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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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Karakterisasi Sifat Kekuatan Tarik Komposit Laminat Partikel Cangkang Kerang Simping/E-Glass dengan Matriks Poliester Kusairi Kusairi; Nurun Nayiroh
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.302

Abstract

Plasma Non Thermal Sebagai Sterilisasi Masker untuk Inaktivasi Virus Corona (COVID-19) Fadil Abdullah; Valentinus Galih Vidia Putra
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.303

Abstract

We used non-thermal plasma generators to sterilize textile materials, especially in personal protective equipment for masks, to inactivate viruses and bacteria attached to the mask material in this study. The design of the ozone generator utilizes the non-thermal plasma method of corona discharge using a high voltage generator with an output voltage of 3.,000 V. The sterilization process was carried out with variations in sterilization time (10,15 and 20 minutes) and an active electrode height of 3 cm. This research was carried out using CT RT-PCR testing to determine the cycle threshold value contained in the nucleic acid RNA of the COVID-19 virus before and after sterilization. Changes in CT values obtained after sterilization for 20 cycle threshold (CT) values were 37.07 for the N gene and 35,67 for the ORF. Based on the sterilization test results, no data stated that the virus was harmful. Based on these results, the increase in CT numbers is directly proportional to the length of time for sterilization so that the RNA content of the COVID-19 virus decreases. To determine the effect of the sterilization process on the hydrophilic properties of the maks, the Fourier Transform Infra-Red (FTIR) test was carried out. The study results show that non-thermal plasma can sterilize masks from the coronavirus. This study concludes that the plasma method can be used to sterilize masks from the coronavirus
Analisis Pengaruh Ketinggian Tanah dan Kedalaman Sumur terhadap Suhu dan pH Air Sumur di Kabupaten Blitar Muhammad Syafa Tirtana Sanjaya; Tamara Pingki
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.304

Abstract

Abstract. The fulfillment of human daily needs cannot be separated from water. The water most used by the community is ground water. One of the factors that can affect water quality is the depth of the water source. The purpose of this study was to analyze the effect of soil height and well depth on the temperature and pH of well water in Blitar Regency. The data was taken from 4 sub-districts in Blitar Regency, namely Ponggok, Nglegok Kesamben, and Selorejo. The characteristics of the pH of the water have an average of 6.7 and a water temperature of 23.43?C. If the depth of the well is increased by 1 meter, the pH of the water will increase by 0.1177 units. If the depth of the well is increased by 1 meter, the water temperature will increase by 0.126?C. Based on the results of the simultaneous test, it is known that the depth of the well and the height of the soil have a significant effect on water pH and water temperature. Based on the results of the partial test, it is known that the depth of the well has no significant effect on water pH and water temperature. However, the height of the soil has a significant effect on water pH and water temperature. Based on the results of the model goodness test, it can be seen that the proportion of water pH variability can be explained by the variable depth of the well and the height of the soil by 36.03% and the remaining 63.97% is influenced by other variables outside the model and the proportion of water temperature variability can be explained by the variable depth of the well and the ground height is 92.58% and the remaining 7.42% is influenced by other variables outside the model.Keywords: Depth, Altitude, pH, Temperature.Abstrak. Pemenuhan kebutuhan sehari-hari manusia tidak dapat terlepas dari air. Air yang paling banyak dimanfaatkan masyarakat adalah air tanah. Faktor yang dapat mempengaruhi kualitas air salah satunya adalah kedalaman sumber air. Tujuan dari penelitian ini adalah menganalisis pengaruh ketinggian tanah dan kedalaman sumur terhadap suhu dan pH air sumur di Kabupaten Blitar. Data yang diambil berasal dari 4 kecamatan di Kabupaten Blitar, yaitu Ponggok, Nglegok Kesamben, dan Selorejo. Karaktersitik pH air memiliki rata-rata sebesar 6,7 dan suhu air sebesar 23,43?C. Jika kedalaman sumur bertambah 1 meter maka pH air akan bertambah sebesar 0,1177 satuan. Jika kedalaman sumur bertambah 1 meter maka suhu air akan bertambah sebesar 0,126?C. Berdasarkan hasil uji serentak diketahui bahwa kedalaman sumur dan ketinggian tanah berpengaruh signifikan terhadap pH air dan suhu air. Berdasarkan hasil uji parsial diketahui bahwa kedalaman sumur tidak berpengaruh signifikan terhadap pH air dan suhu air. Namun ketinggian tanah berpengaruh signifikan terhadap pH air dan suhu air. Berdasarkan hasil uji kebaikan model dapat diketahui bahwa proporsi variabelitas pH air dapat dijelaskan oleh variabel kedalaman sumur dan ketinggian tanah sebesar 36,03% dan sisanya sebesar 63,97% dipengaruhi variabel lain diluar model serta proporsi variabelitas suhu air dapat dijelaskan oleh variabel kedalaman sumur dan ketinggian tanah sebesar 92,58% dan sisanya sebesar 7,42% dipengaruhi variabel lain diluar model.Kata kunci: Kedalaman, Ketinggian, pH, Suhu.
Perhitungan Desain Konsep Reaktor Cepat Berpendingin Karbondioksida Superkritis dan Berbahan Bakar Uranium Metalik Alam Via Vionita; Fiber Monado; Menik Ariani; Idha Royani
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.305

Abstract

This study discusses the design concept of the fast reactor core with supercritical carbon dioxide as coolant and natural metallic uranium as fuel that has been burnup for one hundred years. Calculations and simulations are performed using the SRAC code. The PIJ-SRAC module is for calculating the fuel cell level, and the CITATION-SRAC module is for calculating the reactor core level. Radial modified CANDLE is applied as a fuel arrangement strategy in the reactor core. The survey parameters were calculated in the form of burnup level, infinite multiplication factor (kinf), the density of fissile and fertile atoms, conversion ratio, and ef ective multiplication factor (kef ). The calculated reactor core thermal power varies from 400 MWt, 450 MWt, and 500 MWt. Based on calculation and simulation results, a reactor with thermal power of 450 MWt with geometry RZ (R = 150 cm and Z = 150 cm) is the best design. The calculation results show that the kef value from the beginning of the combustion cycle is around 1.002662 with a reactivity value of 0.2654%; until the end of the cycle, the kef value is 1.041057 with a reactivity value of 3.9437%.
Karakteristik Struktur Mikro, Struktur Fasa dan Sifat Fisis Komposit Silika Sekam Padi dengan Aspal Devi Ika Safitri; Simon Sembiring; Leni Rumiyanti
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.306

Abstract

Studi Seismik Tomografi Waktu Tempuh Untuk Identifikasi Zona Lemah dengan Menggunakan Konsep Ray Tracing Berdasarkan Algoritma Dijkstra Wiji Raharjo; Indriati Retno Palupi; Intan Paramita Haty
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.307

Abstract

Tomography is a popular method in describing the subsurface based on P and S waves parameter of the seismic wave. It can show the low velocity zone or the weak zone that usually associated with the structure or fluid evidence. However, it needs some informations about the hypocenter and stations location, and the initial velocity model as the geological model. Based on the information, then ray path on each grid/block in the research area is calculated along from the hypocenter to the each station. Ray path concept is based on the Snell Law, Fermat and Hyugens principle where the wave will be dispersioned when it faces to the different medium and it will choose the medium with the fastest travel time. Then by the inversion process, the tomogram can be resulted. Dijkstra Algorithm is choosen as the basic mathematical equation for the ray path calculation because it is easy and use in some digital platform. This algorithm is provened can result the good tomogram where it can be showed the structure of the geological model.
Pengaruh Variasi Biokomposit (CaCO3: Tepung Jagung) Terhadap Nilai Penyusutan, Kekuatan Tarik, Kekuatan Tekuk, dan Mikrostruktur Agris Setiawan; Tri Wahyuningsih; Margaretha Tri Budi Yuliana
Jurnal Teori dan Aplikasi Fisika Vol. 10 No. 2 (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.v10i2.308

Abstract

Efektivitas Tungsten sebagai perisai radiasi foton Sitti Yani
Jurnal Teori dan Aplikasi Fisika Vol. 11 No. 2 (2023): 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.v11i2.309

Abstract

Pengolahan Air Sadah Menggunakan Zeolit Buatan Dari Batu Apung Lampung Dan Daun Kerai Payung Nindia Agustin; Pulung Karo Karo; Sudibyo Sudibyo; Suprihatin Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 11 No. 2 (2023): 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.v11i2.310

Abstract

This research was conducted to determine the composition and crystal structure of the artificial zeolite produced, as well as the ability of artificial zeolite to reduce calcium and magnesium content in hard water. The zeolite was prepared using the hydrothermal method by mixing sodium silicate from Lampung pumice silica, sodium aluminate from aluminum can waste and charcoal from sunshade umbrellas. The artificial zeolite products were characterized using XRF, XRD, UV-Vis spectrophotometric and ICP-EOS. The results showed that the composition of the artificial zeolite was aluminum, silica, phosphorus, potassium, calcium, titanium, vanadium, chromium, manganum and ferum. The crystal structure of the optimum sample from the UV-Vis spectrophotometric characterization obtained the crystal structure of a natural zeolite type, namely Chabazite. And the artificial zeolite which was tested for adsorption on hard water could reduce the calcium content by 36.57% but could not reduce the magnesium content.
Smart Glove Berbasis IoT dengan Output Teks dan Suara Imam Tri harsoyo; M. Ulin Nuha ABA; Dwi Cahyati
Jurnal Teori dan Aplikasi Fisika Vol. 11 No. 2 (2023): 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.v11i2.311

Abstract

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