Energy, Materials and Product Design
Energy, Materials, and Product Design is an open-access journal published by the Department of Mechanical and Industrial Engineering, Faculty of Engineering, University of Mataram, Mataram, West Nusa Tenggara, Indonesia. Articles approved and published in the journal are accessible to the public at https://journal.unram.ac.id/index.php/empd/index. Energy, Materials, and Product Design is a platform for publishing research results, case studies, and reviews related to mechanical engineering and its relationship to industrial engineering, such as heat exchangers, energy conversion (including solar, wind, ocean, and biomass), heat storage, materials and components (including manufacturing and metallurgy), electric vehicles or their components, and ergonomics applications in tool and workstation design, occupational health and safety (OHS), productivity, production and manufacturing systems, work design and reliability, material handling, optimization and simulation, quality control, and quality engineering. Articles can be written in Indonesian and English according to the Energy, Materials and Product Design journal guidelines.
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53 Documents
<![CDATA[ANALISIS SISTEM ANTRIAN TIKET TRANS JOGJA DI TERMINAL JOMBOR YOGYAKARTA ]]>
<![CDATA[Maharsa Pradityatama]]>;
<![CDATA[Pramudi Arsiwi]]>;
<![CDATA[Dony Satriyo Nugroho]]>
<![CDATA[ Energy, Materials and Product Design Vol. 5 No. 1 (2026): Energy, Materials and Product Design ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram ]]>
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DOI: 10.29303/empd.v5n1.354-361
<![CDATA[This study analyzes and simulates the ticket queue system of the Trans Jogja Bus Rapid Transit (BRT) at Jombor Terminal, Yogyakarta. Increasing passenger mobility and the growing demand for public transportation services have contributed to queue congestion during peak operating hours. The queue system operates using a single-channel single-phase model with a First Come First Served (FCFS) discipline. This research aims to evaluate the performance of the existing queue system and validate the simulation model using the trace-driven method. Data were collected through direct observation of 300 passengers, including arrival time and service time data. The simulation process was conducted using the Linear Congruential Generator (LCG) method and analyzed using the Mann-Whitney statistical test. The results show that the simulation model successfully represents the real system, with a service time error of only 0.13% and an arrival time error of 1.58%. Furthermore, the Mann-Whitney test indicates no significant difference between the simulation and the actual system, with probability values greater than α = 0.1. The findings demonstrate that the trace-driven simulation method is effective for modeling queue systems and can be used to support queue service improvement strategies at Trans Jogja shelters.]]>
<![CDATA[THE HYBRID SPOT WELDING – EPOXY BONDING PROCESS FOR AISI 1008 STEEL: THE EFFECT OF EPOXY ADHESIVE TYPE ]]>
<![CDATA[Paryanto Dwi Setyawan]]>;
<![CDATA[I W. Ogie Sabaniartha]]>;
<![CDATA[Andi Maulana]]>;
<![CDATA[Sugiman]]>;
<![CDATA[Sujita]]>;
<![CDATA[Suteja]]>
<![CDATA[ Energy, Materials and Product Design Vol. 5 No. 1 (2026): Energy, Materials and Product Design ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram ]]>
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DOI: 10.29303/empd.v5n1.362-375
<![CDATA[Hybrid joining technologies are increasingly being explored to overcome the mechanical and durability limitations associated with conventional resistance spot welding (RSW) and adhesive bonding in lightweight steel structures. However, despite the growing interest in spot welding–epoxy bonding (SWEB), the combined influence of adhesive curing behavior and welding thermal input on joint integrity and microstructural evolution remains insufficiently understood. In this work, a comprehensive experimental study was conducted on 0.8 mm AISI 1008 steel sheets joined using three commercial epoxy systems with different curing characteristics, combined with varying welding currents (50–80 A) and welding times (10–20 s). The investigation integrated mechanical shear testing with metallographic and compositional analyses to establish direct correlations between process parameters, microstructural transformations, and failure behavior. The findings reveal that the hybrid joints exhibit a synergistic load-transfer mechanism capable of significantly improving joint strength and energy absorption compared with conventional spot welds. Superior performance was consistently obtained using slow-curing epoxy under moderate welding conditions (~60–70 A and ~15 s), where a more stable interfacial interaction was achieved. In addition, localized carbon enrichment within the weld nugget, attributed to epoxy pyrolysis during welding, was identified as a previously underexplored phenomenon influencing joint behavior. The study provides new insight into thermo-chemical coupling in SWEB systems and proposes a practical pathway for tailoring hybrid joining performance through integrated process design.]]>
<![CDATA[DAMPAK PERBEDAAN LAJU AERASI SELAMA FERMENTASI TERHADAP KUALITAS BIOETANOL BERBAHAN MOLASE ]]>
<![CDATA[Tri Rachmanto]]>;
<![CDATA[I Made Adi Sayoga]]>;
<![CDATA[Fardiaz Anugrah Saputra]]>
<![CDATA[ Energy, Materials and Product Design Vol. 5 No. 1 (2026): Energy, Materials and Product Design ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram ]]>
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DOI: 10.29303/empd.v5n1.383-389
<![CDATA[Energy consumption is increasing along with the increase in population. At this time the use of energy can not be separated from everyday life. Energy needs still depend on fossil energy resources or petroleum. Bioethanol is a potential non-fossil fuel and can be used as an alternative fuel. Plants that can be used as bioethanol are starchy materials such as cassava, sweet potatoes, wheat and potatoes; sugary ingredients such as molasses (molasses). The purpose of this study was to determine the effect of variations in the rate of aeration during fermentation on the quality of bioethanol produced with molasses. Parameters of bioethanol quality observed were bioethanol content, volume of bioethanol, and calorific value. This study used variations in the rate of aeration during fermentation of 1 lpm, 1.5 lpm, and 2 lpm. Bioethanol is produced by fermenting molasses for 72 hours (3 days), then a distillation process is carried out to obtain bioethanol from molasses fermentation. The study produced the highest average bioethanol content and average bioethanol volume produced at an aeration rate of 2 lpm with an average bioethanol content of 86.67%. and an average bioethanol volume of 346.67 ml. The higher the alcohol content produced, the higher the calorific value. The highest calorific value was obtained from the 2 lpm variation with a sample content of 90% with a calorific value of 12456.60 Joules/g.]]>
