一类具有Michaelis-Menten响应函数的三种群捕食模型的定性分析

考虑了具有Michaelis-Menten响应函数(或HollingⅡ型)的三种群简单食物链,给出了解的耗散性和持续性,并且利用带ε的Young不等式和Poincaré不等式对扩散项进行了讨论,给出了在扩散系数足够大的情况下非常数正解的不存在性.     

完全不连通空间的若干性质

给出完全不连通空间的若干等价条件,讨论了完全不连通空间与S-完全不连通空间的关系,以及完全不连通空间传递性和可积性,并给出几个完全不连通空间成立的条件.     

Godel不完备性定理的非形式化论述

研究了对现代数理逻辑与形式系统公理化方法有着深远影响及重大意义的Godel不完备性定理 1和定理 2 ,给出了 Godel不完备性定理证明的一种非形式化论述 .非形式化地阐述了 Godel不完备性定理证明的基本思想 ,论述了 Godel不完备性定理证明在方法论上的特色及其深远影响     

关于二次反馈控制双线性系统的极限环

本文研究由二次反馈控制的双线性系统，给出了极限环存在性和不存在性定理。     

一类二次系统的全局结构

目的讨论一类二次系统极限环的惟一性及给出全局结构图。方法运用Lienard方程组理论及环域定理对此类二次系统极限环的惟一性进行讨论,并运用分支理论讨论异宿环的稳定性。结果得到了此类系统极限环的存在惟一性及不存在性和异宿环稳定及不稳定的完整结果。结论得到了一类二次系统极限环的惟一性,给出了参数取值不同时的7种全局结构图。     

关于Heisenberg群上的Sobolev不等式与等周不等式的等价性

研究了Heisenberg群上Gagliardo-Nirenberg-Sobolev不等式与等周不等式的等价性,给出了等价性证明.     

不确定系统约束条件下的控制问题

讨论了线性不确定系统在控制能量受限下的能控性问题,给出了判定不确定系统完全能控的充分条件,证明了线性不确定系统控制能量受限下的能控性的几个判据,对控制能量受限下状态不能控也给出了一个判据。     

各向异性压电弹性力学问题的通解

给出了一般各向异性压电弹性力学问题的通解,并证明了其完备性和不唯一性。     

不确定非线性系统的鲁棒耗散性控制

从能量耗散的角度,研究了不确定非线性系统的耗散性控制问题,给出了全新的供给率,其特殊情形可以为H∞控制和无源控制.给出了耗散性的条件,并将无源KYP引理推广到耗散性系统中,最后设计了状态反馈控制器使系统耗散.     

不确定随机事件机会测度的弱可数次可加性及其应用

主要讨论不确定随机事件机会测度的一些性质.证明了其具有弱可数次可加性、零可加性、双零渐近可加性和连续性,并给出了不确定随机变量序列的几个收敛概念和收敛定理.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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