2—块AOR方法求解大型稀疏最小二乘问题的一个收敛定理

给出了用2-块AOR方法求解大型稀疏最小二乘问题收敛的充分必要条件和若干充分条件。当取r=W时，使[3] 中的相应结果成为本文的推论。结果表明，适当选择参数，2-块AOR方法总是收敛的。     

预条件AOR迭代法的一个注记

本文考察了Evans等人提出的预条件AOR迭代法（见[3]），给出部分可约L一矩阵应用于该方法的一些结论．     

非对称AOR迭代法的收敛性

介绍了求解非奇异线性方程组Ax=b的非对称AOR迭代法，并给出了系数矩阵A为正定阵时该迭代法收敛的充分条件。     

L-矩阵的AOR和预优AOR方法在二级迭代过程中收敛性的比较

考虑线性系统Ax=b,当A为L-矩阵时,通过利用AOR迭代方法收敛的谱半径与预优AOR方法的比较,给出了在二级迭代的情况下,外迭代的R1-收敛因子更为精确的结果.     

一类预条件后AOR迭代法中的最优参数选取

解大型线性方程组 Ax=b时,运用预条件P=(I C)加速AOR迭代方法的收敛性,并得到预条件后AOR迭代法中最优参数的选取.最后给出一个数值例子.     

关于解大线性系统的推广的双参数松驰法的收敛性

本文应用Evans~[1]的预处理技巧,定义了某些解大线性系统AX=b的推广的双参数松弛法(简称为ETOR方法)。Jacobi、Gauss-Seidel、SOR、SSOR、AOR和TOR~[2]迭代法均可作为其特例。然后,当系数矩阵具有特殊性质:例如Hermite正定,H-及L-矩阵、不可约弱对角占优…等,对所考虑的迭代法,建立了某些收敛定理。     

相容次序矩阵AOR迭代的最优参数选取

讨论当线性方程组Ax=b的系数矩阵A为(1,1)相容次序矩阵且其Jacobi特征值为纯虚数或零时,AOR迭代的收敛性问题,得到此类方程组AOR迭代的收敛区间,并在收敛范围内分段讨论,进而得到最优参数及与之相应的谱半径,用实例给出了结论的一些应用.     

关于A[a，b]包含B[a，b]的一个反例

在证明了unD∞→u等价于lim∞ send(un)=send(u)的基础上举了一个反例f∈A[a，b]但f∈B[a，b]，并给出了此例的详细证明．     

关于积分第二中值定理的探究

积分第二中值定理给出了ξ在闭区间[a，b]上取值的条件，本文在此基础上给出了ξ在开区间(a，b)内存在的一个充分条件以及ξ在(a，b)内唯一存在的充分条件．     

偶图的分数因子

设G=（V，E）是一个无向简单图，a和b是两个非负整数，若函数f：E→[0，1]对所有的x∈V均满足a≤∑e∈xf（e）≤6，则称，为G的一个分数[a，b]-因子。此时，若还有a=b=k，则称f为G的一个分数k-因子，文章给出了偶图有分数k-因子的一个充分必要条件，并给出一个相关结论。     

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