一类拟线性椭圆型方程的多重解

运用对称形式的山路引理在索伯列夫空间W^1,4(Ω)中讨论一类拟线性椭圆型方程的多重解问题，证明了这类拟线性椭圆型方程存在无穷多个广义解。     

有界洞型区域内一类半线性椭圆型方程边值问题的可解性

半线性椭圆型方程边值问题是一个重要问题,本文利用不动点定理和极值原理,研究了有界洞型区域内一类半线性椭圆型方程边值问题解的存在性与唯一性。当这类问题给定的函数满足特定条件时,问题就有解,作为定理的应用,给出了一个实例。     

拟线性椭圆型方程的多重解

本文利用临界点理论讨论二阶拟线性椭圆型方程Dirichlet问题的多重解的存在性。我们先证明了一类偶泛函存在着无穷多个临界点,然后证明了一类强非线性椭圆型方程正解的存在性。     

一类半线性椭圆型方程边值问题的可解性

在偏微分方程研究领域中,对半线性椭圆型方程边值问题的研究一直是主要研究方向之一,特别是半线性椭圆型方程边值问题正解的研究热点不断;该文利用Levay-Schauder不动点定理研究了一类半线性椭圆方程在有界正则域中正解的存在性、不存在性以及解的唯一性,作为定理的应用,给出了一个应用实例.     

临界增长的Laplace方程的Neumann边值问题

利用临界点理论讨论了一类临界增长的半线性椭圆型方程在超线性边界条件下Ｎｅｕｍａｎｎ问题的解的存在性和多解性     

强奇系数拟线性椭圆型方程Dirichlet问题的广义解

本文讨论一类系数带有强奇性的二阶拟线性椭圆型方程Dirichlet问题的广义解,得到了解存在的条件;并且也给出例子说明,对于这类椭圆型方程,它在W_0~(1,2)(Ω)中的广义解一般来说是无界的。     

一类非线性椭圆型方程正解的存在性与唯一性

近年来 ,在非线性数学物理、生物等学科中涌现出大量的非线性椭圆型方程 ,对这类方程解的存在性、唯一性或多解性以及解的性态的研究 ,引起了国内外许多数学工作者的关注。该文主要采用 Banack空间中的不动点定理 ,研究了一类半线性椭圆型方程正解的存在性与唯一性 ,并且获得这类椭圆型方程正解存在的一个必要条件。     

一类拟线性椭圆型方程Neumann问题非平凡解的存在性

本文利用山路引理证明一类拟线性椭圆型方程Ｎｅｕｍａｎｎ问题非平凡解的存在性。     

一类半线性椭圆型方程边值问题的正径向解

研究半线性椭圆型方程解的问题有拓扑度理论,不动点理论。本文利用不动点定理讨论了一类半线性椭圆型方程边值问题正径向解的存在性。当这类问题中给定的函数满足特定条件时,问题就存在正径向解,并举例作了说明。结合实例对此类问题解的唯一性及不存在性也作了研究。     

一类拟线性椭圆型方程Dirichlet问题的上下解方法

利用上下解方法,借助变分不等方程,在一般条件下证明一类拟线性椭圆型方程Dirichelt 问题广义解存在性。     

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