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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
Arjuna Subject : -
Articles 239 Documents
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ANALYTICAL SOLUTION OF THE GENERALIZED FRACTIONAL NEWTON’S COOLING LAW BY GENERALIZED FRACTIONAL LAPLACE TRANSFORM METHOD Wibowo, Supriyadi; Muslimah, Aliza; SISWANTO, SISWANTO
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 16, No 1 (2026): April ( Article in press )
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v16i1.101537

Abstract

Recently, generalized fractional calculus was introduced, and its properties were studied. The Generalized fractional calculus is an extension of conformable fractional calculus. The conformable fractional Laplace transform method has been proven to be effective, especially in solving the conformable fractional Newton’s cooling law equation. Therefore, it is necessary to define the generalized fractional Laplace transform and investigate its properties. Furthermore, the analytical solution to the generalized fractional Newton’s cooling law equation can be obtained using the generalized fractional Laplace transform method. The behavior of the solution is also analyzed for several values of fractional order and non-negative continuous functions.
FLUID ACTIVITY DETECTION IN KENDALISODO GEOTHERMAL MANIFESTATION, SEMARANG, INDONESIA, USING VP/VS RATIO Harmoko, Udi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 16, No 1 (2026): April ( Article in press )
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v16i1.116778

Abstract

In areas of moderate seismic activity in which there are quite a few ground motion records and in urban or industrial contexts where noise levels are high, site effects can be identified through experimental methods involving microtremor recordings. It is common practice to undertake subsurface structure surveys using microtremor analysis. This survey's main advantage is its ease of obtaining consistent results using observation data from multiple stations. The well-known phenomenon of spatial fluctuations in Vp/Vs has been applied to estimate spatial fluctuations in subsurface structures. Anticipating temporal variations Vp/Vs is plausible, particularly in regions such as geothermal fields. This paper's goal is to indicate the thermal water sources and recharge zones around Kendalisodo geothermal manifestations. a straightforward experimental method based on microtremor recordings. The exposed area containing the geothermal manifestation served as the site of the research program. Vp/Vs ratios were calculated at 24 noise measurement locations.   In the present investigation, we analyse the product Vp/Vs and its variations. These various combinations respond in different ways to various physical factors and offer distinct perspectives on the subsurface changes. The distribution of VS30, the most common single-value measurement that best captures the behaviour of seismic soil, was also examined in this study. The results of this study become quite understandable after some analysis of the Poisson ratio distribution, which shows a value of 0.45 near the manifestation, the multiplication of compressional and shear wave velocities indicates a well-porosity area, the character of the bedrock based on geological data in accordance with the shear wave velocity value around the manifestation indicates the intrusion of hard rock, namely igneous rock and finally the water flow pattern based on satellite imagery from the summit of Mount Ungaran towards the research location.
NUMERICAL TSUNAMI HAZARD MODELLING AT THE PANCER COAST - PUGER, EAST JAVA, INDONESIA Rozikan, Rozikan; Cahyono, Bowo Eko; Suprianto, Agus; Adhi, Aryono
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 16, No 1 (2026): April ( Article in press )
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v16i1.114864

Abstract

The southern Java subduction zone is one of the major tsunami hazard sources in Indonesia due to its potential to generate large megathrust earthquakes. This study evaluates tsunami hazards from a Mw 8.7 megathrust earthquake scenario using numerical modelling with COMCOT v1.7. A five-layer nested grid system is applied to simulate tsunami generation, propagation, and inundation from the Indian Ocean to the Pancer - Puger coast, Jember Regency, Indonesia. Earthquake source parameters are defined using the Wells and Coppersmith empirical relationships, while initial seafloor deformation is calculated using the Okada elastic dislocation model. Tsunami wave dynamics are analysed using Virtual Tsunami Gauges (VTGs). The results indicate that Puger Kulon and Mojosari villages experience the most severe impacts, with large wave amplitudes, strong currents, and inundation exceeding 20 m depths. Tsunami arrival times is about 21 to 27 minutes, providing a very limited evacuation window. The ETH (Estimated Tsunami Height) and ETA (Estimated Time of Arrival) maps show that low-lying, open coastal plains act as primary pathways for tsunami penetration. These findings emphasize the high vulnerability of the Pancer coast - Puger and the need for risk-based mitigation, improved evacuation planning, and strengthened local early warning systems.Keywords: tsunami; COMCOT; Pancer coast; inundation; arrival time
Effect of Coating Superparamagnetic Iron Oxide Nanoparticles with Oleic Acid and PEG on Their Properties For Magnetic Targeting Applications: A Review Arianna, Firyal Dhiya Khansa; Saragi, Togar; Risdiana, Risdiana
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.v15i2.101762

Abstract

Superparamagnetic iron oxide nanoparticles (SPIONs) with all their unique properties have great potential in biomedical applications, including cancer treatment using targeted drug delivery systems and magnetic hyperthermia therapy. However, the stability of nanoparticles and their biocompatibility are major challenges in the success of these applications. Coating nanoparticles with oleic acid and polyethylene glycol (PEG) is often used to improve their dispersion stability and biocompatibility. In this review, we will discuss how the properties of SPION such as colloidal stability, magnetic properties, hyperthermia properties, drug loading, and drug release capabilities are improved when SPION is coated with oleic acid and PEG. It was found that in general, coating using oleic acid and PEG would improve the properties of SPION, such as increasing the hydrodynamic diameter and zeta potential values, and decreasing the polydispersity index and coercive filed values, making it more suitable for biomedical applications. This review aims to provide a thorough understanding of coating strategies to optimize SPION performance in magnetic targeting applications, and identify challenges and opportunities for future development
Application of Very Low Frequency (VLF) Method for Underground River Estimation in Donorojo Sub-District, Pacitan Bahri, Ayi Syaeful; Rochmah, Khusnul Nur; Fajar, M. Haris Miftakhul; Rochman, Juan Pandu Gya Nur; Lestari, Wien; Fida, Fachri Almawali Abil
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 2 (2024): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i2.83171

Abstract

Pacitan is included in the Gunung Sewu karst area in the Southern Mountain Zone, and carbonate rocks dominate the constituent rocks. Karst has a unique drainage system because it is dominated by subsurface flow. This research was conducted in Cemeng and Klepu villages, Donorojo sub-district, Pacitan, with 4 track data. Data were collected using the very low frequency electromagnetic (VLF-EM) method with a track length ranging from 200-450 m, a measurement spacing of 5 m, and a transmitter frequency of 19.8 kHz. Data processing uses filtering and inversion, resulting in a cross-section of resistivity values. Based on the subsurface resistivity cross-section profile, the cavity in the carbonate rock layer with a resistivity value of 0-500 Ωm is identified as an underground river. The underground river is found on tracks 1, 2, 3, and 4 near the surface, with a depth of about 30 m below the surface.
Analysis of ASA and Wood Characteristics with Variations in Thickness and Infill Density as 3D Printing Phantom Radiology Material Suharyana, Suharyana; Yunianto, Mohtar; Aldicia, Ivara Salsabila Putri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 1 (2025): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i1.110516

Abstract

This research was conducted to identify wood filaments and ASA as potential organ phantoms based on material density, CT number, electron density, effective atomic number, and radiation dose parameters. The thickness and density of the samples were varied to determine the effect on each parameter. The sample image was obtained from a CTScan radiology test with the same exposure factor. The potential of samples as organ phantoms varies for each parameter. In wood filament samples, a thickness of 1 cm to 2 cm with a density of 20% can potentially be a lung organ phantom. Meanwhile, at a thickness of 5 cm with a density of 100%, it can potentially act as a phantom for bone, liver and muscle organs. In ASA filament samples with a thickness of 1 cm to 5 cm with a low density of 20%, it has the potential to be a lung organ phantom and at a density of 100% it has the potential to be an adipose tissue phantom. 
Estimate The Focal Mechanism of Earthquake in Indonesia By Using 1-D Convolutional Neural Network (CNN) Palupi, Indriati Retno; Raharjo, Wiji; Alfiani, Oktavia Dewi; Apriyanti, Dessy; Wahyuningrum, Dwi
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.v15i2.84593

Abstract

Indonesia is located between three collisions of active plate tectonics (Pacific, Eurasia, and Australia), resulting in a high seismicity zone, especially along the subduction zone. Besides the subduction zone, there are also many faults as a result of these collisions. As the earthquake source, both are controlled by focal mechanisms. Focal mechanism is the geometry of fault movements. Unfortunately, Indonesia's earthquake catalog data is not complete. There is missing information in some focal mechanism data, especially the data with more than 6 Magnitudes between January 1st, 1973, and February 1st, 2023. To complete the focal mechanism data, 1-D Convolutional Neural Network (CNN) is applied as the common and powerful method of Machine Learning. Started by grouping the earthquake catalog data with clear focal mechanism information as the training data with its training label and otherwise as the test data with the unknown label, then applied these training and label data to convolutional layer with some neurons, CNN can estimate focal mechanism (label) of the test data. This process is done iteratively, and a good model is observed with little loss value in the L curve.
Analysis of Vegetation Index Values and Sugar Content in Sugarcane Based on Planting Age using Sentinel-2 Satellite Data Umniyah, Inas Alfiyatul; Cahyono, Bowo Eko; Suprianto, Agus; Hakim, Farid Lukman
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.v15i2.106287

Abstract

This study the relationship between the age of sugarcane plants (Saccharum officinarum L.), vegetation indices, and sugar content using Sentinel-2 satellite imagery in Jember Regency. Vegetation indices such as NDVI, GNDVI, NDRE, and NDII were used to monitor the physiological condition of the plants, while sugar content was measured using a refractometer on the upper, middle, and lower sections of the sugarcane stalks. The results indicate that the highest sugar content was found in the lower stalk section, as this area serves as the primary storage site for sucrose. There is relationship that increasing plant age correlates with changes in vegetation index patterns, peaking during the maximum vegetative phase. These findings offer significant insights into technology-based sugarcane land management, supporting the optimization of harvest timing, irrigation, and fertilization.
EVALUATION OF PATIENT-SPECIFIC QUALITY ASSURANCE (PSQA) USING OCTAVIUS 4D IN IMRT PLANNING FOR NASOPHARYNGEAL CANCER CASES Endarko, Endarko; Rahayu, Rizki Budi; Alifiani, Rustika; Hariyanto, Aditya Prayugo; Almira, Levina
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 16, No 1 (2026): April ( Article in press )
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v16i1.111531

Abstract

Patient-Specific Quality Assurance (PSQA) is an important procedure for verifying the accuracy of dose planning before administering radiation therapy to patients. This study aimed to evaluate the suitability of dose distribution in three variations of IMRT plans for nasopharyngeal cancer cases in two patients using the PTW Octavius 4D phantom and Verisoft software. Three irradiation plans were created based on variations in the optimization objectives for organ risk at the TPS, namely Plan0 (no optimization), Plan1 (moderate priority optimization for the parotid gland, brainstem, and spinal cord), and Plan2 (high priority optimization for the parotid gland, brain stem, and spinal cord). PSQA measurements were performed using a gamma index with criteria of 3%/3 mm, 3%/2 mm, and 2%/2 mm. The fluence map results showed that all irradiation plans had fluence patterns consistent with the TPS calculations without significant deviations in areas outside the target. The gamma passing rate (GPR) values for the 3%/2 mm criterion were 97.1−99.8% for Plan0, 96.1%−98.6% for Plan1, and 95.5%−99.5% for Plan2, all of which were above the tolerance limit of ≥95% as recommended by AAPM TG-218. For the 2%/2 mm criterion, all plans achieved a GPR above 90%, in accordance with the AAPM TG-119 standard for complex IMRT plans. These results indicate that the linac dose delivery system and MLC movement function consistently and are capable of reproducing the fluence according to TPS calculations. Thus, the use of Octavius 4D as the PSQA standard was effective for verifying the accuracy of IMRT plans in this study, and the 3%/2 mm criterion is recommended as a clinical evaluation parameter. 

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