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Articles by A.A. Adedeji
Total Records ( 4 ) for A.A. Adedeji
  K.O. Oyedeji , A.F. Bolarinwa and A.A. Adedeji
  Cola nitida (Kola nut) is a caffeine-containing nut native to tropical North African and cultivated extensively in the new world tropics. Several studies have reported its effects on body weight and reduction in body fat without undesirable side effect as well as on gastric secretion but there is a dearth of information on its effect on reproduction. This study was designed to investigate the effect of its aqueous extract on reproductive parameters in male albino rats. Aqueous Extract of Cola nitida designated as AECON was prepared using cold maceration. The extract was administered for 30 days for andrological study. Distilled water (0.5 mL) served as the control. Plasma testosterone levels were assayed using ELISA and semen analysis was done microscopically, histology of the testis was done. Data was analysed using ANOVA at p<0.05. Treatment of rats with all doses of AECON caused significant decrease in testosterone levels, sperm motility, sperm viability and sperm count relative to the control but there was no significant change in sperm morphology. The testicular histopathological study revealed that there was moderate to severe necrosis with the dissolution of numerous seminiferous tubules in testis.
  A.A. Adedeji and S.P. Ige
  Finite Element Method (FEM) analysis was implemented to investigate and compare the performance of a reinforced concrete bare frame, infilled with and without straw bale wall and Shape Memory Alloy (SMA) diagonal wires, subjected to seismic loads and earthquake ground excitations. Equivalent lateral force (static), response spectrum and time history method of seismic analysis were embarked upon to determine the frame capacities, investigate their failure mechanisms and compare their residual and inter storey drift with one another. Also their respective maximum storey displacements have been graphically presented alongside with moments and shear forces. It has been observed from this analysis that under the lateral force, bare frame and straw bale wall infill experienced Maximum Top Storey Displacements (MTSD) of 55.63 and 55.61 mm, respectively. The maximum storey displacement was reduced to 11.19 mm with the application SMA as a concentrically brace members which give 79.8% reduction in the maximum storey displacement. Under UBC97 spectrum, the maximum top storey displacement reduced by 47.3, 52.4 and 73.5% for straw bale wall, SMA brace frame and SMA-straw bale frames respectively. Under Elcentro earthquake ground excitation, the maximum top storey displacement reduced by 0.02, 7.5 and 78.9% for straw bale wall, SMA brace frame and SMA-straw bale frames, respectively. From the results of the analysis, the displacement of the frame is drastically reduced by a concentric application of SMA wires in the frame. The computed force-deformation response used to assess the overall structural damage and its distribution was found to have a sufficient degree of accuracy.
  Abdul A. Koroma , Victor S. Kamara and A.A. Adedeji
  Treatment of the unbound open-graded has been done with the use of both asphalt and cement but the asphalt treated permeable basecourses is the most prominent. An experimental program was, therefore, conducted to determine the hydraulic and durability properties of asphalt treated permeable bases using three different aggregate types, 2 gradation types and three targeted percent air voids content of 15, 25 and 35. It was observed that the asphalt treated with permeable base course (ATPB) have appreciable coefficient of hydraulic conductivity but it looser strength and durability as the percent air voids content increases, making it unstable.
  D.P. Katale , V.S. Kamara and A.A. Adedeji
  This study was conducted to investigate the significance of clayey soil bricks mixed with cow dung to construct sustainable and environmentally friendly buildings. The clayey soil was collected at about 5 km South of Okahandja and the cow dung was obtained from Rietfontein in the Omaheke region of Namibia. Analysis of all the test samples suggested that the California Bearing Ration (CBR) decreases as the amount of cow dung is increased across the entire sample. The cow dung was added as a reinforcing agent in different proportions. The compression test outcome suggests that the strengths of the bricks decrease with increasing cow dung content.
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