一类平面Hamilton系统的同宿轨与周期轨的连续依赖性

讨论了一类平面Hamilton系统的自治扰动．证明了在一定的条件下该系统的同宿轨与周期轨的存在性，进而证明了它们对小扰动函数的连续依赖性．     

一类5次系统高次奇点的中心焦点判定

对一类具高次奇点O（0，0）的实平面5次微分自治系统，计算出原点的前9个焦点量公式；同时，给出了一类5次系统的前7个赤道环量．     

带四个时滞的平面系统的周期解

文章利用重舍度原理研究带四个时滞的平面非自治系统的周期解问题，得到了其存在2π-周期解的充分性条件．     

定性理论中的奇点分类及其拓扑等价性

对于平面自治系统，本文从线性系统入手分析其轨线在相平面上的性态，研究其奇点邻域内的轨线分布，根据分布的不同情况归纳出九种不同类型的奇点，并且在此基础上讨论一般自治系统与其相应的标准系统之间在齐次线性变换下的拓扑等价性。     

平面自治微分系统复合型积分因子的存在定理及应用

提出了平面自治微分系统复合型积分因子的新定义,给出了几类平面自治系统复合型积分因子的新存在定理和计算公式,所得结果涵盖并推广了相关文献的结论.     

一类平面三次系统存在周期解的充分条件

本文讨论一类平面三次系统存在周期解的充分条件,分别对自治和非自治系统给出了两个定理。     

平面自治系统极限环的存在性及解的有界性

本文利用一些新的技巧建立了保证平面自治系统存在极限环及解有界的几组充分条件,并举例说明了本文的结果对某些平面自治系统极限环存在性的确定及解的有界性的判断是十分有效的.     

关于自治系统极限集的几个结论

给出了自治系统的Ω极限集与A极限集相等的充分条件,并且针对平面自治系统,进一步给出了Ω极限集与A极限集相等的充要条件.     

一类高次多项式系统极限环的研究及其应用

应用平面自治系统的极限环理论和分支理论，研究了一类具有普遍意义的高次多项式系统。讨论了该系统极限环的存在性和惟一性，分析了系统的分支，同时解决了系统极限环的个数和分布问题。     

相平面上自治系统特征的拓扑涵义

从拓扑的角度阐述了平面自治系统在其相平面上的重要特征及涵义,从而达到对于微分动力系统定性分析的目的。     

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.     

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