Journal of the Egyptian Mathematical Society
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Nanofluids flow over a permeable unsteady stretching surface with non-uniform heat source/sink in the presence of inclined magnetic field
Journal of the Egyptian Mathematical Society - Tập 27 - Trang 1-26 - 2019
This work analyzes the unsteady two-dimensional nanofluid flow over a vertical stretching permeable surface in the presence of an inclined magnetic field and non-uniform heat source/sink. Four different types of nanoparticles, namely silver Ag, copper Cu, alumina Al2O3, and titania TiO2, are considered by using water as a base fluid with the Prandtl number Pr = 6.785. The governing partial differe......
Bivariate general exponential models with stress-strength reliability application
Journal of the Egyptian Mathematical Society - Tập 28 - Trang 1-15 - 2020
In this paper, we introduce two families of general bivariate distributions. We refer to these families as general bivariate exponential family and general bivariate inverse exponential family. Many bivariate distributions in the literature are members of the proposed families. Some properties of the proposed families are discussed, as well as a characterization associated with the stress-strength......
Analytical bifurcation behaviors of a host–parasitoid model with Holling type III functional response
Journal of the Egyptian Mathematical Society - Tập 31 - Trang 1-22 - 2023
This topic presents a study on a host–parasitoid model with a Holling type III functional response. In population dynamics, when host density rises, the parasitoid response initially accelerates due to the parasitoid’s improved searching efficiency. However, above a certain density threshold, the parasitoid response will reach a saturation level due to the influence of reducing the handling time. ......
The periodic rotary motions of a rigid body in a new domain of angular velocityAbstract In the previous works, the limiting case for the motion of a rigid body about a fixed point in a Newtonian force field, which comes from a gravity center lies on Z -axis, is solved. The authors apply the small parameter technique which is achieved giving the body a sufficiently large angular velocity component r...
Journal of the Egyptian Mathematical Society - Tập 29 Số 1 - 2021
Dynamics and chaos control in a discrete-time ratio-dependent Holling-Tanner model
Journal of the Egyptian Mathematical Society - Tập 27 - Trang 1-16 - 2019
A discrete-time Holling-Tanner model with ratio-dependent functional response is examined. We show that the system experiences a flip bifurcation and Neimark-Sacker bifurcation or both together at positive fixed point in the interior of $\mathbb {R}^{2}_{+}$ when one of the model parameter crosses its threshold value. We concentrate our attention to determine the existence conditions and direction......
Retraction Note: On projection-invariant submodules of QTAG-modules
Journal of the Egyptian Mathematical Society - Tập 27 - Trang 1-1 - 2019
The Editor-in-Chief has retracted this article [1] because the results have been previously published by Danchev and Goldsmith [2]. This article is therefore redundant. Fahad Sikander does not agree to this retraction. Alveera Mehdi and Sabah A.R.K. Naji have not responded to correspondence from the Publisher about this retraction.
Mathematical modelling of mantle convection at a high Rayleigh number with variable viscosity and viscous dissipation
Journal of the Egyptian Mathematical Society - Tập 30 - Trang 1-17 - 2022
In this paper, the classical Rayleigh–Bénard convection model is considered and solved numerically for extremely large viscosity variations (i.e., up to
$$10^{30}$$
) across the mantle at a high Rayleigh number. The Arrhenius form of viscosity is defined as a cut-off viscosity function. The effects......
The need for the fractional operators
Journal of the Egyptian Mathematical Society - Tập 29 - Trang 1-7 - 2021
In this review paper, I focus on presenting the reasons of extending the partial differential equations to space-time fractional differential equations. I believe that extending any partial differential equations or any system of equations to fractional systems without giving concrete reasons has no sense. The experiments agrees with the theoretical studies on extending the first order-time deriva......
Gần đúng các nghiệm chung cho bài toán điểm cố định của ánh xạ không mở rộng tiệm cận và bài toán cân bằng tổng quát trong không gian Hilbert Dịch bởi AI
Journal of the Egyptian Mathematical Society - Tập 27 - Trang 1-16 - 2019
Trong bài báo này, chúng tôi giới thiệu một thuật toán lặp để gần đúng một nghiệm chung của bài toán cân bằng tổng quát và bài toán điểm cố định cho một ánh xạ không mở rộng tiệm cận trong không gian Hilbert thực. Chúng tôi chứng minh rằng các chuỗi được sinh ra bởi thuật toán lặp hội tụ mạnh mẽ tới một nghiệm chung của bài toán cân bằng tổng quát và bài toán điểm cố định cho một ánh xạ không mở r......
#bài toán điểm cố định #ánh xạ không mở rộng tiệm cận #bài toán cân bằng tổng quát #không gian Hilbert #thuật toán lặp
Nonstandard theta Milstein method for solving stochastic multi-strain tuberculosis model
Journal of the Egyptian Mathematical Society - Tập 28 - Trang 1-16 - 2020
In this article, a novel stochastic multi-strain tuberculosis model is presented. Numerical simulations for this model are the main aim of this work. A non-standard theta Milstein method is constructed to study the proposed model, where the proposed method is based on choosing the weight factor theta. The main advantage of this method is it can be explicit or implicit with large stability regions ......
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