ABSTRACT Cubic equations of state are commonly used for predicting the properties of reservoir fluids.' They are simple to use and require few parameters during computations. They have also been found to produce results that are comparable to the more rigorous multi-parameter equations. However, they are still regarded by many as mere comprehensive correlations of fluid properties because of a number of weaknesses and /imitations. This work addresses two weaknesses of cubic equations of state...
ABSTRACT This work investigated the possible use of Ushafa clay in Abuja, Nigeria as a suitable replacement for bentonite clay in foundry use. Moulding sand mixes with compositions of 8,10 and 13 % Ushafa clay, silica sand and 5, 7,8,9,10 and 11 % coal dust additives were mulled. From each mix, cylindrical specimens were prepared and subjected to permeability, shatter index, compression and shear strength tests. The results from the Ushafa mix were compared with results from Bentonite mixes....
Abstract Interest is growing daily on the utilization of bamboo as a reliable supplement to wood in furniture production to mitigate the scarcity of wood raw material supply. This study explored the viability of recycling bamboo recovered from scaffold into intermediate raw material for indoor furniture production. Strips were processed from the recovered Bambusa vulgaris Schrad and were subjected to conventional treatment methods with some modification to simplify the treatment. The durabil...
ABSTRACT In an attempt to meet the food demand by the ever increasing human population, the use of machines in the performance of agricultural operations is increasingly being emphasized. Two of the most common operations for which machines are used on the farm are ploughing and harrowing. Tractor operators who perform these functions are known to spend long period of time working with the machines and various implements which generate substantial noise. Exposure to excessive noise could be...
ABSTRACT Abrasive materials are materials of extreme hardness that are used to shape other materials by a grinding or abrading action and they are used either as loose grains, as grinding wheels, or as coatings on cloth or paper. A grinding wheel is made of very small, sharp and hard silicon carbide abrasive particles or grits held together by strong porous bond. The manufacture of silicon carbide abrasives and grinding wheel in Nigeria has been severely impeded by the difficulty of identifyi...
ABSTRACT This work investigated the effect of annealing, normalizing and quenching heat treatments on the microstructure of some chromium alloyed grey cast iron. Three sets of ten samples each having chromium contents of 0.5, 1.5 and 2.5% were heat treated above the upper critical temperature, to austenitizing temperatures (800oC, 850oC, 900oC) for one hour each and then annealed, normalized and water quenched. Metallographic analyses of the heat treated samples were done. The results showed ...
Abstract The influence of calcium chloride (CaCl2 ), magnesium chloride (MgCl2), hot-and cold-water pre-treatments, and prolonged storage on the hydration behaviour of particles extracted from Calamus deerratus and Laccosperma secundiflorum rattan canes mixed with cement was investigated. While the untreated rattans inhibited cement setting, pre-treatments generally improved compatibility. The addition of chemical additives and aqueous pre-treatments enhanced the compatibility of the rattan-...
ABSTRACT The work presented in this paper is on the preliminary design and fabrication of an automated whiteboard cleaner. The objective here in is to reduce the man-power involved in cleaning white boards after use. Though the use of smart boards is increasing, many institutions in the developed and developing world still make use of white boards. The Autodesk software was used for the CAD drawing and thereafter the design analyses and fabrication were done. The auto-board was designed to be...
ABSTRACT Mathematics has diverse applications as decision making tool. This study investigated the use of a proposed pure mathematical formulation (is. excluding human factor) for citing appropriately the location of political capital city an inhabited designated area.
ABSTRACT Lack of affordable, efficient, and user friendly inventory management tools, for adequate planning has been identified as a major cause of the high inventory cost in many Nigerian manufacturing firms. This study focuses on the development of a Materials Requirements Planning (MRP) that can be used by the local industries for inventory management in a job shop manufacturing environment. Four types of lotsizing techniques were analyzed and MRP algorithms developed for each of these lot...
ABSTRACT Titanium alloy (Ti-6Al-4V) can be economically machined with high-pressure coolant (HPC) supply. In this study, an artificial neural network (ANN) model was developed for the analysis and prediction of tool wear parameters when machining Ti-6Al-4V alloy with conventional flow and high-pressure coolant flow, up to 203 bar. Machining trials were conducted at different cutting conditions for both rough and finish turning operations with uncoated carbide (K10 grade) and double TiAlN/TiN,...
ABSTRACT The toll of climate change on the Nigerian agricultural system in recent times has resulted in the decline of agricultural production constituting a threat to food security. There is therefore an urgent need for strategies to reverse the situation and greenhouse farming is contemplated as a possible option. Towards the successful adoption of this strategy, a survey was conducted using Oyo State as a case study to establish the present status of the use of greenhouses in the region. A...
ABSTRACT Irvingia gabonensis and Irvingia wombolu are species of bush mango commonly found in Africa whose kernel are processed into soup. Literature generally abounds on the nutritional composition of the fruits and kernel but there is dearth of information on the engineering properties which are very important in the design of processing equipment and machines. This study was designed to investigate the influence of moisture on some engineering properties of seeds and kernels of I. gabonen...
ABSTRACT The moduli of elasticity and rupture and the energy to cause failure under impact load of the oil palm trunk were determined.
Abstract Cowpeas were prepared into flour by wet dehulling, wet milling into paste and drying; wet dehulling, drying and milling; and wet dehulling, wet milling and foam mat drying. Proximate chemical composition and functional properties (water and fat absorption capacities, foaming capacity, foam stability, bulk density, gelation capacity and emulsification capacity) of flours and of paste prepared by wet dehulling, wet milling and no drying, were determined. Akara from fresh paste and pas...