具有再生核Hilbert空间中紧的偏微分算子

用再生核函数来刻画再生核空间中算子的性质,是研究再生核空间性质的一个重要方法.在本文中,研究了具有再生核的多元整函数Hilbert空间的基本性质,着重讨论了偏微分算子在该空间上的紧性,给出了一个用再生核函数刻画的偏微分算子是紧算子的充分必要条件,从而在具有再生核的多元整函数Hilbert空间上推广了已有的结果.     

空间变化的二值形态算子核元的研究

在对平移不变的二值形态算子核元研究的基础上,将其相关性质扩展到空间变化的形态算子,研究了空间变化的形态算子核元的基本性质,并给出了在已知核元的基础上产生新核元的几种方法.所有性质的建立都给出了相应的推证过程.研究结果表明:空间变化的形态算子的核元保留了平移不变形态算子核元的大多数性质.     

再生核空间中的最佳插值逼近算子

构造了一个具有再生核的张量积空间并利用再生核与算子张量积方法，给出了二元实函数非多项式型最佳插值逼近算子的显式表达式，证明了它对无限加密的矩形网格节点系是一致收敛的，而且误差按空间范数单调下降。     

再生核空间的有界线性算子的最佳逼近

讨论不同的再生核空间的有界线性算子的最佳逼近问题,利用空间的再生核给出了最佳逼近算子的表达式,并且对最佳逼近算子的收敛性进行了讨论.     

以闭线性算子的核为模的商空间

在自反Banach空间中,对于闭线性算子的核为模的商空间,利用空间对偶映射与该算子核的直交补,给出一种具体的表示.     

关于核空间的一个性质

1955年A.Grothendieck在他的论文里给出了核空间的准确定义,同一年,和在考虑微分算子的特征展开问题时也提出了核空间的概念。下面是按Grothendieck的核空间的定义:设E是一个完备的可数模空间,它的拓扑由可数个模给出     

一类算子方程的正解

设A,B,C是Hilbert空间 上三个有界线性算子．利用算子矩阵分块技巧,在B＊的核空间包含A＊的值域空间或A的核空间包含B的值域空间的情况下,研究了算子方程AXB—C有正解的充分必要条件,并给出了正解的一般形式．     

一类算子在哈代空间上的弱型估计

研究了相应于齐次群的哈代空间上一类卷积算子的弱有界性.利用卷积核的条件得到核的尺寸估计,通过这个估计,利用原子分解理论和极大函数理论,得到了一类卷积算子从哈代空间到弱勒贝格空间是有界的.作为应用,讨论了广义Bochner-Riesz平均的极大算子与球平均极大算子在哈代空间上的弱有界性.     

部分Hardy空间上的Toeplitz算子

探讨了部分Hardy空间上的Toeplitz算子的性质.特别地,刻画了部分Hardy空间上的Toeplitz算子及其共轭的核,得到了一类Toeplitz算子为部分Hardy空间上的正规算子的充要条件     

再生核空间算子样条插值函数

在具体的再生核空间Ｈ＾１０中，解出了再生核的解析表达式，并建立了空间Ｈ＾１０中的微分算子样条插值函数与再生核的联系，丰富了再生核空间微分算子样条函数的一系列重要性质。     

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