Dr. Ethar A. Abdel Salam

Assistant Professor

Faculty Building

UB1

Office Number

307

Bio

Biography

Dr Ethar Ahmed is an assistant professor in the School of Engineering and applied sciences at Nile University. She obtained her PhD in applied mathematics from Cairo University in 2020 where she studied thermo-Piezo Elasticity of Continuous Media with Microstructure, within the Frame of Extended Thermodynamics. Prior to her PhD, she obtained her BSc. in special Mathematics from the faculty of science, Al-Azhar University and her MSc in applied mathematics from the faculty of Science at Zagazig University. Dr Ethar research interests center around continuum mechanics and thermoelasticity. She has more than 17 peer reviewed research articles published in top-tier journals and she has been serving as a reviewer in the top journals of the field. During the summer of 2023, she was a visiting researcher in the Electrical Engineering Dept. at Stanford University where she worked on developing a theoretical model for transparent piezoelectric transducers for neuron stimulation applications. She has participated in several scientific conferences including the 8th International Scientific Conference (Environment, Development and Bioinformatic), the 8th International Conference on Mathematics and Information Sciences and the International Mathematics Day- Mathematics for Development. Dr Ethar teaches several core undergraduate courses at Nile University and has been an active member in many student research activities. She served as a jury member in the Egyptian Junior Researcher Competition and she mentors and guides the next generation of researchers and engineers develop creative projects and publish their work in conferences and scientific journals. She is also a member of the Egyptian Mathematical Society and the Egyptian Women in Mathematics society.

Achievements

Dr. Ethar won Obada Prize 2020 for Distinguished Students.
She won the Best Ph.D. Thesis Award in "Applied Mathematics" from the Egyptian Mathematical Society for the year 2021.
She also won the Best Research Award for Egyptian Young Researchers at the Fourth International Conference for Mathematics and its Applications, 2021.

Recent Publications

Abstract: In the context of the three-phase hysteresis model (3PHL), a system of equations is established for a generalized thermoelastic medium under the influence of a magnetic field and an internal heat source. The problem is discussed using Eringen’s nonlocal elastic model. The exact expression of the physical quantity is obtained by normal mode analysis and illustrated graphically by

An efficient numerical approach based on weighted-average finite differences is used to solve the Newtonian plane Couette flow with wall slip, obeying a dynamic slip law that generalizes the Navier slip law with the inclusion of a relaxation term. Slip is exhibited only along the fixed lower plate, and the motion is triggered by the motion of the upper plate. Three different cases are considered

Plane, nonlinear Rayleigh wave propagation is investigated in a three-layer sandwich structure of a thermoelastic medium, within the frame of dual-phase-lag theory. The thermal conductivity is taken as a linear function of temperature. This induces nonlinearity in the evolution equations for the heat flux components. A particular solution is found in the form of Poincaré expansion in a small

The model of generalized thermoelasticity, with the dual-phase-lag theory (DPL), is applied to study the influence of gravity on a piezo-thermoelastic diffusive medium. Normal mode analysis is used to obtain the exact expressions for different physical quantities. The derived expressions are computed numerically and the results are presented in graphical form. Comparisons are made with the results

We investigate a one-dimensional restriction of a nonlinear model of thermo-electroelasticity in extended thermodynamics and in the quasi-electrostatic regime (see Ghaleb et al. in Int J Eng Sci 119:29–39, 2017. https://doi.org/10.1016/j.ijengsci.2017.06.010). An additional dependence of the thermal conductivity and the thermal relaxation time on temperature and heat flux is introduced. The aim of

A 2D first order linear system of partial differential equations of plane strain thermoelasticity within the frame of extended thermodynamics is presented and analyzed. The system is composed of the equations of classical thermoelasticity in which displacements are replaced with velocities, complemented with Cattaneo evolution equation for heat flux. For a particular choice of the characteristic

The model of generalized thermoelasticity, dual-phase-lag model (DPL), is applied to study the influence of gravity on a piezo-thermoelastic diffusive medium. Normal mode analysis is used to obtain the expressions for different physical quantities. The derived expressions are computed numerically and the results are presented in graphical form. Comparisons are made with the results predicted by

The current work is concerned with the study of wave propagation in a half-space of a piezo-thermoelastic material under a bias tangential magnetic field within dual-phase-lag (DPL). This is relevant to the design and performance of piezoelectric devices working under a bias magnetic field, for example, the DC magnetic field piezoelectric sensors widely used in various areas of technology. The

We investigate linear, thermoelastic wave propagation in a layered piezoelectric material composed of a slab bonded to a half-space substrate of a dissimilar material, within dual-phase-lag model and under thermomechanical loads. One of the aims of the present work is to formulate a set of boundary conditions that is compatible with the field equations. Normal mode technique is used to obtain a

Grants

Projects

Research Project

One-dimensional nonlinear model of generalized thermo-electro elasticity.

Abstract We investigate a one-dimensional nonlinear model of thermo-electroelasticity in extended thermodynamics and quasi-electrostatic regime, with thermal conductivity and relaxation time dependent on temperature and heat flux. The aim is to assess the effect of quadratic nonlinear couplings between mechanical, thermal, and electric fields, known to impact solution stability. Two wave

Research Project

Piezoelectric energy harvesting in renewable energy applications, mathematical foundation, and implementation.

Abstract In the present project, we develop a novel mathematical model for a hybrid piezo-BWT energy harvesting that will be coded, implemented, and tested through the project lifetime. This goal can be achieved in six phases that are described in the present section. Fund STDF