cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Junaidi
Contact Email
junaidi.1982@fmipa.unila.ac.id
Phone
+6281703204223
Journal Mail Official
jtaf@fmipa.unila.ac.id
Editorial Address
https://jtaf.fmipa.unila.ac.id/index.php/jtaf/editorialteam
Location
Kota bandar lampung,
Lampung
INDONESIA
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
 30   31   32   33   34 
Simulasi Model Material Tanah Pada Bidang Gelincir Longsor Dengan Variasi Sudut Kemiringan (Studi Kasus Material Tanah di Daerah Kabupaten Gorontalo Utara) Rabiyatul Hajar Saleng; Asri Arbie; Dewa Gede Eka
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.342

Abstract

Landslides are one of the geological disasters that often occur in Indonesia. North Gorontalo is an area where landslides occur every year. Based on data from the 2022 Badan Penanggulangan Bencana Daerah (BPBD), in the last year, there were 8 landslides. Landslides can occur due to several factors, namely; human factors and natural factors. In principle, landslides occur when the restraining force is less than the driving force. In this study a landslide simulation will be carried out using a simulation model made on a lab scale, the size of the simulation model is 40 cm x 30 cm x 25 cm. The simulation was carried out using soil samples taken at the research location. Variables that were observed during the simulation were the effect of the slope angle (o) on the exiting water (ml), the water infiltration time (t), and the effect of the slope (o) on the depth of the slip plane (cm). The soil taken from the research location will be subjected to a sieving analysis test with a hydrometer test to determine the texture class of the soil. From the soil texture test results, some of the research locations have a sand-gravel type of texture. The simulation test carried out also obtained the result that the slope of the slope greatly influences the water infiltration time with the depth of the slip plane. The greater the angle of the slope of the sled that is carried out, the results of the variable being measured will also be directly proportional.
Peningkatan Fungsi Daun Chaya sebagai Agen Reduksi pada Sintesis Seng Nanopartikel sri wahyu suciayti; Suprihatin Suprihatin; Fegi Liani; Posman Manurung
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.343

Abstract

Nano-ZnO biosynthesis has been carried out using Chaya leaves with the addition of 0.7M NaOH. The aim is to determine the results of nano-ZnO synthesis regarding the formation of functional groups, phase structure, morphology, band gap energy, and its potential as an antibacterial. The synthesis process was carried out in three stages, namely, extraction of Japanese papaya leaves, synthesis of nano-ZnO, and characterization using Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and UV-Diffuse Reflectance (UV-DRS). Nano-ZnO samples were applied in antibacterial tests. The results of FTIR analysis show the formation of ZnO functional groups at wave numbers 599-509 cm-1 with the main functional groups involved being O-H, C=O, N-H, and C-N. The results of the XRD analysis showed that the phases formed in the sample were zinc oxide, zinc phosphate, zinc iron oxide and zinc chlorate hydrate. Factors that influence the formation of other phases are because Japanese papaya leaves contain phosphorus and iron, the ZnO phase formed has a wurtzite structure. The results of UV-DRS analysis show that the band gap energy is close to the standard of 3.24 eV with an absorbance value of 362 nm. TEM results show that the particle morphology experiences agglomeration due to the presence of other compounds. The antibacterial activity of Nano-ZnO with a NaOH concentration of 0.7 M resulted in an average zone of inhibition of bacterial growth in E.coli of 0.21 mm.
Electric Field Controlled Anisotropic Rashba Splitting in Janus Chromium Dichalcogenide Monolayers : A Computational Study based on Density Functional Theory Muhammad Anshory; Yusron Darojat; Yusuf Affandi
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.344

Abstract

In this study, we explore the electronic structure of Janus Chromium Dichalcogenide monolayers CrXY (X ? Y = S, Se, Te) in the first Brillouin zone using Density Functional Theory. Due to the mirror symmetry break and strong SOC in the crystal structure of Janus Chromium Dichalcogenide monolayer, we discovered Rashba splitting at ? points in the first Brillouin zone. We analyze this anisotropy of Rashba splitting using k?p perturbation theory and group symmetry analysis. By giving the effect of external electric field, we manipulate the characteristics of Rashba splitting on the Janus Chromium Dichalcogenide monolayer. The manipulation of Rashba splitting by applying external electric field, shows that the Janus Chromium Dichalcogenide monolayers has the potential for spintronic devices.
Analisis Pengaruh Ukuran Lantai Muatan Timbangan Terhadap Nilai Error Pada Pengujian Eksentrisitas Timbangan Elektronik Sesuai OIML R76 Geston Bakti Muntoha; Danang Erwanto; Dian Septi Nur Afifah
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.345

Abstract

The use of high-intensity non-automatic weighing instruments can cause users to overlook the load's location during weighing. However, electronic non-automatic weighing instruments maintain measurement accuracy regardless of the load's position. This study aims to analyze the effect of load receptor size on error values when testing non-automatic weighing instruments eccentricity using the OIML R-76 recommended method. Testing the eccentricity of electronic non-automatic weighing instruments with the same construction model, load cell, and indicator but different load receptor sizes can affect the non-automatic weighing instruments' error values. The largest error value on Instrument A, with a load floor size of 40x30cm, is -0.025kg at test point 4. On Instrument A, the smallest error value at test points 1, 2, and 5 is -0.005kg. On Instrument B, with a load floor size of 60x50cm, the largest error value at test points 1 and 4 is -0.005kg, respectively. At test points 2-3-5, the smallest error value on Instrument B is 0kg. The average error on Instrument A is -0.01kg, while on Instrument B it is 0kg. The size of the load receptor affects the increase in the error value of a non-automatic weighing instrument, with larger load receptor resulting in greater error values, even if the construction design of the load receptor support is the same.
Evaluasi Nilai Diagnostic Reference Level (DRL) pada pemeriksaan CT Scan Thorax Kontras klinis tumor paru di RS X Jakarta Yuly Ekayanti; Gando Sari; Muhammad Irsal; Heri Kuswoyo
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.346

Abstract

A contrast thorax CT scan is a CT scan procedure in the chest area (thorax) that uses a contrast agent to improve visualization of organs and structures in the chest. Lung tumors are the growth of abnormal lumps in lung tissue which can be benign or malignant. Awareness of the potential and increasing radiation dose in all CT scan examinations encourages radiographers to want and be able to minimize radiation exposure as the main goal in radiological examinations and also strive for radiation protection during examinations. CT scan radiation dose accounts for 70% of the total dose received from medical imaging. High or low doses of radiation received can increase the risk of cancer. The large dose of radiation received by a patient during a CT scan, therefore regulations are needed that will guarantee monitoring of the radiation dose received by the patient to ensure that the dose received is commensurate with medical purposes. The radiation dose to the patient needs to be optimized by applying the Diagnostic Reference Level (DRL) to optimize medical exposure protection for the patient. Dosage evaluation in clinical contrast chest CT scan examinations for lung tumors and the application of DRL in these examinations have never been carried out at RS X Jakarta. Objective: This study aims to determine the DRL value in clinical contrast thorax CT scan examination of lung tumors at RS CTDIvol and DLP values from clinical contrast Thorax CT Scan examination of lung tumors. The DRL value is calculated at Quartile 3 (75 percentile) using the descriptive frequency test and Wilcoxon test in the SPSS application, then compared with the latest IDRL value. Results: Quartile 3 value (75 percentile) from CTDIvol and DLP CT scan chest contrast clinical lung tumors, namely The CTDIvol value was 12.55 mGy and the DLP was 439 mGy.cm. Conclusion: The DRL value in the clinical contrast thorax CT scan for lung tumors at Hospital X Jakarta. is still below the recommended standard, which shows that the radiation output dose in this examination practice is within normal limits and is classified as safe
MODIFIKASI RANCANG BANGUN ALAT UJI COLIMATOR & BEAM ALIGNMENT TEST TOOL DI INSTALASI RADIOLOGI RSUD Dr. Hi. ABDUL MOELOEK PROVINSI LAMPUNG Irma Rahmania; Tri Suranti
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.347

Abstract

INTISARI Latar Belakang : Salah satu problem yang biasa ditemui pada pesawat sinar-X adalah ketidaktepatan luas lapang kolimator terhadap luas lapang berkas sinar-X. Pada pengukuran kesesuaian luas lapang berkas radiasi terhadap berkas cahaya, apabila hasil yang didapatkan adalah berhimpit atau tidak, maka dapat ditentukan ada atau tidaknya pergeseran antara luas lapang berkas radiasi terhadap berkas cahaya. Tujuan Umum: Untuk menghasilkan modifikasi rancang bangun alat Uji Colimator & Beam Alignment Test Tool di instalasi radiologi RSUD Dr. Hi. Abdul Moeloek di provinsi Lampung. Metodologi Penelitian: Desain penelitian ini menggunakan Desain Deskriptif Kuantitatif pendekatan eksperimen terhadap modifikasi Uji Colimator & Beam Aligment Test Tool. Deskriptif adalah metode yang berfungsi untuk mendeskripsikan atau memberi gambaran terhadap objek yang diteliti melalui data atau sampel yang telah terkumpul sebagaimana adanya, tanpa melakukan analisis dan membuat kesimpulan yang berlaku umum Hasil dan Kesimpulan : hasil pengukuran pada kamar 6 menunjukan bahwa Skala luas lapangan kolimator Standar NCRP (? 2 %) yaitu 0.5 cm dan Kesearahan berkas sinar-X Standar NCRP (?30) yaitu 0.60. Kata Kunci : Modifikasi Uji Colimator dan Beam Alignment Test Tool
Dynamic Viscosity Measurement Method Based on the Stokes Drag of Prolate Ellipsoidal Mass Arifrahman Yustika Putra; Efta Yudiarsah; Arief Sudarmaji
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.348

Abstract

Viscometer plays an important role in the field of tribology. One way to measure viscosity is to use the Stokes drag principle in the underdamped harmonic oscillation phenomenon. This paper proposes a dynamic viscosity measurement method based on the related physical laws. Our experimental model involves a prolate ellipsoidal mass that experiences underdamped harmonic oscillation within viscous liquid samples. We observed the oscillations of the prolate ellipsoid to obtain the viscous damping coefficient of each sample and substituted it to the theoretical formula of dynamic viscosity. Experimental data suggest that the mathematical model has failed to predict the viscosity values of the samples. In addition, the regression curve of the reference viscosity and the measured viscous damping coefficient shows that the two quantities have an exponential relation instead of linear relation as explained in the theoretical model. We considered the regression formula as the empirical measurement transfer function and used it to measure the viscosity of an ISO VG 150 industrial oil sample. This measurement resulted in a 2.40 % of relative error percentage. Lastly, this measurement method is only valid for measuring samples with viscosities ranging from 0.0400 Pa s to 0.256 Pa s.
Subsurface Utility Identification at ITERA Campus Using Multi-frequency Ground Penetrating Radar Andri Yadi Paembonan; Fedy Darma Wijaya Waruwu
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.349

Abstract

Infrastructure development at the Sumatra Institute of Technology is growing rapidly, hence, it requires new utilities installation network such as cables and pipes to supply electricity and clean water. Installing new utility line, it is necessary to secure and know the existence and depth of the previously embedded utility network to avoid damage that could hamper the construction process or cause large losses. Accessing the sub-surface information, geophysical method, such as Ground Penetrating Radar (GPR) can be utilized for identifying buried utility networks, ensuring the safe installation of new utilities and preventing damage to existing embedded utilities. In this study, a GPR device with a frequency range 40 MHz-3.4 GHz comprising 5 tracks was employed. The acquired data underwent processing using GPR Insights software, generating a radargram cross-section that provides information about the subsurface.The results from the radargram reveal a hyperbolic reflection anomaly, signifying the presence of a utility network beneath the surface, suspected to be pipe and cable utilities. The utility network is detected at varying depths of 0.5 m, 0.8 m, 1 m, and 1.2 m at different distances. Furthermore, several anomalies in the form of hyperbolas are observed, suggesting potential utilities due to their continuity with other paths.
Hotplate Magnetic Stirrer Dilengkapi Pengatur Waktu, Suhu dan Kecepatan Melalui LCD Nextion Imam Tri Harsoyo; M. Ulin Nuha ABA; Bayu Wahyudi; Dennis Aji Firmansyach
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.350

Abstract

Analisis Distribusi Dosis Terapi Proton dengan Kolimator Pencil Beam pada Kanker Limfoma Orbita menggunakan Software MCNP6 Ike Septiani Prastika; Suharyana Suharyana
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (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.v12i1.351

Abstract

Page 32 of 40 | Total Record : 395

 30   31   32   33   34 

Filter by Year

2013 2026


Reset
Filter By Issues
All Issue Vol. 14 No. 01 (2026): Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 02 (2025): Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 01 (2025): Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (2024): Jurnal Teori dan Aplikasi Fisika Vol. 11 No. 2 (2023): Jurnal Teori dan Aplikasi Fisika Vol. 11 No. 1 (2023): Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (2022): Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): Jurnal Teori dan Aplikasi Fisika Vol. 9 No. 2 (2021): Jurnal Teori dan Aplikasi Fisika Vol. 9 No. 1 (2021): Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 2 (2020): Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): Jurnal Teori dan Aplikasi Fisika Vol. 7 No. 2 (2019): Jurnal Teori dan Aplikasi Fisika Vol. 7 No. 1 (2019): Jurnal Teori dan Aplikasi Fisika Vol. 6 No. 2 (2018): Jurnal Teori dan Aplikasi Fisika Vol. 6 No. 1 (2018): Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 2 (2017): Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): Jurnal Teori dan Aplikasi Fisika Vol. 4 No. 2 (2016): Jurnal Teori dan Aplikasi Fisika Vol. 4 No. 1 (2016): Jurnal Teori dan Aplikasi Fisika Vol. 3 No. 2 (2015): Jurnal Teori dan Aplikasi Fisika Vol. 3 No. 1 (2015): Jurnal Teori dan Aplikasi Fisika Vol. 2 No. 2 (2014): Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 1 (2013): Jurnal Teori dan Aplikasi Fisika More Issue