ir.bowen.edu.ng:8181/jspui/handle/123456789/385 These are articles published in journals by academics staff Fri, 03 Apr 2026 10:35:38 GMT 2026-04-03T10:35:38Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1578 Title: Chemical characterization of harmattan dust across Oyo and Minna, Nigeria Authors: Falaiye, O. A.; Aweda, F. O. Abstract: Harmattan dust haze in Nigeria is due to annual deposition of very fine dust particles as a result of both natural and human activities. There are scanty reports on the mineralogical, elemental and heavy metal composition in the Harmattan dust blowing across the country to support the presence of minerals and elements in the Harmattan dust.The aim of this study is to assess minerals and elemental compositions of Harmattan dust variations across Oyo (7032'N, 3025'E) and Minna (9035'N, 6032'E), Nigeria. dust samples were collected using clean plastic bowls of 10 cm diameter and analysis was conducted on the samples collected at the two stations using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Fluoresence (XRF), Particle Induced X-ray Emission (PIXE)and Atomic Absorption Spectroscopy (AAS). It was observed that elements, such as K, Ca,Ti, Mn, Fe, Ni, Cu, Zn, Mo, As, Zr, Pb, V, Sr, Cr and Ce, were present in different concentrations in the samples collected. Minerals, such as Quartz [SiO2], Rutile [TiO2],Periclase [MgO], Corundum [Al2O3], Hematite [Fe2O3],Cuprite [Cu2O], [ZrO2], Litharge [PbO], Monazite [P2O5], Zincite [ZnO], Montroydite [HgO] and Lime [CaO], were present in the samples collected at each station in different proportions. The soil mass concentration of the elements was calculated and observed to be 3.5179μg m3 at Oyo and 3.4745μg m3 at Minna. It was observed that the Harmattan dusts moving across Nigeria have almost all the elements present in Harmattan dust varying from station to station as the dust is moving towards the south of the country. The study concluded that the elemental composition of the dust samples analyzed revealed that the percentage compositions of some elements are higher than the acceptable WHO standard values,which may affect human health. It is therefore recommended that adequate precautionary measures and policies should be made to help mitigate the effects of high elemental concentrations observed. Wed, 01 Jan 2020 00:00:00 GMT ir.bowen.edu.ng:8181/jspui/handle/123456789/1578 2020-01-01T00:00:00Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1221 Title: Estimation of global solar radiation, sunshine hour distribution and clearness index in Enugu, Nigeria Authors: Adeniji, N. O.; Akinpelu, J. A.; Adeola, S. O.; Adeniji, J. O. Abstract: The concept of solar energy and its applications in this present day world would come to be one of the solutions to our present Nigerian problem of instability and epileptic power supply. In the study, the baseline data for mean monthly sunshine hours (S ) and global solar radiation (H) for Enugu (6.70N, 7.60E) were obtained from the Nigeria Metrological Agency (NIMET), Oshodi Lagos Nigeria and spanned 1996 to 2010. The data for global solar radiation were measured with a Gunn-Bellani radiometer. The average sunshine hour for the period of study was estimated to be 5.67 hours; the Angstrom constants a and b of Angstrom-type correlation used in estimating monthly average global solar radiation was estimated to be 0.27 and 0.58 respectively; a linear regression correlation model was developed for Enugu. The result of global solar radiation was found to be 14.44 −2 −1 MJm day thereafter subjected to statistical tests [MBE , RMSE , MPE ] and proved to be good estimates with previous literatures reviewed. The value of clearness index ( ) KT was estimated to range from 0.43 to 0.61 showing Enugu as so a partly clear sky city. Tue, 01 Jan 2019 00:00:00 GMT ir.bowen.edu.ng:8181/jspui/handle/123456789/1221 2019-01-01T00:00:00Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1163 Title: Comparison of a low and a middle latitude GPS-TEC in Africa during different solar activity levels Authors: Bolaji, O. S.; Kotoye, A.; Ikubani, S. O.; Fashae, J. B.; Joshua, B. W. Abstract: In this work, we compared TEC values at Libreville (a low latitude station) with Sutherland (a middle latitude station) over Africa using Global Positioning System (GPS) receivers during high solar activity (HSA), moderate solar activity (MSA) and low solar activity (LSA). Apart from our confirmation that high, moderate and low values of TEC responded well to HSA, MSA and LSA, respectively at the low and middle latitude, equatorial ionization anomaly (EIA) played significant roles as regard higher values of TEC at Libreville compared to Sutherland. Interestingly, the TEC difference between a low and middle latitude revealed how EIA is majorly responsible for the occurrence of pre-reversal enhancement (PRE) in equinoctial months at Libreville. In addition, TEC difference majorly due to EIA is inactive around pre-sunrise and sunrise hours on some days during HSA and MSA. However, it is always active on all hours in all of the days during LSA. The obliterated semi-annual signature seen during HSA of seasonal difference in TEC magnitude is significantly associated with inactive EIA around 0400 LT – 0900 LT during March equinox, September equinox and December solstice. Mon, 01 Jan 2018 00:00:00 GMT ir.bowen.edu.ng:8181/jspui/handle/123456789/1163 2018-01-01T00:00:00Z ir.bowen.edu.ng:8181/jspui/handle/123456789/1055 Title: Ab initio investigation of the electronic, lattice dynamic and thermodynamic properties of ScCd intermetallic alloy Authors: Adetunji, B. I.; Olayinka, A. S.; Fashae, J. B.; Ozebo, V. C. Abstract: The electronic structures, lattice dynamics and thermodynamic properties of rare-earth intermetallic ScCd alloy are studied by the first-principles plane-wave pseudopotential method within the generalized gradient approximation in the framework of density functional pertubation theory. The band structure, density of states, phonon dispersion frequencies, vibrational free energy Fvib, specific heat capacity CV and entropy are studied between 0 K and 1500 K. Finally, using the calculated phonon density of states, the thermodynamic properties are determined within the quasi-harmonic approximation and a value of 47.9 (J/mol · K) at 300 K for specific heat capacity of ScCd is predicted. Fri, 01 Jan 2016 00:00:00 GMT ir.bowen.edu.ng:8181/jspui/handle/123456789/1055 2016-01-01T00:00:00Z