ABSTRACT This work presents a high resolution analysis of spatio-temporal variations of geomagnetic field using parallel computing. Geomagnetic field diurnal and hourly variation have been used extensively to study extant and emerging geophysical phenomena. Although, geomagnetic field variations occur even on nanosecond basis, however, to date, algorithm development and computing hardware architecture limit the resolution of monitoring solar quiet (Sq) daily variation to hourly and regional ...
ABSTRACT This thesis develops a generalized formulation, based on the electromagnetic potential theory and the thin-wire concept, of the radiation problem,
ABSTRACT Glutathione Peroxidase (GPx) family of enzymes plays important roles in the protection of organisms from oxidative damage. GPx converts reduced glutathione (GSH) to oxidized glutathione (GSSG) while reducing lipid hydroperoxides to their corresponding alcohols or free hydrogen peroxide to water. This study was conducted to investigate the possible effects of temperature in vivo on Glutathione peroxidase (GPX) oxidative activity in fish tissues.An adult fully grown cat fish, (the ...
ABSTRACT This work studied the buckling analysis of plates subject to biaxial forces using the Galerkin’s method. Twelve boundary conditions were considered. The plate deflection equations were obtained using the polynomial series, and from the plate deflection equations, the expression for the critical buckling loads of the different plate boundary conditions were obtained for different aspect ratios, ∝ using the Galerkin’s functional. The aspect ratios, considered throughout this wo...
CHAPTER ONE INTRODUCTION 1.1 BACKGROUND OF STUDY Buckling analysis of isotropic rectangular plate has been a subject of study in solid structural mechanics for more than a century. Many exact solutions for isotopic plates have been developed. Steel rectangular plates are widely used in buildings, bridges, automobiles, and ships. Rectangular plate has width size comparable to size of their lengths and so is modeled as two - dimensional plane members unlike beams and columns. Under compress...
ABSTRACT Investigations were carried out to determine the corrosion effect of sulphur-reducing bacteria on mild and medium carbon steels. Specimens were exposed to anaerobic, aerobic and distilled water environments. The corrosion rates were evaluated at intervals of seven days using weight loss and electro-chemical methods for a period of forty two days. The specimens were also subjected to visual examination and the result indicated uniform corrosion in all the environments. In all the env...
ABSTARCT Fe-Ni-Cr alloys are commonly used as pressure vessel (in-core) materials for nuclear reactors and have been classified as candidate materials for Supercritical Water-Cooled Reactors (SCWR). In service, the in-core materials are exposed to harsh environments: intense neutron irradiation, mechanical and thermal stresses, and aggressive corrosion prone environment which all contribute to the components’ deterioration. For better understanding of the mechanisms responsible for degradat...
ABSTRACT The inclusion of an additional safety rod in conjunction with a core conversion study of Ghana Research Reactor-1 (GHARR-1) was carried out using neutronics, thermal hydraulics and burnup codes. The study is based on a recommendation by Integrated Safety Assessment for Research Reactors (INSARR) mission to incorporate a safety rod to the reactor safety system as well as the need to replace the reactor fuel with LEU. Conversion from one fuel type to another requires a complete re-eval...
ABSTRACT The pebble bed type of high temperature gas cooled nuclear reactor is a promising option for next generation reactor technology and has the potential to provide high efficiency and cost effective electricity generation. The reactor unit heat transfer poses a challenge due to the complexity associated with it. In the pebble bed, heat is generated in kernels inside the fuel sphere. The generated heat is conducted to the sphere surface where it is transferred to the coolant (helium ga...
ABSTRACT This work investigated the anaerobic digestion of cow-dung and cassava peels, the effect of co-digestion in biogas production and purification process for biogas upgrade. The biogas experiments were carried out in five different anaerobic digesters which contained cow-dung and cassava peels slurry in the (wt-wt%) ratios of (100:0), (75:25), (50:50), (25:75), (0:100) and were incubated for a 30-day period at ambient temperature. Combined absorption and adsorption process was used to p...
ABSTRACT The project research entailed the production of high quality sealant incorporating a local raw material for sealing holes and gaps in various materials like metal and plastic. Two samples of acrylic sealants were produced, the first samples which is the standard formulations involved the use of silica gel as a major adhesion promoter and the second samples which is the research formulations involved the use of sand (sharp colourless sand with 59% silica/silicondioxide composition)) a...
ABSTRACT Pausinystalia yohmibe is a member of thefamilyRubiaceae. It is a valuable medicinal tree, distributed in evergreen closed canopy forests in West Africa. It is traditionally used for treatment mostly on erectile dysfunction. This research was carried out to evaluate the immunomodulatory effect of (Pausinystalia yohmibe) stem bark methanolic extract. The yohimbe extract has been reported for its medicinal use for the treatment of impotence in men and for its anti-oxidants effects bu...
ABSTRACT Before the exploitation of groundwater in a region, it is usually necessary to determine the hydraulic characteristics which allow the flow of water through aquifer and the amount of water that aquifer yields to well due to compression or dewatering of the aquifer. Hydrogeological work was carried out to characterize the aquifers of Afikpo-North L.G.A., Southeastern Nigeria. The study area lies within the lower Benue Trough of Nigeria and is underlain by Turonian Ezeaku Formation ...
ABSTRACT This thesis investigates into the real time modeling of leak estimation in natural gas pipeline using fluid flow approach. The best bet to leak management is to provide a robust system that will provide a quick information on tracking the leak location, the actual time this leak occurred and the volume of fluid loss. This thesis employed a mathematical model of analyzing the fluid flow in the pipeline to provide these solutions of leak estimation in a natural gas pipeline which is...
ABSTRACT The process of lifting items like motor vehicles and farm tractors for the purpose of changing tyres and other maintenance activities usually involves extensive manual effort and high risk of injuries. In other to reduce the manual effort and the risk of injuries, a remote controlled jack is developed and tested. The equipment consists of a 5-tonne capacity hydraulic jack, and a drive and control system which comprises a 12 volts, 312 Watts d c electric motor, a sliding crank mech...