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...
ABSTRACT This study was carried out to solve problems associated with low groundwater pH encountered by poultry farmers (using Owerri as a case study) which results to birds‟ mortality and low production of eggsand meat. Groundwater samples from different areas in Owerri were collected from boreholes for characterization using standard methods and the pH values were assessed. The results showed that pH of groundwater in the study area ranged from 4.8 to 5.8 through dry and ...
ABSTRACT The inhibitive strength of Canonamuricata (CM) and Cassuttidfilifurmis (CF) on mild steel dissolution in 0.5 M H 2 SO 4 and 1 M HCl environment was studied using gravimetric and electrochemical techniques. The results obtained indicate that all studied extracts of both plants are adsorption type inhibitors hence; t he adsorption of the inhibitors is in line with Langmuir adsorption isotherm. Efficiencies of the inhibitors increased with an increase in concentration of the extract but...
ABSTRACT Short circuit modelling and parameter extraction of a synchronous generator entails development of a mathematical model of three phase short circuit of a turbo generator and the study of its characteristics or envelops at short circuit under constant speed and saturated conditions.. The transient parameters have a significant impact on the magnitude of the fault currents generated within the machine during an event such as a 3 phase short-circuit. Power system designers routinely use...
ABSTRACT This research work presents Nonlinear Analysis of Isotropic Thin Rectangular Plates using Energy Principle (Ritz method). Isotropic thin Rectangular plate having different twelve boundary conditions were analyzed and these boundary conditions were formed by combination of three major supports – Clamp, C; Simply supported, S; and Free, F. With this combination, the twelve boundary conditions analyzed include: SSSS, CCCC, CSCS, CSSS, CCSS, CCCS, CCFC, SSFS, CCFS, SCFC, CSFS, and...
ABSTRACT Powdered Cassia Siamea leaves were investigated as a possible corrosion inhibitor for mild steel in 2 M HCl. Terephthal amide obtained from depolymerizing waste PET (Polyethylene terephthalate) bottles through aminolysis using mono ethanol amine (MEA), served as an additive to improve the efficiency of the powdered leaves. The plant inhibitor was prepared by dissolving 1.5 g of the powdered leaves in 300 ml of 2 M HCl and boiled for 3 hours. Corrosion rates of the steel samples were ...
Abstract: This paper presents the results of a mathematical model developed for predicting the 28-day compressive strength of foamed aerated concrete containing pulverised bone as partial replacement of cement for the purpose of quality controls. Strength-porosity relation was used as a basis for the development of the model, and the Bisection Methods of Numerical analysis was used to evaluate the inherent constants. For all the percentages of cement replacement with pulverised bone, the exp...