Results 141 to 150 of about 35,466 (285)
Codimension two and three bifurcations of a predator–prey system with group defense and prey refuge
Nonlinear Analysis, 2015 A predator–prey system with nonmonotonic functional response and prey refuge is considered. We mainly obtain that the system has the bifurcations of cusp-type codimension two and three, these illustrate that the dynamic behaviors of the model with prey ...
Xia Liu, Jinling Wang
doaj +1 more source
Time Delay Effect on the Love Dynamical Model [PDF]
, 2011 We investigate the effect of time delay on the dynamical model of love. The local stability analysis proves that the time delay on the return function can cause a Hopf bifurcation and a cyclic love dynamics. The condition for the occurrence of the Hopf bifurcation is also clarified.
arxiv +1 more source
Asymptotics of Dynamical Saddle-node Bifurcations
Nelineinaya Dinamika, 2022 Dynamical bifurcations occur in one-parameter families of dynamical systems, when the parameter is slow time. In this paper we consider a system of two nonlinear differential equations with slowly varying right-hand sides. We study the dynamical saddle-node bifurcations that occur at a critical instant.
openaire +1 more source
The neodiapsid Thadeosaurus colcanapi from the upper Permian of Madagascar
Papers in Palaeontology, Volume 11, Issue 2, March/April 2025.Abstract The enigmatic neodiapsid Thadeosaurus colcanapi (Lower Sakamena Formation, southwestern Madagascar), sole species of the genus Thadeosaurus, is revised here. The attribution of 12 of the 21 referred specimens is confirmed, spanning all ontogenetic stages, and the anatomy of Thadeosaurus is redescribed in detail with comments on ontogenetical ...
Valentin Buffa +3 more
wiley +1 more source
Turing-Hopf bifurcation and spatio-temporal patterns of a ratio-dependent Holling-Tanner system with diffusion [PDF]
, 2017 A diffusive ratio-dependent Holling-Tanner system subject to Neumann boundary conditions is considered. The existence of multiple bifurcations, including Turing-Hopf bifurcation, Turing-Truing bifurcation, Hopf-double-Turing bifurcation and triple-Turing bifurcation, are given.
arxiv +1 more source
Earth and Space Science, Volume 12, Issue 3, March 2025.Abstract This study characterizes fluvial activity on Alba Mons using a combination of image and topographic data to inform photogeologic interpretation and hydrological modeling. We produced a comprehensive digital inventory of fluvial valleys that documents the extensive dendritic and parallel drainage patterns dissecting Early Amazonian volcanic ...
Stephen P. Scheidt +2 more
wiley +1 more source
A finding of the maximal saddle-node bifurcation for systems of differential equations
Journal of Differential Equations, 2023 A variational method is presented for directly finding the bifurcation point of nonlinear equations as the saddle-node point of the extended nonlinear Rayleigh quotient. The method is applied for solving an open problem on the existence of a maximal saddle-node bifurcation point for set of positive solutions of system equations with convex-concave type
openaire +2 more sources
Mathematical Methods in the Applied Sciences, Volume 48, Issue 3, Page 2999-3021, February 2025.In this paper, we have formulated and analyzed a mathematical model with multiple time delays of the genetic regulatory network of the microRNA‐17‐92 (miR‐17‐92) cluster. We have focused on the effect of the associated transcriptional and translational time delays of both positive and negative feedback loops on the miR‐17‐92 regulatory network. To gain
Akshay Sharma +2 more
wiley +1 more source
Bifurcation analysis of a discrete SIS model with bilinear incidence depending on new infection
Mathematical Biosciences and Engineering, 2013 A discrete SIS epidemic model with the bilinear incidence depending on the new infection is formulated and studied.The condition for the global stability of the disease free equilibrium is obtained.The existence of the endemic equilibrium and its ...
Hui Cao, Yicang Zhou, Zhien Ma
doaj +1 more source
Local Bifurcations in DC-DC Converters [PDF]
arXiv, 2012 Three local bifurcations in DC-DC converters are reviewed. They are period-doubling bifurcation, saddle-node bifurcation, and Neimark bifurcation. A general sampled-data model is employed to study the types of loss of stability of the nominal (periodic) solution and their connection with local bifurcations.
arxiv