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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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Identifikasi Sebaran dan Jenis Sesar Lokal di Sekitar Sesar Waipoga Dengan Analisis Anomali Gravitasi Hafidz Syarifuddin; Mahmud Yusuf
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.v12i02.409

Abstract

Nabire Regency is located on the bird's neck of the island of Papua with a history of high seismicity. The Waipoga fault as a major fault was recorded to have caused the Nabire earthquake on November 26, 2004 with a magnitude of 7.2 Mw. Around the Waipoga fault there are small faults that are suspected to be faults. This research aims to identify the presence of suspected faults around the Waipoga Fault using the gravity method. The gravity data uses GGMPlus global satellite data in combination with topographic data from DEMNAS. The research uses surfer software to display the distribution of simple bouger anomalies, residual regional anomalies, and derivative analysis. The anomaly value obtained shows that the Nabire Regency area is predominantly composed of hard rock with a density of 2.7187 grams / cm3. The high density of subsurface constituent rocks results in a dominant positive simple bouger anomaly (SBA) value, with a value range between -10 mGal to 95 mGal. From the results of the FHD (Firts Horizontal Derivative) and SVD (Second Vertical Derivative) analysis, it shows a clear density contact boundary so that the fault line can be drawn in two segments. Fault segment A has a northeast-southwest (NE-SW) orientation with a rising fault mechanism. Segment B shows a descending fault that has a meandering shape towards the northwest-southeast (NW-SE).   Keywords: Gravity anomaly, FHD, SVD, Waipoga Fault
Efek Penambahan Variasi Larutan Ion Ag+ dalam Pembuatan Kertas Antibakteri Berbasis Pulp Selulosa dari Kulit Kopi Sutiarno sutiarno; Muhammad Jundy Al Faruq; Fakhri Izdihar Prayitno Putra; Chayyara Igda Prameswari; Azizah Azmi Nurohmah; Kinasih Cahyono; Fatkhur Rohman; Gurum Ahmad Pauzi
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.v12i02.411

Abstract

Coffee skin contains cellulose, reaching 49%, so the material has the potential to be used as a substitute for the main material of wood in the paper industry. To obtain pure cellulose coffee skin, the lignin delignification process was carried out using 15% NaOH. Then, it was bleached by adding 10% H2O2. The bleached precipitate was washed to a neutral pH and dried. Coffe Skin Cellulose mixed with sago starch as an adhesive was weighed in a ratio of 1:3. To improve the quality of the paper, the material was mixed with a solution of Ag+ ions in a ratio of 2:1 to form pulp.The process of making an Ag+ ion solution involves forming two AgBr plates into electrodes with a distance of 1 cm in 400 ml of aquades. The electrolysis stage used V = 25 volts by checking the concentration of the solution using a TDS meter every 10 minutes. Then, the electrolysis solution underwent four variations in concentration, namely 18, 21, 24, and 27 ppm. Next, the paper is printed and dried using sunlight. This study reviewed the effect of variations in the concentration of Ag+ ion solutions coated on paper on functional groups and antibacterial properties. The results of UV-Vis analysis revealed Ag+ ions in the wavelength range of 400–439 nm. As the concentration increases, so does the absorbance peak. Then, functional group analysis indicated a shift in the absorption band peak of the N-H bending group due to reduced binding by Ag+ ions. In the results of bacterial testing, all samples had clear zone values, with an average diameter of Bacillus sp. 3.7 mm and Escherichia coli 4.65 mm. The ability of paper samples to inhibit bacteria was still weak. Keywords: Paper, Ag+ ions, Cellulose, coffee skin, antibacterial.
Perancangan dan Pembuatan Plasma Blood Separator Berbasis Arduino Uno Patrisius Kusi Olla; Bayu Wahyudi; Muhammad Nur Alfian; Diah Rahayuningtyas; Mohammad Rofi'i
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.v13i01.412

Abstract

This research aims to design a Plasma Blood Separator that can separate plasma from red blood cells automatical-ly using an Optocoupler sensor and a specimen tube cutter. This sistem is equipped with an Arduino Uno as the con-trolling brain, a servo motor to clamp the hose, a DC motor to open the blood bag pressure, a series of push buttons to open the servo, and a buzzer to indicate the completion of separation. After testing the Arduino Uno-based Plasma Blood Separator, all functions can work well by showing results in three trials varying the length of the tube. The var-ied hose lengths are 38 cm, 52 cm, 71 cm. The estimated separation times are 1.16 minutes, 2.17 minutes and 3.4 minutes. In the voltage measurement results, the measurement results were obtained with a small percentage of error with a value of <5% and a high accuracy value with a value of >90%. Keywords: plasma blood, separator, arduino
Rancang Bangun Mesin CNC Laser 4 Axis menggunakan Motor Stepper Tipe Nema 23 Terintergrasi Mach3 USB untuk Aplikasi Mesin Cutting Otomatis Hesti Wahyu Handani; Sri Ratna Sulistiyanti; Yanti Yulianti; Posman Manurung; Junaidi
Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 02 (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.v13i02.413

Abstract

Perancangan dan pembuatan mesin CNC Laser 4 Axis menggunakan motor stepper tipe nema 23 terintegrasi Mach3 USB untuk aplikasi mesin cutting otomatis telah dilakukan. Alat ini merupakan suatu alat laboratorium bidang manufaktur yang digunakan untuk memotong material berbahan akrilik secara otomatis dengan dimensi pemotongan mencapai 1000 mm x 2000 mm. Alat ini memiliki mata potong berupa laser dioda ukuran 40 watt yang mampu memotong lembaran akrilik dengan ketebalan 3 mm. Alat ini dikontrol menggunakan kontroler Mach3 board dan dikomunikasikan dengan software Mach3 menggunakan perintah berupa G-code. Alat ini mampu memotong lembaran akrilik ketebalan 3 mm dengan kecepatan maksimum 55 mm/menit. Untuk hasil pemotongan optimal, proses pemotongan akrilik dilakukan pada jarak laser terhadap akrilik yaitu sejauh 15 mm. Alat ini memiliki kesalahan relatif yaitu 0,27% dan deviasi sebesar 0,25 mm. Berdasarkan spesifikasi tersebut, mesin CNC Laser ini dapat diaplikasikan untuk mesin cutting otomatis untuk material berbahan dasar akrilik.
Analisis Tumbukan Fisika pada Tabrakan Mobil Menggunakan Software BeamNG.drive Fachri Ramdhan; Ahmad Faizal Yus'an; Bayu Setiaji
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.v13i01.420

Abstract

This study aims to examine the phenomenon of collision between two vehicles by observing the changes in momentum, kinetic energy, and vehicle deformation as a response to the collision, as well as evaluating the accuracy of the simulation using BeamNG.drive software by comparing it to the applicable physical theories in collisions. The research method used is experimental by conducting collision simulations using BeamNG.drive software. The initial velocity variations of the colliding vehicle (car A) are set at 50, 75, and 100 km/h, while the struck vehicle (car B) is in a stationary condition. The analysis is carried out by calculating the conservation of momentum, kinetic energy, and the coefficient of restitution of the collision. The results show that the initial and final momentum values of the system are almost the same, in accordance with the principle of conservation of momentum. However, there is a significant decrease in kinetic energy values, indicating an inelastic collision where kinetic energy is transformed into deformation energy. The very low coefficient of restitution values (approaching 0) also confirm the nature of the inelastic collision. The simulation results using BeamNG.drive are consistent with the relevant physical theories on collisions, demonstrating the accuracy of the software in modeling vehicle collision phenomena. Keywords: collision, momentum conservation, kinetic energy, coefficient of restitution, Beam.  
Studi Perbandingan Data Curah Hujan antara Empat Jenis Citra Satelit dan Pengukuran Lapangan di Daerah Bengkulu Viona Azhari Priscilla; ashar muda lubis; Ella Warahma; Arya J Akbar; Lizalidiawati
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.v13i01.425

Abstract

Bengkulu Province is one of the provinces with high rainfall. High rainfall intensity has a negative impact on various sectors. Therefore, it is necessary to have information regarding accurate rainfall data. Currently there are many satellites that can be used to obtain rain data, this remote sensing technology offers an excellent complement. This research aims to identify comparisons/comparison of rainfall data between various satellite images and field measurements in Bengkulu. The coefficient of determination test was carried out to obtain a correlation between satellite rainfall and direct measurements. Data accuracy analysis shows the correlation results of monthly rainfall from four types of satellite images at 4 observation points in the Bengkulu area. Based on data in the cities of Bengkulu, Kepahiang and Taba Penanjung, it can be seen that the satellite that has the best correlation is the GPM IMERG satellite. For Bengkulu City it was 72.64%, Kepahiang was 74.34% and Taba Penanjung was 56.47%. In the Bukit Kaba area, the best correlation results are on the CHIRPS satellite with a correlation of 15.58%. From the results obtained, we conclude that satellites that can be used by the public and researchers in rainfall analysis are good using GPM IMERG satellite data as a substitute for BMKG data. Keywords: Rainfall, Satellite, correlation.
Generator Set Uji Untuk Diagnosis Kesalahan pada Rangkaian Digital Kombinasional Demultiplexer 1 line to 4 line Menggunakan Metode Tabel Kesalahan Denny Pratama; Ageng Sadnowo Repelianto; Sri Purwiyanti
Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 02 (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.v13i02.426

Abstract

Abstract. A small error in the IC can become a big problem if it is not detected and used by the user. Therefore, a fault diagnosis method is needed to ensure the IC functions properly. The method used must be fast and efficient in checking the IC. One method that can be used is designing a test set generator based on the diagnostic tree principle with the error table method. The implementation of the 74ACT139 dual 1 line to 4 line demultiplexer system in this research shows that this method is effective for fault diagnosis. As a result, all stuck logic damage can be detected with an average efficiency of 93.01%. The longest test of 16 times shows an efficiency of 87.5% at f0 and f15, while the shortest test of 1 time shows an efficiency of 99.21% at f1. Keywords: Fault diagnosis, test set generator, fault table, diagnostic tree, demultiplexer, efficiency Abstrak. Kesalahan kecil pada IC bisa menjadi masalah besar jika tidak terdeteksi dan digunakan oleh pengguna. Oleh karena itu, diperlukan metode diagnosis kesalahan untuk memastikan IC berfungsi dengan baik. Metode yang digunakan harus cepat dan efisien dalam memeriksa IC. Salah satu metode yang dapat digunakan adalah perancangan generator set uji berdasarkan prinsip pohon diagnosa dengan metode tabel kesalahan. Implementasi pada sistem demultiplexer dual 1 line to 4 line 74ACT139 dalam penelitian ini menunjukkan bahwa metode tersebut efektif untuk diagnosis kesalahan. Hasilnya, seluruh kerusakan stuck logika dapat terdeteksi dengan rata-rata efisiensi 93,01%. Pengujian terpanjang sebanyak 16 kali menunjukkan efisiensi 87,5% pada f0 dan f15, sedangkan pengujian terpendek sebanyak 1 kali menunjukkan efisiensi 99,21% pada f1. Kata kunci: Diagnosis kesalahan, generator set uji, pohon diagnosa, demultiplexer, efisiensi
Analisis Pengaruh Jarak Elektrode terhadap Kinerja Sensor IDE Berlapis Grafit untuk Mengukur Suhu Doni Bowo Nugroho; Muslimah Dirayati; Dinda Yesi Liswanti Silaban; Rina Oktavia; Osland First Purba
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.v12i02.429

Abstract

This study aimed to investigate the effect of the distance between electrodes on the performance of graphite-coated interdigitated electrode (IDE) sensors for temperature changes measurement. IDE sensors have good potentials in various application due to large surface area, low cost, versatility, and customizable geometry. Furthermore, graphite have good thermal conductivity, adequate stability, and easy availability so that the combination of IDE sensor and graphite is very potential to be used as a temperature sensor. This study focused on IDE sensors that were made in two variations, namely one sensor with an electrode distance or spacing of 0.45 mm and the other sensor 1.00 mm. Graphite solution was made with epoxy. Then, it coated on the sensor using a dip coating technique. The sensor response was tested by observing the change in resistance to temperature variations between 30°C and 50°C. The results showed that the resistance of sensor decreased with increasing temperature. This showed the tendency of the sensor to the thermistor type of sensor with a negative temperature coefficient (NTC). The sensor with an electrode distance of 1.00 mm showed higher sensitivity and responsiveness with a temperature coefficient of resistance (TCR) or α of -0.045%/K and a material constant (β) of 8534.66 K. Meanwhile, the sensor with an electrode spacing of 0.45 mm had a TCR of -0.04%/K and a β of 8577.87 K. These results indicated that the distance between electrodes affected the sensitivity and responsiveness of graphite-coated IDE sensors in measuring temperature.   Keywords: graphite, interdigitated electrodes, temperature sensor.
Pengaruh Variasi Komposisi Aerogel Silika Terhadap Sifat Fisis Pada Pembuatan Biofoam Chandra Gumilang; Roniyus Marjunus; Agus Riyanto; Sutiarno
Jurnal Teori dan Aplikasi Fisika Vol. 14 No. 01 (2026): 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.v14i01.430

Abstract

Biofoam is a type of bioplastic that can be used as an alternative packaging product to replace styrofoam. Biofoam still has a high value of water absorption, so silica aerogel is added as a hydrophobic agent. The purpose of this study was to determine the effect of adding silica aerogel to the functional groups of biofoam, crystal structure, density and water absorption. The method used in this research is thermopressing. The thermopressing method is a method where all the ingredients, started from fiber, starch, silica aerogel and PVA, were mixed to form a dough and then pressed for 3 minutes at 150℃ using a thermopressing tool. In relation to the characteristic results obtained from the FTIR analysis, it was found the presence of silica aerogel functional groups at wave numbers 1058.60 cm-1 and 925.83 cm-1. Apart from silica, the functional groups of cellulose and starch are also found. Furthermore, the results of the crystal structure analysis found silica and cellulose phases with different phase weight percent values. Where the weight percent of the phase for silica increases and the weight percent for the cellulose phase decreases with the addition of silica composition. The results of the physical density test showed that the density value decreased with increasing silica composition. The results of the analysis of water absorption show that the value of water absorption increases with increasing silica composition, this is because silica has morphological properties in the form of an ultraporous solid material that is able to absorb more water, and the phase separation method is not carried out on silica to obtain silica. with high hydrophobic properties. Keywords: Biofoam, silica airgel, water absorption  
Analisis Distribusi Dosis Pada Terapi Alpha dengan Teknik Pencil Beam Scanning Pada Tumor Kraniofaringioma Menggunakan Software MCNP6 Andina Riswandari Zulhiznaniyah; Riyatun; Suharyana
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.v13i01.436

Abstract

This study was conducted with simulation modeling on alpha therapy for the treatment of craniopharyngioma tumors using the reference head and neck phantom geometry from Lazarine (2006), which was equipped with spherical target cell geometry. The target cell geometry with a radius of 1.05 cm contains 27 partitions located at the base of the brain close to the spine. This simulation was performed using pencil beam scanning which has a beam size of 0.35 cm and was irradiated from the left direction as far as 25 cm from the skin surface by giving 5 variations of energy ranges 425, 430, 440, 445 and 450 MeV. The results of the simulation obtained an average absorbed dose of (1.30 ± 0.01) x 10-9 Gy/α with an isodosis rate of 62%. In addition, this study also takes into account the dose received by healthy cells around the tumor. The brain organ received the largest dose of (2.69 ± 0.01) x 10-13 Gy/α, when compared to the brain tumor cells received a dose of 0.021%. From the dose distribution to tumor cells, the irradiation time for craniofaringioma tumors is (13.3 ± 0.01) s with an α particle current of 1nA. Keywords: MCNP6, Alpha Therapy, Craniopharyngioma tumors, Pencil Beam.

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