一些自反和超自反的L（H）的子空间

讨论了算子子空间的自反和超自反性，获得了一些亲的自反和超自反算子子空间。     

算子子空间直和的自反性与超自反性

本文给出了算子子空间直和为k-自反和超自反的充要条件。     

n—超自反子空间

本文给出了S~((n))是超自反的几个等价条件,并且也证明了S是自反的,但S不是超自反的,则不存在包含S的最小超自反子空间。另外还讨论了自反的遗传性。     

自反和超自反子空间的一些性质

本文给出了一些方法如何构造一些自反和超自反的子空间,讨论了它们的一些性质。在本文中,H表示复数域C上的Hilbert空间,所有投影均指正交投影。定义1 φ为L(H_1,H_2)的范数闭子空间,若T∈L(H_1,H_2),满足x∈H_1,Tx∈∈〔φx〕有T∈φ,则称φ为自反的。. 定义2 φ为L(H_1,H_2)的范数闭子空间,称φ为超自反的,如果存在常数K满足T∈∈L(H_1,H_2), d(T,φ)≤ksup{‖P~1TQ‖:P、Q分别为H_2和H_1中的投影并且P~1φQ=0}。满足上式的最小常数k记为k(φ)。引理1 若φ为L(H_1,H_2)中范数闭的子空间,则T∈L(H_1,H_2),sup{d(Tx,φx):     

关于Banach空间上算子代数的超自反性

在自反Banach空间上引入S超自反的概念,讨论了S超自反与算子代数超自反的关系,同时讨论了超自反算子代数直和的超自反性.     

广义James空间的自反子空间

文[1]给出了构造James空间的一般方法,从而给出了一大类一阶次自反空间,本文感兴趣的则是这类空间的自反子空间问题。我们给出了一般形式的James空间的某种自反子空间,还详尽地讨论了在正交正则空间上构成的James空间的自反子空间问题,得到了与文[5]同样好的结果。     

六元子空间格的自反性

目的研究六元子空间格的自反性。方法以序和及构造算子代数为工具。结果给出了复可分Hilbert空间上六元子空间格的14种同构类型,证明了图1中(1),(2),(3)和(9)型六元子空间格是自反的;在有限维Hilbert空间中,(6),(7),(10)型六元子空间格不是自反的;差一维实现的(4),(5),(8)型六元子空间格是自反的。结论所刻画的六元子空间格11种同构类型的自反性,亦可用于解决(11),(12),(13)型六元子空间格的自反性问题。     

有限维Hilbert空间的强自反子空间格代数模的性质

定义了空间格代数的(弱闭双边)模，对有限维Hilbert空间的强自反子空间格代数的模中的有限秩算子进行了讨论，得到有限秩算子一定可以表示为秩l算子的和．     

J-凸Banach空间的齐性特征

给出Banach空间X成为J-凸空间的齐性条件，并且利用它去证明X是超自反的当且仅当Lebesuue－Bochner函数空间Lp（μ，X）是超自反的，其中P＞1是固定的实数。     

赋范空间的Riesz子空间

赋范空间Ｘ的一个真闭子空间Ｍ称为Ｒｉｅｓｚ子空间，如果存在ｙ∈Ｘ＼Ｍ，使得对任何ｘ∈Ｍ都有１。讨论了Ｒｉｅｓｚ子空间与可逼近子空间的关系；用Ｒｉｅｓｚ子空间刻划了实Ｂａｎａｃｈ空间的自反性，进一步得到Ｐｅｔｔｉｓ定理的一个逆定理。定理１可逼近的真闭子空间是Ｒｉｅａｚ子空间，反之不然。定理２实Ｂａｎａｃｈ空间是自反的当且仅当它的每个真闭子空间都是Ｒｉｅｓｚ子空间。定理３若实Ｂａｎａｃｈ空间的每个真闭子空间都是自反的，则它本身也是自反的。     

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