共查询到20条相似文献，搜索用时 421 毫秒
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该文用李雅普诺夫(Liapunov)的第二方法分析了一类三阶非线性微分系统(x) ψ(x)f((x)) g((x)) h(x)=0(1)零解的稳定性.在常系数线性系统的李雅普诺夫函数的基础上,通过变换找到该系统的等价线性系统,采用线性类比的方法构造出合适的李雅普诺夫函数,从而得出了这个系统的零解是渐近稳定的一组充分条件. 相似文献
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郭喜荣 《吉林广播电视大学学报》2017,(12):125-126
考虑二阶线性系统的零解的稳定性,本文导出了二阶线性系统的李雅普诺夫函数的构造,讨论对于选取不同的李雅普诺夫函数对判断系统的零解稳定性结论的影响,并得到对于不同的李雅普诺夫函数在判断二阶线性系统的零解的稳定性结论上是一致的。 相似文献
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在线性系统李雅普诺夫函数的基础上,运用"类比法"讨论了一类四阶非线性系统李雅普诺夫函数的构造,并给出了该系统平凡解稳定的充分条件. 相似文献
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一类三阶非线性系统的全局渐近稳定性 总被引：1，自引：0，他引：1
本文利用能量度量算法构造了三阶非线性系统(x...) a(x¨) b(x.) f(x)＝0(其中f(0)＝0)的李雅普诺夫函数,从而研究了它零解的全局渐近稳定性. 相似文献
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微分方程解的稳定性研究中最为常用的是李雅普诺夫第二法(直接法),利用这种方法研究系统的解的稳定性,其关键就是构造李雅普诺夫函数,即V函数.本文目的在于分析、总结系统稳定性的李雅普诺夫第二法的相关理论,以及如何借助李雅普诺夫函数来判断系统的稳定性.在Lotka-Voltera模型和流行病模型(SIR模型和SI模型)中,通过构造李雅普诺夫函数(一个与ln有关的函数),并借助李雅普诺夫函数及导数的符号特征,直接判断系统模型在平衡状态下的稳定性. 相似文献
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于霞 《南通职业大学学报》2010,24(2):70-71
利用类比法构造了一类三阶非线性系统的李雅普诺夫函数,得出了该系统零解稳定的充分条件,解决了相当广泛的一类三阶非线性系统的零解稳定性问题。 相似文献
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本文用能量度量算法构造了一类三阶非线性系统的李雅普诺夫函数,从而研究了它们零解的全局渐近稳定性． 相似文献
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本文首先导出五维 数线性系统的李雅普诺夫函数公式，并在此基础上，分析一类五阶线性系统的李雅普若夫函数的构造。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
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. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
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. 相似文献
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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. 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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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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