期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
多涡卷超混沌系统的设计与性能分析 被引量:3
1
作者 孙克辉 艾星星 贺少波 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2015年第5期1663-1672,共10页
为了设计性能优越的多涡卷超混沌系统,采用理论分析和数值仿真方法,通过设计一个连续的非线性函数,得到了6阶超混沌系统的单方向与网格多涡卷吸引子模型。通过吸引子相图、Lyapunov指数谱、分岔图、Poincaré截面和复杂度等,分析了... 为了设计性能优越的多涡卷超混沌系统,采用理论分析和数值仿真方法,通过设计一个连续的非线性函数,得到了6阶超混沌系统的单方向与网格多涡卷吸引子模型。通过吸引子相图、Lyapunov指数谱、分岔图、Poincaré截面和复杂度等,分析了多涡卷超混沌系统的动力学特性。研究结果表明:多涡卷超混沌吸引子具有丰富的动力学特性,仿真结果与理论分析结果一致,表明了多涡卷超混沌系统设计方法的有效性和设计模型的正确性。 展开更多
关键词 超混沌吸引子 多涡卷吸引子 连续非线性函数 动力学特性
下载PDF
一个新四翼忆阻混沌系统的设计与性能分析 被引量:1
2
作者 雷宇 《电子技术与软件工程》 2018年第24期57-58,共2页
将一个基于双曲函数的非线性函数应用于三次磁控忆阻混沌系统得到一个四翼吸引子混沌系统,通过吸引子相图、lyapunov指数分析表明,该多翼混沌吸引子具有更丰富,更复杂的动力学特征,仿真结果和理论计算一致,为新的混沌电路的设计提供了... 将一个基于双曲函数的非线性函数应用于三次磁控忆阻混沌系统得到一个四翼吸引子混沌系统,通过吸引子相图、lyapunov指数分析表明,该多翼混沌吸引子具有更丰富,更复杂的动力学特征,仿真结果和理论计算一致,为新的混沌电路的设计提供了一种思路。 展开更多
关键词 连续非线性函数 忆阻混沌系统 混沌吸引子 LYAPUNOV指数
下载PDF
结合àtrous算法与Retinex算法的医学图像增强 被引量:4
3
作者 黄允浒 吐尔洪江.阿布都克力木 +2 位作者 刘芳园 王鑫 张鹏杰 《数学的实践与认识》 北大核心 2017年第9期198-203,共6页
提出结合àtrous算法与Retinex算法的医学图像增强.方法在二进小波理论基础上,利用推广的二维àtrous算法对医学图像进行处理,对经过多级分解后的医学图像的低频利用连续非线性函数增强,而对分解后的多个高频采用改进的Retinex... 提出结合àtrous算法与Retinex算法的医学图像增强.方法在二进小波理论基础上,利用推广的二维àtrous算法对医学图像进行处理,对经过多级分解后的医学图像的低频利用连续非线性函数增强,而对分解后的多个高频采用改进的Retinex算法进行增强;最后,对增强后的低频和高频进行重构.经过反复仿真试验结果表明:方法在去除噪声的同时更好地保留了图像边缘特征,增强了图像细节信息和凸显图像的轮廓,并克服对比度下降的不足,较好地去除光晕现象,视觉效果好,层次感更丰富. 展开更多
关键词 二进小波 二维àtrous算法 分解与重构 RETINEX算法 连续非线性函数
原文传递
OSCILLATION OF A FORCED SECOND ORDER NONLINEAR EQUATION
4
作者 KONGQINGKAI ZHANGBINGGEN 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 1994年第1期59-68,共10页
This paper gives several criteria on the oscillatory behavior of solutions of the forced secondorder equation x″+ a(t)i(x) = g(t), where g(t) is oscillatory) by using a geometric idea. Asspecial cases these results i... This paper gives several criteria on the oscillatory behavior of solutions of the forced secondorder equation x″+ a(t)i(x) = g(t), where g(t) is oscillatory) by using a geometric idea. Asspecial cases these results include and improve some recent results, given by J. S. Wong. Thecriteria also solve the problem posed by H. Onose in Mathematical Reviews, 1986. 展开更多
关键词 OSCILLATION FORCED Nonlinear Differential equations.
原文传递
Existence and Global Asymptotic Behavior of Positive Solutions for Sublinear and Superlinear Fractional Boundary Value Problems
5
作者 Imed BACHAR Habib MAAGLI +1 位作者 Faten TOUMI Zagharide ZINE EL ABIDINE 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2016年第1期1-28,共28页
In this paper, the authors aim at proving two existence results of fractional differential boundary value problems of the form (Pa,bα){D^au(x)+f(x,u(x))=0,x∈(0,1),u(0)=u(1)=0,D^a-3u(0)=a,u^(1)=-6w... In this paper, the authors aim at proving two existence results of fractional differential boundary value problems of the form (Pa,bα){D^au(x)+f(x,u(x))=0,x∈(0,1),u(0)=u(1)=0,D^a-3u(0)=a,u^(1)=-6where 3 ≤ a 〈 4, D^ is the standard Riemann-Liouville fractional derivative and a, b are nonnegative constants. First the authors suppose that f(x, t) = -p(x)t^σ, with cr ~ (-1, 1) and p being a nonnegative continuous function that may be singular at x - 0 or x - 1 and satisfies some conditions related to the Karamata regular variation theory. Combining sharp estimates on some potential functions and the Sch^uder fixed point theorem, the authors prove the existence of a unique positive continuous solution to problem (P0,0). Global estimates on such a solution are also obtained. To state the second existence result, the authors assume that a, b are nonnegative constants such that a + b 〉 0 and f(x, t) -= tφ(x, t), with φ(x, t) being a nonnegative continuous function in (0, 1) × [0, ∞) that is required to satisfy some suitable integrability condition. Using estimates on the Green's function and a perturbation argument, the authors prove the existence and uniqueness of a positive continuous solution u to problem (Pa,b), which behaves like the unique solution of the homogeneous problem corresponding the existence results. to (Pa,b). Some examples are given to illustrate the existence results., 展开更多
关键词 Fractional differential equation Positive solution Fractional Green's function Karamata function Perturbation arguments Sch/iuder fixad point theorem
原文传递
Existence and concentration behavior of sign-changing solutions for quasilinear Schr?dinger equations equations
6
作者 DENG YinBin SHUAI Wei 《Science China Mathematics》 SCIE CSCD 2016年第6期1095-1112,共18页
We consider the quasilinear Schrdinger equations of the form-ε~2?u + V(x)u- ε~2?(u2)u = g(u), x ∈ R^N,where ε 〉 0 is a small parameter, the nonlinearity g(u) ∈ C^1(R) is an odd function with subcrit... We consider the quasilinear Schrdinger equations of the form-ε~2?u + V(x)u- ε~2?(u2)u = g(u), x ∈ R^N,where ε 〉 0 is a small parameter, the nonlinearity g(u) ∈ C^1(R) is an odd function with subcritical growth and V(x) is a positive Hlder continuous function which is bounded from below, away from zero, and infΛV(x) 0 such that for all ε∈(0, ε0],the above mentioned problem possesses a sign-changing solution uε which exhibits concentration profile around the local minimum point of V(x) as ε→ 0~+. 展开更多
关键词 sign-changing solution quasilinear Schr6dinger equations concentration profile
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部