Papers by Ibifubara Humphrey
Effects of red and blue colour of monochromatic lights at intensities of 500 lux, 1000 lux, 1500 ... more Effects of red and blue colour of monochromatic lights at intensities of 500 lux, 1000 lux, 1500 lux and 2000 lux on the growth of <em>Oedogonium</em> sp. The cell growth was monitored by measuring the optical density (absorbance) at 680 nm using a Digital Spectrophotometer. GC-MS analysis was also carried out for extraction of <em>Oedogonium </em>sp<em>.</em> The results showed maximum values for absorbance 0.378 Au and 0.364 Au for blue and red light respectively at 2000 lux. While minimum values of 0.237 Au and 0.249 Au were obtained at intensity of 500 lux for blue light and red light respectively. The pigment concentration showed a consistent daily increase, with a maximum pigment concentration of chlorophyll a 4.31 mg/L and chlorophyll b 7.36 mg/L for blue light and chlorophyll a 4.15 mg/L and chlorophyll b 7.09 mg/L for red light at 2000 lux. Result for GC-MS analysis produced 12 volatile components; 10 hydrocarbons and 2 acids, which impli...
A good understanding of the diverse mechanisms in the atmosphere is required in modelling the cli... more A good understanding of the diverse mechanisms in the atmosphere is required in modelling the climate. In this study, the diurnal and seasonal patterns of all-sky downward longwave radiation (DLR) at Ilorin (8o 32l N, 4o 34l E), Nigeria were investigated alongside relative humidity (RH) and temperature. The average diurnal pattern of DLR gives an arc that begins by increasing gradually with some inherent fluctuations from 01:00 hour to a maximum at 14:00 hour local time, and then gradually decreases to a minimum at 00:00 hour. However, sometimes erratic and double peak arc diurnal DLR patterns occur around the mid and the end of the year periods respectively. The seasonal, diurnal peak of temperature and the minimum of relative humidity (RH) occur approximately two hours after the peak of DLR. Besides, the seasonal trends of both DLR and RH match each other, except sometimes in June, which could be due to the midyear DLR erratic diurnal effect. Possibly, the mechanisms of the inter-...
International Journal of Energy for a Clean Environment, 2020
Catalysis in Green Chemistry and Engineering
Beni-Suef University Journal of Basic and Applied Sciences, Dec 1, 2019
Background: Though downward longwave radiation (DLR) models curb the paucity of data, they are mo... more Background: Though downward longwave radiation (DLR) models curb the paucity of data, they are mostly location dependent. Therefore, there is a need to evaluate their relevance given the increasing use of machine learning techniques. In this study, cloudless DLR estimates from regression models and soft computing models of neural networks (NN), support vector regression (SVR) and adaptive neuro-fuzzy inference system (ANFIS) were compared.
In this work, the production of biodiesel from four sources of non-edible oils, namely jatropha, ... more In this work, the production of biodiesel from four sources of non-edible oils, namely jatropha, animal fat, waste vegetable oil and castor oil was carried out. It was done using an acid esterification process followed by alkali transesterification in the laboratory. Subsequently the physicochemical properties for four blends B100, B80, B50 and B20 were determined to establish their adherence to the ASTM standard for biodiesel. The percentage yields of the biodiesel from jatropha, animal fats, waste vegetable oil and castor oil were 98, 85, 95 and 90 % respectively. Highest density value was 0.8870g/cm 3 for jatropha (B100), while lowest density of 0.8502 g/cm 3 /cm 3 was obtained from animal fats (B20). The highest value of flash point was 179 o C for jatropha (B100), while the lowest flash point was 102 o C for animal fats (B20). Viscosity values ranged from 5.254mm 2 /s for animal fats (B100) to 2.891mm 2 /s for castor oil (B20), the lowest pour point was-9 o C for castor oil (B20), while the highest pour point was 15 o C for animal fats (B100). All the physicochemical properties examined in this study were within the ASTM standard range apart from the flash point for animal (B20) which was below the standard range.
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Papers by Ibifubara Humphrey