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...
ABSTRACT Over the last two decades, several materials such as metals, polymers and composites have been used as implants in the body. Metallic implants have proven to cause stress shielding, toxic corrosion products and necessity for re-surgery. On the other hand, synthetic polymers possess poor stiffness and cause inflammation. The quest in making up for the disadvantages of these materials has culminated in a paradigm shift to the use of biodegradable and biocompatible polymers such as pol...
ABSTRACT This research presents Artificial Neural Network Model for the prediction of the Modulus of Elasticity of Concrete. Egbulonu (2011) equation derived from Scheffe’s (4, 2) simplex equation for predicting the Modulus of Elasticity (MOE) was used to generate 800 values. These data represent different values of Modulus of Elasticity (MOE) out of which, 571 values were selected randomly by the artificial neural network. From the selected values, 400 were used for training the network,...
ABSTRACT Ghana Research Reactor-1 core is to be converted from Highly Enrich Uranium (HEU) fuel to Low Enriched Uranium (LEU) fuel in the near future; a storage cask will be needed to store the HEU fuel. Notwithstanding the core conversion process, it is also important for the facility to have a storage cask ready when the fuel is finally spent to temporarily store the fuel until permanent storage is provided. Winfrith Improved Multigroup Scheme-Argonne National Laboratory (WIMS-ANL), REactor...
ABSTRACT Transmission Control Protocol (TCP) is the dominant transport protocol in the Internet and supports many of the most popular Internet applications, such as the World Wide Web (WWW), file transfer and e-mail. The recently developed advanced wireless networks, such as GPRS, are known to cause delay spikes in packet transfer which causes unnecessary TCP retransmission timeouts. In order to find solutions to this effect, packet losses across wireless links should be distinguished from ...
ABSTRACT The technology of solar water heating is an emerging field in Nigeria. Due to the epileptic power supply in Nigeria, other energy sources are being sought. This project involves the design and fabrication of a portable solar water heater. The design of the solar water heater was done using relevant equations to size the major components of the system. The materials for the components were then selected with consideration to the design calculations, machinability, market availability ...