Abstract: The microstructure of the base alloy and thermomechanical affected zone (TMAZ) of inertia friction welded powder metallurgy (PM) RR1000 were examined by the use of stan'dard metallograpllic tecl~niques involving optical. analytical scanning and msrnission elmtron inicmsmpes equipped with enew dispersive spectrometer nnd an electron probe micro analyscr. It was discovered that liquation of grain boundary phases present in the pre-weld alloy resulted in the formation of eutectic type ...
ABSTRACT Plant biodiversity and ethnobotanical potentials of University of Agriculture Makurdi (UAM) Wildlife Park and Ikwe Games Reserve, Benue State, Nigeria, were investigated in this study. Floristic survey was conducted in the two reserves using stratified sampling technique based on the three identified microhabitats in each of the reserves. Nine plots measuring 25 m x 25 m were laid in each of the reserves to survey trees and shrubs with diameters at breast height (dbh) 5 cm and above....
Abstract The manufacture of abrasive grains in igeria has been severely impeded by the difficulty of identifying suitable local raw materials and the associated local formulation for abrasives with global quality standards. This paper presents a study on the formulation and manufacture of silicon carbide abrasives using locally sourced raw materials in igeria. Five local raw material substitutes were identified through pilot study and with the initial mix of the identified materials, a system...
ABstra& Mmy engheedng applidbw idhe problem cfa hielo ading pprp which is ojet: IIU~to lmck and criticrrl in design anrjysiz Tlis winch4@ de- Imming JO- developed in this work incorpamtes the gmphical display of djlnmnlc WingO PI the Enek or rope ~Jlltew inc11 Ifl within hef irst ssm& of fis opernd011T. he learning @am oUma tlts umr to gene- a profile of this load arid ia amelemtion agaimt time in order to obIain ihe humwh bs of the Iaard io be boms by wkde uniL IP~Lfmt~irse u nderplayed in n...
Abstract: The objective of this study is to investigate the influence of service situation on the mechanical properties of plain nails manufactured from low carbon steel. The influence of the degree of cold drawing on the mechanical properties and strain hardening of the material is investigated by tensile test experimentation. The stress-strain relationships of the cold-drawn low carbon steel were investigated over the 20, 25, 40 and 55% degree of drawn deformation for the manufacture of 4, ...
ABSTRACT Sand production is a major issue during oil and gas production from unconsolidated reservoirs. In predicting the onset of sand production. it is important to accurately determine the failure mechanism and the contributing parameters. The aim of this study wa to determine sand failure mechanism in the Niger-Delta. identify the major contributing parameters and evaluate their effects on sanding. Completion and production data from 78 strings completed on 22 reservoirs in a Niger Delta ...
ABSTRACT This paper presents the application of Artificial Neural Network (ANN) in modeling the heat transfer coefficient of a staggered multi-row, multi-column, cross-flow, tube-type heat exchanger. Heat transfer data were obtained experimentally for air flowing over a bank of copper tubes arranged in staggered configuration with 5 rows and 4 columns at different air flow rates with throttle valve openings at 10 - 100%. The Reynolds number and the row number were used as input parameters, wh...
ABSTRACT A biofiltration wastewater treatment pond was developed and the performance evaluation undertaken at the Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka, southeast, Nigeria. The biofiltration wastewater treatment system is made of three compartments comprising a wastewater storage unit, wastewater treatment unit and treated wastewater compartment. The compartments are of the same size with the following dimensions 0.61m x0.61m x 0.5m having a ...
ABSTRACT This work focused on Evaluating the Performance of the Unified Power Flow Controller (UPFC) on Fault Current Limitation in the Nigerian 330kV Power Network. The SIMULINK model of the Nigerian 330kV system was developed. The model of the UPFC was developed and integrated into the power system model. The proportional integral (PI) control parameters of the UPFC was optimized using genetic algorithm. Results from simulation carried out showed the versatility of the UPFC in the protecti...
ABSTRACT In this research work, Bioremediation technology was used to reduce the heavy contents of the soil collected from the bank of the sewage pond of the University of Nigeria Nsukka. The heavy metals were; zinc (Zn) cadmium (Cd) and lead (Pd). In the bioremediation process, fungi, bacteria and plants were used. The bacteria used were Bacillus cereus, the fungi used was Aspergillus fumigatus and the plant used was Bryophyllum pinnatum (life plant). The combinations of these organisms wer...
ABSTRACT With the growing demand for higher bandwidth multimedia services in a network domain over the past few years, Asynchronous Transfer Mode (ATM) has emerged as a fine solution. ATM provides mobility support for mobile users as they move among base stations. One of the key issues to support user mobility is the handoff. Efficient usage of network resources is also required. Most handover scheme like Mobile Motion Prediction (MMP) Algorithm and Hierarchical Position Prediction Algorithm...
Abstract Optimization of production downtime in plastic manufacturing serves as a method to minimize machine downtime. This paper describes how to minimize machine downtime using multiple regression analysis in Statistical Package for Social Sciences (SPSS) and graphs was also used to predict the effective of downtime to cycle time, weight, production capacity, overall equipment effectiveness (OEE) and graphs were plotted accordingly. The Overall Equipment Effectiveness (OEE) of the company w...
ABSTRACT Artificial Neural Networks (ANNs) area prormsing alternative to conventional tools in modeling and prediction of complex and non-linear parameters. However, the selection of appropriate network parameters for optimum performance pose application challenges In this study, the modeling and predictive performances of six backpropagation learning algorithms: Levenberg-Marquardt (LM), BFGS Quasi-Newton (BFG), Resilient Backpropagation (RP), Fletcher-Powell Conjugate Gradient (CGF), Variab...
ABSTRACT Carbon dioxide (CO2) emissions from solid wastes is a major contributor to the acceleration of global warming. In Nigeria, CO2 capture has been limited to the energy sector only. There is need to explore the reduction of CO2 emissions from solid wastes through appropriate technologies. This study, therefore was designed to assess CO2 extraction by adsorbents in a Municipal Solid Waste (MSW) management facility in Akure, Nigeria. An exploratory study design with an intervention compon...
ABSTRACT The study addresses the stability and control of nuclear systems with emphasis on the Supercritical Water Reactor (SCWR) as proposed in the Generation IV International Forum. The literature on the stability and control of the SCWR is presented. A Computational Fluid Dynamics code, STAR-CCM+, is used to study the flow stability problems in circular channels, fuel bundle slices with and without heating structures. Some of the effects of numerical discretisation, turbulence model effect...