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INDONESIA
INDONESIAN JOURNAL OF APPLIED PHYSICS
Published by Universitas Sebelas Maret
ISSN : 20890133     EISSN : 24776416     DOI : -
Core Subject : Science,
Astronomy Energy Materials Science & Nanotechnology Physics
Indonesia Journal of Apllied Physics provides rapid publication of short reports and important research in all fields of physics. Indonesia Journal of Apllied Physics publishes articles that are of significance in their respective fields whilst also contributing to the disclipline of physics as a whole. Articles should be submitted to the Editorial Office of Indonesia Journal of Apllied Physics through this site. Further information on submission is also available at this site
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Articles 16 Documents
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Search results for , issue "Vol 15, No 2 (2025): October" : 16 Documents clear
Solar System Constraints on the Yukawa Potential in f(R) Gravity Romy Hanang Setya Budhi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.99471

Abstract

The  gravity theory is a modification of general relativity that yields a Yukawa gravitational potential in the weak-field limit. This potential modifies the Newtonian potential by adding an exponential term that depends on the parameters  and . In this study, we test the consistency of the Yukawa potential with observational data on the perihelion precession of planets in the solar system. Using observational data from the planets, we estimate the parameters  and  that are consistent with observations. Additionally, we analyze the constraints imposed by the Parametrized Post-Newtonian (PPN) formalism on these parameters. The results indicate that the parameter  can be taken within the range , with a relatively small value of . Observational constraints from the Cassini and MESSENGER missions also provide tight bounds on the PPN parameters  and . These findings suggest that the Yukawa potential in  gravity can explain gravitational phenomena on the scale of the solar system without violating existing observational constraints.
Performance Analysis of EPC Material as a Kidney Organ Phantom with Exposure Voltage Variations and PA-GF-Based Kidney Stone Size Cari Cari; Mohtar Yunianto; Fuad Anwar; Hardo Ardiansyah Gilang Permadi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.106579

Abstract

Research in the field of radiodiagnostics has been extensively developed, creating the need for substitute objects to represent human organs—namely, radiological phantoms. A phantom is a simulated model of an organ fabricated using 3D printing technology. This study aims to evaluate the suitability of Expanded Polyamide – Glass Fiber (EPA-GF) as a kidney stone phantom material embedded within a kidney phantom, based on parameters such as material density, CT number, electron density, and radiation dose across various CT scan exposure voltages. The phantom samples were printed using a dual-extruder 3D printer, with Expanded Polycarbonate (EPC) used as the kidney phantom material. CT scan exposure voltages were set to 80 kV, 100 kV, and 120 kV. Kidney stone sizes used in this study ranged from 1 mm to 8 mm (1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, and 8 mm). The measured density of EPA-GF was 1.51 ± 0.06 g/cm³. The CT numbers obtained at each voltage were 373.30 HU, 329.05 HU, and 299.46 HU, respectively. The corresponding electron density values were 1.231, 1.210, and 1.196, respectively. The effective doses measured at each voltage were 0.0240 mSv, 0.0448 mSv, and 0.0798 mSv. All parameter values were found to be closely aligned with literature references. The smallest visible kidney stone size detected was 2 mm.
Characterization and Cross-Sectional Modeling of the Newly Identified Rawup Fault Based on Relocated Hypocenters and Focal Mechanism in South Sulawesi Kevin Hanyu Clinton Wulur; Joshua Purba; Ramadhan Priadi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.104787

Abstract

This study presents an integrated seismotectonic analysis combining earthquake hypocenter relocation and P-wave polarity–based focal mechanism modeling to investigate the microseismic cluster in the Maros–Pangkep region, South Sulawesi. Using seismic data recorded by the BMKG network between 2019 and 2024, a total of 191 events were successfully relocated through the double-difference (HypoDD) algorithm, achieving a significant reduction in RMS residuals. The relocated hypocenters delineate a coherent northwest–southeast–trending fault plane with a strike of approximately 260° and a dip of 7–9°, consistent with a dextral strike-slip mechanism exhibiting minor oblique components. Integration with polarity-derived focal mechanisms confirms a consistent stress orientation compatible with regional compression along the Walanae Fault System. This alignment suggests the presence of a previously unmapped active structure, herein referred to as the Rawup Fault, accommodating local stress redistribution between carbonate and volcanic–clastic units. The findings advance the understanding of active deformation in low-seismicity, karst-dominated terrains and demonstrate the value of combining relocation and focal mechanism analyses for detecting hidden faults. These results provide new insights into the tectonic evolution and seismic hazard potential of the Maros-Pangkep.
Sea Wave Height Monitoring Prototype as an Early Warning System for Tidal Flood Disaster Samsul Muhayadi; I Wayan Sudiarta; Eko Pradjoko
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.107543

Abstract

Indonesia is an archipelagic country located between the Indian Ocean to the south and the Pacific Ocean to the north. As a consequence of this, during the rainy and transitional seasons, extreme weather occurs, especially in the southern coastal areas. According to data from the National Disaster Management Agency, in the last six years, more than 200 tidal waves and abrasion have hit the coastal areas of Indonesia. These conditions can lead to various disasters, particularly tidal flooding. Therefore, the development and design a wave height monitoring device as an early warning system for tidal flooding is necessary. This device is expected to play a vital role in disaster mitigation, because it can provide the information about the potential for tidal flooding based on the changes in wave height. The design of this device uses the LPD3806 encoder as a sensor and the nRF24L01 to send information to the monitoring station. Furthermore, running tests has been conducted and based on the results of the maximum distance test, information delivery can reach 800 meters in an open area with a maximum delay of 2 seconds. For sensor accuracy, a value of  99.7% was obtained, indicating the sensor has a small measurement error rate. On top of that, during field tests, the device demonstrated durability under bad weather, with no loss of data sent. This shows that this device can operate reliably under extreme weather environments.
Identification Sub-Surface Structure and Sediment Depth Estimation at the Proposed Indonesian New Capital City Yan Adi Segoro; Relly Margiono
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.96059

Abstract

In this study, we employ high-resolution GGMplus gravity satellite data and three-dimensional geological modeling to ascertain sediment thickness and subterranean structures in East Kalimantan, designated as Indonesia's prospective capital. The region's sedimentary basins, specifically the Kutai Basin with up to 14 kilometers of Tertiary sedimentary rocks, are pivotal in assessing seismic risk due to their potential to amplify seismic activity. Through Fourier transformation and power spectrum analysis, we discern the Simple Bouguer Anomaly (SBA) across the region, revealing an inverse relationship between SBA values ranging from -5 mGal to 145 mGal and topographical elevation. The Mangkalihat Peninsula showcases pronounced gravity anomalies corresponding to a complex geological matrix, including a carbonate platform and an extension of the Palukoro Fault system. The three-dimensional inversion modeling, across a 29,000 meters by 27,000 meters grid, identifies varying rock densities from 2.3 g/cm³ to 2.65 g/cm³, and delineates predominant rock types such as igneous granite, claystone, limestone, and sandstone. This is further validated by resistivity measurements, aligning with geological maps. The average regional depth estimates for sediment layers are -15274.93 meters for North-South transects and -13409.25 meters for West-East transects, with residual depth estimates suggesting sediment thickness up to -1988 meters. These granular insights enhance the geological model of East Kalimantan, providing a nuanced understanding of its geophysical framework and informing the developmental blueprint for Indonesia's future capital city.
Structural Optimization of Hydrogenated Amorphous Silicon Layers for Enhanced Solar Cell Efficiency Soni Prayogi; Nmenakota Benony Etwiory; Muhammad A
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.105724

Abstract

Energy conversion efficiency of hydrogenated amorphous silicon (a-Si: H) based solar cells remains a major challenge in the development of renewable energy technologies. One approach to improve this efficiency is through improving the solar cell layer structure. This research aims to maximize the layer structure of a-Si: H solar cells by using OghmaNano software simulation. This simulation allows in-depth analysis of the effect of bandgap variation as well as layer thickness on solar cell performance. The method used in this research is to perform numerical simulations using OghmaNano software. The a-Si: H solar cell model was built by varying relevant parameters such as substrate (glass), ITO, p i n layer, and metal contacts. Simulations were performed to obtain the I-V characteristics of the solar cell, which were then used to calculate the energy conversion efficiency. The simulation results were analyzed to identify the layer structure configuration that yielded the highest efficiency. The results hypothesize that determining the layer structure of a- Si: H solar cells can significantly improve the energy conversion efficiency. Variations in intrinsic layer thickness and bandgap have a significant effect on solar cell performance. With variations in layer thickness and bandgap, it is expected to maximize light absorption and increase energy conversion efficiency, which will significantly improve the overall performance of solar cells.
Instrumentation and Data-Processing Workflow for AMD Neutralization: Linking Rock Formation, Water-Quality Measurements, and Index Computation Yazid Fanani; Eko Teguh Paripurno; Tedy Agung Cahyadi; Ahmad Mushoffa; Andris Emanuel Korompis; Muhammad Rizky Redy Asmara; Dwi Fitri Yudwiantoro
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.108469

Abstract

We use the Integrated Geo-Hydrochemical Risk Assessment (IGHRA) as a workflow driven by instruments. This workflow connects (i) evidence from rock formations, (ii) repeated water-quality measurements, and (iii) calculations of indices to manage AMD neutralization. The evidence from formations, including sulfide-bearing, quartz/glass-rich, and widely sericitized units, shows why we need CaO to quickly restore pH and precipitate Fe and Mn. Meanwhile, sulfate (SO₄) remains stable and controls overall compliance. We conduct 5 bench tests per condition to assess a series of CaO doses (1–10 g L⁻¹) and a fixed-mass series of CaCO₃ sizes. With CaO, pH increases to about 6.0-6.4 at 10 g L⁻¹. Fe levels drop to about 7-11 mg L⁻¹, Mn to about 0.16 mg L⁻¹, and SO₄ to about 1.7-1.75 g L⁻¹. These changes help quantify the improvements during treatment and reveal the ongoing sulfate load. Indices calculated from post-treatment samples indicate that the PLI(dose) for Fe, Mn, and SO₄ decreases from about 3.2 at 1 g L⁻¹ to about 0.49 at 10 g L⁻¹. At the same time, Residual Risk (RR) falls from about 67% to about 17%. In contrast, the responses from CaCO₃ remain limited by kinetics at low pH, with high indices across different mesh sizes. To turn this chemistry into practical actions, we determine the size of the polishing step using HRT. Existing ponds (about 884 m³) with a flow rate of approximately 0.0256 m³ s-1 provide about 9.6 hours, which is below the target of about 84 hours. A redesigned cell about 10,125 m³ offers around 110 hours for handling solids and buffering performance. Overall, IGHRA transforms treatment-stage measurements into reproducible indices and clear residence-time goals for mine waters close to the surface.
Investigation of Groundwater Potential in Marsela and Bululora Villages, Masela Island, Southwest Maluku District Using VES and LEM Resistivity Data Matheus Souisa; Sisca M Sapulete; Sean O O. Souisa; Cici C.N. Ohoiner; Raras F Waimalaka; Leona Y Mataheruilla; Sansina L Pangely
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.73409

Abstract

Groundwater has a wider distribution than surface water because groundwater fills all the pores of the rocks and soil beneath the earth's surface. Groundwater is located in a layer of soil called the aquifer layer which can be identified by the resistivity geoelectric method. The hydrogeological survey conducted in this study included the characterization of aquifers such as rock types and aquifer types through the interpretation of subsurface conditions using the geoelectric resistivity mapping (LEM) method with the Wenner-Schlumberger configuration and sounding (VES) with the Schlumberger configuration. The results showed that the MarselaVes-1 (GeoM-01), MarselaVes-2 (GeoM-02), and BululoraVes-1 (GeoB-01) point areas have local aquifers with moderate productivity and wide distribution. These three geoelectric points have the potential for drilling. Meanwhile, the hydrogeology at the BululoraVes-2 (GeoB-2) point has an aquifer with low productivity.
Influence of High Sr2+ Substitution on the Structure and Photocatalytic Activity of Ba1‑XSrxTio3 for Dye Degradation Dianisa Khoirum Sandi; Trya Andini; Fahru Nurosyid; Yofentina Iriani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.107609

Abstract

Barium strontium titanate or BST (Ba1-xSrxTiO3) photocatalysts with distinct Sr substitutions (x = 0.5, 0.6, 0.7, and 0.8) were fabricated using the co-precipitation technique. This study aimed to investigate the influence of the high Sr2+ contents on the structural property and photocatalytic activity to identify the optimal composition. X-ray diffraction (XRD analysis) confirmed cubic BST formation at all Sr concentrations and reduced lattice constants with increasing Sr²⁺ contents. Fourier transform infra-red (FTIR) investigation also validated the formation of the prepared BST with different Sr contents. The photocatalytic activity of the BST photocatalysts was evaluated by the degradation of methylene blue (MB) under UV light irradiation. Notably, the photocatalytic efficiency improved at x=0.5 to x=0.7, attributed to enhanced lattice distortion induced by Sr substitution. However, a further increase of x = 0.8 resulted in reduced photocatalytic activity, likely due to the formation of a more symmetric structure and reduced crystal distortion. Ba₀.₃Sr₀.₇TiO₃ exhibited the highest degradation rate (41%) among all samples tested. The results suggest that the high Sr level critically affects the structural properties and photocatalytic efficiency of BST and underline x = 0.7 as the optimal composition for photocatalytic applications.
Polarization Angle Effect on High-Order Harmonic Generation in an Inhomogeneous Two-Color Laser Field Stephen Maina Njoroge
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.99915

Abstract

Theoretical investigation of the effect of the polarization angle on high-order harmonic generation in an inhomogeneous two-color field is reported. The results show that the use of two-color fields greatly enhanced the harmonic cutoff point in comparison with the one-color field from 70th to 90th orders in a homogeneous field. In addition, the introduction of an inhomogeneity parameter of 0.003 generated a broad supercontinuum of approximately 270 orders. However, an increase in the polarization angle adversely affected the harmonic cutoff.

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