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Search Results: 1 - 10 of 45180 matches for " Adeyemi Michael Bolaji "
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Performance Assessment of Selected Nigerian Vegetable Oils as Quenching Media in Hardening Process for Medium Carbon Steel  [PDF]
Joseph Babalola Agboola, Oladiran Abubakre Kamardeen, Edeki Mudiare, Michael Bolaji Adeyemi, Samuel Ayo Afolabi
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.32011
Abstract: A comparative study was carried out to investigate the suitability of some selected Nigerian vegetable oils as alternative quenchant to SAE40 engine oil for industrial heat treatment of Medium Carbon steels. The study involved the characterization of physicochemical properties and fatty acid profile of cotton seed oil, palm kernel oil, neem seed oil and palm oil. The quenching performance of these vegetable oils was conducted at quenchant bath temperatures of 34oC, 50oC, 70oC, and 100oC. SAE40 engine oil (Standard quenchant) and tap water served as control. The effect of cooling rates of the quenching media on mechanical properties and microstructure of the quenched steel samples were investigated. The results obtained show that the different vegetable oils have different viscosity and viscosity-temperature behavior just as their molecular structures were different. The mechanical properties of the as-quenched specimens in these oils show that the hardness of steel quenched in palm kernel oil was highest 40.85HRC. As received sample absorbed the highest amount of energy (183 J) before fracture while sample quenched in water absorbs least energy (28 J). Hence vegetable oil is suitable as alternative quenchant to petroleum based SAE40 engine oil for quenching medium carbon steels, without cracking or distortion, the most suitable among them being palm kernel oil.
Effect of Velocity of Impact on Mechanical Properties and Microstructure of Medium Carbon Steel during Quenching Operations  [PDF]
Joseph Babalola Agboola, Oladiran Abubakre Kamardeen, Edeki Mudiare, Michael Bolaji Adeyemi
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.77039
Abstract: Theoretical analysis of the effects of velocity of impact using suitable heat transfer equations expressed in forms of finite difference method was developed and used to determine their effects on the characteristic cooling parameters during quenching process. Various velocities of impact obtained by varying the heights of specimen drops were also used to experimentally determine their effects on characteristic cooling parameters and mechanical properties of medium carbon steel using water as the quenching medium. At height of drop of 0.5 m, 1.0 m, 1.5 m, and 2.0 m, the tensile strength of the material is 410.4, 496.12, 530.56, and 560.40 N/mm2 respectively. The corresponding hardness values are 42.4, 45.2, 46.2, 50.5 HRC respectively. It is found that as the velocity of impact increases, maximum cooling rate increases. Hardness and ultimate tensile strength also increase. There are good agreements between theoretical and experimentally determined values of critical cooling parameters of water during quenching operations.
Determining the Effect of Cutting Fluids on Surface Roughness in Turning AISI 1330 Alloy Steel Using Taguchi Method  [PDF]
Onyemachi Joachim Onuoha, James Oseni Abu, Sunday Albert Lawal, Edeki Mudiare, Michael Bolaji Adeyemi
Modern Mechanical Engineering (MME) , 2016, DOI: 10.4236/mme.2016.62006
Abstract: Taguchi method has been employed to investigate the effects of cutting fluids on surface roughness in turning AISI 1330 alloy steel, using manually operated lathe machine. Experiments have been conducted using L27 (34) orthogonal array and each experiment was repeated three times and each test used a new cutting tool, High Speed Steel (HSS), to ensure accurate readings of the surface roughness. The statistical methods of Signal-to-Noise (S/N) ratio and the Analysis of Variance (ANOVA) were applied to investigate effects of cutting speed, feed rate and depth of cut on surface roughness under different cutting fluids. Minitab 14 software was used to analyze the effect of variables on the surface roughness. Results obtained indicated that optimal variables for the minimum surface roughness were cutting speed of 35 m/min (level 2), feed of 0.124 mm/rev (level 1), depth of cut of 0.3 mm (level 1) and a cutting fluid with a viscosity of 2.898 mm2/s (level 3). Hence, the optimal parameters to obtain better surface roughness of the workpiece material were obtained when groundnut oil based cutting fluid was used. Analysis of variance shows that feed rate has the most significant effect on surface roughness.
Computer Aided Design of Couplings
Adeyeri Michael Kanisuru, Adeyemi Michael Bolaji , Ajayi Olumuyiwa Bamidele, Abadariki Samson Olaniran
International Journal of Engineering , 2011,
Abstract: The research work explores computer-aided approach to the design of ten different couplings, viza viz: flange, solid rigid, hollow rigid, old ham/ cross-sliding, pin type flexible, sleeve, seller cone/compression, split muff, pulley flange and fairbian’s lap-box couplings. The approach utilizesstandard design equations of these couplings and link them together in computer software todetermine the design parameters of the couplings. The work reviews the procedural stepsinvolved in the design of couplings and the development of the software package using java as atool for the design and dratfting of couplings. The design software named COUPLINGCADcombines with sketch template of a single process so as to generate the required parameters ofthe couplings. The COUPLINGCAD was tested with a number of case studies and the resultsobtained therein were quite satisfactory.
Effect of heat treatment on some mechanical properties of 7075 aluminium alloy
Isadare, Adeyemi Dayo;Aremo, Bolaji;Adeoye, Mosobalaje Oyebamiji;Olawale, Oluyemi John;Shittu, Moshood Dehinde;
Materials Research , 2013, DOI: 10.1590/S1516-14392012005000167
Abstract: this paper reports the effects of annealing and age hardening heat treatments on the microstructural morphology and mechanical properties of 7075 al alloy. the material was cast in the form of round cylindrical rods inside green sand mould from where some samples were rapidly cooled by early knockout and others gradually cooled to room temperature. from the samples that were gradually cooled some were annealed while others were age hardened. both the as-cast in each category and heat treated samples were subjected to some mechanical tests and the morphology of the resulting microstructures were characterised by optical microscopy. from the results obtained there is formation of microsegregations of mgzn2 during gradual solidification which was not present during rapid cooling. it was also found out that age hardening and annealing heat treatment operation eliminated these microsegregations and improve mechanical properties of 7075 al alloy. it is concluded that microsegregation can be eliminated by rapid solidification and appropriate heat treatment process.
Assessing the impact of sea-level rise on a vulnerable coastal community in Accra, Ghana
Kwasi Appeaning Addo,Michael Adeyemi
Jàmbá : Journal of Disaster Risk Studies , 2013, DOI: 10.4102/jamba.v5i1.60
Abstract: Climate change and its associated sea-level rise are expected to significantly affect vulnerable coastal communities. Although the extent of the impact will be localised, its assessment will adopt a monitoring approach that applies globally. The topography of the beach, the type of geological material and the level of human intervention will determine the extent of the area to be flooded and the rate at which the shoreline will move inland. Gleefe, a coastal community in Ghana, has experienced frequent flooding in recent times due to the increasing occurrence of storm surge and sea-level rise. This study used available geospatial data and field measurements to determine how the beach topography has contributed to the incidence of flooding at Gleefe. The topography is generally low-lying. Sections of the beach have elevations of around 1 m, which allows seawater to move inland during very high tide. Accelerated sea-level rise as predicted by the Intergovernmental Panel on Climate Change (IPCC) will destroy homes of the inhabitants and inundate the Densu wetlands behind the beach. Destruction of infrastructure will render the inhabitants homeless, whilst flooding of the wetlands will destroy the habitats of migratory birds and some endangered wildlife species such as marine turtle. Effective adaptation measures should be adopted to protect this very important coastal environment, the ecology of the wetlands and the livelihoods of the community dwellers.
A Study of Teachers’ Perception of Schools' Organizational Health in Osun State
Michael Adeniyi Omoyemiju,Alaba Adeyemi Adediwura
World Journal of Education , 2011, DOI: 10.5430/wje.v1n1p165
Abstract: This study examined the teachers’ perceptions of school organizational health (i.e. resource support, job satisfaction among staff, morale boosts, institutional integrity and initiating structure). Descriptive survey design was used for the study. The sample was composed of 330 secondary school teachers randomly selected from 283, 826 secondary school teachers in Osun State. Data collected was subjected to t-test analysis. It was found that that there is higher homogeneity within the group of male and female secondary school teachers and public secondary school teachers have a higher perception than their private counterpart. In conclusion, governments at various levels who are the proprietor of public schools have the best of teacher who are committed to having good organizational health in the schools. Thus, with little motivation and encouragement this commitment to good organizational health could be transformed into commitment to work and thus, leading to better academic performance of students in the public schools.
Exergetic Analysis of Solar Energy drying Systems  [PDF]
B.O. Bolaji
Natural Resources (NR) , 2011, DOI: 10.4236/nr.2011.22012
Abstract: An exergetic analysis of three basic types of solar drying systems is presented. The analysis is used to find the available useful energy and the quality of energy that is obtainable from the dryers. The dryers were installed side by side and tested simultaneously to eliminate influence of solar radiation and environmental changes in comparing their performances. The results obtained show that mixed mode and indirect mode solar dryers are more effective in utilizing the captured energy than direct mode dryer, and mixed mode has a slight edge in superiority over indirect mode system. 78.1% and 77% of energy collected in the mixed mode and indirect mode systems, respectively, were available as useful energy, while direct mode system could only convert 49.3% of collected energy to useful energy. The overall exergetic efficiencies of mixed mode, indirect mode and direct mode systems were found to be 55.2%, 54.5% and 33.4%, respectively.
The Climate Change Challenge in Africa:- Impacts, Mitigation and Adaptation
International Journal of Asian Social Science , 2012,
Abstract: Climate change is now a reality, and is already having devastating effects on the natural environment and human populations across the world. Many studies (Maathai, 2006; UNFCC 2006; CCDI 2007; IPCC 2007 and UNDP 2009) have confirmed that Africa contributes the least to global warming but the region is the most vulnerable and most adversely affected by climate change. Unpredictable rains and floods, prolonged droughts, subsequent crop failures and rapid desertification among others have in fact already begun to change the face of the continent. Africa’s poor and vulnerable will be particularly hit by the effects of the rising temperatures. This paper examines the problem of climate change in Africa; its impacts, mitigation and adaptation measures are equally investigated. The paper explains that neither mitigation nor adaptation alone can avoid significant impacts but together they can compliment each other and reduce significantly the risks of climate change. Finally it concludes with recommendation to African Countries to enable them reduce vulnerability and increase capacity to adapt while suggesting the need to integrate climate change concerns into all planning whether it be infrastructure, education or health.
The Moral Value of Yorùbá Moonlight Tales  [PDF]
Timothy Adeyemi Akanbi
Open Journal of Modern Linguistics (OJML) , 2014, DOI: 10.4236/ojml.2014.44040
Abstract: Considerable attention has been given to oral literature in Yorùbá language. Oral literature, as regards children lullaby, children rhymes and moonlight tales are not left out. However, most of the earlier writings on folktales are centred only on the compilation of these oral literatures. However, Isola (1995) and Akinyemi (2004) have made some attempts in explaining the educational significance of these oral literatures. While Isola (1995) looks at children lullaby and children rhymes in relation to the intellectual and social development of the African child, Akinyemi’s focus is on oral literature as it relates to the indigenous education for children. Our focus in this paper is on the moral value of this oral literature to both the youth and the adult. We also opine that moonlight tales, because of their moral values, should be included in the curriculum of both the primary and secondary schools. This paper, which is a deviation from the moonlight stories mentioned in Akinyemi (2004), does not look at the pranks of the tortoise but human beings. Lessons, which the stories pass across, are highlighted.
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