C hemistry is an ever expanding ‘‘universe’’ at the microscopic level requiring mastery of the invisible at ever increasing levels of complexity. Starting with atoms, assemblies of a single nucleus and orbiting electrons, the chemist has learned to understand atomic structure through mastery of the principles of electronic configurations. Proceeding to molecules, assemblies of two or more atoms...

In this study we present a numerical simulation for droplet spreading and evaporation on flat surfaces and in a semi-confined geometry. The model takes into account some of the coupled dynamics between the liquid and gas phases in an attempt to develop a coupled model for mass, energy and momentum transport. The dynamics of the liquid droplet are modelled using the lubrication framework and inc...

Geometrical models are mostly used for the study and analysis of the characteristics of radio communication channels. In this paper, a three-dimensional semi-ellipsoidal scattering model is proposed for mobile-to-mobile communication channels, where uniformly distributed scatterers are assumed to be confined within the semi-ellipsoids around mobile stations. The semi-ellipsoidal shape with adju...

We study the excitonic effects on the second-order nonlinear optical properties of semi-spherical quantum dots considering, on the same footing, the confinement potential of the electron-hole pair and the Coulomb interaction between them. The exciton is confined in a semi-spherical geometry by means of a three-dimensional semi-parabolic potential. We calculate the optical rectification and seco...

The Lattice Boltzmann (LB) method has been shown to be a highly efficient numerical method for solving fluid flow in confined domains such as pipes, irregularly shaped channels or porous media. Traditionally the LB method has been applied to flow in void regions (pores) and no flow in solid regions. However, in a number of scenarios, this may not suffice. That is partial flow may occur in semi-...

The increasing trend in borehole failures and the general decline groundwater levels yields due to climate change mostly semi-arid regions such as Damaturu Yobe State, needs an urgent intervention order sustain provision of quality drinking water populace. In this study, we investigated potential New Jerusalem Damaturu, using electrical resistivity method. results obtained showed that study are...