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SI - Physical Society of Indonesia Sarijadi Blok 2 No 22 RT 008, RW 002, Kel. Sarijadi, Kec. Sukasari, Bandung, Jawa Barat, Indonesia. Kode Pos : 40151 ,mail: psi@fisika.or.id
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INDONESIA
Journal of The Physical Society of Indonesia
Published by Physical Society of Indonesia
ISSN : -     EISSN : 26853841     DOI : https://doi.org/10.35895/jpsi.xxx
Core Subject : Science,
Physics
The Journal of the Physical Society of Indonesia JPSI provides an international platform for advancing knowledge in physics emphasizing high quality research that spans theoretical experimental and applied domains JPSI welcomes submissions that push the boundaries of traditional physics disciplines while fostering interdisciplinary collaboration JPSI focus includes but is not limited to the following areas Astrophysics and Astronomy Exploring cosmic phenomena stellar evolution galactic dynamics and the frontiers of observational and theoretical astrophysics Nuclear and Radiation Physics Investigating reactor physics radioisotope applications particle interactions and neutron scattering techniques Atomic and Molecular Physics Delving into the quantum behavior of atoms and molecules spectroscopy and fundamental processes at micro and nanoscale levels Biophysics Bridging physics and biology to understand complex systems biomechanics and biophysical processes Condensed Matter Physics Examining the properties of solids and liquids including superconductivity magnetism and quantum materials Energy Physics Researching renewable energy energy storage and physics based innovations in sustainable energy solutions Geophysics and Atmospheric Physics Addressing Earth dynamics seismic phenomena meteorology climatology and atmospheric processes Material Physics Unveiling the synthesis characterization and application of advanced materials including nanomaterials and photonics Mathematical and Computational Physics Developing and applying mathematical models and computational techniques to solve physical problems across disciplines Optics and Quantum Physics Investigating the behavior of light optical systems quantum phenomena and emerging quantum technologies Particle Physics Studying the fundamental particles of the universe their interactions and implications for cosmology and beyond Physics Education Enhancing teaching methodologies curriculum development and innovative approaches in physics education Interdisciplinary Approach JPSI encourages interdisciplinary studies that combine physics with fields such as engineering biology chemistry and computational sciences The journal fosters a confluence of ideas methodologies and discoveries that contribute to the broader understanding and application of physics ASJC Code 3100 General Physics and Astronomy JPSI is committed to publishing research that not only advances the understanding of physical phenomena but also contributes to the practical and theoretical frameworks that shape the future of science and technology
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 25 Documents
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Wind Speed Forecasting Using Long Short-Term Memory (LSTM) and Meteorological Variables at Tanjung Perak, Surabaya, Indonesia Yesiska M Siallagan; Tugiyo Aminoto; Husnul Hamdi
Journal of the Physical Society of Indonesia Vol. 2 No. 2 (2026): October 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.2.72-86.2026

Abstract

This study evaluated Long Short-Term Memory (LSTM) models for wind-speed prediction using meteorological observations from Tanjung Perak, Surabaya, for 2015–2024. Air temperature, relative humidity, atmospheric pressure, and rainfall were used as predictors. Data preprocessing, alternative training–test partitions (70:30, 80:20, and 90:10), and model configurations were evaluated using root mean square error (RMSE) and mean absolute error (MAE). Among the configurations reported for the 80:20 partition, 50 LSTM units and 50 epochs yielded the lowest test errors (RMSE = 1.2965 knots; MAE = 1.0175 knots). For January 2025, reported forecast errors were RMSE = 1.4253 and MAE = 1.2261 knots for 7 days; RMSE = 1.3178 and MAE = 1.0943 knots for 14 days; and RMSE = 1.2117 and MAE = 0.8886 knots for 31 days. These results refer to different verification periods and do not establish superior performance at longer forecast horizons. Multiple linear regression identified significant associations with temperature, humidity, and pressure (p < 0.001), while rainfall was not significant (p = 0.164). Further chronological and operational validation is needed.
Natural Color Characteristics of Teak Leaves (Tectona grandis): Effects of Particle Size on Physicochemical and Optical Properties Lidya Febi Nababan; Hendry Izaac Elim; Herman Siruru
Journal of the Physical Society of Indonesia Vol. 2 No. 2 (2026): October 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.2.87-99.2026

Abstract

Teak leaves (Tectona grandis) are a potential source of natural dyes for textiles. This study investigated how dried teak-leaf powder particle size (40, 60, 80, and 100 mesh) affecs the optical characteristics, pH, and hot-water-extractable content of aqueous extracts and examined their application to cotton fabric. A completely randomized design with three replicates per particle-size treatment was used. Extracts were prepared in distilled water at approximately 60 °C for 1 h using a solid-to-liquid ratio of 1:10 (g/mL). Optical responses were measured using UV–Vis–NIR spectrometry over 350–950 nm, while pH and extractive content were evaluated using one-way analysis of variance. The largest absorption coefficients observed among the individual measurements were 4.192 cm⁻¹ at 391.1 nm and 4.075 cm⁻¹ at 575 nm, both in replicate II of the 100-mesh treatment. Particle size significantly affected extract pH (F(3, 8) = 18.96, p < 0.001), whereas its effect on extractive content was not statistically significant (F(3, 8) = 1.60, p = 0.264). The extracts colored alum-treated cotton fabrics, with visually observable differences among treatments. These findings indicate that particle-size selection can influence the optical response and pH of teak-leaf dye extracts; however, compound identification and quantitative textile colorfastness require further testing.
Correlation Analysis of Environmental Parameters and Photovoltaic Module Performance in a Tropical Savannah Climate Adeyemi Joshua Owolabi; Ige Olumide; Idris Mohammed; Rabiu A Tafida; Awujoola J Olalekan
Journal of the Physical Society of Indonesia Vol. 2 No. 2 (2026): October 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.2.100-117.2026

Abstract

This study investigates relationships between key environmental parameters and the performance of three commercially available polycrystalline photovoltaic (PV) modules operating under tropical savannah conditions in Afaka, Kaduna, Nigeria. A 151-day field experiment evaluated how cell temperature (CT), ambient temperature (AT), relative humidity (RH), and global solar radiation influenced module electrical behaviour. Environmental and electrical data collected under identical outdoor conditions were analysed using correlation and regression techniques. CT and AT showed a strong positive relationship (R² = 0.8583), identifying ambient temperature as a major driver of the module temperature. AT and RH showed a strong negative relationship (R² = 0.8772), while CT and RH exhibited a moderate negative relationship (R² = 0.6549). Global solar radiation ranged from 18 to 29 MJ m⁻² day⁻¹, contributing to module output variations. Open-circuit voltage depended weakly on solar radiation, whereas short-circuit current increased with radiation despite relatively low coefficients of determination attributable to environmental variability. Comparative analysis revealed distinct electrical responses among modules under identical climatic conditions. These findings demonstrate that temperature-related environmental factors play a dominant role in photovoltaic performance and should inform PV system selection, performance prediction, and deployment in tropical climates.
Multi-Source Observational Analysis of Significant Weather Conditions Associated with the Structural Damage at Terminal 3 of Soekarno–Hatta International Airport on 6 April 2026 La Ode Ashamad Nusriah; Syahrajad Al Syarqiyah
Journal of the Physical Society of Indonesia Vol. 2 No. 2 (2026): October 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.2.118-133.2026

Abstract

On April 6, 2026, intense rainfall (45.0 mm within one hour) coincided with ceiling failure at Gate 7, Terminal 3, Soekarno-Hatta International Airport, reported at 13:49 WIB (06:49 UTC). This study examines the associated weather using C-Band radar (CMAX), Himawari-9 imagery, Automatic Weather Station (AWS) records, ERA5 Low-Level Moisture Transport (LLMT), and radiosonde soundings. A compact convective system developed over the airport during 06:04–07:00 UTC, with radar reflectivity of 40–45 dBZ and cloud-top brightness temperatures of −62 to −69°C. AWS rainfall began at 06:10 UTC, peaked at 18.6 mm per 10 minutes at 06:30 UTC, and reached 45.0 mm by 06:50 UTC, accompanied by a 7.6°C temperature decrease and gusts up to 11.5 m s⁻¹. Cloud Convective Overlays (CCO) showed convective cloud growth south of the airport during 06:20–06:50 UTC. ERA5 LLMT at 925 and 825 hPa indicated enhanced moisture transport and a strong gradient near the airport, although its 0.25° resolution cannot resolve individual cells. The 00 UTC sounding showed weak CAPE (109 J kg⁻¹) and moderate KI (33.5); the 12 UTC sounding was post-event. Rainfall accompanied deep convection, but its causal role in ceiling failure remains unproven.
Carbonization of Ageratum conyzoides Leaves and Characterization for Supercapacitor Active Electrode Performance Muhammad Ikram Handaru Putra; Bidayatul Armynah; Arifin Arifin; Dahlang Tahir
Journal of the Physical Society of Indonesia Vol. 2 No. 2 (2026): October 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.2.134-144.2026

Abstract

This study evaluated the viability of the invasive weed Ageratum conyzoides as a carbon precursor for supercapacitor electrodes. The research aimed to determine the optimal carbonization temperature for maximizing the specific capacitance. The biomass underwent chemical activation using 0.3 M KOH. Subsequently, the samples were carbonized in an N2 atmosphere at varying temperatures (600, 700, and 800°C) and physically activated with CO2 at 800°C. Structural and morphological characterizations using thermogravimetric analysis (TG-DTG), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) confirmed the successful decomposition of organic components into a highly porous amorphous carbon network. An increase in the carbonization temperature directly correlated with a reduction in material density, indicating enhanced pore formation. Electrochemical measurements via cyclic voltammetry in a 1 M H2SO4 electrolyte revealed that the electrode carbonized at 800°C delivered a maximum specific capacitance of 75.97 F/g, compared to 58.21 F/g and 40.09 F/g for the 600°C and 700°C variants, respectively. These findings established both the ecological and technical potential of converting an invasive weed into functional energy storage materials.

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