https://journaljenrr.com/index.php/JENRR <p style="text-align: justify;"><strong>Journal of Energy Research and Reviews (ISSN: 2581-8368)</strong>&nbsp; aims to publish high-quality papers (<a href="/index.php/JENRR/general-guideline-for-authors">Click here for Types of paper</a>) in all areas&nbsp;of energy generation, distribution, storage, management, production, conversion, conservation, systems, technologies and applications, and their impact on the environment and sustainable development. Articles related to the environmental, societal, and economic impacts of energy use and policy will also be considered. By not excluding papers based on novelty, this journal facilitates the research and wishes to publish papers as long as they are technically correct and scientifically motivated. The journal also encourages the submission of useful reports of negative results. This is a quality controlled, OPEN peer-reviewed, open-access INTERNATIONAL journal.</p> en-US [email protected] (Journal of Energy Research and Reviews) [email protected] (Journal of Energy Research and Reviews) Tue, 18 Aug 2026 07:37:40 +0000 OJS 3.3.0.21 http://blogs.law.harvard.edu/tech/rss 60 https://journaljenrr.com/index.php/JENRR/article/view/533 <p>This study explores an alternative method for designing a PID controller aimed at optimizing the operation of buck converter applications. The study proposes a simple and direct formula based on comparing the coefficients of the transfer function parameters of the buck converter with those of the controller. The proposed controller was implemented and evaluated using the MATLAB/Simulink environment, and its performance was compared against that of an automatically tuned controller. Simulation results indicate that the tuned controller exhibits a steady state error of 0.17%. In contrast, the proposed controller offers superior tracking capability, zero steady state error, robust disturbance rejection, and operates approximately seven times faster than the tuned controller. The proposed controller offers a 100% accuracy and therefore can guarantee stable and efficient performance of buck converter operations. This research therefore underscores the potential of the new controller design to significantly enhance the reliability and efficiency of buck converter systems.</p> A. U. Essien, B. J. Robert, E. A. Ahmed Copyright (c) 2026 Author(s). The licensee is the journal publisher. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://journaljenrr.com/index.php/JENRR/article/view/533 Tue, 18 Aug 2026 00:00:00 +0000 https://journaljenrr.com/index.php/JENRR/article/view/534 <p><strong>Background:</strong> Biodiesel production from waste and locally available plant oils may support renewable fuel development while valorising lipid resources.</p> <p><strong>Aim:</strong> This study comparatively evaluated biodiesel yield, fuel properties and oxidative stability of biodiesel produced from waste cooking oil, coconut oil, palm kernel oil and African oil bean seed oil.</p> <p><strong>Materials and Methods:</strong> Biodiesel was produced by alkaline-catalysed transesterification. Yield, density, kinematic viscosity, acid value, flash point, cetane number, moisture content, calorific value, cold flow properties, oxidative stability and storage stability were evaluated using the stated ASTM, EN, AOAC and AOCS procedures. Data were analysed by one-way ANOVA at p &lt; 0.05.</p> <p><strong>Results:</strong> Biodiesel yield ranged from 88.7 ± 1.7% for African oil bean seed oil to 95.8 ± 1.1% for palm kernel oil. Density ranged from 0.869 ± 0.003 to 0.887 ± 0.004 g/cm³, while kinematic viscosity ranged from 4.06 ± 0.08 to 4.82 ± 0.12 mm²/s. Palm kernel oil biodiesel recorded the highest cetane number (62.8 ± 1.2), calorific value (41.3 ± 0.5 MJ/kg) and induction period (10.54 ± 0.24 h). Waste cooking oil biodiesel had the lowest induction period (6.94 ± 0.20 h) but retained acceptable measured fuel properties. Palm kernel and coconut oil biodiesel met the stated EN 14214 oxidative-stability threshold.</p> <p><strong>Conclusion:</strong> The evaluated feedstocks produced biodiesel with distinct yield, fuel-quality and stability profiles, with palm kernel oil showing the strongest overall performance and waste cooking oil remaining a viable waste-derived feedstock.</p> Omuluche Collins O., Ogbaji Henderson O., Usiabulu Godsday I., Cookey Cookey I., Oji Chihurumnanya O., Okpoji Awajiiroijana U., Isaac Ukeme O., Edodi Iyam O., Garuba Muhammed H. Copyright (c) 2026 Author(s). The licensee is the journal publisher. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://journaljenrr.com/index.php/JENRR/article/view/534 Thu, 20 Aug 2026 00:00:00 +0000