Results 11 to 20 of about 968 (120)
Center conditions for a simple class of quintic systems [PDF]
International Journal of Mathematics and Mathematical Sciences, Volume 29, Issue 11, Page 625-632, 2002., 2001 We obtain center conditions for a $O$-symmetric system of degree 5 for which the origin is a uniformly isochronous singular point. In the revised paper some misprints are corrected in the reference list.Comment: 9 pages, 0 figures, LaTeX 2 ...
Evgenii P. Volokitin +1 more
core +7 more sources
Bifurcation in a G0 Model of Hematological Stem Cells With Delay
Abstract and Applied AnalysisJEL Classification: 34C25, 34K18 ...
Ma Suqi, S. J. Hogan
doaj +2 more sources
Veterinary Dermatology, Volume 31, Issue 6, Page 471-e126, December 2020., 2020 Background – Equine sarcoids are the most prevalent skin neoplasm in horses worldwide. Although several treatments are available, none are consistently effective and recurrence is common. Objectives – To evaluate the efficacy and safety of topical imiquimod 5% cream and Sanguinaria canadensis + zinc chloride for treatment of equine sarcoids and ...
Carina M. Pettersson +3 more
wiley +1 more source
The monotonicity of the apsidal angle using the theory of potential oscillators [PDF]
, 2017 In a central force system the angle between two successive passages of a body through pericenters is called the apsidal angle.
Rojas, David
core +2 more sources
On Chouikha's isochronicity criterion [PDF]
, 2012 Recently A.R.Chouikha gave a new characterization of isochronicity of center at the origin for the equation $x"+g(x)=0$, where $g$ is a real smooth function defined in some neighborhood of $0 \in \R$. We describe another proof of his characterization and
Strelcyn, Jean-Marie
core +2 more sources
Localization of periodic orbits of autonomous systems based on high‐order extremum conditions
Mathematical Problems in Engineering, Volume 2004, Issue 3, Page 277-290, 2004., 2004 This paper gives localization and nonexistence conditions of periodic orbits in some subsets of the state space. Mainly, our approach is based on high‐order extremum conditions, on high‐order tangency conditions of a nonsingular solution of a polynomial system with an algebraic surface, and on some ideas related to algebraically‐dependent polynomials ...
Konstantin E. Starkov
wiley +1 more source
Discrete Dynamics in Nature and Society, Volume 2004, Issue 2, Page 325-343, 2004., 2004 The existence of positive periodic solutions for a delayed discrete predator‐prey model with Holling‐type‐III functional response N1(k+1)=N1(k)exp{b1(k)-a1(k)N1(k-[τ1])-α1(k)N1(k)N2(k)/(N12(k)+m2N22(k))}, N2(k+1)=N2(k)exp{-b2(k)+α2(k)N12(k-[τ2])/(N12(k-[τ2])+m2N22(k-[τ2]))} is established by using the coincidence degree theory.
Lin-Lin Wang, Wan-Tong Li
wiley +1 more source
On periodic‐type solutions of systems of linear ordinary differential equations
Abstract and Applied Analysis, Volume 2004, Issue 5, Page 395-406, 2004., 2004 We establish nonimprovable, in a certain sense, sufficient conditions for the existence of a unique periodic‐type solution for systems of linear ordinary differential equations.
I. Kiguradze
wiley +1 more source
Nonmonotone impulse effects in second‐order periodic boundary value problems
Abstract and Applied Analysis, Volume 2004, Issue 7, Page 577-590, 2004., 2004 We deal with the nonlinear impulsive periodic boundary value problem u″ = f(t, u, u′), u(ti+) = Ji(u(ti)), u′(ti+) = Mi(u′(ti)), i = 1, 2, …, m, u(0) = u(T), u′(0) = u′(T). We establish the existence results which rely on the presence of a well‐ordered pair (σ1, σ2) of lower/upper functions (σ1 ≤ σ2 on [0, T]) associated with the problem.
Irena Rachůnková, Milan Tvrdý
wiley +1 more source
Well-Ordered and Non-Well-Ordered Lower and Upper Solutions for Periodic Planar Systems
Advanced Nonlinear Studies, 2021 The aim of this paper is to extend the theory of lower and upper solutions to the periodic problem associated with planar systems of differential equations.
Fonda Alessandro +2 more
doaj +1 more source