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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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Studi Pendahuluan Pembentukan Gugus Fungsi dari Komposit Perak Silika (Ag/SiO2) Berbasis Sekam Padi Rifa Dian Eka Farah; Nur Fattiah Amanda; Simon Sembiring; Junaidi Junaidi
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.282

Abstract

Studi Pendahuluan Penentuan Nilai Energi Band Gap Komposit Perak Silika (Ag/SiO2) Berbasis Sekam Padi Desi Novitasari; Letha Agatha Lusiana; Simon Sembiring; Junaidi Junaidi
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.283

Abstract

KARAKTERISTIK STRUKTUR DAN TERMAL KOMPOSIT ASPAL KARBOSIL SILIKA SEKAM PADI Devi Yulianti; Simon Sembiring; Junaidi Junaidi
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.284

Abstract

Telah dilakukan sintesis dan karakterisasi aspal yang dimodifikasi dengan karbosil dan silika. Penelitian ini dilakukan untuk mengetahui mikrosuktur dan struktur komposit aspal karbosil silika dengan perbandingan komposisi berat yaitu 50:50:0; 42,5:42,5:15; 40:40:20; 37,5:37,5:25; 35:35:30; 32,5:32,5:35. Silika diperoleh dengan menggunakan metode alkalis dan karbosil diperoleh dengan metode pirolisis. Hasil analisis XRD diperoleh fasa yang terbentuk dari setiap variasi komposisi adalah fasa amorf. Analisis DTA/TGA menunjukkan terjadinya perubahan energi akibat penambahan panas dengan ditandai adanya penyusutan massa pada sampel. Variasi komposisi pada sampel menunjukkan terjadinya penurunan nilai pada kuat tekan, porositas dan perubahan ketebalan.
THE INFLUENCE OF ELECTRICAL VOLTAGE ON FORMATION OF SILICA NANO FIBER WITH ELECTROSPINNING METHOD Erika Sempana Ginting; Posman Manurung; Yanti Yulianti
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.285

Abstract

KARAKTERISTIK FUNGSIONALITAS DAN MIKROSTRUKTUR KOMPOSIT ASPAL-SILIKA-KARBOSIL Lady Permatasari; Simon Sembiring; Posman Manurung
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.286

Abstract

Synthesis and characterization of asphalt have been modified with silica and carbosil composite. This research was conducted to determine the functionality and microstructure of the asphalt-silica-carbosil composite with a weight composition ratio of 0:50:50; 15:42.5:42.5; 20:40:40; 25:37.5:37.5; 30:35:35; 35:32.5:32.5. Silica is obtained from rice husk using the sol gel method and carbosil was obtained by the pyrolysis method. The results of FTIR analysis obtained that the functional groups formed from each composition variation were O-H, C-H, C?C, C=O, Si-O-Si, and Si-O. The results of microstructural analysis showed the presence of lumps scattered on the surface. The composition of the elements formed is dominated by elements of C, Si, O, N, and a little Na, K and S. Variations in the composition of the sample indicate an increase in the density value, a decrease in the value of water absorption and hardness.Telah dilakukan sintesis dan karakterisasi aspal yang dimodifikasi dengan komposit silika dan karbosil. Penelitian ini dilakukan untuk mengetahui fungsionalitas dan mikrostruktur komposit aspal-silika-karbosil dengan perbandingan komposisi berat 0:50:50; 15:42.5:42.5; 20:40:40; 25:37.5:37.5; 30:35:35; 35:32.5:32.5. Silika diperoleh dengan menggunakan metode alkalis dan karbosil diperoleh dengan metode pirolisis. Hasil analisis FTIR diperoleh gugus fungsi yang terbentuk dari setiap variasi komposisi yaitu O-H, C-H, C?C, C=O, Si-O-Si, dan Si-O. Hasil analisis mikrostruktur menunjukkan adanya gumpalan yang mengindikasikan sebagai silika-karbosil yang tersebar di permukaan. Komposisi unsur yang terbentuk adalah didominasi unsur C, Si, O, N, dan sedikit Na, K dan S. Variasi komposisi sampel menunjukkan adanya peningkatan nilai densitas, penurunan nilai daya serap air dan kekerasan.
Fabrikasi Nanofiber PVA/Fe3O4 dengan Metode Elektrospinning Nuril Fathurin; Diah Hari Kusumawati
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.287

Abstract

Analisis Uji Peluncuran Roket Air Berbasis Carbon Fiber Menggunakan Sistem Telemetri Qonitatul Hidayah; Umi Salamah; Margi Sasono
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.288

Abstract

Rocket technology with water propellant is becoming more popular and as an alternative to be applied to education and recreation, such as industry and the military. The use of water rockets as an easy, safe, and inexpensive means of measuring physical parameters at heights above the earth's surface is being intensively carried out. One alternative solution is aerodynamic water rocket technology equipped with a telemetry system. The rocket used for the test launch is made from untested carbon fiber. Flight test settings by filling 1/3 of the tube volume with water and a pressure of 200 psi. The results of the water rocket launch show a maximum height of 265 feet or 80.77 m. Changes in acceleration on the x-axis, y-axis, and z-axis indicate the normal motion of the flying rocket. Analysis of stability and control of the rocket is seen in the measurement of the tilt angle of roll, pitch, and yaw. When the rocket moves or tilts, the angle measured corresponds to the tilt. In the roll condition, the rocket moving from launch to landing shows the rocket's rotational motion at an angle of approximately 20o. The potential of water rockets that can still be developed, needs to be increased the reliability of water rockets both in terms of utilization and research.
INVESTIGATION OF NATURAL EXTRACTS AS GREEN CORROSION INHIBITORS IN STEEL USING DENSITY FUNCTIONAL THEORY Muhamad Akrom
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.289

Abstract

One of the materials with low corrosion resistance is steel when it interacts with a corrosive environment. The use of green inhibitors is able to provide good corrosion inhibition performance with high inhibition efficiency on steel. Green inhibitors which in their compound structure contain heteroatom groups (such as O, N, S, P) and aromatic rings are efficiently used as corrosion inhibitors in steel. This paper provides an important comparative overview for the development of green inhibitors of natural extracts in steel. The study of DFT at the atomic level based on molecular orbitals, chemical quantum parameters, and adsorption characteristics showed results that were in accordance with experimental results. The distribution of electron density through the Frontier Molecular Orbitals (FMO) plot illustrates the prediction of active sites through the distribution of the HOMO-LUMO region of inhibitor molecules that interact with the steel surface. To get the correlation between the electronic properties of the inhibitor molecule and the corrosion inhibition potential, calculate the quantum chemical parameters such as ionization potential (I), electron affinity (A), global hardness (?), absolute electronegativity (?), global softness (?) , the transferred electron fraction (?N), global electrophilicity (?) and electron return donation (?Eback-donation) indicate the reactivity of inhibitor molecules which have excellent potential to interact and bind strongly to metal surfaces, thus potentially producing high inhibitory efficiency. The mechanism of corrosion inhibition can be through chemical adsorption and/or physical adsorption by forming a complex compound between the inhibitor molecule and the steel surface to protect it from the corrosive environment. The development of future studies should be able to display the mechanism of interaction and inhibition of inhibitor molecules in more detail and systematically at the atomic level on several metal surfaces such as Fe, Al, Cu, and others.
Local Adaptive Thresholding Menggunakan Metode Sauvola sebagai Tahapan Pra Pengolahan pada Data Citra Isyarat ECG Mohammad Rofi'i; Diah Rahayu Ningtias
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.290

Abstract

Kondisi seseorang dapat diketahui dari aktivitas kelistrikan jantung yang telah direkam dan dicetak dalam bentuk electrocardiogram (ECG). Data ECG dapat digunakan dalam penelitian sebagai modalitas bahan untuk analisis dan diagnosis kondisi jantung. Data tersebut dapat berupa isyarat satu dimensi maupun isyarat dua dimensi dalam bentuk citra atau gambar. Pengolahan isyarat ECG yang diambil dari data cetak fisik di scan untuk mendapatkan data digital sehingga dapat diolah dengan menggunakan komputer. Penelitian ini bertujuan untuk mempersiapkan data citra ECG dalam tahap pra pengolahan yang siap diolah pada tahap selanjutnya, baik untuk keperluan analisis maupun diagnosis melalui data citra ECG. Sehingga diharapkan dapat memudahkan dan menampilkan hasil yang optimal untuk berbagai penelitian dengan modalitas data citra ECG.Algoritma yang diterapkan menggunakan metode pengambangan lokal dari sauvola tecnique. Dengan menggunakan nilai R sebesar 128 dan nilai k=0,34 telah menghasilkan citra isyarat ECG tersegmentasi yang bersih tanpa grid. Dengan melihat nilai MSE dan PSNR dari masing-masing metode menunjukkan algoritma sauvola mendapatkan hasil yang lebih baik dari pengambagan global.
Analysis of Wind Direction and Speed ??of Rainfall Distribution in Tangerang Regency Clara Dwi Lestari Simbolon; Yayat Ruhiat; Asep Saefullah
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 1 (2022): 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.v10i1.291

Abstract

The wind is the horizontal movement of air masses. Wind can occur if there is any difference in pressure between one place to another place. The pattern from the wind movement is the direction and velocity. That pattern becomes a part to influence the rainfall. This research is to determine the direction and velocity of wind who more dominant happens in the Tangerang district using a windrose method and to determine the relationship between the direction and velocity of wind to the distribution of rainfall with multiple linear regression analysis. This research uses secondary data which is daily data during the period of January 2011 to December 2020 and then the data will be processed using WRPLOT and Minitab software. Based on the results using the windrose method the data obtained that the direction of the wind is more dominant blows from the west to the east with an average wind speed of 2.93 m/s. Through the Kolmogorov-Smirnov test, the rainfall distribution test in the Tangerang district is normally distributed. The results of multiple linear regression show that wind has a negative effect on rainfall. The highest rainfall occurred in February 2020 as much as 556 mm with the wind blowing from the west-northwest.

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