http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/60 2026-06-17T18:40:19Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/31332 Title: Biomechanical and Physical Properties Selection of Ti-Ha-CaCO3 Biocomposite Prostheses for Replacement of Bone Atrophy Authors: Ibrahim, H. K.; Abolarin, M. S.; Abdulrahman, A. S.; Adedipe, O.; Okoro, U. G. Abstract: Traditional prosthetic materials often lack the desired properties to mimic the mechanical behaviour of natural bone, leading to complications and reduced implant longevity. This study aims to conduct a biomechanical and physical properties selection analysis for biocomposite prostheses' suitable for replacing bone atrophy. This involves evaluating the mechanical properties of developed biocomposites with different structures (dense, porous and gradient) to ensure compatibility with the mechanical properties of bone. The radar chart was adopted to compare and evaluate the mechanical strength of various biocomposite implants and identify the most suitable prosthesis for load-bearing bone replacement. The study utilises powder metallurgy, scanning electron microscopy (SEM), and ImageJ software to produce and characterise the pore size distribution of the biocomposites, respectively. The findings of this study revealed the gradient and porous biocomposites exhibited desired mechanical properties with porosity of 20.67 and 27.72 % pore size up to 134 and 256 μm, compressive strength of 174 and 149.29 MPa and compressive modulus of 30.42 and 28.3 GPa respectively. The SEM analysis, coupled with pore size distribution and porosity percentage measurements, offers valuable information for designing and fabricating biomaterials with enhanced properties. The gradient biocomposite was identified to be the best sample for load-bearing bone replacements by the selection analysis because of its high compressive strength and low modulus, which is within the established cortical bone mechanical properties. 2024-01-01T00:00:00Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/31331 Title: Biomechanical and physical properties selection of Ti-ha-CaCO3 biocomposite prostheses for replacement of bone atrophy Authors: Ibrahim, H. K.; Abolarin, M. S.; Abdulrahman, A. S.; Adedipe, O.; Okoro, U. G. Abstract: Traditional prosthetic materials often lack the desired properties to mimic the mechanical behaviour of natural bone, leading to complications and reduced implant longevity. This study aims to conduct a biomechanical and physical properties selection analysis for biocomposite prostheses' suitable for replacing bone atrophy. This involves evaluating the mechanical properties of developed biocomposites with different structures (dense, porous and gradient) to ensure compatibility with the mechanical properties of bone. The radar chart was adopted to compare and evaluate the mechanical strength of various biocomposite implants and identify the most suitable prosthesis for loadbearing bone replacement. The study utilises powder metallurgy, scanning electron microscopy (SEM), and ImageJ software to produce and characterise the pore size distribution of the biocomposites, respectively. The findings of this study revealed the gradient and porous biocomposites exhibited desired mechanical properties with porosity of 20.67 and 27.72 % pore size up to 134 and 256 μm, compressive strength of 174 and 149.29 MPa and compressive modulus of 30.42 and 28.3 GPa respectively. The SEM analysis, coupled with pore size distribution and porosity percentage measurements, offers valuable information for designing and fabricating biomaterials with enhanced properties. The gradient biocomposite was identified to be the best sample for load-bearing bone replacements by the selection analysis because of its high compressive strength and low modulus, which is within the established cortical bone mechanical properties. 2024-01-01T00:00:00Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/31329 Title: Experimental evaluation of thermal conductivity and thermogravimetric analysis of Jatropha oil-based titanium nano-cutting fluid. Authors: Nwachukwu, V. C.; Lawal, S. A.; Abdulkareem, A. S.; Okoro, U. G. Abstract: Nanoparticles have several potential applications due to their advantageous properties, which have been identified as the main driving force behind nanofluid research. In this study, Jatropha Oil, extracted from the Jatropha plant seeds, was characterized by investigating the physicochemical properties. Jatropha Oil was used as the base fluid for nanofluid formulation by enhancing it with titanium oxide (TiO2) at 0.1%, 0.15%, and 0.2% volume concentrations. The formulated nanofluid was characterized by evaluating the thermal conductivity and degradation profile (thermogravimetric analysis). The findings revealed that the locally sourced Jatropha Oil has 0.916 Specific gravity, 7.85 mg/100g Acid value, 189.33 mgKOH/g saponification value, 2190C flash point, -7 C pour point, 5.09 pH, 113.4 g/100g of KOH iodine value, and 32 mm2/s viscosity at room temperature. It was also found that the nanoparticle cutting fluid enhanced with TiO2 had a better thermal conductivity at 0.15% concentration than the pure base fluid and other enhanced nanofluid modified with 0.1 and 0.2% TiO2 concentration. In addition, the thermogravimetric analysis (TGA) and Differential ThermoGravimetric (DTG) results revealed that the pure Jatropha Oil degraded fastest with a broad peak and a more comprehensive degradation temperature range (226.12 - 449.69°C) compared with modified nanofluid with a smaller degradation temperature range (229.11 -438.33 C). Therefore, it was concluded that the nanoparticle cutting fluid modified with TiO2 (0.15% concentration) can be adopted as cutting fluid for machining operations. 2024-12-01T00:00:00Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/31325 Title: TECHNO-ECONOMIC ANALYSIS OF PAPALANTO GAS TURBINE POWER STATION, OGUN STATE, NIGERIA Authors: Oyebamiji, Muideen Oladele; Nasir, Abdulkarim.; Jiya, Jonathan Yisa; Bori, Ige; Abolarin, M. S; Abdullahi, A. A; Akande, S. A Abstract: ABSTRACT The persistent inadequacy of electricity supply in Nigeria has created the need to improve the operational efficiency and economic sustainability of gas turbine power plants. This study investigates the techno-economic performance of the Papalanto Gas Turbine Power Station (PGTPS), Ogun State, Nigeria, with emphasis on the effects of ambient temperature and compressor pressure ratio on turbine performance and electricity generation cost. Operational data collected between 2018 and 2020 were analyzed using the Brayton cycle thermodynamic model and regression analysis, while the economic feasibility was evaluated using the Levelized Cost of Electricity (LCOE) approach. The results showed that increasing ambient temperature from 296 K to 306 K reduced thermal efficiency from 0.1354 to 0.0938 and power output from 22.69 MW to 19.05 MW. Conversely, increasing the compressor pressure ratio from 7 to 13 improved thermal efficiency from 0.04 to 0.40 and increased power output from 22.5 MW to 42 MW. The estimated LCOE values were $0.0424/kWh, $0.0431/kWh, and $0.0436/kWh for 2018, 2019, and 2020 respectively, with variations mainly influenced by fuel cost and turbine performance. The study recommends the adoption of inlet air cooling systems, optimized compressor pressure ratios, and effective fuel management strategies to improve efficiency, reduce generation costs, and enhance sustainable electricity supply. Keywords: Gas turbine, Techno-economic analysis, Brayton cycle, Power generation, Ambient temperature, Levelized Cost of Electricity 1 INTRODUCTION 2026-01-01T00:00:00Z