非自治反应扩散方程的近似惯性流形

研究具有耗散性质的非自治反应扩散方程u t=νΔu -f( u,t) ψ( x,t) ,运用具有两个参数的算子簇—“过程”来描述此无穷维动力系统,构建了其近似惯性流形,进一步获得此近似惯性流形逼近方程一致吸引子的阶数的近似估计.     

非自治Schr dinger方程的近似惯性流形

研究具有耗散性质的非自治Schr dinger方程ut-(λ iα)Δu ( k iβ) | u|2u -γu =f(t ,x) ,运用具有两个参数的算子簇———“过程”来描述此无穷维动力系统,构建了其近似惯性流形,进一步获得此近似惯性流形逼近方程一致吸引子的阶数的近似估计.     

非自治Schroedinger方程的近似惯性流形

研究具有耗散性质的非自治Schroedinger方程δu/δt-（λ＋iα）Δu＋（k＋iβ）｜u｜^2-γu=f（t,x）运用具有两个参数的算子簇——“过程”来描述此无穷维动力系统，构建了其近似惯性流形，进一步获得此近似惯性流形逼近方程一致吸引子的阶数的近似估计。     

非自治Schr(o)dinger方程的近似惯性流形

研究具有耗散性质的非自治Schr(o)dinger方程((Э)u(Э)t)-(λ+iα)Δu+(k+iβ)|u|2u-γu=f(t,x),运用具有两个参数的算子簇--"过程"来描述此无穷维动力系统,构建了其近似惯性流形,进一步获得此近似惯性流形逼近方程一致吸引子的阶数的近似估计.     

非线性Schrdinger方程的近似惯性流

考虑了具有耗散项的非线性Schr dinger方程i ε t+ 2ε x2+g(｜ε｜2)ε+iαε+h=0,构建了它的两个非线性近似惯性流形.进一步得到了这两个近似惯性流形逼近方程全局吸引子的阶数估计.     

mKdV-Burgers方程长期动力学行为的数值分析

研究一类称之为mKdV-Burgers方程的非线性演化方程．为了得到这一方程的长期动力学行为，利用惯性流形和近似惯性流形理论，在已经证明这一类方程的近似惯性流形存在的基础上，给出低模态下周期边界条件的mKdV-Burgers方程近似惯性流形的约化形式，并在三模态下作数值分析，给出数值模拟的结果．     

KS方程近似惯性流形的精确线性化控制

利用李群研究Kuramoto Sivashinsky方程近似惯性流形下的精确线性化控制 近似惯性流形能非常好地刻划KS方程的动力学性质 ,包括吸引子及混沌行为 对KS方程笔者引入它的近似惯性流形 ,并等价地研究近似惯性流形所表示的ODE ,对此ODE借助李群这一重要工具进行精确线性化 ,并由线性系统设计的反馈控制得到ODE的控制律 利用这个控制律及修正后的控制律对上述ODE进行控制 数值模拟的结果表明 :近似惯性流形确实能很好地刻划KS方程的动力学行为 ;精确线性化控制的效果直接、有效     

非线性Schroedinger方程的近似惯性流

考虑了具有耗散项的非线性Schroedinger方程iaε/at a^2ε/ax^2 g(|ε|^2)ε iaε h=0，构建了它的两个非线性近似惯性流形，进一步得到了这两个近似惯性流形逼近方程全局吸引子的阶数估计。     

铁磁链方程的近似惯性流形

讨论了铁磁链方程解的长时间行为,通过压缩映象原理,构造了该方程的几类近似惯性流形,并证明了近似惯性流形在长时间后高阶逼近方程的整体吸引子.     

具有快速增长非线性项的Cahn-Hilliard方程的近似惯性流形

讨论了具有快速增长非线性项的Cahn-Hilliard方程ut г△^2u-△G(u)=0,G(u)=△↓^uφ(u),△↓^xun|x∈ЭΩ=△↓x(△u)n|x∈ЭΩ=0,u(0,x)=u0(x)解的长时间行为，构造了一个新系统，利用压缩映象原理，得到了该系统解的存在唯一性和一个m维光滑流形，即近似惯性流形，证明了Gahn-Hilliard方程的任意轨道在长时间后时入该流形的一个很小的领域中。     

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.     

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