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VOL. 58 NO. 1
A curated issue featuring research on geoscience exploration, transportation emissions, tunnel engineering, advanced materials, renewable feedstock, electric motor cooling, concrete structures, seismic hazards, and timber joint performance.
Explore selected research articles based on editorial recommendation, readership engagement, and scholarly impact.
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Editor's Choice
Research Article
This study investigated flexural performance of Bangkirai timber beams jointed with glued-in threaded steel rods using epoxy-resin adhesive through experimental test and numerical analysis. Six beam specimens were tested under four-point bending with varying rod diameters, anchorage lengths, and beam widths: GIR B.65.16.17 (65 mm width, 16 mm rod, 170 mm anchorage), GIR B.65.12.25 (65 mm width, 12 mm rod, 250 mm anchorage), and GIR B.110.12.25 (110 mm width, 12 mm rod, 250 mm anchorage). The results showed that anchorage length significantly influenced moment capacity and stiffness of the beams. The highest average moment capacity was in GIR B.110.12.25 at 20.08 kNm due to its larger cross-section, while GIR B.65.12.25 showed a 58% higher moment capacity (16.57 kNm) than GIR B.65.16.17 (10.48 kNm). Elastic stiffness values were 538.60 kNm2, 809.44 kNm2, and 948.01 kNm2 in GIR B.65.16.17, GIR B.65.12.25, and GIR B.110.12.25, respectively, with longer anchorage lengths enhancing stiffness. The primary failure mechanism was epoxy-resin bond failure, leading to beam separation, while pull-out failure of steel rods was observed in some cases, particularly in specimens with shorter anchorage lengths. A 3-D nonlinear FEA was developed to validate experimental results. Differences between experimental and FEA results were within acceptable ranges, including 0.6-14.6% for elastic stiffness and 8.1-13.7% for moment capacity. Load-displacement curves obtained from the FEA correlated well with the experimental results, although the model slightly overestimated moment capacity due to the assumption of perfect bonding. These results provided insights for optimizing glued-in rod timber joints in structural applications.
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Most Viewed
Studying the basement depth and fault structures is crucial for understanding basin geometry and fluid migration pathways. This study aims to understand basin geometry using gravity data in the Banten area, Indonesia, as a region with possible hydrocarbon prospects. Anomaly gradients derived from the Bouguer anomaly were conducted for fault analysis. Meanwhile, basement depth estimation was performed using Euler deconvolution, with a Structural Index (SI) of 0 and window sizes of 7 km × 7 km and 10 km × 10 km. Additionally, 3D inversion modelling with Grablox 1.6 was applied to model the sediment-basement interface. The anomaly gradient results correlate well with regional fault structures, and local structures align with high-gradient areas in southern Banten. Furthermore, high-gradient values are associated with hydrocarbon seep locations, indicating fractures or faults transporting hydrocarbons. The depth estimations of Euler deconvolution cannot accurately identify the discontinuities forming the basin. However, they align reasonably well with the sediment-basement interface of the density model. The model reveals basin structures up to 7.8 km deep in the Bogor Basin and its surroundings, consistent with low residual anomaly areas, aiding in the early estimation of lateral basin boundaries.
Read more10.5614/j.eng.technol.sci.2026.58.1.1
Highly Cited
High-temperature melting and rolling is the key process of laminated steel production. The dynamic fluctuation of the rolling force during the film covering process causes an alternating effect of positive and negative pressures in the film covering area. The roll vibration causes the film to vibrate up and down, leading to the generation and intensification of bubbles, which seriously affects the product quality. In this study, considering the nonlinear stiffness characteristics of a polyethylene terephthalate (PET) film under unidirectional compression in the roll gap, a melting and rolling dynamic model with the structure and process coupled was established. Taking the melting layer and the rolling force as intermediate variables, process parameters such as strip temperature and rolling speed were introduced into the dynamic model, and the influence of process parameters on the film filling rate and the roll vibration displacement response was discussed. Considering the external disturbances of the strip thickness difference and the roll eccentricity, the dynamic characteristics of the rolling force, roll displacement, and filling rate under different strip temperatures and rolling speeds were analysed. The research results indicated that with an increase in the rolling speed and a decrease in the strip temperature, the filling rate, roll displacement, and rolling force increased, affecting the quality of laminated steel. Therefore, modeling the dynamic mechanism and studying the dynamic rolling force characteristics of the high-temperature melting and rolling process of laminated steel can provide a theoretical basis for controlling and optimizing of the film covering process.
Read more10.5614/j.eng.technol.sci.2026.58.1.2
Invited Paper
Rail transportations are among the most environmentally friendly modes of transportation due to their low per capita emissions and carbon footprint. This study aims to analyze the total CO2 emissions and per capita emissions of long-distance and local rail transports operating on the island of Java in 2023. Emission calculations were conducted using the IPCC methodology and Sebos’s approach, incorporating factors such as locomotive types, which predominantly use B30 biodiesel and electricity as energy sources. The results are presented in the form of spatial maps for a comprehensive visualization. Key findings indicate that high emissions and per capita emissions are not exclusively associated with rail transports operating in urban areas. Areas with high long-distance train emissions (> 30,000 tons of CO2) are OP VI Yogyakarta and OP VIII Surabaya. High per capita emissions (> 0.005 tons of CO2/capita/year) are OP I Jakarta and OP VII Madiun. Instead, factors such as travel frequency, route length, locomotive type, fuel type, and passenger volume significantly influence emission outcomes. Commuter trains contribute higher emissions than long-distance trains and local non-commuter trains. The highest total emissions were recorded for the Jabodetabek Commuter Line, amounting to 14,545,676 tons of CO2. This line also exhibited the highest per capita emissions due to its high operational frequency and daily service schedule. These findings highlight the need for strategies to optimize rail transports operations and minimize environmental impacts, particularly in high-frequency commuter services.
Read more10.5614/j.eng.technol.sci.2026.58.1.3
Last updated: 2026-05-15
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