共查询到20条相似文献，搜索用时 109 毫秒
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一、混沌理论简介“Chaos”一词来自希腊文“Xaos”,原意是指先于一切事物而存在的虚旷的空间。现在混沌指确定性系统中的内随机性运动状态,表述大量非线性系统中所观察到的非周期、不规则、不可预测和随机性的行为。混沌理论研究的对象是通常看起来混乱无序的现象,混沌理论认为:表面上看来杂乱无序的系统,实际上有它自身的规律。混沌作为确定性非线性动力系统的重要特征已经引起了人们的广泛关注,已经开始在 相似文献
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历史决定论是历史哲学的一个重要议题，受到了相当的关注。从20世纪以来，它也成了批判的焦点。20世纪末兴起的复杂性理论特别是混沌理论为我们分析历史决定论提供了科学的方法和依据。我们可以根据复杂性的观点，从历史方法论、历史规律观和历史预测观三方面对历史决定论进行更加科学的分析，并对历史决定论和反决定论进行更加客观和深刻的批判。 相似文献
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构造了一组广义符号动力系统中的Li-Yorke混沌集,从混沌集的角度描述了广义符号动力系统的动力性状,同时讨论了有限符号动力系统和广义符号动力系统中混沌集的关系． 相似文献
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马莉 《兰州石化职业技术学院学报》2011,11(4):29-31
在一类含间隙多自由度动力系统的力学模型的基础上,根据系统在无碰撞情况下的无量纲微分方程和相应的无量纲冲击方程,利用龙格一库塔数值仿真方法揭示了系统存在复杂的混沌运动行为。理论分析了延迟反馈方法对混沌控制的有效性,相图和时间历程图均表明该方法能将系统的混沌行为有效地控制到周期轨道。 相似文献
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主要研究了一类二维离散动力系统(2-D),即带强迫项对流系统的空间混沌行为,介绍了连续对流系统在Li-Yorkc和Marotto意义下的空间混沌定义以及非连续对流系统(分段连续对流系统)在转数区间意义下的空间混沌定义,并且分析了它的空间混沌的存在性. 相似文献
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《赤峰学院学报(自然科学版)》2016,(6)
混沌属于动力系统的范畴的概念,其作用是用来描述系统的复杂程度,本文介绍了动力系统中的Li-Yorke混沌和Devaney混沌,以及周期点,回复点的概念,之后便讨论了当动力系统拓扑传递时,初值敏感依赖性的条件. 相似文献
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降水酸度时间序列的确定性混沌 总被引：1，自引：0，他引：1
基于非线性动力系统理论与方法研究了常德市降水酸度月均值序列的确定性混沌特征，并与美国佛罗里达州降水酸度月均值序列进行了比较．结果表明，降水酸度月均值序列的变化既不是确定性的，也不是随机性的，而是混沌的．以Grassberger-Procaccia算法计算表明，降水酸度演变存在奇异吸引子，且两序列吸引子的关联维数D2分别为3．89及4．73，重构相空间的嵌入维数M必须分别满足5≤M≤14及6≤M≤14才能较好地描述或预测系统的演化状态． 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,(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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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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《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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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 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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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献