任意m×n阶cobweb网络的等效电阻研究

采用递推变换(RT)方法研究了一类任意m×n阶cobweb网络的等效电阻.首先采用网络分析建立递推矩阵方程模型(包括边界条件方程模型),其次构造矩阵变换获得矩阵的特征值和特征向量以便获得矩阵方程的通解与特解,最后利用矩阵逆变换给出支路电流的解析解,从而获得任意m×n阶cobweb网络任意2节点间的等效电阻公式,所得结果是由特征值构成及单求和表达.作为公式的应用,给出了等效电阻公式在特殊情形下的数个结果,并且给出了任意半无限和无限情形时的数个新的等效电阻公式,在与其他结果比较时发现了一个新的三角函数恒等式.     

用初等变换求解矩阵方程A_(m×n)X_(n×p)=B_(m×p)

利用分块矩阵和矩阵初等变换给出了一个直接求解矩阵方程Am×nXn×p=Bm×p的简捷而实用的方法,并对齐次方程组和非齐次方程组同样可以用此方法很快得到方程组的通解,与文献[1]相比较,该求解方法更加简捷实用。     

体上矩阵方程AXB=C的求解

给出了任意体上的矩阵方程ＡＸＢ＝Ｃ相容的充要条件及其通解的矩阵算法，并给出了任意体上齐次右线性方程组的基础解系的简捷求法     

关于数论函数方程ωЧ（Ч（n））=2ω（n）的可解性问题研究

对任意的正整数n,函数Ч（n）为著名的Euler函数,即在序列1,2,．．．,n-1,n中与n互质的整数的个数;函数ω（n）表示任意正整数n的所有不同质因数的个数。文章利用初等方法研究了Ч（Ч（n））=2ω（n）方程的可解性,并给出了该方程的全部正整数解。     

任意体上的矩阵方程AXB CYD=O

运用任意体上矩阵的广义逆,给出了任意体上矩阵方程ＡＸＢ＋ＣＹＤ＝Ｏ的通解表达式及其仅有零解的一个充要条件．     

方程X~（n）（t）＋P（t）f（h（t）））g（X~（n－1）（t））＝0的振动性

讨论方程ｘ（ｎ）（ｔ）＋ｐ（ｔ）ｆ（ｘ（ｈ（ｔ）））ｇ（ｘ（ｎ－１）（ｔ））＝０的振动性，其中ｎ为偶数．得出方程振动的充分条件．推广和改进了ＳＫＧｒａｃｅ，ＢＳＬａｌｌｉ和ＳＵｒｓｚｕｌａ的结果．     

m×n矩阵k次广义迹

给出了m×n矩阵k次广义迹的概念,并研究了其性质,在此基础上得到了m×n矩阵k次广义迹是矩阵全体特征值的k次初等对称多项式.     

一矩阵方程组的（反）自共轭解

本文约定,Ｆ是一个具有对合反自同构。的任意的体,Ｆ”“”、Ｆｐｍ“”、队分别表示Ｆ上的全体ｍｘｎ矩阵、Ｆ上的全体秩为ｒ的ｍｘｎ阵和Ｆ上的全体ｎ阶可逆阵,ｒａｎｋＡ表示矩阵Ａ的秩,Ｉ;表示ｉ阶单位阵。１９９４年,王卿文［’１研究了任意体上的矩阵方程组ＸｎｘｎＡｎｘｓ－Ａｎｘｓ（ｌ）ＸｎｘｎＢｎｘｔ—Ｏｎｘｔ运用矩阵的广义逆,给出了（ｌ）的有解判定及其通解表达式。１９９８年,王卿文［’仅给出了（ｌ）有亚半正定解的充要条件及其解集结构。本文研究（ｌ）的（反）自共轭解,给出了（ｌ）有（反）自共轭解的充要…     

积分方程x（t）=∫0^1f（t,s,x（s）,x′（s）,…,x^（n）（s））ds的正解问题

本文根据已知的抽象结果，证明了积分方程ｘ（ｔ）＝∫０＾１ｆ（ｔ，ｓ，ｘ（ｓ），ｘ′（ｓ），…，ｘ＾（ｎ）（ｓ））ｄｓ的正解的存在性。     

矩阵方程AX=B与亚（半）正定次自共轭分块矩阵

设Ｆ是一个具有对合反自同构的体，Ω是一个实四元数体。本文在Ｆ上定义了次自共轭矩阵，在Ω上定义了（半）正定次自共轭矩阵及亚（半）正定次自共轭阵，给出了Ω上分块矩阵为亚（半）正定次自共轭阵的充要条件；导出了矩阵方程ＡＸ＝Ｂ有次自共轭解及亚（半）正定次自共轭解的充要条件及其解集结构。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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