构中的应用

研究了复平面中区域的自同构问题.通过一类Mbius变换,给出了区域的任一自同构的表示形式;在区域和单位圆盘共形等价的条件下,证明了区域到单位圆盘的所有解析函数的导数在区域给定点处的模的上确界是可达的.     

Dirichlet空间上一类特殊符号的Toeplitz算子

讨论了单位圆盘上Sobolev空间中解析函数组成的子空间Dirichlet空间上,以拟齐次函数为符号的Toeplitz算子,得到了此类Toeplitz算子的有界性和紧性的等价条件.     

右半圆盘区域上的Hardy空间

主要通过保形映射进行等价处理的方法对右半圆盘上的Hardy空间进行刻画,得到了右半圆盘Hardy空间的定义、Blaschke乘积、分解定理,对右半圆盘区域上的Hardy空间函数的非切向边界极限进行刻画,并且给出了右半圆盘上的Hardy空间的等价空间,由此对右半圆盘Hardy空间上的有理函数进行刻画,为进一步研究右半圆盘区域上的有理函数逼近提供理论依据.     

多复变Toeplitz算子的等价性

设Ω表示ｎ维复空间Ｃｎ中的单位球Ｂｎ或单位多重圆盘Ｄｎ，本文讨论Ｈａｒｄｙ空间Ｈ２（Φ）上的解析Ｔｏｅｐｌｉｔｚ算子组与坐标乘子组的联合酉等价及Ｈｐ（Φ）上等距同构的Ｔｏｅｐｌｉｔｚ算子．     

Bergman空间上等距的复合算子乘积

考虑Bergman空间上的复合算子Cφ和Cψ,利用Bergman空间上等距的复合算子的性质,给出了算子乘积CφC*ψ和C*ψCφ成为Bergman空间上的等距算子、酉算子的充要条件,同时证明了CφC*ψ是等距的当且仅当它是酉算子,而且还等价于φ和ψ都是单位圆盘到单位圆盘的旋转映射.     

对数(α,β)-Bloch空间的新刻画

讨论了单位圆盘上对数(α,β)-Bloch空间的积分性质,得到了该空间的五个等价刻画.并对小对数(α,β)-Bloch空间做了类似推广,得到了小对数(α,β)-Bloch空间的五个等价刻画.最后,利用Carleson测度这个重要工具对这两个空间进行了描述,得到了解析函数分别属于这两个空间的充分条件.     

解析函数空间上的紧Hankel算子

若Hu是单位圆盘的加权Bergman空间上Hankel算子,Hu为紧算子的充要条件是当z趋于单位圆盘边界时,Hu作用在正规化再生核上按范数收敛到0;若Hφ是单位圆盘的加权Dirichlet空间上Hankel算子,也为紧算子的充要条件是Z趋于单位圆盘边界时,Hφ作用在正规化类再生核上按范数收敛到0．     

调和Bergman空间上特殊符号的Toeplitz算子

讨论了单位圆盘上调和函数组成Bergman空间,即调和Bergman空间上符号为径向函数(即只与自变量模相关的函数)的Toeplitz算子。得到Toeplitz算子的有界性与符号函数相关数列有界性等价,紧性与这个数列收敛到0等价。并用这个数列表出了Toeplitz算子的点谱和谱。     

加权解析函数空间上Toeplitz算子

文章由两部分构成。第一部分主要研究了复平面■上向量值Doubling Fock空间F_φ~2上以■-值正算子值函数G (z)为符号的Teoplitz算子,其中φ为次调和函数,且dν=ΔφdA为非零加倍测度,■,通过得到的满足Carleson条件以及消失Carleson条件的几个等价刻画,并且利用Carleson条件刻画了具有■-值正算子值函数符号G (z)的Toeplitz算子的有界性与紧性的几个等价条件。第二部分研究了单位圆盘■上正规权Bergman空间A_β~2上符号在L~∞上的Toeplitz算子的本性范数,算子A的本性范数表示为■,其中■是A_β~2上的紧算子空间,β为正规权,用■表示,Hilbert空间A_β~2是L_β~2的闭子空间,利用Toeplitz算子与紧算子集的距离以及本性范数的定义,得到了非紧Toeplitz算子本性范数的逼近公式。     

友矩阵的可约性及其酉等价性质

研究了友矩阵的一些酉等价性质,得到了友矩阵可约性的一些条件,证明了友矩阵的数值域是一个以原点为中心的圆盘的充分必要条件是该矩阵等于幂零约当块.     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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