ABSTRACT Ground gravity survey covering an area of 60km2 in Kimachia and Mbeu, area of Tigania- West Sub-County of Meru County, Kenya was conducted to establish iron ore extent in the area. A Sodin 410 gravimeter was used to measure the gravity field‟s variations in the 278 established stations. At each station the location coordinates and elevation were obtained using Global Positioning System, Garmin 45 model. The time of measurement at each station was also recorded. Gravity reducti...
ABSTRACT The somatic and genetic effects of 2.45 GHz Microwave radiation (MWR) on male and female Sprague Dawley rats were studied. Two hundred rats were used for this study. They were grouped into control and exposed according to the parameters under consideration. The animals were exposed to various levels of specific absorption rate (SARs) using the microwave generator, model ER660E, Serial No MX704CCR from Toshiba UK Ltd. All animals were kept in healthy, and radiation free environment w...
ABSTRACT A study of the two stable isotopes of helium at low temperature was done using statistical mechanics approach. It was assumed that pairs of ~He - iH e were formed creating a new particle in the mixture. Such a mixture exhibits quantum effects at temperatures close to 0 K. A model of pair interaction was used. The partition function of the mixture was used in establishing the chemical potential of the mixture. The case of a particle in a cube of known volume was used. An expression of...
ABSTRACT This thesis highlights the role that transionospheric radio propagation (with particular interest on global positioning system (GPS)) plays in enhancing aviation safety. The ionosphere over equatorial latitudes is characterized with high dynamics (irregularities) that may challenge the performance of transionospheric radio system, especially on phenomenal days. The objectives of this work are to: investigate how ionospheric irregularities grow and evolve, and thereafter assess their ...
Abstract-The importance of recrystallization kinetics in metal process cannot be over emphasized in providing information as to the control of microstructure of materials for purpose of improving or impacting desired mechanical properties in processed materials. In this study, 0.12wt% C steel cold drawn between 20% - 55% were graduallyheateduptoatemperatureof900°C followed bysoakingtreatment between 600 seconds and 3600 seconds in a Gallenkomp® mufflefurnace model SVL-1009 with voltage regu...
ABSTRACT This thesis presented the surface modification of polydimethyl siloxane (PDMS) to enhance surface wettability and surface roughness. Physical and chemical modifications were performed on cured surfaces of PDMS and PDMS-based nanocomposites. Firstly, physical modifications were done by direct coating of PDMS-based substrates with biopolymers such as polyethylene glycol (PEG), poly lactic-co-glycolic acid (PLGA) and sodium alginate (SA). On the other hand, coatings were done with the ...
ABSTRACT Ground State structures of neutral Copper clusters CuN=3−6 were generated and optimised within the framework of the Density Functional Theory (DFT) using Generalised Gradient Approximation (GGA) and ultrasoft pseudopotential. The shapes and binding energies of the clusters obtained showed good agreement with other theoretical works, except for the trimer cluster which has the shape of an equilateral triangle rather than the isosceles triangle as reported in previous works. The opti...
Abstract Human body responds to physical activities, external temperature, external magnetic field, and other factors by homeostatically adjusting its blood flow in order to deliver nutrients such as oxygen and glucose to every organ in the body and allow them to function. Complications in this hemodynamic may arise due to acute coronary syndromes such as stenosis or arteriosclerosis leading to obstruction of coronary arteries. These complications do cause a change in the blood flow to the b...
Abstract The study explores the potential effects of the remote application of cyclic magnetic field to the female anopheles mosquitoes that carry malaria parasites. The goal is to develop a theoretical basis that can guide the cyclic activation of the magnetic field to induce the inactivity of the malaria parasite without killing the mosquitoes. The model considers the hemozoin within the malaria parasite as a cluster of magnetic nanoparticels. The potential effects of the applied magnetic ...
ABSTRACT We have studied a model for a non-collinear but coplanar antiferromagnetic spin texture on a two dimensional kagome lattice structure in the presence of DzyaloshinskiiMoriya Interaction (DMI). We observed some interesting topological properties in our system i.e. the presence of non-trivial edge state in the wave function. This non-trivial edge state, which mainly surfaced in the presence of the DMI, showed robustness against the external magnetic eld and thus can be further studied ...
ABSTRACT The development of inexpensive, non-toxic, high efficiency and earth-abundant solar absorbers is critical for terawatt scale implementation of photovoltaics. Cu2SnS3 is a promising earth abundant absorber material that is attracting attention recently for optoelectronic application including photovoltaic solar cells. However, very little is known about the relationship between structural and optical properties such as the absorbance, reflectivity, refractive index, extinction coeffic...
ABSTRACT Since the appearance of the first wind turbines at the end of the nineteenth century, wind energy has been considered to be a renewable energy source for not just developed countries but also developing countries as well. Thus, since 2004, there has been a steady rise in wind energy production worldwide, with substantial actively installed capacity in Africa. However, due to the fact that wind turbines are highly dynamic systems that are excited by stochastic loads from the wind, var...
ABSTRACT In this thesis, we present a theoretical study on the current-induced nucleation and propagation of antiferromagnetic skyrmionium. A skyrmionium, also known as 2π-skyrmion, is a vortex-like magnetic structure characterized by zero topological charge. We show by means of micro-magnetic simulation that an antiferromagnetic skyrmionium can be nucleated via a local injection of spin current with toroidal distribution. Our systematic study of the current-induced dynamics shows that a sp...
ABSTRACT Studies of physico-mechanical and morphological properties of pure and -cellulose reinforced blends of polystyrene (PS) and poly (vinyl acetate) (PVAc) are reported in this work. The compression moulded articles of the blends of different compositions (10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80:20 and 90:10, PS/PVAc) were tested for mechanical performance, absorption behaviour, void activity and morphological arrangements. Comparison of mechanical properties such as tensi...
ABSTRACT Combination-control of two or more systems which may have important application in Josephson junction ratchet array, and other physical systems has not been explored. Most of the theoretical framework is on combination synchronization, and the need for combination tracking control. In this paper tracking control of 2-D Duffing oscillator, 3-D Lorenz-Stenflo, 4-D Lorenz-Stenflo systems, as well as combination-tracking control of two, three, four and five systems evolving from differe...