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INDONESIA
Indonesian Physical Review
Published by Universitas Mataram
ISSN : 26151278     EISSN : 26147904     DOI : -
Core Subject : Science, Education,
Education Physics
Indonesian Physical Review is a peer review journal which is managed and published by Physics Departement, Faculty of Mathematics and Natural Sciences, Universitas Mataram. This journal is published periodically three times a year, in January, May and September. IPR is Open Accsess for all readers and includes research developments in physics both experimentally and analytically. Focus and scope include Theoritical Physics, Computation, Material sciences, Instrumentation, Biophysics, Geophysics, and Optics.
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Articles 221 Documents
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STUDY OF VOLTAGE AND ELECTRIC CURRENT GENERATED FROM CU-ZN ELECTRODES IN A MEDIUM OF SAWDUST AND COAL STOCKPILE WASTEWATER. Setiawan, Andi Arif; Rahman, Dui Yanto; Sulistyowati, Rita; Midia, Kiki Risky; Rusly, Muhammad
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.245

Abstract

Industrialization has positive effects on the economy, but on the other hand, it also adversely impacts the environment and energy needs. This phenomenon needs to be solved in an integrated way, including using wastewater from coal stocks and sawdust as electrolyte media to generate electrical energy. This study aims to analyze the voltage and electric current generated by electrode pairs consisting of copper (Cu) and zinc (Zn) immersed in different sawdust media denoted as M1 (2 grams), M2 (4 grams), M3 (6 grams), and M4 (8 grams), dissolved in 100 milliliters of coal stockpile wastewater. Additionally, the study explores the effects of varying the distance between the Cu-Zn electrodes at 1, 2, and 3 cm. The results showed that the highest voltage generated from the combination of coal stockpile wastewater and sawdust was highest in M3 (6 grams of sawdust + 100 ml of coal stockpile wastewater at a distance of 1 cm at 0.736 volts. The highest electrical current generated by the Cu-Zn electrode in the M3 media combination was 0.221 mA. It is due to coal stockpile wastewater in M3 sawdust powder, which contains ions that enhance electron conduction compared to M4.
MICROZONATION ANALYSIS IN MANNA CITY & PASAR MANNA SUBDISTRICTS UTILIZING MICROTREMOR DATA, SOUTH BENGKULU REGENCY Refrizon, Refrizon; Fadli, Darmawan Ikhlas; Triutami, Olga; Putri, Aisyah Cindy Phylia; Rahmawati, Nurul Ilmi
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.252

Abstract

South Bengkulu is prone to earthquakes because it is located on the Great Sumatran Fault. Apart from that, it is also influenced by the activity of the Musi and Manna segments, so that besides being influenced by the two active tectonic plates it is also influenced by the local segment. This research is located in Manna City and Manna Market, which is mostly inhabited by people and is the capital of South Bengkulu. In connection with infrastructure development, it is necessary to know the condition of the soil layers to minimize the risk of building damage due to earthquakes. This research aims to analyze earthquake-prone areas based on dominant frequency parameters, soil amplification, seismic vulnerability index and sediment layer thickness (h). Research data comes from microtremor measurements at 60 measuring station points in Manna City and Manna Market. The tool used is a Short Period Portable Seismometer Model Gemini 2 SN-1405. This microtremor data is processed using the Horizontal to Vertical Spectral Ratio (HVSR) method. The results of data processing show that the research area has the lowest dominant frequency of 3.95 Hz and the highest of 49.71 Hz. The ground vibration amplification value is classified as small to medium, the lowest is 1.3 and the highest is 5.19. The lowest earthquake vulnerability index was 0.18 cm2/s and the highest was 2.24 cm2/s. The smallest sediment thickness was 3.77 meters and the thickest was 47.48 meters. From the results of the calculation of the seismic vulnerability index in Kota Manna and Pasar Manna Districts, the seismic vulnerability index value is relatively small, in accordance with the amplification factor and the thickness of the sediment layer. Based on this research, although Manna City and Manna Market are often shaken by earthquakes, the earthquake vibrations experience small amplification.
EFFECT OF SILICON RUBBER (SIR) IN FABRICATION OF NdFeB/BaFe12O19-BASED HYBRID MAGNET Ramlan, Ramlan; Soerya, Balada; Fachredzy, Amdy; Naibaho, Marzuki; Ginting, Masno
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.258

Abstract

The purpose of this study was to determine the effect of physical properties (density), magnetic properties (magnetic flux), and mechanical properties (tensile strength) of NdFeB- BaFe12O19 hybrid magnets with silicon rubber adhesive. NdFeB - BaFe12O19 permanent magnet has been made with a silicon rubber (SIR) adhesive mixture. The percentage variations of magnetic powder materials used are NdFeB: BaFe12O19 (95%: 5%) and NdFeB: BaFe12O19 (90%: 10%) mixed with a weight percentage of silicone rubber with variations of 20%, 40%, 60% and 80%. Characterization includes physical properties in the form of density where the sample with 20% SIR variation has the largest bulk density value of 3.28 g/cm3 for NdFeB: BaFe12O19 (95%: 5%) and 3.24 g/cm3 for NdFeB: BaFe12O19 (90%: 10%), and mechanical properties in the form of tensile strength where the most optimum elasticity value is at 80% silicone rubber. Meanwhile, the most optimum magnetic properties of materials are owned by material samples with variations of SIR at a concentration of 20% for sample variations of 95% NdFeB and 5% BaFe12O19, which is 602.8 Gauss.
PROVENANCE ANALYSIS OF THE RAMPONG FORMATION SANDSTONE IN THE KETUKAH AREA, GAYO LUES, ACEH Sartika, Dewi; Gunarsih, Dina; Ahmad, Luthfi; Muhni, Akmal; Rahmatillah, Lia Fitria; Adhari, Muhammad Ridha
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.261

Abstract

The research location is in Ketukah, Gayo Lues Aceh, which is composed of the Late Oligocene to Early Miocene Rampong Formation. Lithology includes sandstones, conglomerates, and mudstones. The study aims to determine the origin of the sandstones in the Rampong Formation. Provenance studies are beneficial in providing information for oil and gas exploration. The analysis is critical for understanding the sediment transport channel, the overall depositional pattern of the basin, and predicting the location of sand bodies in the basin. Because the Rampong Formation is located in the North Sumatra Basin, the availability of provenance information is useful in efforts to search for oil and gas potential in the future. In this research, we restrict the study to the provenance, which includes the tectonic setting, origin rock, and paleoclimate where these sandstones originate. The methods are geological mapping and petrographic analysis. In petrographic analysis, we use JMicrovision to calculate mineral composition. The results showed that the sandstones of the Rampong Formation are arenite sandstones, especially sub-arkosic and sub-lith arenite. They originate from a tectonic setting known as a recycled orogen, related to the subduction of Eurasia and the Indo-Australian plates.  The sandstones were formed from granite that had undergone low metamorphism in the Late Cretaceous to the Eocene period. In addition, the paleoclimate is humid.
IMPROVED SEISMIC IMAGING THROUGH PETROPHYSICAL APPROACH USING THOMSEN'S PARAMETER ESTIMATION IN ANISOTROPIC PRESTACK DEPTH MIGRATION (PSDM) Minarto, Eko; Fahmi, Muhammad; Putra, Ginanjar Satria
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.262

Abstract

Research has been carried out using the Prestack Depth Migration (PSDM) anisotropy method for 2D reflection seismic data. This research aims to estimate anisotropic parameter values with a petrophysical approach to the Prestack Depth Migration method to obtain better imaging results. The type of anisotropic medium used is Vertical Transverse Isotropy (VTI) because that can explain the effect of anisotropy in a simple form on the sediment layer. In theory, 2 parameters are needed to describe this parameter, namely ε and δ. δ is an anisotropic parameter that describes the velocity variation towards a nearly vertical direction and is the control depth of seismic. In contrast, ε describes the velocity variation towards the near horizontal direction. The stages of data processing are divided into two; the first is PSDM isotropy, which flattens gather at near offset (angle mute <30 degrees), and PSDM anisotropy to flatten-gather at far offset (mute angle> 30 degrees). The results of this study showed that the relation of ε and δ in shale formations was (δ = 0.4958ε - 0.0152) and sand formation (δ = 0.9082ε - 0.0203) and the range of anisotropic parameters δ and ε were -0.02 up to 0.13 and 0 up to 0.3. From all ranges of anisotropic parameter values, this study belongs to the "weak anisotropy" category Thomsen (0 to 0.5). The value of anisotropy parameters obtained can give the results of seismic images more accurately and clearly than PSDM isotropy. It can correct errors in the depth of seismic up to 51 m.
IMPACT OF TROPICAL CYCLONE SEROJA ON RAINFALL AND WIND SPEED IN EAST NUSA TENGGARA PROVINCE Kaha, Astried Valentine; Baskoro, Winardi Tjahyo; Sumaja, Kadek; Sukarasa, I Ketut; Paramarta, Ida Bagus Alit; Sandi, I Nengah
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.264

Abstract

Tropical cyclone phenomenon can give impacts such as heavy rain, strong winds, and high waves around its growth area. One of the tropical cyclones that has occurred is Seroja Tropical Cyclone which formed in the Sawu Sea on April 3, 2021. Therefore, this study aims to determine the effect of Seroja Tropical Cyclone on rainfall and surface wind speed in East Nusa Tenggara Province and the percentage comparison of rainfall and wind speed during the Seroja tropical cyclone event with the normal value of rainfall and surface wind speed over a 10-year period. The data used are daily rainfall and surface wind speed data during the Seroja tropical cyclone event, namely April 3 to 12, 2021 and daily average rainfall and wind speed data in April for 10 years in several affected districts in East Nusa Tenggara Province. Data processing is done by calculating the percentage comparison of rainfall and wind speed during the Seroja Tropical Cyclone event with normal rainfall and wind speed in several regions in East Nusa Tenggara. Based on the analysis, heavy to extreme rainfall and strong winds were found in several districts at a radius of about 400 km from the center of the cyclone. Although the category of this tropical cyclone is low, it is able to give impacts in the form of heavy to extreme rainfall and strong winds in the surrounding area. So it can be concluded that the tropical cyclone category does not directly affect rainfall and wind speed in an area, but the distance between the area and the center of the tropical cyclone is more influential in increasing rainfall and wind speed in an area. This is also proven by Sumaja's research in the case of tropical cyclones LUA and Narelle.
IMPEDANCE ANALYSIS FOR FOUR TYPES OF MINERAL WATER AND AQUADES USING ELECTRICAL IMPEDANCE SPECTROSCOPY (EIS) AT FREQUENCIES OF 1 Hz - 50 kHz Wulandari, Darmawati; Zarkasi, Ahmad; Nurhanafi, Kholis
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.269

Abstract

The Electrical Impedance Spectroscopy (EIS) method can be used to identify minerals in mineral water. The EIS method measures the impedance of a material by injecting alternating current in a certain frequency range, which is non-invasive and non-destructive. This study aims to analyze the impedance of mineral water and aquades based on the influence of the dissolved content using EIS equipment that provides flexibility in adjusting the desired frequency spectrum. The study used a frequency range from 1 Hz to 50 kHz with a four-electrode configuration. The measurement graph results were analyzed using Bode graph with impedance plot and phase shift angle to determine the impedance characteristics of mineral water. Equivalent circuit modeling helped to identify the electrochemical properties of materials such as the Warburg circuit, Constant Phase Element (CPE), and Randles circuit. The results show that the aquades has a higher impedance compared to the four mineral waters. Additionally, the four mineral waters exhibit varying impedances, attributed to their respective mineral content. Mineral water is characterized by an impedance that is dominated by Warburg impedance (Zw) at low frequencies, charge transfer resistance (Rct) and double layer capacitance (Cdl) at middle frequencies, and electrolyte resistance at high frequencies. However, the impedance of aquades dominated by electrolyte resistance (Re) at low frequency and Re+Rct at high frequency.
EFFECT OF FE3O4/SIO2/TIO2 PHOTOCATALYST ON POLLUTANT MANAGEMENT IN SWAMP WATER Liasari, Beta Riana; Arsyad, Fitri Suryani; Assaidah, Assaidah; Ramlan, Ramlan; Nur’aini, Siti; Soerya, Balada
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.271

Abstract

Water is an essential source of life, thus regulating its purity is critical in daily living. Water has a high acid content (pH) and contains a variety of harmful chemical elements such as iron (Fe), copper (Cu), sulphate (SO4), nitrate (NO3), chloride (Cl), and other dangerous bacteria. The goal of this research is to create wastewater management such that it can be used by the community. The process involves creating Fe3O4 catalysts that have been modified using SiO2 and TiO2. The application of dirty water employs Fe3O4/SiO2/TiO2 to bind contaminants in polluted water. The results of the photocatalyst process carried out by Fe3O4/SiO2/TiO2 reach 90% in 180 minutes of UV light irritation so that it can degrade water pollutants such as methylene orange.
ANALYSIS OF HYDROXYAPATITE/GELATINE COMPOSITION ON THE FILAMENT FORMATION USING PISTON EXTRUSION METHOD Tandanu, Yoga A; Santjojo, Dionysius J D H; Masruroh, Masruroh
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.273

Abstract

HA/Gelatine bio composite is the main material in making scaffolds that have the advantage of biocompatibility and high biodegradability. One method of making scaffolds is using piston extrusion 3D printing technology, which is compatible with several types of materials, especially HA/gelatine biocomposites. This study aims to determine the effect of HA/gelatine bio composite composition on the filament formation process which is influenced by the rheological properties of the material. The filament extrusion process is influenced by rheological properties in the form of viscosity. The synthesized HA material was then dissolved with gelatin in the ratio of 1:2, 1:3, 1:4, 1:5, and 1:6 homogeneously. After that, viscosity measurements were made on each variation of HA/gelatine composition with a viscometer. The biocomposite solution that has been mixed homogeneously is then extracted until it comes out of the nozzle. Meanwhile, the viscosity of the HA/gelatine bio composite solution when given piston pressure can be known through the calculation process. The viscosity test results show that there is a change in the viscosity of the solution. This is caused by the shear-thickening phenomenon due to the application of pressure on the fluid. Based on the experimental results, the extrusion results still do not form filaments, which indicates that the rheological properties of the HA/gelatine bio composite solution are still too liquid so other material modifications are needed. The extrusion speed of 0.42 mm/s used in this study is too fast for the HA/gelatin material solution, so it has not formed optimal filaments.
SYNTHESIS OF NANO-SILICA FROM LOA KULU RICE HUSK USING THE SOL-GEL METHOD Shoodiqin, Dian Mart; Musyarofah, Musyarofah; Robiandi, Fadli; Chairunnisa, Regita Cahya
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.280

Abstract

Silica is a material that is widely found in nature and is able to withstand corrosion attacks from corrosive environments. However, this natural material must be extracted to obtain high purity silica. Simple sol-gel method is used to solve the extraction problem (nano-silica with high purity). The natural materials used in this research come from organic materials, namely rice husks from the local area (Loa Kulu area). The main objective of this experiment is studying the effect concentration of HCl for crystalline size.  The synthesis of silica was carried out with the preparation of ashes, then mixed with NaOH 7M until a solution of sodium silicate was produced. Silicate sodium solution was pressed with HCl 2M to form a silica gel with pH 7, 5, and 3 then was dried to produce silica powder. Silica powder was then burned at a temperature of 1000°C to produce silica with a crystalline phase. Based on the experiment, silica powder before calcination has amorphous phase and at any pH variation, the crystallite size calculated with the Debye Scherrer approach does not show any change the crystallite size by the variation of the silica gel’s pH. In addition, silica powder calcinated at 1000°C has amorphous and cristobalite phases and showed changes in crystal size after calculated with Debye Scherrer’s approach.

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