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Forced Convection Thermal Boundary Layer Transfer for Non-Isothermal Surfaces Using the Modified Merk Series  [PDF]
Ayodeji Falana, Richard Olayiwola Fagbenle
Open Journal of Fluid Dynamics (OJFD) , 2014, DOI: 10.4236/ojfd.2014.42018
Abstract:

The Chao and Fagbenle’s modification of Merk series has been employed for the analysis of forced convection laminar thermal boundary layer transfer for non-isothermal surfaces. In addition to the Prandtl number (Pr) and the pressure gradient (∧), a third parameter (temperature parameter, γ ) was introduced in the analysis. Solutions of the resulting universal functions for the thermal boundary layer have been obtained for Pr of 0.70, 1.0 and 10.0 and for a range of ∧ . The results obtained for the similarity equations agreed with published results within very close limits for all the ∧’s investigated.

A Study of Implementation of Preventive Maintenance Programme in Nigeria Power Industry – Egbin Thermal Power Plant, Case Study  [PDF]
Sunday Olayinka Oyedepo, Fagbenle Richard Olayiwola
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.33027
Abstract: Preventive Maintenance Programme consists of actions that improve the condition of system elements for performance optimization and aversion of unintended system failure or collapse. It involves inspection, servicing, repairing or replacing physical components of machineries, plant and equipment by following the prescribed schedule. It is commonly agreed nowadays that preventive maintenance programme can be very successful in improving equipment reliability while minimizing maintenance related costs. The availability of a complex system, such as steam turbine power plant is strongly associated with its parts reliability and maintenance policy. That policy not only has influence on the parts’ repair time but also on the parts’ reliability affecting the system integrity, degradation and availability. The objective of this paper is to study the effects of Preventive Maintenance Programme (PMP) implementation on the performance of the Egbin 1320 MW thermal power plant in Nigeria. This paper considers the reliability and availability of the 6 x 220 MW steam turbine units installed in the power station. The reliability and availability of the turbines are computed based on a five-year failure database. The availability analysis of available data from 2005 to 2009 shows different results for each unit and variation in availability for different year: availability of unit1 varies between 59.11 to 91.76%; unit 2, 64.02 to 94.53%; unit 3, 28.79 to 91.57%; unit 4, 80.31 to 92.76% and unit 5, 73.38 to 87.76%. Unit 6 was out of service for the past 2 to 3 years. This indicates differences in their systems installation maintenance and operation.
A Review of Performance Appraisals of Nigerian Federal Government-Owned Refineries  [PDF]
Ismaila Badmus, Miracle Olanrewaju Oyewola, Richard Olayiwola Fagbenle
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.41007
Abstract: The aim of this paper is to review previous works on the performance appraisal of Nigerian government-owned refineries. The review has been done in a general sense, covering appraisal works by engineers, scientists, management experts, economists, sociologists and even historians. The outcome indicates that while there seems to be several works directly and/or indirectly assessing the performance of the refineries in a general sense, there is a dearth of such in the specific area of energy consumption. There also appears to be no single one appraising energy utilisation of all the refineries at the same time in the open literature. This is in spite of the fact that refining processes are energy intensive. Despite popularisation of exergy analysis as a veritable tool, the only energy utilisation appraisal within our reach which was carried out on just one of the refineries has not been done exergetically. However, the work still reveals, within the limitations of 1st Law energy analysis that the energy consumption patterns are below international benchmarks in the oil and gas industry. Some suggestions have also been offered to take care of the energy efficiency challenges in these refineries. These include plant to plant analyses of energy utilisation patterns in the four refineries, periodical determination of GHG emission levels in the refineries using current international best practices as benchmarks, use of exergy analysis to check avoidable energy wastage in the refining processes, shifting refinery fuelling pattern in favour of low carbon content fuels like natural gas and ensuring regular turnaround maintenance of the system.
Magnetic Field Enhancement in Ammonia-Water Absorption Refrigeration Systems  [PDF]
Moradeyo K. Odunfa, Richard O. Fagbenle, Olanrewaju M. Oyewola, Olayinka S. Ohunakin
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.64007
Abstract:

Absorption enhancement has been considered as an effective way of improving coefficient of performance (COP) of refrigeration systems and magnetic enhancement is one of these methods. A model of magnetic field enhancement in ammonia-water absorption systems is presented in this paper. A numerical model using finite difference scheme was developed based on the conservation equations and mass transport relationship. Macroscopic magnetic field force was introduced in the momentum equation. The model was validated using data obtained from the literature. Changes in the physical properties of ammonia solution while absorbing both in the direction of falling film and across its thickness were investigated. The magnetic field was found to have some positive effect on the ammonia-water falling film absorption. The results indicate that absorption performance enhancement increased with magnetic intensity. The COP of simple ammonia solution absorption refrigeration system increased by 1.9% and 3.6% for magnetic induction of 1.4 and 3.0 Tesla respectively.

An Improved Algorithm for the Solution of Generalized Burger-Fishers Equation  [PDF]
Morufu Oyedunsi Olayiwola
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.510154
Abstract: In this paper, an improved algorithm for the solution of Generalized Burger-Fisher’s Equation is presented. A Maple code is generated for the algorithm and simulated. It was observed that the algorithm gives the solution with less computation. The solution gives a better result when compared with the numerical solutions in the existing literature.
Overview of Energy and Environmental Issues in the Passenger Automobile Industry  [PDF]
Olaleye Michael Amoo, R. Layi Fagbenle
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.14010
Abstract: The global supplies of petroleum are on the decline and the dwindling resource has become increasingly difficult to access. Improved technology is increasingly been required to access petroleum that is in hard to reach geographical environments and has chemical composition that is not entirely compatible with existing processing techniques. Alternative energy involves energy from renewable and non-depleting sources such as wind and solar, offer many opportunities for research and development and are been widely developed globally. These sources of energy are expected to reduce the threat of a changing climate, air pollution and oil dependence caused by the automobile industry. There are many economic, environmental and societal benefits of employing various alternative energy sources or options in the passenger automobile industry for motive power. Transitioning from a monoculture of hydrocarbon-based transportation will be just as signify- cant as investments in research and development needed to develop a portfolio of cost-competitive and safe alternative powertrain technologies that can effectively retire the fossil fueled internal combustion engine, without much of any economic stress. In this work, we couple energy and environmental issues to obtain a realistic indication of the future of alternative powertrain technologies for the future of the passenger automobile industry.
Breast self examination practices among female secondary school teachers in a rural community in Oyo State, Nigeria  [PDF]
Joel Olayiwola Faronbi, Janet Abolade
Open Journal of Nursing (OJN) , 2012, DOI: 10.4236/ojn.2012.22017
Abstract: The objective of the study was to assess female secondary school teachers’ knowledge and attitude of breast self examination (BSE) and to describe the extent of practice of breast self examination among them. This study employed a descriptive design and data was collected with the aid of validated semi structured questionnaire from 100 female teachers in all the five secondary schools in Oko, Oyo State, and analysis was done using Statistical Package for Social Sciences. The result showed that 82% of the respondents were aware of breast self examination practices and their source of this information was from mass media (55%) and friends (25%). Fifty-four respondents had poor knowledge of BSE and 48% had negative attitude towards practice of BSE and majority (62%) had a low practice. The study however, revealed that majority of the respondents who practice BSE do not know what to look for. The results further showed that, there is no significant relationship between age of the respondents and their awareness (X2 = 8.322; p = 0.0800; df = 4) and knowledge (X2 = 14.501; p = 0.264 and df = 8) of breast self examination. This study concluded that there is poor knowledge and attitude towards BSE practice among the secondary school teachers in Oko community and with unsatisfactory practice. It therefore, suggests that breast awareness campaign and self efficacy development is important for teachers in secondary schools to aid early detection and better prognosis of breast cancer in this community, and this will have a multiplier effect on female secondary school girls.
Beyond Hollywood Formulas: Evolv ng Indigenous Yoruba Film Aesthetics
Abiodun Olayiwola
Cross-Cultural Communication , 2011, DOI: 10.3968/1604
Abstract: Home video scholarship is an emerging aspect of theatre studies in Nigeria. While previous studies have been merely critical of Nigerian film practitioners’ inability to evolve an indigenous form, they have failed in prescribing necessary strategies for achieving this. This study, therefore, fills this gap by proposing devices for evolving an indigenous meta-language for the Nigerian film industry. It concludes, amongst others, that Nigerian film industry should evolve an indigenous film language through a fusion of traditional story telling forms and conventional film codes. Key words: Film; Indigenization; Yoruba video film; Aesthetics Resumé: La bourse du Home vidéo est un aspect émergent des études théatrales au Nigéria. Les études précédentes ont été simplement des critiques de l'incapacité des praticiens du cinéma nigérian d’élaborer une forme indigène, et elles ont échoué dans la prescription des stratégies nécessaires pour atteindre cet objectif. Cette étude, par contre, comble cette lacune en proposant des dispositifs pour une évolution de métalangage indigène pour l'industrie cinématographique nigérienne. Il conclut, entre autres, que l'industrie cinématographique nigérienne devrait trouver un langage cinématographique autochtone via une fusion entre les formes de récit d'histoire traditionnellse et des codes cinématographiques conventionnels. Mots-clés: Film; Indigénisation; Film Vidéo En Yoruba; Esthétiques
Numerical Simulation of the Mass Flow of Leachate in a Municipal Solid Waste Fill (Part 3) - Leaked Vertical Flow Systems
Olayiwola Oni
Research Journal of Applied Sciences, Engineering and Technology , 2010,
Abstract: This study reports the simulation technique and the visualisation of the temporal vertical mass flow and leakages in waste layers and gravel bed of a municipal solid waste fill. Visual comparison of the cumulative mass leakage with optimal leachate mass flow in each waste layer enables the negative consequence of seepage of any highly toxic leachate to be mentally comprehended. The impact of the mass leakage appears to be influenced not necessarily by the location of the seepage pore but by its volume, and also distance from the source of the solute contamination. The simulation results necessitate the need for an effective leachate monitoring system within and in the vicinity of a waste landfill. The findings will be of utmost usefulness to the stakeholders of solid waste landfill in both developed and developing countries.
Ground Investigation into the Hydro-Geotechnical Characteristics of a Municipal Waste Fill Using Static Cone Penetration Tests
Olayiwola Oni
Research Journal of Applied Sciences, Engineering and Technology , 2010,
Abstract: This study describes the procedure used to undertake Cone Penetration Tests (CPTs) on the municipal solid w aste landfill at W hite’s pit, Wimborne, UK. The results of the CPTs were interpreted and analysed in the context of the usefulness of the tests for determining the geo-environmental properties of the emplaced waste. The general hydro-physical characteristics of the emplaced w aste are comparable to sand/silt mixtures, with no dynamic pore pressure. Although CPTs may not be appropriate for determining accurate quantification of the hydro-physical properties of an emplaced waste, it may be suitable for a general characterisation of the waste fill in relations to the soil type behaviour, especially at old sites with no historical data of the type of materials that were emplaced. This finding will significantly enhance the decisions of geoenvironmental engineers in field investigations concerning waste fills.
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