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Journal of Engineering and Technological Sciences
Published by Institut Teknologi Bandung
ISSN : 23385502     EISSN : 23375779     DOI : 10.5614/j.eng.technol.sci
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering
ournal of Engineering and Technological Sciences welcomes full research articles in: General Engineering Earth-Surface Processes Materials Science Environmental Science Mechanical Engineering Chemical Engineering Civil and Structural Engineering Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 132 Documents
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A Cobalt-based Nanostructured Electrode Prepared by a Fast Chemical Method Alhebshi, Nuha A.
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.4

Abstract

The demand for nanomaterials is rapidly increasing in most applications, such as energy storage devices. Many nanomaterial synthesis methods are energy-consuming methods requiring high temperatures, prolonged reaction time, complicated steps, or expensive equipment. Herein, nanostructures of cobalt hydroxide chloride, Co2(OH)3Cl, have been directly deposited on carbon cloth microfibers by a fast and simple step of chemical bath deposition. Co2(OH)3Cl nanoparticles appear in only 10 minutes of the deposition time, then the nanoflakes are grown in 60 minutes, as imaged by scanning electron microscope. The crystal structure of Co2(OH)3Cl is characterized using X-ray diffraction, while the results of energy-dispersive X-ray spectroscopy confirm the elemental analysis. The electrochemical energy storage mechanism of Co2(OH)3Cl electrode in potassium hydroxide electrolyte depends on the semi-reversible redox reactions as investigated by the cyclic voltammetry and by the galvanostatic charge-discharge measurements. As a result, the prepared electrode in 60 min exhibits a maximum specific capacitance of 313 F/g versus 293 F/g for the prepared electrode in 10 min, both at 1 A/g. The good electrochemical performance is attributed to several features, including the nanoflakes morphology that enables electrolyte ions to penetrate the electrode freely, the well-crystallized structure, and the solid electronic path between the current collector and the active material indicated by the Nyquist plot of electrochemical impedance spectroscopy. Our cost-effective synthesis of cobalt hydroxide chloride nanostructures on woven substrates offers flexible binder-free electrodes in alkaline electrolytes. This research opens up the potential for these materials to be used as a power source in smart textiles and wearable electronics, thereby contributing to the advancement of these fields.
Enhancement of Crashworthiness Parameters Using a Bitubular Tube with Various Tube Lengths Abdulqadir, Samer Fakhri; Ahmed, Zinah Jumaah; Khalaf, Wekar M.; Alrawi, Dhafer Fakir; Dawood, Haitham Kamil
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.8

Abstract

The study aims to investigate the effect of numerical analysis on a bitubular circular tube subjected to dynamic loading. To compare its performance, a circular monotube specimen with a perimeter of 300 mm, a thickness of 2 mm, and a length of 350 mm was used as a reference. The bitubular circular tubes consist of two tubes, an inner and an outer. The outer tube's perimeter was initially set at 350mm with a wall thickness of 1 mm, while the inner tube had a perimeter of 250 mm and a thickness of 1 mm. The outer perimeter was gradually decreased by 10 mm, while the inner tube's perimeter was simultaneously increased by 10 mm for each configuration. This process was repeated until reaching perimeter lengths of 305 mm and 295 mm for the outer and inner tubes, respectively. The outer tube's length remained fixed at 350 mm, the same as the reference tube's length. The inner tube's length was initially kept identical to the outer tube while changing the tube's perimeter, aiming to maintain the same mass insofar as was possible compared to the reference tube. The inner tube of each configuration was then shortened by 10 mm until reaching a length of 300 mm. Six specimens were selected as the best performers based on the lowest load and highest crush force efficiency (CFE) criteria using the complex proportional assessment (COPRAS) technique. The results revealed that the best design was the bitubular configuration with an outer tube perimeter of 340 mm, an inner tube perimeter of 260 mm, and an inner tube length of 320 mm. This configuration achieved a 44% reduction in peak force, a 19% increase in crash force efficiency (CFE), and a 3.7% decrease in mass compared to the reference monotube. These findings indicate that the chosen bitubular configuration achieves a desirable balance of reduced peak force and improved crash force efficiency, making it a promising design for energy absorption and occupant protection during collisions.
Evaluation of the Consolidation Parameters Obtained from Laboratory Tests for Numerical Modeling of Improved Soft Soil Using PVD at Semarang - Demak Toll Road, Indonesia Sari, Undayani Cita; Wardani, Sri Prabandiyani Retno; Muntohar, Agus Setyo; Partono, Windu
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.5

Abstract

The consolidation analysis becomes complicated when conducted on varying layers of soil. To simplify and solve these problems, designers often employ Finite Element Method (FEM) modeling, a widely used technique for analyzing geotechnical issues. However, many limitations associated with this method can lead to model results that do not accurately reflect actual conditions. Consequently, the consolidation settlement analysis during design may differ from actual conditions in the field. This study examines the influence of consolidation parameters and explores how to analyze consolidation settlement using FEM for practical applications. Specifically, consolidation settlement was assessed on the Semarang-Demak toll road, which utilizes a Preloading-PVD improvement method across nine Stationing (STA) locations with varying soil layers. Numerical modeling was performed using Midas GTS NX 2021 (V.1.1) and was validated against instrumentation observation results, Settlement Plate. An evaluation using the back analysis method was conducted to investigate the impact of consolidation parameters on the accuracy of the final consolidation settlement results. The consolidation parameters reviewed are the compression index (Cc) and recompression index (Cr). The findings indicate that the Cc and Cr significantly influence the final consolidation settlement. By optimizing these consolidation parameter values, the deviation between observed results and numerical modeling for final consolidation settlement is reduced to less than 1%. Additionally, this research derived empirical equations for calculating consolidation parameters based on the Liquid Limit, a fundamental laboratory test. The results of this study can be proposed to analyze consolidation settlement using FEM modeling for soft clay to stiff clay, providing valuable insights for practical applications.
Analysis of Recent Research and Innovations in Vibration-Assisted Hybrid Machining Processes Gupta, Kapil; Sarmah, Pallab; Pawanr, Shailendra
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.9

Abstract

Hybrid machining processes (HMP) have been developed to double the benefits of advanced or conventional machining processes by combining them. The challenges that occur in machining of intricate shapes and features, micromachining, and machining of very hard and soft materials can be overcome by HMPs. Assistance from external sources like vibrations, abrasives, and magnetic fields can facilitate material removal and enhance machining efficiency. This paper analyses some important recent research and innovations carried out in the domain of vibration-assisted HMPs and presents them to enrich the knowledge of scholars and researchers to establish the field further. The major focus of the article is to highlight the role of vibration assistance in facilitating both conventional and modern machining domains specifically covering electrochemical machining, electric discharge machining, turning, and their variants. Industry 4.0 and Sustainability-oriented innovations in advancing HMPs, involving leveraging digital technologies to enhance productivity while minimizing environmental impact, have also been featured
Optimizing Food Processing Efficiency: The Role of Forward Osmosis in Concentration Julian, Helen; Lestari, Puji; Wenten, I Gede; Khoiruddin, K
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.6

Abstract

This review comprehensively explores the application of Forward Osmosis technology in the food processing industry, focusing on its role in concentration processes. Amidst growing concerns over water scarcity, energy consumption, and environmental impact, Forward Osmosis emerges as a sustainable alternative to traditional methods, offering lower energy requirements and reduced environmental footprint. The paper delves into the theoretical foundations of Forward Osmosis, examining the osmotic process and the dynamics of semi-permeable membranes. It further investigates the technological implementations of Forward Osmosis in food processing, showcasing successful case studies and highlighting the technology performance advantages compared to other methods. Despite its potential, Forward Osmosis faces technical challenges, including membrane fouling and the need for efficient draw solution recovery mechanisms. Recent innovations in membrane and draw solution development are discussed, offering solutions to these hurdles and paving the way for more effective Forward Osmosis applications. The review also projects future directions and research needs to overcome existing limitations and fully harness Forward Osmosis capabilities. Through a critical analysis of current literature, this paper underscores Forward Osmosis transformative potential in making food processing more sustainable and efficient.
Correction to: Investigation of Liquefaction in Balaroa, Petobo, and Jonooge (Central Sulawesi, Indonesia) Caused by the 2018 Palu Earthquake Sequence Triyono, Rahmat; Widiyantoro, Sri; Zulfakriza, Zulfakriza; Supendi, Pepen; Rahman, Aditya Setyo; Gunawan, Mohamad Taufik; Oktavia, Nur Hidayati; Rahmatullah, Fajri Syukur; Fadhilah, Fildzah Zaniati; Habibah, Nur Fani; Sativa, Oriza; Permana, Dadang; Wallansha, Robby; Octantyo, Ardian Yudhi; Persada, Yoga Dharma; Pranata, Bayu; Sujabar, Sujabar
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.10

Abstract

Correction to:  Journal of Engineering and Technological Sciences https://doi.org/10.5614/j.eng.technol.sci.2024.56.3.1   The article titled "Investigation of Liquefaction in Balaroa, Petobo, and Jonooge (Central Sulawesi, Indonesia) Caused by the 2018 Palu Earthquake Sequence" , written by Rahmat Triyono, Sri Widiyantoro, Zulfakriza, Pepen Supendi, Aditya Setyo Rahman, Mohamad Taufik Gunawan, Nur Hidayati Oktavia, Fajri Syukur Rahmatullah,Fildzah Zaniati Fadhilah, Nur Fani Habibah, Oriza Sativa, Dadang Permana, Robby Wallansha, Ardian Yudhi Octantyo, Yoga Dharma Persada, Bayu Pranata, and Sujabar, was originally published electronically on thepublisher’s internet portal on 19 June 2024 . The corresponding author's affiliation at the time of publication was as follows: (1) Indonesian Agency of Meteorology, Climatology, and Geophysics, Jalan Angkasa 1 No. 2, Jakarta 10610, Indonesia; and (2) Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia.   Subsequently, the authors decided to update the corresponding author's affiliation to: (1) Geophysical Engineering Graduate Program, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia; and (2) Indonesian Agency of Meteorology, Climatology, and Geophysics, Jalan Angkasa 1 No. 2, Jakarta 10610, Indonesia.   The original article can be found online at https://doi.org/10.5614/j.eng.technol.sci.2024.56.3.1
Enhancing Biogas Production through the Co-Digestion of Indigofera and Cow Manure for Electricity Generation Suyitno, Suyitno; Juwana, Wibawa Endra; Muqoffa, Mohamad
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.1

Abstract

The research examines the augmentation of biogas generation through the co-digestion of Indigofera tinctoria waste and cow manure, emphasising the optimization of parameters for enhanced efficiency. Anaerobic digestion presents potential for sustainable waste management and renewable energy generation. The initial discussion underscores the significance of Indigofera tinctoria, alongside challenges in managing agricultural and organic waste. The methodology encompasses substrate preparation, reactor design, and biogas utilization for electricity generation. Results indicate that substrate feeding rates and pH levels significantly influence biogas production, with optimal efficiency observed when pH is maintained between 6 and 7. Feeding rates are identified as a critical factor, highlighting the necessity for precise optimization. Additionally, managing hydrogen sulfide content is vital to mitigate corrosion risks, which can be addressed through adjustments to substrate composition. An interaction analysis between substrate feeding rates and pH revealed no significant combined effects, emphasizing the importance of understanding individual parameter dynamics to maximize production efficiency. Optimal load conditions were identified, with diminishing returns observed beyond a specific threshold. This study provides valuable insights into improving biogas production efficiency from Indigofera tinctoria waste and cow manure. Key recommendations include the optimization of substrate composition and stringent pH regulation to promote sustainable biogas production practices. Future research is encouraged to further refine biogas technology and advance its application in renewable energy systems.
Decision Tree Machine Learning Approach for the Performance Prediction of Asphalt Mixes Modified with Waste Tyre Metal Fibre Khan, Arsalaan; Sutanto, Muslich Hartadi; Khan, Nasir; Baarimah, Abdullah O.; Wahab, Mohamed Mubarak Abdul; Khan, Muhammad Imran; Ramu, Madhusudhan Bangalore; Khan, Rawid
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.2

Abstract

The Marshall stability and flow of asphalt mixes are key performance indicators of their durability and suitability for use in the pavement industry. Achieving the optimal bitumen content and volumetric properties through mix design is critical and depends on the characteristics of the materials used. Recycling waste materials in asphalt is also vital for promoting environmental sustainability. The development of machine learning models plays a crucial role in predicting the performance of such asphalt mixes. This study explores the use of a machine learning approach to predict the performance of waste tyre metal fibre-modified asphalt mixes. A dataset consisting of 75 experimental data points from various mix proportions was compiled to train and test the model. The study used 60/70 penetration grade bitumen and five modified mixes with waste tyre metal fibre (WTMF) contents of 0%, 0.375%, 0.75%, 1.125%, and 1.5%. Decision tree regression was effectively employed to establish the relationship between the input variables. The predictive ability of the model was assessed using R-squared, adjusted R-squared, and mean absolute error. The input parameters included fibre content, bitumen content, aggregate percentage, and porosity. Analysis of the input variables showed that stability decreased while flow increased with higher fibre and bitumen contents. With an R² of 0.901 for training and 0.937 for testing phases, decision tree regression proved to be an effective model for predicting the performance of these modified asphalt mixes.
Assessment of Job Satisfaction of Civil Engineers Working in the Transportation Sector of Bagmati Province, Nepal Musyaju, Samir; Sukamani, Dinesh; Kusi, Manita
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.6

Abstract

This is a quantitative study approach that aims to assess the job satisfaction among civil engineers employed in the Transportation Sector of Bagmati Province, Nepal. The Minnesota Satisfaction Questionnaire was used for the survey, and different analytical methods were used to look at the data. These included Principal Component Analysis (PCA), Structural Equation Modelling (SEM), and the Maximum Degree of Membership (MDM) principle for data analysis. The study found significantly low job satisfaction levels among transportation sector civil engineers. Four critical factors were identified as directly affecting job performance (JP): work culture (WC), work-life balance (WLB), employee engagement (EE), and job security (JSE). Notably, work culture emerged as the most influential component, accounting for 43.101% of the total variance (Eigenvalue = 10.344) in job satisfaction levels. These findings highlight WC as the predominant factor shaping engineers' performance and satisfaction in the sector. Moreover, SEM approach analysis confirmed the direct and significant relationship between work culture, work-life balance, employee engagement, and job performance. Meanwhile, there is a poor level of job satisfaction among private-sector civil engineers compared to government civil engineers. This research offers valuable insights regarding the determinants of job satisfaction among civil engineers in transportation and recommends strategies to improve their performance and enhance employee retention
Life Cycle Assessment of Decaffeinated Coffee Beans Production Shofinita, Dian; Lestari, Dianika; Fiorine, Fiorine; Rochili, Andreana; Raksajati, Anggit; Achmadi, Amarthya
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.3

Abstract

Life Cycle Assessment (LCA) analysis was conducted on the simulation of the production process of decaffeinated coffee beans using ethyl acetate (EA) and dichloromethane (DCM) solvents. The methods employed include the cradle-to-gate system, the ReCiPe 2016 midpoint method, and a hierarchic perspective on OpenLCA. The analysis used 320 kg of Robusta coffee beans per batch with the scope of analysis consisting of planting, postharvest, transportation, and decaffeination. The overall results of the hotspot analysis were human carcinogenic toxicity, marine ecotoxicity, global warming, freshwater ecotoxicity, and land use of 8 x 101  kg 1,4-dichlorobenzene eq, 1 x 101 kg 1,4-dichlorobenzene eq, 6 x 104 kg CO2 eq, 7 x 100 kg 1,4-dichlorobenzene eq, and 3 x 104 m2a crop eq for both EA and DCM. Comparison of the two solvents shows that the biggest environmental impacts were marine ecotoxicity, freshwater ecotoxicity, and human carcinogenic toxicity of 8.52 x 100 kg 1,4-dichlorobenzene eq, 5.44 x 100 kg 1,4-dichlorobenzene eq, 7.65 x 100 kg 1,4-dichlorobenzene eq for EA, and 8.52 x 100 kg 1,4-dichlorobenzene eq, 5.61 x 100 kg 1,4-dichlorobenzene eq, 8.03 x 100 kg 1,4-dichlorobenzene eq for DCM. Cultivation, extraction, and drying were the stages of considerable environmental impact. The application of agroforestry, reduction of inorganic and organic fertilizers, and the use of more environmentally friendly electricity sources serve as alternatives to reduce emissions.

Page 9 of 14 | Total Record : 132

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