KdV—Burgers方程行波解的研究

用Ｌａｘ－Ｎｉｏｕｖｅｒ变换求得了ＫｄＶ－Ｂｕｒｇｅｒｓ方程在特定情形下的精确行波解、渐近行波解,用Ａｄｏｍｉａｎ积分法求得了级数解。此外,找到了ＫｄＶ－Ｂｕｒｇｅｒｓ方程行波解与ＲＬＷ－Ｂｕｒｇｅｒｓ方程行波解之间的关系,进一步分析了ＫｄＶ－Ｂｕｒｇｅｒｓ方程一类已知的解析解。     

KdV—mKdV—Burgers方程和KPP方程的精确行波解

利用一种直接的代数方法,求出了组合ＫｄＶ－ｍＫｄＶ－Ｂｕｒｇｅｒｓ方程和Ｋｏｌｍｏｇｏｒｏｖ－Ｐｅｔｒｏｖｓｋｉ－Ｐｉｓｋｕｎｏｖ方程的几类行波解,其方法也可推广求解高维非线性演化方程．     

KdV—Burgers—Kuramoto方程的行波解

在对ＫｄＶ－Ｂｕｒｇｅｒｓ－Ｋｕｒａｍｏｔｏ方程定性分析的基础上,求得了显式行波解,就是ＫｄＶ－Ｂｕｒｇｅｒｓ－Ｋｕｒａｍｏｔｏ方程的一类异宿和同宿轨道。它将有利于更好地建立湍流模型和分析三维相空间中的Ｓｉｌｎｉｋｏｖ同宿轨道。     

齐次平衡法与Burgers—KdV方程的精确解

对齐次平衡法进行适当修改，求得了Ｂｕｒｇｅｒｓ－ＫｄＶ方程的２个精确解。     

满足β模式的间隙湍流的奇异值,能谱指数与分数维…

本根据ＫｄＶ－Ｂｕｒｇｅｒｓ方程和分形理论，研究了满足β模式的湍流的奇异值、能谱指数与分维和波数比的关系。     

受迫广义KdV－Burgers方程的周期行波解

讨论了一维广义ＫｄＶ－Ｂｕｒｇｅｒｓ方程的周期行波解，给出了解的有界性及估计式，进而讨论了解的存在性和唯一性。     

受揎广义KdV—Burgers方程的周期行波解

讨论了一 维广义ＫｄＶ－Ｂｕｒｇｅｒｓ方程的周期行波解，给出了解的有界性及估计式，进而讨论了解的存在性和唯一性。     

一类非线性方程的精确解

本文首次讨论了ＫｄＶ方程的守恒律问题，并在Ｖｉｒａｓｏｒｏ群的余伴随轨道ＤｉｆｆＳ＾１空间中找到一类非线性方程的精确解，例如ＫｄＶ系列，Ｂｕｒｇｅｒｓ系列方程等。     

齐次平衡原则与BTs

用齐次平衡原则导出了Ｔｈｏｍａｓ方程、Ｂｕｒｇｅｒｓ方程、ＫｄＶ方程和Ｂｏｕｓｓｉｎｅｓｑ方程的新型ＢＴ。它们的著名非线性变换,可作为这里导出的新型ＢＴ的特殊情形。     

KDV-Burgers方程的拟特征线方法求解

ＫＤＶ－Ｂｕｒｇｅｒｓ方程可作为具有粘性耗散效应的非线性水波问题的控制方程，也是描述许多流体物理问题的简化方程．本文采用拟特征线方法对ＫＤＶ－Ｂｕｒｇｅｒｓ方程进行了数值求解，研究了在不同耗散效应和色散效应时数值解的特性，发现与理论分析结果吻合良好．     

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