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排序方式: 共有117条查询结果,搜索用时 31 毫秒
101.
The state space for an infinite-dimensional system of the form = Ax + Bu can be extended to the dual of a countably Hilbertainspace with graph toplogy. The Study of countably Hilbertianspaces with graph topology and their duals is made. The structuresof the extensions of a C0 semigroup and the stability theoryof the restrictions and extensions of the semigroup are illustrated.An existence and uniqueness theorem of the solution of the extendedsystem is given. 相似文献
102.
The main purpose of this paper is to examine the existence of coupled solutions and coupled minimal-maximal solutions for a kind of nonlinear operator equations in partial ordered linear topology space... 相似文献
103.
Global asymptotic stability analysis for neutral stochastic neural networks with time-varying delays
Weiwei Su Yiming Chen 《Communications in Nonlinear Science & Numerical Simulation》2009,14(4):1576-1581
In this paper, the global asymptotic stability is investigated for a class of neutral stochastic neural networks with time-varying delays and norm-bounded uncertainties. Based on Lyapunov stability theory and stochastic analysis approaches, delay-dependent criteria are derived to ensure the global, robust, asymptotic stability of the addressed system in the mean square for all admissible parameter uncertainties. The criteria can be checked easily by the LMI Control Toolbox in Matlab. A numerical example is given to illustrate the feasibility and effectiveness of the results. 相似文献
104.
一类带有非线性传染率的SEIS传染病模型的定性分析 总被引:4,自引:0,他引:4
借助极限理论和Fonda定理,研究了一类既有常数输入率又有因病死亡率的SEIS传染病模型.所考虑模型的传染率是非线性的,并且得到了该模型的基本再生数,当基本再生数小于1时,该模型仅存在唯一的无病平衡点,它是全局渐近稳定的,且疾病最终灭绝.当基本再生数大于1时,该模型除存在不稳定的无病平衡点外,还存在唯一的局部渐近稳定的地方病平衡点,并且疾病一致持续存在. 相似文献
105.
In this paper, we study the uniqueness and existence of fixed points of mixed monotone operators in the partially ordered Banach space. Our conclusions essentially improve the relevant results obtained by Liang and others. Moreover, as an application of our results, we prove the existence and uniqueness of a positive solution for a class of integral equations which cannot be solved by using previously available methods. 相似文献
106.
在一些相关文件的基础上构建了循环经济评价的指标体系,为循环经济评价提供了综合的数学模型.运用该模型对2010年山西省11个地级市的循环经济发展水平作了测算分析. 相似文献
107.
熵权法在水资源可持续利用评价中的应用 总被引:1,自引:0,他引:1
介绍了熵权基本理论,将熵权评价法应用于山西省11个市水资源可持续利用中,并对山西省11个市的水资源可持续利用情况进行了排序.实例研究表明,熵权法在确定评价指标方面克服了人为主观性对评价过程的干扰,提高了评价的科学性. 相似文献
108.
《Communications in Nonlinear Science & Numerical Simulation》2014,19(7):2212-2219
In this paper, we study conservation laws for some partial differential equations. It is shown that interesting conserved quantities arise from multipliers by using homotopy operator that is a powerful algorithmic tool. Furthermore, the invariance properties of the conserved flows with respect to the Lie point symmetry generators are investigated via the symmetry action on the multipliers. Furthermore, the similarity reductions and some exact solutions are provided. 相似文献
109.
Xiao Zhang Ling Guo Jian Guo Ning-Ning Ren 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(3):457-465
The binding energy, dissociation energy, ionization potentials, electron affinities, gap and stability of small Al n Pt (n = 1–15) clusters, in comparison with pure aluminum clusters have been systematically investigated by means of density functional calculations at the B3LYP level. The growth patten for Al n Pt clusters is that the Pt atom substituted the surface atom of the Al n + 1 clusters for n < 13. Starting from n = 13, the Pt atom completely falls into the center of the Al-frame. The Pt atom substituted the center atom of the Al n + 1 clusters to form the Pt-encapsulated Aln geometries for n > 13. We also find that the impurity Pt atom causes local structural distortion due to different atomic radii and different bonding characteristics. The clusters with total atom numbers of 2, 7, and 11 exhibit high stability. 相似文献
110.