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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 244 Documents
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AFTERSHOCK CHARACTERISTICS OF THE 2018 PALU EARTHQUAKE: IMPLICATIONS FOR SUPERSHEAR RUPTURE SEGMENT Muzli Muzli; Karen H Lythgoe; Rayhan Irfan Hielmy; Rahmat Triyono; Shengji Wei
Indonesian Physical Review Vol. 9 No. 2 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i2.666

Abstract

A temporary nodal array was deployed shortly after the Mw 7.5 Palu earthquake in September 2018 to record the aftershocks. Here, we present high-resolution aftershock locations and moment tensors, obtained from the temporary array combined with permanent broadband stations. The results are used to define the fault geometry and seismogenic depth. We find that there are very few aftershocks along a long, straight section of the Palu-Koro fault, which ruptured at supershear speed. Aftershocks tend to cluster north and south of this straight section. Secondary strike-slip faults to the south and east of the main fault were triggered. Additionally, we record an earthquake swarm occurring in the Adang volcanic zone, which began approximately 1 month after the mainshock. Given the smaller number and lower magnitude of aftershocks, we suggest that supershear ruptures pose a lower seismic hazard than corresponding subshear earthquakes. However, the strong shaking from a supershear rupture may pose other hazards, such as disastrous liquefaction. Lastly, we suggest that the ability to deploy short-period nodal arrays rapidly makes them a powerful tool for aftershock studies.
SENSITIVITY OF THE PARAMETRIZED POST NEWTONIAN PARAMETER γPPN TO COSMOLOGICAL MODELS IN STRONG GRAVITATIONAL LENSING Yasmin Mufidanisa; Agustina Widiyani; Azrul Sulaiman Karim Pohan; Ikah Ning Prasetiowati Permanasari; Annisa Novia Indra Putri
Indonesian Physical Review Vol. 9 No. 2 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i2.680

Abstract

The parametrized post-Newtonian (PPN) parameter γ measures spacetime curvature per unit gravitational potential, with general relativity (GR) predicting γ = 1 exactly. Strong gravitational lensing at galactic scales offers a cosmological-scale avenue for estimating γ beyond solar system experiments; however, such estimates depend sensitively on angular diameter distances, which in turn depend on the assumed cosmological model. We perform a controlled sensitivity analysis using 40 Sloan Lens ACS (SLACS) strong lensing systems with catalogue SIE Einstein masses MEin fixed under a fiducial ΛCDM cosmology, while varying the background model across ΛCDM, wCDM, Dynamical Dark Energy (DDE), and Early Dark Energy (EDE), all adopting Planck 2018 parameters. Angular diameter distances are computed by numerically integrating the model-specific expansion function E(z), so that any variation in recovered γPPN reflects cosmological distance geometry rather than a gravitational signal. ΛCDM, wCDM, and DDE yield effectively degenerate estimates: mean γ ≈ 1.08 ± 0.020, with inter-model spread of only ~0.5–0.7%. EDE yields a systematically lower mean γ = 0.903 ± 0.019, approximately 16.3% below ΛCDM and below the GR prediction of unity. This shift arises because EDE elevates H(z) near matter-radiation equality (z ~ 3000), compressing angular diameter distances by ~10% relative to ΛCDM; since the γ estimator scales as DL × DS / DLS, this compression propagates into a downward shift in recovered γ. The total inter-model range of ~17% substantially exceeds statistical uncertainties in targeted lensing studies, establishing cosmological model selection as a leading systematic in lensing-based γ measurements. EDE in particular introduces a distinctive geometric signature not captured by late-time dark energy parameterizations. Because MEin is fixed under ΛCDM, these findings should not be interpreted as evidence for or against GR, but as a geometric sensitivity analysis within a specific set of modeling assumptions.
MICROWAVE-ASSISTED GREEN SYNTHESIS OF CARBON DOTS DERIVED FROM MELON PEEL WASTE AS AN ECO-FRIENDLY FLUORESCENT SENSOR FOR Fe³⁺ CONTAMINATION Rahmat Firman Septiyanto; Azfa Restu Putra; Yudi Guntara
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.v9i3.594

Abstract

This research successfully demonstrates the valorization of melon peel waste into fluorescent carbon dots (CDs) using a straightforward microwave-assisted synthesis method. The synthesized CDs were comprehensively characterized, revealing optimal optical properties for sensing applications. Ultraviolet-visible spectroscopy revealed characteristic absorption peaks at 260 nm and 305 nm, corresponding to the carbon core and surface functional groups, respectively. Furthermore, photoluminescence spectroscopy under 245 nm excitation showed a strong blue emission peak at 453 nm. The practical utility of these nanoparticles was confirmed through their application as a fluorescent sensor for Fe³⁺ ions. The interaction resulted in significant fluorescence quenching and a distinct blue shift of the emission peak to 448 nm, indicating high sensitivity and a strong quenching response, leading to a ~67% decrease in emission intensity. These findings confirm that melon peel-derived CDs are a promising, eco-friendly material for developing effective probes for detecting heavy metals in environmental monitoring.
PETROGRAPHIC CHARACTERIZATION OF BASALTIC ROCKS FROM THE BREUEH VOLCANIC FORMATION, BREUEH ISLAND, INDONESIA Akmal Muhni; Alfi Syahrin; Lia Fitria Rahmatillah; Dewi Sartika; Dina Gunarsih; Amsir Amsir; Dian Darisma
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.v9i3.644

Abstract

The Breueh Volcanic Formation on Breueh Island, Aceh Besar District, is part of the outer arc volcanic zone related to subduction between the Indo-Australian and Eurasian plates. In addition, the volcanic rocks exposed on Breueh Island provide important geological information for understanding the volcanic history, tectonic processes, and magmatic evolution in the outer arc region of Aceh.  This study aims to determine the rock classification using optical petrography, and to evaluate its possible relationship to the regional tectonic setting. Petrographic analysis was performed on three basaltic rock samples collected from outcrops in the east–southeast area of the formation. Thin sections were examined under a polarizing microscope at Geological Engineering Laboratory Syiah Kuala University, and modal mineral percentages were quantified using the point-counting method with JMicroVision software. The analyzed rocks display massive to amygdaloidal textures, with amygdales filled by zeolite and celadonite. Petrographic observations show that the rocks are dominated by plagioclase (40.17–43%), pyroxene (3.58–20.17%), and opaque minerals (1–2.92%) as major constituents, with minor alkali feldspar (<6.5%), minor quartz (<2.33%), and olivine (~0.5%). Based on the IUGS/Streckeisen classification, all samples are classified as basalt. The occurrence of zeolite and celadonite indicates low-temperature hydrothermal alteration. The dominance of mafic minerals is consistent with basaltic magma typical of subduction-related volcanic settings. Overall, the petrographic characteristics suggest that the basaltic rocks are consistent with magma generated in a subduction-related outer arc volcanic environment.

Page 25 of 25 | Total Record : 244

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