http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/137 Thu, 18 Jun 2026 00:57:56 GMT 2026-06-18T00:57:56Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/30985 Title: Feasibility and Performance Characterisation of a Dual-Fuel Engine Automobile Using Premium Motor Spirit (PMS) and Compressed Natural Gas (CNG). Authors: Abdulrahman, L. T.; Okoro, U. G.; Alim, S.; Baba, A. M.; Opatola, R. A. Abstract: The increasing environmental and energy challenges associated with Premium Motor Spirit (PMS) in spark-ignition engines necessitate the exploration of alternative and cleaner fuels. This study investigates the feasibility and performance of PMS–Compressed Natural Gas (CNG) dual-fuel operation using a validated Computational Fluid Dynamics (CFD) framework in ANSYS Fluent. A high-fidelity 30° sector model of a single-cylinder engine was developed, incorporating PMS direct injection and CNG port injection, with simulations conducted across substitution ratios of 0–40%. Mesh independence and time-step sensitivity analyses were performed to ensure numerical reliability, and validation against experimental benchmarks confirmed deviations within ±5%. Results show that moderate substitution (20–30% CNG) achieves the most effective balance, maintaining brake thermal efficiency at ~38.8% and limiting power losses to less than 6%, while reducing CO₂ and NOₓ emissions by 22% and 26%, respectively. These findings demonstrate the potential of PMS–CNG dual-fuel technology as a cost-effective transition pathway toward sustainable transport, particularly in regions such as Nigeria where natural gas infrastructure is expanding. The study also provides systematic CFD-based optimization and detailed insights into in-cylinder flow dynamics, offering a valuable complement to experimental research. Wed, 01 Jan 2025 00:00:00 GMT http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/30985 2025-01-01T00:00:00Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/18691 Title: Rubber Scrap as Reinforced Material in the Production of Environmentally Friendly Brake Lining Authors: Lawal, Sunday Albert; Ugwuoke, Ikechukwu Celestine; Abutu, Joseph; Lafia-Araga, RA; Dagwa, IM; Kariim, I Description: Over the years, asbestos has been used as reinforcement material in brake lining production as a result of its good physical and tribological properties. However, recent studies have shown that asbestos poses a great health hazard which can result from its handling and breathing (NIH, 1989). As a result, it has lost its favor, resulting in the need to explore alternative materials. Hence, efforts by researcher have been geared toward finding a possible replacement for asbestos in the production of brake linings. These were exemplified by the work of several researchers who utilized other materials such as palm kernel shell (PKS), coconut shell, metal fibers, etc., for inclusion in brake lining in order to overcome environmental pollution (Ikpambese et al., 2016; Fono-Tamo and Koya, 2013). Also, a non-asbestos friction lining material was developed by Ibhadode and Dagwa (2008) using an agro-waste material–palm kernel shell, as a reinforcement material. Palm kernel shell (PKS) which was used as a reinforcement material was selected due to its favorable properties which superseded other agro-waste. The developed automobile disk brake pads using the derived friction material and the test results obtained indicated that high wear rate was observed on the PKS pad at high vehicular speeds of 80 km h À1 and above. Zaharudin et al.(2012) adopted Taguchi method to carry out a study on the effect of manufacturing parameters on the properties of friction materials. The parameters studied were molding pressure, molding temperature, and the molding time using semi-metallic friction materials and other additives. Physical properties such as … Fri, 01 Jan 2016 00:00:00 GMT http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/18691 2016-01-01T00:00:00Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/18122 Title: Rubber Tires Authors: Rodgers, M. B.; Abdullahi, Aliyu Alhaji Mon, 12 Dec 2016 00:00:00 GMT http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/18122 2016-12-12T00:00:00Z http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/18104 Title: Impact of Top Management Commitment on Implementation of Total Quality Management in an Organization Authors: Abolarin M.S.; Abdullahi A. A. Abstract: Adoption of any management strategy needs a framework as a blue print for its implementation and usually driven by the management. Therefore, this paper is aimed at presenting the role of top management commitment on implementation of Total Quality Management (TQM). This management philosophy is mainly concerned with continuous improvement in an organization, from high level strategic planning and decision-making to detailed execution of work elements on every level of the organization. An investigatory survey research approach (ISRA) method was adopted for the quantitative and qualitative data collection and collation from Shirror Hydroelectric Power Plant PLC. of Nigeria. It was ascertained that top/middle management commitment is a fundamental factor to be considered by an organization to implementation TQM. Fri, 01 Nov 2013 00:00:00 GMT http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/18104 2013-11-01T00:00:00Z