一类含参数相似广义互联系统的鲁棒控制

研究了一类含参数的相似广义互联系统,应用一般广义系统的受限等价、状态反馈的方法,根据系统具有相似结构的特点设计了状态反馈控制器,使得系统渐近稳定。研究表明,由于相似广义互联系统的特殊结构,可简化含参数相似广义互联系统的控制器设计。     

一个基于状态反馈的广义系统H_∞控制

讨论了一类较一般的广义系统基于静态状态反馈H∞控制问题,得到了该问题可解的充分必要条件是一个基于系统参数阵的广义代数Riccati不等式有满足广义约束的非奇异解,同时也给出了满足该问题的反馈矩阵构造方法     

不确定广义系统状态反馈控制的完整性设计

该文研究一类参数不确定广义系统具有完整性的状态反馈控制系统设计问题。目的是设计状态反馈控制律，使得广义闭环系统对所有允许的参数不确定性和任一状态传感器失效都正则，无脉冲且稳定。利用广义系统稳定性的有关结论，将不确定广义系统具有完整性的状态反馈设计问题转化为广义Riccati不等式的求解，最后通过数值算例说明该文设计方法的有效性。     

不确定广义系统的鲁棒正实控制

在参数不确定性广义系统中引入广义二次严格正实的概念,利用线性矩阵不等式,得到了状态反馈作用下,不确定广义系统鲁棒广义二次严格正实控制律存在的充要条件,并给出了基于状态反馈的不确定广义系统鲁棒广义二次严格正实控制器的设计方法.     

基于状态反馈的区间广义系统鲁棒H∞控制

讨论了区间广义系统基于状态反馈的鲁捧H∞控制问题；得到了该问题可解的充要条件是一个基于系统参数控阵的广义代数Riccati不等式有满足广义约束的解，同时也给出了满足该问题的反馈矩阵的构造方法；最后，举例说明了所得的主要结果。     

基于状态反馈的区间广义系统鲁棒H∞控制

讨论了区间广义系统基于状态反馈的鲁棒H∞控制问题;得到了该问题可解的充要条件是一个基于系统参数矩阵的广义代数Riccati不等式有满足广义约束的解,同时也给出了满足该问题的反馈矩阵的构造方法;最后,举例说明了所得的主要结果.     

广义系统结构稳定状态反馈和极点配置

应用矩阵奇异值分解研究当m相似文献   

区间广义系统的鲁棒H_∞控制

讨论了线性时不变区间广义系统基于状态反馈的鲁棒H∞控制问题·利用区间矩阵的一种等价描述形式,将所讨论的区间广义系统转换成一般的线性时不变不确定广义系统,给出了区间广义系统二次稳定且具有扰动衰减度γ及二次能稳定且具有扰动衰减度γ的概念,得到了该问题可解的充要条件是一个基于系统参数矩阵的矩阵不等式有满足广义约束的解,同时也给出了满足该问题的反馈矩阵的构造方法·     

一类不确定广义系统的鲁棒H∞控制

主要考虑一类具有有界扰动不确定广义系统的二次稳定问题.通过变换的方法,将比例导数反馈镇定不确定广义系统H∞控制问题转化为增广不确定广义系统的状态反馈H∞控制问题.证明了不确定广义系统比例导数状态反馈(PDSF)H∞鲁棒控制与增广系统比例状态反馈(PSF)H∞鲁棒控制问题的等价性.应用LMI方法,给出不确定广义系统具有H∞性能指标γ的充分条件及鲁棒控制器的设计方法.最后,数值例子说明定理的有效性.     

传热分布参数系统最优状态反馈控制设计

在对工业分布参数系统开环最优控制研究的成果基础上,本文进一步讨论如何实现分布参数最优反馈控制的问题。设计了线性二次型最优状态反馈控制器,描述了在双曲型和抛物型的实际传热过程中的应用。对分布参数系统的可观测性及状态估计问题也作了初步探讨。     

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