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INDONESIA
Indonesian Physical Review
Published by Universitas Mataram
ISSN : 26151278     EISSN : 26147904     DOI : -
Core Subject : Science, Education,
Education Physics
Indonesian Physical Review is a peer review journal which is managed and published by Physics Departement, Faculty of Mathematics and Natural Sciences, Universitas Mataram. This journal is published periodically three times a year, in January, May and September. IPR is Open Accsess for all readers and includes research developments in physics both experimentally and analytically. Focus and scope include Theoritical Physics, Computation, Material sciences, Instrumentation, Biophysics, Geophysics, and Optics.
Arjuna Subject : -
Articles 254 Documents
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EXPERIMENTAL INVESTIGATION ON ELECTRICAL LOAD CHARACTERISTICS OF A MONOCRYSTALLINE PHOTOVOLTAIC PANEL UNDER RGB-FILTERED BROADBAND LED ILLUMINATION M. Raynaldo Sandita Powa; Afrizal Mayub; Euis Nursaadah
Indonesian Physical Review Vol. 9 No. 3 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i3.659

Abstract

RGB-filtered broadband illumination was applied to a monocrystalline photovoltaic (PV) panel under controlled indoor conditions to observe its electrical load characteristics. Optical red, green, and blue filters are used to produce RGB channel dominance in the transmitted light from a 5000 K LED source, without implying narrowband spectral separation. Sequential resistive loads (10 steps from 100 Ω to 4700 Ω) are applied to generate voltage–current operating points that reconstruct I–V and P–V characteristics under each filtering condition. Standard PV parameters, including estimated short-circuit current (Isc), open-circuit voltage (Voc), maximum power point (MPP), and estimated fill factor (FF), are derived from load-based curve extrapolation. Lux measurements are recorded alongside the electrical data to provide a comparison with photometric brightness. The results show a consistent ordering of electrical performance where green-filtered illumination produces higher current and power output than red and blue under the present experimental conditions. The maximum power under green filtering is approximately 54% higher than red and more than 400% higher than blue. However, since irradiance and spectral power distribution are not measured, differences in transmitted light intensity across filters may also contribute to the observed electrical variations, in addition to wavelength-related effects. The comparison using Isc/Lux and Pmax/Lux is presented only as an illustrative indicator and does not represent a physically rigorous photovoltaic performance metric. Therefore, the findings are interpreted as RGB-filtered broadband effects that are qualitatively consistent with known silicon spectral response behavior, rather than as direct spectral characterization. This work provides a practical, low-cost indoor protocol to observe photovoltaic response trends using accessible instrumentation without spectroradiometric equipment.
LOCAL SEISMIC RESPONSE AND EARTHQUAKE VULNERABILITY ZONING AROUND THE BOGOR FAULT, KEPAHIANG REGENCY, BENGKULU Nurul Apriyanti; Muchammad Farid; Arif Ismul Hadi; Hana Raihana; Arya Putra Anggi; Clora Ulandari
Indonesian Physical Review Vol. 9 No. 3 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i3.661

Abstract

Kepahiang Regency, Bengkulu Province, is located in the active tectonic zone of the Sumatran Fault System (Musi Segment), with the Bogor Fault running near residential areas, potentially increasing the risk of local earthquakes. This study aims to analyze local seismic response and map earthquake-vulnerability zones along the Bogor Fault using microseismic measurements from 40 observation points. This analysis integrates the parameters f0, A0, SVI, PGA, GSS, and Vs to evaluate the structural influence of the Bogor Fault on seismic response and earthquake vulnerability. The results show a range of values for f₀ of 1.64–17.97 Hz, A₀ of 2.15–9.15, SVI of 0.91–35.52, PGA 0.12–0.41 g, GSS 1.01 × 10⁻⁵–1.97 × 10⁻⁴, and Vs 183–2700 m/s, with location classes ranging from SA to SE according to SNI 1726:2019. Areas with low Vs values exhibit higher SVI, PGA, and GSS values, indicating stronger seismic amplification and greater potential for deformation. The distribution of these parameters aligns with the orientation of the Bogor Fault, suggesting a structural influence on the local seismic response. A comprehensive analysis of f0, A0, SVI, PGA, GSS, and Vs identified three vulnerability zones: high vulnerability along the central-to-northeastern corridor of the Bogor Fault and low vulnerability in the western and southwestern sectors. Microzonation mapping resulted in categorizing the study area into low-, moderate-, and high-vulnerability zones. This study revealed that the level of earthquake vulnerability in Kepahiang is largely determined by geological conditions, including the presence of faults, which can guide earthquake hazard mitigation efforts and the development of risk-based spatial planning.
SYNTHESIS OF NANOSILICA FROM TUKAD TELAGA WAJA SAND USING THE COPRECIPITATION METHOD WITH NaOH VARIATIONS Ni Kadek Cinta Eka Putri Jayanti; Ida Bagus Putu Mardana; Putu Yasa; I Komang Restu Widi Artha
Indonesian Physical Review Vol. 9 No. 3 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i3.676

Abstract

Volcanic sand is a potential natural silica source for the synthesis of high-value nanosilica materials. This study investigated the effect of NaOH concentration on the chemical composition, crystallinity, and morphology of nanosilica synthesized from Tukad Telaga Waja volcanic sand using the coprecipitation method. The utilization of Tukad Telaga Waja volcanic sand as a local precursor for nanosilica synthesis remains rarely reported, particularly regarding the influence of alkaline extraction conditions on nanosilica formation. The synthesis was carried out at 6 M, 7 M, and 8 M NaOH, followed by acid precipitation. The synthesized materials were characterized using X-ray fluorescence (XRF), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). The XRF results showed that increasing NaOH concentration improved the SiO₂ purity of the synthesized nanosilica from 96.4 wt% at 6 M to 98.9 wt% at 8 M, indicating enhanced silica extraction during alkaline dissolution. XRD analysis confirmed that all samples exhibited an amorphous structure, with a broad diffraction hump centered at approximately 23 ° in the 2θ range of 20°–30 °. SEM observations revealed irregular granular morphology with agglomerated particle structures. Image analysis of the SEM micrographs using a log-normal distribution approach indicated that the estimated SEM particle domain size decreased from 8.30 nm to 6.05 nm with increasing NaOH concentration. Among the investigated conditions, 8 M NaOH produced nanosilica with the highest purity and the smallest estimated SEM particle domain size. These findings indicate that NaOH concentration plays an important role in controlling silica extraction and the resulting characteristics of amorphous nanosilica synthesized from local volcanic sand. The synthesized nanosilica may be further explored for applications requiring high surface area, such as adsorbents, catalyst supports, and functional composite fillers.
CHARACTERISTICS OF MAMUJU CITY URBAN HEAT ISLAND BASED ON AIR TEMPERATURE AND LANDSAT 8/9 IMAGERY Abdul Rajab; Pariabti Palloan; Agus Susanto; Adi Prasetyo
Indonesian Physical Review Vol. 9 No. 3 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i3.679

Abstract

Rapid urbanization in Mamuju City, Indonesia, has altered land cover patterns and contributed to the development of Urban Heat Island (UHI) conditions. This study aims to analyze the spatial and temporal characteristics of UHI in Mamuju City during the dry season (June–September) from 2015 to 2024, and to examine the relationships between land surface temperature, land cover change, and atmospheric temperature. The study integrates ERA5 reanalysis air temperature data with Landsat 8/9 Level-2 imagery using the Google Earth Engine platform. Land cover classification was conducted using the Random Forest algorithm with 200 decision trees, incorporating spectral bands, spectral indices (NDVI and NDBI), and topographic variables. Land Surface Temperature (LST) was derived from Landsat thermal data. UHI intensity was calculated as the difference between mean LST of built-up and bare land areas (urban zone) and the mean LST of vegetated, agricultural, and water areas (rural zone). Pearson correlation analysis was applied on a per-year basis to assess relationships between LST, NDVI, NDBI, and ERA5 air temperature. The results show that UHI intensity remained in the strong category (ΔT = 5.1–7.6°C) throughout the study period. Mean LST increased from 30.6°C in 2015 to 32.1°C in 2024, accompanied by a 69.2% increase in built-up area and a 7.9% decrease in dense vegetation. Land cover classification achieved an overall accuracy of 72.0% with a Kappa coefficient of 0.65. LST showed a positive correlation with NDBI (r = 0.662–0.721) and a negative correlation with NDVI (r = −0.658 to −0.693). ERA5 air temperature showed a weak and statistically insignificant correlation with LST (r = 0.137, p = 0.707). These results indicate that observed surface temperature patterns in Mamuju City are closely associated with land cover composition and change, while coarse-resolution reanalysis data are not suitable for representing intra-urban thermal variability at the city scale.

Page 26 of 26 | Total Record : 254

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