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

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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Potential use of Clerodendrum capitatum extracts and its formulation for control of three major stored product beetles

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Food Quality and Safety 2019年第3期3卷 179-185页

作者： Jacobs Mobolade adesina Anjanappa Raghavendra Yallappa Rajashekar Thomas Inomisan Ofuya Department of Crop Soil and Pest Management TechnologyRufus Giwa PolytechnicOwoNigeria Insect Resources Laboratory Animal Resources ProgrammeInstitute of Bioresources and Sustainable DevelopmentDepartment of BiotechnologyGovernment of IndiaImphal Division of Insect Ecology National Bureau of Agricultural Insect ResourcesBangaloreIndia Department of Crop Soil and Pest ManagementFederal University of TechnologyAkureNigeria

Objective:Insecticidal activity of Clerodendrum capitatum extracts against the stored product insect pest,Sitophilus oryzae(L.),Rhyzopertha dominica(F.),and Tribolium castaneum(Herbst)were *** and Methods:Hundred grams of *** powder was sequentially extracted with a series of solvents of increasing polarity in a Soxhlet apparatus and the extracts were concentrated on rotary evaporator to make it solvent free and the residue dissolved in a known volume of methanol and the solution was assayed for insecticidal activity by the fumigant *** extract which showed maximum activity was selected for the preparation of herbal formulation and for its insecticidal properties and *** herbal formulation obtained from leaves of *** was investigated by GCMS and GC/***:Clerodendrum capitatum ethyl extract had a very strong repellent activity to adults of all three major stored grain insects and was significantly repellent at a 1.58 mg/cm^(2).The hexane extract(oil)had high fumigant activity with LC_(50) values in the range between 25 and 32μg/L.A total of 14 components representing 97.8%of the formulation were identified and the main compounds in the formulation were found to be 2-Heptanone,3-methyl(33.9%)and Hexahydrofarnesyl acetone(25.3%)followed by 3-Dodecen-1-al(10.2%)and 8-Methyl-1-undecene(4.9%).Further,herbal formulation was found to be highly toxic to mixed age cultures of all three major stored grain insect pests which recorded 80%-90%mortality at dose of 200μg/L in 24 h exposure,where as 100%mortality achieved at dose of 200μg/L in 72 h exposure,***:The results indicate that extracts and formulation of *** has the potential to be developed in to a natural insecticide or repellent for controlling of stored product beetles.

关键词： fumigation gas chromatography mass spectrometry(GCMS) herbal formulation repellence stored product beetles

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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) 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

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Study the suitability of neem seed oil for formulation of eco-friendly oil based drilling fluid

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Petroleum Research 2021年第3期6卷 283-290页

作者： adesina Fadairo Gbadegesin Adeyemi Temitope Ogunkunle Kegang Ling Vamegh Rasouli Elijah Effiong James Ayoo Department of Petroleum Engineering University of North DakotaUSA Department of Petroleum Engineering Covenant UniversityNigeria Chevron Nigeria Limited Nigeria

The present work intended to develop an invert emulsion drilling mud from biodegradable neem seed oil as an alternative to conventional diesel-based drilling *** would present comparable properties and performances with API standard requirements,ecologically friendly and at a low *** produced from non-edible neem oil was used as the continuous phase in an invert emulsion-based drilling *** tests to investigate the applicability of the mud for drilling applications were *** rheological and lubricity tests results indicate that the neem oil biodiesel-based drilling muds are comparable with conventional diesel-based drilling *** produced biodiesel shows a significantly better flash point of 168℃ than the traditional diesel flash point of 70℃;indicating better fire safety than the conventional *** lubricity and rheological data indicate the formulated mud with neem seed oil biodiesel fair reasonably well with conventional diesel and within the API re*** general,the preliminary results show that neem oil biodiesel is a potential alternative to conventional organic oil in formulating oil-based drilling mud in terms of technical and environmental analysis.

关键词： Drilling mud Invert emulsion Biodiesel Neem seed oil

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An Improved Text-Based and Image-Based CAPTCHA Based on Solving and Response Time

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Computers, Materials & Continua 2023年第2期74卷 2661-2675页

作者： Ademola Olusola.adesina Patrick Seun Ayobioloja Ibidun Christiana Obagbuwa Tola John Odule Adenrele AAfolorunso Sunday Adeola Ajagbe Department of Mathematical Sciences Olabisi Onabanjo University Ago-Iwoye120107Nigeria National Open University of Nigeria Abuja900001Nigeria Sol Plaatje University KimberleyNorthern Cape8305South Africa Computer Engineering Department Ladoke Akintola University of TechnologyLAUTECHOgbomoso210214Nigeria

CAPTCHA is an acronym that stands for Completely Automated Public Turing Test to tell Computers and Humans Apart(CAPTCHA),it is a good example of an authentication system that can be used to determine the true identity of any *** serves as a security measure to prevent an attack caused by web bots(automatic programs)during an online *** can come as text-based or image-based depending on the project and the *** usability and robustness,as well as level of security,provided each of the varies and call for the development of an improved ***,this paper studied and improved two different CAPTCHA systems(the text-based CAPTCHA and image-based CAPTCHA).The textbased and image-based CAPTCHAwere designed using *** time and solving time are the two metrics used to determine the effectiveness and efficiency of the two CAPTCHA *** inclusion of response time and solving time improved the shortfall of the usability and robustness of the existing *** developed system was tested using 200 students from the Federal College of Animal Health and Production *** results of each of the participants,for the two CAPTCHAs,were extracted from the database and subjected to analysis using *** result shows that textbased CAPTCHAhas the lowest average solving time(21.3333 s)with a 47.8%success rate while image-based CAPTCHA has the highest average solving time was 23.5138 s with a 52.8%success *** average response time for the image-based CAPTCHA was 2.1855 s with a 37.9%success rate lower than the text-based CAPTCHA response time(3.5561 s)with a 62.1%success *** indicates that the text-based CAPTCHA is more effective in terms of usability tests while image-based CAPTCHA is more efficient in terms of system responsiveness and recommended for potential users.

关键词： CAPTCHA computational intelligence information security response time solving time

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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

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Does Soil under Natural <i>Tithonia diversifolia </i>Vegetation Inhibit Seed Germination of Weed Species?

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American Journal of Plant Sciences 2013年第11期4卷 2165-2173页

作者： Gabriel Olulakin adesina Department of Crop and Environmental Protection Faculty of Agricultural Sciences Ladoke Akintola University of Technology Ogbomoso Nigeria

Pot experiment was carried out in the screen house, Ladoke Akintola University Technology Ogbomosho, Nigeria to determine the possible impact of Tithonia diversifolia on the growth of thirteen selected weed species weeds growing in its surroundings. The study consisted of two treatments (Tithonia diversifolia infested and Non-Tithonia diversifolia infested soils) and from the two media, the growth of A. hispidium, B. pilosa E. heterophylla, P. maximum and P. polystachion was significantly affected in soil infested by T. diversifolia. The number of weed seedling emergence afore mentioned was significantly lower than what was obtained in soil not infested with T. diversifolia and this accounted for about 38% of the tested weed species. Germination of four of these weeds species (23%) (A. spinosus, C. viscosa, T. procumbens and D. gayana) was enhanced by the presence of T. diversifolia. The study further revealed that weed counts in T. diversifolia infested soil is significantly lower than the ones in soil without T. diversifolia infestation. Likewise, the vegetative growth of some species (A. spinosus, C. viscosa, T. procumbens and D. gayana) was improved in this soil. This shows that T. diversifolia infested soil contains allelochemicals that performed both stimulatory and inhibitory functions.

关键词： Tithonia diversifolia Allelopathy Allelochemical Asteraceae

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Oil Pollution and Bio-Diversity Conservation in Nigeria: An Assessment of Legal Framework

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Journal of Geoscience and Environment Protection 2019年第8期7卷 354-371页

作者： adesina Temitayo Bello Joseph Amadi Department of Private and Commercial Law School of Law and Security Studies Babcock University Iperu-Remo Ogun State Nigeria

Oil pollution distorts aquatic life which not only destroys the source of livelihood of fishers, but also causes a shortage of supply of seafood. It destroys the fertile soil, which makes it difficult for the farmer to farm as a means of livelihood, and the supply of agricultural produce is reduced as a result of poor crop yields. This article deals with the effects of oil pollution on biological diversity in Nigeria. It espouses the legal regime of oil pollution and biological diversity. The article highlights threatened components of the country’s biological diversity and the measures taken by the government to control and checks the activities of oil companies in a bid to ensure that they abide by best practices for the conservation of the country’s biological diversity. This article recommended that there needs to be a collective effort of the government, Petroleum Companies and host communities to ensure that Nigeria’s Bio-diversities is conserved. The article established that Bio-diversity is the true essence of natural life;however, oil pollution can cause the total destruction of this natural life, hence, the need for the conservation of our bio-diversity, for the protection of the environment and human existence.

关键词： Oil Pollution Biological Diversity Conservation

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Effect of crude oil pollution on heavy metal contents, microbial population in soil, and maize and cowpea growth

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Agricultural Sciences 2014年第1期5卷 43-50页

作者： Gabriel Olulakin adesina Kasali Amofe Adelasoye Department of Crop and Environmental Protection Faculty of Agricultural Sciences Ladoke Akintola University of Technology Ogbomoso Nigeria

The effect of crude oil pollution on heavy metal content in the soil, microbial population, and growth performance of maize and cowpea was investigated. The heavy metals determined were lead, cadmium, iron, nickel, zinc and copper. Microbial population and growth performance of maize and cowpea in both polluted and unpolluted soils samples were evaluated. Results showed that higher concentration of heavy metals was observed in all crops planted in polluted soil, polluted site vegetation and soils. The total heterotrophic bacteria was 89% lower in the polluted soil than in the unpolluted soil while fungi was 78% lower in the polluted soil when compared to the unpolluted soil. However, hydrocarbon utilizing bacteria and fungi was 22% and 24% higher in the polluted soil than in the unpolluted soil respectively. Maize and Cowpea performed poorly in polluted soil when compared with unpolluted soil as evidenced in the growth parameters measured for both crops.

关键词： Pollution Heavy Metals Microbial Population

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Bio-Diesel Based Additive for Enhancing Flow of Emulsion in Pipeline

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Advances in Chemical Engineering and Science 2016年第3期6卷 288-293页

作者： Fadairo adesina Anawe Paul Oladepo David Adeyemi Gbadegesin Covenant University Ota Nigeria

Emulsions are difficult to transport in the oil and gas industry due to its water content and high viscosity property, thus a need arises to break these emulsions down into lighter emulsions that would make it a lot more suitable for transportation. In this research, biodiesel was synthesized and used to break down relatively viscous emulsion samples into lighter emulsion samples. An apparatus was designed with the aim of determining the flowrate of four different samples in different proportions and compositions: 80% oil and 20% water (sample A), 90% sample A + 10% of biodiesel by volume (sample B), 75% of sample A + 25% of biodiesel by volume (sample C), 60% of sample A + 40% biodiesel by volume (sample D). The results showed that it was possible to significantly increase the flow of emulsions by injecting biodiesel, which was acted as a surfactant, resulting in the lowering of the surface tension of the emulsion sample. The relevance of this research work is validated as it proffers a solution to the transportation of heavy oil and emulsions from all over the world possessing the non-Newtonian flow behavior, which results in serious problems related to its transportation.

关键词： Emulsion Biofuel Flow Enhancement Pipeline Additive

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