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Resy Kumala Sari
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LPPM Universitas Pahlawan Tuanku Tambusai Jalan Tuanku Tambusai 23 Bangkinang, Kampar, Riau, Indonesia Kode Pos: 28411
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Journal of Engineering Science and Technology Management
Published by Universitas Pahlawan Tuanku Tambusai
ISSN : -     EISSN : 28287886     DOI : 10.31004/jestm
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering
Journal of Engineering Science and Technology Management is Jurnal Electronic that aims at the publication and dissemination of original research articles on the latest developments in all fields of engineering science and technology, including; Industrial Engineering, Mechanical Engineering, Material Engineering, Electrical and Electronics Engineering, Environmental Engineering, Civil Engineering, Management, Science, and Technology. Journal of Engineering Science and Technology Management is a International peer-reviewed journal dedicated to interchange for the results of high-quality research in all aspects of education and teaching. The journal publishes state-of-art papers in fundamental theory, experiments, and simulation, as well as applications, with a systematic proposed method, good review of previous works, expanded discussion, and concise conclusion. As our commitment to advancing education and teaching, the Journal of Engineering Science and Technology Management follows the open access policy that allows the published articles to be freely available online without any subscription.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 164 Documents
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Analysis of Utilization of Liquid Smoke from Agroindustry Waste (Coconut Sheels, Palm Oil Bunches, and Palm Shells) Fahlin, Dhisti Khairunnisa; Lenggo Geni Katlin Jambak
Journal of Engineering Science and Technology Management (JES-TM) Vol. 5 No. 2 (2025): September 2025
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v5i2.393

Abstract

The increasing production of oil palm and coconut commodities has intensified environmental challenges associated with agro-industrial solid waste, particularly coconut shells, oil palm fruit bunches, and palm shells. This study aims to analyse the utilization of liquid smoke derived from these agro-industrial wastes and to evaluate their potential applications based on previous research findings. The study was conducted using a descriptive–analytical literature review, in which relevant scientific articles were systematically selected and analysed according to raw material type, pyrolysis process, chemical characteristics, and application of liquid smoke. The results indicate that liquid smoke derived from coconut shells generally exhibits higher phenolic content, making it suitable for antimicrobial, antifungal, and medicinal applications, while liquid smoke from oil palm residues shows strong potential as an organic pesticide, fungal control agent, and natural rubber coagulant due to its organic acid content. These findings demonstrate that agro-industrial waste can be effectively vaporized into value-added products through liquid smoke production, contributing to waste reduction and environmental sustainability. This study provides a comparative framework for selecting appropriate biomass sources for specific liquid smoke applications and supports the development of sustainable waste management strategies.
The Effect of Screen Exposure on Lecturer Health with Workload Mediation at the Indonesian University of Science and Technology Rizta, Sri Utami; Nurjanah, Tarbiyah; Syafriani, Mona
Journal of Engineering Science and Technology Management (JES-TM) Vol. 5 No. 2 (2025): September 2025
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The increasing use of digital technology in higher education has intensified screen exposure among lecturers, potentially affecting workload and health outcomes. This study examines the effect of screen exposure on lecturers’ health, with workload as a mediating variable, at the Indonesian University of Science and Technology. A quantitative causal-associative design was employed using a census method involving 65 permanent lecturers. Data were collected through an online questionnaire and analyzed using Structural Equation Modeling–Partial Least Squares (SEM-PLS). The analysis included validity and reliability testing, coefficient of determination (R²), predictive relevance (Q²), and hypothesis testing. The results indicate that screen exposure has a positive and significant effect on workload and a direct significant effect on lecturers’ health. However, workload does not have a significant direct effect on health and does not mediate the relationship between screen exposure and health. These findings suggest that adverse health effects related to screen exposure occur primarily through direct physiological and visual mechanisms. The model demonstrates strong explanatory and predictive power. This study contributes to empirical evidence on digital workload and occupational health in Indonesian higher education and offers practical implications for ergonomic and screen time management policies
Strength Analysis of Micro Wind Turbine Blade Structure Made of Composite Material Using Finite Element Analysis Maulana, Rafi Arifin; Puspitasari, Dewi; Abdi, Ferly Isnomo; Nugroho, Aji
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study analyzes the Structural Strength of micro wind turbine blades made of CFRP and GFRP composites using the Finite Element Analysis (FEA) method. Aerodynamic loads are obtained from QBlade simulations at a wind speed of 12 m/s and applied as non-uniform pressure on the blades. Composite modeling is performed with ANSYS Composite PrepPost (ACP) using a 4-ply laminated composite configuration with fiber orientations of 0°, 45°, −45°, and 90° and varying ply thicknesses along the blade. Static analysis shows that the CFRP blade produces a Von Mises stress of 15,648 MPa with a maximum displacement of 3.1616 mm, while the GFRP blade produces a stress of 12,786 MPa with a maximum displacement of 6,947 mm. These results indicate that CFRP has better Structural stiffness than GFRP, making it more suitable for micro wind turbine blade applications that require high Structural stability.
Analysis of Air Pollution Trajectory Using the HYSPLIT Model Tarif, Eqiu Alkahfi; Budhicahyanto, Moehammad; Darojat, Khumaidah
Journal of Engineering Science and Technology Management (JES-TM) Vol. 5 No. 2 (2025): September 2025
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v5i2.424

Abstract

The growth of industrial activities has contributed significantly to the increase in air pollutant emissions, adversely affecting human health and environmental quality. Understanding the direction and potential dispersion of air pollutants is therefore a crucial aspect of air pollution control efforts, particularly for mitigating transboundary and transregional impacts. This study aims to analyze the movement trajectories of air pollutants released from industrial stacks using the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model. Forward trajectory simulations were conducted for a duration of 240 hours (10 days) using meteorological data from the Global Forecast System (GFS). The emission source was assumed to be located in the Perawang industrial area, with a stack height of 100 meters above ground level. The simulation results indicate that during the dry season (East Monsoon), the dominant direction of air mass movement tends to be northward to northeastward, crossing the Malacca Strait and potentially reaching regions of Malaysia, Thailand, Vietnam, and southern China. These findings suggest a significant potential for long-range and transboundary transport of air pollutants, highlighting the need for strengthened industrial emission control and enhanced regional cooperation in air pollution management.
Combination of Starch and Pectin as Raw Materials for Making Edible Film Meldha, Zuqni; Fermi, Muhammad Iwan; Legawati, Lisa; Liska, Salma; Yolanda, Yogi; Hendri, Yola bertilsya; Amri, Idral
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.300

Abstract

Food spoilage, driven by factors like microbes and oxygen, is a major challenge in food preservation. Edible films offer an eco-friendly and biodegradable solution, acting as a protective barrier that reduces waste and extends a product's shelf life. While starch is a common and affordable material for these films, it has limitations, including poor water resistance and brittleness. This study investigates combining starch and pectin to create a superior composite edible film. This approach leverages the synergistic interaction between the two materials, which forms a more stable, dense structure through hydrogen bonds. This combination enhances key properties like tensile strength, flexibility, and water vapor resistance. The specific structure of the pectin, such as its level of methylation, is crucial, as it directly impacts how well it blends with starch and the film's final performance. By carefully controlling these interactions, the resulting edible films can achieve properties comparable to some fossil-based plastics, positioning them as a promising and sustainable alternative for food packaging. To support these findings, this research will analyze and review key performance factors from studies published over the past five years.
Vibration Pattern Analysis for Early Detection of Engine Component Faults Using Artificial Neural Networks Fauzi, Deni Nur; Syahrul Munir; Dimas Ari Setyawan; Dhovan Ilhamdan Prima; Imam Basuki; Aldy Prasetya Wibowo
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.309

Abstract

This study presents an integrated approach to vehicle vibration pattern analysis and early fault detection using Artificial Neural Network (ANN) modeling to address key maintenance challenges, including unplanned engine downtime and the limitations of conventional time-based preventive maintenance strategies. The research combines empirical vibration measurements obtained from internal combustion engines with a computational ANN model developed to automatically classify engine health conditions. The experimental phase focused on collecting vibration data under three operational states: normal, degrading, and faulty, each exhibiting distinctive vibration characteristics associated with combustion pressure variations and mechanical imbalance.A total of 500 vibration samples were recorded, with 400 used for ANN training and 100 for validation. The proposed feedforward multilayer perceptron (MLP) model achieved a classification accuracy of 94% with a mean squared error of 1.5 × 10⁻⁵. The ANN successfully identified transitional degradation patterns between normal and faulty states, demonstrating its capability for early fault diagnosis and supporting timely maintenance intervention and improved maintenance scheduling. Furthermore, the results reveal a strong correlation between combustion chamber pressure fluctuations and vibration amplitude, confirming that increased pressure irregularities lead to higher vibration energy levels. Overall, the proposed ANN-based vibration monitoring framework provides a non-invasive, cost-effective, and reliable solution for real-time engine condition assessment. By enabling early detection of mechanical degradation and reducing the risk of unexpected failures, the approach contributes to enhanced equipment availability, lower maintenance costs, and the effective implementation of predictive maintenance systems in automotive and industrial applications.
Efforts to Reduce Cargo Residue After Tank Cleaning Last Cargo Palm Stearin to Next Cargo Palm Olein in MT Loading Tank. TIRTASARI Farrahi, Naufal Afif; Lestari, Elise Dwi; Eddi, Eddi; Widyaningsih, Upik
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.330

Abstract

On chemical tanker ships, in addition to having strict safety regulations, the cargo is varied, sometimes with 2 or 3 different cargoes to be loaded. This requires the cargo tanks to be cleaned before loading the next cargo; however, there are often still cargo residues that can affect the quality of the cargo and cause failure during cargo tank inspections. This study aims to reduce the cargo residues that remain in the cargo tanks by observing several possible causes of the residues. This research uses descriptive qualitative research methods to address the problems occurring on the ship and employs data collection techniques including observation, interviews, and documentation, conducted while the researcher carried out sea practice on the MT Tirtasari ship for 12 months and 5 days, from October 5, 2023, to October 10, 2024.
Efforts to Increase Boil-Off Gas (BOG) Without Fuel Gas Pump in The State of Ballast Voyage at M.T. Coral Energy Airlangga, Areza Putri; Sutoyo; Kusumawati, Elly; Firdaus, Imam
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.333

Abstract

This study examines practical efforts to increase Boil-Off Gas (BOG) production without relying on the Fuel Gas Pump (FGP) during ballast voyage on the M.T. Coral Energy. In this condition, the vessel carries only a small amount of heel cargo, causing limited natural evaporation and a significant drop in tank pressure, which often results in insufficient BOG supply for the main engine. These operational constraints highlight the need for an alternative strategy that is both efficient and safer for cryogenic equipment.Using a qualitative descriptive approach, the research incorporates direct observation, structured interviews with deck officers, and operational documentation from the vessel. Data were analyzed using a fishbone framework to trace the root causes of low BOG production, focusing on technical, environmental, and human-factor aspects. The findings show that applying the top spray method using the deepwell pump effectively increases tank pressure and stabilizes BOG availability during ballast voyage. This method helps maintain a consistent gas supply for propulsion without adding mechanical load or maintenance risks to the FGP. The success of this approach depends largely on accurate flow control, careful pressure monitoring, and the crew’s understanding of the operational procedure. Overall, the study concludes that top spray is a reliable and energy-efficient alternative for BOG management when FGP use is minimized. The results are expected to support LNG carrier operations, particularly in optimizing fuel systems under low-cargo condition.
Optimizing The Implementation of Tank Coolingdown to Prepare For The LNG Loading Process on LNG Carrier Pan Africa Ships Dzaky, Muhammad Ahyar; Sutoyo; Kusumawati, Elly; Nur Prasetyo, Anugrah
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.334

Abstract

LNG cargo tanks are specifically designed to transport liquefied gas, and the coolingdown process becomes a critical stage prior to loading. This process is performed by spraying liquid gas through spray nozzles installed on the tank dome. This study employs a descriptive qualitative method, with data collected through observation, interviews, and documentation. The data were analyzed using the Miles and Huberman model, which consist of data condensation, data display, and conclusion drawing. The findings indicate that the coolingdown process on LNG/C Pan Africa generally complies with SIGTTO and IGC Code standards. However, two major issues were identified: a leakage in the cooldown valve on loading line number 2 caused by corrosion, which reduced the cooling rate from the standard 20°C/hour to approximately 10°C/hour, and a 1.5 hour delay in operating nitrogen system, which resulted in the IBS pressure not reaching the required 0.2-0.4 kPa. The study concludes that optimization of the coolingdown process can be achieved through preventive maintenance of the cooldown valve, improved coordination among officers, and enchanced accuracy in monitoring temperature and pressure. These recommendations are expected to improve the efficiency and safety pf LNG loading operations.
Optimization of Fire Hydrant Maintenance to Minimize Fire Incidents on Board MV. HABCO CARINA Setiawan, Budi; Widyaningsih, Upik; Amrullah, Romanda Annas; Haryanto, Tri; Sitepu, Firdaus
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm. v6i1.344

Abstract

Fires on board a ship are an emergency situation that poses a high risk to the safety of the crew, cargo, and the ship itself. Therefore, the readiness and quality of fire extinguishing system maintenance, especially fire hydrants, are crucial aspects in supporting shipping safety. This study aims to analyze the actual condition of fire hydrant maintenance on the MV Habco Carina, identify challenges encountered, and formulate maintenance optimization efforts to ensure the fire extinguishing system functions optimally during emergencies. The study used a qualitative descriptive method through direct observation on board the ship and interviews with the ship's officers and crew. The study was conducted during the researcher's 12-month sea practice on the MV. Habco Carina. The research results show that several fire hydrant components such as hoses, nozzles, valves, and fire pumps are not in optimal condition due to a lack of regular maintenance, minimal technical competence of some crew members, and weak supervision and documentation. This results in low water pressure and suboptimal system function during fire drills. Recommended optimization efforts include improving the quality of scheduled technical maintenance, strengthening the implementation of the PMS, improving crew competence through technical training, and routinely evaluating the effectiveness of the fire hydrant system. With the implementation of more structured and standardized maintenance, the fire hydrant system is expected to support ship preparedness in preventing and handling fires.

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