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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 351 Documents
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Using FTIR Analysis to Investigate the Mineralogical Composition of Ultisolsa Alfisol in Southeast East Sulawesi, Indonesia Rosliana Eso; Tufaila Tufaila; Arman Arman
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.v15i1.87415

Abstract

This study aims to investigate the mineralogical composition of Ultisols and Alfisols using the X-ray diffraction (XRD) analytical technique and FTIR analysis to provide fundamental information on these soil types. Thirty samples of Ultisols and Alfisols were collected from six selected sites with different profiles (i.e., Profile 1, Profile 2, and Profile 3) where these soils occur on limestone parent material. We used the Kjeldahl method to determine total nitrogen, a soil pH meter to measure pH, and the X-ray fluorescence (XRF) method to analyze chemical elements. Additionally, XRD in conjunction with FTIR spectroscopy was used to examine the mineralogical composition of both soil types.The average total nitrogen content across all profiles ranged from 0.1% to 0.35% for Ultisols and from 0.1% to 0.92% for Alfisols. The soil pH indicated an alkaline reaction, ranging from 4.5 to 5.3 for Ultisols and from 4.8 to 6.2 for Alfisols.  Chemical element content obtained from oxides in all profiles included Si, Al, Fe, Mg, Ti, Ca, S, Na, K, P, Mn, Ni, Co, and Cr. Dominant Si trends, consistently increasing upward on both Ultisol and Alfisol sites, indicated significant soil development in the study area. The diffraction pattern graphics of topsoil from all profiles identified a 100% Silicon oxide quartz low (SiO2) phase with the trigonal (hexagonal axes) crystal system.  FTIR spectroscopy analysis showed progressive kaolinization in all Alfisol samples. In contrast, Ultisol Profile 1 expressed montmorillonite, while Profiles 2 and 3 attributed to kaolinite. FTIR results consistently 
Evaluating The Accuracy of Gridded Climate Datasets for Precipitation, Surface Air Temperature, and Sea Surface Temperature in Central Java, Indonesia Iis Widya Harmoko; Muhammad Zainuri; Anindya Wirasatriya; Supari Supari
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.v15i2.104276

Abstract

Studies of climate information that rely on accurate and reliable data are essential in hydrometeorological monitoring, early warning, and climate change impacts in areas with varied topography and limited observation data, such as Central Java, Indonesia. This study aims to assess the accuracy of gridded satellite and reanalysis on three main variables. Precipitation was analyzed utilizing CHIRPS, ERA5 Precipitation, and GSMaP products; surface air temperature (SAT) was assessed with ERA5-Land, FLDAS, and AIRS; and sea surface temperature (SST) was evaluated using OSTIA, RAMSSA, and GAMSSA. Observational data from six BMKG stations and iQuam functioned as the reference standard. The datasets were extracted using bilinear interpolation and evaluated using a bias, mean absolute error (MAE), mean absolute percentage error (MAPE), symmetric mean absolute percentage error (SMAPE) for precipitation, and root mean square error (RMSE). The evaluation showed that CHIRPS performed better estimation with the lowest RMSE and SMAPE (17.20 mm/day; 111.42 mm/month; 96.97% daily; 54.09% monthly) compared to ERA5-Precipitation and GSMaP. ERA5-Land in SAT showed better accuracy in MAE and MAPE of 1.2°C and <10% at most locations. For SST evaluation, OSTIA demonstrated the highest agreement with iQuam, showing RMSE of 0.246°C and MAPE of 0.552% in the Southern Sea, while GAMSSA recorded the highest errors across all zones. This study presents a variety of gridded dataset performances based on scale and time to illustrate the importance of validation against observational data. These results can guide researchers in processing the right dataset collection in climate applications in tropical ocean areas.
Earthquake Disaster Risk Assessment in Purworejo District, Central Java Province, Indonesia Chatarina Muryani; Sorja Koesuma; Pipit Wijayanti
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 1 (2024): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i1.76180

Abstract

Purworejo Regency is directly adjacent to the Indian Ocean and is close to the Java subduction, so it is estimated to have a high earthquake risk index. This study aims to analyze the earthquake disaster risk in Purworejo District, Central Java Province, Indonesia. Earthquake risk analysis methods follow Perka BNPB No 02 of 2012, including hazard, vulnerability, and capacity analysis. The disaster risk index combines the disaster, vulnerability, and capacity indexes. The findings of this study reveal the following: (1) 295 villages within Purworejo Regency fall into the high earthquake hazard category, primarily located in the southern region of Purworejo or near the Java subduction zone. (2) The high vulnerability to earthquakes is widespread across almost all villages in Purworejo Regency. The highest concentration of villages with a high vulnerability index is found in Ngombol District (57 villages), Butuh District (41 villages), and Purwodadi District (40 villages). (3) Purworejo Regency exhibits a capacity to cope with earthquakes that are not categorized as low. The majority, comprising 464 villages (93.92%), falls within the middle class, while 30 villages (6.08%) are classified as having a high capacity. (4) Within Purworejo Regency, 117 villages (23.7%) are at a high risk of earthquakes, and 376 villages face a moderate risk. Only one village has a low disaster risk index.
Synthesis and Characterization of Adsorbent Magnetic Kaolin Harlia Harlia; Nelly Wahyuni
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.v15i2.93849

Abstract

Kaolin as an adsorbent has difficulties separating it from the adsorbate solution because it requires centrifugation and precipitation methods, which require significant costs, time, and energy. Modification of kaolin with magnetite was carried out to increase the effectiveness of adsorption from the paracetamol solution. Kaolin-magnetite (KM) adsorbent was made by combining activated kaolin and Fe(III)/Fe(II) solution with a mole ratio of 2:1 using the coprecipitation method. The resulting activated kaolin, magnetite, and kaolin-magnetite were characterized using X-ray Fluorescence (XRF), X-ray Diffractometer (XRD), Fourier Transform Infrared (FTIR), Gas Sorption Analyzer (GSA), and Vibrating Sample Magnetometer (VSM). The presence of magnetite makes it easier to separate KM from the paracetamol solution, with 97.17% of KM being taken by the magnetic rod.
Efficiency And Effectiveness Of Circuit Arrangement And Placement Of Thermoelectric For The Design Of Utilizing Zinc Roof As An Electrical Source Sitti Maryam A. T. Arsyad; Asri Arbie; Abdul Wahidin Nuayi
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.v14i2.86461

Abstract

The problem related to electrical power sources commonly encountered in society is the frequent occurrence of rotating power outages or sudden blackouts, which disrupt activities for both communities and industries as they heavily rely on electrical power to meet their needs, both collectively and individually. In order to meet the needs of society and industry, Indonesia requires a sufficiently large energy supply. One renewable energy source that can be utilized is solar energy due to its easy availability, cleanliness, and cost-effectiveness. In this study, an experimental method is employed, which utilizes the heat from zinc roofs and converts it into electrical energy using thermoelectric generators. Testing is conducted by varying the circuit arrangements, including series, parallel, and combined configurations, as well as the number of thermoelectric modules (20, 30, and 42 modules), and placement locations on zinc roofs and house ceilings, to observe the output results in terms of voltage and electrical current. As observed from the test results presented in the graphs, the output voltage and current vary for each type of circuit. Based on the use of various circuit arrangements, it can be concluded that combining thermoelectric generators results in higher current and voltage values. The greater the number of thermoelectric modules, the larger the output value. There is a difference in output values between placement on zinc roofs and ceilings, with higher output values observed when installed on zinc roofs. This is due to direct contact between the hot side of the thermoelectric generator and the inner part of the zinc roof. All data obtained from these variations depend on the temperature difference between the hot and cold sides of the thermoelectric generator. The greater the temperature difference produced, the larger the voltage and current output from the circuit. This temperature difference affects the overall performance of the circuit.
The Combined Boris-Cyclotronic Integrator for Axially Symmetric Penning Ion Source Simulation Ahsani Hafizhu Shali; Muhamad Rangga Del Piero
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.v15i1.71160

Abstract

An investigation of the use of combined boris-cyclotronic particle integrator scheme for 2D axially symmetric Penning ion source simulation program has been performed. The particle-in-cell based simulation program was intended to be used for Penning ion source optimization. The combination was done by using cyclotronic integrator in cylindrical coordinates while ions were integrated using Boris algorithm (Boris-Cyclotronic scheme). The investigation was centered around the claim that cyclotronic integrator is not limited by gyration period constraints, unlike Boris algorithm. As a benchmark, this scheme is compared against the standard approach in which both species are integrated using the Boris algorithm (All-Boris scheme). The plasma sustainability result shows that for regions where time step width is smaller than the gyration period, Boris-Cyclotronic algorithm is indistinguishable from All-Boris algorithm. For time step width comparable to gyration period, there is an increase in electron production in Boris-Cyclotronic algorithm while All-Boris algorithm remains the same. Single-particle tests show that although the Boris integrator produces noisy trajectories, it maintains a bounded energy error and a consistent average path. In contrast, the cyclotronic integrator produces smoother trajectories but introduces significant oscillatory energy gain, which leads to artificial ionization and exaggerated electron production. These findings indicate that despite its less accurate individual trajectories, the All-Boris scheme provides more physically consistent results for Penning ion source simulation than the Boris–Cyclotronic scheme
Analysis of Land Use Land Cover and Land Surface Temperature in Karst Area: A Case Study Wonogiri Regency Rita Noviani; Aditya Eka Saputra; Pipit Wijayanti; Sorja Koesuma
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 1 (2024): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i1.79048

Abstract

Urban development and global climate change drive increased Land Surface Temperature (LST). Wonogiri Regency is an area that is within the development range of Surakarta City. Analysis of land surface temperature has become Important in Wonogiri Regency as a mitigation measure for urban heat islands. This study aims to measure Land Surface Temperature (LST) in Wonogiri Regency and determine the controlling factor in the form of Land Use Land Cover (LULC), Normalized Difference Vegetation Index (NDVI), seasons, and zones by landform. Using the Google Earth Engine platform, LST calculations, LULC classifications, and NDVI calculations can compute imagery. The dataset used is USGS Landsat 8. The analytical technique used in this study is comparative descriptive, which compares other controlling factors. The analysis results show the vital role of LULC, NDVI, seasonality, and landform on LST. LULC types of built-up land, low NDVI values, dry season, and southern zone (karst) tend to have higher LST than other factors.
Theoretical studies of optically induced high spin polarization and cubic anisotropy in cubic semiconductors M. Idrish Miah
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.v15i1.97373

Abstract

Theoretical studies of optical spin polarization and cubic anisotropy in cubic semiconductors GaAs and GaSb are performed. We use Kane wave functions to calculate the eight-level transition matrix elements permitted by the optical selection rules. It is found that the spin polarization depends on semiconductor, the pumping direction as well as the photon energy. A high spin polarization of about 55% is obtained for GaSb. The anisotropic effect in these cubic crystals is clearly seen. The band edge polarization is found to be flatter and higher for GaAs than that for GaSb. The results are discussed in comparison with the experimental data available in the literature.
Trend Analysis of the Increase of Air Temperature and and the Rainfall on Climate Change in Maros District Sitti Nurhayati Hamzah; Muhammad Arsyad; Pariabti Palloan
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.v14i2.81993

Abstract

Research has been carried out which aims to analyze and gain knowledge about climate change that is happening in Maros Regency using descriptive, spatial and explanatory statistical methods. The data used is daily climatic data for Maros Regency which is processed using Ecxel, RCLIMDEX and ArcGIS 10.4 software which produces data in the form of graphics and spatial images. In addition, global factors are used as supporting data to determine its relationship with the climate of Maros Regency, to see whether climate change is occurring or only being influenced by global factors such as monsoons and El Nino/La Nina. The pattern of rainfall in Maros Regency is monsoonal, there has been no change in climate patterns for 30 years and there has been a decreasing rate of rainfall, but there has been an increase in the amount of rainfall at the peak of the rainy season and a decrease in rainfall at the peak of the dry season every tenth of the year and the extreme index has increased. The air temperature in Maros district is also experiencing an increasing trend, although it is more significant at the minimum temperature.
Monte Carlo Simulation As Precision Predictive Tools to Find Isodose Curve of Gamma Irradiator: A Preliminary Study Bimo Saputro; Adhi Harmoko Saputro; Nunung Nuraeni; Heru Prasetio; Okky Agassy Firmansyah; Fendi nugroho; Hasan Mayditia
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.v14i2.93092

Abstract

Dose distribution mapping is critical for guaranteeing correct sample irradiation, with both experimental and simulation methods playing important roles. Simulations are an effective way to forecast dose distribution patterns, lowering costs and increasing resource utilization. The geometry, source configuration, and measurement locations are fundamental to determine. The gamma irradiator has 48 source areas, each containing two cobalt-60 pencils measuring 8.15 cm, as well as a 4.7 cm stainless steel dummy. Alanine dosimeters were used for dose assessments, and stability varied by less than 1% over six months at 6°C and up to 5% at 50°C. The study's findings revealed a 2.25% disparity in relative dosage between experimental measurements and PHITS models. This result is a major improvement over prior research that found a 10% difference. Furthermore, dosage mapping along the XY and Z axes revealed the most uniform zone on the Z-axis, measuring 7.5 cm to 12.5 cm and with a radius of no more than 5 cm. These findings contribute to our understanding of dose distribution in gamma irradiation and highlight the utility of Monte Carlo simulations for optimizing irradiation operations. The study implies that this model can be used to improve the arrangement of cobalt-60 pencils in the irradiator, improving homogeneity and radiation outcomes.

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