Search results for: Ahmed Alsaedi

Items from 1 to 20 out of 510 results

article

Entropy generation in MHD Darcy–Forchheimer flow of hybrid nanomaterial: A numerical study of local similar solution

Tasawar Hayat, Muhammad Yazman, Khursheed Muhammad, Ahmed Alsaedi

ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für... > 104 > 2 > n/a - n/a

The presented article aims to analyze the three‐dimensional electrically conducting flow induced by a rotating stretchable disk. A hybrid nanomaterial is generated by adding copper and graphene oxide nanoparticles to kerosene oil, which saturates through a Darcy–Forchheimer porous medium. The article also reports on entropy generation and the Bejan number. To solve the associated partial differential...

article

Mathematical modelling for peristaltic flow of fourth‐grade nanoliquid with entropy generation

Zahid Nisar, Tasawar Hayat, Ahmed Alsaedi, Shaher Momani

ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für... > 104 > 1 > n/a - n/a

Nanomaterials having excellent thermal properties are employed in producing energy, extrusion processes, engineering processes, nuclear interactions, industrial domains and aero‐spaces, etc. Therefore, current study scrutinizes the aspects of entropy optimization and Ohmic heating on MHD peristalsis of fourth‐grade nanoliquid in a channel. Flexible channel walls retain concentration, thermal slip...

article

A multi‐group SEIRI epidemic model with logistic population growth under discrete Markov switching: Extinction, persistence, and positive recurrence

Zhenfeng Shi, Daqing Jiang, Ahmed Alsaedi

Mathematical Methods in the Applied Sciences > 46 > 5 > 5349 - 5369

This paper is concerned with the stochastic dynamics of a multi‐group stochastic SEIRI epidemic model with logistic population growth, standard incidence rate, and Markovian switching. For this purpose, we first show that the solution of the stochastic system is positive and global. Then we obtain sufficient conditions for the extinction of disease. In addition, the persistence in the mean of disease...

article

Extinction and positive recurrence of a regime‐switching HIV/AIDS model with treatment and standard incidence

Miaomiao Gao, Daqing Jiang, Tasawar Hayat, Ahmed Alsaedi

Mathematical Methods in the Applied Sciences > 45 > 17 > 10982 - 11002

In this paper, we investigate the dynamics of a high‐dimensional human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS) model with treatment and standard incidence, which is perturbed by telegraph noise. The switching is formulated by a continuous time Markov chain. Firstly, we show the existence and uniqueness of the global positive solution. Then, conditions for extinction...

article

The impact of nonlinear perturbation to the dynamics of HIV model

Zhenfeng Shi, Daqing Jiang, Ningzhong Shi, Tasawar Hayat, more

Mathematical Methods in the Applied Sciences > 45 > 5 > 2542 - 2562

In this paper, we developed and studied a stochastic HIV model with nonlinear perturbation. Through a rigorous analysis, we firstly showed that the solution of the stochastic model is positive and global. Then, by employing suitable stochastic Lyapunov functions, we prove that the stochastic model admit a unique ergodic stationary distribution. In addition, sufficient conditions for the extinction...

article

Global projective synchronization in fractional‐order quaternion valued neural networks

Weiwei Zhang, Hai Zhang, Jinde Cao, Hongmei Zhang, more

Asian Journal of Control > 24 > 1 > 227 - 236

The analysis of projective synchronization for fractional‐order quaternion valued neural networks (FOQVNN) is addressed in this paper. The FOQVNN is separated into four real valued parts through Hamilton rules, enabling its synchronization analysis. Some criteria are formulated by the use of fractional differential inequality techniques; projective synchronization of FOQVNN is implemented by designing...

article

Stationary distribution and periodic solution of a stochastic Nicholson's blowflies model with distributed delay

Xiaojie Mu, Daqing Jiang, Tasawar Hayat, Ahmed Alsaedi, more

Mathematical Methods in the Applied Sciences > 44 > 17 > 13756 - 13773

Due to the complex set of abiotic and biotic interaction variables in the ecosystems, the dynamics of animal populations are generally considered to be driven in astate‐dependent manner. This paper presents an analysis of a stochastic Nicholson's blowflies model with distributed delay, which consists of the existence and uniqueness of globally positive solution, extinction, existence of positive T...

article

Recursive least squares estimation methods for a class of nonlinear systems based on non‐uniform sampling

Qilin Liu, Feiyan Chen, Feng Ding, Ahmed Alsaedi, more

International Journal of Adaptive Control and Signal Processing > 35 > 8 > 1612 - 1632

Many dynamic processes in practice have nonlinear characteristics and must be described by using nonlinear models. It remains to be a challenging problem to build the models of such nonlinear systems and to estimate their parameters. This article studies the parameter estimation problem for a class of Hammerstein‐Wiener nonlinear systems based on non‐uniform sampling. By means of the auxiliary model...

article

Existence results for a coupled system of nonlinear multi‐term fractional differential equations with anti‐periodic type coupled nonlocal boundary conditions

Bashir Ahmad, Manal Alblewi, Sotiris K. Ntouyas, Ahmed Alsaedi

Mathematical Methods in the Applied Sciences > 44 > 11 > 8739 - 8758

This paper is concerned with the existence and uniqueness of solutions for a coupled system of nonlinear multi‐term fractional differential equations with anti‐periodic type coupled nonlocal boundary conditions. The existence of a unique solution is proved via Banach contraction mapping principle, while two existence results are proved by using Krasnosel'skiic̆'s fixed point theorem and Leray‐Schauder...

article

Auxiliary model‐based iterative parameter estimation for a nonlinear output‐error system with saturation and dead‐zone nonlinearity

Xiao Wang, Feng Ding, Ahmed Alsaedi, Tasawar Hayat

International Journal of Robust and Nonlinear Control > 31 > 9 > 4262 - 4286

This article is concerned with the parameter estimation problem of a nonlinear output‐error system with saturation and dead‐zone nonlinearity. The saturation nonlinearities and the dead‐zone nonlinearities are widely encountered in engineering applications and the identification for the nonlinear systems with these nonlinearities is very crucial. Based on the over‐parameterization identification model...

article

Hierarchical recursive signal modeling for multifrequency signals based on discrete measured data

Ling Xu, Feiyan Chen, Feng Ding, Ahmed Alsaedi, more

International Journal of Adaptive Control and Signal Processing > 35 > 5 > 676 - 693

This paper studies the problem of parameter estimation for the multifrequency sine signals, which have multiple characteristic parameters such as the amplitudes, phases, and frequencies. It is noted that the signal output is nonlinear with respect to the phase and frequency parameters while it is linear with respect to the amplitude parameters. This feature inspires us to separate all of the characteristic...

article

Existence theory for a system of coupled multi‐term fractional differential equations with integral multi‐strip coupled boundary conditions

Bashir Ahmad, Najla Alghamdi, Ahmed Alsaedi, Sotiris K. Ntouyas

Mathematical Methods in the Applied Sciences > 44 > 3 > 2325 - 2342

In this paper, we study a new boundary value problem of coupled nonlinear multi‐term fractional differential equations supplemented with integral multi‐strip coupled boundary conditions. The modern tools of fractional analysis are applied to derive the existence and uniqueness results for the given problem. We emphasize that our results are new and enrich the literature on the topic.

article

Parameter estimation for time‐delay systems based on the frequency responses and harmonic balance methods

Jiayao Ni, Ling Xu, Feng Ding, Ya Gu, more

International Journal of Adaptive Control and Signal Processing > 34 > 12 > 1779 - 1798

Two parameter estimation methods for linear time‐delay systems are proposed based on the frequency responses and the harmonic balance methods. One is the stochastic gradient gradient‐based iterative (SG‐GI) algorithm and the other is the recursive least squares gradient‐based iterative (RLS‐GI) algorithm. These two methods can estimate the unknown parameters and the unknown time delays simultaneously...

article

Stationary distribution and extinction for a food chain chemostat model with random perturbation

Miaomiao Gao, Daqing Jiang, Tasawar Hayat, Ahmed Alsaedi

Mathematical Methods in the Applied Sciences > 44 > 1 > 1013 - 1028

In this paper, we study the dynamical behavior of a stochastic food chain chemostat model, in which the white noise is proportional to the variables. Firstly, we prove the existence and uniqueness of the global positive solution. Then by constructing suitable Lyapunov functions, we show the system has a unique ergodic stationary distribution. Furthermore, the extinction of microorganisms is discussed...

article

Maximum likelihood‐based adaptive differential evolution identification algorithm for multivariable systems in the state‐space form

Ting Cui, Ling Xu, Feng Ding, Ahmed Alsaedi, more

International Journal of Adaptive Control and Signal Processing > 34 > 11 > 1658 - 1676

Parameter estimation plays an important role in the field of system control. This article is concerned with the parameter estimation methods for multivariable systems in the state‐space form. For the sake of solving the identification complexity caused by a large number of parameters in multivariable systems, we decompose the original multivariable system into some subsystems containing fewer parameters...

article

Parameter identification of a nonlinear radial basis function‐based state‐dependent autoregressive network with autoregressive noise via the filtering technique and the multiinnovation theory

Yihong Zhou, Fengying Ma, Feng Ding, Ling Xu, more

International Journal of Robust and Nonlinear Control > 30 > 17 > 7619 - 7634

This article studies the parameter estimation problems of radial basis function‐based state‐dependent autoregressive models with autoregressive noises (RBF‐ARAR models). To reduce the effect of the colored noise to parameter estimation, the data filtering technique is applied and a filtering based generalized stochastic gradient algorithm is derived for the RBF‐ARAR models. In order to achieve more...

article

Three‐stage least squares‐based iterative estimation algorithms for bilinear state‐space systems based on the bilinear state estimator

Siyu Liu, Yanliang Zhang, Feng Ding, Ahmed Alsaedi, more

International Journal of Adaptive Control and Signal Processing > 34 > 10 > 1501 - 1518

Because of the product item of the control input and the state vector, the identification of bilinear systems is difficult. This paper considers the combined parameter and state estimation problems of bilinear state‐space systems. On the basis of the observability canonical form and the model transformation, an identification model with a linear combination of the system parameters is obtained. Using...

article

A delay‐dependent asymptotic stability criteria for uncertain BAM neural networks with leakage and discrete time‐varying delays: A novel summation inequality

Chandran Sowmiya, Ramachandran Raja, Jinde Cao, Grienggrai Rajchakit, more

Asian Journal of Control > 22 > 5 > 1880 - 1891

This proposed research work aims to investigate the problem of uncertain BAM neural networks with leakage and discrete time‐varying delays in the sense of asymptotic stable by applying convex combination approach, discrete‐time Wirtinger inequality. It is pointed out that a novel summation inequality is entrenched based on discrete type Wirtinger based inequality. By the aid of novel inequality, reciprocally...

article

Maximum likelihood‐based gradient estimation for multivariable nonlinear systems using the multiinnovation identification theory

Huafeng Xia, Yan Ji, Ling Xu, Ahmed Alsaedi, more

International Journal of Robust and Nonlinear Control > 30 > 14 > 5446 - 5463

This article considers the identification problems of multivariable input nonlinear systems with unmeasured disturbances. For the identification difficulty caused by the crossproducts between the parameters of the linear block and the nonlinear block, the key term separation technique is adopted to separate the parameters of the nonlinear block from the parameters of the linear block. By combining...

article

High Performance Quasi‐2D Perovskite Sky‐Blue Light‐Emitting Diodes Using a Dual‐Ligand Strategy

Fuzhi Wang, Zhenye Wang, Wenda Sun, Zhibin Wang, more

Small > 16 > 32 > n/a - n/a

For quasi‐2D perovskite light‐emitting diodes, the introduction of insulating bulky cation reduces the charge transport property, leading to lowered brightness and increased turn‐on voltage. Herein, a dual‐ligand strategy is adopted to prepare perovskite films by using an appropriate ratio of i‐butylammonium (iBA) and phenylethylammonium (PEA) as capping ligands. The introduction of iBA enhances the...

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INFONA - science communication portal

Search results for: Ahmed Alsaedi

Entropy generation in MHD Darcy–Forchheimer flow of hybrid nanomaterial: A numerical study of local similar solution

Mathematical modelling for peristaltic flow of fourth‐grade nanoliquid with entropy generation

A multi‐group SEIRI epidemic model with logistic population growth under discrete Markov switching: Extinction, persistence, and positive recurrence

Extinction and positive recurrence of a regime‐switching HIV/AIDS model with treatment and standard incidence

The impact of nonlinear perturbation to the dynamics of HIV model

Global projective synchronization in fractional‐order quaternion valued neural networks

Stationary distribution and periodic solution of a stochastic Nicholson's blowflies model with distributed delay

Recursive least squares estimation methods for a class of nonlinear systems based on non‐uniform sampling

Existence results for a coupled system of nonlinear multi‐term fractional differential equations with anti‐periodic type coupled nonlocal boundary conditions

Auxiliary model‐based iterative parameter estimation for a nonlinear output‐error system with saturation and dead‐zone nonlinearity

Hierarchical recursive signal modeling for multifrequency signals based on discrete measured data

Existence theory for a system of coupled multi‐term fractional differential equations with integral multi‐strip coupled boundary conditions

Parameter estimation for time‐delay systems based on the frequency responses and harmonic balance methods

Stationary distribution and extinction for a food chain chemostat model with random perturbation

Maximum likelihood‐based adaptive differential evolution identification algorithm for multivariable systems in the state‐space form

Parameter identification of a nonlinear radial basis function‐based state‐dependent autoregressive network with autoregressive noise via the filtering technique and the multiinnovation theory

Three‐stage least squares‐based iterative estimation algorithms for bilinear state‐space systems based on the bilinear state estimator

A delay‐dependent asymptotic stability criteria for uncertain BAM neural networks with leakage and discrete time‐varying delays: A novel summation inequality

Maximum likelihood‐based gradient estimation for multivariable nonlinear systems using the multiinnovation identification theory

High Performance Quasi‐2D Perovskite Sky‐Blue Light‐Emitting Diodes Using a Dual‐Ligand Strategy

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