共查询到20条相似文献,搜索用时 31 毫秒
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利用断片的性质,改进了齐恩凤,齐登记等的研究结果,得到了收缩临界6-连通图中6度点的性质的新结果:设x是G中任意一点,设A是一个x-原子,记N_A=T_A,N(x)∩T_A≠Φ,则A∩T_A中有与x相邻的6度点或两点的距离为2. 相似文献
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对于给定的图日,若可图序列π有一个实现G以H为其子图,则称π为蕴含日一可图的.在本文,作者刻划了蕴含K6-Z6-可图序列. 相似文献
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题 1 (2 0 0 2年广州市高三测试题 )已知椭圆 C的中心在原点 ,焦点在 x轴上 ,离心率 e= 12 ,且经过点 M(- 1 ,32 ) .( )求椭圆 C的方程 :( )若椭圆 C上有两个不同点 P、Q关于直线 y =4x m对称 ,求 m的取值范围 .命题溯源 此题根据 1 986年广东省高考试卷末题改编而成 ,主要考查学生求曲线方程、直线与圆锥曲线的位置关系 ,以及综合运用数学知识解决问题的能力 .原解思路 ( )依题意 ,设椭圆的方程为 x2a2 y2b2 =1 (a >b >0 ) ,则1a2 94b2 =1 ,ca =12 ,a2 - b2 =c2 .解得 a =2 ,b =3 ,c =1 .∴ 椭圆 C的方程为 x24 y23 =… 相似文献
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This paper describes a procedure for identifying geometric and stiffness parameters of a mechanical serial chain of know structure by measuring spatial 6×6 stiffness matrices at different positions. The method uses standard optimization routines to determine model parameters such that the model stiffness matrix features in the Frobenius norm the closest distance possible to the measured matrix. From this local identification, a rough model of parameters of finite-motion is created, from which new measuring positions are guessed. By applying this step repeatedly, a model for finite-displacement parameters can be obtained by a sequence of small force-displacement tests. The method is tested with a dummy device consisting of a revolute joint connecting two rigid links dressed with soft material to mimic for example muscle masses of a surrogate mechanism for the elbow joint of a human arm. Two robots grasping the upper and lower arm generate the motion while the force measurement is carried out by a six-axis force sensor. This makes the method potentially suitable for detecting anatomical parameters by in-vivo measurements. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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《应用数学与计算数学学报》2016,(3)
以切比雪夫偏差点为插值点,利用切比雪夫多项式逼近理论和高斯-洛巴托-切比雪夫求积公式,构造了一个6级6阶的隐式Runge-Kutta方法.理论分析发现,该算法具有良好的稳定性——A_0稳定,较大α值的A(α)稳定,较小D值的刚性稳定和几乎L稳定.数值算例显示了该算法的有效性. 相似文献
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