Abstract Surface tension is an important property that affects the behavior and characteristics of reservoir fluids.. It impacts the capillary pressure and fluid dynamics in porous media. This study, investigated the surface tension of Contaminated Niger Delta crude oil at varying temperatures. Laboratory tests were carried out on samples from four fields in the Niger Delta using DuNouy Tensiometer under standard conditions. The results show that for Niger Delta Crudes of gravity between 25 ...
ABSTRACT A previous paper on developing a national capability for the manufacture of activated carbon from agricultural waste by the same authors was considered. In the said paper, the process flow diagram for the manufacture of Granular Activated Carbon from three agricultural wastes namely coconut shell, oil-palm shells and sugarcane bagasse was provided and the plant’s economic analysis done. The objectives of this study were to investigate selling price reducing options and profitabilit...
Abstract Scheduling models based on efficient resources utilization without sufficient consideration for customer satisfaction or vice-visa is inadequate in many real-life multi-criteria scheduling problems. This work was aimed at the development of a bi-criteria algorithm for the simultaneous optimization of Makespan (Cmax) and Number of tardy jobs (NT) in a single machine problem with Sequence dependent set-up time. An existing single criterion algorithm, the Set Sequencing Algorithm, was ...
Abstract The design and construction of a flat plate solar collector is presented in this paper. The solar collector was designed to power adsorption refrigerator using activated carbon/methanol pair. Design was such as to provide simplicity and yet ruggedness for harsh operating environment in the tropical climate of Nigeria. For methanol desorption, the collector must reach a maximum temperature of at least 100"C. Performance results showed that the maximum temperature of 10aoC attained in ...
ABSTRACT Poultry production is one of the major contributors to global environmental degradation. Currently, livestock raised for meat uses about a third of global ice-free terrestrial land and produces 18% of global greenhouse gas (GHG) emissions. This is more than ·the global transportation sector (FAO, 2006). Livestock production is also one of the mail). drivers of deforestation and degradation of wildlife habitats. Due to increasing population size and per capita meat consumption 'in th...
ABSTRACT This study investigated the relationship between velocity of sound and properties of natural gases under different equations of state and the operational implications on acoustic gas metering. The velocity of sound was related to the thermodynamic properties of natural gas using both the Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) equations of state and applied to 5 wet and 5 dry natural gas samples from the Niger Delta at different conditions of temperature and pressure. Predic...
ABSTRACT Low cost and minimum emission of green house gases are two of the key advantages of using agricultural wastes as fuel in a bubbling fluidized bed combustor; however this advantage could be neutralized if significant cost and energy is spent on processing prior to usage of the waste, therefore if processing stage could be circumvented without compromising effectiveness and efficiency, a substantial operational cost saving could be achieved when using biomass as fuel in a commercial sc...
ABSTRACT The characteristics of flow over side weirs are taken into consideration to verify the discharge coefficient for subcritical flow conditions under the assumption of constant specific energy. The main channel discharge, length of weir crest and sill height of the weir are treated as controlled variables. The discharge coefficient Cd is found to depend 011 the Upstream Froude No 171 and also on the ratio of sill height to upstream flow depth S/Yl . Simple linear regression analysis was...
ABSTRACT Optimal allocation of products to downstream locations is a major requirement for minimizing the distribution costs associated with supply chain systems. Unfortunately many supply chain managers rely on, their intuition and feelings to make these allocation decisions. In this study a mathematical model was developed for minimizing the distribution cost in a multi-product 2-echleon supply chain system. The distribution system of a leading bottling plant in Nigeria was studied to under...
ABSTRACT The initial stages of the design, fabrication and performance analysis of a prototype beans particle seperating machine discussed in this work. The working principle of the machine is based on the difference in aerodynamic properties as the basis for seperation of beans and associated foreign particles, mainly chaff and stones. To achieve the pneumatic principle ,the archetype design necessitated the incorporation of two blower fans at various tilt angles to the horizontal plane. The...
ABSTRACT Secure communication systems employing chaos have recently attracted significant interest. This is partly due to their high unpredictability and simplicity of implementation over conventional secure communications systems. This study presents the implementation of four chaotic modulation techniques employing Lorenz system as chaos generator. The techniques are Chaotic Masking (CM), Chaos Shift Keying (CSK), Chaos On-Off Keying (COOK), and Differential Chaos Shift Keying (DCSK). Simul...
ABSTRACT The frequent occurrence of fire accidents in commercial complexes has become a serious problem in Nigeria. The development of a quantitative tool for evaluating the proneness of a commercial complex to so called 'market fires' is the focus of this study. A rigorous review of the literature was carried to identify and characterize some existing risk analysis models applicable to the problem. Some past fire disasters were analyzed. Using the insight gained from the above, a mathematica...
ABSTRACT This paper applies the concept of Hybrid Structural Interaction Matrix (IISIM) to the management of quality in a manufacturing organisation. 111e application is motivated by the need 10 evolve alternative prioritisation tools in quality management. A process, which could be used to analyse a specific situation, was presented by showing how Structural Interaction Matrix (SIM) and Hierarchical Tree Structure Diagram (lITSD) could be used 10 create a model. The result indicates the feas...
ABSTRACT Energy study was conducted in an organic fertilizer plant in Ibadan, Nigeria, to determine the energy requirement for production of both powdered and pelletised organic fertilizer. The energy consumption patterns of the unit operations were evaluated for production of 9,000 kg of the finished products. The analysis revealed that eight and nine defined unit operations were required for the production of powder and pellets, respectively. The electrical and manual energy required for t...
ABSTRACT This paper reviewed and analysed vulnerability to climate change-induced rainfall variability and policy responses to agricultural water supply in Nigeria. The review provides evidence for policy feedbacks as well as priority setting for the post-2015 sustainable development agenda. Nigeria’s vulnerability to climate change variability is due to a number of factors: its geographical characteristics, limited capacity to adapt, dependence on climate-sensitive resources, teeming popul...