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346 results on '"Ahmad, Israr"'

17. On the existence and numerical simulation of Cholera epidemic model

Author

Shah Kamal, Ahmad Israr, Shafiullah, Mukheimer Aiman, Abdeljawad Thabet, and Jeelani Mdi Begum

Subjects
transmission dynamics, cfffd, fixed point approach, adam’s bashforth numerical method, Physics, QC1-999
Abstract

A model describing the transmission dynamics of cholera is considered in this article. The concerned model is investigated under the Caputo-Fabrizio fractal fractional derivative. The objective of this article is to study theoretical and numerical results for the model under our consideration. Classical fixed point approach is used to obtain sufficient conditions for the existence of solution to the proposed model. Adam’s Bashforth numerical method is utilized for the numerical interpretation of the suggested model. The considered technique is a powerful mathematical tool, that provides a numerical solution for the concerned problem. To discuss the transmission dynamics of the considered model, several graphical presentations are given.

Published
2024
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29. Integrated Pricing and Inventory Control for Perishable Products, Taking into Account the Lack of Backlog and Inventory Management Policy by the Seller

Author

Assiddiqi Muktadi Amri, Anantadjaya Samuel Pd, Ahmad Israr, Le Kien, Iswanto A. Heri, Trung Nguyen Dinh, Al-Sudani Ahmed Qassem Ali Sharhan, Huy Dinh Tran Ngoc, and Mutlak Dhameer A.

Subjects
inventory control policy, perishable products, shortage, pricing, optimal order quantity, Electronic computers. Computer science, QA75.5-76.95
Abstract

Recently, utilizing appropriate inventory control policy and determining the optimal selling price for various goods has been the main topic of scientific and industrial research. Inventory management policy 1 by the seller is one solution that improves the chain’s performance by creating coordination between members of the supply chain. The current study attempts to devise an integrated model of inventory pricing and control under the inventory management policy by the seller for perishable goods with shortages is considered. The purpose of presenting the model is to determine the optimal price, the optimal repayment time, and the order size, in order to maximize the profit. To acquire those optimal values, the profit functions of the buyer and the seller are taken into account. Given the results acquired, it is demonstrated that at any cost, the repayment time is unique and optimal. It is concluded that with the optimal recovery time available, the objective function is a concave function of price, and its optimal value is available. Furthermore, utilizing the inventory management policy by the seller could be a proper means to reducing retailer costs while raising their profit.

Published
2022
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38. A time-efficient nonlinear control method for the hyperchaotic finance system synchronization.

Author

Haris, Muhammad, Shafiq, Muhammad, Ahmad, Israr, Ali, Zulfiqar, Manickam, Geethalakshmi, and Ghaffar, Abid

Subjects
CHAOS synchronization, SYNCHRONIZATION, LYAPUNOV stability, MATHEMATICAL proofs, CLOSED loop systems, IMAGE encryption, ADAPTIVE control systems
Abstract

Irregular and complex behavior in the financial system can disrupt stability and smooth economic growth. It causes randomness within the system, generating chaos; hindering synchronization behaviour. Achieving smooth and rapid synchronization between two coupled hyperchaotic finance (HF) systems with lessened fluctuation of input and output signals is vital for continuing financial stability and fostering economic growth, a challenge addressed in this article. The paper proposes a novel time-efficient nonlinear control (TENLC) technique and investigates HF systems synchronization using the drive-response system (DRS) arrangement. The proposed TENLC strategy realizes fast and smooth synchronization behaviour between two coupled HF systems, reducing closed-loop state-variable trajectory oscillations. The controller is designed to retain the nonlinear components within the closed-loop system and does not depend on the system's parameters, simplifying the design and analysis process. The Lyapunov stability technique confirms the closed-loop's global stability at the origin. Proofs of mathematical analysis and computer-based simulation results validate the theoretical findings, showing that the presented TENLC strategy converges the state error trajectories to zero in a short transient time with lessened fluctuations for all signals. The comparative computer-based simulation analysis confirms that the presented TENLC approach outperforms other synchronization control techniques. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Displacement rate effects on mixed-mode I/II delamination of laminated carbon/epoxy composites

Author

Kean Ong Low, Mahzan Johar, Aun Naa Sung, Mohd Nazri Mohd Nasir, Seyed Saeid Rahimian Koloor, Michal Petrů, Haris Ahmad Israr, and King Jye Wong

Subjects
Carbon/epoxy composite, Rate dependence, Mixed-mode delamination, Fractography, Cohesive zone modelling, Polymers and polymer manufacture, TP1080-1185
Abstract

Mixed-mode delamination is one of the common failures of composites which has not been studied under low-impact loading. This paper studies the influence of displacement rate on mixed-mode I/II delamination of unidirectional carbon/epoxy composites. Single leg bending test is performed at displacement rates of 1, 10, 100, and 500 mm/min. Experimental results reveal that the mixed-mode I/II fracture toughness is invariant with the displacement rate. In addition, scanning electron micrographs shows that shear cusps are more obvious at 1, 10, and 100 mm/min. At 500 mm/min, significant matrix debris is noticed. Furthermore, the proposed three-dimensional rate-dependent fracture criterion is found to well predict the fracture toughness. Numerical simulation using cohesive zone model suggests that the lower numerical peak load is due to lower damage dissipated energy. In addition, the theoretical and numerical traction-separation responses show significant differences, which is also reflected in the numerical phase angle. This implies that the local mixed-mode ratio is not constant throughout the simulation process.

Published
2022
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