Journal of Evrímata: Engineering and Physics

Analysis of Soybean Raw Material Inventory Control Using the Economic Order Quantity (EOQ) Method at the Terang Tofu Factory

Kusno Hadidjija — 2025-03-17

Kebonagung Terang Tofu Factory is one of the famous tofu industries in Pasuruan City. This business produces raw tofu. This research aims to determine the optimal amount of soybean raw material inventory that the Kebonagung Terang Tofu Factory must have, the right time for repurchasing soybean raw materials, the optimal purchase frequency, and the optimal total ordering costs for procuring soybean raw materials at the Terang Tofu Factory. Kebonagung, Pasuruan City. This research is quantitative descriptive, which describes how the company controls raw material inventories through analysis of the data obtained. The analysis methods used include Economic Order Quantity (EOQ) to determine the optimal amount of raw material purchases, Re-Order Point (ROP) to determine the right time for repurchasing raw materials, annual purchase frequency, Safety Stock (SS) to determine the amount safety stock that the company must have, and Total Inventory Cost (TIC) to determine the company's total storage costs. The results of the analysis using the EOQ method show that the Kebonagung Terang Tofu Factory should order 62,740 kg of soybean raw materials in 2024 with an order frequency of 7 times, ROP of 7.956 kg, Safety Stock of 5,874 kg, and total storage costs of Rp. 172.535.

Performance Analysis of LiFePO4 Batteries as a Replacement for Motorcycle Accumulators

nila — 2025-03-20

Conventional motorcycle batteries, including wet and maintenance-free types, suffer from limited lifespan, sulfation issues, and high maintenance requirements. This study proposes a LiFePO4 battery pack as a superior alternative, integrating a real-time monitoring system for enhanced performance tracking. Compared to conventional batteries, the developed system offers longer cycle life, improved thermal stability, and reduced maintenance. The battery pack consists of LiFePO4 cells (3.2V 6Ah) arranged in a 4-series 1-parallel configuration, delivering a 12V 6Ah output while maintaining compatibility with standard motorcycle battery dimensions. Experimental testing validates the system’s ability to monitor current, voltage, and temperature parameters effectively. The integration of a data logging system further ensures long-term reliability and optimization of battery performance. This research contributes to advancing motorcycle battery technology by enhancing durability, safety, and real-time performance monitoring.

Nigerian Construction Industry Reforms and Private Sector Involvement: X-raying Cost Engineering Roles in Sustainable Infrastructure Procurement

Amadi Alolote Ibim — 2025-04-11

This study examines the essential financial oversight cost engineering functions performed in the procurement of sustainable infrastructure. This is against the backdrop of the Nigerian construction industry, which has undergone significant transformation through targeted government policies and reforms, aimed at addressing procurement gaps and enhancing infrastructure development. As a result, innovative procurement methods have been adopted to ensure sustainability in public infrastructure projects. Cost engineering and financial management functions are necessary to ensure fiscal accountability in public project procurement. A systematic review of the extant literature is carried out to x-ray cost engineering roles in sustainable infrastructure procurement. Findings indicate a shift from a predominantly public sector-led approach to one driven by private investment, presenting new opportunities for cost engineering roles. Cost engineering expertise is needed in contract administration, risk mitigation, and financial planning and is instrumental in optimizing Public-Private Partnership (PPP) agreements and ensuring long-term project viability. The study underscores the need for Quantity Surveyors, who are professionally skilled in carrying out cost engineering functions, to strategically position themselves within the evolving procurement landscape to leverage emerging opportunities. This study therefore underscores the importance of diversification, and adaptability in navigating industry shifts in the cost management of public infrastructure projects. By embracing these principles, cost engineering roles will maintain relevance in sustainable infrastructure development. There is thus a need to strengthen the connection between government policies, innovative procurement methods, with a view to catalyse cost engineering functions, and their impact in sustainable infrastructure development.