10 results
Search Results
2. Stability and Hopf bifurcation of a diffusive Gompertz population model with nonlocal delay effect
- Author
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Xiuli Sun, Luan Wang, and Baochuan Tian
- Subjects
Hopf bifurcation ,Applied Mathematics ,nonlocal delay ,010102 general mathematics ,Gompertz function ,stability ,01 natural sciences ,Stability (probability) ,hopf bifurcations ,010101 applied mathematics ,symbols.namesake ,Population model ,QA1-939 ,symbols ,reaction–diffusion ,Applied mathematics ,0101 mathematics ,Mathematics - Abstract
In this paper, we investigate the dynamics of a diffusive Gompertz population model with nonlocal delay effect and Dirichlet boundary condition. The stability of the positive spatially nonhomogeneous steady-state solutions and the existence of Hopf bifurcations with the change of the time delay are discussed by analyzing the distribution of eigenvalues of the infinitesimal generator associated with the linearized system. Then we derive the stability and bifurcation direction of Hopf bifurcating periodic orbits by using the normal form theory and the center manifold reduction. Finally, we give some numerical simulations.
- Published
- 2018
3. Analysis of Lauffenburger-Kennedy bacterial infection model for tissue inflammation dynamics
- Author
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Yuxin Zhang, Yu Yang, and Alhaji Cherif
- Subjects
0301 basic medicine ,steady states ,Time Factors ,Steady state (electronics) ,Inflammatory response ,numerical results ,Models, Biological ,hopf bifurcations ,lauffenburger-kennedy bacterial infection model ,03 medical and health sciences ,symbols.namesake ,Humans ,Applied mathematics ,lcsh:QH301-705.5 ,lcsh:Environmental sciences ,Ecology, Evolution, Behavior and Systematics ,Bifurcation ,Mathematics ,lcsh:GE1-350 ,Inflammation ,Hopf bifurcation ,Ecology ,Dynamics (mechanics) ,Bacterial Infections ,030104 developmental biology ,lcsh:Biology (General) ,Homogeneous ,symbols ,Tissue inflammation - Abstract
In this paper, we analyze a mathematical model for an inflammatory response to bacterial infection of homogeneous tissues. Specifically, we provide a detailed analysis of the Lauffenburger-Kennedy bacterial infection model and show that the model exhibits three possible equilibria corresponding to a bacteria-free and two endemic compromised steady states. Asymptotic results of the steady states along with the existences of saddle-node connection Hopf bifurcations are shown under certain conditions of the parameters. Within the biological ranges of the parameter values, we observe that the system can exhibit both forward and backward bifurcation. In addition, in both cases, the larger compromise bacterial infection steady state can either approach an equilibrium or can oscillate around it via Hopf bifurcation depending on the value of the ratio of leukocyte mortality to phagocytosis rates. Numerical results are used to provide illustrative examples of these different dynamical patterns observed in the model.
- Published
- 2018
4. Stability and Bifurcation Analysis on a Predator–Prey System with the Weak Allee Effect
- Author
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Lijun Zhang, Jianming Zhang, and Yuzhen Bai
- Subjects
Hopf bifurcation ,lcsh:Mathematics ,General Mathematics ,010102 general mathematics ,Dynamics (mechanics) ,Mathematical analysis ,stability switches ,Hopf bifurcations ,lcsh:QA1-939 ,01 natural sciences ,Stability (probability) ,weak Allee effect ,Predation ,010101 applied mathematics ,symbols.namesake ,Bifurcation analysis ,Computer Science (miscellaneous) ,symbols ,Quantitative Biology::Populations and Evolution ,predator-prey system ,0101 mathematics ,Engineering (miscellaneous) ,Center manifold ,Mathematics ,Allee effect - Abstract
In this paper, the dynamics of a predator-prey system with the weak Allee effect is considered. The sufficient conditions for the existence of Hopf bifurcation and stability switches induced by delay are investigated. By using the theory of normal form and center manifold, an explicit expression, which can be applied to determine the direction of the Hopf bifurcations and the stability of the bifurcating periodic solutions, are obtained. Numerical simulations are performed to illustrate the theoretical analysis results.
- Published
- 2019
5. Local Bifurcations in a Nonlinear Model of a Bioreactor
- Author
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Dimitrova, Neli
- Subjects
Hopf Bifurcations ,Nonlinear Model ,Transcritical Bifurcations ,Continuously Stirred Bioreactor ,Equilibrium Points - Abstract
We consider a nonlinear model of a continuously stirred bioreactor and study the stability of the equilibrium points with respect to practically important model parameters. We determine regions in the parameter space where the steady states undergo transcritical and Hopf bifurcations. In the latter case, the stability of the emerged limit cycles is also studied. Numerical simulations in the computer algebra system Maple are presented to illustrate the theoretical results., This paper is partially supported by the Bulgarian Science Fund under grant Nr. DO 02– 359/2008.
- Published
- 2009
6. Bifurcation analysis for a regulated logistic growth model
- Author
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Yongli Song and Sanling Yuan
- Subjects
Hopf bifurcation ,Delay ,Differential equation ,Periodic solutions ,Applied Mathematics ,Hopf bifurcations ,Topology ,Stability (probability) ,Biological applications of bifurcation theory ,symbols.namesake ,Pitchfork bifurcation ,Modeling and Simulation ,Modelling and Simulation ,symbols ,Applied mathematics ,Logistic function ,Stability ,Center manifold ,Linear stability ,Mathematics - Abstract
In this paper, we consider a regulated logistic growth model. We first consider the linear stability and the existence of a Hopf bifurcation. We show that Hopf bifurcations occur as the delay τ passes through critical values. Then, using the normal form theory and center manifold reduction, we derive the explicit algorithm determining the direction of Hopf bifurcations and the stability of the bifurcating periodic solutions. Finally, numerical simulation results are given to support the theoretical predictions.
- Published
- 2007
- Full Text
- View/download PDF
7. Bifurcation analysis on a survival red blood cells model
- Author
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Yuan Yuan, Junjie Wei, and Yongli Song
- Subjects
Hopf bifurcation ,Sequence ,Periodic solutions ,Applied Mathematics ,Mathematical analysis ,Geometry ,Hopf bifurcations ,Critical value ,Stability (probability) ,Nonlinear Sciences::Chaotic Dynamics ,Continuation ,symbols.namesake ,Pitchfork bifurcation ,Mathematics::Quantum Algebra ,symbols ,Periodic orbits ,Stability ,Nonlinear Sciences::Pattern Formation and Solitons ,Time delay ,Center manifold ,Analysis ,Mathematics - Abstract
In this paper, we consider a model described the survival of red blood cells in animal. Its dynamics are studied in terms of local and global Hopf bifurcations. We show that a sequence of Hopf bifurcations occur at the positive equilibrium as the delay crosses some critical values. Using the reduced system on the center manifold, we also obtain that the periodic orbits bifurcating from the positive equilibrium are stable in the center manifold, and all Hopf bifurcations are supercritical. Further, particular attention is focused on the continuation of local Hopf bifurcation. We show that global Hopf bifurcations exist after the second critical value of time delay.
- Published
- 2006
- Full Text
- View/download PDF
8. Non-linear endogenous fluctuations with free entry and variable markups
- Author
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Teresa Lloyd-Braga and Rodolphe Dos Santos Ferreira
- Subjects
Marginal cost ,Economics and Econometrics ,Control and Optimization ,Multiple equilibria ,Applied Mathematics ,Factors of production ,Hopf bifurcations ,Overlapping generations model ,Indeterminacy ,Markup variability ,medicine ,Economics ,Perfect competition ,Market power ,Free entry ,medicine.symptom ,Elasticity (economics) ,Fixed cost ,Mathematical economics - Abstract
The paper explores the effects of markup variability, associated with free entry of Cournotian firms, on the occurrence of local indeterminacy, local Hopf bifurcations and multiplicity of steady states. It uses an overlapping generations model with capital, in which differentiated intermediate goods are produced with constant marginal cost plus a positive fixed cost. If the markup factor were constant (the case of no free entry or the case of zero fixed costs leading to the perfectly competitive outcome), no local endogenous fluctuations or multiplicity of steady states can emerge, unless factors of production are complementary. On the contrary, with any positive (variable) market power, indeterminacy and multiplicity of steady states is possible for any value of the elasticity of technological substitution, and local Hopf bifurcations may also emerge, provided (variable) market power is high enough.
- Published
- 2005
9. Cycles in dynamic economic modelling
- Author
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Pietro Angelo Manfredo Francesco Manfredi and Luciano Fanti
- Subjects
Hopf bifurcation ,Economics and Econometrics ,Stability (learning theory) ,Boundary (topology) ,Extension (predicate logic) ,Hopf bifurcations ,Biological applications of bifurcation theory ,Business and growth cycles ,symbols.namesake ,Perspective (geometry) ,Simple (abstract algebra) ,Dynamic economic modelling ,Delay models ,symbols ,Mathematical economics ,Bifurcation ,Mathematics - Abstract
This paper offers a unified perspective of the analytical detection of Hopf bifurcation, which is a crucial tool in dynamic economic modelling. We clarify the relations between stability theorems and the notions of simple and general Hopf bifurcations. A Lienard–Chipart-type theorem for detecting bifurcations, which appears of considerable usefulness in applications, is proved. Subsequently we show how to use the notions of ‘stability boundary’ and ‘bifurcation boundary’, providing a new, surprisingly straightforward, tool for detecting bifurcations in economics. An economic illustration is given by two models with time-delay: a Solow-type demo-economic model and a Kaleckian extension of the Lotka–Volterra–Goodwin model.
- Published
- 2004
10. Hysteretic spin-wave excitation in spin-torque oscillators as a function of the in-plane field angle: A micromagnetic description
- Author
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Anna Giordano, Eduardo Martínez, Giancarlo Consolo, A. Prattella, Giovanni Finocchio, and Bruno Azzerboni
- Subjects
spintronics ,Physics ,Magnetization dynamics ,Field (physics) ,Condensed matter physics ,Oscillation ,General Physics and Astronomy ,Ferromagnetic resonance ,hopf bifurcations ,Magnetic anisotropy ,Spin wave ,Micromagnetics ,Excitation - Abstract
This paper describes a full micromagnetic characterization of the magnetization dynamics driven by spin-polarized current in anisotropic spin-torque oscillators (STOs). For field angles approaching the hard in-plane axis, the excited mode is uniform and a super-critical Hopf-bifurcation takes place at the critical current density JC. For field angles close to the easy axis of the free layer, the excited mode is localized (non-uniform) and a sub-critical Hopf-bifurcation occurs at JC. In this latter region, a hysteretic behaviour is, therefore, found. We demonstrate numerically that the non-linearities of the STO are strongly reduced when the oscillation frequency at the critical current is near the ferromagnetic resonance (FMR) frequency computed at zero bias current, and in particular, this condition corresponds to the field orientation at which a minimum in the FMR-frequency is achieved.
- Published
- 2011
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