Results 81 to 90 of about 25,747 (262)

Two new species of stone loaches of the genus Barbatula (Cypriniformes: Nemacheilidae) from Europe with a neotype designation of B. barbatula (Teleostei: Nemacheilidae)

Journal of Fish Biology, EarlyView.
Abstract Ten species of Barbatula are recognised in Europe, west of the Urals: B. barbatula, B. caucasica, B. hispanica, B. leoparda, B. pironae, B. quignardi, B. sturanyi, B. taurica, B. vardarensis and B. zetensis, with B. caucasica and B. taurica formerly considered subspecies of B. barbatula.
Bárbara B. Calegari, Jörg Freyhof, Conor Waldock, Bernhard Wegscheider, Dario Josi, Lukas Rüber, Ole Seehausen   +6 more
wiley   +1 more source

Scaling in activated escape of underdamped systems

, 2005
Noise-induced escape from a metastable state of a dynamical system is studied close to a saddle-node bifurcation point, but in the region where the system remains underdamped.
A. P. Dmitriev, A. P. Dmitriev, H. Kramers, I. B. Schwartz, J. Guckenheimer, L. D. Landau, M. I. Dykman, M. I. Dykman, M. I. Dykman, M. Shapiro, V. Arnold   +10 more
core   +1 more source

Backward bifurcation and saddle-node bifurcation in virus-immune dynamics

, 2021
Recently, Wang and Xu [ Appl. Math. Lett. 78 (2018) 105-111] studied thresholds and bi-stability in virus-immune dynamics. In this paper, we show there also exist backward bifurcation and saddle node bifurcation in this model. Our investigation demonstrates the existence of post-bifurcation phenomenon in the system when the immune strength was selected
Wang, Tengfei, Wang, Shaoli, Xu, Fei
openaire   +2 more sources

Bifurcation diagram for saddle/source bimodal linear dynamical systems [PDF]

, 2016
We continue the study of the structural stability and the bifurcations of planar bimodal linear dynamical systems (BLDS) (that is, systems consisting of two linear dynamics acting on each side of a straight line, assuming continuity along the separating ...
Ferrer Llop, Josep, Peña Carrera, Marta, Susín Sánchez, Antonio   +2 more
core   +1 more source

Complex Periodic Motions and Bifurcations of a Forced Duffing Oscillator with Its Field-Programmable Gate Arrays Implementation

Applied Sciences
The dynamical behavior of a Duffing oscillator under periodic excitation is investigated using semi-analytical methods. Bifurcation trees with varying periodic excitation are constructed.
Yan Liu, Zehua Yang, Taokai Mao, Wencheng Li   +3 more
doaj   +1 more source

Hopf-zero bifurcation of Oregonator oscillator with delay

Advances in Difference Equations, 2018
In this paper, we study the Hopf-zero bifurcation of Oregonator oscillator with delay. The interaction coefficient and time delay are taken as two bifurcation parameters. Firstly, we get the normal form by performing a center manifold reduction and using
Yuting Cai, Liqin Liu, Chunrui Zhang
doaj   +1 more source

Dynamic analysis of a Leslie-Gower predator-prey model with the fear effect and nonlinear harvesting

Mathematical Biosciences and Engineering, 2023
In this paper, we investigate the stability and bifurcation of a Leslie-Gower predator-prey model with a fear effect and nonlinear harvesting. We discuss the existence and stability of equilibria, and show that the unique equilibrium is a cusp of ...
Hongqiuxue Wu, Zhong Li, Mengxin He
doaj   +1 more source

Action functional as an early warning indicator in the space of probability measures via Schrödinger bridge

Quantitative Biology, Volume 13, Issue 3, September 2025.
Abstract Critical transitions and tipping phenomena between two meta‐stable states in stochastic dynamical systems are a scientific issue. In this work, we expand the methodology of identifying the most probable transition pathway between two meta‐stable states with Onsager–Machlup action functional, to investigate the evolutionary transition dynamics ...
Peng Zhang, Ting Gao, Jin Guo, Jinqiao Duan   +3 more
wiley   +1 more source

Bistable Chimera Attractors on a Triangular Network of Oscillator Populations

, 2010
We study a triangular network of three populations of coupled phase oscillators with identical frequencies. The populations interact nonlocally, in the sense that all oscillators are coupled to one another, but more weakly to those in neighboring ...
Erik A. Martens, J. von Neumann, Y. Kuramoto, Y. Kuramoto   +3 more
core   +1 more source

A Series of Saddle - Node Bifurcation and Chaotic Behavior of a Family of a Semi - Triangular Maps [PDF]

Al-Rafidain Journal of Computer Sciences and Mathematics, 2013
This paper studies the bifurcations in dynamics of a family of semi-triangular maps . We will prove that this family has a series of Saddle-node bifurcations and a period doubling bifurcation.
Salma Faris, Ammar Jameel
doaj   +1 more source