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Articles by O.O. Ajayi
Total Records ( 11 ) for O.O. Ajayi
  O.O. Ajayi and D.O. Olawale
  This research looks at the average weight control of the Nigeria bakery industry. Visits were made to some bread factories and their statistical quality control measures were investigated, these were found to be substandard and samples taken insignificant at 95% confidence interval. One hundred percent batch weights of the whole production lot from factory site of a leading player in the industry were taken and analyzed using average weight per batch measure. Better approach to data analysis using the statistical hypothesis testing method was suggested, instead of those in operation within the industry. This proves to be time saving, eliminate error due to insignificant sample sizing, thus, quick decision can easily be reached with 95% confidence level.
  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.
  A.O. Odukwe , O.O. Ajayi and G.O. Oluwadare
  This research used the stress intensity factor with rate of crack growth per cycle of loading to model and simulates the crack growth in Martensitic steel in air environment. The basic parameters used were da/dN and ΔK, log (da/dN) was analyzed against log (ΔK) and a regression analysis using data from log (da/dN) vs log (ΔK) was carried out and the outcome employed to develop a model and simulation which gave rise to interactive software that can be used to predict the behavior of a structural member under conditions of certain loading. Additionally, it can be employed to have quick access to data and design considerations, when input data are supplied. This became useful in monitoring the point at which crack can initiate and the rate at which it would grow in a particular structural member of interest. The software has been tested with theoretical and experimental data.
  D.N. Olowoyo , O.O. Ajayi , I.A. Amoo and A.F. Ayeisanmi
  The concentrations of Pb, Ni, Fe and Cd were determined using Atomic Absorption Spectrophotometer-Varian Spectral AA220 in catfish, blue crab and crayfish from Warri coastal water of Delta state. Of all the heavy metals examined, the line charts presented in Fig. 2, 3 and 4 indicate that Cd and Pb have the highest concentration while Fe and Ni have the least concentration in the three fauna considered for the experiment at both dry and wet seasons of 2008. The mean concentration values for catfish are: 0.002-2.52 mg/kg, 0.22-3.50 mg/kg, 0.002-1.48 mg/kg and 0.009-18.13 mg/kg; blue crab: 0.82-3.40 mg/kg, 0.35-2.50 mg/kg, 0.06-1.61 mg/kg and 1.62-12.88 mg/kg and crayfish: 0.22-8.00 mg/kg, 0.01-2.25 mg/kg, 0.004-0.55 mg/kg and 0.038-18.13 mg/kg for heavy metals of Pb, Ni, Fe and Cd respectively. The concentrations of the metals determined varied from one location to another and from one specie to another. Hence, Egbokodo location has the highest Cd content in catfish while Jeddo and Ughoton locations have highest Cd content in crayfish and blue crab respectively. Lastly, the order of increasing in concentration of the metals is Fe<Ni<Pb<Cd.
  K. Adesina , A.A. Oshodi , T.A.M. Awoniyi and O.O. Ajayi
  Studies on the microbiological quality of milk obtained from traditionally managed cows in Ado-Ekiti were carried out. The samples were screened for total bacteria count, total Coliform, yeasts and moulds. Ten (10) bacterial species, comprising both gram negative and gram positive organisms were isolated, characterized and identified in thirteen out of fifteen milk samples in this study. Bacillus cereus recorded the highest percentage occurrence (46.7%) isolated from seven samples while Cellulomenas flavigena, Escherichia coli and Micrococcus luteus recorded the lowest percentage occurrence (6.7%) having being isolated from one sample each. Yeasts and moulds were not isolated in any sample. The isolation of the various microorganisms in the milk samples is of health significance. The results showed that 87% of the raw milk samples were of poor category thus indicating a deplorable state of hygiene and poor production condition during and after milking.
  O.O. Ajayi
  This research used the Linear elastic fracture mechanics relation together with that of the stress intensity factor range after substituting the material constants A, M developed from the outcome of an experiment conducted on a high yield strength (σy = 100 Ksi (689 MN/m2), critical stress intensity factor (Kc) = 150 Ksi [in]1/2 (165 MN/mm2)) Martensitic steel in air environment to develop a working model which was then employed with different constant amplitude stresses and varying average crack lengths to generate data. Series of regression analysis and optimization processes were employed to create a novel model which is suitable for data analysis, generation of design consideration, evaluation and determination of damage tolerance and safe operating condition. This has been used to eliminate the many mathematical steps and processes involved in data analysis and add ease to design and evaluation.
  O.O. Ajayi and O.A. Koya
  This study has been used to eliminate the rigorous activities and time consuming mathematical analysis involved in plumbing design. The various mathematical steps employed in the design of plumbing systems has been converted into easily interpreted hand user computer program that can be used to generate automatically all the various parameters needed for full design work, when the input data such as head available, various number of fittings, actual lengths of pipe run and assumed pipe diameter are provided. This has been used to provide a pathway to easy plumbing design.
  O.O. Ajayi and J. Ikotun
  The linear elastic fracture mechanics equation together with that for stress intensity factor range ΔK, was used to develop a fatigue propagation life model, after substituting parameters of material constants. The model was then employed in creating simulation software which can be used at any time to generate data, make design consideration and predict response to variable loading. This became useful in predicting the life of metal from the point of crack initiation; investigate behaviour to changes in crack sizes and also determine adequate damage tolerance for the metal.
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