线性时不变奇异系统预解矩阵的计算方法

文中提出了求解线性时不变奇异系统预解矩阵(Es—A)~(-1)的几种计算方法。主要介绍了det(Es—A)多项式系数的几种求法以及由此系数得到矩阵多项式adj(Es—A)中系数矩阵的递推公式。文中介绍的算法可以考虑E为奇异A为准奇异以及e、A皆为奇异的情形,并给出了算例。本文的工作为线性时不变奇异系统的研究提供了方便。     

线性代数中几个定理的新证法

对线性代数中关于矩阵秩的几个公式与特征多项式的性质定理给出了新的证明方法，用齐次线性方程组解空间的理论证明了矩阵秩的６个定理，利用矩阵和的行列式定理给出了矩阵Ａ的特征多项式系数及Ａ的主子式关系定理的新证法。     

一种散乱点双三次多项式自然样条插值

 考虑对空间散乱点的一种双三次多项式样条插值, 使得插值函数对x与对y的二阶偏导数平方积分极小(带自然边界条件)。用希氏空间样条方法,得出其解可表为一个双一次多项式与分片双三次多项式之和。它的系数能够用线性代数方程组确定,方程组系数矩阵对称,可用改进的平方根法解。例子表明方法简单,效果良好。     

图的ABC矩阵的Sachs定理与能量

基于图的ABC指标,数学化学家Estrada提出图的ABC矩阵,并且发现ABC矩阵在量子化学中存在广泛的应用.本文主要研究图的ABC矩阵的系数性质和与其对应的图能量极值性质.通过建立有向图与无向图之间的对应关系,给出了一个图G的ABC矩阵对应的特征多项式的各项系数与图的结构之间的关系,并给出了矩阵能量对应的积分公式.利...     

用于有损信息压缩的可加密Block-LDGM码设计

设计了一种可用于加密的块结构低密度生成矩阵Block-LDGM码.该码的生成矩阵由一组交织子矩阵组成,且这些交织子矩阵可以用二次交织多项式来描述.以这些二次交织多项式的系数作为密钥,可实现对交织子矩阵的随机化,从而实现对Block-LDGM码的加密.基于三分图,提出多边缘置信度传播算法和滤波衰减消解方法,实现基于Block-LDGM码的低复杂度信息压缩编码.仿真结果表明:设计的可加密BlockLDGM码,具有近香农限的压缩性能,同时具有较高的保密能力.     

(D)4型箭图的 Hall 多项式

利用仿射箭图的表示范畴的性质把 Hall 多项式的计算问题归结到一些矩阵方程的解的个数问题.用此方法,得到了(D)4型箭图的不可分解予投射予内射表示的 Hall 多项式.     

矩阵多项式及其算法评述

近年来非线性数值代数的一个重要方向是对矩阵多项式的算法及其理论体系的研究。并且,取得了不少成果。见Ddnnis,Traub和Weber。这方面的研究课题,除矩阵多项式的代数理论外,还有诸如矩阵多项式的算法,矩阵多项式解的收敛性(局部收敛和全局收敛)、矩阵多项式特征根的求法、矩阵主解与特征根的关系以及主特征根     

完全图的谱

本文通过组合数学和矩阵论的方法获得了完全图的特征多项式和谱,指出完全图的特征多项式的系数与图的结构之间的关系,并证明了邻接谱、拉谱拉斯谱和无符号拉谱拉斯谱三者之间的关系.     

新预条件下矩阵不同分裂的收敛性分析

近年来对于求解线性方程组的技术有了很大的发展,特别是预条件技术的出现使得解线性方程组的速度有了很大的提高,在预条件技术中最主要的是怎样去找一个合适的预条件子,本文提出了一个新的预条件子,不但证明了当线性方程组的Ax=b系数矩阵为非奇异的M-矩阵和H-矩阵时,在新预条件子作用下它们的收敛性,还得到了在新预条件下PSOR、PJOR等的收敛速度明显快于以往经典SOR、JOR迭代法,从而证明了本文提出的新预条件子的优越性.     

矩阵指数函数的一种计算

将矩阵指数函数的幂级数展开式表示为一个矩阵多项式形式，给出矩阵指数函数的一个有限展开式，通过矩阵特征值及矩阵指数函数的有限展开式的各阶导数，构造出一个线性方程组，用解线性方程组的方法给出该矩阵多项式的系数计算。从而给出了用求解线性方程组的方法计算矩阵指数函数e^A及e^At。     

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