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Search Results: 1 - 10 of 219345 matches for " C. Akpor "
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Experiences and Challenges in the Use of Locally Sourced Materials in Electrical Distribution Systems in Nigeria
J.C. Ekeh,E.O. Ikwu,H.R.,Torru,C. Akpor
Journal of Engineering and Applied Sciences , 2012,
Abstract: In this study, a comprehensive survey is made on the state of the art of several important materials associated with electricity distribution systems in Nigeria. It presents estimate of percentage contributions of local contents in electrical distribution systems in Nigeria. The study identified about 50 items commonly used in power distribution system in Nigeria. It revealed that about 80% of these items could be locally sourced. The remaining 20% which included transformers and circuit breakers could be locally assembled. A number of challenges and opportunities in the emerging market in the distribution system are presented. The study will be of value to the manufacturers and power system engineers involve in the development and use of the local materials in power distribution systems.
An Application of Bootstrapping in Logistic Regression Model  [PDF]
Isaac Akpor Adjei, Rezaul Karim
Open Access Library Journal (OALib Journal) , 2016, DOI: 10.4236/oalib.1103049
Abstract:
Computer intensive methods have recently been intensively studied in the field of mathematics, statistics, physics, engineering, behavioral and life sciences. Bootstrap is a computer intensive method that can be used to estimate variability of estimators, estimate probabilities and quantile related to test statistics or to construct confidence intervals, explore the shape of distribution of estimators or test statistics and to construct predictive distributions to show their asymptotic behaviors. In this paper, we fitted the classical logistic regression model, and performed both parametric and non-parametric bootstrap for estimating confidence interval of parameters for logistic model and odds ratio. We also conducted test of hypothesis that the prevalence does not depend on age. Conclusions from both bootstrap methods were similar to those of classical logistic regression.
Studies on the effect of petroleum hydrocarbon on the microbial and physico-chemicals characteristics of soil
OB Akpor, OE Igbinosa, OO Igbinosa
African Journal of Biotechnology , 2007,
Abstract: The microorganisms capable of degrading crude oil are present in any conceivable environment. This study was aimed at ascertaining the bacteria and fungi that are able to survive in soils contaminated with 3 different petroleum hydrocarbon fractions (premium motor spirit ‘PMS’, domestic purpose kerosene ‘DPK’ and automotive gas oil ‘AGO’). Soil surface samples (0.5 cm) were collected randomly from different locations in Ile-Ife in Osun State of Nigeria. Soil samples were contaminated with the hydrocarbon fractions in a ratio of 1:1 and estimated for total bacterial counts (TBC), total fungal counts (TFC), and total hydrocarbon utilizing bacterial counts (HYCUB). The following anions and cations were also determined in the soil samples; Ca2+, Mg2+, K+, Na+, NO3 +, and NO2 +. The results showed that TBC ranged from 2.1 x 103 to 3.6 x 106 cfu/g, while TFC was in the range of 0 to 2.0 x 103 cfu/g and HYCUB was in the range of 4.8 x 101 to 4.5 x 103 cfu/g. Apart from average HYCUB counts that was highest in DKP samples, other counts were highest in the PMS samples. Similar bacteria of diverse species were isolated from the contaminated soil samples, although their months of occurrences and numbers differed, Mg2+, K+ and Na+ all increased in all the contaminated soils, at the end of the study. In this study, the HYCUB counts were negatively correlated with Ca2+ (r = -0.667, p<0.05). This study revealed a significant correlation between total fungal counts and hydrocarbon-utilizing bacterial counts (r = 0.700, p< 0.05) and a negative correlation between total bacterial counts and Na+ (r = -0.677, p< 0.05). The results of the study has revealed that refined petroleum can have an increasing or decreasing effect on soil physico-chemical characteristics, and that some of these physico-chemical characteristics may have effect on microbial counts.
The effects of pH and temperature on phosphate and nitrate uptake by wastewater protozoa
OB Akpor, MNB Momba, JO Okonkwo
African Journal of Biotechnology , 2008,
Abstract: The objective of this study was to ascertain the effects of pH and temperature on nutrient uptake efficiency of 3 wastewater protozoan isolates (Aspidisca (A), Trachelophyllum (B) and Peranema (C)) that have previously been screened for nutrient uptake ability. The study was carried out in shake flask at pH 5, 6, 7, 8 and 9 and incubation temperatures of 25, 30 and 35oC for 96 h. The results revealed optimum pH ranges for the uptake of phosphate and nitrate to be 7 to 9 and 5 to 7, respectively. Maximum nutrient uptake was found to occur at 25oC with phosphate concentration decreasing from 64.74 to 10.21 mg/l, 63.09 to 8.54 mg/l and 64.47 to 6.36 mg/l, for isolates ‘A’, ‘B’ and ‘C’, respectively. Also, nitrate concentration was found to decrease from 24.71 to 4.91 mg/l for isolate ‘A’, 24.47 to 11.15 mg/l for isolate ‘B’, and 24.58 to 15.00 mg/l for isolate ‘C’ at the same temperature. An increase in COD was observed in mixed liquor inoculated with the test isolates. The study has been able to give an insight into the optimum temperature and pH for phosphate and nitrate uptake by the isolates.
The Impact of Socio-Cultural Environment on Entrepreneurial Emergence: An Empirical Analysis of Nigeria Society
Masoje Oghenerobaro Mamuzo Akpor-Robaro
Management Science and Engineering , 2012, DOI: 10.3968/j.mse.1913035x20120604.3620
Abstract: The paper presents an analytical and evaluative study of the impact of socio-cultural environment on entrepreneurial emergence. The study uses as reference case, the socio-cultural characteristics of Nigerian society and their role in the emergence of entrepreneurs in Nigeria. A survey research design was adopted and data collected through the instruments of questionnaire and personal interview. The study revealed that the Nigerian socio-cultural characteristics, in some ways, have provided impetus for entrepreneurial emergence among Nigerians, but in some other ways, have enormously hindered the emergence of entrepreneurs. This disproves the general notion that the Nigerian society absolutely does not provide opportunities for entrepreneurial emergence. The paper concludes that, in general, socio-cultural environment significantly impact on entrepreneurial emergence in society. Beyond the negative or adverse socio-economic circumstances of individuals, the culture and value system of a people is a great determinant of the desire and capacity of people becoming entrepreneurs. The paper therefore, recommends that certain traditions and values in society which have remained barriers to people particularly women becoming entrepreneurs must be dropped or modified to pave way for the emergence of entrepreneurs among men and women in Nigeria and other societies. Key words: Impact; Entrepreneurial emergence; Socio-cultural environment; Value re-engineering and re-orientation
The Impact of Globalization on Entrepreneurship Development in Developing Economies: A Theoretical Analysis of the Nigerian Experience in the Manufacturing Industry
Masoje Oghenerobaro Mamuzo Akpor-Robaro
Management Science and Engineering , 2012, DOI: 10.3968/j.mse.1913035x20120602.2551
Abstract: The paper examines the globalization phenomenon and its impact on entrepreneurship development in developing economies. It appreciates the various perspectives of globalization concept, however, it narrows the discussion to economic globalization and globalization of business in particular. A focus on the implications of globalization for entrepreneurship development in developing countries is imperative, in view of the role of entrepreneurship as the engine of economic growth,and also, considering the apparent controversy about the role of globalization in national economic growth and development which is polarized between a positive perspective and a negative perspective. The paper presents a critical analysis and appraisal of the impact of globalization on entrepreneurship in Nigeria. The analysis is founded on a blend of scattered observations and some qualified reasoning based on information from literature on indigenous entrepreneurship and economic/industrial activities, since the past one decade when the gospel of globalization began; and the relationship between globalization and entrepreneurship. The analysis reveals that globalization has both positive and negative implications for entrepreneurship development, however it is noted that for developing economies, the negative impact far outweigh the positive impact. It is therefore recommended that developing countries must make conscious effort to engage economic policies and measures to manage the influence of globalization on entrepreneurship development, in a way that reduces the negative impact and promotes the positive impact. In conclusion, the paper emphasizes that developing countries must operate a selective or guided open system with regards to business entry into their economies from outside, to guard against market adverse effect due to globalization. Key words: Globalization; Entrepreneurship development; Impact guided open system; National economic growth and development
Challenges in Meeting the MDGs: The Nigerian Drinking Water Supply and Distribution Sector
O.B. Akpor,M. Muchie
Journal of Environmental Science and Technology , 2011,
Abstract: The provision of clean drinking water and discharge of adequately treated wastewater is a fundamental requirement for human life. The lack of access to clean water is a serious health concern. According to reports, worldwide, over a million deaths per year have been attributed to unsafe water and poor sanitation, with close to 90% of these deaths occurring in children under five years of age. This study was therefore, aimed at reviewing and evaluating the Nigerian drinking water supply and distribution sector, with particular reference to the historical perspective and organization structure; water law and profile in respect to meeting the millennium development goal target for improved water supply and distribution. Although there is temporal and spatial variation in water availability between the North and the South in Nigeria, the country is considered to be abundantly blessed with water resources. Nigeria has a national water supply policy, whose objective is to ensure adequate, affordable and sustainable access to safe drinking water for all citizens. Despite the existence of several government agencies, whose roles are to enhance efficient water supply and distribution to all citizens in Nigeria, current access to improved drinking water in Nigeria is still low, with improved water supply and increasing from 47% in 1990 to 58% in 2008. According to report, Nigeria water supply situation has not kept pace in meeting the millennium development goal target of 75% coverage for safe drinking water. For improved water supply coverage, there is the need for enforceable water legislation, building of institutions and policies related to water resource planning, development and management, demand management and privatization of the water supply and distribution sector. Through deliberate reorganization of socioeconomic policies regarding the water supply sector, a significant increase in the proportion of people with access to improved drinking water source can be attained.
Stakeholders’ Participation in Water Management: A Case Study of the Msunduzi Catchment Management
Boakye M. K.,Akpor O. B.
Journal of Sustainable Development , 2012, DOI: 10.5539/jsd.v5n6p104
Abstract: Public participation is widely accepted as a critical component of managing water resources in South Africa; hence it is strongly emphasized in the South African National Water Act. Although the importance of an enabling legislation and policy on public participation is highly appreciated; this is not sufficient enough to support meaningful participation of the public, particularly those from disadvantaged communities. This study was therefore aimed at investigating the extent of participation of previously disadvantaged communities in water management. To achieve this objective, the study employed a qualitative approach that involved the use of primary and secondary data sources. The results obtained revealed the lack of meaningful participation by disadvantaged communities in water management decisions. This is because the majority of individuals that may have interest in water resource management are excluded in such decisions at the community level. It was also observed that the organizations that attended the forum do not interact with their community, hence did not serve as intermediaries between the South African Department of Water Affairs (DWA) and their communities. The reliance of the DWA on community organizations in catchment is ineffective. In addition, the few participants from disadvantaged communities who are part of the forum do not understand the technical nature of information presented. It is therefore important that more emphasis be placed on the development of skills and capacity of participants to understand and make meaningful contributions, especially those from the disadvantaged communities.
Phosphorus and Nitrate Removal by Selected Wastewater Protozoa Isolates
O.B. Akpor,M.N.B. Momba,J. Okonkwo
Pakistan Journal of Biological Sciences , 2007,
Abstract: In the present study, the efficiency of ten selected wastewater protozoa in the removal of phosphorus and nitrogen and their effects on other physico-chemical parameters was investigated. Protozoa were isolated from the aerobic zone of Daasport wastewater treatment plant, in Pretoria, South Africa, using the modified Chalkey’s medium. The isolates were screened for nutrient removal ability in shake flasks, at laboratory temperatures for 96 h. During each sampling, aliquot samples were collected for the analysis of phosphorus, nitrate-nitrogen, Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), pH, of the mixed liquor including the growth rate of the isolates using standard methods. The results indicated a steady increase in growth rate of the isolates and all the isolates used in this study showed some measure of phosphorus and nitrate removal ability. In the presence of the test protozoa isolates, an increase in COD and a decrease in DO were noted in the mixed liquor inoculated with the organisms, while the pH only increases slightly. This study revealed a significant correlation between growth rate and nutrient removal (R = -0.806, p<0.001 for phosphorus; R = -0.799, p<0.01 for nitrate). The present study has been able to show that certain protozoa isolates have the ability to biologically remove phosphorus and nitrate from effluent. Consequently, it would be necessary to identify what strains of protozoa are capable of excess phosphorus and nitrogen uptake for the treatment of wastewater.
Effect of Nutrient/Carbon Supplements on Biological Phosphate and Nitrate Uptake by Protozoan Isolates
O.B. Akpor,M.N.B. Momba,J. Okonkwo
Journal of Applied Sciences , 2008,
Abstract: This study was aimed at investigating the effect of nine different nutrient/carbon supplements in mixed liquor on nutrient uptake ability of three wastewater protozoan isolates, which have previously been screened for phosphate and nitrate uptake efficiency. The results revealed that over 50% of phosphate was removed in the presence of sodium acetate, glucose or sucrose. Similarly, nitrate uptake of over 60% was observed in the presence of sodium acetate, sodium succinate, glucose or sucrose. These trends were common in all the isolates. Chemical Oxygen Demand (COD) removal in the mixed liquor was only found to be significantly removed in mixed liquors that were supplemented with glucose, sucrose or sodium succinate. In the presence of sodium acetate, COD was observed to increase. The findings of this investigation have revealed that nutrient uptake and COD removal by the test protozoan isolates may be dependent primarily on the initial nutrient supplement in mixed liquor.
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