能控性与能达性

本文详细地证明了在线性定常系统中能控性与能达性的一致性。举例说明了在非线性系统中能控性与能达性是不一致的,讨论了广义系统中能控性与能达性的关系。     

电力系统能控性与能观性研究

电力系统是一个的典型的非线性系统。目的:研究单机无穷大电力系统在非线性模型下的能控性与能观性;方法:采用微分几何理论中的李导数、李括号和李代数等方法;结果:证明单机无穷大系统是局部弱能控和局部弱能观的;结论:微分几何理论和方法是非线性系统分析和设计的有效方法,无穷大系统是局部弱能控和局部弱能观的,结论适用于任意输入、输出的情况。     

永磁同步电动机系统的能控性与能观性分析

永磁同步电动机系统是一类仿射非线性系统．该文应用非线性控制系统的几何理论对它的能控性与能观性进行分析,证明了永磁同步电动机系统在一定范围内是局部弱能控的、强可接近的和局部弱能观的．     

定常非线性系统能控性的分析

针对定常解析非线性系统进行能控性分析，采用微分方程级数解法得到状态方程的一般级数解，用作能控性分析的基本依据。用广义隐函数存在性定理为工具，结合定常解析非线性系统结构特征，分析了定理充要条件的物理意义，该充要条件与能控态点集的特征。进而得到弱能控的充要条件和能控的必要条件。对称性分析中，取得了状态转移局部对称性的充要条件。给出了能控性分析算例，表明对定常解析非线性系统能控性分析是方便有效的。     

多机电力系统的能控性与能观性

讨论了多机电力系统能控性和能观性问题,以非线性微分几何理论为工具,给出了一般仿射非线性系统的能控性和能观性的定义及其判据,然后将多机电力系统数学模型作为n维流形上的非线性系统,并将其状态看作流形上的局部坐标.对多机系统数学模型进行了适当处理,在不失一般性的前提下,以二机电力系统作为讨论对象,分析得出了相应的结论.参5.     

布尔控制网络关于任意输入的能达性、能观性和能检性

在矩阵半张量积理论框架下，研究布尔控制网络关于任意输入的能达性、能观性和能检性问题。首先研究在任意输入下布尔控制网络的能达性，提出任意输入下的能达性和集能达性定义，并构造检验系统在任意输入下能达（集能达）的能达性矩阵（集能达性矩阵）。其次，应用任意输入下集能达性的研究结果，研究布尔控制网络在任意输入下的能观性和能检性问题，获得这两个问题可解的充分必要条件。最后，给出两个例子验证所得理论结果的有效性。     

线性系统Hamilton扩张系统的能控性和能观测性

利用控制系统的微分几何理论,研究了线性系统和它的Hamilton扩张系统的能控性之问的关系以及它们的能观测性之间的关系.通过计算线性系统的能控性矩阵和它的Hamilton扩张系统的能控性矩阵,证明了线性系统和它的Hamilton扩张系统的能控性是等价的.同时通过计算线性系统的能观测性矩阵和它的Hamilton扩张系统的能观测性矩阵,证明了线性系统和它的Hamilton扩张系统的能观测性也是等价的.证明了线性系统的Hamilton扩张系统是能控的当且仅当它是能观测的,原线性系统既是能控的,又是能观测的.     

离散定常线性系统能达性与能控性的注记

证明离散定常线性系统能达性与能控性两种定义的等价性,并改进了能达性与能控性基本判定定理的证明.     

量化网络控制系统的能控性与能观性

将网络引入控制系统不可避免地引起很多新的问题,传统意义下的系统能控性与能观性在应用到网络化系统时必须重新考虑.针对网络控制系统中普遍存在的信息量化问题,研究网络控制系统的基本问题.定义量化网络控制系统的能控性与能观性,给出系统能控和能观的充分条件,指出量化网络控制系统的能控性与能观性取决于量化阶距的选取.     

线性随机系统的能控性指数和能观性指数

提出线性随机系统能控性指数和能观性指数的定义，并给出了能控性指数和能观性指数的两个估计式。     

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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