一类具有二阶细焦点的二次系统

对如下一类具有二阶细焦点的二次系统进行了研究， ｄｘ／ｄｔ＝－６＋ａｘ＾２， ｄｙ／ｄｔ＝ｘ＋ｌｘ＾２＋ｍｘｙ＋ｎｙ＾２，其中ｗ１＝－２ａｌ－ｍ（ｌ＋ｎ）＝０，ｗ２＝ａ（２ａ＋ｍ）（３ａ－ｍ０［ｎ（ｌ＋ｎ）＾２－ａ＾２（ａｌ＋ｎ）］≠０。证明了当－１＜ｌ／ｎ≤时，系统（１）在０外围     

二次微分系统(Ⅲ)n=0在二阶细焦点外围极限环的存在唯一性

对于二次微分系统（Ⅲ）n=0,x=-y＋δx＋lx^2＋mxy,y=x（1＋ax-y）可证得如下定理：假设a〈0,0〈a/m〈1/5,l^2＋a^2（2l-1）〉0,若l/a≥2,则系统（1）在二阶细焦点O（0，0）外围恰有唯一的极限环。并得到如下推论：假设a〉0,0〈a/m〈1/5,l^2-a^2（2l-1）〉0，若l/a≤-2,则系统（1）在二阶细焦点O（0，0）外围恰有惟一的极限环。     

两个关于某一二次微分系统的极限环个数的猜想的等价性

Ｊ．Ｗ．Ｗ雷恩教授猜想二次微分系统：ｘ＝－ｙ＋δｘ＋ｌｘ＾２＋ｍｘｙ，ｙ＝ｘ（１＋ｘ）在条件ｌ〉０，ｍ〉２，δ〈０之下最多只能有两个极限环，但无法证明。要本文证明了他的猜想和作者文「２」中的一个猜想是等价的。     

二阶非线性抛物型偏微分方程初边值问题的奇摄动

本文讨论一类二阶非线性抛物型偏微分方程初边值问题的奇摄动解法，设Ｌεｕ＝δｕ／δｔ－〔εΣ↑ｎ↓ｉｊ＝１δｉｊ（ｘ，ｔ）δ＾２ｕ／δｘｉδｘｊ＋Σ↑ｎ↓ｉ＝１ｂｉ（ｘ，ｔ）δｕ／δｘｉ＋Ｃ（ｘ，ｔ，ｕ）〕＝０ ｕ（ｘ，ｔ，ε）│ｔ＝０＝ｕ（ｘ，０，ｔ）＝μ（ｘ，ε），ｘ∈Ｂ↑－ ｕ（ｘ，ｔ，ε）│ｓ＝ｈ（ｘ，ｔ，ε）│ｓ（ｘ，ｔ）∈Ｓ其中ε〉０是小参数，给出了上述问题的解的渐近展开式。利用比较定理     

不含K3图的周长

设Ｇ为不含Ｋ３的２连通的非偶图的图。Ｄ（ｕ）｛ｖ｜ｖ∈Ｖ（Ｇ），ｄ（ｕ，ｖ）＝２｝，δ０＝ｍｉｎ｛ｍａｘ（ｄ（ｕ），ｄ（ｖ）｜ｕ，ｖ∈Ｖ（Ｇ）且ｄ（ｕ，ｖ）＝２｝，Ｄ（δ０）＝｛ｕ｜ｕ∈Ｖ（Ｇ）且ｄ（ｕ）≥δ０｝，δ≥δ０时还满；     

非均匀(Ⅱ)型三角剖分下双周期二次样条空间S21(△mn(2))

设Ω＝「０，ｘｍ」「０，ｙｎ」，Ω的熟知的非均匀（Ⅰ）、（Ⅱ）型三角剖分分别记为△ｍｎ＾（ｉ），ｉ＝１，２，△ｍｎ＾（ｉ）上的分片二次ｋ次Ｃ＾１多项式的全体记为Ｓ２（△ｍｎ＾（ｉ））称为二元ｋ次一阶光骨的样条函数空间，进一步，引入其子空间Ｓ２（△ｍｎ＾（ｉ））＝（ｓ∈Ｓ２（△ｍｎ＾（ｉ））：Ｄａｓ（．，ｙｎ），Ｄａｓ（０，．），ａ＝０，１），称为双周期ｋ次样条空间，本文给出了Ω的非均匀（Ⅱ）型三角     

亚纯函数涉及亏函数的相对亏量

该文研究了整函数和亚纯函数涉及亏函数的相对亏量，将Ｓｉｎｇｈ关于亚纯函数相对亏量的结果推广到亏函数的情况，主要得到了下面的一些关系式：（１）Ｈｒ＾（ｋ）（Ａ（Ｚ），ｆ）≤２－｛δ（０，ｆ）＋Ｈ（∞，ｆ）｝Ａ（Ｚ）≠０，∞；（２）δ＾（ｋ）ｒ（∞，ｆ）≤３／２－１／２｛δ（０，ｆ）δ（Ａ（Ｚ），ｆ）｝，Ａ（Ｚ）≠０，∞；（３）如果δ（０，ｆ）＝δ（∞，ｆ）＝１，则Ｈ＾（ｋ）ｒ（Ａ（Ｚ），ｆ）＝０。     

各向异性H^p（R^n）上的乘子定理

当ｔ〉０且１＝α１≤α２≤…≤αｎ，高Ａｔ＝ｄｉａｇ（ｔ＾αａ，…，ｔ＾αｎ）是＾Ｎ／｛０｝上各向异性连续变换群。当Ｌ＾∞（Ｒ＾ｎ）中的函数ｍ，以及适当选取的Ｃ＾∞０（Ｒ＾ｎ）中的函数η和任意的δ〉０，定义ｍδ（ξ）＝ｍ（Ａδ（ξ）＝ｍ（Ａδξ）η（ξ）。证明了当０〈ｐ〈１，γ＝Σ＾ｎｉ＝１αｉ且ｍδ属于各向异性的Ｈｅｒｚ空间Ｋγ（１／ｐ－１），ｐ１（Ｒ＾ｎ）时，ｍ是各向异性Ｈ＾ｐ（Ｒ＾ｎ）上的乘     

具有间断非线性的微分方程之正解的存在性

证明了二阶微分方程两点边值问题ｕ＂＋Ｐ（ｔ）ｆ（ｕ）＝０，αｕ（０）－βｕ＇（０）－βｕ＇（０）＝γ＇（１）＋δｕ＇（１）＝０至小存在一个正解，只要ｆ（ｕ）于两个端点ｕ＝０和ｕ＝＋∞处同时是超线性的或者是次线性的．这里所采用的条件容许ｆ（ｕ）具有第一类的间断点，同时也容许ｐ（ｔ）在［０，１］的某些子区间上恒为零．     

非均匀（Ⅱ）型三角剖分下双周期二次样条空间S_2~1（△_（mn）~（2））

设Ω＝［０，Ｘｍ］　［０，ｙｎ」，Ω的熟知的非均匀（Ⅰ）、（Ⅱ）型三角剖分分别记为△ｍｎ（ｉ），ｉ＝１，２．△ｍｎ（ｉ）上的分片二元ｋ次Ｃ１多项式的全体记为Ｓ２１（△ｍｎ（ｉ）），称为二元ｋ次一阶光滑的样条函数空间．进一步，引入其子空间Ｓ２１（△ｍｎ（ｉ））＝｛ｓ∈Ｓ２１（△ｍｎ（ｉ））：Ｄａｓ（·，０）＝Ｄａｓ（·，ｙｎ），Ｄａｓ（０，·）＝Ｄａｓ（Ｘｍ，·），ａ＝０，１｝．称为双周期ｋ次样条空间．本文给出了Ω的非均匀（Ⅱ）型三角剖分△ｍｎ（２）下双周期二次样条空间Ｓ２１（△ｍｎ（２））的维数及一组基底．     

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