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Waste Disposal and Sustainable Energy 2020年第2期2卷 105-111页

作者： Olusola Adedayo adesina adeyinka olumide adesina Jamiu Adetayo Adeniran Department of Chemical and Petroleum Engineering Afe Babalola UniversityAdo-EkitiNigeria Department of Nanoscience Joint School of Nanoscience and Nanoengineering University of North CarolinaGreensboroUSA Climate and Ocean-Atmosphere Studies Laboratory Department of Atmospheric and Oceanic SciencesPeking UniversityBeijingChina Environmental Engineering Research Laboratory Department of Chemical EngineeringUniversity of IlorinIlorinNigeria

Open burning of municipal solid waste(MSW)is a common practice in Nigeria.Emission of compounds of polycyclic aromatic hydrocarbon(PAHs)in ambient air and ash residues from burning of these wastes pose a great danger to the environment.This study investigated the contribution of open burning of MSW to the levels of PAHs in ambient air and ash residues from the burning site.Ash samples were obtained from six sampling locations at a MSW burning site.Polyurethane foam passive samplers were used in collecting ambient air samples.Quantification of PAHs was carried out using GC-MS operated in selected ion monitoring mode.The trend of ambient concentration of PAHs was;ΣPAHs AS-A(4.023)>AS-B(3.798)>AS-D(3.468)>AS-C(3.288),while average concentration of PAHs in the ash was 6.12 mg/kg.Concentrations of PAHs in ash samples ranged from 5.69-6.34 mg/kg.Principal component analysis(PCA)showed that most of the PAHs in the ambient were from MSW combustion.The results obtained suggest that concerted effort of the government and the relevant stakeholders is required to safeguard the environment and humans from PAH pollution from open burning of MSW.

关键词： Pahs Open burning Toxicity equivalent PUF Ash

An improved model for severe slugging stability criteria in offshore pipeline-riser systems

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Petroleum Research 2022年第3期7卷 318-328页

作者： adesina Fadairo Chinemerem Obi Kegang Ling Vamegh Rasouli Olumuyiwa Aboaba olumide Gbadamosi Department of Petroleum Engineering University of North DakotaUnited States Department of Petroleum Engineering University of Texas A&MUnited States Schlumberger Oifield Services Nigeria Repsol NorgeAs Norway

Flow assurance has been a major challenge in petroleum production systems especially in offshore operations where severe slugging is a dominant aching issue.This is characterized by pulsating flow behavior which impacts the reservoir productivity,pipeline-riser systems,and surface facilities(separator).The only means so far,of delivering reservoir fluids from offshore wells to the separator at the surface is by pipeline-riser systems where slugging is most prominent and oftentimes unavoidable.Though passive and active measures have been deployed over time to mitigate the associated problem,there is the need to develop a predictive tool for mitigating offshore slugging in the riser system.This study involves the use of a model and analysis approach to eliminate severe slugging based on the balance of forces acting on the pipeline-riser system.Modified stability criteria which consider accumulation and frictional pressure drops have been developed.The current approach is solely physicsdriven,to predict the corresponding liquid and gas velocities at which the fluctuations would be severe when producing multiphase fluids through pipeline-riser systems.By balancing the forces acting on a riser-pipeline system and accounting for frictional and accumulation effects,two hydraulic flow modeling approaches have been used in this study to improve the criteria for predicting the condition of severe slugging.The developed criteria were computed using MATLAB/Simulink and a severe slugging flow map was generated.The“new study 1”and“new study 2”showed a 16%and 13%increase respectively in predicted unstable cases than the Malekzadeh criteria.The criteria were tested at different separator pressures.The Taitel and Jansen criteria could not predict severe slugging at elevated separator pressure.Notwithstanding,the developed flow maps using the“new study 1”are more reliable than the“new study 2”.This is because the“new study 2”approach over defines the physics of severe slugging.The criteria were also tested at varying accumulation

关键词： Severeslugging Stability criteria Offshore Pipeline-Riser systems

Paleo-productivity and petroleum source evaluation of the Nkporo and Awgu shales, Lower Benue Trough, Nigeria: Insight from inorganic geochemistry

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能源地球科学(英文)

能源地球科学(英文) 2023年第3期4卷 139-148页

作者： Henry Yemagu Madukwe Adebanji Kayode Adegoke Mutiu adesina Adeleye adeyinka Oluyemi Aturamu Department of Geology Faculty of ScienceEkiti State UniversityP.M.B.5363Ado-EkitiNigeria Department of Geology University of Malaya50603Kuala LumpurMalaysia Department of Geology Faculty of ScienceUniversity of IbadanIbadanNigeria

The petroleum paleo-productivity and generative potential of the Nkporo and Awgu shales in the Lower Benue Trough (LBT) were studied. Major oxides were determined using Spectro Ciros Inductively-coupled plasma optical emission spectrometer (ICP-OES) while trace and rare earth elements were determined using an ELAN 9000 Inductively-coupled plasma mass spectrometer (ICP-MS). The shales have Co/Ni ratios greater than 0.1 suggesting oil source rocks with more marine source input due to brief marine incursion in the transition zone after deposition. The very low Ni values and moderate V values, and a lack of correlation between the TOC and sulphur content, suggests that the organic matter is of terrestrial Type Ⅲ;and the very low paleo-productivity (Ba/Al and P/Ti ratios) suggests that the organic matter is of terrestrial origin. The low V/Ni values of the Nkporo and Awgu shales (Av. ≈ 4) and the high metal concentrations indicate a matured status. From the K/Rb ratios of the Nkporo (191–259) and Awgu shales (198–261), it can be deduced that the organic matter within the shales experienced a considerable loss of K and the shales are mature to generate gaseous hydrocarbons.

关键词： Maturity Organic matter Paleo-productivity Petroleum potentials Shale

Unequal aging in Nigeria: evidence on pre-COVID 19

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Aging Communications 2022年第3期4卷 17-23页

作者： Adebayo Makanju Precious Ndukauba Loretta Nwajiaku Ismail Olajide olumide Ogungbemi John adesina Interdisciplinary Social Research Program Trent UniversityOntario K9J-7B8Canada School of Human Kinetics Faculty of Health ScienceUniversity of OttawaOntario K1N-6N5Canada Department of Geography University of LagosLagos 101017Nigeria

Background:The study is focused on assessing predictors of later life inequality in Nigeria with specificity to the gaps in dimension and distribution.Methods:The study employed linear mixed multi-level regression analysis to assess predictors of aged inequalities status nested between geo-political zones and households.The study utilized the general household Survey-Panel(2018-2019)dataset(n=5527 persons aged≤60).Results:Evidence from the cross-sectional study revealed that aging inequalities are prevalent and persist between geo-political zones(γ00=1.374;p<0.001)and among households(γ00=1.266;p≤0.001).Demographic,social,and economic factors were strong determinants of inequality in the country.Conclusion:These results show that inequality among older adults in place and space is prevalent.Furthermore,these dire statistics of unequal inequalities at a later age are a significant problem in Nigeria.Therefore,an in-depth evaluation of the determined risk factors related to unequal aging and actions for its prevention are warranted.

关键词： aging in place inequalities geo-political zones intersectionality Nigeria

A Result on Uniformly Dissipative Solutions for a Certain Fifth Order Non-Linear Differential Equation

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Journal of Mathematical Research and Exposition 2006年第3期26卷 465-470页

作者： adesina Olufemi adeyinka Dept. of Math. Obafemi Awolowo University Ile-Ife Nigeria

Criteria for the existence of uniformly dissipative solutions for a certain fifth order non-linear differential equation are given by means of the frequency domain method.

关键词：有界解消耗解频域不等式非线性微分方程