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.     

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.     

一种具有共存吸引子的超混沌系统的动力学分析

提出了一个具有共存吸引子的新五维超混沌系统,系统无平衡点,因此具有隐藏吸引子.通过Lyapunov指数谱、分岔图、相轨迹图、Poincaré截面、参数盘等动力学分析,系统呈现出从周期、倍周期到混沌、超混沌的动力学行为,同时系统具有对称不变性.在参数不变仅改变初值的情况下,系统出现周期与超混沌吸引子共存、周期与混沌吸引子共存.该系统可以引入两个偏置,使吸引子能同时在两个方向上平移.通过参数盘的分析可见,在平移过程中吸引子类型发生了改变,而且具有超混沌与周期吸引子共存特性.改变初值和偏置两种情况均产生共存吸引子,进一步体现出该系统具有复杂的动力学特性.     

一个新四维光滑四翼超混沌系统及电路实现

利用非线性状态反馈控制法,提出了一个新的具有较大正Lyapunov指数的四维光滑自治超混沌系统。该系统具有大范围的四翼超混沌区域。讨论了系统平衡点的稳定性。通过Lyapunov指数、分岔图及Poincaré截面分析了系统的动力学行为,并用相图展示了四翼混沌吸引子和几种不同形状的四翼超混沌吸引子。随着参数的不同,该系统还可以历经拟周期和周期状态。最后给出了典型超混沌吸引子的电路实现。     

一个大Lyapunov指数四维超混沌系统分析及同步

在一个三维混沌系统的基础上构造了一个有大Lyapunov指数的四维超混沌系统,分析了该系统的耗散性和平衡点的稳定性。在所有系统参数中,改变某个参数而固定其余参数,依次计算和分析了系统各个参数的变化对系统Lyapunov指数谱的影响,从Lyapunov指数谱随各参数的变化判断系统作混沌运动和超混沌运动的参数变化区间。然后用相图研究了系统随系统参数变化时的运动规律。最后设计了一种线性反馈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。该系统在混沌和超混沌运动参数区间表现出的混沌和超混沌特性可以给基于混沌和超混沌理论的工程应用提供更多选择。所得结果为该超混沌系统在混沌保密通信中的应用提供了理论参考。     

一种新六维超混沌系统及其电路实现

通过Duffing混沌系统和lorenz混沌系统的结合,产生了一个新的结构复杂、多参数的六维超混沌系统,对系统中7个参数的Lyapunov指数仿真实验显示此超混沌系统具有强混沌特征。分析了该新超混沌系统的相空间结构图、Lyapunov指数图、Poincare映射、功率谱以及时域等特性,设计了该新混沌系统的电路实现和仿真实验,理论分析和实验结果证实了该系统属于一种新的超混沌系统。     

三维类Lorenz混沌系统的变形与超混沌实现

在三维类Lorenz混沌系统的基础上增加一维状态和两个参数,构建了一个新的四维超混沌系统。利用非线性动力学分析方法简要分析了该系统平衡点的稳定性、超混沌吸引子的相图、分岔图、Lyapunov指数谱和Lyapunov维数等基本动力学特性。结果发现新的四维系统随着新引入的两个参数(p和m,pu为非线性控制器,u的变化率u=mx)变化分别呈现周期、拟周期、混沌及超沌混动力学行为,动力学行为相同,但随m的变化范围较大。     

六阶耦合chua电路超混沌控制研究

给出了六阶耦合Chua电路的模型,并Lyapunov指数图分析了该系统的超混沌行为。利用了两种方法实现了系统的混沌控制,将系统的超混沌行为有效地控制到稳定的周期轨道或不动点。     

一个新的超混沌系统

构造了一个新的四维超混沌系统,用数值模拟的方法研究了该系统的超混沌吸引子的相图、系统的分岔图、Lyapunov指数谱图和Lyapunov维数等.分析结果表明,新的四维系统当参数满足一定条件时,具有两个正的Lyapunov指数,是一个超混沌系统,随着新引入的参数变化呈现出丰富的动力学行为.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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