一类二阶非线性泛函微分方程的振动性

讨论了非线性二阶泛函微分方程(r(T)φ(x(t))x′(t))′ P(t)x′(t) q(t)f(x(α(t)))=0的振动性，得到了该方程所有解振动的充分条件，推广了M．M．A．El-Sheikh和R.Sallam(Appl.Math．Comput．，2000，115：113-121)及H．J．Li(J．Math．Anal．Appl．，1995，194：217-234)等人的结果．     

G-H-空间中KKM定理的变形

作为古典的KKM映像的推广，R．U．Verma(On a generalized class of minimzx inequalities[J].J Math Anal Appl,1999,240(2):261-366.）介绍了G－H－空间的概念，引入了I－G－H－KKM映像，得到了一些新结果。给出了G－H－空间中KKM定理的一种形式，并得到G－H－空间中Ky Fan型sup inf sup形式不等式。     

学术团队介绍 应用泛函分析

应用泛函分析学术团队现有教授3人，其中博士生导师2人，具有博士学位的教师7人，教师平均年龄不超过45岁。目前承担了国家自然科学基金3项，其他各级各类项目10余项。近几年来，先后在Pacific J．Math．、Tohoku．Math．J．、Nagoya Math．J．、J．Math．Anal．Appl．、中国科     

广大学人——曹广福教授

曹广福，1960年出生，理学博士，教授，博士生导师。先后主持国家自然科学基金、教育部博士点基金、教育部骨干教师资助计划等多项国家级与省部级科学研究基金项目。长期从事基础数学研究工作，在Pacific J．Math．、Naqoya Math．J．、Tohoku Math．J．、J．Mafh．Anal．Appl．、中国科学、数学学报、数学年刊等国内外有重要影响的刊物上发表论文40余篇，     

某些新的含N个独立变元的积分不等式

本文证明了若干多元积分不等式。它们概括了单变元的Gollwitzer不等式[Proc. Amer. Math. Soc. 23(1969), 542-547],在多变元情况推广了一些近期的结果,如Bondge及Pachpatte [J. Math, Ahal. Appl. 72 (1979), 533—544],shih及yeh [J. Math. Ahal. Appl. 84 (1981), 569—583].我们对这类不等式指出了一种新的应用方法,它不同于文献中常见的应用方式。     

二阶强次线性微分方程解的振动性质

讨论了一类二阶强次线性微分方程解的振动性质,建立了两个新的振动性定理,推广和改进了Grace和Lalli(J Math Anal Appl,1987,123:584-588)的结果.     

随机竞争Lotka-Volterra系统的正周期研究

主要研究随机竞争Lotka-Volterra系统的周期系数,得到该方程周期解存在性和全局吸引性的充分条件.即使是在特殊情况下,结果也改进了文献(Jiang D,Shi N,Li X.J Math Anal Appl,2008,340(1):588-597.)中的结果.     

一类一阶脉冲微分方程的比较结果

考虑一阶脉冲微分不等式y′(t) +My(t) +N |y(t) |≥ 0 ,a.e.t∈ [0 ,T]\{ tk} ,Δ y(tk) - Lky(tk)≥ 0 ,　　　 k =1,2 ,… ,p,y(0 ) - y(T)≥ 0 ,其中 Lk>- 1,k=1,2 ,… ,p,M,N∈ R,得到了不等式所有解满足 My(t)≥ 0的一个充分条件为e( | M| - N ) T>∏pk=1(1+Lk) sign M,推广了蒋达清等 (J.Com put.Appl.Math.2 0 0 1,136 :189- 197)及何智敏等 (J.Math.Anal.Appl.2 0 0 2 ,2 72 :6 7- 78)的部分结果     

等价于Fan-Knaster-Kuratowski-Mazurkiewicz定理的不动点定理

最近Tarafdar(J.Math.Anal.Appl.128(1987),475—479)获得了一个不动点定理并证明了这个定理与Fan 的定理(Math.Ann.266(1984),519—537)等价,后一个定理是著名的Knaster-Kuratowski-Mazurkiewicz 定理(Fund.Math.14(1929),132—137)的推广,本文主要目的是推广Tarafdar 的不动点定理并证明所得的一个不动点定理和Fan 的定理等价.     

集值拟变分不等式的间隙函数和误差界

首先研究集值拟变分不等式的间隙函数,然后利用该间隙函数建立集值拟变分不等式与优化问题间的等价关系,利用这一等价关系讨论集值拟变分不等式的误差界问题,这些结论是文献(Fan H J,Wang G X.Comput Appl Math,2010,233:2956-2965和Tang G J,Huang N J.Taiwanese J Math,2013,17:1267-1286.)中相关结果的推广.     

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