共查询到18条相似文献,搜索用时 45 毫秒
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本文研究了二维保面积映象的稳定周期轨道、同周期分岔、倍周期分岔及Kolm—Jogorov熵,发现周期N轨道的失稳曲线在局部区域互相交错和打结,得到了同周期分岔条件及区分三种同周期分岔类型的解析判据,和倍周期序列分岔率及标度变换因子,对描速映象混沌程度的Kolmogorov熵也进行了计算。 相似文献
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陈尔明 《绵阳师范学院学报》2004,23(2):17-18
讨论了一类新的圆周自映射 ,证明了它是拓扑熵为零的圆周自映射。这说明了还有更多的圆周自映射 ,其拓扑熵等于零 ,从而推广了 [1][2 ]的一个结果。进而也说明了 ,圆周自映射中 ,拓扑熵为零这一条件所反映的是一种非常本质和深刻的性质。 相似文献
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In the light of Ф-mapping method and the relationship between entropy and the Euler characteristic, the intrinsic topological structure of entropy of Kerr black holes is studied. From the Ganss-Bonnet-Chem theorem, it is shown that the entropy of Kerr black hole is determined by singularities of the Killing vector field of spacetime. These singularities naturally carry topological numbers, Hopf indices and Brouwer degrees, which can also be viewed as topological quantization of entropy of Kerr black holes. Specific results S = A/4 for non-extreme Kerr black holes and S = 0 for extreme ones are calculated independently by using the above-mentioned methods. 相似文献
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本文研究了烷烃拓扑结构与标准熵的关系,得到了气态烷烃标准熵的计算公式S298.15k=49.773n 8.292lg(W 3)-11.972P 126.865(e.u.)(式中n为碳原子数,W,P为分子的拓扑参数),并说明了体系宏观性质与微观性质之间的联系。 相似文献
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In light of the Ф-mapping method,the contribution of disclination linges to the free energy density of 2-dimensional liquid crystals is studied in the single-elastic constant approximation.It is pointed out that ,compared with the previous theory ,the free energy density can be divided into two parts.One is the usual distorted energy density of director field around the disclination lines.The other is the free endrgy density of the disclination lines themselves which is centralized at the disclination lines and topoligically quantized in a unit of 1/2kπ .The topological quantum numbers are determined by the Hopf indices and Brouwer degrees of the director field at the disclination lines,i.e.,the disclination strength.From the method of Lagrangian multipliers,the equilibrium equation and the molecular field of 2-dimensional liquid crystals are also obtained.It is shown that the physical meaning of the Lagrangian multiplier is just the distorted energy density. 相似文献
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概念图在诸多领域得到广泛应用,但是在协作知识建构方面的应用比较少见。本文在分析了协作知识建构模型的基础上,从实现隐性知识向显性知识的转化、有意义学习、交流与协作三个方面探讨了概念图在协作知识建构中的应用。 相似文献
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文章在对清代安徽方志广泛阅读的基础上,分析了舆图在清代安徽方志中的采用状况,并对方志舆图的功用、绘制人员身份及资料来源、方志舆图的变化趋势进行了考察。 相似文献
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二维力学问题中,当有如ai(y)xi或bi(x)yi型的复杂荷载时,给出了如何将体积分近似转换为边界积分的方法. 相似文献
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图书流通系统“熵”稳态初探 总被引:1,自引:0,他引:1
肖润梅 《雁北师范学院学报》2001,17(3):7-8
从热力学角度看,图书流通系统是一个与外界不断交流物质,能量和信息的具有生命活力的开放系统,流通部乃至图书馆正是以“负熵”而生存的熵态系统。本用熵语言阐述了流通部如何快速有效地发挥其系统的信息功能,提高馆藏的利用率,更好地为教学科研服务。 相似文献
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在研究二维 Walsh方法的基础上 ,将其二维重叠滤波放大模板分解、简化 ,并用现场可编程门阵列 ( F PGA)实现实时图像放大 .该方法简单有效 ,放大效果好 相似文献