加速度观测器设计与仿真

介绍了利用状态反馈综合带加速度反馈的最优控制系统，利用系统所检测的位置量和速度量设计了加速度观测器，并对综合的最优控制系统进行仿真，包括系统幅频、相频特性及状态估计值与真实状态之间的误差，最后给出了有、无加速度观测器反馈时系统跟踪晃动误差曲线。带加速度观测器反馈系统使晃动误差减小84％，滤除噪声的效果也比较好。     

区间系统稳定性及其反馈镇定

给出一类区间系统稳定性的判别准则，并基于此稳定性的判别准则，深入地讨论了在状态反馈下二阶区间控制系统可鲁棒镇定的条件，进而绘出了这类区间控制系统鲁棒状态反馈控制器的设计准则和方法。     

控制系统状态方程式的等价结构与应用

控制系统状态方程式有许多不同的结构,可以互相转换以适应不同实际需要.文中推荐一种分段状态观测器,可增加状态反馈的个数,降低工业噪声与微分运算的污染度,从而提高系统的响应速度.     

直接反馈线性化（DFL）的理论体系研究

本文对直接反馈线性化理论进行了系统的总结，归纳，使之成为完整的理论体系，并由系统的状态方程出发，建立了直接反馈线性理论在实际系统中应用的规范化途径。     

有测量噪声的不确定互联系统自适应鲁棒控制

分析了一类具有时变不确定性的互联系统．结果表明，系统的确定部分是可镇定的，不确定的部分被假设为满足匹配条件，而且不确定部分具有锥形界，但此界未知．基于与不确定界有关的确定性质进行控制设计．反馈信息具有测量误差的状态进行控制设计．     

一类不确定系统的鲁棒二次稳定与协方差配置

讨论了一类范数有界时变不确定线性随机系统的鲁棒协方差配置状态反馈控制器设计．给出了协方差可配置的充要条件,同时导出了使闭环系统鲁棒二次稳定的状态反馈增益公式．     

有测量噪声的不确定互联系统自适应鲁棒控制

分析了一为在具有时变不确定性的互联系统，结果表明，系统的确定部分是可镇定的，不确定的部分被假设为满足匹配条件，而且不确定剖分具有锥形界，但此界未知，基于与不确定界有关的确定性质进行控制设计，反馈信息具有测量误差的状态进行控制设计。     

非线性的实时网络控制系统稳定性分析

研究了一般的连续型非线性网络控制系统,利用Razumikhin方法针对网络诱导延时,通过设计状态反馈控制器,得出了使系统状态一致稳定的条件,即状态反馈矩阵和网络诱导延时的最大允许值之间的关系,这是保证闭环系统一致稳定的一般条件.并由此结论给出了一类连续型线性网络控制系统状态反馈矩阵的范数估计及网络最大诱导延时的估计.该结论是基于依赖时滞的方法得出的.最后的数值仿真例子表明该方法的有效性.     

时滞系统复合状态H∞反馈控制

提出了在时滞系统H∞控制中，引入当前状态反馈与时滞状态反馈的问题，应用传递函数与状态空间法相结合的论证方法，给出了时滞系统复合状态反馈的H∞控制的可解判据，同时，得出了复合状态反馈控制律。     

基于异步动态系统的网络控制系统建模

研究了同时存在数据传输延时与数据包丢失的网络控制系统的建模问题．系统中传感器采用时间驱动，执行器与控制器采用事件驱动，传感器的数据采用单包传输．假设传输延时小于采样周期，且数据包传输的成功率一定，则整个网络控制系统可以描述为一个具有2个事件的异步动态系统．针对对象状态均可测，控制律采用状态反馈的情况，利用双线性矩阵不等式方法，讨论了网络控制系统指数稳定的问题，给出了稳定性的充分条件．     

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