一类中立时滞系统的指数稳定控制

文章讨论了一类具有非匹配干扰的非线性时滞系统的指数稳定控制问题,采用线性矩阵不等式方法,给出系统指数稳定条件。     

一类不确定时滞系统的指数稳定弹性控制器设计

讨论了一类不确定时滞系统的指数稳定弹性控制器设计问题。基于李亚普诺夫稳定性理论,采用线性矩阵不等式方法,给出系统指数稳定条件和状态反馈弹性控制器设计方法,使系统指数稳定。所得条件具有较小的保守性,且可以很方便的求解指数稳定度。     

关于稳定矩阵Kronecker积与Hadamard积的一些性质

讨论了稳定矩阵Keroncker积与Hadamard积的一些性质,得到了某些类型稳定矩阵的Ker-onecker积与Hadamard积是稳定矩阵的一些条件。     

具有滞后摄动的线性切换系统的二次鲁棒稳定性问题

讨论了具有时滞摄动的线性切换系统的二次鲁棒稳定性问题,利用单Lyapunov函数构造了一个切换律,使系统稳定,所得结果以矩阵不等时表示,便于实现。     

复广义正定矩阵与对角稳定矩阵

定义了复广义正定矩阵,讨论了复广义正定矩阵与对角稳定矩阵的联系,得到了一些有用的结果。     

带有时滞的多非线性区间Lurie系统的鲁棒绝对稳定性

讨论了一类带有时滞多非线性区间系统的鲁棒绝对稳定性,通过引入区间矩阵,以及Lyapunov稳定性理论,给出了区间Lurie系统鲁棒绝对稳定性的判别条件,推广了参考文献[5]的结论.     

Lurie时滞系统绝对稳定的时滞相关条件

讨论了具有控制时滞的Lurie系统在非线性项满足有限扇形区域条件下的绝对稳定性．依据Lyapunov稳定性理论,构造一个适当的Lyapunov泛函,利用线性矩阵不等式的方法,通过一个积分不等式获得了系统绝对稳定的时滞相关条件．并应用schur补引理将以上结果推广到了具有范数有界的不确定Lurie时滞系统,得到了系统鲁棒...     

具有饱和治愈率的时滞SIR模型的稳定性分析

采用双线性发生率和饱和治愈率建立一类具有时滞的SIR传染病动力学模型,利用二代再生矩阵的方法得到模型的基本再生数R_0,分析讨论无病平衡点全局渐近稳定和地方病平衡点局部稳定的条件,并给出系统前向分支、Hopf分支的存在性条件.     

混合三次函数方程的模糊稳定性

讨论并解决了模糊Banach空间上混合三次函数方程f(x1+x2,y1+y2)+f(x1+x2,y1-y2)=2f(x1,y1)+2f(x1,y2)+2f(x2,y1)+2f(x2,y2)的Hyers-Ulam-Rassias模糊稳定性.     

任意初等行列混合变换解矩阵方程

本文从理论上讨论利用任意初等行列混合变换解系数矩阵为可逆矩阵的矩阵方程,任意初等行列混合变换解系数矩阵为一般m×n矩阵的矩阵方程,该方法系统完整.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.