Afrika Matematika
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Propagation of thermoelastic plane waves at an imperfect boundary of thermal conducting viscous liquid/generalized thermoelastic solid
Afrika Matematika - Tập 25 - Trang 81-102 - 2012
The reflection and transmission of thermoelastic plane waves at an imperfect interface between a thermal conducting viscous-liquid and generalized thermoelastic solid half-space has been investigated. The amplitude ratios of various reflected and transmitted waves are obtained for an imperfect boundary. Particular cases of normal stiffness, transverse stiffness, slip and welded boundaries are dedu......
A thermoviscoelastic contact problem with friction, damage and wear diffusion
Afrika Matematika - Tập 34 - Trang 1-17 - 2023
In this paper we present a model for quasistatic frictional contact between a thermoviscoelastic body and a moving foundation that involves wear of contacting surface and diffusion of wear debris. The damage effect is taken into account in the thermoviscoelastic constitutive law, its evolution is described by a parabolic inclusion with the homogeneous Neumann boundary condition. Contact is modeled......
Mixed convection flow in a vertical tube filled with porous material with time-periodic boundary condition: steady-periodic regime
Afrika Matematika - Tập 26 - Trang 529-543 - 2014
An analytical study is reported on the hydrodynamic and thermal behaviour of a fully developed mixed convective flow in a vertical tube filled with isotropic porous material having time-periodic boundary condition. The analysis is performed for fully developed parallel flow and steady-periodic regime. The momentum and energy equations presented in dimensionless form along with the constraint equat......
On special type-2 Bishop motion and Bishop Darboux rotation axes of the space curve
Afrika Matematika - Tập 28 - Trang 1349-1355 - 2017
We have given a generalization of one parameter special Frenet motion to type-2 Bishop motion in Euclidean 3-space
$$E^3$$
. Type-2 Bishop motion have been defined for space curve
......
Existence of entropy solutions for some anisotropic quasilinear elliptic unilateral problems
Afrika Matematika - Tập 28 - Trang 357-378 - 2016
In this work, we consider the following quasilinear elliptic unilateral equations of the type
$$\begin{aligned} -\sum _{i=1}^{N}\frac{\partial }{\partial x_{i}}a_{i}(x,u,\nabla u) = \mu - \text{ div } \phi (u)\quad \text{ in } \Omega . \end{aligned}$$
......
Vague semiprime ideals of a $$\Gamma $$ -semiring
Afrika Matematika - Tập 29 - Trang 425-434 - 2018
The concept of vague semiprime ideal of a
$$\Gamma $$
-semiring with membership and non-membership functions taking the values in unit interval of real numbers are introduced and investigated some results.
Bitopological spaces in the context of pythagorean fuzzy set
Afrika Matematika - Tập 33 - Trang 1-8 - 2022
In this paper, we introduce pythagorean fuzzy bitopological space by extending pythagorean fuzzy topological space. Pairwise pythagorean fuzzy closed set, pairwise pythagorean fuzzy open set, pairwise pythagorean fuzzy closure, pairwise pythagorean fuzzy interior are introduce and studied their properties. Further, we introduce pythagorean fuzzy supra topological space and then investigated relati......
On rough Quasi- $$\Gamma $$ -hyperideals in $$\Gamma $$ -semihypergroups
Afrika Matematika - Tập 26 - Trang 303-315 - 2013
In this paper, we introduced the concept of rough
$$(m,n) $$
quasi-
$$\Gamma $$
-hyperideals i......
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