共查询到20条相似文献，搜索用时 62 毫秒
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一个新的混沌系统的设计及其电路实验验证 总被引：1，自引：1，他引：0
构造了一个新的混沌系统,并对该系统的耗散性、平衡点的稳定性、Lyapunov指数和分岔图等基本动力学特性进行了分析.通过计算机仿真观察到了该系统的混沌现象,设计了实现该系统模拟电路,并提出一种确定此类电路元件参数的计算方法.电路实验结果与动力学特性分析、数值仿真完全相符,验证了系统的混沌行为. 相似文献
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构造了一类新含有指数项的连续自治混沌系统,该系统含有三个参数以及两个非线性项.对系统的平衡点的稳定性进行了分析,并利用Matlab分析系统的分岔图、Lyapunov指数,庞加莱截面,从而表明新混沌系统对系统参数的敏感性.研究结论证实了揭示系统具有丰富的动力学特性以及混沌系统的可实现性. 相似文献
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一类新的混沌系统及其混沌控制 总被引：1，自引：0，他引：1
构造了一个新的三维自治混沌系统,该系统含有四个参数,三个非线性项.通过理论分析和相轨迹图、分岔图、Lyapunov指数谱等非线性动力学分析方法研究了系统的非线性动力学行为.最后运用线性反馈控制法对新混沌系统进行控制,将混沌轨道控制到稳定的周期轨道,并给出了数值仿真结果,证实了所设计的线性反馈控制器的有效性. 相似文献
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在Lorenz系统族里构造了一个新的混沌系统;依据非线性动力学系统的分析方法,对这个新的混沌系统进行了理论分析;基于模拟电路初始状态高度随机的特点,采用模块化混沌电路的设计思路,对新混沌系统进行了实际电路验证;利用EWB软件,对新混沌电路的电磁特性进行了仿真验证. 相似文献
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基于FPGA的一个超混沌Lorenz系统设计与实现 总被引：1，自引：1，他引：0
在变形的Lorenz系统的基础上,提出了一个新的四维超混沌系统,并通过理论分析和数值仿真对该系统的基本动力学特性进行了深入研究,得到了该系统的Lyapunov指数谱和Lyapunov维数,还设计了一个数字电路进行实验,从电路实验中观察到了各种超混沌吸引子. 相似文献
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针对一类新构造的三维混沌系统,对系统平衡点的稳定性进行分析,并利用分岔图与Lyapunov指数等进行数值仿真.同时运用Multisim软件设计此类系统的混沌电路,最后基于Lyapunov稳定性理论,设计自适应控制器,实现系统的混沌同步.仿真结果验证所提出同步方法的有效性和可实现性.以及对研究该系统应用提供了理论参考. 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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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. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献