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Groundwater Evolution, Hydrochemical Facies and Quality Evaluation for Irrigation Use in Akure, Ondo State, Nigeria

Journal of Geoscience and Environment Protection 2019年第8期7卷 118-140页

作者： olumuyiwa olusola falowo Moses Bamidele Amodu Victor Oluwasegunfunmi Adekunle Aliu Moses Philip Otuaga Department of Civil Engineering Technology Rufus Giwa Polytechnic Owo Ondo State Nigeria

Hydrochemical facies, groundwater evolution, and physicochemical reactions between soil or rock and water are of considerable importance when evaluating or predicting the nature of anthropogenic impacts on groundwater quality. In this respect a total of 67 ground water samples were collected randomly in Akure, southwestern, Nigeria from hand pump/dug wells and analyzed for major cations and anions. The domination of cations and anions was in the order of Ca2+ > K+ > Na+ > Mg2+ and ?> Cl- > ?> ?respectively. The pH and Eh of the water samples show an acidic condition, with low salinity hazard (generally less than 250 μS/cm). The Piper classification for hydrogeochemical facies indicates carbonate hardness (secondary alkalinity) exceeds 50% that is by alkaline earths and weak acids, with Ca2+ + Mg2+ + ?water-type. This also suggests a meteoric origin of water quality caused by rock-water interaction. The ratio of ?and Cl- is greater than 1 and implies recharge area or upper water flow course of carbonate rocks (interaction of water with aquifer material). The Na+:Cl- is less than 0.7 signifying loss of Na+ through precipitation of evaporating water;the water is Ca2+ rich and Na+ depleted with Mg2+:Ca2+ less than 0.5 and Na+:K+ less than 15. The Na+:Ca2+ (<1) indicates reverse ionic exchange. The Ca2+:?+ ?for the samples is less than 1.0 suggestive of flow of water through the normal hydrological cycle. The calculated range of values of sodium absorption ratio (1.89 - 26.42), permeability index (42.67 - 170.24), residue sodium carbonate (-1 to 5), magnesium ratio (4 - 53), Kelly ratio (0.04 - 0.84), percent sodium (0.41 - 3.45) suggest good water suitable for irrigation purposes. In addition, the Wilcox plot shows that 98% of the water samples belong to “good to permissible category” for irrigation use.

关键词： Wilcox Diagram Piper Plot Geochemical Signature Groundwater Evolution Salinity Hazard Irrigation Groundwater

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Metal contamination assessment in the urban stream sediments and tributaries of coastal area southwest Nigeria

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Chinese Journal Of Geochemistry 2015年第3期34卷 431-446页

作者： Abiodun M.Odukoya olumuyiwa Akande Department of Geosciences University of Lagos

A geochemical assessment of the fifty surface stream sediments from Ikorodu Southwest Nigeria was carried out to determine the level of contamination. The sediments were dried, disaggregated and sieved to \75 lm fraction for geochemical analysis, using the aqua-regia digestion technique and inductively coupled plasma mass spectrometry. Major elements showed the following trend Fe [ Al [ Ca [ Na [ Mg [ K [ P [ Ti and were below the average shale concentration, except for Na in one *** from factor and correlation analyses showed two groups of trace elements Ni, Co, Mn, U, Th, Sr, V, La, Cr, Ba,Sc, Ga, Cs, Nb, Rb, Y,Ce and Mo, Pb, Zn, As, Cd, Sb, Sn, Zr,which were from geogenic and anthropogenic sources, respectively. The enrichment factor showed that Cd, Bi, Pt, Mo and Ag were, for all samples, within background concentrations, except those of the Ogun River and the Owode Onirin, which showed significant enrichment of Cd, Zn, Cu,Pb and Ag, depletion to minimal enrichment for Bi, Mo and moderate enrichment for Pt. The contamination degree ranged between 1.25 and 143.79. The highest value was found at Owode Onirin and the lowest, at Igbonla 7. The geoaccumulation index showed that all the stream sediments ranged between practically uncontaminated to moderately to highly contaminated—with Pb, Sn, Zn, Cd, Cu, Cr, Zr and Ba. The potential ecological risk factor and environmental risk index(IER) showed that all of the samples were within the class of low to medium contamination risk, except samples from the Owode Onirin, which fell within the class of very high risk to extremely high risk respectively.

关键词：水系沉积物污染评价尼日利亚沿海地区电感耦合等离子体质谱法西南富集因子分析环境地球化学

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Review of economic and environmental benefits of earthen materials for housing in Africa

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Frontiers of Architectural Research 2017年第4期6卷 519-528页

作者： olumuyiwa Bayode Adegun Yomi Michael Daisiowa Adedeji Department of Architecture Federal University of Technology Akure Nigeria School of Architecture and Planning University of the Witwatersrand Johannesburg South Africa

Solutions to housing problems must deal with the issue of building materials - especially advancing those which lower construction cost and costs to the environment. This paper aggregates and reviews empirical evidences to show the advantages and disadvantages of earthen construction materials in terms of cost, energy and thermal properties. We reviewed 136 academic outputs from 17 African countries. Apart from a few studies that differ, literature concurs that earthen construction materials are generally cheaper, cleaner and more thermally comfortable. Notwithstanding the advantages, the level of uptake is presently low. Earthen materials＇ strength and durability are key limitations. We identify possible areas for future research and present specific recommendations that can promote the uptake of earthen materials for housing construction in African cities.

关键词： Housing Building materials Sustainabitity Energy Thermal comfort,Africa

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Physical and mechanical characteristics of composite briquette from coal and pretreated wood fines

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International Journal of Coal Science & Technology 2021年第5期8卷 1088-1098页

作者： Adekunle Adeleke Jamiu Odusote Peter Ikubanni olumuyiwa Lasode Madhurai Malathi Dayanand Pasawan Department of Mechanical Engineering Landmark UniversityOmu-AranNigeria Department of Materials and Metallurgical Engineering University of IlorinIlorinNigeria Department of Mechanical Engineering University of IlorinIlorinNigeria Metal Extraction and Recycling Division National Metallurgical LaboratoryJamshedpurIndia

Melina wood torrefied at 260℃ for 60 min was agglomerated with lean grade coal fines into composite briquettes using pitch as *** biomass(3%-20%)and coal fines(80%-97%)were blended together to produce the composite briquettes under a hydraulic press(28 MPa).The briquettes were cured at 300℃.Density,water resistance,drop to fracture,impact resistance,and cold crushing strength were evaluated for the composite *** proximate,ultimate,and calorific value analyses were carried out according to different ASTM *** studies were carried out using scanning electron microscope and electron probe microanalyzer equipped with energy dispersive *** Transform Infrared Spectrophotometer(FTIR)was used to obtain the functional groups in the raw materials and *** density of the composite briquettes ranged from 0.92 to 1.31 g/cm^(3) after *** with95%).The highest cold crushing strength of 4 MPa was obtained for briquettes produced from 97%coal fines and 3%torrefied *** highest drop to fracture(54 times/2 m)and impact resistance index(1350)were obtained for the sample produced from 97%coal and 3%torrefied *** fixed and elemental carbons of the briquettes showed a mild improvement compared to the raw *** peaks from FTIR spectra for the briquettes shows the presence of aromatic C=C bonds and phenolic OH *** composite briquettes with up to 20%torrefied biomass can all be useful as fuel for various applications.

关键词： Composite briquettes Lean grade coal Torrefied biomass Physico-mechanical properties Combustion properties

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Design and development of an improved traffic light control system using hybrid lighting system

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Journal of Traffic and Transportation Engineering(English Edition) 2017年第1期4卷 88-95页

作者： Michael Osigbemeh Michael Onuu olumuyiwa Asaolu Department of Electronics and Computer Engineering Nnamdi Azikiwe UniversityAwkaNigeria Department of Physics Federal University Ndufu-Alike IkwoEbonyiNigeria Department of Systems Engineering University of LagosLagosNigeria

The deployment of light emitting diodes （LEDs） based traffic system control created the problem of dim displays when ambient light is similar to traffic lights. It causes some drivers＇ disability of seeing and obeying traffic signs. This makes drivers violate traffic rules. In this paper, an attempt to use hybrid lighting technology to mitigate this problem was developed. Incandescent lightings with deployed halogen bulbs provided an instan- taneous source of highly efficacious illumination which is brighter than the drivers＇ ambient lights （both daylight, electrical lights and their reflections）, which can help drivers get access to enough warning and help them initiate traffic safety warning as necessary. The halogen lightings also offered the required high current draw needed in electrical circuitry to help brighten the LED displays. The problem of heat generated was eliminated by aerating the T-junction traffic light control unit designed for this technology. The result of hybrid lighting system design was found to be high luminosity and capability of gaining driver attention in real-time. It also allowed enhanced sign＇s image detection and pro- cessing for smart based technologies by providing the ＂light punch＂ needed for a wide range of visual concems.

关键词： Traffic lights Luminosity Halogen incandescence Light efficacy Energy saving

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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 *** 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 *** 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 *** 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 *** stability criteria which consider accumulation and frictional pressure drops have been *** 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 *** 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 *** developed criteria were computed using MATLAB/Simulink and a severe slugging flow map was ***“new study 1”and“new study 2”showed a 16%and 13%increase respectively in predicted unstable cases than the Malekzadeh *** criteria were tested at different separator *** Taitel and Jansen criteria could not predict severe slugging at elevated separator ***,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 *** cr

关键词： Severeslugging Stability criteria Offshore Pipeline-Riser systems

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3D Seismic Analysis of the Gas Hydrate System and the Fluid Migration Paths in Part of the Niger Delta Basin, Nigeria

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Journal of Ocean University of China 2017年第6期16卷 1027-1034页

作者： AKINSANPE olumuyiwa T. ADEPELUMI Adekunle A. BENJAMIN Uzochukwu K. FALEBITA Dele E. Department of Geology Obafemi Awolowo University Ile-Ife 220282 Nigeria

Comprehensive qualitative and semi-quantitative seismic analysis was carried out on 3-dimensional seismic data acquired in the deepwater compressional and shale diapiric zone of the Niger Delta Basin using an advanced seismic imaging tool. The main aim of this work is to obtain an understanding of the forming mechanism of the gas hydrate system, and the fluid migration paths associated with this part of the basin. The results showed the presence of pockmarks on the seafloor and bottom simulating reflectors(BSRs) in the field, indicating the active fluid flux and existence of gas hydrate system in the area. In the area of approximately 195 km^2 occupying nearly 24% of the entire study field, three major zones with continuous or discontinuous BSRs of 3 to 7 km in length which are in the northeastern, southern and eastern part of the field respectively were delineated. The BSR is interpreted to be the transition between the free gas zone and the gas hydrate zone. The geologic structures including faults(strike-slip and normal faults), chimneys and diapirs were deduced to be the main conduits for gas migration. It is concluded that the biogenic gases generated in the basin were possibly transported via faults and chimneys by advection processes and subsequently accumulated under low temperature and high pressure conditions in the free gas zone below the BSR forming gas hydrate. A plausible explanation for the presence of the ubiquitous pockmarks of different diameters and sizes in the area is the transportation of the excessive gas to the seafloor through these mapped geologic structures.

关键词： pockmark bottom simulating reflector gas hydrate Niger Delta Basin

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Are Tuberculosis Patients Managed According to the National Guidelines in Lagos State Nigeria?

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International Journal of Clinical Medicine 2016年第1期7卷 16-24页

作者： olusola Adedeji Adejumo Olusoji James Daniel Mustapha Gidado Andrew Folarin Otesanya Esther Ngozi Adejumo Ebunoluwa O. Jaiyesimi Oluwatoyin Esther Idowu olumuyiwa O. Odusanya Department of Community Health and Primary Health Care Lagos State University Teaching Hospital Ikeja Lagos Nigeria Department of Community Medicine and Primary Care Olabisi Onabanjo University Teaching Hospital Sagamu Nigeria KNCV Tuberculosis Foundation/TB CARE I Project Abuja Nigeria Medical Services Department Central Bank of Nigeria Lagos Nigeria Department of Medical Laboratory Science Babcock University Ilisan-Remo Nigeria Department of Community Health and Primary Health Care College of Medicine Lagos Lagos State University Lagos Nigeria

Setting: Private and public tuberculosis (TB) treatment centers in Lagos State, Nigeria. Objective: To compare adherence of private and public providers of directly observed treatment short course (DOTS) in the Lagos State TB control program, Nigeria (LSTBLCP) with the national TB guidelines. Design: A retrospective review of treatment cards of TB patients managed within the first and second quarter of 2012 in 34 DOTS facilities {23 public, 7 private for profit (PFP), and 4 private not for profit (PNFP)} involved in the private public mix of the LSTBLCP. Results: Of the 1896 treatment cards reviewed, 1524 (80.4%), 132 (7.0%) and 240 (12.6%) were from public, PFP and PNFP DOTS facilities, respectively. About 19%, 25% and none of the patients managed at the public, PNFP, and PFP DOTS facilities were treated in full adherence with the national guidelines respectively. A significantly higher proportion of adults and sputum smear positive TB patients were treated in full adherence with the national guidelines (p < 0.05). Treatment success was associated with full adherence with the national guidelines. Conclusion: There is a need to reorient health care providers in public and private health facilities in Lagos State Nigeria to ensure full adherence with the national TB guidelines.

关键词： Adherence National Guidelines Health Workers DOTS Facilities

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Hepatocurative potential of Vitex doniana root bark,stem bark and leaves extracts against CCl_4-induced liver damage in rats

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Asian Pacific Journal of Tropical Biomedicine 2014年第6期4卷 480-485页

作者： James Dorcas Bolanle Kadejo Olubukola Adetoro Sallau Abdullahi Balarabe Owolabi olumuyiwa Adeyemi Department of Biochemistry Ahmadu Bello University

Objective:To evaluate the hepatocurative effects of aqueous root bark,stem bark and leaves of Vitex doniana in carbon tetrachloride(CCl_4)induced liver damage and non induced liver damage albino ***:A total of 60 albino rats(36 induced liver damage and 24 non induced liver damage)were assigned into liver damage and non liver damage groups of 6 rats in a *** animals in the CCl_4 induced liver damage groups,were induced by intraperitoneal injection with a single dose of CCl_4(1 mL/kg body weight)as a 1:1(v/v)solution in olive oil and were fasted for 36 h before the subsequent treatment with aqueous root bark,stem bark and leaves extracts of Vitex doniana and vitamin E as standard drug(100 mg/kg body weight per day)for 21 d,while the animals in the non induced groups were only treated with the daily oral administration of these extracts at the same *** administration of CCl_4 was done once a week for a period of 3 ***:There was significant(P<0.05)increase in concentration of all liver marker enzymes,alanine aminotransferase,aspartate aminotransferase and alkaline aminotransferase(ALT,AST and ALP)and significant(P<0.05)decrease in albumin in the CCl_4 induced liver damage control when compared to the normal *** extracts caused a significant(P<0.05)reduction in the serum activities of liver marker enzymes(ALT,AST and ALP)and a significant(P<0.05)increase in albumin of all the induced treated *** stem bark extract and vitamin E significantly(P<0.05)increased total *** the extracts significantly(P<0.05)lowered serum creatinine whereas only root bark extract significantly(P<0.05)lowered serum level of urea in the rats with CCl_4 induced liver ***:Hepatocurative study shows that all the plant parts(root bark,stem bark and leaves)possess significant hepatocurative properties among other therapeutic values justifying their use in folklore medicine.

关键词： Vitex doniana Hepatocurative Liver damage Creatinine Carbon tetrachloride

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Analysis and Dynamics of Fractional Order Mathematical Model of COVID-19in Nigeria Using Atangana-Baleanu Operator

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Computers, Materials & Continua 2021年第2期66卷 1823-1848页

作者： olumuyiwa J.Peter Amjad S.Shaikh Mohammed O.Ibrahim Kottakkaran Sooppy Nisar Dumitru Baleanu Ilyas Khan Adesoye I.Abioye Department of Mathematics University of IlorinIlorinKwaraNigeria Department of Mathematics AKI’s Poona College of ArtsScience and CommerceCampPuneIndia Department of Mathematics College of Arts and SciencesPrince Sattam bin Abdulaziz UniversityWadi AldawaserSaudi Arabia Department of Mathematics Cankaya UniversityAnkara06790Turkey Institute of Space Sciences Magurele-Bucharest077125Romania Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung40447Taiwan Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam

We propose a mathematical model of the coronavirus disease 2019(COVID-19)to investigate the transmission and control mechanism of the disease in the community of *** stability theory of differential equations,the qualitative behavior of model is *** pandemic indicator represented by basic reproductive number R0 is obtained from the largest eigenvalue of the next-generation *** as well as global asymptotic stability conditions for the disease-free and pandemic equilibrium are obtained which determines the conditions to stabilize the exponential spread of the ***,we examined this model by using Atangana–Baleanu fractional derivative operator and existence criteria of solution for the operator is *** consider the data of reported infection cases from April 1,2020,till April 30,2020,and parameterized the *** have used one of the reliable and efficient method known as iterative Laplace transform to obtain numerical *** impacts of various biological parameters on transmission dynamics of COVID-19 is *** results are based on different values of the fractional parameter and serve as a control parameter to identify the significant strategies for the control of the *** the end,the obtained results are demonstrated graphically to justify our theoretical findings.

关键词： Mathematical model COVID-19 Atangana-Baleanu fractional operator existence of solutions stability analysis numerical simulation

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