CKdV-Bargmann系统的Lie-Poisson结构

研究和CK dV族对应的3×3矩阵特征值问题的非线性化,证明了该系统的非线性化特征值问题是具有L ie-Po isson结构的Po isson流形R3N上的完全可积的广义H am ilton系统.     

Lie-poisson结构下一个新的有限维完全可积系统

研究3×3谱问题的非线性化,证明了该系统的非线性化特征值问题是具有Lie-Poisson结构的Poisson流形R3N上的广义Hamilton系统.进一步,利用母函数法给出其可积性的证明.     

Lie-Poisson框架下一个新的Hamilton系统的可积性

研究一个3×3形式的谱问题的非线性化,证明了该3×3特征值问题的非线性化是具有Lie-Poisson结构的Poisson流形R3N上的广义Hamilton系统.进一步,利用母函数法给出其可积性的证明.     

NLS族非线性化谱问题的复形式

利用Lie群SU(2)和SO(3)之间的关系,引入一个位势和特征函数的实约束来处理NLS族的非线性化问题.证明了NLS族在C2N上的非线性化谱问题是复形式的Hamilton系统.     

含有关联噪声的非线性分数阶系统的扩展卡尔曼滤波器设计

针对含有过程和测量噪声的连续时间非线性分数阶系统的状态估计问题,提出了扩展卡尔曼滤波器算法.采用Grünwald-Letnikov差分定义对非线性分数阶系统离散化.利用输出方程设定待定系数矩阵,得到离散化的差分方程,实现非线性分数阶系统的有效的状态估计,提高状态估计的精度.最后,给出一个实例来说明所提出非线性分数阶系统的扩展卡尔曼滤波器的有效性.     

切换非线性系统的指数拟无源化及其镇定

为解决切换非线性系统的指数拟无源化及其镇定问题,采用多存储函数方法,针对一般切换非线性系统,提出指数拟无源的概念;针对一类切换严格反馈系统,将拟无源化方法和Backstepping技术结合,构造性的设计依赖于状态的切换信号和反馈控制器.研究结果表明:解决切换严格反馈系统的指数拟无源化问题,得到闭环系统的实用稳定性.研究...     

含参数不确定性和扰动的非线性系统的H∞控制

研究一类含参数不确定性和扰动的非线性系统的H∞ 鲁棒控制问题 .给出了这类非线性系统L2 增益有限且系统内部稳定的充分条件 .研究的方法是化含参数不确定性的HJI不等式为若干个不含参数不确定性的HJI不等式 .     

一类具有输入状态稳定未建模动态的非线性系统的输出跟踪控制

研究了具有输入状态稳定(input-to-state stability,ISS)未建模动态的一类非线性系统的全局实际输出跟踪控制问题.该类非线性系统具有非线性参数化的未知参数不确定性,未知的非线性不确定性及未建模动态不确定性.与现有结果不同,所考察的系统具有未知的控制系数,其人小及符号等信息都假设是完全未知的.通过利...     

非线性控制系统的控制器型

M.Zeitz引入了非线性系统的控制器型,证明了由控制器型描述的非线性系统是可控的。本文进一步给出了化一般非线性系统为控制器型的条件及其状态变换的具体算法,从而解决了通过化控制器型证明非线性系统可控性的方法。     

基于神经网络的3自由度移动机器人跟踪方法研究

针对具有2个可操舵驱动轮的3自由度移动机器人的轨迹跟踪问题，利用神经网络的任意非线性逼近能力辨识出3自由度移动机器人的逆运动学模型，使系统的3个独立输入控制线性化，将一般非线性系统转化为仿射非线性系统。根据反馈控制理论，设计了跟踪控制器，使系统具有良好的全局稳定性，实现了移动机器人的位置和方位的独立跟踪。最后，通过仿真验证了算法的可行性和有效性。     

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     

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

正~~