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Effects of ORC Working Fluids on Combined Cycle Integrated with SOFC and ORC for Stationary Power Generation  [PDF]
Osagie Matthew, Sen Nieh
Energy and Power Engineering (EPE) , 2019, DOI: 10.4236/epe.2019.114010
Abstract: The purpose of this study is to explore the effects of working fluid on conventional combined cycle integrated with pressurized solid oxide fuel cell (SOFC) and waste heat recovery organic Rankine cycle (ORC) for stationary utility power generation. The mathematical model of a natural gas fueled design configuration is developed in Matlab and Simulink and simulated with 14 working fluids. The effluent gases of SOFC undergo combustion in the combustion chamber and it is utilized in the gas turbine, steam turbine cycle and ORC. The model is compared with those found in literature and the parametric studies of temperature, flow rate, fuel utilization factor and exhaust gas on the system efficiency are examined. Results revealed that working fluids show a closely related behavior in efficiency at low pressure ratio and high flow fraction, fuel utilization, and temperature. R-123 was found to perform the best among 14 working fluids studied, yielding a system energy efficiency of 70% in the combined cycle integrated with SOFC and ORC.
Community Based Health Insurance Knowledge and Willingness to Pay; A Survey of a Rural Community in North Central Zone of Nigeria
ME Banwat, HA Agbo, Z Hassan, S Lassa, IA Osagie, JU Ozoilo, C Ogbonna
Jos Journal of Medicine , 2012,
Abstract: Introduction: A Community-Based Health Insurance Scheme (CBHI) is any program managed and operated by a community-based organization that provides resource pooling and risk-sharing to cover the costs of health care services. CBHI reduces out of pocket expenditure and is the most appropriate insurance model for rural areas where incomes are unstable. The recent ''health care crisis'' has led to the emergence of many CBHI in developing countries of sub-Saharan Africa. This study aimed to explore the knowledge of and Willingness to pay for CBHI in a rural community in Plateau State. Methods: Using multi-stage sampling technique, 450 adult subjects were recruited for the study. Data was gotten from them using an interviewer administered structured questionnaire and was analyzed using EPI-info statistical software version 3.5.2. Chi-square test was used to show relationship between demographic features and outcome variables. Results: Seventy one percent of respondents had a good knowledge of CBHI was l (28.7%) with the mass media being their main source of information (53.3%). About 91.5% of subjects are not members of any health scheme while 93.6% percent were willing to pay into a CBHI scheme. Thrift collection was the preferred method of financing the social insurance scheme in the community. Knowledge on CBHI and Willingness to pay was higher in more educated, single subjects. Conclusion: Knowledge of CBHI was low among the studied populace although the willingness to pay was encouragingly high. This willingness needs to be promptly harnessed by Community leaders and health workers to improve access to Health Care by the vulnerable rural populace.
Adsorption of Benzene in Batch System in Natural Clay and Sandy Soil  [PDF]
EbuwaI Osagie, Chiedu N. Owabor
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53037
Abstract: The adsorption potential of clay and sandy soil to remove benzene from liquid-phase system was examined. A series of batch adsorption tests were carried out for various concentrations of benzene (50 - 250 mg/l) in tightly corked 1000 ml flasks for clay and sandy soil, respectively. Equilibrium and kinetics data were obtained from the batch experiments. Adsorption increased with increasing initial benzene concentration. The equilibrium data obtained from the adsorption of benzene were well fitted to the Freundlich isotherm model. The adsorption kinetics process showed that the kinetic model of pseudo second-order was the best fit to the experimental data. The results showed that clay and sandy soil had good potential for the removal of aromatic hydrocarbon, benzene from aqueous solution.
Adsorption of Pyrene from Aqueous Solution by Clay and Sandy Soil  [PDF]
Ebuwa I. Osagie, Chiedu Owabor
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.54049
Abstract: The adsorption behaviour of pyrene using clay and sandy soil under ambient conditions is investigated in this study. Adsorption equilibrium isotherms and adsorption kinetics experiments were carried out in solutions of pyrene concentrations (50 - 250 mg/l) by using clay and sandy soil as adsorbents. Adsorption models were used to predict the mechanisms involved. The adsorption kinetics data best fitted the pseudo-second order kinetic model. The isotherm model which best represented the data obtained was the Langmuir model. The adsorption from the aqueous solution was observed to be time dependent and equilibrium time was found to be 34 and 28 hours for clay and sandy soil, respectively. The rate of adsorption using the pseudo-second order rate expression for pyrene was 0.00088 and 0.00085 min-1 for clay and sandy soil, respectively.
Adsorption of Naphthalene on Clay and Sandy Soil from Aqueous Solution  [PDF]
Ebuwa I. Osagie, Chiedu N. Owabor
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53036
Abstract: The adsorption behavior of naphthalene using clay and sandy soil as adsorbents is examined under ambient conditions. The adsorption equilibrium of naphthalene on clay and sandy soil was evaluated by the Langmuir, Freundlich and Tempkin isotherms. The results showed that the equilibrium data for naphthalene fitted the Freundlich model best within the concentration range studied for both clay and sandy soil. Experimental results showed that the time taken to attain adsorption equilibrium for naphthalene was 26 hrs and 20 hrs for clay and sandy soil, respectively. Among the tested kinetic models in this study, the pseudo-second order successfully predicted the adsorption process.
Biochemical Assessment of the Relationship of Zinc and Glucose Concentration in Diabetics  [PDF]
Gborienemi Simeon George, Osagie Endely Friendgood
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2018, DOI: 10.4236/ojemd.2018.84012
Abstract: Zinc plays a critical role in a variety of cell functions and elicits the fact that both its deficiency and excess may demonstrate deleterious situation. It has been proposed that zinc is required for multiple steps in insulin synthesis and release. This study investigated the relationship of zinc and glucose in diabetics. Using serum samples of diabetic patients whose glucose concentrations were above the threshold (10.0 mmol/l), spectroscopic methods were used to determine the concentration of glucose and zinc. Results obtained showed a negative correlation between level of glucose and zinc. Data were analyzed using student’s t-test with the aid of Graph Pad Prism (R) version 6.01 with a p value of <0.05 considered statistically significant. We concluded that reduced concentration of zinc observed in the study could be an uncommon factor to hyperglycemia and impose risk factor to diabetics. Its evaluation along with glucose levels is highly recommended in management of diabetic patients.
Mycoflora of sun-dried sweet potato (Ipomoea batatas L.) slices in Benin City, Nigeria
FI Okungbowa, M Osagie
African Journal of Biotechnology , 2009,
Abstract: A study was carried out to isolate and quantify the fungi present in sun-dried sweet potato slices in Benin City, Nigeria. Potato tubers were peeled, washed, sliced and sun-dried for 30 days. Oven-dried slices served as control. Meteorological data were obtained for the period of study. Fungal colonies on slices were counted with the aid of a hand lens and the average number of colonies calculated. The relative density of each fungus was determined by plating on potato dextrose agar and incubating for 7 days at ±28°C. Fungi were isolated and identified and colony forming unit (cfu) determined. Results revealed 12 fungal species, whereas the control had no fungal growth. Isolated fungi were Botryodiplodia theobromae, Rhizopus stolonifer, Mucor mucedo, Aspergillus niger, A. fumigatus, A. flavus and Penicillium digitatum in May (relative density = 5.5-29.4%). A. ochraceus, Curvularia sp. and Neurospora sitophila were isolated in June in addition to the above fungi (relative density = 2.1 - 23.2%). Eight fungi were isolated in July (relative density = 2.6 - 26.8%). The cfu ranged from 2.8 x 106 - 11.6 x 106 in May, 1.9 x 106 - 9.1 x 106 in June to 4.1 x 106 - 11.3 x 106 in July. Other means of drying such as tunnel dryers (operated at 60 - 70°C) and drum-drying are recommended.
Sugar and macrominerals composition of sap produced by Raphia hookeri palms
FI Obahiagbon, AU Osagie
African Journal of Biotechnology , 2007,
Abstract: Mature Raphia hookeri palms located in the experimental fields of the Nigerian Institute For Oil Palm Research Nigeria were selected, and tapped daily at the base of the inflorescences. The exudates (saps) were collected and the sugars and macromineral composition were determined. Maximum sucrose quantity (9.5%) was obtained about 28 days after initiation of tapping. The sucrose concentration was correlated with the sap volume. Sodium, potassium, calcium, magnesium, phosphorus and nitrogen were present in the varied concentrations throughout the duration of the tapping operation. The concentration of the macrominerals were of the order of K>Mg>N>P>Na. Statistically, significant differences (P<0.05) were observed between the macrominerals detected in the various saps. Heavy metals like mercury, cadmium, selenium and lead were not detectable in the sap.
Antioxidant Properties of Methanolic Extracts of some Nigerian Plants on Nutritionally-Stressed Rats
ES Omoregie, AU Osagie
Nigerian Journal of Basic and Applied Sciences , 2012,
Abstract: The antioxidant properties of methanolic extracts of six locally consumed plants in Nigeria were comparatively evaluated both in vitro and in vivo. The plants included V. amygdalina (bitter leaf); C. rubens (‘ebolo’); A. hybridus (‘tete’); J. tanjorensis (jatropha); G. africana (‘okazi’) and T. triangulare (water leaf). The in vitro study indicate that the DPPH radical scavenging activity was highest (p<0.05) in ebolo and water leaf. The proanthocyanidin content was significantly higher (p<0.05) in ebolo and tete. Jatropha extract has the highest phenolic content. Flavonoid content is significantly high (p<0.05) in jatropha and water leaf extracts. In vivo study of the effect of the extracts, on nutritionally stressed male albino rats, show that the liver and kidney tissues of rats fed the protein deficient diet (PDD) had significantly lower (p<0.05) superoxide dismutase (SOD), catalase (CAT), vitamin E, vitamin C levels and higher lipid peroxidation levels when compared with the control. However, supplementation of the PDD diet with the various extracts resulted in significantly higher (p<0.05) levels of SOD, CAT, vitamin E, vitamin C and reduced lipid peroxidation relative to the PDD group. Likewise, feeding of normal rats with the extracts resulted in higher levels of these parameters when compared with the control. The results suggest that the plant leaves possess varied degrees of antioxidant activity both in vitro and in vivo.
Federal Government Funding of Research in Universities in Nigeria, the University of Benin as a Case Study
Roseline O. Osagie
International Education Studies , 2012, DOI: 10.5539/ies.v5n6p73
Abstract: It is increasingly evident that research is extremely critical and important if universities are to serve as engines of development in their areas of locations. For a knowledge-driven world, investment in research and development (R&D) is a sine qua non for a nation. Few studies have examined the federal government’s investment in research in her universities. Furthermore, there is no available evidence of studies on the federal government funding of teaching and research equipment in universities in Nigeria. This study, therefore, investigated the federal government funding of research, teaching and research equipment at the University of Benin. Four research questions were posed to guide the study. The findings showed that less than 5% of the total recurrent revenue was allocated for research at the University of Benin during the 1992/93 to 1996/97 academic sessions. The findings indicated that the federal government is not making a robust investment in research and therefore Nigeria is not developing. Hence its economic quagmire. This paper, therefore, canvassed for the revitalization of research in universities in Nigeria as a means of fast-tracking its economic development.
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