广义C0半群的性质与生成定理

引进广义C0半群及其C生成元的概念,得到广义C0半群的一些性质和生成定理.推广C0半群的结论,为直接用于讨论初值问题(d)/(dt)(Cx(t))=Ax(t)Cx(0)=Cy奠定了基础.     

一类广义抽象柯西问题的适定性

为研究广义抽象柯西问题ddtCx(t) =Ax(t)Cx(0 ) =Cy,引进广义C0 半群及其C生成元概念。利用广义C0 半群的一些性质证明了广义抽象柯西问题的适定性的充要条件     

广义C0半群的谱映射定理

传统的C0半群在诸如广义动态经济系统,电 网系统及时滞微分方程等形如d/dt(Cx(t)=Ax(t) Bu(t)其中C不可逆）中得不到直接应用,为此引入广义C0半群来研究初值问题{d/dt(Cx(t))=Ax(t),Cx(O)=Cy,为了讨论其解的稳定性（也即广义C0半群的稳定性）,引入广义C0半群的C生成元A的C谱,用Banach代数中的谱理论方法得到了广义C0半群在此广义谱下的谱映射定理。     

广义Co半群的性质与生成定理

引进广义Co半群及其C生成元的概念，得到广义Co半群的一些性质和生成定理，推广Co半群的结论，为直接用于讨论初值问题{d/dt(Cx(t))=Ax(t)Cx(o)=Cy奠定了基础。     

广义C0半群与耗散算子

利用了广义C0半群的定义、生成元的概念、性质、C0半群所具有的耗散算子的结论,主要得到了广义C0半群与生成元之间的关系,线性算子的耗散性刻画了广义C0半群以及压缩的广义C0生成元的充要条件,进而得到耗散的线性算子与广义C0半群的生成元之间的关系,耗散算子与共轭之间的关系,给出了耗散算子的一些性质。Banach空间中耗散算子是一类应用背景极强的算子,该工作对研究Banach空间下的无穷维动力系统的长期行为意义极大。将C0半群中的耗散算子的性质广泛推广到了广义C0半群,极大的丰富了广义C0半群的内容。     

(C0)类等度连续半群的无穷小生成元的特征

主要讨论在局部凸线性拓扑空间上的(C0)类等度连续半群{T(t):t≥0}诱导的C0-半群拓扑意义下,{T(t):t≥0}的一些基本性质,以及(C0)类等度连续半群{T(t):t≥0}在C0-半群拓扑意义下以及原拓扑意义下的无穷小生成元之间的关系.     

广义C0算子群

在Banach空间上研究单参数有界线性算子族--广义C0算子群,文中给出了广义C0半群及它的生成元定义,进而类似于C0算子群,给出了广义C0算子群的概念,并讨论了它与广义C0半群之间的关系.     

n阶α次积分C半群的逼近

借助算子半群逼近的相关理论及经典算子理论的研究方法,对算子A,An分别次生成的n阶α次积分C半群{T(t)}t≥0和{Tn(t)}t≥0,在一定条件下,当Tn(t)x逼近于T(t)x,则有Rc(λ,An)x逼近于Rc(λ,A)x,反之也成立.从而丰富了n阶α次积分C半群的研究内容.     

广义C-半群的生成元和性质

C-半群是有界线性算子强连续半群的一个有意义的推广,这一概念最早是由Davies与Pang引入的。后来,R.delaubenfels对其中生成元的定义作了改进。高文华为解决广义动态经济问题提出了广义C0-半群的定义,王宗毅对其进行了进一步研究,刘嫚提出了广义C-半群的定义。文章在此基础上给出了广义C-半群生成元及其弱生成元的定义,并且对其生成元的强弱性进行了研究,证明了其生成元的强弱等价性。另外,王宗毅在传统C0-半群的基础上,给出了广义C0-半群的定义,并且研究了它的一些性质,得到了一些有意义的结果,文章在此基础上进一步探讨了广义C-半群生成元的若干性质。     

可微C0-半群的谱

利用可微C0-半群的若干性质给出了可微C0-半群{T(t):t≥0}的生成元A的谱与AT(t)的谱之间的关系.     

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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