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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 239 Documents
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Theoretical studies of optically induced high spin polarization and cubic anisotropy in cubic semiconductors Miah, M. Idrish
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 Hamzah, Sitti Nurhayati; Arsyad, Muhammad; Palloan, Pariabti
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 Saputro, Bimo; Saputro, Adhi Harmoko; Nuraeni, Nunung; Prasetio, Heru; Firmansyah, Okky Agassy; nugroho, Fendi; Mayditia, Hasan
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.
Development of Ozone Generator Mini with DDBD (Double Dielectric Barrier Discharge) Technology at Atmospheric Air Pressure Sudarmanto, Agus; Yulianto, Eko; Nur, Muhammad
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.v14i1.73660

Abstract

Pesticide residues in fruits and vegetables pose a danger to human health if consumed for a certain period. This requires appropriate technology for household scale and is environmentally friendly. Ozone is a strong oxidizing agent capable of degrading pesticide residues in fruits and vegetables. Ozone is a green chemical compound because it does not produce harmful derivative compounds, and is even friendly to the environment. The development of a mini ozone generator with DBD technology has been successfully carried out. The DDBD reactor is made of Pyrex glass with a length of 10 cm and an outer diameter of 4 cm. The reactor uses electrodes made of copper plates. The outer electrode is 13 cm long and 5 cm wide, while the inner electrode is 10 cm long and 5 cm wide. Optimization of the mini ozone generator is carried out using high voltage AC pulses whose pulse frequency can be varied from 30 to 60 Hz with 10 Hz intervals. The free air flow rate was varied at 0.2 – 0.8 lpm with an interval of 0.2 lpm. The optimum ozone production of 480 mg/l was obtained at a voltage setting of 2.8 kV and a frequency of 50 Hz and a flow rate of 0.2 lpm. In this setting, the DDBD reactor consumes 9.32 watts of power. The development of mini ozone generator technology has the potential to be applied on a household scale because of the small reactor size and low power consumption.  
Real-Time Weigh In Motion (WIM) Monitoring System Based on Optoelectronics and Whatsapp Gateway Hidayah, Fatimah Nur; Jamaldi, Agus; Krisitiawan, Samuel Ardhi
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.v15i1.92986

Abstract

The increasing mobility of motorized vehicles, such as trucks, has positively contributed to regional growth and connectivity in Indonesia. However, this development has also introduced significant challenges, particularly road damage caused by overloaded vehicles. Such damage not only jeopardizes the safety of road users but also incurs substantial economic costs due to infrastructure maintenance and repair. This research utilizes a real-time Weigh-In-Motion (WIM) monitoring system based on optoelectronic technology and a WhatsApp gateway. By combining the precision of optoelectronic sensors with the accessibility of communication through WhatsApp, this system aims to accurately and promptly detect overloaded vehicles. The study focuses on integrating the real-time WIM monitoring system with optoelectronic devices and WhatsApp-based communication. The methodology involves applying varying loads to the fiber optic sensor system, ranging from 1 kg to 10 kg, with loading time variations of 100 ms, 250 ms, 500 ms, 750 ms, and 1000 ms. The programming aspect uses Arduino and Virtual Basic (VB) to support the hardware system for real-time detection by the optoelectronic components. The results demonstrate that the developed fiber optic sensor performs optimally, as evidenced by the data trendline showing alignment at the same point during both ascending and descending conditions. Furthermore, the system successfully provides user notifications via WhatsApp when detecting threshold data at a load of 6 kg crossing the fiber optic sensor system.
Review of Electrical Parameters Influence on Characteristics of Plasma Electrolytic Oxide Coating on Zircaloy Al Afghani, Fajar; Anawati, Anawati
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.v14i2.70654

Abstract

Zircaloy-4 (Zr-4) is used as a fuel cladding material in Pressurized Water Reactor (PWR). Zr-4 as a cladding material works in extreme conditions in pressurized water up to 150 atm at 325 ˚C. In addition, the refuelling process in the reactor requires surface protection of the clay material to minimize corrosion and wear. One of the raising methods to enhance the corrosion resistance of the Zr-4 is by plasma electrolytic oxidation (PEO). Characteristics of the ceramic oxide layer produced by PEO are influenced by current density, type and composition of the electrolyte, and voltage mode. One of the challenges in the PEO development on the Zr-4 substrate is a high porosity with a range of 5%-20% and the low number (below 6%) of t-ZrO2 phases in the inner and outer layers. Optimizing the electrical parameters is necessary to overcome this problem. The results of the literature study show that the cathodic current at the AC voltage plays an important role in determining the resulting plasma characteristics. Low duty cycle (cathodic current> 50%) produce plasma with high density, resulting in a low porosity layer. Oppositely, high duty cycle (cathodic current <50%) produced high content of t-ZrO2 increase the mechanical resistance. Two-step PEO is beneficial in combining the low and high duty cycle to obtain the benefit of each step. 
The Identification of Faults using Magnetic Method in Kulonprogo, Yogyakarta, Indonesia Koesuma, Sorja; Sehah, Sehah; Munandar, Choirul Singgih
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.v14i2.93369

Abstract

The aims of this study to identify faults and identify subsurface lithology using magnetic anomaly data in the Kulonprogo. In the acquisition was carried out using a Proton Procession Magnetometer (PPM) Geotron G5 with 62 measurement points and a distance of ±1 km between point. Measurements were made on Kebobutak (Tmok), Aluvium (Qa), Andesit (a), and Sentolo (Tmps) formations. The total magnetic field data processing is done with several correction, namely diurnal correction, IGRF, reduce to equator, upward continuation at an altitude of 2000 m, and reduce to pole, and 2D modelling using the forward modelling method. The result of the analysis obtained magnetic field anomaly values in the range of values -400 to 950 nT. The 2D modelling shows that the research area is composed of 4 dominating rock types, namely andesite rock with a susceptibility value of 94 x 10-3, andesite breccia rock with a susceptibility value of 29 x 10-3, clay rock with a susceptibility value of 0,013 x 10-3, and sandstone with a susceptibility value of 5 x 10-3. The identification result show the existence of faults line on Mount Watuaglik, Mount Kamal, and Mount Bodag.
Integration of Electrical Resistivity Tomography and Borehole Data for Mapping Laterite-Bedrock Boundaries in a Nickel Deposit, 'PHO' Block, Southeast Sulawesi Pahlawantika, Ipho Amanah; Yatini, Y; Wicaksono, Muhammad Arief
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.v15i1.93950

Abstract

Indonesia has the largest nickel reserves in the world, so proper exploration is crucial to map the potential and utilization of this resource. Exploration of nickel laterite is carried out by mapping the boundaries of the laterite zone and bedrock as a prospect zone for further exploration. One of the methods used is Electrical Resistivity Tomography (ERT) combined with drill data. The principle of the ERT method involves injecting electric current into the ground to measure variations in subsurface resistivity. These variations in resistivity are then used to map the lithological distribution. ERT data, used as the primary data source to obtain an inversion model, is combined with inline borehole data, involving a total of 8 ERT lines and 23 borehole data points. The integration of both ERT and borehole data characterizes zones of nickel laterite and bedrock. Nickel laterite zones consist of saprolite and limonite lithology, and there is a saprock zone as a transition between the nickel laterite zone and the bedrock. Research in the "PHO" Block shows that resistivity values range from 10.9 Ωm to 1500 Ωm, divided into four main zones: saprolite (<150 Ωm), limonite (150 -700 Ωm), saprock (700 -1000 Ωm), and bedrock (>1000 Ωm). The nickel laterite zones are primarily composed of the saprolite with high Ni, high weathering, and porous zone, limonite zones with high FeO2 and low conductive material, and saprock zones that are transition zones of the nickel laterite with low weathering, high fracture, and bedrock. The boundary between the laterite zone and bedrock is predominantly found at depths ranging from 31.1 meters to over 49.9 meters, indicating the presence of bedrock. The limonite zones, which accumulate to more than 20 meters in thickness, are evenly distributed, with lower accumulations in the south and northeast. Thinner saprolite zones were found at depths exceeding 20 meters, while saprock and bedrock were detected starting from a depth of 13.4 meters and extending to over 49.9 meters. The integration of the ERT method and borehole data provides a clearer understanding of the lithologic distribution and the boundary between the laterite and bedrock zones.
Estimate Mass Density Value as A Priori Information for Gravity by using Bayesian Markov Chain Monte Carlo (MCMC) Palupi, Indriati Retno; Raharjo, Wiji
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.v14i2.77622

Abstract

In the gravity method, information about mass density value is very important because it will influence the characteristic of the 1-D gravity acceleration graph. However, it is quite difficult to guess the mass density value so that is suitable to the 1-D acceleration graph. This is called “a priori” information. Trial and error way is one way to solve this problem. It is a very random value guess also. To make sure that the initial guess of mass density is a good parameter, Bayesian Markov Chain Monte Carlo (MCMC) can be used. It generates many possibilities from the guess value and then these possibilities will be selected to the best one by likelihood way. The validation is expressed by the random graph as a consequence of the iteration number step of the possibilities. This research is started by using certain values of mass density to create a synthetic model for the field data in Banggai Sula because the area has a complex geology. The synthetic model is used because the gravity forward modelling equation has the sinusoidal form. After Bayesian MCMC is applied to the initial mass density value, it will produce a new mass density value or the estimation value with its response to the 1-D gravity acceleration synthetic graph. Finally, this information will be very useful to create the 2D or 3D inverse modelling in Gravity.
Synthesis and Characterization of Reduced Graphene Oxide (RGO) as a Solid-State Electrolyte in Batteries Yuningsih, Lela Mukmilah; Anwar, Devi Indah; Fauziah, Eva
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.v15i1.88878

Abstract

Reduced Graphene Oxide (rGO) is a derivative of graphene that has undergone the removal or reduction of its oxygen groups. This study performed the synthesis and characterization of rGO as a solid-state electrolyte in batteries in order to assess the conductivity of rGO and its ability to store electrical currents and voltages. The rGO was synthesized by the Hummers method and the reduction of graphene oxide with a zinc reductor. Graphite oxide was first synthesized by oxidizing graphite with H2SO4 dan KMnO4. This graphite oxide was ultrasonically exfoliated and treated with a Zn reductor to produce rGO in powdered form. The rGO was characterized with Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), an LCR-meter, and a Digital Multimeter. This identified a diffraction pattern in rGO with a 2θ of 25.85° and a d-spacing of 3.444 Å with 48.76 % crystallinity. FTIR observation on rGO exhibited O-H vibrations at a wavelength of 3431.6 cm-1, C=O at 1722.43 cm-1, C=C (1573.91 cm-1), and C-O (1080.14 cm-1). The rGO was observed to have a triple-layered morphology at 10000x magnification. Conductivity for the rGO was identified as 0.000357005 S/cm, while the generated voltage was 1.21 V with a current of 3.55 mA.

Page 23 of 24 | Total Record : 239

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