Zafar Ullah

Dr. Zafar Ullah

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Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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21 April 2019 in Mathematics
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Gauhar RahmanGauhar Rahman
Gauhar Rahman
ZUZafar Ullah
Zafar Ullah
AKAftab Khan
Aftab Khan
ERHAN SetERHAN Set
ERHAN Set
KNKottakkaran Sooppy Nisar
Kottakkaran Sooppy Nisar
Since an interesting functional by P.L. Chebyshev was presented in the year 1882, many results, which are called Chebyshev-type inequalities, have been established. Some of these inequalities were obtained by using fractional integral operators. Very recently, a new variant of the fractional conformable integral operator was introduced by Jarad et al. Motivated by this operator, we aim at establishing novel inequalities for a class of differentiable functions, which are associated with Chebyshev’s functional, by employing a fractional conformable integral operator. We also aim at showing important connections of the results here with those including Riemann–Liouville fractional and classical integrals.

2 December 2019 in Advances in Difference Equations
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AKA. Khalid
A. Khalid
MNM. N. Naeem
M. N. Naeem
Praveen AgarwalPraveen Agarwal
Praveen Agarwal
AGA. Ghaffar
A. Ghaffar
ZUZafar Ullah
Zafar Ullah
SJS. Jain
S. Jain
In the current paper, authors proposed a computational model based on the cubic B-spline method to solve linear 6th order BVPs arising in astrophysics. The prescribed method transforms the boundary problem to a system of linear equations. The algorithm we are going to develop in this paper is not only simply the approximation solution of the 6th order BVPs using cubic B-spline, but it also describes the estimated derivatives of 1st order to 6th order of the analytic solution at the same time. This novel technique has lesser computational cost than numerous other techniques and is second order convergent. To show the efficiency of the proposed method, four numerical examples have been tested. The results are described using error tables and graphs and are compared with the results existing in the literature.

3 June 2019 in Mathematics
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AKAasma Khalid
Aasma Khalid
MNMuhammad Nawaz Naeem
Muhammad Nawaz Naeem
ZUZafar Ullah
Zafar Ullah
AGabdul ghaffar
abdul ghaffar
Dumitru BaleanuDumitru Baleanu
Dumitru Baleanu
MQMaysaa Al Qurashi
Maysaa Al Qurashi
This paper is devoted to the study of the Cubic B-splines to find the numerical solution of linear and non-linear 8th order BVPs that arises in the study of astrophysics, magnetic fields, astronomy, beam theory, cylindrical shells, hydrodynamics and hydro-magnetic stability, engineering, applied physics, fluid dynamics, and applied mathematics. The recommended method transforms the boundary problem to a system of linear equations. The algorithm we are going to develop in this paper is not only simply the approximation solution of the 8th order BVPs using Cubic-B spline but it also describes the estimated derivatives of 1st order to 8th order of the analytic solution. The strategy is effectively applied to numerical examples and the outcomes are compared with the existing results. The method proposed in this paper provides better approximations to the exact solution.

18 July 2019 in Mathematics
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AGabdul ghaffar
abdul ghaffar
MBMehwish Bari
Mehwish Bari
ZUZafar Ullah
Zafar Ullah
MIMUDASSAR IQBAL
MUDASSAR IQBAL
KNKottakkaran Sooppy Nisar
Kottakkaran Sooppy Nisar
Dumitru BaleanuDumitru Baleanu
Dumitru Baleanu
The main objective of this study is to introduce a new class of 2 q -point approximating nonstationary subdivision schemes (ANSSs) by applying Lagrange-like interpolant. The theory of asymptotic equivalence is applied to find the continuity of the ANSSs. These schemes can be nicely generalized to contain local shape parameters that allow the user to locally adjust the shape of the limit curve/surface. Moreover, many existing approximating stationary subdivision schemes (ASSSs) can be obtained as nonstationary counterparts of the proposed ANSSs.

22 February 2021 in Frontiers in Physics
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AUAuwalu Hamisu Usman
Auwalu Hamisu Usman
NKNoor Saeed Khan
Noor Saeed Khan
Usa HumphriesUsa Humphries
Usa Humphries
PKProfessor Poom Kumam
Professor Poom Kumam
Poom KumamPoom Kumam
Poom Kumam
ZUZafar Ullah
Zafar Ullah
The analysis is carried out to analyze the flow through double stretchable rotating disks with the theory of radiative Cross nanofluid under the influence of variable thermal conductivity, the Hall current, Arrhenius activation energy, and binary chemical reactions. The Buongiorno nanofluid model is adopted for the governing equations of the problem which are transformed into ordinary differential equations through similarity transformations and then solved using the homotopy analysis method. The impact of dimensionless parameters on all profiles and physical quantities is presented and discussed. The radial velocity of the two disks increases with their corresponding ratio stretching rate parameter and decreases with the Hall parameter and the bioconvection Rayleigh number. The heat transfer at the lower disk enhances with the variable thermal conductivity parameter, while at the upper disk, opposite trend is observed. Mass transfer increases with the chemical reactions and temperature difference parameters at the lower disk and decreases with Arrhenius activation energy, whereas an opposite trend is observed at the upper disk. The local density number is enhanced for the larger values of Peclet and Lewis numbers. The comparison of the present work with the published literature authenticates the validation of the present work.

7 August 2019 in Advances in Difference Equations
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AGabdul ghaffar
abdul ghaffar
ZUZafar Ullah
Zafar Ullah
MBMehwish Bari
Mehwish Bari
KNKottakkaran Sooppy Nisar
Kottakkaran Sooppy Nisar
MAMaysaa M. Al-Qurashi
Maysaa M. Al-Qurashi
DBDumitru Baleanu
Dumitru Baleanu
A new class of 2m-point non-stationary subdivision schemes (SSs) is presented, including some of their important properties, such as continuity, curvature, torsion monotonicity, and convexity preservation. The multivariate analysis of subdivision schemes is extended to a class of non-stationary schemes which are asymptotically equivalent to converging stationary or non-stationary schemes. A comparison between the proposed schemes, their stationary counterparts and some existing non-stationary schemes has been depicted through examples. It is observed that the proposed SSs give better approximation and more effective results.