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Uruobo-Okija, Nigeria

Egu D.I.,Madonna University of Nigeria
38th Nigeria Annual International Conference and Exhibition, NAICE 2014 - Africa's Energy Corridor: Opportunities for Oil and Gas Value Maximization Through Integration and Global Approach | Year: 2014

Investment and operational planning of gas field development under severe uncertainties in gas reserves poses a major challenge in post parts of Eocene Niger Delta. Such uncertainties include the size of gas in the reservoir, the recovery factor, the required number of wells to be drilled, permeability variations and other criteria. Fekete "FAST" Evolution software was used to run a detailed sensitivity analysis of reservoir properties particularly permeability, in order to determine the number of wells to drill, recovery factor, net present value (NPV) and also the sales of gas produced per well, to effectively ensure maximum hydrocarbon recovery and a good return on investment without posing danger to the reservoir. Results however showed that in terms of recovery factor, scope three had a maximum recovery factor of about 73.61%, in terms of sales gas produced per well. It also had the highest sales gas production of about 10811.5M$, which will yield about 32434.4M$ for the three number of wells investigated as a result of a higher permeability. Also in terms of the net present value, scope one had the highest value of 110633.06M$, for the 12 numbers of wells investigated. It is recommended that since scope three had a better performance than the base case due to higher permeability value, a stimulation job may be carried out at the completion of the project to enhance the permeability of the reservoir, but the cost of carrying out the stimulation job should be considered and analyzed to ensure a good return on investment, before embarking on the decision. Copyright 2014, Society of Petroleum Engineers. Source

Pius U.O.,University of Nigeria | Gloria N.C.,Madonna University of Nigeria
Der Pharma Chemica | Year: 2016

A simple and sensitive spectrophotometric method is described for the quantitative determination of erythromycin. The method is based on charge transfer complexation reaction of, erythromycin as n-electron donor with 2, 3 dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as π-acceptor to give highly coloured complex with 1:1 stoichiometric ratio. The coloured products were quantified at 464nm under the optimized experimental conditions. Beer's law is obeyed over the concentration ranges of 5-150μg/ml. The apparent molar absorptivity was calculated to be 1.27 × 103Lmol-1cm-1 and corresponding Sandell sensitivity of 1.56. The limit of detection and quantification were 2.1and 6.4 respectively. The proposed methods were applied successfully to the determination of erythromycin in pure and commercial forms with good average recovery of 105.4 %. Statistical comparison of the result was performed with regards to accuracy and precision using student's t-test and f-test at 95% confidence level. Source

Tomaszewski R.,Madonna University of Nigeria
International maritime health | Year: 2012

The term "cardiomegaly" is found in 5-7% of chest X-ray film evaluations in tropical Africa. However, "cardiomegaly" is a descriptive term, devoid of any aetiological meaning. Therefore, providing information about the aetiological factors leading to heart enlargement in a group of Africans (Nigerians) was the purpose of this study. In the years 2002-2011, 170 subjects (aged 17-80 years, mean age 42 years) in whom "cardiomegaly" was revealed by chest radiographs were studied at the Madonna University Teaching Hospital, Elele. The patients underwent echocardiography, electrocardiography, and several appropriate laboratory tests. Arterial hypertension was found to be most frequently associated with heart enlargement (39.4%), followed by dilated cardiomyopathy (21.76%), endomyocardial fibrosis (14.1%), valvular defects (9.4%), cardiac enlargement in the course of sickle-cell anaemia (6.47%), and schistosomal cor pulmonale (3.52%). This study is a contribution to a better aetiological elucidation of "cardiomegaly" in the tropics and emphasizes the importance of arterial hypertension as one of its causative factors. The dire need for effective treatment of hypertensive patients becomes evident. A high prevalence of elevated blood pressure seems to reflect an impact of civilization-related factors on the African communities. Source

Ozuomba J.O.,Madonna University of Nigeria | Ekpunobi A.J.,Nnamdi Azikiwe University | Ekwo P.I.,Nnamdi Azikiwe University
Chalcogenide Letters | Year: 2011

The paper reports on the fabrication and characterisation of a dye sensitized solar cells using chlorin (Ch)-stained titanium (iv) oxide (TiO 2). A second bare or plain cell which serves as a control was fabricated using unstained TiO 2. The chlorine dye was extracted from bahama grass. Thin films of Ch-strained TiO 2 and unstained TiO 2 were deposited on transparent conducting oxide glass using the blade method. The Ch-stained electrode was found to absorb solar radiation both in the UV and VIS region. The photoelectric energy conversion efficiency was found to be 1.00% and 0.03% for Ch-stained and bare electrodes respectively. The diurnal variation of output power for both cells was carried out for three days. The efficiency of the stained cell can be compared with 1.43% obtained by Suri et al and 1.5% recorded by Law et al. Results of the hourly output power obtained for the three days revealed that the local dye can make a good photo sensitizer but would require further treatment to improve on its optical absorbance and stability under exposure to solar irradiation. Source

Orisakwe O.E.,University of Port Harcourt | Igweze Z.N.,Madonna University of Nigeria | Okolo K.O.,Madonna University of Nigeria | Ajaezi G.C.,Rivers State University of Science And Technology
Tobacco Control | Year: 2014

Background: Interest is rising in smokeless tobacco as a safer alternative to smoking. Information on the heavy metal hazards of smokeless tobacco is sparse in Nigeria, as it is in most sub-Saharan Africa countries. This study assesses the heavy metal hazards of the smokeless tobacco types commonly available in Nigeria.Methods: Using a market basket protocol 30 Nigerian smokeless tobacco types were studied. Digestion was performed by addition of 10 mL of a mix of nitric and hydrochloric acids (HCl:HNO3, 3:1); the mixture was then heated to dryness. Then, 20 mL deionised water was added, and the mixture stirred and filtered. The filtrate was made up in a standard volumetric flask and lead, cadmium, chromium, cobalt and nickel concentrations were assayed with atomic absorption spectrophotometry at 205 Å. The daily intake and target hazard quotient (THQ) were calculated.Results: Chromium, cobalt and nickel concentrations ranged from 2.77–11.40, 0.01–0.03 and 0.02– 0.07 μg/g, respectively, whereas lead and cadmium ranged from 0.00–2.48 and 0.01–0.17 μg/g, respectively. The daily intake of chromium, cobalt and nickel ranged from 277–1140, 1–3 and 2 to 7 μg/day, respectively. Lead and cadmium daily intakes ranged from 0–248 and 1–17 μg/day, respectively.Conclusions: Although there was no apparent risk when each metal was analysed and considered individually, the potential risk could be multiplied when considering all heavy metals. The high heavy metal content in Nigerian smokeless tobacco may have public health implications. © 2014 BMJ Publishing Group.All rights reserved. Source

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