Browsing by Author "Jimoh, A."
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Item Characterization and Treatment of Spent Deposited Sludge of Transformer Oil (DSTO) by acid leaching and solvent extraction(Institute of Mining and Metallurgy, Australia in collaboration with Taylor and Francis, United Kingdom, 2017-09-18) Baba, A, A.; Ayodele, J. S.; Ameen, O. M.; Jimoh, A.; Johnson, U.; Jimoh, B. A.; Lawal, A.The characterisation of spent transformer oil to determine its fitness for re-refining as well as the recovery of metals by hydrometallurgical treatment in chloride medium has been investigated. The leaching experiments on the spent material showed that its dissolution increases with leachant concentration performed at 75°C. Leaching studies showed that at optimal conditions, the dissolution reached 93% by 1.0 mol L−1 HCl solution within 120 min at 75°C. The solvent extraction of copper by bis(2,2,4-trimethylpentyl) phosphinic acid (CYANEX®272) in kerosene from a pregnant solution of aqueous spent deposited sludge of transformer oil containing 1243.4 mg L−1 Cu++, 389.2 mg L−1 Fe++/+++, 110.7 mg L−1 Ca++ and 235 mg L−1 Al+++ was studied. The results for the solvent extraction give an extraction efficiency of 91.77% total copper acquired via 0.2 mol L−1 CYANEX®272 in kerosene at 27±2°C within 25 min at pH 4.0. A 0.1 mol L−1 HCl solution was found to be sufficient for the stripping of about 94.77% copper from the loaded organic phase. The Fourier transform–infrared spectroscopic analysis of the loaded organic phase supports the stripping experiment as there was no Cu metal ion present in the separated organic phase.Item ECONOMIC ANALYSIS OF ARTIFICIAL INSEMINATION IN BROILER PRODUCTION IN OYO STATE, NIGERIA(Journal of Agribusiness and Rural Development, Wydawnictwo Uniwersytetu Przyrodniczego w Poznaniu, 2020) Akinsola, G.O.; Adewumi, M.O.; Falola, A.; Ojediran, E; Jimoh, A.Artificial insemination (AI) in poultry production is a veritable technique in solving the problem of breeding and meeting the increasing demand. This study assesses the economics of artificial insemination in broiler production among sixty randomly selected broiler farmers in Oyo State, Nigeria. Primary data were used for this study. They were collected using a well-structured questionnaire. The analytical techniques applied include descriptive statistics, gross margin analysis and stochastic frontier analysis (SFA). The results have shown that most of the farmers are male and are at their prime age. The majority of the livestock farmers have some form of formal education and a minimum of five-year experience in poultry farming. The capital was mostly sourced from the bank. The majority of the farmers have a stock size of more than 25,000 birds. They have a gross margin of N341, 933,406. Only 20% of gross income was used for operating expenses with a return on invested capital of 4.3. The mean technical efficiency was 80.70%. Feed, vaccines and stock size were statistically significant in determining efficiency while education and extension visits are the statistically significant variable influencing technical inefficiency. It is therefore recommended that affordable and accessible input, as well as training, be made available to farmers to achieve self-sufficiency and sustainability.Item Heat and mass transfer effects on free convective couette dissipating fluid flow through a porous medium with slip conditions(Development Journal of Science and Technology Research, Faculty of Applied Sciences and Technology, Ibrahim Badamasi Babangida University, Laipai., 2016) Dada, M.S.; Agunbiade, S.A.; Jimoh, A.In this work, the effect of heat and mass transfer on unsteady free convective couette dissipating fluid flow with slip condition in presence of variables suction and radiative heat source are investigated. The governing equation of the model namely; continuity, momentum, energy and concentration equation are non-dimensionlised and solved using perturbation techniques. The numerical results are presented graphically and effects of material parameters have been discussed.Item Numerical study of unsteady free convective heat transfer in Walters-B viscoelastic flow over an inclined stretching sheet with heat source and magnetic field(The Pacific Journal of Science and Technology, 2015) Jimoh, A.; Dada, M.S.; Idowu, A.S.An investigation was carried out on the numerical study of unsteady free convective heat transfer in Walters-B viscoelastic flow over an inclined stretching sheet with heat source and magnetic field. The dimensionless governing equations are solved using an implicit finite difference method of Crank-Nicolson type. The effects of various parameters on the velocity and temperature fields as well as the coefficient of skin-friction and Nusselt number were presented graphically and in tabulated forms. It is observed that, when the heat source parameter increases, the velocity and temperature increase in the boundary layer.