多项式代数与半群代数中单项式序之间的关系

研究了半群代数k[A]中单项式序的性质,利用环面同态讨论了多项式代数k[x]和k[z]中的单项式序与半群代数k[A]单项式序的关系,给出了相互诱导的条件及N0A上全序是良序的充分必要条件.     

可解多项式代数上的泛左Grbner基

设I是可解多项式代数A=K[a_1,…,a_n]的一个非零左理想,由可解多项式代数上的左Grbner基性质,可知A中任何一个左理想对于一个单项式序的左Grbner基不一定满足另一个单项式序.首先证明了在B上的任意2个单项式序1,2下,g={g1,g2,…,gt}是I在1下的左Grbner基,若LM1(gi)=LM2(gi),1≤i≤t,那么g={g1,g2,…,gt}也是I在2下的左Grbner基;其次证明了I在A上的所有单项式序(可能无限个)下只有有限个约化左Grbner基;最后证明了A中的一个子集F,对于其上的任何一个单项式序,都是I的左Grbner基,子集F就是A的泛左Grbner基.     

有关Leibniz流形若干性质的讨论

本文给出了Leibniz流形上Leibniz括号的一些性质,并讨论了微分同胚对Leibniz流形结构的保持,同时得到了微分同胚所诱导的Leibniz括号的若干性质。     

广义几何Lie代数及其研究

为了探究Lie代数的一般拓展意义,构造了一般广义几何Lie括号与广义几何Lie代数,使得Lie代数是其一种特殊情况;然后讨论了它们的相关性质,证明了流形上向量场在广义几何Lie括号下的微分同胚,改进了Lie括号给出的结果.     

关于微分单项式的值分布

对一般的微分单项式的分布进行了研究，主要结果是：对于f为非常数亚纯函数及其微分单项式。     

多项式代数上的微分理想

设k[x]是特征为零的域k上的一元多项式环.研究了k[x]上带权的非零单项式微分算子对应的微分理想的性质,利用矩阵求最大公因式的方法,确定了由一个多项式生成的微分理想作为通常意义上的理想时的生成元.     

有关Poisson流形相关性质的讨论

文章给出了有关Poisson括号的一些性质,并利用Casimir函数对Poisson流形上的Poisson结构的性质进行了考察     

单位球上多重调和Bergman空间上的k-拟齐次Toeplitz算子（英文）

本文研究单位球上的多重调和Bergman空间b_a~2上的k-拟齐次Toeplitz算子的基本性质,得到了该类算子所构成的交换子及半交换子的两个对称性质.此外,本文还得到了b_a~2上的两个单项式型Toeplitz算子所构成的交换子和半交换子具有有限秩的充分必要条件.     

单边单项式序下的FS-基

设K是一个域, R是具有SM-基B的一个K-代数, 且是B上一个单边(即左或右)单项式序。 那么,关于交换多项式代数和非交换自由代数的商代数的子代数在双边单项式序下经典的FS-基理论可完整地推广到R的任一商代数R／I的子代数上。特别地, 对于一类N-分次代数R／I,给出计算有限n-截断FS-基的有效算法, 从而阐明了在单边单项式序下构造FS-基的可行性。     

单位球上多重调和Bergman空间上的k-拟齐次Toeplitz算子

本文研究了单位球上多重调和 Bergman 空间上 k-拟齐次 Toeplitz 算子的基本性质,得到了其上两个该类算子所构成的交换子和半交换子的对称性质. 此外, 本文还得到了其上两个单项式形 Toeplitz 算子构成的交换子和半交换子有有限秩的充分必要条件.     

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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