稀疏效应捕食-被捕食系统的持久性和周期轨道

考虑一类稀疏效应非自治Ｖｏｌｔｅｒｒａ捕食系统，证明了该系统在某些条件下是持久的，而且，若该系统是周期系统，在某些条件下，它们存在唯一的严格正周期轨道，且是全局渐近稳定的。     

一类具Beddington型功能性反应的非自治捕食系统的渐近性质

讨论一类具有Beddington型功能性反应的捕食者——食饵非自治系统,证明在适当的条件下，系统是持续生存的；若系统是周期系统，则在适当的条件下，该系统存在唯一全局渐近稳定的正周期解。     

食饵种群为Logistic模型的捕食者-食系统的持久性

考虑食饵为比Logistic模型的捕食者—食非自治系统，证明了该系统在某些条件下是持久的。而且，若该系统是周期系统，在某些条件下，它们存在正周期解又是全局渐近稳定的。     

关于核磁共振系统两类A—A相的计算

从求解核磁共振系统Schroedinger方程的一般解出发，得到核磁共振系统产生A－A相的cyclic条件和循环初态条件。cyclic条件要求系统的频率只能取离散的序列而初态可以是任意的；循环初态条件要求对系统的初态作一定的限定而系统的频率可以是任意的。在此基础上计算出系统在满足cyclic条件和循环初态条件时产生的A－A相，在cyclic条件下，系统产生的A－A相是依赖于初态和大于1的自然数的离散序列；在循环初态的条件下，系统产生的A－A相仅依赖于频率。证明了在绝热极限下，从这两类A－A相可以严格获得Berry几何相。     

非自治捕食—食饵扩散系统的渐近性质

讨论了一个非自人有第Ⅱ类功能性反应九的两种群捕食－食饵系统，一个种群可以在两个斑块间扩散，另一种群限制在一个斑块上，证明了在适当条件下，系统是永久持续生存的；若系统是周期系统，则在适当条件下，该系统存在惟一的全局吸引的正周期解。     

一类捕食与被捕食系统的持续生存性与周期解

讨论了一类一个捕食者种群和两个食饵种群构成的非自治生态系统．系统中食饵种群有各自的避难所，它们在避难所内外可以迁移．应用常微分方程定性和稳定性的方法，得到了在一定条件下系统是持续生存的；进一步，若系统是一个周期系统，则在合适的条件下，系统存在唯一的、全局渐近稳定的周期解     

一类具有状态时滞的时离散多智能体系统可控性研究

本文针对一类舍有状态时滞的双积分器模型的时离散多智能体系统，在两种通信协议条件下，研究了它的可控性问题。我们应用化时滞系统为其等价的无时滞的增广系统的方法，获得了由跟随者构成的系统在多个领航者的控制下，系统可控的一些充分条件。在这些条件下，系统可以完成预期的编队控制或速度控制。     

浅谈高校办公自动化系统建设

办公自动化系统建设是高校工作现代化建设的一项重要内容，是提高高校在高技术教育条件下整体工作能力的有效途径。对高校在高技术条件下如何搞好办公自动化系统建设提出了几点建议。     

一类捕食与被捕食系统的持续生存性与周期解

讨论了一类一个捕食者种群和两个食饵种群构成的非自治生态系统，系统中食饵种群有各自的避难所，它们在避难所内外可以迁移，应用常微分方程定性和稳定的方法，得到了在一定条件下所得持续生存的；进一步，若系统是一个周期系统，则在合适的条件下，系统存在唯一的，全局渐近稳定的周期解。     

周期Lotka-Volterra竞争模型的持续生存性

讨论了周期Lotka—Vo1terra反应扩散竞争系统在齐次Dirichlet边值条件下正周期解的存在性和全局渐近性态，在关于系数的一定条件下证明了该系统是持续生存的．     

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.     

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     

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

正~~