ORCID Profile
0000-0001-9124-1093
Current Organisation
Covenant University
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Publisher: Elsevier BV
Date: 10-2013
Publisher: Wiley
Date: 11-2013
Publisher: Oxford University Press (OUP)
Date: 10-06-2013
DOI: 10.1093/RPD/NCT140
Abstract: The purpose of this project is to evaluate the suitability of different sites as locations for obtaining underground water for consumption. The analysis of ²³⁸U, ²³²Th and ⁴⁰K from rock s les from each layer of borehole at a depth of ∼50 m at Site A borehole, S3L1-S3L6 in Gosa and 40 m at Site B borehole, S4L1-S4L5 in Lugbe, Abuja, north central Nigeria is presented. The gamma-ray spectrometry was carried out using a high-purity germanium detector coupled to a computer-based high-resolution multichannel analyzer. The activity concentrations at Site A borehole for ²³⁸U have a mean value of 26 ± 3, ranging from 23 ± 2 to 30 ± 3 Bq kg⁻¹, ²³²Th a mean value of 63 ± 5, ranging from 48 ± 4 to 76 ± 6 Bq kg⁻¹ and ⁴⁰K a mean value of 573 ± 72, ranging from 437 ± 56 to 821 ± 60 Bq kg⁻¹. The activity concentrations at Site B borehole for ²³⁸U have a mean value of 20 ± 2, ranging from 16 ± 2 to 23 ± 2 Bq kg⁻¹, ²³²Th a mean value of 46 ± 4, ranging from 43 ± 4 to 49 ± 4 Bq kg⁻¹, ⁴⁰K a mean value of 915 ± 116 and ranging from 817 ± 103 Bq kg⁻¹ to 1011 ± 128 Bq kg⁻¹. It is noted that the higher activity concentrations of ²³²Th and ²³⁸U are found in Site A at Gosa. Site B has lower radioactivity, and it is recommended that both sites are suitable for underground water consumption.
Publisher: IOP Publishing
Date: 08-2019
DOI: 10.1088/1742-6596/1299/1/012020
Abstract: This article surveys the various mechanisms of suppressing the killing heat in the electrical performance when a high solar irradiance strikes the surface of the solar panel. In addressing this killing heat, suitable technologies of cooling (active and passive) must be adopted to checkmate the abrupt temperature increase in the solar panel. The theoretical and experimental results of previous studies were critically reviewed. The study suggests that the efficiency of solar panel can be improved beyond 45 % provided a suitable cooling technology can be adopted during the design and installation.
Publisher: IOP Publishing
Date: 12-2019
DOI: 10.1088/1742-6596/1378/2/022001
Abstract: Thermionic energy converter (TEC) has recently received significant attention, for it holds potential for clean energy generation with a very high theoretical conversion efficiency (60%). For the latter to be achieved, some of the key hurdles are to be overcome. This paper discusses all these key hurdles along with modelling of solar energy conversion using a TEC with nano-materials and metals, using the modified Richardson-Dushman equation, which best describes the thermionic emission current density from these materials. Using two scenarios: allowing natural heat radiation from the back surface of the collector and using controlled heat collection from the collector to maintain it at a fixed temperature. We then discuss results of simulation of the conversion efficiency as a function of temperatures of emitter and collector, work functions and Fermi energy of emitter and collector at absolute zero temperature, solar insolation, the radius of parabolic concentrator and emissivity of radiating surfaces. We discuss the impact of neglecting the radiation losses on the efficiency evaluation as has been done by other workers recently. We suggest some innovative ways to reduce significantly the space charge effect to make a solar TEC a reality.
Location: Nigeria
No related grants have been discovered for Omeje Maxwell.