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Articles by O.A. Omotosho
Total Records ( 6 ) for O.A. Omotosho
  O.A. Omotosho , O.O. Ajayi , O. Fayomi and V.O. Ifepe
  Mild steel coupons of dimension 4 by 1.5 cm were examined for the purpose of understanding its deterioration behavior in 2 M sulphuric acid solution in the presence of Butyrospermum parkii at a temperature of 60°C. The gasometric technique was used and a number of mild steel coupons were systematically submitted to uninhibited test solutions and those containing extract quantities of 60, 100, 140 cm3. The volume of hydrogen gas evolved data was recorded for 60 min and thereafter analyzed. The results revealed that though extract quantity was increasing, H2 evolution and corrosion rate decreased, while only %I.E increased. The reduction in corrosion rate was observed to follow in order of increasing extract quantity. The phytochemical-metal interaction mechanism was best explained by Freundlich isotherm. The best contact time for the extract phytochemicals to properly adsorb to metal surface at extract quantity of 60 cm3 was 4 min. Furthermore, an expression that explained the correlation between corrosion rate and BP extract quantity was also obtained. The microstructural studies showed that increasing the extract quantity resulted in scanty dispersion of the third phase without any reduction in the pearlite and ferrite phases especially in the 140 cm3 extract which corresponds to a reduction in degradation rate.
  J.O. Okeniyi , O.A. Omotosho , O.O. Ajayi , O.O. James and C.A. Loto
  The performances of sodium nitrite and aniline inhibitors on the corrosion of concrete steel rebar partially immersed in sodium chloride and sulphuric acid media were investigated in this study. The open circuit potential corrosion monitoring technique was employed for the marine and acidic simulating environments and potential readings were taken in accordance with ASTM C 876. Inhibiting quality and uniformity of the inhibitors were then analyzed using the Weibull probability density distribution as an extreme value statistical modelling approach to study performance effectiveness and predict the most efficient inhibitor in each media. In the statistically analyzed experimental results for each of the inhibitor concentrations employed, (0.679 M) sodium nitrite is identified as exhibiting the best inhibiting quality in sodium chloride while (0.137 M) aniline was predicted as showing the lowest probability of corrosion risk in sulphuric acid medium. The synergetic admixtures employed in the study performed poorly in inhibiting effectiveness compared to the control specimens in the two media considered. The overall probabilistic results predicted preferences of sodium nitrite as inhibitors in the sodium chloride medium simulating saline environments and aniline in sulphuric acidic medium simulating sewage or underground microbial environments.
  S.A. Aasa , O.O. Ajayi and O.A. Omotosho
  In this research, an improved method for the design and adaptation of a hot air dryer for yam chunk was conducted. The system consists of the heating element, blower, drying chamber and heating chamber. The heating chamber was directly connected to the drying chamber of 1200 mm by 600 mm which comprise of drying elements and three perforated trays for laying the chunks. The frame for the system was made from angle iron with its body fully lagged to reduce heat loss to the surroundings. Also, tests for load and no-load situations were performed to optimize the condition of its maximum performance. It was observed that the system performed satisfactorily by giving optimum efficiency of 53%. Also, nearness of the trays to the vent did not play any major role in the drying rate of the yam chunks. Hence, it is concluded that drying of yam flower chunk was effectively achieved with a hot air dryer under a time of 6 hours compared to 5-7 days in sun drying and 2 days in most drying methods. This drying duration promoted the nutrient levels and hygiene of the yam chunk by eliminating mucus growth.
  O.O. Ajayi , O.A. Omotosho , K.O. Ajanaku and B.O. Olawore
  Hydrochloric acid induced damage of aluminum alloy in the presence of Cola acuminata extract was investigated using gasometric technique. Aluminum alloy coupons of dimension 4 cm by 1 cm were immersed in test solutions of free acid and also those containing extract concentrations of 2-5 cm3 at ambient temperature for 30 min. The volumes of hydrogen gas evolved as a result of the reaction rate were recorded and analyzed. The outcome revealed that maximum inhibitor efficiency which corresponds to the lowest corrosion rate was obtained at optimum inhibitor concentration with reduction in the corrosion rate observed to follow in order of increasing extract concentration. The mechanism of interaction between the phytochemicals in the plant extract and aluminum alloy surface was best described by the Frumkin isotherm with 6 and 14 min becoming the best exposure time for the phytochemicals in extract concentrations of 3-5 cm3 to suitably adsorb to metal alloy surface. Statistically modeling the corrosion rate yielded a significant relationship suitable for estimating corrosion rate values once concentration of the extract is known. In addition, the superficial analysis revealed that crack growth rate slowed down and irregular intermetallic phases were more uniform as extract concentration increased.
  Oluseyi O. Ajayi , R.O. Fagbenle , J. Katende , O.A. Omotosho and Samson Aasa
  The study was used to develop a model that can be employed to carry out a pre-assessment study of a potential site for wind farm establishment. It made use of 21 years (1987-2007) monthly mean wind speeds from 11 stations spread across the South-West geopolitical zone of Nigeria. The data were assessed from the nation’s meteorological department, Oshodi Lagos. These were then statistically analyzed to develop a model that could predict the likelihood of a site’s capacity for wind farm development. The model could also serve as a pointer to predicting the likely range of wind energy magnitude that can be generated from a site. Further to this, the results obtained from employing the model were compared with those obtained from the well established 2-parameter Weibull statistics and found to be good enough. Thus the model, if employed can serve as a first stop for wind energy investor to make decision on a potential site before comprehensive site assessment study is embarked upon.
  O.M. Ogundele , J. Madukwe , O.A. Omotosho , O. Adeeyo , C.O. Akintayo and E.A. Caxton-Martins
  Immunohistochemical localization of CD3 and Neuron Specific Enolase (NSE) to demonstrate neuronal metabolism in proliferation and cell recovery was carried out in this study to evaluate morphological and cellular changes in cyanide treated perfused cortical tissues of adult wistar rats in vitro. Four separately perfused tissues were stained with antibodies specific for neuron specific enolase using antigen retrieval method and colour reaction involving 3’3’-Di aminobenzidine tetrachloride (DAB) in peroxidase anti peroxidase method. Treated cells showed increased in enolase activity implying increase proliferation activity for repair purposes in the assaulted neuron (cyanide treated neurons). Presence of CD3 activity also indicates the presence of undifferentiated T-lymphocytes around the cells undergoing apoptosis in the cortex following treatment with cyanide.
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