矩阵的弱迹和弱迹定理

本文首先提出了矩阵的弱迹概念,并对于一类可对称化的非对称矩降证明了两条定理,即证明弱迹均小于寻常的追迹,并大于矩阵的最大特征值。故以此弱迹作为最大特征值的上界,比追迹优越得多.应用本文的定理可以建立一系列精度越来越高的近似计算式,其精度比追迹定理所给出的值有大幅度的提高.     

一类特征值问题的迹公式

本文利用文献［２］的结果，得到了一类特征值问题Ｙ＿ｘ＝ＭＹ的迹公式，其中Ｍ为含特征参数的２×２矩阵。     

迹与亦迹的相关性质

在半模范畴中迹与亦迹的基础上,进一步研究了迹与亦迹的性质,得到了它们与生成子和余生成子的关系。特别地,迹TrM(Д)很好地描述了半模RM与生成子的接近程度。     

一类矩阵迹的不等式

本文利用Young不等式和Lieb-Thirring不等式,给出一类矩阵迹的新的不等式,且推广了一些文献的结果。     

正对角相似迹占优阵的特征值分布及其稳定性

屠伯埙曾连续著文讨论迹占优阵的非异性及其特征值之分布。本文给出一类更广泛的称为正对角相似迹占优阵及正对角相似共轭迹占优阵的矩阵的特征值之分布及其为稳定阵的充分必要条件。     

一类四阶特征值问题的迹公式

本文讨论了一类四阶特征值问题的一些基本命题，获得了特征值的若干性质和渐近估计，由此利用围道积分的方法得到了特征值的迹公式。     

Hilbert空间H中的广义迹

引入了Hilbert空间H中的广义迹,运用算予理论方法,讨论了Hilbert空间H中的广义迹的一些刻画,证明了H中的广义迹与迹相等的充分必要条件为H中框架是正规紧框架.     

常型Sturm-Liouville算子特征值的渐近式和迹公式

应用迭代法计算了自伴型Sturm-Liouville微分算子特征值的渐近式,据此给出了算子的一类迹公式,并计算出其正则项和迹量.     

正定厄米特阵的行列式与迹间的不等式

本文考虑了复数域上正定厄米特矩阵的行列式与迹间的一类不等式，得以了几个有趣的不等式。     

空间极迹与本体极迹关系的探讨

由刚体力学知道,作平面平行运动的刚体(或称薄板),当其角速度不为零时,在任一时刻薄板上恒有速度为零的一点,这点称为转动瞬心,常以C表示。转动瞬心C在固定平面上所描绘的轨迹为空间极迹,而在薄板上所描绘的轨迹称为本体极迹。1 空间极迹和本体极迹的参数方程 刚体的平面运动,是其随基点的平动和绕基点的转动的复合运动。刚体上任一点可     

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