共查询到20条相似文献，搜索用时 984 毫秒
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赵国求 《武汉工程职业技术学院学报》2005,17(3):49-56,87
道是一切物质运动和规律的总和,阴阳是量度系统稳定性的状态参量,在四季、昼夜、人生中均可应用."无"中生"有",关键在于"生",在于物质间的相互作用. 相似文献
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王立明 《廊坊师范学院学报(自然科学版)》2009,9(4):56-59
对“旋转单摆”的运动进行研究,建立系统的动力学方程,用线性稳定性分析方法讨论平衡点附近邻域的稳定性,给出了系统静态分岔图和运动的相图,利用Jacobi椭圆函数得出不同转速下系统作周期运动的解析解,并绘出图形加以说明。 相似文献
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提出了多重共振发生的条件,给出了约化后多重共振系统稳态运动方程的形式,并应用牛顿下山法或梯度法求解约化后多重共振系统稳态运动方程(组)。根据多重共振系统稳态运动解的稳定性判定定理和对应的雅克比矩阵的特点,采用求解一般实矩阵全部特征值的QR方法判断多重共振系统稳态运动解的稳定性,并给出了应用实例。 相似文献
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一力学系统,在给定了力与初始条件后,按(?)力学定律就应该发生某一确定的运动。但这个运动是否能实际发生或发生后能持续多久,则要在进行运动稳定性分析后才能确定。所谓运动稳定性,是指:一力学系统在t时刻,其坐标、速度受到某种微扰而偏离原轨道,在t以后的时间内,如果该系统: 1.仍能回到原轨道或始终保持在原轨道附近运动(如相对于原轨道作简谐运动等),则我们认为该系统所作的运动是稳定的。 2.逐渐偏离原轨道,以致其轨道运动特征消失,则该系统所作的运动就是不稳定的。 相似文献
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<正> 变系数动力系统运动稳定性是现代化生产中急待解决的一个课题,我国有不少学者正从事于这一课题的研究〔1—4〕,美国Lefschetz动力研究中心仍然把变系数线性系统的运动稳定性作为重要的研究项目之一。文〔3〕利用分解理论研究了缓变系统与子系统呈对称型的大系统的稳定性。本文放宽了对子系统为对称及缓变的要求,沿用分解理论研究了一类仿拟反对称系统平凡解的稳定性。 相似文献
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毛泽东领导"三反"运动的艺术特色浸透在"三反"运动的整个过程之中,突出表现为四个系统整合.即,自上而下与自下而上的"三反"斗争的系统整合;内部"三反"斗争与其外部"五反"斗争的系统整合;放手发动群众与严密控制群众运动的系统整合;开展"三反"运动与不误生产建设的系统整合.正是这四个决策化的系统整合所具有的巨大内涵力,保证了"三反"运动的全力开展和系统、健康地进行,并取得实效. 相似文献
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建立了受约束的广义Birkhoff系统的运动方程,求出系统的平衡位置,并在平衡位置处建立受约束的广义Birkhoff系统的受扰运动方程,根据Lyapnnov一次近似理论和直接法来判定受约束的广义Birkhoff系统的平衡稳定性。举例说明它的应用。 相似文献
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本文建立了一类两自由度变碰撞面的碰撞振动系统动力学模型,获得了系统的周期响应,推导出系统n-1周期运动的四维Poincaré映射。利用Poincaré映射方法,对系统单碰撞周期运动的稳定性与分岔进行分析,分析了系统n-1周期运动的Hopf分岔、周期倍化分岔及强共振情况下的亚谐分岔,研究了当分岔参数变化时碰撞振动系统由概周期碰撞运动向混沌运动的演化过程,为冲击振动系统的优化设计提供了理论依据。 相似文献
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研究了可控随机非完整Hamilton系统的矩稳定性的条件，通过恰当地选择控制参量u，从而使系统满足稳定性条件，首先，给出可控随机非完整Hamilton系统的运动方程和平衡方程，然后，讨论了可控随机非完整Hamilton系统的均值稳定性的条件。 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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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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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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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