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Sahrul Hidayat
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INDONESIA
Jurnal Ilmu dan Inovasi Fisika
Published by Universitas Padjadjaran
ISSN : 25490516     EISSN : 25497014     DOI : http://dx.doi.org/10.24198/jiif
Core Subject : Science, Social, Engineering,
Computer Science & IT Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology
JIIF (Jurnal Ilmu dan Inovasi Fisika) is a scientific journal that contains research results covering theoretical, simulation and modeling studies, experiments, engineering and exploration in the field of Physics and its Applications.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 195 Documents
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Forward Modeling and Seismic Wave Inversion for Amplification Analysis in The Java Subduction Zone Using Python Yudha, Pradipta Kusuma; Yulianto, Agus
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 10, No 2 (2026)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v10i2.70212

Abstract

This study aims to analyze seismic wave propagation and amplification in the Java subduction zone using a numerical modeling approach. The method integrates forward modeling and seismic inversion within a two-dimensional finite difference framework to simulate wave behavior in heterogeneous subsurface conditions. Secondary data, including seismic velocity, density, and earthquake parameters, are used to construct the subsurface model. The results show that seismic wave propagation is strongly influenced by variations in subsurface properties. High amplification occurs in regions characterized by low shear-wave velocity and thick sediment layers. Quantitatively, amplification exceeds 2.0 in areas with shear-wave velocity below 2000 m/s, while regions with higher velocity (>3000 m/s) exhibit lower amplification values. The application of multi-parameter inversion improves the resolution of subsurface structures and enhances model accuracy. The spatial distribution of amplification identifies zones that are more susceptible to strong ground motion, confirming the dominant role of subsurface heterogeneity in controlling seismic response. This study provides a quantitative and dynamic framework for understanding seismic wave behavior and offers a robust basis for seismic hazard assessment and earthquake risk mitigation in the Java subduction zone 
Zonasi Kerentanan Likuifaksi Berbasis Liquefaction Potential Index (LPI) di Kecamatan Seberang Musi, Kabupaten Kepahiang Qotrunnada, Mutia; Mase, Lindung Zalbuin; Supriani, Fepy; Azzahra, Raisya; Lubis, Aminah Rahmadhani; Misliniyati, Rena; Amri, Khairul
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 10, No 2 (2026)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v10i2.70698

Abstract

This study aims to evaluate and map earthquake-induced liquefaction potential in Kandang and Temdak Villages, Seberang Musi District, Kepahiang Regency. The analysis integrates geotechnical and seismic parameters, including peak ground acceleration, shear wave velocity, earthquake intensity, and soil vulnerability index. The results indicate that the study area is dominated by high ground acceleration and strong to very strong shaking intensity, which act as the main triggering factors of liquefaction. The evaluation of subsurface conditions shows that liquefaction potential mainly occurs in shallow layers composed of loose and saturated soils, while deeper layers tend to be more stable. The liquefaction potential index values vary significantly, ranging from low to very high across different locations. The highest value reaches 76.04, indicating very high liquefaction potential, while the lowest value is approximately 4.45, indicating lower potential. These findings suggest that the thickness and dominance of vulnerable layers at shallow to intermediate depths are the main factors controlling liquefaction potential. Overall, the applied approach provides a representative assessment for identifying liquefaction-prone zones and supports earthquake risk mitigation planning in the study area.
Effect of Annealing Temperature on ZnO Properties for CO2 Reduction Fitrilawati, Fitri; Junita, Tri Komala; Mori, Ersika; Rayhan, Abel; Hendrawan, Kayla Putri; Aprilia, Annisa; Faizal, Ferry
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 10, No 2 (2026)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v10i2.70746

Abstract

Zinc Oxide (ZnO), is a widely researched material for Carbon Capture applications due to its large surface area and adequate band gap. In this study, ZnO was synthesized using the sol-gel method with various annealing conditions, namely without annealing and annealing at 150°C, 300°C, and 450°C. The annealing process is carried out under inert conditions using a flow of nitrogen gas (N₂) to study the possibility of the appearance of defects in the ZnO material related to the process. XRD measurements showed that the size of ZnO crystals increased and there was a more regular structure as the annealing temperature increased. FTIR measurement results show the intensity of vibrational peaks that tend to be narrowed and more defined. SEM measurement results show a more defined morphology with a more uniform and fine particle size in ZnO annealed at 300°C and 450°C, thus affecting the atomic composition. EDS results show that the percentage of atomic O in ZnO decreases, indicating the presence of oxygen vacancies. ZnO that has a large crystal size has a band gap value that tends to decrease (red shift) so that it can slow down the recombination process and can increase its photocatalytic activity. Cylic Voltammetry (CV) test results from with ZnO as electrode, showed that ZnO annealed at high temperatures caused an increase in current density and a more negative potential change
Systematic Literature Review: Utilization of Agricultural Waste as Raw Material for Renewable Energy Biobriquettes Ilahiyah, Fitratul; Ruyani, Aceng; Firdaus, Muhammad Lutfi
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 10, No 2 (2026)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v10i2.68470

Abstract

The global energy crisis and environmental degradation caused by fossil fuel consumption have driven the search for sustainable alternative energy sources. Agricultural waste, which is abundant and often underutilized, has significant potential as raw material for biobriquettes in renewable energy production. This Systematic Literature Review (SLR) aims to comprehensively analyze research related to the utilization of agricultural waste as biobriquette feedstock during the period 2012-2025. The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) method was used to screen 200 articles from Web of Science, Scopus, and Google Scholar databases, with 40 articles meeting the inclusion criteria. The review results show that agricultural wastes such as rice husks, corn cobs, bagasse, and coconut shells have competitive calorific values (3.000-7.000 cal/g) meeting solid fuel standards. Factors affecting biobriquette quality include raw material type, binder type (tapioca, molasses, clay), compaction pressure (100-1,000 kg/cm²), and particle size. Indonesia, with agricultural waste production reaching 136 million tons per year, has biomass energy potential of 49.810 MW. Biobriquette development not only offers effective waste management solutions but also contributes to greenhouse gas emission reductions of up to 335.679 tons CO₂-eq per 100,000 tons of biobriquettes. This SLR identifies research gaps and provides recommendations for developing more efficient and sustainable biobriquette technology.
Analysis of Air Preheater Effectiveness using The Number Transfer Unit (NTU) Method Before and After Overhaul of Unit 2 of The West Java Palabuhan Ratu PLTU Fitriyani, Elsa; Nurhilal, Otong; Setianto, Setianto
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 10, No 2 (2026)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v10i2.71545

Abstract

The air preheater (APH) is a heat exchanger component that plays a crucial role in improving boiler combustion efficiency through the reuse of hot exhaust gases. Continuous use of the APH at the Jabar 2 Palabuhan Ratu PLTU can lead to a decline in performance, characterized by reduced heat transfer effectiveness. To restore APH performance, an overhaul was performed, including cleaning and replacing the elements. The analysis was based on actual operating data by comparing pre- and post-overhaul conditions at nearly equivalent loads using the NTU-effectiveness method, as well as calculating the effect of O₂-based air leakage. The results showed that the overhaul improved the APH's performance. Under pre-overhaul conditions with a load of 333.86 MW, the effectiveness value was 85.04%, increasing to 87.72% at a load of 329.75 MW after the overhaul. At a load of 336.98 MW, the effectiveness increased from 85.68% to 87.30% at a load of 346 MW after the overhaul. At a load of 284.33 MW, the effectiveness increased from 85.82% to 87.10% at a load of 282.99 MW after the overhaul. Furthermore, the air leakage value decreased from 13.54% to 11.47% after the overhaul.

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