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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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Design of Resistivity Meter Data Storage System Based on Arduino Mega 2560 Laboratory Scale Measurement Results Dewa Gede Eka Setiawan; Rizky Prayatman; Salmawaty Tansa
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.v14i1.64901

Abstract

A resistivity meter can find out resistivity depth of rock structure, sediment layer, or the depth of water surface. However, the resistivity meter that is often used requires manually recording of the measurement results before inputting them into the processing data software, and this creates many steps in the geoelectric survey. This is because acquiring a resistivity meter with a data storage system entails additional costs, due to its expensive price. Consequently, many of the resistivity meters currently found in laboratories or used in the field are not equipped with a data storage system. This research aims to design a resistivity meter with a data storage system for measurement results, based on Arduino Mega 2560, for laboratory scale. The used sensors were INA219 currents sensor and voltage sensor. In addition, the tests were carried out to determine the level of accuracy of each sensor and testing for data storage system of measurement result. This research employed Schlumberger configuration in the development of resistivity meter. This research has successfully developed a resistivity meter device with a current sensor accuracy level of 97.28% using the INA219 sensor, and a voltage sensor accuracy level of 97.44%. It is noteworthy that the accuracy level is high, and the device is capable of performing readings effectively. This research has successfully designed a resistivity meter which has a measurement data storage.
A Comparison of CNN-based Image Feature Extractors for Weld Defects Classification Tito Wahyu Purnomo; Harun Al Rasyid Ramadhany; Hapsara Hadi Carita Jati; Djati Handoko
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.v14i1.72509

Abstract

Classification of the types of weld defects is one of the stages of evaluating radiographic images, which is an essential step in controlling the quality of welded joints in materials. By automating the weld defects classification based on deep learning and the CNN architecture, it is possible to overcome the limitations of visually or manually evaluating radiographic images. Good accuracy in classification models for weld defects requires the availability of sufficient datasets. In reality, however, the radiographic image dataset accessible to the public is limited and imbalanced between classes. Consequently, simple image cropping and augmentation techniques are implemented during the data preparation stage. To construct a weld defect classification model, we proposed to utilize the transfer learning method by employing a pre-trained CNN architecture as a feature extractor, including DenseNet201, InceptionV3, MobileNetV2, NASNetMobile, ResNet50V2, VGG16, VGG19, and Xception, which are linked to a simple classification model based on multilayer perceptron. The test results indicate that the three best classification models were obtained by using the DenseNet201 feature extractor with a test accuracy value of 100%, followed by ResNet50V2 and InceptionV3 with an accuracy of 99.17%. These outcomes are better compared to state-of-the-art classification models with a maximum of six classes of defects. The research findings may assist radiography experts in evaluating radiographic images more accurately and efficiently.
Kinetics of optical phonons and DP depolarization of spins in drift transport: Hot carrier spin effect in semiconductors M. Idrish Miah
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.v14i2.86965

Abstract

Spin-conserving transport of carriers is an essential requirement for the practical semiconductor-based spintronic devices. Kinetics of optical phonons and Dyakonov-Perel (DP) depolarization of spins in drift transport in semiconductor gallium arsenide (GaAs) is theoretically investigated. We consider electrons in n-type bulk GaAs subjected to a strong electric field, where the electron distribution is assumed to be drifted Maxwellian. The momentum drift of this distribution results in the enhanced drift velocity, and electrons with the corresponding energy emit optical hot phonons in the drifting process. The hot phonons are incorporated via the longitudinal polar optical phonon (POP) mechanism in the momentum relaxation. It is found that a finite phonon lifetime can reduce the momentum relaxation rate, which results in a delay in the runaway to higher fields, where the effect increases with the electron density. The electron spin is found to relax with the DP relaxation frequencies, and the DP spin lifetimes are found to decrease with increasing the drift field. However, a high field completely depolarizes the electron spin due to an increase of the DP spin precession frequency of the hot electrons in the POP scattering process. It is also found that the DP spin precession frequency decreases with decreasing electron temperature or increasing electron density in the moderate range. However, the findings resulting from this investigation demonstrate the hot carrier effect in the spin transport in semiconductors. The results are discussed in comparison with those obtained in earlier experimental and theoretical studies with different approaches.
Adsorption Behavior of Sugarcane Bagasse-Derived Activated Carbon as a Copper Removal Nur Layli Amanah; Alsello Diveni Manuputty; Fadila Arum Ramadhani; Dita Floresyona; Eduardus Budi Nursanto; Haryo Satriya Oktaviano; Agung Nugroho
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.v15i1.87564

Abstract

This study aims to remove Cu2+ as a heavy metal inside the sample solution implementation. Eliminating heavy metals through activated carbon utilizes sugarcane bagasse's high carbon content, which is rich in cellulose, lignin, and hemicellulose. There are various methods for eliminating metal content, including activation using Acid 0.1 M Hydrochloric Acid (HCl),  Base 0.1 M Sodium Hydroxide (NaOH), and without using activation media. The method considers the different ion Cu2+ initial concentrations and contact times. Detailed initial concentrations of Cu2+ were conducted using CuSO4 media for 2.5, 5, 10, and 15 ppm and 15, 30, 60, and 120 minutes for length of contact time. For the result, the transmittance of FTIR showed a primary functional group of Activated Carbon (AC) on SBAC-1, comprising O-H, C-O, and C=O. The Brunauer-Emmett-Teller (BET) analysis also shows the significant value reaching 458.607 m2/g surface area's adsorption and had qmax = 8.13 mg/g, the highest adsorption capacity. The plot brings about the adsorption mechanism as physiochemical & multilayer adsorption, with a physisorption layer with percent removal of Cu2+ at 81.3% at 30 minutes optimum time and optimum initial concentration of 5 mg/L with 82.2 % absorption on SBAC-1. The determination of Freundlich as the isotherm model is the most suitable mechanism of absorption for all process variations and generates a R2 value of 0.9731 for the SBAC-1 sample.
Gravity Interpretation of Mud Volcano based on Satellite Data (Study Case Kuwu and Cangkring Mud Volcano) Rina Dwi Indriana; Mariyanto Mariyanto; Eleonora Agustin; Mimin Iryanti; Cahyo Aji Hapsoro; Sorja Koesuma; Abdul Latif Ashadi
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.v14i1.84933

Abstract

A mud volcano is one type of mountain in the world. Mud volcano has specific characteristics. In Java, several mud volcanoes spread from west to east of Java. Bledug Kuwu and Bledug Cangkring are mud volcanoes in Central Java. Research on the Bledug Kuwu and Cangkring mud volcanoes systems was not done. In this preliminary study, the gravitational field analysis of the Kuwu-Cangkring mud volcano system was done by using GGmPlus satellite data with a 220 m grid and elevation data using ERTM. Free air anomaly data processing obtained a complete Bouguer anomaly value of 23 to 34 mGal. The separation process of anomalies using the upward continuation method produces a local of -0.5 to 0.5 mGal and a regional of 23 mGal to 34 mGal. The local anomaly value of Bledug Kuwu was -0.275 to - 0.05 mGal and Bledug Cangkring-0.125 to 0.1 mGal. The local anomaly around Bledug Cangkring is higher than Bledug Kuwu, indicating a lower density beneath Bledug Kuwu than in Cangkring.
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.
Role of the Nuclear Technology for Regional Border Security Darsono Darsono; Elin Nuraini; Saefurrochman Saefurrochman; Sutadi Sutadi
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.v15i1.75274

Abstract

The smuggling of explosives, narcotics, weapons, and hazardous chemicals, as well as the illicit trafficking of radioactive and nuclear materials across the national border have threaten the security of all States. Nuclear technology has been developed to face these problems. Current inspection system for parcel, luggage, vehicle, and cargo uses imaging techniques based on the penetrating radiation of hard X-rays and Gamma-rays. These system are used to prevent the smuggling activity. RPM (Radiation Portal Monitor) is used to detect radioactive and nuclear materials. This paper describes the RPM, the cargo inspection system based on the penetrating high energy photon and neutron, as well as the potential cargo inspection system based on neutron reaction with materials inside a container. The discussions are focused on the research and development of the PGFNA (Prompt Gamma Fast Neutron Analysis) with associate particle method in BRIN (National Research and Innovation Agency) to detect C, N, and O which are the main chemical element of a contraband material. A neutron of 14.1 MeV from a neutron generator accelerator was used to excite the nuclides of C, N, and O and their gamma rays were measured by nuclear instrument of alpha-gamma coincident.  The results of PGFNA experiments using the alpha-gamma coincidence technique at 100 ns timing range of TPHC and at a neutron flux of 106 n /cm2.s showed that the technique worked and it was able to reduce the background count although a big sample was needed.
Development of Fiber Optic Sensor-Based Weight-In-Motion System For Bridge Applications Fatimah Nur Hidayah; Nugroho Tri Atmoko
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.v14i1.79525

Abstract

Vehicles loaded with Over Dimension Overload (ODOL) cause damage to road infrastructure, traffic accidents, and endanger crossing transportation. ODOL vehicles also contribute to the death of people. This research focuses on characterizing the effect of moving loads on fiber optic light loss. Problem-solving approach through the optical fiber macrobending method. This research aims to be implemented in the WIM system concept. Macrobending comes from the weights contained in the body dump. The types of loading carried out are static and dynamic. Under dynamic loading, the speed variation is 0.1 m/s, 0.2m/s, and 0.3 m/s. The research results show that the greater the loading value, the greater the attenuation value of the optical fiber. This research applies to all three speed variations of the dummy dump truck, both front and rear wheels. Apart from that, the best sensitivity value is found at a speed variation of 0.1 m/s. The value is 2.029. This data can be used as a reference for the most recommended speed when a loaded vehicle passes through a fiber optic sensor-based WIM system.
Propose Model of Gathering System Optimization on Unit-G4 Geothermal Power Plant Udi Harmoko; Sorja Koesuma; Joko Windarto; Asep Yusup Burhanudin
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.v15i1.100269

Abstract

The nature of geothermal heat is a decrease in pressure, temperature, and steam flow. Based on Exaquantum observation data, one of the geothermal power plants in West Java experienced a reduced steam supply for the Geothermal Power plant (GPP) Unit-G4, which decreased production capacity. This study aims to analyze the existing conditions and make models and simulations on the optimum Steam Gathering System (SGS) at GPP Unit-G4.  The stages in this research are modelling using Aspen Hysys software on the existing conditions of SGS as a basis for finding alternative optimum solutions. The second stage was to design a model and simulation by interconnecting the K-21X production well with the PL-X05 production.  Furthermore, the simulation of adding steam by 25%, 50%, 75%, and 100% in the interconnection process was carried out. Existing steam gathering modelling and simulation results show that the deviation between actual steam field parameters is ≤ 2% (can be used as a simulation baseline). The modelling and simulation results of adding steam from the K-21X production well to the PL-X05 production well are optimum at 100% and 75% steam addition. From the simulation, adding 25% and 50% steam cannot be applied because the net power does not reach the unit rate capacity of 60.856 MW.

Page 28 of 36 | Total Record : 351

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