一个新超混沌系统

为产生复杂的超混沌吸引子,基于一个3维混沌系统构造了一个新的4维超混沌系统,用非线性动力学分析方法研究了该系统吸引子的相图、时间响应、功率谱、系统的分岔图、Lyapunov指数谱图和Lyapunov维数等.分析结果表明,新的4维系统当参数满足一定条件时,具有2个正的Lyapunov指数,是一个新超混沌系统,随着新引入的参数变化呈现周期、复杂周期、拟周期、混沌及超混沌等复杂的动力学行为.     

一个新四维超混沌系统的构建与电路实现

利用基本Sprott-B系统仅具有两个涡卷平衡点的特点,通过系统改造与推广,提出一个具有3个平衡点的三维混沌系统,进而通过增加一维线性控制器并反馈至三维系统状态方程,构建出一个新四维超混沌系统.采用相轨图、Lyapunov指数谱和分岔图等动力学工具对超混沌系统进行了仿真分析.结果表明,当参数变化时,系统可以在周期或复杂周期、混沌与超混沌之间演变,存在复杂而奇异的动力学行为.研制电子电路并生成了超混沌吸引子,完成了实验验证.     

月亮朔望月周期在气候变化中的响应——一些动力学探讨及统计研究

从非线性理论的观点出发，对月亮运动能否产生气候响应这一问题进行了初步的探讨．发现在一个振幅与月亮运动所能引起的量级相当的半月周期外强迫作用下，会使非线性准静止超长波系统产生锁频行为，锁频的条件与地形参数等因子有关．这一结果表明，月亮运动对大气系统的周期强迫，其量级虽然较小，但在地球上适当地区也可能会产生重要的气候响应．另外，分析了华南地区若干测站的温度序列，发现它们的变化与月亮塑望周期系有显著的相关．因此，对某些地区的气候变化而言，月亮运动可能是一个非常重要的外部因子     

一个新超混沌系统及其线性反馈同步

构造了一个新的四维超混沌系统,用数值模拟方法研究了该系统的相图、分岔图、Lyapunov指数谱等动力学行为.分析结果表明新系统随新引入的参数变化时呈现周期、拟周期和超混沌动力学行为,而且超混沌的参数范围较大.基于Lyapunov稳定性定理,设计了一种线性牵制控制器实现了该超混沌系统的混沌同步,结果表明该方法正确有效.     

食饵具有存放周期性制约的捕食者-食饵系统模型及其动态行为的数值模拟研究

基于对自然界捕食系统实际情况的分析出发。对模型进行了扩展，并建立了受时变环境周期激励、食饵具有常数存放率以及食饵具有周期存放等情况下的捕食者--食饵系统的新模型，通过模拟计算相平面轨线(迹)、时程图、极限集状态、截面、功率谱等若干系统指标，分析研究了几个新捕食模型随参数变化时表现出的动态行为以及行为所发生的质的变化．结果表明周期激励强度、食饵常数存放率的大小、食饵周期存放以及周期存放的频度对系统行为都有很大的影响，当食饵存放率为零时，系统随周期激励强度的增大经历了稳定、周期波动、准周期波动和灭绝四种状态；当周期激励强度和频度恒定时，系统随食饵常数存放率的增大经历了周期(准周期)波动、分岔后的周期(准周期)波动和灭绝等状态；而在周期激励强度和频度恒定时，食饵周期存放可能引起系统出现混沌行为；当周期存放的强度较大时，食饵存放频度的变小不利于系统的稳定．     

一个新混沌吸引子及其控制

在Lv系统的基础上,构造了一个新的三维自治混沌系统.通过理论分析和相轨迹图、分岔图和Lyapunov指数谱等非线性动力学分析方法研究了系统的丰富的非线性动力学行为.结果表明：系统是耗散的;系统存在5个平衡点,因而与Lv系统是非拓扑等价的;系统的轨线是有界的;当参数满足一定条件时,系统是混沌的.最后用正弦函数加到系统的某个方程上,混沌行为被控制到稳定的周期轨道.数值仿真结果说明了该方法的有效性和可行性.     

一个新的四维超混沌系统及其电路仿真

为产生复杂的超混沌吸引子,基于一个三维混沌系统构造了一个新的四维超混沌系统.分析了该系统平衡点的稳定性、吸引子的相图、系统的分岔图和Lyapunov指数谱等基本动力学特性.结果表明,新的四维超混沌系统随着新引入的参数变化呈现周期、混沌及超混沌动力学行为.最后设计了一个模拟电路,通过实验结果进一步验证了与数值仿真的一致性.     

四维超混沌LC振子的同步研究

采用误差变量的线性组合对超混沌系统进行单向反馈控制，解析地证明了实现同步的可能性，从Lyapunov理论角度分析了对四维超混沌LC振子采用单变量单向耦合的可行性，求出同步所需控制器要满足的条件，当驱动系统参数做周期变化时，应用文中的控制器很好地实现了两个超混沌系统的同步．     

月亮朔望月周期在气候变化中的响应：一些动力学探讨及统计…

从非线性理论的观点出发，对月亮运动有否产生气候响应这一问题进行了初步的探讨。发现在一个振幅与月亮运动所能引起的量级相当的半月周期外强迫下，会使非线性准静止越长波系统产生锁频行为，锁频的条件与地形参数等因子有关。     

Paul势阱中两带电粒子的暂态混沌

从耦合ＭａｔｈｉｅｕＣｏｕｌｏｍｂ方程出发,用数值方法研究了Ｐａｕｌ势阱中两个带电粒子的暂态行为,发现平均暂态寿命随势阱电压的增加而指数增加,或随阻尼系数的增加而指数减小．在这个耗散系统中不存在永久混沌,暂态混沌是吸引子出现之前系统普遍存在的行为     

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