关于Hom-Leibniz代数胚表示

Hom-Lie代数胚是李代数胚的一种自然推广,它的截面空间构成一个Hom-Lie代数,锚映射不再是截面空间同态.基于Hom-Lie代数胚概念定义了Hom-Leibniz代数胚,可以看作是非对称版本的Hom-Lie代数胚,即当截面空间的Hom-Jacobi代数反对称时,它就变为Hom-Lie代数胚.借鉴Leibniz代数的表示,定义了Hom-Leibniz代数胚的在向量丛上的表示.借助于直和空间投射,通过分析Hom-Leibniz代数胚Matched pair,构建了一对Hom-Leibniz代数胚的表示,并分析了它们的相容性条件.由于Hom-Lie代数胚是Hom-Leibniz代数胚的特殊情形,类似定义了Hom-Lie代数胚的表示及Matched pair,并获得了相应结果.     

一类无穷维李代数的自同构群

令W表示秩为1的Witt代数,是定义在除去2个固定点为正则的Riemann球面上的半纯向量场李代数,也是一个圈上多项式向量场李代数的复化及罗朗多项式环的导子李代数,在数学和物理学的很多领域中有着重要应用.设V是一个向量空间,由某种作用将其看作W-模.设G是Witt代数W由模V得到的分裂扩张.主要研究了分裂扩张G的结构,并给出了G的自同构群,所得结果丰富了李理论的内容.     

群在向量空间上的广义作用

设G为群,GL(V)是向量空间V的全体可逆线性变换组成的乘法群,群G到GL(V)的一个广义同态φ称为G的一个广义线性表示,这实质是群G在向量空间V上的广义作用.该文通过研究群在向量空间上的广义作用,得到了与群G结构相关的几个重要结果.     

基于几何代数的彩色图像相似度量与边缘提取

面向彩色图像边缘提取问题,引入具有多维统一表达特征的几何代数理论,利用几何基编码实现了对彩色图像颜色空间和特征空间的集成表达与相互映射;利用几何代数空间中颜色空间和特征空间的整合表达,构建了图像的特征描述和相应的运算算子;根据饱和度相对光源亮度值的不变特性,基于饱和度算子实现了彩色图像的颜色特征描述;设计了基于反射算子和几何积的颜色向量相似性度量算子;利用Clifford卷积实现了融合亮度信息与饱和度信息的彩色图像边缘提取.本文提出的彩色图像边缘提取算法可兼容标量模板和向量模板,并可支撑基于阈值的边缘提取特征约束.案例研究表明,论文的边缘提取方法在提取边缘结果的结构保持性和信息完整性上都具有较为明显的优势.     

偏序向量空间中正投影算子的一类扩张定理

该向量空间E是一个Dedekind完备偏序向量空间,G是E的一个控制子空间,而算子P0是定义在G上的一个正投影算子,则P0能扩张成整个E上的正投影算子,从而在较一般的偏序向量空间上,得到了正投影算子的一类扩张定理,其结果进一步推广了算子的扩张性质.     

有关超群表示的一些性质

定义超群G在超空间V上的一个超线性表示,并将其线性扩充到群代数C[G]上,从而构造出一个C[G]-超模结构;并给出超空间V上的内积〈,〉运算,讨论该内积关于G作用下不变时所具有的性质;同时推广了马施克定理及舒尔引理。     

Guichardet-Fock空间上的s-适应算子

讨论定义在Guichardet-Fock空间上的s-适应算子的相关性质,并给出s-适应算子在向量空间V上s-适应扩张.     

仿射李代数的Sl(n,C)顶点算子表示V_Q上的顶点代数结构(英文)

利用李代数表示论研究了仿射李代数Sl(n,C)的顶点算子表示VQ上的顶点代数结构,并利用形式幂级数的计算方法证明VQ是一个顶点代数,然后给出了它上面的保角向量.     

有限秩算子及n-自反性

主要工作：（１）设Ｓ是向量空间Ｖ上的有限维线性算子空间，ＳＦ表示Ｓ中全体有限秩算子，则Ｓ是ｎ＿代数自反的等价于ＳＦ是ｎ＿代数自反的；（２）Ｓ是Ｂａｎａｃｈ空间Ｘ上的连续线性算子空间，当Ｓ满足一定条件时，Ｓ是ｎ＿拓扑代数自反的等价于ＳＦ是ｎ＿拓扑代数自反的     

有限秩序子及n—自反性

主要工作：（１）设Ｓ是向量空间Ｖ上的有限维线性算子空间，ＳＦ表示Ｓ中全体有限秩序算子，则Ｓ是ｎ－代数自反的等价于ＳＦ是ｎ－代数自反的；（２）Ｓ是Ｂａｎｃｈ空间Ｘ上的连续线性算子空间，当Ｓ满足一定条件时，Ｓ是ｎ－拓扑代数自反的等价于ＳＦ是ｎ－拓扑代数自反的。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has