Browsing Department of Physics & Materials Science by Title
Now showing items 1-20 of 145
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3-DIMENSIONAL MATHEMATICAL MODELLING OF TEMPERATURE DISTRIBUTION IN POROUS MEDIA
(Academic Publications, Ltd., 2011)An alternative method of the numerical solution of the heat equation is presented. A three-dimensional modelling approach is used in this paper rather than one or two dimensional models in order to account for the lateral ... -
Ab initio study of elastic properties of orthorhombic cadmium stannate as a substrate for the manufacture of MEMS devices
(Science Direct, 2021)The elastic properties of the orthorhombic cadmium stannate (Cd2SnO4) were investigated using density functional theory, applying both energy-strain relationship (which is found in the literature) and stress-strain ... -
Ab Initio study of the electronic and optical properties of hexagonal and cubic Ge2Sb2Te5
(African Review of Physics, 2015-04)The electronic and optical properties of hexagonal and cubic Ge 2 Sb 2 Te 5 have been calculated using the QUANTUM ESPRESSO and Yambo codes. The study has considered the variation of electronic band gaps with lattice ... -
Ab initio study of the structural, vibrational and thermal properties of Ge2Sb2Te5
(Imperial College Press, 2015-06-12)The structural, vibrational and thermal properties of hexagonal as well as cubic Ge2Sb2Te5 (GST) have been calculated from first principles. The relative stability of the possible stacking sequences of hexagonal GST has ... -
Ab initio study of the structural, vibrational and thermal properties of Ge2Sb2Te5
(International Journal of Computational Materials Science, 2015-05-12)The structural, vibrational and thermal properties of hexagonal as well as cubic Ge2Sb2Te5 (GST) have been calculated from first principles. The relative stability of the possible stacking sequences of hexagonal GST has ... -
ACCESSING PUBLIC TRANSPORTATION POLICIES FOR PERSONS LIVING WITH DISABILITIES IN KENYA
(International Journal of Social Sciences, 2019)Despite the fact that the constitution of 2010 has given priority to persons with disabilities with specific focus to bill of right, their right to movement is still curtailed in the public transportation sector system in ... -
Accurate Ab-initio calculation of elastic constants of anisotropic binary alloys: A case of Fe–Al
(Solid State Communications, 2022)The final formed phases of alloys are functions of the chemical compositions of the mixture. The overall mechanical moduli of the alloy are also functions of the phases present. Most of the previous computed elastic constants ... -
The Acoustic Wave Propagation Equation: Discontinuous Galerkin Time Domain Solution Approach
(Hikari Ltd, 2019)This paper discusses a finite element method, discontinuous Galerkin time domain approach that solves the 2-D acoustic wave equation in cylindrical coordinates. The method is based on discretization of the wave field ... -
Acoustical properties of compressed earth blocks: Effect of compaction pressure, water hyacinth ash and lime
(Elsevier, 2023)This study assessed the potential use of a mixture of lime and water hyacinth ash (WHA) as binders in fabrication of cylindrical compressed earth blocks (CEBs) with good acoustic absorption properties for building and ... -
Acoustics of fractal porous material and fractional calculus
(MDPI, 2021)In this paper, we present a fractal (self-similar) model of acoustic propagation in a porous material with a rigid structure. The fractal medium is modeled as a continuous medium of non-integer spatial dimension. The basic ... -
Analysis of Loss Ratios Using a Mixed Linear Model
(University of Nairobi, 2008)Loss ratios have been employed by a broad range of users for diverse purposes. Insurance companies, regulators, investors, rating agencies, investment analysts, lenders and others have used the loss ratio for their particular ... -
Analytical Absorption Cross-Section for Photon by a Hydrogen 2s Atom
(IOP Publishing, 2011-04)We calculate the absorption cross-section for photon by a hydrogen 2s atom using the quantum-classical approximation for the total photo cross-section of many electron atoms. With the application of the first-order term ... -
Annealing efect on the structural and optical behavior of ZnO:Eu3+ thin flm grown using RF magnetron sputtering technique and application to dye sensitized solar cells
(Nature Publishing Group, 2020)Eu-doped ZnO (ZnO:Eu3+) thin flms deposited by RF magnetron sputtering have been investigated to establish the efect of annealing on the red photoluminescence. PL spectra analysis reveal a correlation between the ... -
Anomalous photovoltaic behavior under illumination of γ-In2Se3 nanostructures used as hole transport layer in organic solar cell
(Pergamon, 2022)Indium selenide is currently receiving tremendous attention in device application and studies related to two dimensional nanostructured technologies. Non-layered γ-In2Se3, which is a stable phase at room temperature, was ... -
Anti-Jaynes-Cummings interaction of a two-level atom with squeezed light: A comparison with the Jaynes-Cummings interaction
(Maseno University, 2022)We considered the anti-Jaynes-Cummings (AJC) interaction of a two-level atom in an initial ground state interacting with a field mode in an initial squeezed coherent state at arbitrary values of squeeze parameter r and ... -
The anti-Jaynes-Cummings model is solvable : quantum Rabi model in rotating and counter-rotating frames ; following the experiments
(Cornell University, 2021)This article is a response to the continued assumption, cited even in reports and reviews of recent experimental breakthroughs and advances in theoretical methods, that the antiJaynes-Cummings (AJC) interaction is an ... -
The benefits and challenges emanating from community policing in Kenya: A Criminological Perspective
(International Journal of Innovation and Scientific Research, 2014)Community policing is an integral component in ensuring that there is no insecurity in the community. More so, the Kenyan government in the Kibaki regime introduced the concept of community policing which was seen as ... -
Characteristics of psychiatric in-patients who engage in assualtive behaviour in Mathari Hospital, Nairobi
(University if Nairobi Research archive, 1991)Literature on assaultive behaviour by psychiatric in patients was reviewed. A total of 142 violent incidents perpetrated by 68 males and 74 female patients were studied over a period of 3 months. Of the total incidents of ... -
Comparative Investigation of Fullerene PC 71 BM and Non-fullerene ITIC-Th Acceptors Blended With P3HT or PBDB-T Donor Polymers for PV Applications
(Frontiers, 2021)Fundamentally, organic solar cells (OSCs) with a bulk-heterojunction active layer are made of at least two electronically dissimilar molecules, in which photoabsorption in one (donor) generates Frenkel excitons. The ... -
A comparison of the Laplace and the alternative multipole expansion series for the Coulomb potential
(Research Gate, 2023)Multipole expansion is a powerful technique used in many-body physics to solve dynamical problems involving correlated interactions between constituent particles. The Laplace multipole expansion series of the Coulomb ...
