基于动态状态观测器的混沌系统同步设计的参数化方法

研究了在有界干扰情况下一类非线性反馈混沌系统的同步动态观测器设计问题。基于Sylvester矩阵方程的参数化解,给出了非线性反馈混沌系统的同步动态观测器矩阵的所有参数化表达式,其所含参量为混沌系统控制设计提供了全部自由度,可适当选择自由参量满足某些鲁棒性指标。最后,数值算例及其仿真结果表明本文所提非线性反馈混沌系统的同步动态观测器的参数化设计方法是简单有效的。     

基于观测器的不确定广义系统D稳定极点配置

研究了具有D稳定约束的不确定广义系统鲁棒状态观测器问题。基于参数矩阵不等式和广义逆理论，提出了一种广义鲁棒状态观测器的设计方法，目的是对于所有容许的参数不确定性，相应的广义状态估计系统是正则，无脉冲，且其有限极点配置在预先给定的圆盘中，从而使整个观测过程具有所希望的鲁棒性和暂态性能；并获得了希望的鲁棒状态观测器增益的存在条件及其解析表达式。     

基于状态观测器的广义系统鲁棒容错控制

针对执行器失效情形,利用广义Riccati方程,给出了基于观测器的广义系统鲁棒容错控制器的设计方法,并根据广义Riccati方程的参数化解,给出基于观测器的鲁棒容错控制器的参数化解.利用该方法设计的动态控制器使所得闭环系统既使在执行器失效和有系统参数不确定的情况下也都是正则、无脉冲、稳定的.数值例子验证了该方法的有效性.     

广义系统的非脆弱观测器设计与镇定控制

为了进一步提高控制器的适应能力,该文研究了基于观测器的广义系统非脆弱控制问题.针对控制器和观测器不确定性都是时不变且有界的情况,应用线性矩阵不等式( Linear matrix inequalities,LMI)方法给出了非脆弱观测器存在条件,应用广义代数Riceati不等式(Generalized algebraic Riccati inequalities,GARI)方法解决了基于观测器的广义系统非脆弱控制问题;给出了非脆弱控制器和非脆弱观测器的参数表达式.数值仿真结果验证了所给方法的有效性和应用.     

基于观测器的具有对称结构的广义大系统的H_∞分散控制

讨论具有对称结构的广义大系统的H∞分散控制问题·通过设计基于状态观测器的状态反馈,借助于广义代数Riccati不等式,给出具有对称结构的闭环广义大系统的H∞分散控制的充要条件·     

基于观测器的非线性广义马尔科夫跳变时滞系统的鲁棒H_∞控制

研究了非线性广义Markov跳变时滞系统的H∞控制问题.得到了增广系统全局指数稳定且具有H∞性能指标的基于观测器的反馈控制器存在的充分条件.通过求解线性矩阵不等式得到了控制器和观测器的增益矩阵.最后用数值算例验证了所提出设计方法的有效性.     

单边Lipschitz时滞系统的H_∞函数观测器设计

主要研究了一类单边Lipschitz非线性时滞系统的H_∞函数观测器设计问题.通过Moore-Penrose广义逆理论与Lyapunov稳定性分析,最终得到了误差动态系统渐近稳定的充分条件.研究成果应用到了一类机器人的观测器设计.     

一类不确定时滞系统的鲁棒H∞可靠控制

研究了一类包含状态时滞和参数不确定系统基于状态观测器的鲁棒H∞可靠控制问题.目的是设计状态观测器不仅使得执行器正常工作时系统渐近稳定,而且使得对于系统中预先指定的执行器子集内的执行器失效时,相应的闭环系统也渐近稳定.借助于议论广义的Riccati矩阵不等式,给出了控制器存在的条件,同时给出了所期望控制器的解析式.最后,通过一个仿真例子,说明该方法的可行性.     

一类基于T-S模糊模型的非线性广义系统的鲁棒H_∞控制

目的解决一类时滞T-S模糊广义系统的鲁棒H∞控制问题.方法利用Lyapunov函数方法、矩阵缩放理论以及线性矩阵不等式(LM I)技术研究了一类基于T-S模糊模型的非线性广义系统的鲁棒H∞控制.结果首先给出了基于观测器的H∞控制器存在的充分条件,保证了闭环系统是容许且具有H∞性能.通过矩阵缩放理论把这个充分条件表示成了线性矩阵不等式形式,得到了H∞控制器设计方法.结论在系统状态未知并且具有时滞和干扰情况下,所提出的方法很好地解决一类基于模糊模型的非线性广义系统的鲁棒H∞控制问题,通过一个数值算例说明了所提方法的有效性和可行性.     

基于时滞补偿观测器的网络化控制系统故障检测

针对一类具有不确定传输时滞的网络化控制系统,基于时滞补偿观测器研究了系统的故障检测问题.在传统的基于观测器的故障检测系统的基础上,根据时滞补偿的思想设计了一种新型的状态观测器,并引入故障的参考模型,得到广义残差系统;利用H∞控制理论,提出了基于H∞滤波器的故障检测方法,并借助线性矩阵不等式(LMI)方法给出了观测器增益矩阵和后滤波器矩阵的解.通过仿真验证了该方法的可行性和优越性.     

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.     

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