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5 results on '"Khattak, Shahzad"'

1. Insights of temperature-dependent fluid characteristics on micropolar material in a rotating frame with cubic autocatalysis chemical reaction

Author

Khattak, Shahzad, Khan, Muhammad Naveed, Riaz, Muhammad Bilal, Lu, Dianchen, Hussien, Mohamed, Albalwi, M Daher, and Jhangeer, Adil

Abstract

The diverse use of heat and mass transport mechanisms on three-dimensional rotating systems has been discovered to improve the efficiency of several physiological and industrial processes. These include, for example, fiber technology, the process of extrusion, and polymer extraction. The purpose of this dissertation is to investigate the transportation of mass and heat in the flow of non-Newtonian fluid processing vortex viscosity and micro-inertial features along two horizontal plates in a rotating scenario. The thermal transport process is influenced by physical parameters such as irregular heat generation/absorption rate, linear radiative heat flow, variable thermal conductivity, and mass diffusion with cubic autolysis chemical reaction. After enforcing conservation laws, a simple constitutive equations are modelled in a rotating system. The mathematical formulation is converted into a dimensionless format by applying comparable variables. The bvp4c process is used to execute numerical experiments to arrive at the numerical solution for the governing problem. Through sketching, the related distribution (velocity, micro rotation, velocity, and concentration) is presented concerning the various parameters. Tabular data provides insights into relevant quantities against different parameters. The credibility of computed results is assumed by agreeing with previous studies.Graphical AbstractThe velocity variation for different values of Reynolds number. It is analysed from the sketch that stronger values of the Reynolds number improve the fluid near the lower plate but as we move towards upper plate flow is reduced.

Published
2024
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2. Artificial Neural Network Solution for a Fractional-Order Human Skull Model Using a Hybrid Cuckoo Search Algorithm.

Author

Waseem, Ali, Sabir, Khattak, Shahzad, Ullah, Asad, Ayaz, Muhammad, Awwad, Fuad A., and Ismail, Emad A. A.

Subjects
SKULL, HEAT conduction, LEAST squares, SEARCH algorithms, TEMPERATURE distribution
Abstract

In this study, a new fractional-order model for human skull heat conduction is tackled by using a neural network, and the results were further modified by using the hybrid cuckoo search algorithm. In order to understand the temperature distribution, we introduced memory effects into our model by using fractional time derivatives. The objective function was constructed in such a way that the L 2 − error remained at a minimum. The fractional order equation was then calculated by using the proposed biogeography-based hybrid cuckoo search (BHCS) algorithm to approximate the solution. When compared to earlier simulations based on integer-order models, this method enabled us to examine the fractional-order (FO) cases, as well as the integer order. The results are presented in the form of figures and tables for the different case studies. The results obtained for the various parameters were validated numerically against the available literature, where our proposed methodology showed better performance when compared to the least squares method (LSM). [ABSTRACT FROM AUTHOR]

Published
2023
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3. OPTIMAL CONTROL PROBLEMS FOR SPACE-FRACTIONAL WAVE EQUATIONS

Author

Xia Zhang, Khattak Shahzad, and Yongqiang Fu

Subjects
General Mathematics, Weak solution, Applied mathematics, Uniqueness, Space (mathematics), Galerkin method, Wave equation, Optimal control, Mathematics
Abstract

In this paper, we study an optimal control problem for a spacefractional wave equation.First, we show the existence and uniqueness of weak solution by Galerkin approximate method.Then, we obtain an optimal control for the optimal control problem.

Published
2021

5. AN UNUSUAL CASE OF LATE ONSET DISSEMINATED STAPHYLOCOCCAL SEPSIS IN A PRETERM INFANT

Author

Khattak, Shahzad

Abstract

CASE REPORT: AN UNUSUAL CASE OF LATE ONSET DISSEMINATED STAPHYLOCOCCAL SEPSIS IN A PRETERM INFANT. Shahzad Khattak, Ian Dady, Devdeep MukherjeeNeonatal Intensive Care Unit, St Maryu2019s Hospital, ManchesterBACKGROUND:Percutaneous central venous catheters (PCVC) are commonly used in the neonatal intensive care unit. Preterm infants are more predisposed to develop catheter related blood stream infection (CRBSI) which happens to be the most common complication associated with PCVC.SUMMARY:30 weeks male baby recovering in the neonatal unit was noted to be have increasing oxygen requirement and was ventilated on 10th day of life. Sepsis screen revealed a rising C Reactive protein (CRP) along with thrombocytopenia. Blood culture grew Staphylococcus aureus (SA) and was positive for Panton Valentine Leukocidin (PVL) toxin. Within 24 hours he developed a dusky 4th toe on his right foot and an abscess overlying the antero-medial aspect of his left elbow and another overlying his Xiphisternum. Echocardiography and ophthalmological examination was normal. Magnetic resonance imaging (MRI) of whole body showed cavitating lesions in the right upper lobe, right lung base and also in the left lung. He had a multi loculated collection in the left ante cubital fossa measuring 33x17mm and a lower pre-sternal collection measuring 13x4mm. Baby had a long line in his right arm which was removed as it was believed to be the source of dissemination of the bacteria. He was initially started on Cefotaxime and Vancomycin and later changed to Flucloxacillin and Linezolid as per culture sensitivity. Baby responded well to antibiotics and was discharged without any sequelae.DISCUSSION:Sepsis due to PVL toxin producing SA can cause significant morbidity and mortality in neonates. Proper screening should be done to rule out septic foci in neonates. MRI is a good non-invasive tool to demonstrate multiple septic foci in a patient with disseminated sepsis.

Published
2017

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