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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 Karakteristik Elektrik Onggok Singkong sebagai Pasta Bio-Baterai Tri Sumanzaya; Amir Supriyanto; Gurum Ahmad Pauzi
Jurnal Teori dan Aplikasi Fisika Vol. 7 No. 2 (2019): 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.v7i2.225

Abstract

Bio-battery is a battery with paste that is made of natural materials. Bio-battery produce electrical power by using electrolyte cassava pulp and Cu-Zn electrode. Design of bio-batteries are made by 20 cell of dry cell battery type R20S IEC/UM-1/D 1,5 volt and arranged in series. Cassava pulp variation are new cassava pulp and pulp with fermentation for 48 hours, 96 hours, and 144 hours. The measurement of the electrical characteristics using 7 watt LED DC for 12 hours. The maximum voltage when the load is released which genereted by new cassava pulp is 16,76 volt, fermented for 48 hours is 19,28 volt, fermented for 96 hours is 20,00 volt, and fermented for 144 hours is 20,30 volt. The variety of cassava pulp which has the best electrical characteristics is fermented cassava pulp for 144 hours. It could turn on the lamp with bright lights. The results showed that the longer the fermentation time of cassava pulp caused the electrical conductivity was increased.
Pengaruh Penambahan Inhibitor Ekstrak Kopi Dan Waktu Perendaman Terhadap Laju Korosi Pada Baja Karbon Aisi 1020 Dalam Larutan Nacl 3% Hartono Simanjuntak; Ediman Ginting; Suprihatin Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 7 No. 2 (2019): 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.v7i2.226

Abstract

Ekstrak kopi yang digunakan sebagai inhibitor pada sampel baja karbon AISI 1020, direndam dalam medium korosif NaCl 3%. Dengan memvariasikan waktu perendaman 4 hari dan 8 hari, dan juga konsentrasi inhibitor 0%, 3%, 5% dan 7%. Setelah perlakuan pada sampel diperoleh hasil perhitungan laju korosi yang paling lambat pada sampel AISI 1020 8.7 dan yang paling cepat pada sampel AISI 1020 4.0. Inhibitor yang digunakan mempunyai nilai efisiensi paling tinggi pada sampel AISI 1020 4.7. Hasil karakterisasi XRD menunjukkan bahwa struktur kristal yang terbentuk merupakan fasa Fe murni. Karakterisasi SEM menunjukkan morfologi permukaan sampel, terlihat gumpalan pada sampel. Karakterisasi EDS pada sampel terlihat unsur Oksigen (O) yang mengindikasikan bahwa sampel telah terkorosi.
Rancang Bangun Sistem Pengukuran Tekanan Udara Menggunakan DT-Sense Barometric Pressure Berbasis Internet of Things dengan Display Smartphone Indah Tri Handini; Yulkifi Yulkifi; Yenni Darvina
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.230

Abstract

Pengaruh Variasi Konsentrasi NaOH Optimum pada Pembuatan Nanosilika dari Batu Apung Zahra Maria Ulfa; Posman Manurung; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.231

Abstract

Desain dan Modifikasi Sistem Elektrolit Air Laut Dengan Penambahan Bahan Alumina Muhammad Iqbal Yuliansyah; Gurum Ahmad Pauzi; Warsito Warsito
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.232

Abstract

Telah direalisasikan sitem elektrolit berbasis air laut dengan penambahan variasi Alumina. Penelitian ini bertujuan untuk mengetahui alumina terhadap karakteristik tegangan dan arus yang dihasilkan. Variasi alumina yang digunakan yaitu sebanyak 2 gram dan 4 gram. Proses pengujian dilakukan menggunakan 40 buah sel elektrolit dengan sepasang Zn dalam tiap selnya. Waktu pengujian dilakukan selama 48 jam dengan pergantian elektrolit sebanyak 2 kali untuk tiap variasi alumina. Hasil pengujian relatif sama yaitu menghasilkan tegangan sebesar 26,9 volt elektroda Cu-dan arus sebesar 2,5 mA untuk tiap variasi alumina, sehingga diketahui bahwa alumina yang di berikan tidak memberikan perubahan yang signifikan terhadap hasil tegangan, dan arus.
Rancang Bangun Sistem Catu Daya dengan Metode Switching Mode Power Supply (SMPS) Berbasis Arduino untuk Aplikasi Electrospinner Khoirul Effendi; Junaidi Junaidi; Sri Wahyu Suciyati
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.233

Abstract

Research about power supplies has been developed for various requirement. The power supply is used to supply electronic devices and laboratory-scale equipment, one of which is electrospinner. Electrospinner is an instrument used to make nanofibers consisting of several components, namely: power supply, high voltage, syringe pump, and collector drum. Electrospinner requires a stable supply of voltage so that the system can work well and requires a lot of voltage supply to supply components from the electrospinner. Arduino-based switching mode power supply (SMPS) is designed in this research. Arduino-based SMPS makes it possible to produce a stable supply with many outputs. Arduino as a PWM generator is used to control the power supply output voltage based on duty cycle. The results of the study addressed the duty cycle affecting the output of the power supply. The output voltage generated by the power supply can be set from 0-100 V with an accuracy of 98.19%, an error of 1.81% and a precision of 0.02% which is stated by the variation of the coefficient. The power supply produced also has an extra output voltage of 15 VCT and 15 V.
Pengukuran Dosis Eksternal Yang Diterima Oleh Mahasiswa Praktikum Teknik Radiografi di Laboratorium Radiologi Universitas Baiturrahmah Padang Dila Nelvo Dasril; Oktavia Puspita Sari
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.234

Abstract

The utilization of ionizing radiation in the form of X-rays in addition to providing benefits to the medical world also has the potential to have a detrimental effect on workers, patients and, society. Radiation protection is a very important aspect of controlling this adverse effect. Every utilization of ionizing radiation must have endeavored so that the reception of radiation doses by radiation workers is always as low as possible so that the prescribed dose limit (NBD) value is not exceeded. NBD for apprentices and students who are as low as 18 years old, who are carrying out training or practical work, or who because of their educational needs are forced to use a source of ionizing radiation, the same as the NBD that applies to radiation workers. Dose limit values for radiation workers must not exceed 20 mSv (twenty millisieverts) per year on average for five consecutive years. Determination of the external radiation dose received by practicum students at the Baiturrahmah University Radiology Laboratory aims to calculate how much the external radiation dose received by students during carrying out one course. Based on the results of the study found that the measurement of external radiation dose received by the student is 0 or there is no scattering radiation received by students, this is because at the time of exposure they are in the correct position that is behind the control panel wall that has been coated with Lead (Pb).
Analisa Angin Zonal dan Meridional Dalam Menentukan Awal Musim Hujan di Kota Jambi Presli Panusunan Simanjuntak; Agus Safril
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.235

Abstract

Abstrak. Di Indonesia, model prediksi awal musim hujan belum banyak berkembang secara intensif. Kota Jambi merupakan ibukota Provinsi Jambi sebagai memilki lahan kebun/ladang dan sawah tadah hujan yang cukup luas dan berkontribusi yang cukup besar terhadap perekonomian Provinsi Jambi. Kota Jambi sangat memerlukan prediksi yang akurat mengenai awal musim hujan untuk mendukung kelangsungan perekonomian melalui pertanian dan perkebunan. Penelitian ini bertujuan menganalisa komponen angin zonal dan meridional pada lapisan 1000 mb dalam menentukan awal musim hujan di kota Jambi. Prediksi awal musim menggunakan angin zonal dan meridional akan dibagi menjadi 2 kondisi yaitu saat kondisi normal curah hujan bulanan tahun 1997-2017 dan saat kondisi el nino kuat tahun 1997/1998 dan 2015/2016. Berdasarkan pengolahan data tahun 1997-2017 menunjukkan awal musim hujan adalah bulan Desember saat kecepatan angin zonal tertinggi. Dalam penelitian ini komponen angin zonal lebih dominan dibandingkan komponen angin meridional dalam penentuan awal musim hujan. Akan tetapi, saat kondisi el nino komponen angin zonal tidak baik untuk menjadi perkusor awal musim hujan di wilayah Jambi.
Deposisi ZnO Doping Ag pada Substrat Alumunium Foil untuk Degradasi Methylene Blue Sheilla Rully Anggita
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.236

Abstract

This research has successfully deposited ZnO: Ag on aluminum foil substrates with variations in deposition temperature. The purpose of this study was to obtain the surface morphology of ZnO:Ag on aluminum foil substrates with variations in deposition temperature and obtain optimization of the photocatalytic activity of ZnO: Ag in degrading Methylene Blue dyes. ZnO:Ag deposition on the aluminum foil substrate was carried out by the sol-gel method and spray coating deposition technique. Surface morphology characterization and photocatalytic activity with SEM and with UV-Vis. The surface morphology results obtained from ZnO:Ag on aluminum foil substrate with deposition temperatures of 250 ?, 300 ?, 350 ?, and 400 ? are the forms of ganglia with indications as ZnO and Ag grains attached to ZnO. Obtained surface area and roughness level ZnO:Ag decreases with an increase in temperature from 250 ? - 300 ?, and surface area and roughness increases at 350 ? -400 ?. The highest level of roughness is found in the ZnO layer: Ag temperature 400 ?. The most optimum photocatalytic activity is indicated by the largest percentage of degradation. The highest percentage of degradation is shown by the ZnO: Ag layer with a temperature of 350 ? of 87.33%. This is due to the modification of silver at low temperatures which is <400 ? effective for photocatalytic activity.
Perumusan Gaya Atraktif Bola Terapung dengan Metode Eksperimen dan Pengolahan Citra Digital Erlina Erlina; Septian Ulan Dini; Sparisoma Viridi
Jurnal Teori dan Aplikasi Fisika Vol. 8 No. 1 (2020): 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.v8i1.237

Abstract

Abstract. Two floating object interact each other in a certain time when the initial separation distance of them is not greather than the radius. This interaction is caused by asymmetric deformation in the liquid-air boundary plane due to contact with spherical particles. Asymmetric deformation plane of the liquid-air boundary between the two spheres and outside the sphere results an attractive force. This force is experienced by two balls that interact in a certain period of time until they come close to each other and after contact they will bond and difficult to escape. The position of each ball is observed using a video camera with 25 fps specifications and processed using Python and OpenCV and obtained data on the position of the center of mass of the system at any time until both are in contact. From the equation of position to time, the acceleration value of the ball is obtained, so that the magnitude of the attractive force can be known. The attractive force of the object is varied with the density of the object.

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