Browsing by Author "Owolabi TA"

Now showing 1 - 3 of 3
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    Combining multicriteria decision analysis with GIS for suitably siting landfills in a Nigerian state
    (2019) Ajibade FO; Olajire OO; Ajibade TF; Nwogwu NA; Lasisi KH; Alo AB; Owolabi TA; Adewumi JR
    Population explosion coupled with poor governance and land use planning is responsible for indiscriminate dumping of solid waste in unsuitable sites. Despite the vast availability of modern methods of siting landfills, many waste disposal methods in Akure are piled up in open sites and unsafe. Owing to this lack of effectiveness of these common methods in Akure, a better approach is adopted to enable the analysis of a number of required qualitative and quantitative issues for landfill site selection. This study is aimed at identifying suitable sites for solid waste disposal and management while considering all essential factors and rating criteria by integrating GIS with multi-criteria decision analysis (MCDA) in Akure, Ondo State. Standards for siting landfill formulated by the Environment Protection Agency (EPA) were employed in this study. The criteria that are considered herein are land use, slope, distance to drainage, distance to linear features, soil, geology, distance to the residence and road accessibility. These criteria were assigned fuzzy membership classes based on their importance in siting landfill. The fuzzy members of all criteria were overlaid to generate the final landfill site suitability map which was classified into five: not suitable (34.1%), less suitable (50.4%), moderately suitable (0.3%), suitable (0.02%) and highly suitable (15.5%). The Analytical Hierarchy Process (AHP) technique was employed in the selection of the landfill site with reverence to multiple criteria and the fuzzy membership classes in accordance with the standards of the EPA. The result of this study serves as guide for further field survey.
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    Modelling and optimal control analysis of Lassa fever disease
    (2020) Peter OJ; Abioye AI; Oguntolu FA; Owolabi TA; Ajisope MO; Zakari AG; Shaba TG
    Lassa fever is a severe hemorrhagic viral infection whose agents belong to Mastomys natelensis. Generally, humans contract Lassa virus through exposure to food or household products that have been contaminated with the excreta of the infected rodents. Lassa fever is endemic in some West African countries including Nigeria. A basic model is proposed to examine the transmission of the disease. The proposed model is subjected to qualitative study via the theory of differential equations and the threshold quantity that denotes the dominant eigenvalue was derived using next-generation matrix approach. The basic model is further extended to an optimal control model with four controls namely, the fumigation of the environment with pesticide, the use of condom to prevent human to human transmission during sexual activities, early treatment and the use of indoor residual spray. The theory of optimal control was explored to establish the necessary conditions for curtailing the transmission of Lassa fever. Numerical simulation was conducted and the results showed that if the Lassa fever transmission and spread were to be reduced significantly in the endemic region, all the control measures must be taken with all seriousness.
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    Scanning electron microscopy and Fourier transmission analysis of polyhydroxyalkanoates isolated from bacteria species from abattoir in Ota, Nigeria
    (2019) Nwinyi OC; Owolabi TA
    This study reports production of polyhydroxyalkanoates (PHA) from microbial species obtained from abattoir by altering different carbon source (acetate and molasses) in minimal salt medium. The isolates were characterized by understanding their physiological responses to biochemical tests, optical microscopy examination and comparison to standard reference organisms. They were presumably species of Lactobacillus, Bacillus, Corynebacterium, Arthrobacter and Rhodococcus. The PHA products from these isolates were confirmed to be of plastic origin using the Fourier transmission analysis and the microstructure analysis elucidated by the scanning electron microscopy coupled with electron dispersive spectra. The sourcing of this resource (PHA) from bacteria species domiciled in the high organic environment could provide amazing metabolic machinery that could create a cost effective means for PHA production.