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Title: Propagation of Waves in a Semiconductor Nanostructures Media
Authors: Ali, Hashmat
Keywords: Physical Sciences
Issue Date: 2021
Publisher: COMSATS University, Islamabad.
Abstract: Propagation of Waves in a Semiconductor Nanostructures Media The propagation of waves in semiconductor nanostructures is investigated in this thesis. The coupled nonlocal elasticity theory and a three phase lag model are used to study the propagation, reflection and transmission of elastic and thermoelastic wave in the medium. The effects of the rotation, porosity and temperature are also analyzed. Rotation and voids have significant effects on the speed of waves. The propagation of waves in rotating medium is of great significance due the fact that most of the medium in the real life like the Earth, the Moon rotate about their own axes with some particular angular frequency. Thermoelastic solids containing voids are commonly used in different categories of materials like geological, biological and synthetic in both structural and functional forms. The well known properties of the porous solids are low relative density, high specific strength and surface area, lightweight, thermal and acoustical insulation, and good permeability. Due to these characteristics, the permeable solids have major applications in aerospace, electronic communications, structural engineering, metallurgy, and nuclear energy, petrochemical, mechanical, medical, and environmental protection. Taking cognizance of this fact the analysis of rotational effects on the waves in the porous and non-porous medium is then investigated. The concept of reflection and refraction of various types of the waves striking with the boundary between two different types of the medium is very important in many fields like geophysics, the study of seismic waves propagation and in composites engineering etc. The rotational effects on reflection and transmission of thermoelastic waves in the permeable medium are also explored. Study of waves in semiconductor nanostructures has variety of applications in the field of electronics, biological systems and optical communications. Semiconductor nanostructures play a significant role in different devices, e.g., solo electron transistors, solar cells, lasers and biological label. The nonlocal elasticity theory and generalized Hook’s law are used to mathematically model the problems. The coupled system is resolved into longitudinal and transverse components using the Helmholtz decomposition method. Boundary conditions are used to find the reflection and transmission coefficients of xii the various reflected and transmitted waves for particular material. The results are presented graphically and explained physically. The effects of nonlocal, fractional order, temperature dependent parameters and rotational frequency on the results are discussed.
Gov't Doc #: 23663
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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