cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Yuliah Qotimah
Contact Email
yuliah@itb.ac.id
Phone
+6281221296669
Journal Mail Official
jets@itb.ac.id
Editorial Address
ITB Journal, Gedung CRCS ITB Lantai 6 Jalan Ganesa No. 10 40132 Bandung - Indonesia
Location
Kota bandung,
Jawa barat
INDONESIA
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 176 Documents
 14   15   16   17   18 
Probabilistic vs Deterministic Foundation Design: Impact of PDA and SLT Data on Required Safety Factor in an Indonesian Project Case Study Andreas Setiawan; Endra Susila; Indra Djati Sidi; Rio Leandro
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
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.2026.58.5.7

Abstract

Foundation design using the Allowable Stress Design (ASD) method is characterized by less consistent reliability that is difficult to quantify, leading to overly conservative or optimistic design. Therefore, this study aimed to implement the Reliability-Based Design (RBD) method in foundation design to achieve consistent reliability levels and evaluate the equivalent safety factor generated. The design process was initially conducted based on API method and updated using field test data, namely the Pile Driving Analyzer (PDA) and Static Load Test (SLT). Statistical parameter updating was performed using a statistical analysis through the Bayesian updating method. The results showed that RBD method was capable of explicitly quantifying uncertainties. Furthermore, the availability of more and higher-quality data contributed to a more accurate representation of uncertainty, causing a greater reduction in the required equivalent factor of safety. This showed that the probabilistic method enabled the application of a lower safety factor compared to the conservative value of approximately 2.5 commonly adopted in ASD, without compromising the target reliability. Through the addition of data from PDA and SLT testing, this study showed that the RBD method could significantly reduce the required safety factor to a value of 1.68.
One-dimensional Photonic Crystal with Defects to Detect Gelatine Containing Water Ary Syahriar; Nafis Riffat Syahriar; Muhamad Giri Suada; Kun Mardiwati Rahayu; Octarina Nur samijayani; Ahmad Husin Lubis
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
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.2026.58.5.4

Abstract

Gelatine is commonly found in food, pharmaceutical, health, and cosmetic products. However, its use has generated significant debate due to concerns about the numerous sources, particularly for religious reasons. For Muslims and Jews, gelatine derived from porcine sources must be avoided, as it is strictly prohibited by religious laws. The detection in these products is important, and this led to the design of an optical biosensor based on a one-dimensional (1D) photonic crystal (PhC) with a defect layer. The aim was to detect the distinctive characteristics of gelatine with high sensitivity. Additionally, the defect layer was placed in the center of the structure, where the gelatine solution was introduced. The designed PhC structure consisted of N layers of (ZnO/SiO₂)ᴺ/defect/(ZnO/SiO₂)ᴺ. The reflectance and transmittance characteristics of the PhC were calculated by using the transfer matrix method (TMM), performed with the MATLAB software. For simplicity, the normal incidence of light on the PhC was assumed to avoid the complexities of oblique angles. Sensor performance was evaluated by calculating sensitivity (S), quality factor (Q), figure of merit (FOM), resolution (RS), and detection limit (LOD). The biosensor achieved an average S, Q, FOM, RS, and LOD of 225.7694 nm/RIU, 2249.413, 806.3185, 0.1332, and 4.13 × 10⁻⁵, respectively. These metrics showed the simple PhC design was a highly sensitive, non-invasive detection platform for monitoring and identifying gelatine-based products that did not meet Halal and Kosher requirements. The novelty of the study centered on the application of a simple 1D PhC with a defect cavity to detect gelatine concentrations in both aqueous and oily solutions, a problem that had not been addressed in detail.
Valorization of Banana Peel Extract for Green Synthesis of Silver Nanoparticles: Physicochemical Characterization and Antibacterial Performance Ivy Bazar Divina; Syafiqah Syazwani Jaffar; Wilter Kisin; Rovina Kobun; Suryani Saallah; Jumardi Roslan
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
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.2026.58.5.5

Abstract

The growing demand for sustainable nanomaterial synthesis has driven interest in plant-mediated approaches that align with circular economy principles. This study presents a facile approach for generating silver nanoparticles (AgNPs) using Saba banana peel extract (Musa acuminata × balbisiana) as reducing and stabilizing agents. AgNPs were synthesised by reacting different ratios (1:1–1:12) of banana peel extract (BPE) with silver nitrate (AgNO₃, 1 mM) at 90°C for 2 h. Based on the UV-Visible spectra, the optimal BPE:AgNO₃ ratio was identified at 1:11. Fourier-transform infrared (FTIR) spectroscopy revealed that functional groups in the extract including hydroxyl, carbonyl and amine, were involved in the reduction of silver ions. Morphological analyses using Scanning electron microscopy (SEM) and Transmission Electron Microscopy (TEM) show the formation of spherical AgNPs with average size of 5.37 ± 1.36 nm, while energy-dispersive X-ray (EDX) analysis indicated a high silver content (73.87 wt%). The biosynthesised AgNPs displayed potent antibacterial activity against Staphylococcus aureus and Escherichia coli. These findings highlight the potential of Saba banana peel, an abundant and underutilized biomass, as a low-cost and sustainable resource for the green synthesis of AgNPs with promising antimicrobial properties and potential applications in biomedical, environmental, food and energy sectors.
Analysis of the Effect of Permanent Magnet Width on Cogging Torque of Interior LSPMSM Tuan Anh Le; Nhu Y Do
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
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.2026.58.5.8

Abstract

The line-start synchronous permanent magnet synchronous motors have the advantages of high efficiency and line-starting capability. However, this type of motor has the drawback of high cogging torque, which is the main cause of vibration and noise during operation. Analyzing the factors affecting cogging torque is essential and important in the design of these motors. This paper studies the impact of magnet width on cogging torque. Theoretical analysis and finite element method simulations for the test motor show that the cogging torque can be significantly high, reaching up to 5% of the rated torque of the motor. Research results indicate that cogging torque can be reduced by decreasing the width of the permanent magnet. However, reducing the magnet width adversely affects the startup characteristics, torque, and efficiency of the motor, demonstrating the existence of an optimal width that balances cogging torque and other parameters in motor design. Additionally, the research results have been validated through experimental modeling, showing a close correlation in the shape of the cogging torque and the back eletromotive force characteristics, with a small error of less than 5%.
Mitigating Maloperations of Generator Protection in Oil and Gas Facilities: A Coordination Strategy for Overcurrent and Overcurrent Voltage Restrained Relays Alvin Harista Rahman; Kevin Marojahan Banjar – Nahor; Nanang Hariyanto
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
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.2026.58.5.9

Abstract

The oil and gas industry requires a highly reliable and adaptive electrical protection system to prevent maloperation and ensure operational continuity. Unlike conventional industrial systems, electrical configurations in oil and gas facilities often feature short electrical distances between generators and loads, with some connected directly and others through transformers. This condition increases the risk of miscoordination in overcurrent relays (50/51 and 50/51V), potentially leading to widespread blackouts that may disrupt production processes and cause significant financial losses. Such maloperations are often linked to improper relay settings. Inaccurate modelling of time–current characteristic (TCC) curves and misadjustment of 50/51V relays can result in non-selective tripping, where the 50/51V relay operates before the 50/51 relay as the primary protection. This study proposes relay coordination strategies for three representative power system configurations in the oil and gas sector, which are evaluated through relay coordination simulations using power system simulation software. The approach considers for the unique characteristics of the 50/51V relay and equipment damage curves, using power system simulation software for evaluation. The results demonstrate that the proposed scheme avoids maloperation by maintaining IEEE standard coordination margins (0.2–1 s), ensuring relay curves remain below electrical equipment damage thresholds, preserving selectivity and preventing relay coordination maloperations. These findings provide practical guidelines for engineers in designing selective and reliable protection systems, thereby reducing blackout risks and supporting continuous operation in oil and gas facilities.
Defect-Engineered TiO2 Photocatalysts for Enhanced Methylene Blue Degradation Tri Partono Adhi; Galang Ananta Dwipayana; Dwiwahju Sasongko; I Gede Wenten; Hary Devianto; Wibawa Hendra Saputera
Journal of Engineering and Technological Sciences Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October
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.2026.58.5.10

Abstract

Textile wastewater containing synthetic dyes is a significant environmental concern due to its high color intensity, toxicity, chemical stability, and resistance to conventional treatment. This work prepared Ti3+ self-doped TiO2 photocatalysts using a simple sol-gel route combined with NaBH4-assisted calcination. The strategy was designed to generate intrinsic lattice defects, mainly Ti3+ centers and oxygen vacancies, in anatase TiO2 without the use of flammable reducing gases or complicated post-synthesis treatments. The influence of calcination temperature was examined by preparing samples at 200, 500, and 600 °C. XRD results showed that the selected samples maintained the anatase TiO2 phase, indicating that the reduction-calcination treatment did not produce detectable secondary crystalline phases. Higher calcination temperature increased the degree of crystallinity, with crystallinity values of 59.1%, 68.2%, and 69.6% for the samples of T-200, T-500, and T-600, respectively. Raman spectra confirmed the anatase framework and revealed features related to lattice disorder in the reduced samples, while EPR analysis directly confirmed Ti3+/oxygen-vacancy defect sites, with the strongest signal observed for T-600. UV-vis DRS demonstrated that the samples calcined at 500 and 600 °C absorbed more strongly in the visible region. The T-600 sample showed an effective band gap of 2.42 eV, evidencing that defect-related states contributed to broader light harvesting. Photocatalytic evaluation indicated that methylene blue degradation improved with increasing calcination temperature, and the best performance was obtained using T-600, with an apparent rate constant of 0.017 min-1. Reusability testing showed that T-600 retained activity for three cycles, although the rate constant decreased to 0.0116 and 0.0089 min-1 in the second and third cycles, respectively. The enhanced activity is attributed to the combined contribution of higher anatase crystallinity, improved visible-light response, and an appropriate concentration of Ti3+-oxygen vacancy sites that support charge separation and reactive oxygen species formation.

Page 18 of 18 | Total Record : 176

 14   15   16   17   18 

Filter by Year

2024 2026


Reset
Filter By Issues
All Issue Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October Vol. 58 No. 4 (2026): Vol. 58 No. 4(2026): August Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April Vol. 58 No. 1 (2026): Vol. 58 No. 1(2026): February Vol. 57 No. 6 (2025): Vol. 57 No. 6 (2025): December Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October Vol. 57 No. 4 (2025): Vol. 57 No. 4 (2025): August Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April Vol. 57 No. 1 (2025): Vol. 57 No. 1 (2025): February Vol. 57 No. 1 (2025): February Vol. 56 No. 6 (2024) Vol. 56 No. 5 (2024) Vol. 56 No. 4 (2024) Vol. 56 No. 3 (2024) Vol. 56 No. 2 (2024) Vol. 56 No. 1 (2024) More Issue