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Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : https://doi.org/10.23960/jtaf.v14i01
Core Subject : Science, Engineering,
Astronomy Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
We invite authors to submit manuscripts of up to 10 pages, prepared in accordance with the author guidelines. The scope of this journal includes, but is not limited to, the following fields: 1. Theoretical Physics Classical Mechanics Electromagnetics Thermodynamics Statistical Mechanics Quantum Mechanics Theory of Relativity Quantum Gravity Astrophysics Cosmology 2. Earth Physics (Geophysics) Geothermal Geoelectrics Seismics Geomagnetics 3. Materials Physics Nanomaterials Metals and Corrosion Magnetic Materials Thin Films Photocatalysts/Catalysts Semiconductors Superconductors Ceramics Polymers 4. Electronics and Instrumentation Sensors Biomedical Instrumentation Agricultural Instrumentation Environmental Instrumentation Biophysics Computational Physics Lasers 5. Nuclear Physics Reactor Safety Neutronic Analysis Fuel and Waste Management
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 395 Documents
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Analisis Batuan Bawah Permukaan Pantai Kolbano Berdasarkan Data Geolistrik Resistivitas Yanti Boimau; Angelikus Olla; Hilari F. Lipikuni; Wenti M. Maubana; Hery Leo Sianturi
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.385

Abstract

Research has been conducted on mapping subsurface rocks with resistivity geoelectric method at Kolbano Beach. The research aims to map the pattern of rock layers and identify the type of subsurface rock based on the resistivity value and determine the thickness of the rock layers in the study area. Data processing using Res2dinv software. The method used is the schlumberger configuration geoelectric method. The interpretation results show that the rock layer pattern for 4 passes with a track length of 400 meters with variations in resistivity values ranging from 359 Wm -187,433 Wm, 38.5 Wm -8,450 Wm, 133 Wm -17,607 Wm, and 53.7 Wm -63,032 Wm. The identified rocks are aluvium rocks with a resistivity value of 38.5 Wm -800 Wm and limestone rocks with a resistivity value of 801 Wm -187,433 Wm with a thickness of 5.5 m-73.8 m for aluvium rocks and 0 m-73.8 m for gamping rocks, respectively. Based on the rock resistivity value in the research area, the coloured rock which is the mining material in Kolbano Village is classified as an aluvium rock type.   Keywords: Schlumberger, Kolbano, Resistivity, color stone
Pemanfaatan Limbah Pertanian sebagai Material Akustik Ramah Lingkungan Dady sulaiman; Siti Maria Ulva
Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 01 (2025): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v13i01.393

Abstract

Indonesia is an agricultural country, where agriculture as a national income source. Therefore, Indonesia produces a large amount of agricultural waste, that is still underutilised. Agricultural waste can be used in various ways, one of which is as an acoustic material. Acoustic materials can absorb sound and reduce noise pollution. This study aims to determine the factors that affect the sound absorption coefficient of acoustic materials. This study uses the literature review method by taking literature sources from different scientific journals. The literature sources used in this study consist of national and international journals from the last five years (2019–2023). This study refers to previous research data explores natural materials that have the potential to become acoustic materials. Based on the literature review,the natural materials that have the potential to become acoustic materials are sawdust, sugarcane, cassava, and rice husk. These materials can be considered for further research by changing independent variables such as density, thickness, and type of adhesive. In Addition, further research can also combine different materials with other natural fibres. Keywords: natural fibers, waste utilization, agro-waste, acoustic material, sound absorption coefficient.
Interpretasi Data Geomagnet Untuk Menentukan Keberadaan Pipa Air Bawah Permukaan Bumi (Studi Kasus: Lingkungan Masjid Al-Musannif Kampus IV UINSU): (Studi Kasus: Lingkungan Masjid Al-Musannif Kampus IV UINSU) Meilita Rahma; Ratni Sirait; Lailatul Husna Lubis
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.394

Abstract

The existence of subsurface water pipes in the Al-Musannif Mosque environment, Campus IV UINSU, must be established. This is because it is one of the important roles of knowing the location of the pipes in order to reduce engineering accidents and as the accuracy of engineering surveys. This research was conducted using the geomagnetic method, which aims to determine the location of subsurface water pipes and to find out how the subsurface structure in the region is constructed. From this measurement, 43 points were obtained with a distance of 5 to 10 meters and with coordinates from latitude 3°49'56.24 "N and longitude 98°58'72.13" E to latitude 3°49'49.50 "N and 98°58'58.12 "E. The results of this study indicate the presence of anomalous values throughout the study area, exhibiting an elongated shape with a dominant northeast-southwest direction. The values range from 5.6 to 321.1 nT, which is thought to be associated with subsurface pipelines. The 2D modeling results indicate the presence of two anomalies: a high anomaly, which is thought to be a pipe, and a low anomaly, which is suspected to be clay lithology. At high susceptibility contrast values, ranging from 0.2 to 1 SI, with a depth of 2 to 4 m below the surface, it is postulated that these anomalies are associated with metal pipes located in the northwest and southeast. At low susceptibility contrast values, ranging from -1 to -0.2 SI, with a depth of 0 to 20 m below the surface, it is proposed that these anomalies are associated with clay marked with dark blue to light blue color.   Keywords: magnetic field anomalies, geomagnet, subsurface structure, susceptibility
Penggunaan Keping Compact Disc (CD) sebagai Kisi Difraksi untuk Menentukan Indeks Bias Zat Cair Rossy Lydia Ellyana; Sugeng Santoso
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.395

Abstract

Research on the use of compact disc (CD) chips as a diffraction grating to determine the refractive index of liquids aims to determine the value of the refractive index of liquids through the diffraction lattice constants of compact disc (CD) chips, both filled with data and not filled with data. The sample used in this study was pure water (aquadest). The research method begins with making lattice holders, supports, liquid containers and cleaning the CD layer. The lattice constant of the CD is determined by irradiating the CD with an air medium using a laser light source and a dark-bright (diffraction) pattern appears on the screen. Measurement of the distance from the central slag to the light was first measured using a paper scale that had been attached to the screen, then analyzed using a weightless linear regression equation on Microsoft Excel. Measurements were made by varying the lattice distance to the observation screen. The same method is carried out in pure water medium (aquadest). Based on the results of these measurements, the refractive index value of pure water (aquadest) for the red laser pointer on an empty data CD is (1.29 ± 0.04) and on a full data CD is (1.40 ± 0.05). Meanwhile, the refractive index value of pure water (aquadest) for the green laser pointer on an empty data CD is (1.31 ± 0.08) and on a full data CD is (1.38 ± 0.08). Keywords: Diffraction Grating, Compact Disc (CD), Linear Regression, Aquadest Refractive Index.
Karakterisasi Kopi Unggulan Indonesia Jenis Arabika Sangrai Medium To Dark Menggunakan Fourier Transform Infra Red Nurul Mafazi; Zulkarnain Jalil; Elin Yusibani
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.397

Abstract

This research was conducted to determine the chemical characteristics of Arabica Indonesia's coffee beans. Four types of coffee beans are taken as samples, i.e., from Toraja, Wamena, Kintamani, and Flores, then roasted to the medium to dark level around temperatures (213-215)°C within 9-13 minutes. Chemical properties testing in the form of identification of functional groups of coffee beans before and after the roasting process is carried out using FTIR. The results showed that the roasting process affects the functional groups and the appearance of flavor compounds in roasted coffee beans. There is the appearance of ether groups in the 1000-1300 cm-1 spectra region, aromatic acid groups in the 1680-1700 cm-1 spectra region, vinyl and lactone ester groups in the 1762-1780 cm-1 spectra region, 1724-1739 cm-1 aldehyde groups, 1740-1755 cm-1 aliphatic ester groups, 1705-1714 cm-1 aliphatic acid groups, and ketone groups in 1705-1725 cm-1 spectra region. Carbohydrates in the region of 1400-900 cm-1 are seen to have decreased transmittance. Keywords: medium to dark roasting, coffee, FTIR.
Evaluasi Exposure Index (EI) pada Pemeriksaan Radiografi Thorax Posterior-Anterior (PA): Cross-Sectional Study Andhika Rizky Tri Nugraha; Gando Sari; Irsal Muhammad; Eka Putra Syarif H; Nurbaiti
Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 01 (2025): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v13i01.399

Abstract

Chest Posterior-Anterior (PA) radiographic examination is a medical imaging using ionizing radiation to obtain patient diagnostic information. In digital radiographic medical imaging techniques, an indicator shows the radiographic image detector (imaging plate) response to radiation exposure, which is called the exposure index (EI). Therefore, in applying radiation dose optimization in the PA thorax radiographic examination procedure it is necessary to evaluate to determine the indicators of underexposure, optimal exposure, and overexposure exposure. The research method used is quantitative descriptive with cross-sectional study. This research was carried out between March-May 2023 using 70 radiographic examination samples. Then evaluate the percentage of the use of exposure indicators. After that, perform statistical analysis using SPSS IBM25 with Kendall's tau-b test to determine the level of correlation between the use of exposure factors and EI. The results of the study of 70 patients showed an indicator of overexposure of 67% and optimal exposure of 33%. Meanwhile, the results of Kendall's tau-b test showed no correlation between the exposure factor variabel and EI. This shows that using EI as an optimization is not enough to know the exposure factor, but complete radiographic examination procedure data is needed. Keywords: Exposure index, Exposure factor, Chest PA  
Optimalisasi Batu Belah Sebagai Model Tanggul Dalam Upaya Mitigasi Banjir ROB Di Pesisir Pantai Rohamayani Siti; Agus Yulianto; Budi Astuti
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.400

Abstract

Split stone is a type of irregular stone formed from sedimentary rock deposits and sandstone due to weathering and the influence of abrasion in rivers, so split stones are formed. The utilization of split stone as an embankment can be optimized by varying the angle of inclination of the embankment itself. Coastal dikes were built to mitigate tidal floods that occur in coastal areas and cause physical, material, economic and natural losses. Rob flood is a natural disaster characterized by the release of sea water to land. Rob flooding is caused by land subsidence, tidal waves and the absence of wave barriers. From the results of this research, it was found that the dike with the smallest angle is the most optimal embankment if used on the coast, because the more surface area of the embankment that breaks the waves, the less likely the sea waves overflow into land.   Keywords: embankment, split stone, rob flood, coastal.
Pengujian Kualitas Air Kemasan Minieral dengan Pengukuran Indeks Biasa Air Menggunakan Metode Difraksi Fraunhofer Tisar Dewi Pratiwi; Radhitya Perdhana; Mitranikasih Laia; Rohmawati Metaningrum
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.406

Abstract

On a laboratory scale, water quality measurements generally use the degree of acidity (pH) and wather index. This study aims to implement simple physics equations with the tools we make by applying the principle of light diffraction. One of the parameters to determine the level of water quality can be through the measurement of the water index. We use the single-slit Fraunhofer diffraction method to measure the water index in mineral bottled water, including Tripanca, Grand and Aqua. Then the results are compared with the results of measuring the water index in turbid water. The results we obtained showed that Tripanca bottled water was 1.34 ± 0.16, Grand was 1.36 ± 0.39 and Aqua was 1.32 ± 0.51. Turbid water measurements get a water index value of 1.62 ± 0.003. When compared with the laboratory water index value of 1.33, the average bottled water has a water index that is lower than the laboratory water index, and turbid water has a water index that is greater than the laboratory water index. This is because the greater the value of the refractive index of water, it will inhibit light from entering the water medium, thereby reducing the quality of the water.   Keywords: Light diffraction, Refractive index of water, Water Mineral Content, Linear regression.
Cellulose Impact on Bioplastic Performance: A Study on Mechanical Strength, Physical Properties, and Degradation of Water Hyacinth and Kepok Banana Peel-derived Materials Faiza Armalia Putri; Aditya Rianjanu; Wahyu Solafide Sipahutar
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.407

Abstract

Plastics, primarily made of synthetic polymers, are difficult to degrade by microbes, resulting in waste management challenges. Bioplastics are a viable alternative to conventional plastics' environmental problems. They are crucial for circular economy transformation and sustainability goals. To address this issue, researchers investigated the formation of bioplastics from kepok banana peels (Musa acuminata) and water hyacinth (Eichhornia crassipes). This study will investigate the mechanical properties, degradation rate, water absorption, and functional groups of these bioplastics. Various cellulose concentrations (0%, 4%, 8%, 12%, and 16%) are used throughout the manufacture. The results show that cellulose content has a substantial influence on the mechanical characteristics, degradation rate, and water absorption of bioplastics. Bioplastics having 12% cellulose had the best mechanical properties with a tensile strength of 2.551 MPa. Bioplastics containing 4% cellulose, on the other hand, degrade the fastest, losing 63.181% of their mass. This high degradation rate corresponds to the maximum amount of water absorption, which reaches 54.93%. Furthermore, the FTIR study shows that no novel functional groups were discovered in the bioplastics. In conclusion, using kepok banana peel starch and water hyacinth to generate bioplastics shows potential as a solution to the problems that traditional plastics face. This research shows that changing the cellulose content in bioplastics can cause changes in mechanical qualities, breakdown rate, and water absorption. More studies in this area might pave the way for more ecologically friendly and sustainable alternatives to existing plastics. Keywords: Bioplastic, Banana peel starch, Water hyacinth, Cellulose, FTIR  
Sebuah Sistem Pencitraan Optik berbasis pada Proyeksi Pola Titik-titik Acak dengan Metode Digital Image Correlation (DIC) untuk Menentukan Profil Kekasaran Permukaan suatu Bahan Karisna; Margi Sasono; Subhan Zul Ardi
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.408

Abstract

Reliable methods (techniques) are needed to determine surface roughness accurately. Contact techniques are prevalent but can damage materials and are subject to much noise. Meanwhile, non-contact techniques (usually optical) still face setup complexity and inaccuracy. This paper designs a simple optical imaging system based on the projection of random dot patterns to determine the surface roughness of a material. It is technically simple as it only requires a Liquids Crystal Display (LCD) projector device to highlight the random dot pattern onto the surface of the test material and then a digital camera to capture it. The camera captures a reference image (just the random dots pattern) and a distortion image when the random dots pattern highlights the test material. Both images are digitally processed using the Digital Image Correlation (DIC) algorithm to obtain a correlation value proportional to the change in the pattern of random dots due to the presence of the test material surface. This change manifests as a pixel displacement field image estimated to be proportional to the surface roughness profile of the material. Based on this profile, a surface roughness index can be estimated. The validation test results show that the design can determine the roughness index ( of a randomly sprinkled plane surface with different diameters of cork balls (selected). The graph result shows that index  tends to increase linearly with the increase of cork ball diameter with a correlation value of = 0,97. The larger the diameter of the cork ball, the larger the surface roughness index. This result is rational and valid. The design is also verified to determine the roughness index of the surface of commercial sandpaper with various grit sizes. The larger the grit of the sandpaper, the smoother the sandpaper. The verification results show that the design can demonstrate that the larger the grit, the smaller the roughness index of the sandpaper. Thus, the developed optical imaging design is valid and has the potential to be simple, cheap, easy to operate, and fast in obtaining information about the surface roughness of a material.   Keywords: imaging, optical, projection, random-dots, surface-roughness.

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