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Search Results: 1 - 10 of 45127 matches for " Michael Adekunle Olatunji "
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Evaluation of NORM and Dose Assessment in an Aluminium Industry in Nigeria  [PDF]
Janet Ayobami Ademola, Michael Adekunle Olatunji
World Journal of Nuclear Science and Technology (WJNST) , 2013, DOI: 10.4236/wjnst.2013.34025

The activity concentrations of natural radionuclides 226Ra, 232Th and 40K in bauxite ore, alumina, dross tailing, aluminium scraps and soil samples collected from an aluminium industry in Nigeria were determined by gamma ray spectroscopy method. The mean values of 226Ra, 232Th and 40K content of the samples ranged from 16 ± 6 (alumina) to 31 ± 10 (scrap), 41 ± 0.12 (scrap) to 134 ± 21(bauxite) and 47 ± 14 (bauxite) to 354 ± 8 (scrap) Bq·kg-1, respectively. The mean activity concentrations of 226Ra and 40K in all the samples are lower than the world average for soil while 232Th is higher with the exception of alumina and scrap. As a measure of radiation hazard to the occupational workers and the members of the public, the radium equivalent activities and external gamma dose rates due to the radionuclides at 1 m above ground surface were calculated. The radium equivalent activities which varied between 88 ± 10 (alumina) and 222 ± 34 (bauxite) Bq·kg-1 are within the safety recommended limit of 370 Bq·kg-1. The mean annual effective doses calculated from the absorbed dose

The Effect of Highly Active Antiretroviral Therapy on CD4 Counts and Body Weight in HIV/AIDS Patients in South West Nigeria
Olatunji Mabayoje,Musa Muhibi,Adekunle Mustapha,Olufemi Fadiora,Taiwo Adewole
Research Journal of Medical Sciences , 2012, DOI: 10.3923/rjmsci.2012.228.231
Abstract: Prior to the advent of HAART the diagnosis of HIV/AIDS was a death sentence. Research has shown that this is no more the case. This retrospective study was aimed at determining the effect of HAART on CD4 counts and body weight of HIV-positive subjects. The CD4 counts and body weight of HIV-positive patients were accessed from the records of HIV clinic of LAUTECH Teaching Hospital, Oshogbo. The data comprised of records of the CD4 counts and body weight of fifty HIV-positive patients not on HAART treatment and that of fifty HIV-positive patients on HAART treatment for a period of 1 year. Results showed a significant difference between mean CD4 counts of control subjects and test subjects (p<0.05). This significant difference represents an increase in CD4 count of HIV patients on HAART. This study also shows no significant difference between mean body weight of control subjects and test subjects (p>0.05). This study highlights the need for importance of regular monitoring of the CD4 count and body weight in HIV patients in order to determine when to start treatment with HAART therapy to prevent the invasion of life threatening opportunistic infections.
Design of Steam Turbine for Electric Power Production Using Heat Energy from Palm Kernel Shell  [PDF]
Buliaminu Kareem, Theophilus Ewetumo, Michael K. Adeyeri, Akinlabi Oyetunji, O. E. Olatunji
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.611009
Abstract: The steam turbine is a prime mover that converts kinetic energy in steam into rotational mechanical energy through the impact or reaction of the steam against the blades. The aim of this study is to design a steam turbine for a small scale steam power plant with target of producing electricity. The turbine is driven by the heat energy from palm kernel shells as a renewable energy source obtained at a lower or no cost. The study was concentrated on design of turbine elements and its validation using computer packages. Specifically, the microturbine design was limited to design, modeling, simulation and analysis of the rotor, blades and nozzle under the palm kernel shell as fuel for the micro power plant. In blade design, stress failures, efficiency and blade angle parameters were considered. In casing volume design, the overall heat transfer and mean temperature, and different concepts were applied. The thermal distribution on stator and rotor was considered in order to determine its level of tolerance. The design software packages used for design validation were Solidworks and Comsol Multiphysics for analysis. Simulation results showed that the designed steam turbine can adequately tolerate change in stress/load, torsion/compression, temperature and speeds.
Optimal Distribution of N-Team Interacting Decision Makers with Hierarchical Command Inputs That Are Predicated on Order Statistics  [PDF]
Michael Olatunji Oladejo, Uchenwa Linus Okafor, Darius Tienhua Chinyio, Celestine Ozoemena Uwa
Open Journal of Optimization (OJOp) , 2019, DOI: 10.4236/ojop.2019.81001
Abstract: The spectral analysis of simulated N-team of interacting decision makers with bounded rationality constraints of Oladejo, which assumes triangular probability density function of command inputs is hereby restructured and analysed, to have hierarchical command inputs that are predicated on order statistics distributions. The results give optimal distributions.
Journal of Engineering Science and Technology , 2010,
Abstract: A detailed computational procedure for evaluating lactose hydrolysis with immobilized enzyme in a packed bed tubular reactor under dispersion flow conditions is presented. The dispersion flow model for lactose hydrolysis using different kinetics, taking cognizance of external mass transfer resistances, was solved by the method of orthogonal collocation. The reliability of model simulations was tested using experimental data from a laboratory packed bed column, where the -galactosidase of Kluyveromyces fragilis was immobilized on spherical chitosan beads. Comparison of the simulated results with experimental exit conversion shows that the dispersion flow model and using Michaelis-Menten kinetics with competitive product (galactose) inhibition are appropriate to interpret the experimental results and simulate the process of lactose hydrolysis in a fixed bed.
Retropharyngeal emphysema: An unusual aetiology—A case report and literature review  [PDF]
Daniel Adekunle, Onakoya Paul Adekunle
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.23053

Introduction: Retropharyngeal emphysema is a potentially life threatening condition which may require urgent diagnosis and intervention. It has been documented to occur following trauma to the aerodigestive tract and is usually accompanied by subcutaneous emphysema of the cervical region. This condition may be complicated by mediastinal emphysema and pneumomediastinum. Foreign body ingestion is quite common in little children and in this environment; a cultural practice is for mothers or other caregivers to attempt to remove these foreign bodies by forcing their finger(s) down the oropharynx and Hypopharynx of these young children. This usually results in injuries to these anatomical sites. Retropharyngeal emphysema complicating this practice is rarely reported. Case presentation: We present the case of a 4-year-old Nigerian boy who presented with stridor and severe dyspnoea following repeated attempts at removal of a purportedly ingested foreign body by his mother. Examination revealed oedema of the soft palate with small multiple bleeding shallow lacerations of the oropharyngeal walls. Oxygen therapy was commenced and preparations for urgent upper airway intervention made. Soft tissue neck X-ray revealed retropharyngeal and subcutaneous emphysema with upper airway compromise. Conservative treatment with high dose steroids and antibiotics led to a gradual resolution of the condition. Conclusion: This is a rarely reported complication of this relatively common socio-cultural “foreign body removal method”. Public awareness is required to stop this potentially life threatening practice.

Water ingestion affects orthostatic challenge-induced blood pressure and heart rate responses in young healthy subjects: gender implications
LA Olatunji, AO Aaron, OS Michael, IP Oyeyipo
Nigerian Journal of Physiological Sciences , 2011,
Abstract: Evidence exists that women have lower orthostatic tolerance than men during quiescent standing. Water ingestion has been demonstrated to improve orthostatic tolerance in patients with severe autonomic dysfunction. We therefore sought to test the hypothesis that water ingestion would improve orthostatic tolerance in healthy young women more than in aged-matched men. Thirty seven (22 men and 15 women) healthy subjects aged 22.5± 1.7 and 21.5±1.4 (means±SD) respectively, ingested 50ml (control) and 500ml of water 40min before orthostatic challenge on two separate days of appointment in a randomized controlled, cross-over design. Seated and standing blood pressure and heart rate were determined. Orthostatic tolerance was assessed as the time to presyncope during standing. Ingesting 500ml of water significantly improves orthostatic tolerance by 22% (32.0 ± 5.2 vs 26.2 ± 2.4min; p< 0.05) in men and by 33% (24.2±2.8 vs 18.3 ± 3.2; p< 0.05) in women. Thirty minutes after ingesting 500ml of water, seated systolic blood pressure, diastolic blood pressure, pulse pressure and mean arterial pressure rose significantly in men while only systolic blood pressure and pulse pressure rose significantly in women. However ingesting 500ml of water did not have significant effect on seated heart rate in both men and women. Ingestion of 500ml of water significantly attenuated both the orthostatic challenge-induced increased heart rate and decreased pulse pressure responses especially in women. Diastolic blood pressure tended to be positively correlated with orthostatic tolerance strongly in men than in women. Pulse pressure correlated positively while heart rate correlated negatively to orthostatic tolerance in women but not in men independent of other correlates. Water ingestion is associated with orthostatic tolerance strongly in women but weakly in men independent of other correlates. In conclusion, the findings in the present study demonstrated that water ingestion caused improvement strongly in young women than in young men. This improvement is associated with increased pulse pressure and decreased tachycardiac responses during orthostatic challenge.
Modelling the Dynamics of Government Finance on Bond Market Return in Nigeria  [PDF]
Olatunji Abdul Shobande
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.815210
Abstract: This study proposes a theoretical modeling approach for analyzing the impact of government finance on bond market return in Nigeria. The overall result shows that government finance affects not only the rate of return on asset issued by government but also the rate of return on private securities.
Abolition of Commercial Motorbikes and Its Implication on Transportation and Criminality in Calabar Metropolis
Christopher Eraye Michael,Usman Adekunle Ojedoku,Eke Chijioke Chinwokwu
International Journal of Social Science Studies , 2013, DOI: 10.11114/ijsss.v1i1.103
Abstract: The study examined the abolition of commercial motorbikes and its implications on transportation and criminality in Calabar Metropolis. The main objective of the study was to assess the implications associated with the abolition of commercial motorbikes as a means of transport and its effect on criminality in Calabar Metropolis. To achieve this objective, the study elicited data through questionnaire from 984 randomly selected respondents. Simple percentages and chi-square were employed to analyze elicited data at 0.05 levels of significance. The findings revealed that factors such as upsurge in criminal activities, rise in traffic accidents, traffic congestion and recklessness on the part of the operators of commercial motorbikes among others account for the abolition of motorbikes as a means of transportation in Calabar Metropolis. The study findings also revealed that the abolition of commercial motorbikes resulted in the delay of workers getting vehicles to their workplaces, increased in transportation fare charges and quarrel amongst commuters as they struggle to access few available transport vehicles. Furthermore, the study findings revealed that the abolition has resulted to an increase in criminal activities such as armed robbery, pick-pocketing, theft and snatching of valuables. The study recommends among others: the provision of alternative jobs for the displaced youths who have been affected by the government action, government should partner with private sectors to establish avoidable transport system for the masses and government should ensure that urban taxi cabs maintained approved standard transport fares in all routes to avoid arbitrary and unavoidable charges.
An Assessment of Ionospheric Error Mitigation Techniques for GNSS Estimation in the Low Equatorial African Region  [PDF]
Isioye Olalekan Adekunle
Positioning (POS) , 2014, DOI: 10.4236/pos.2014.51004

Single frequency GNSS receivers are the most widely used tools for tracking, navigation and geo-referencing around the world. It is estimated that over 75% of all GNSS receivers used globally are single frequency receivers and users experience positioning error due to the ionosphere. To enable GNSS Single Frequency Precise Point Positioning (SFPPP), accurate a-prior information about the ionosphere is needed. The variation of the ionosphere is larger around the magnetic equator and therefore depends on latitude. It will be expected that SFPPP works better on latitude further from the magnetic equator. This present study aims to investigate the accuracy of some ionospheric error mitigation approaches used in single frequency precise point positioning (SFPPP) at several GNSS station in the new Nigerian GNSS Network (NIGNet) and two IGS sites in the low equatorial African region. This study covers two epochs of observation. The first consists of observation from three consecutive days (GPS week 1638; days 0, 1 and 2) that belongs to a period of low solar activities. The second epoch consists of observation from three consecutive days (GPS week 1647; days 2, 3 and 4) that belongs to a high solar activity and intense geomagnetic conditions. The estimated position for the GNSS stations from dual frequency measurement and their known ITRF solutions were used as a benchmark to assess the accuracy of SFPPP under four conditions i.e., SFPPP without ionospheric correction, SFPPP using final GIM models from the Centre for Orbit Determination in Europe( CODE), SFPPP with Klobuchar model, and SFPPP with a computed (local) model at each station. All computation was done using Leica Geo-office software. The result of the study clearly demonstrates the significance of removing or correcting for the effect of the ionosphere, which can result in up to 7 m displacement.

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