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Department  of Psychology
4
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Department of  Geography and Resource Development
13
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Publication History View all

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    ABSTRACT: Mathematical model of the transient heat distribution within Ghana Research Reactor-1 (GHARR-1) fuel element and related shutdown heat generation rates have been developed. The shutdown heats considered were residual fission and fission product decay heat. A finite difference scheme for the discretization by implicit method was used. Solution algorithms were developed and MATLAB program implemented to determine the temperature distributions within the fuel element after shutdown due to reactivity insertion accident. The simulations showed a steady state temperature of about 341.3 K which deviated from that reported in the GHARR-1 safety analysis report by 2% error margin. The average temperature obtained under transient condition was found to be approximately 444 K which was lower than the melting point of 913 K for the aluminium cladding. Thus, the GHARR-1 fuel element was stable and there would be no release of radioactivity in the coolant during accident conditions.
    Annals of Nuclear Energy 06/2014; 68:204–208.
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    ABSTRACT: To estimate the direct and indirect costs of meningitis to households in the Kassena-Nankana District of Ghana. A Cost of illness (COI) survey was conducted between 2010 and 2011. The COI was computed from a retrospective review of 80 meningitis cases answers to questions about direct medical costs, direct non-medical costs incurred and productivity losses due to recent meningitis incident. The average direct and indirect costs of treating meningitis in the district was GH¢152.55 (US$101.7) per household. This is equivalent to about two months minimum wage earned by Ghanaians in unskilled paid jobs in 2009. Households lost 29 days of work per meningitis case and thus those in minimum wage paid jobs lost a monthly minimum wage of GH¢76.85 (US$51.23) due to the illness. Patients who were insured spent an average of GH¢38.5 (US$25.67) in direct medical costs whiles the uninsured patients spent as much as GH¢177.9 (US$118.6) per case. Patients with sequelae incurred additional costs of GH¢22.63 (US$15.08) per case. The least poor were more exposed to meningitis than the poorest. Meningitis is a debilitating but preventable disease that affects people living in the Sahel and in poorer conditions. The cost of meningitis treatment may further lead to impoverishment for these households. Widespread mass vaccination will save households' an equivalent of GH¢175.18 (US$117) and impairment due to meningitis.
    PLoS ONE 11/2013; 8(11):e79880.
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    ABSTRACT: To overcome the loss of structural integrity when eyeball sections are prepared by wax embedding, we experimentally modified the routine histological procedure and report satisfactorily well-preserved antero-posterior sections of whole eyeballs for teaching/learning purposes. Presently histological sections of whole eyeballs are not readily available because substantial structural distortions attributable to variable consistency of tissue components (and their undesired differential shrinkage) result from routine processing. Notably, at the dehydration stage of processing, the soft, gel-like vitreous humor considerably shrinks relative to the tough fibrous sclera causing collapse of the ocular globe. Additionally, the combined effects of fixation, dehydration, and embedding at 60°C renders the eye lens too hard for microtome slicing at thicknesses suitable for light microscopy. We satisfactorily preserved intact antero-posterior sections of eyeballs via routine paraffin wax processing procedure entailing two main modifications; (i) careful needle aspiration of vitreous humor and replacement with molten wax prior to wax infiltration; (ii) softening of lens in trimmed wax block by placing a drop of concentrated liquid phenol on it for 3 h during microtomy. These variations of the routine histological method produced intact whole eyeball sections with retinal detachment as the only structural distortion. Intact sections of the eyeball obtained compares well with the laborious, expensive, and 8-week long celloidin method. Our method has wider potential usability than costly freeze drying method which requires special skills and equipment (cryotome) and does not produce whole eyeball sections. Microsc. Res. Tech., 2013. © 2013 Wiley Periodicals, Inc.
    Microscopy Research and Technique 11/2013;

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    Accra, Ghana
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