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Search Results: 1 - 10 of 728894 matches for " S. T. A. Okolie "
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Experimental Evaluation of Temperature Effects on Detarium microcarpum, Brachystegia eurycoma and Pleurotus Biomaterial Mud  [PDF]
K. C. Igwilo, G. O. Osueke, S. T. A. Okolie, P. A. L. Anawe, Okoli Nnanna
Open Journal of Yangtze Oil and Gas (OJOGas) , 2017, DOI: 10.4236/ojogas.2017.22007
Abstract: Three sets of drilling fluids were formulated from biomaterials such as Detarium microcarpum, Brachystegia eurycoma and Pleurotus. The laboratory measurements were carried out on plastic viscosity, yield point and fluid loss exposed at required temperatures and then evaluated. The field Polyanionic cellulose additive that is currently in use was also formulated and used as a control sample to biomaterial products. Xanthan gumpolymer on equal concentration was added to both muds. The three sets of muds comprises the one without weighting material and the ones weighted up with calcium carbonate and barite respectively for both biomaterial mud and Polyanionic mud were examined as per American Petroleum Institute Standard. The graphs of the rheological properties and fluid loss against temperature were plotted. It was shown from the plots that the yield point and plastic viscosity decreased with increase in temperature while fluid loss increased with increase in temperature for both biomaterial mud and Polyanionic mud. It was also shown from the tables that the plastic viscosity and yield point are slightly better than the Polyanionic mud but less active in fluid loss than the Polyanionic mud.
Evaluation of the Fluid Loss Property of Annona muricata and Carica papaya  [PDF]
K. C. Igwilo, P. A. L. Anawe, S. T. A. Okolie, Ikeagwu Uzorchukwu, Onuh Charles
Open Journal of Yangtze Oil and Gas (OJOGas) , 2017, DOI: 10.4236/ojogas.2017.23010
Abstract: This technical paper evaluates the fluid loss property of Annona muricata and Carica papaya, prepared and measured as per API standard. This is a laboratory measurements carried out using low temperature and low pressure filter press. The prepared fluids were supplemented with 2 ppb XCD polymer product to enhance their carrying capacity. Their characteristics and commercial availabilities were also investigated. The 30 minutes filtrate volumes at 5 ppb, 10 ppb, 15 ppb and 20 ppb were obtained. The graph of concentrations versus the volume of the filtrate obtained was plotted. It was discovered that the concentration increases with decrease in volume of fluid loss and impermeable filtered mud cake was also obtained. Though, both gave good results, but the results of Annona muricata under the same conditions and concentrations were better than that of Carica papaya.
Evaluation of the Effects of Alcohol on De-Emulsification of Niger Delta Crude Oil Using Commercial De-Emulsifiers  [PDF]
K. C. Igwilo, S. T. A. Okolie, P. A. L. Anawe, Ogbudu Roland, Jude Odo
Open Journal of Yangtze Oil and Gas (OJOGas) , 2017, DOI: 10.4236/ojogas.2017.23013
Abstract: This research work evaluates the effects of alcohol on de-emulsification of Niger Delta crude oil using RP6000 and Chimec 2439 as de-emulsifiers. The laboratory measurements were carried out as per API standard. Stable emulsion was prepared using brine. The samples were de-emulsified. Methanol and ethanol were added respectively, with water and without water as modifiers. The measurements of the effect of adding alcohols on water separation efficiency were carried out using methanol to water ratio, M = 4:1 and ethanol water ratio, E = 4:1. The results show that solubility with alcohol is greater in emulsion than the solubility of alcohol without water. Some comparisons were also made based on the plots on percent water separation versus time for the two modifiers and de-emulsifiers. The maximum separation efficiency of 61% was obtained at concentration of 25% methanol, 75% RP6000, 20 ppm and Chimec 2439 gave maximum separation efficiency of 56.6% at concentration of 75%, 20 ppm at 120 minutes. Based on the results, methanol therefore gave larger effect on water separation efficiency than ethanol.
Afolashade Kuyoro,Okolie S. O.,Lawal O. A.,Aina Marshal A.
International Journal of Computers & Technology , 2012,
Abstract: Given the discouraging record of the traditional pension system and the limited coverage of the private-sector pension schemes, there is need for robust web-based pension fund management system that can handle the pension process efficiently. This work focus on the design and implementation of a web-based pension fund management application to replace the manual system, thus getting rid of the hurdles involved in the traditional pension management process.
Land-Use/Land-Cover Dynamics in Calabar Metropolis Using a Combined Approach of Remote Sensing and GIS  [PDF]
M. E. Awuh, M. C. Officha, A. O. Okolie, I. C. Enete
Journal of Geographic Information System (JGIS) , 2018, DOI: 10.4236/jgis.2018.104021
Abstract: This paper assessed the dynamics in the land use/land cover (LULC) within patterns of the land use/land cover (LULC) in Calabar metropolis. The thermal imageries for 2002, 2006, 2008, 2010, 2012, 2014 and 2016 were obtained and processed using remote sensing and Arc GIS software package in order to determine the changes that have occurred in the LULC in study area. The result of the LULC thematic maps overall accuracies was computed above 80 percent, which indicates an almost perfect agreement. The findings of this study reveal that, LULC classes by the year 2016 have assumed different dimensions of change from the sizes of their previous sizes in comparison to their current sizes. Land-use pattern changes in the study area were characterized by an increase in the built up class, waterbody (though with a slightly negative change from 2010 to 2012) and a predominant negative trend in dense vegetation and bare land classes; thus, indicating that the future changing trends will pose a depleting threat to the overall LULC. This study has shown that, the changing land use pattern of the area is capable affecting certain characteristics of the environment such as surface temperature. The study recommends that effort should be made by the government to increase urban vegetation around city centers and outliers by embarking on reforestation.
A Remote Sensing Analysis of the Temporal and Spatial Changes of Land Surface Temperature in Calabar Metropolis, Nigeria  [PDF]
M. E. Awuh, M. C. Officha, A. O. Okolie, I. C. Enete
Journal of Geographic Information System (JGIS) , 2018, DOI: 10.4236/jgis.2018.105030
Abstract: This study investigated the temporal and spatial changes of land surface temperature (LST) over Calabar Metropolis, Nigeria (2002 to 2016). The LST over Calabar metropolis was studied from the analysis of Landsat imageries of the investigated years (2002, 2006, 2008, 2010, 2012, 2014 and 2016). The results of the LST imagery were classified using standard deviation. GIS was further applied to extract the coverage ratio of each land use in the context of Land surface temperature (LST) pixels and results were presented in degree Celsius. The result of this study revealed a great variation in the mean LST for the selected period. The highest mean LST of 25.38°C was observed in 2016, followed by 2002 with mean LST of 25.32°C whereas, the least LST was observed in 2010. This study has shown that, the changing land use pattern of the area is capable of affecting certain characteristics of the environment such as surface temperature. The study recommends that effort should be made by the government to increase urban vegetation in order to reduce potential future increased in LST.
A Correlation Analysis of the Relationship between Land Use and Land Cover/Land Surface Temperature in Abuja Municipal, FCT, Nigeria  [PDF]
M. E. Awuh, P. O. Japhets, M. C. Officha, A. O. Okolie, I. C. Enete
Journal of Geographic Information System (JGIS) , 2019, DOI: 10.4236/jgis.2019.111004
Abstract: This study adopted Remote Sensing and GIS in assessing Land Use and Land Cover (LULC)/Land Surface Temperature (LST) variation in Abuja Municipal, FCT from 1986 to 2016. The thirty-year study period was chosen with the specific objective to determine the relationship between LULC and LST using a correlation analysis. Three Landsat TM/ETM+ images of the study area (1986, 2001 and 2016) were used to carry out the study. LULC was found to increase by 246.96 km2 (86.4%) in areal extent of built-up between 1986 and 2016; the spatial extent of the LST was found to increase on average from 23.5°C to 30.2°C. The correlation analysis showed a strong coefficient of determination (r2). The correlation analyses proved that the LULC classes were strongly related to LST. A strong correlation between the LULC classes and LST was observed at 0.8266, 0.9486, and 0.77 for 1986, 2001, and 2016. The coefficient of determination (r2) for 2016 was 0.77, being a strong indicator that a strong relationship existed implying that built-up areas were major drivers of the variation in the LST in Abuja Municipal. To promote thermal comfort in Abuja Municipal, urban planning, and control of building patterns tree-planting exercises are some of the recommendations made.
Some mineral profiles of fresh and bottled palm wine – a comparative study
M E Ukhun, N P Okolie, A O Oyerinde
African Journal of Biotechnology , 2005,
Abstract: Some mineral profiles of fresh palm wine and those of seven brands of bottled palm wine were analysed using atomic absorption spectroscopy and the values were compared. Three of the bottled samples contained toxic levels of either Pb or Cd or both. Neither metal was detected in fresh palm wine. Zn, Cr and Ni were 2 to 15 times higher while Cu was 2 to 5 times lower in bottled samples than values for fresh sample. The likelihood of water- derived heavy metal contamination during bottling, and its potential health implication for consumers are discussed.
Estimation of Annual Effective Dose Due to Ingestion of Natural Radionuclides in Cattle in Tin Mining Areas of Jos Plateau, Nigeria: Are Large Mammals Really Affected?  [PDF]
A. S. Aliyu, T. A. Mousseau, N. N. Garba, H. T. Abba, A. T. Ramli
Natural Science (NS) , 2015, DOI: 10.4236/ns.2015.74022
Abstract: We have read with great interest the paper which was published in Natural Science, 2014 issue number 6 titled “Estimation of annual effective dose due to ingestion of natural radionuclides in cattle in tin mining area of Jos Plateau, Nigeria” [1]. The paper motivated us to use state-of-the-art computational technique to investigate the risks of the tin mining activity in Jos-Plateau, Nigeria on large mammals (e.g. cattle). The Tier 2 Erica Tool assessment was used to estimate the total dose rate and risk quotients of these reference terrestrial animals. Our investigation revealed that the expected and conservative risk quotients of large mammals due to internal and external exposure to enhanced level of radioactivity are 0.05 and 0.16, respectively. Since the risk quotients are less than unity, this indicates that there is less than 5% probability that the screen dose rate (10 μGyh1) is exceeded. The estimated total dose rate to large mammals is 0.52 μGyh1 which is not statistically significant. A critical analysis of [1] is presented in the introductory part of this paper.
Comparison of Rectangular and Elliptical Control Region EWMA Schemes for Joint Quality Monitoring  [PDF]
A. M. Razmy, T. S. G. Peiris
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.411091
Abstract: The exponential weighted moving average technique used in process mean and variance monitoring charts was combined by Gan in 1997 and proposed two combined joint monitoring schemes one with rectangular control region and the other with elliptical control region. Performance of these two schemes may very depend on the shifts in mean or variance to be detected quickly. In this paper, performances of these two schemes are evaluated with respect to the average run length properties. The results reveal that elliptical scheme is little faster in detecting the shifts in process mean and increase in variance within a limit.
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