Positivity and boundedness preserving numerical algorithm for the solution of fractional nonlinear epidemic model of HIV/AIDS transmission

Z Iqbal, N Ahmed, D Baleanu, W Adel, M Rafiq… - Chaos, Solitons & …, 2020 - Elsevier
In this article, an integer order nonlinear HIV/AIDS infection model is extended to the non-
integer nonlinear model. The Grunwald Letnikov nonstandard finite difference scheme is …

Design of a nonlinear model for the propagation of COVID-19 and its efficient nonstandard computational implementation

M Rafiq, JE Macias-Diaz, A Raza, N Ahmed - Applied Mathematical …, 2021 - Elsevier
In this manuscript, we develop a mathematical model to describe the spreading of an
epidemic disease in a human population. The emphasis in this work will be on the study of …

Analysis of a nonstandard computer method to simulate a nonlinear stochastic epidemiological model of coronavirus-like diseases

JE Macías-Díaz, A Raza, N Ahmed, M Rafiq - Computer Methods and …, 2021 - Elsevier
Background and objective: We propose a nonstandard computational model to approximate
the solutions of a stochastic system describing the propagation of an infectious disease. The …

[PDF][PDF] Differential equation models for infectious diseases: Mathematical modeling, qualitative analysis, numerical methods and applications

MT Hoang, M Ehrhardt - 2024 - imacm.uni-wuppertal.de
Mathematical epidemiology has a long history of origin and development. In particular,
mathematical modeling and analysis of infectious diseases has become a fundamental and …

Spatio-temporal numerical modeling of reaction-diffusion measles epidemic system

N Ahmed, Z Wei, D Baleanu, M Rafiq… - … Journal of Nonlinear …, 2019 - pubs.aip.org
In this work, we investigate the numerical solution of the susceptible exposed infected and
recovered measles epidemic model. We also evaluate the numerical stability and the …

Structure preserving numerical analysis of HIV and CD4+ T-cells reaction diffusion model in two space dimensions

N Ahmed, M Rafiq, W Adel, H Rezazadeh, I Khan… - Chaos, Solitons & …, 2020 - Elsevier
In this paper, a new HIV CD4+ T cells reaction-diffusion model in two dimensions has been
introduced. Two novel and efficient positivity preserving finite difference schemes for the …

Numerical modeling and theoretical analysis of a nonlinear advection-reaction epidemic system

S Azam, JE Macías-Díaz, N Ahmed, I Khan… - Computer Methods and …, 2020 - Elsevier
Background and objective: Epidemic models are used to describe the dynamics of
population densities or population sizes under suitable physical conditions. In view that …

New insights into a chaotic system with only a Lyapunov stable equilibrium

B Chen, Y Liu, Z Wei, C Feng - Mathematical Methods in the …, 2020 - Wiley Online Library
This paper gives some new insights into a chaotic system. The considered system has only
one Lyapunov stable equilibrium and positive Lyapunov exponent in some certain …

[HTML][HTML] Analysis and nonstandard numerical design of a discrete three-dimensional hepatitis B epidemic model

JE Macías-Díaz, N Ahmed, M Rafiq - Mathematics, 2019 - mdpi.com
In this work, we numerically investigate a three-dimensional nonlinear reaction-diffusion
susceptible-infected-recovered hepatitis B epidemic model. To that end, the stability and …

A dynamically consistent approximation for an epidemic model with fuzzy parameters

F Dayan, N Ahmed, M Rafiq, MS Iqbal, I Khan… - Expert Systems with …, 2022 - Elsevier
In this article, a susceptible, infectious, and recovered (SIR) model with fuzzy parameters is
discussed. These concepts are uncertain due to the different degrees of susceptibility …