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Advanced Thermochemical Conversion Approaches for Green Hydrogen Production from Crop Residues

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Journal of Renewable Materials 2024年第1期12卷 1-28页

作者： Omojola Awogbemi Ayotunde Adigun ojo Samson Adedayo Adeleye Department of Mechanical Engineering Ekiti State UniversityAdo EkitiNigeria

The huge volumes of crop residues generated during the production,processing,and consumption of farm products constitute an ecological nuisance when ineffectively *** conversion of crop residues to green hydrogen is one of the sustainable management strategies for ubiquitous crop *** of green hydrogen from crop residue sources will contribute to deepening access to clean and affordable energy,mitigating climate change,and ensuring environmental ***,the deployment of conventional thermochemical technologies for the conversion of crop residues to green hydrogen is costly,requires long residence time,produces low-quality products,and therefore needs to be *** current review examines the conventional,advanced,and integrated thermochemical conversion technologies for crop residues for green hydrogen *** a brief overview of the conventional thermochemical techniques,the review delves into the broad narration of advanced thermochemical technologies including catalytic pyrolysis,microwave pyrolysis,co-pyrolysis,hyropyrolysis,and autothermal *** study advocates the deployment of integrated pyrolysis,anaerobic digestion,pyrolysis,and gasification technologies will ensure scalability,decomposition of recalcitrant feedstocks,and generation of high grade green *** outlook provides suggestions for future research into cost-saving and sustainable integrated technologies for green hydrogen production towards achieving carbon neutrality and a circular bio-economy.

关键词： Crop residues carbon neutrality pyrolysis gasification green hydrogen thermochemical conversion

Friction stir welding of pure magnesium and polypropylene in a lap-joint configuration: Microstructure and mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 766-774页

作者： Amirhossein Moghanian Moslem Paidar Seyyed Salman Seyedafghahi olatunji oladimeji ojo Department of Materials Engineering Imam Khomeini International UniversityQazvin 34149-16818Iran Department of Material Engineering South Tehran BranchIslamic Azad UniversityTehran 14598-53849Iran Department of Engineering Faculty of Materials Science and EngineeringImam Hossein UniversityTehran 15816-18711Iran Department of Industrial and Production Engineering Federal University of Technology AkureAkurePMB 704Nigeria

A hybrid joint with a satisfactory mixture of pure magnesium and polypropylene(PP)was achieved via friction stir joining(FSW)in a lap-joint *** tool rotational and travel speeds used in this work were 500–700 r/min and 50–100 mm/min,*** mechanical properties and microstructural analysis of the resultant hybrid Mg/PP joint were *** results show that the maximum tensile shear strength(22.5 MPa)of the joint was attained at 700 r/min and 75 mm/min due to the optimum percentage fraction of mechanical interlocking(48%)and the presence of magnesium *** interfacial joint center exhibits the maximum microhardness values because of the presence of refined and intertwined Mg fragments and density dislocations in the matrix of the *** joint failed via two different modes:interfacial line and weld zone fractures,respectively.

关键词： welding microstructure pure magnesium polypropylene rotational speed

Use of Geosynthetic Access Mats in Construction

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World Journal of Engineering and Technology 2024年第3期12卷 552-574页

作者： Waseem A. Khatri Abdullah Al Gazlan Nawaf Alubaidi Abiola ojo Waleed Al Safarji Consulting Services Department Saudi Arabian Oil Company Dhahran Kingdom of Saudi Arabia Industrial Projects Department Saudi Arabian Oil Company Dhahran Kingdom of Saudi Arabia

A stable surface to move manpower and equipment is a key for the construction operations. To create a stable road surface, the road construction techniques are time-consuming and expensive for a traditional construction which requires compaction of soil, aggregate base, sub-base and asphaltic layers. A Geosynthetic Access Mat (GAM) system can serve as an alternative to other traditional construction techniques to accommodate temporary construction. Due to its rigidity, the mat system can provide substantial vertical resistance to the applied load under a large deflection subject to soil conditions. This paper provides details of GAM specifications, soil conditions, applications, installation procedure, comparison with other soil stabilization methods and Aramco experience for deployments of these mats.

关键词： Geosynthetic Access Mats (GAM) Bearing Capacity Ground Water Level (GWL) Soil Testing Construction Installation

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Journal of Integrative Nursing 2024年第3期6卷 169-177页

作者： Oluwaseyi Abiodun AKPOR Ishaq Ajibola AFOLAYAN Funmilayo Abimbola IBITOBA Oghenerobor Benjamin AKPOR Olubukola Esther ABIODUN-ojo Department of Nursing Science Afe Babalola UniversityAdo-ekitiEkiti StateNigeria Afe Babalola University Ado-ekitiEkiti StateNigeria

Objective:The study assessed the quality of life(QoL)and coping strategies of patients on hemodialysis in selected hospitals in Ilorin,Kwara ***:The study was a descriptive cross-sectional design using a quantitative strategy.A multistage sampling technique was adopted to select 80 *** data were collected using an adapted questionnaire including four sections:sociodemographic characteristics,hemodialysis stressor scale consisting of four stressors,Jaloweic Coping Scale consisting of eight coping strategies,and QoL consisting of four *** data were analyzed using SPSS version ***:Findings from the study revealed that 50%of the participants were between the ages of 18 and 39 years,40%of the participants have been on hemodialysis for 1-2 years,whereas 52.5%had hypertension as a comorbidity.A total of 12.5%,63.8%,and 23.8%of the respondents were categorized as experiencing low,moderate,and high stress due to hemodialysis,*** of the respondents revealed that 49.4%had no problem in self-care *** monthly income(χ^(2)=16.36,P=0.04)was observed to be significantly associated with coping strategies,whereas religion(χ^(2)=11.14,P=0.03)and frequency of hemodialysis(χ^(2)=10.26,P=0.04)were significantly associated with coping ***:All participants experienced stress at varying *** results in marked changes in the quality of patients’life,since it includes a number of modifications and restrictions,which affects patients’health *** study revealed a wide range of information on the psychological and physiological stressors of people under hemodialysis.

关键词： Chronic renal failure coping strategies health-related quality of life hemodialysis

Effect of functional composite coating developed via sulphate and chloride process parameter on the UNS G10150 steel for structural and wear mitigation in defence application

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Defence Technology（防务技术） 2018年第3期14卷 196-203页

作者： ojo Sunday Isaac Fayomi Department of Mechanical Engineering Covenant University Department of Chemical Metallurgical and Materials Engineering Tshwane University of Technology

The major engineering challenge of materials in defence technologies is the vulnerability of based metals to structural and wears deformation in service. In this paper, structural formation, mechanical and thermal stability behavior of developed composite coating of Zn-30 Al-7%Ti/Sn chloride bath and Zn-30 Al-7%Ti/Sn sulphate bath was investigated and compared to provide mitigation against failure. The thermal ageing property was done for 2 h at 600C via isothermal furnace. The structural, interfacial effect and stability behaviors of the co-deposited alloys were evaluated using scanning electron microscope equipped with energy dispersive spectrometer(SEM/EDS), atomic force microscope(AFM) and Xray diffractometer(XRD). The hardness and wear properties of the deposited coatings were examined with diamond base micro-hardness tester and reciprocating sliding tester respectively. The result shows that Zn-30 Al-7%Ti/Sn sulphate co-deposition contributed to increase hardness and wear resistance than Zn-30 Al-7%Ti/Sn chloride bath alloy. The stable crystal growth and significant performance of Zn-30 Al-7%Ti/Sn sulphate are link to the intermetallic phase hybrid of Zn Al, Zn4 Ti Al2, Zn3 Al Ti. Besides, it was observed that Zn-30 Al-7%Ti/Sn sulphate has excellent thermomechanical stability at harsh temperature,due to the deposition of Sn/Ti on steel; leading to formation of super-hard interface. However, it was established that co-deposition of mild steel with Zn-30 Al-7%Ti/Sn in sulphate bath significantly improved the structural and wear performance. It was shown that the hardness and wear of the developed composite Zn-30 Al-7%Ti/Sn is increased by about 80% compared to as received sample and about 25% compared with Zn-30 Al-7%Ti/Sn chloride coating developed. The improvement was proved to be an interference of zinc-composite growth. Thus, this work shows that sulphate induced Zn-30 Al-7%Ti/Sn via generation of controllable process parameter can provide significant improv

关键词：防卫技术硫酸盐氯化物低碳钢结构涂层合成 UNS

Additive manufacturing of 18%nickel maraging steels:Defect,structure and mechanical properties:A review

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Journal of Materials Science & Technology 2022年第25期120卷 227-252页

作者： Lulu Guo Lina Zhang Joel Andersson Olanrewaju ojo Department of Mechanical Engineering University of ManitobaWinnipeg R3T 5V6Canada Department of Engineering Science University WestTrollh tan 46186Sweden

This paper reviews the latest research progress in the additive manufacturing(AM)process of 18%nickel maraging steels,which involves laser-based powder bed fusion(L-PBF),laser-based directed energy deposition(L-DED),and wire arc additive manufacturing(WAAM).The emphasis is on the defects,structure,and mechanical properties of the additive manufactured 18%nickel maraging *** first,this article outlines the influences of the processing parameters of AM techniques on the defects formed in the fabricated parts,in terms of the L-PBF and *** macrostructure and microstructure characteristics of as-built and heat-treated 18%nickel maraging steel are then described in ***,the mechanical properties of as-built and heat-treated 18%nickel maraging steel are assessed,such as their tensile,hardness,impact toughness,and fatigue ***,future directions for work on the AM of 18%nickel maraging steel are provided.

关键词： Additive manufacturing 18%Nickel maraging steel Defects Macrostructure Microstructure Mechanical properties

In-situ formation characteristic, tribological characterization and anti-corrosion properties of quaternary composites films

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Transactions of Nonferrous Metals Society of China 2014年第10期24卷 3170-3180页

作者： ojo Sunday Isaac FAYOMI Abimbola Patricia Idowu POPOOLA Department of Chemical Metallurgical and Materials EngineeringTshwane University of TechnologyP.M.B. X680 Pretoria South Africa

Improvements of wear and corrosion properties are essential characteristic in engineering application. A study was made on the structure, electro-oxidation and properties of fabricated Zn-Al-SnO 2-Ti O2（Zn-Al-Sn-Ti） thin films using electrodeposition technique from chloride bath. The microstructural studies were performed by scanning electron microscopy with attached energy dispersive spectrometer（SEM-EDS）, optical microscopy（OPM） and X-ray diffractogram（XRD）. The electrochemical oxidation and erosion behavior in 3.65% Na Cl medium were studied by potentiodynamic polarization technique and characterized by atomic force microscopy（AFM）. The hardness and wear behavior of the electrodeposited film were performed by high diamond dura scan microhardness tester and CERT UMT-2 reciprocating sliding machine. It was found that a successful co-deposition of composite and particle were attained. Homogeneous imbedded grain structure distribution and fine refinement of crystal with improved micromechanical behavior was achieved. The corrosion resistance, hardness and wear stability resistance of the fabricated quaternary films improved significantly in all varied process parameter.

关键词： co-deposition microstructural evolution anti-corrosion property composite materials

Anti-Corrosion and Tribo-Mechanical Properties of Co-deposited Zn–SnO_2 Composite Coating

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Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 521-530页

作者： ojo Sunday Isaac Fayomi Abimbola Patricia Idowu Popoola Department of Chemical Metallurgical and Materials EngineeringTshwane University of Technology Department of Mechanical Engineering Covenant University

Zn-SnO2 composite coatings were prepared by direct potential using electrolytic co-deposition technique from sulfate solution. The effect of Zn2＋ and SnO2 concentrations in deposited bath on the mechanical properties and mor- phological characteristics of the composite coatings were examined. The characterizations of the sample were analyzed using scanning electron microscopy couple with energy dispersive spectroscopy （SEM/EDS）, X-ray diffraction （XRD） and atomic force microscopy （AFM）. The electrochemical degradation behavior of the samples in 3.65 wt.% NaCl solution was studied using potentiodynamic polarization technique and characterized by high-resolution optical microscope. From all the fabricated composite coatings, obvious diffraction peaks were observed with Zn-7Sn-S-0.3V film with Zn2Sn7, Sn, Zn2Sn5 and Zn phases, confirming the presence and formation of Zn-SnO2 coating. The XRD pattern shows that the presences of SnO2 particle remarkably play a major role in the precipitation and orientation of the alloy matrix. From the SEM/EDS and AFM results, the deposits show that composite particle and proper bath composition have strong influence on the microstructure. An enhanced corrosion resistance was attained as a result of the induced particles.

关键词： Metal matrix composite Co-deposition Mechanical property Corrosion resistance

Cytotoxicity and effect of extraction methods on the chemical composition of essential oils of Moringa oleifera seeds

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2015年第8期16卷 680-689页

作者： Rowland Monday ojo KAYODE Anthony Jide AFOLAYAN Medicinal Plant and Economic Development Research Centre Department of BotanyUniversity of Fort Hare

Renewed interest in natural materials as food flavors and preservatives has led to the search for suitable essential oils. Moringa oleifera seed essential oil was extracted by solvent-free microwave and hydrodistillation. This study assessed its chemical constituents. Cytotoxicity of the oils was investigated using hatchability and lethality tests on brine shrimps. A total of 16 and 26 compounds were isolated from the hydrodistillation extraction （HDE） and solvent-free microwave extraction （SME） oils, respectively, which accounted for 97.515% and 97.816% of total identifiable constituents, respectively. At 24 h when the most eggs had hatched, values of the SME （56.7%） and HDIE （60.0%） oils were significantly different （P〈0.05） from those of sea water （63.3%） and chloramphenicol （15.0%）. Larva lethality was different significantly （P〈0.05） between HDE and SME oils at different concentrations and incubation periods. The median lethal concentration （LC50） of the oils was 〉 1000 mg/ml recommended as an index for non-toxicity which gives the oil advantage over some antioxidant, antimicrobial, therapeutic, and preservative chemicals.

关键词： Moringa oleifera seed Extraction methods Essential oil Cytotoxicity