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Articles by O.A. Olu-Arotiowa
Total Records ( 5 ) for O.A. Olu-Arotiowa
  O.A. Olu-Arotiowa , M.O. Aremu and A.O. Alade
  Ex-situ Bioremediation of diesel-polluted wastewater had been investigated in this study. Three microbes namely Baccillus subtilis, Pseudomonia aerigunosa, both bacteria and Penicillilum funiculosum, a fungus, isolated from the wastewater collected from a refinery sewage tank were used. The cultured micro-organisms were used to degrade 1.5 mL of diesel oil in 7 mL minimal salt medium for 20 days and samples were taken and analysed every 5 days. Bioremediation was achieved by all the organisms but at different rates. The results showed that out of the three organisms tested, the fungus Penicilium funiculosum has the best degrading ability with 0.2 and 0.46 mL residual oil at 15 days and 20 days, respectively, while Bacillus subtilis and Pseudomonas aeruginosa (both bacteria) has the same degrading ability of 0.7 mL residual oil after 20 days.
  O.A. Olu-Arotiowa , L.A. Jimoda , D.O. Araromi and R.O. Yusuf
  Production of polyurethane foam has been made more cost effective by introducing soya-oil as a surfactant. Consequently, profit maximization has brought about the need to introduce less expensive stabilizing agent. This led to the use of soya-oil in substituting for the commonly used silicone oil. This was carried out in varying concentrations of silicon and soya-oil. It was however proven that soya-oil cannot act as surfactant in polyurethane foam but a combination of 75 silicon oil and 25% vegetable oil gives polyurethane foam with desired physical and mechanical properties. The costing of the price per block of foam produced shows that foam production using vegetable oil as surfactant is cost effective and characterized by foams of better quality.
  D.O. Araromi , O.A. Olu-Arotiowa , J.O. Olajide and T.J. Afolabi
  Corn flour was studied to determine the physical properties such as equilibrium moisture Content, Equilibrium Relative Humidity (ERH), initial moisture content and critical moisture content. These were experimentally determined using the static gravimetric method at 4 temperatures, ranging from 20-50°C and at various ERH values ranging from 0.113-0.9812. Two mathematical models- Neuro-fuzzy and Gab were used to fit experimental isotherm data. The 2 models were used to predict shelf life of the corn flour. Comparisons were made to determine the validity and suitability of the 2 models. Within the range of temperatures investigated, GAB and Neuro-fuzzy models better describes the experimental data for corn flour for adsorption isotherm. Neuro-fuzzy model not only accommodated temperature and water activity parameter but is also better than GAB model in the prediction of corn flour shelf-life.
  O.A. Olu-Arotiowa , R.O. Yusuf and F. Adelowo-Imoekparia
  Theoretical models for biodegradation of crude oil spill have been developed. The model was formulated on specific rate of biodegradation of the crude oil for both single and multiple microbial catalyzed reactions. The formulated model was tested for biodegradation of the diesel oil with experimental data obtained. The result of the simulation showed that the models are suitable for predicting the rates of biodegradation of hydrocarbon mixtures.
  O.A. Olu-Arotiowa , F. Adelowo-Imoekparia and O.K. Afolabi
  The use of Epoxidised Orange Seed Oil (EOSO) as substitute for polyol in foam synthesis has been investigated. The presence of the tri-functional group, triol in orange seed oil presented a 3 dimensional structure which brought rigidity to the product. The result showed that the use of EOSO is not suitable for flexible foam production, but the use of 100% EOSO produced semi-rigid foam which can be used in other various applications. Also, it was discovered that formulation 2 which contained 25% of epoxidised orange seed oil was very close to the control formulation in terms of density (20.59-24.70 Kg m 3) and tensile stress (66.7 KN m 2) compared to that for standard poly-urethane foam at (83.33 KN m 12). However, its elongation at break point recorded as 144.44% is less than the standard value of 216.70%.
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