混沌理论与创新探讨

本文从复杂性研究出发,引出混沌理论研究的背景及其发展。介绍了混沌的定义、混沌的特征及走向混沌的途径。重点研究了混沌与企业管理的结合,特别是如何在混沌的边界实现创新。     

统一混沌系统的控制与同步的研究进展

统一混沌系统是新近发现的混沌系统,它联系了Lorenz系统和Chen系统。统一混沌系统的发现为混沌控制与同步的研究提供了又一个新模型。文章概述了统一混沌系统的最新研究进展:统一混沌系统的稳定化、超混沌化控制;统一混沌系统的同步方法;以及基于该系统的应用研究。最后指出了统一混沌系统需要进一步研究的问题和应用前景。     

超混沌与保密通讯

阐明混沌与超混沌的主要区别,明确提出超混沌比混沌更适用于保密通讯的新观点     

混沌信号对通信系统攻击方法的研究

设想把混沌理论应用到电子对抗中,提出混沌信号干扰攻击敌方通信系统思想方法,提出混沌屏蔽攻击方法.混沌屏蔽攻击的物理机制是:强混沌信号可以直接屏蔽信息信号,小混沌信号可以扰乱信息信号.还发现联合混沌信号和噪声信号其攻击效果确能增加了通信系统的解调难度.     

混沌电路综合设计性实验教学平台的开发

综合设计性物理实验是当前实验教学的研究热点。针对综合设计性物理实验,开发一套基于Matlab的混沌电路实验教学平台。该平台主要有三大功能：1.提供经典混沌方程库,可观察和分析方程的混沌吸引子、Lyapunov指数、分岔图等特性;2.提供设计混沌方程和设计参数的窗口,可设计混沌系统吸引域和功率谱范围的大小以及旋转对称性等,以实现自主设计混沌模型;3.提供方程处于混沌状态时的参考电路及电路参数,为混沌模型电路实现提供可行方案。利用混沌电路实验教学平台,可开展从混沌现象观察到混沌模型设计再到混沌模型实现的阶梯性、探索性实验教学,为综合设计性物理实验教学提供一种新的模式。     

基于混沌控制的高校课堂教学管理方法研究

当前高等教育教学改革对课堂教学管理提出了新要求,本文阐述了混沌理论的特点及混沌控制和混沌反控制的原理,分析了混沌控制和混沌反控制在高校课堂教学管理中的应用,以期为高校课堂教学管理方法的改革提供有益的参考。     

混沌的本质

以罗仑兹 (Lorenz)系统及Logistic映射为例 ,阐述了混沌系统、混沌本质、通向混沌的道路及混沌系统中的秩序。     

混沌振动工程应用现状综述

概述了混沌现象以及混沌研究的意义,探讨了通向混沌的道路和混沌在工程方面的应用,并展望了它们的发展前景。     

掺铒光纤激光器混沌同步实验研究

激光混沌信号的宽带、随机和不可预测性,使其具有天然的屏蔽性和保密能力,成为保密通信的优选光源。混沌同步作为混沌通信的基础,是混沌通信的研究热点。基于长腔的混沌光纤激光器,实验研究掺铒光纤放大器输出的混沌激光与光纤激光器的同步特性。结果表明：通过改变偏振控制器和泵浦电流,混沌光纤激光器与掺铒放大器在很大的范围内具有同步特性。     

混沌调制对改善直流变换器电磁兼容性的研究及仿真

混沌信号具有类随机、连续频谱的特性,混沌调制用于直流开关变换器可以扩展频谱,抑制电磁干扰（EMI）。但实际产生的混沌信号频谱具有一定的范围,如由蔡氏电路产生的模拟混沌信号,具有一个特殊频率并以之为中心左右基本对称的频谱范围,这个频率为中心频率并由电路的实际参数所决定。本文以BUCK变换器为例,采用外接蔡氏电路作为模拟混沌信号发生器,分别选用合适中心频率的混沌信号,实施混沌化占空比和混沌化频率的方案,通过计算机仿真结果进行对比,验证了混沌调制具有改善电磁兼容（EMC）的性能,且混沌化频率的方案抑制EMI效果更明显。     

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,     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

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.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

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.