A method is proposed for synthesizing output feedback controllers for nonlinear Lur' e systems. The problem of designing an output dynamic controller for un
The time periodic solution problem of damped generalized coupled nonlinear wave equations with periodic boundary condition was studied. By using the Galerkin me
<正> 屈原的《天问》是一首奇特而玮丽的哲理诗。它的一百七十多个问题就象一百七十多个理性的闸门,情感的滤箱,任何传统的社会、政治、伦理、历史、神话、传说的事件和观念,都要通过作者批判和怀疑的审查、过滤、筛选、淘汰,才汇成巨流,涌上笔端,著之竹帛,激起浪花,蔚为形象,传流久远,动人心弦,新人耳目,发人深思。它是时代批判的
The controllability for switched linear system with time-delay in controls was first investigated. The whole work contains three parts. This is the first part,
The existing various couple stress theories have been carefully restudied. Thepurpose is to propose a coupled Noether's theorem and to reestablish rather co
The purpose is to reestablish rather complete basic balance equations and boundary conditions for polar thermomechanical continua based on the restudy of the tr
如果让安全研究者评选在客户端方面最火热的攻防焦点，至少有1/3以上的人会选择浏览器，而3月则颇有一些火上浇油的味道。
<正> 杜甫是我国唐代伟大的现实主义诗人。他的诗歌揭露了封建统治者的穷奢极欲,荒淫腐朽,对他们作了严厉的斥责,反映了劳动人民的悲惨生活,对他们表示了深切的同情,全面地反映了安史之乱:对安史发动的危害中央集权的割据分裂战争表示了严厉的谴责,对战争的进展表示了极大的关注,对封建统治者的无能和不顾人民死活作了批判;使他的诗歌成为中唐社会的一面镜子,获得“诗史”的称誉。这些就是杜甫诗歌的重要成就,是杜甫现实主义诗歌的精华所在。
<正> 杂文是我国一种传统的文学样式。早在百家争鸣的战国时期,它就作为散文家族中的一员而载入古籍,所以鲁迅在《且介亭杂文序言》里说:“其实‘杂文’也不是现在的新货色,是‘古已有之’的。”它象一簇秀色可观、锋芒可扪的刺玫瑰,曾经沐浴着时代的雨露,植根于现实的土壤,凌霜斗雪,笑傲苍穹,以其独有的风姿开放在我国姹紫嫣红的古代文苑中。