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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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Deteksi Letak Kebocoran Pipa Berdasarkan Analisis Debit Air Menggunakan Teknologi Sensor Flowmeter Berbasis TCP/IP Duwi Hariyanto; Gurum Ahmad Pauzi; Amir Supriyanto
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.134

Abstract

Pipeline leaks can cause major financial losses for the users of pipeline system. Perusahaan Daerah Air Minum (PDAM) generally uses manual methods to detect leak location, such as by looking puddle above the pipeline. The research proposed to produce a method that can detect pipeline leak location quickly and accurately. The method use water flow sensors that are placed before and after the leak. The water flow sensors are used to record data of the difference between incoming and outgoing water flow (?Q). The data are transmitted to a computer using a network based on TCP/IP. The results showed that the smaller value of the difference between incoming and outgoing water flow (?Q), the farther distance leak location (X). If diameter hole (D) had decreased by 43%, the value of the difference between incoming and outgoing water flow (?Q) would have decreased by 21%. Based on these results, the method for detecting pipeline leak location with technology water flow sensors can distinguish pipeline leak location quickly and accurately.
Reversibilitas Reaksi Elektrokimia pada Elektroda Superkapasitor Zeolit Berbasis Silika Sekam Padi yang Dikalsinasi pada Suhu 450, 550, dan 650? Fatia Ulfah; S Suprihatin; Posman Manurung
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.135

Abstract

Zeolite based silica rice husk has been prepared at temperature of 450, 550, and 650?. This research was conducted to study the effect of calcination temperature in forming of crystalline phases and standard electron rate constant (k0). The zeolite K450 was formed quartz and bohmite phases, zeolite K550 and K650 was formed cristobalite, stishovite, gamma-alumina, and natrolite phases. Electrochemical reaction of zeolite K450, K550 and K650 are irreversible. Peak potential oxidation-reduction is between 240 mV and 390 mV. The higher value of calcination, the higher value of k0. The k0 value of zeolite K450, K550, K650 at scan rate of 1 V/s are 29,658 x 10-9; 36,398 x 10-9; 77,110 x 10-9 cm/s respectively. Natrolite phase of zeolite K550 and K650 have changed zeolite charge be netral. Based on these result, value k0 of zeolite K550 and K650 are going to be a reversible.
Pengaruh Luas Permukaan Spesifik terhadap Kapasitansi Spesifik Elektrode Zeolit Akibat Variasi Suhu Kalsinasi R Rosalina; S Suprihatin; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.136

Abstract

The effect of specific surface area to the specific capacitance of electrode zeolite with variation of calcintion temperatures. This study describes the potential of zeolite as a supercapacitor electrode which aims to determine the effect of surface area on the specific capacitance of the zeolite. Zeolites was synthesized from a mixture of silica based rice husk and alumina using sol gel methode and was calcined at 150, 250, 350, 450, 550, and 650oC. The XRD result showed already formed alumina and silica phases for each calcinations temperature and the temperature of 350oC has formed gmelinite phase which marks have been formed zeolite. The specific capacitance increase in the specific surface area at 90.69 - 150.01 m2/g, and occurred saturation of specific capacitance at a specific surface area of 150.01 m2/g. The highest of specific capacitance is at specific surface area of 150.01 m2/g is equal to 8.13x10-3 F/g obtained from zeolites with calcination temperature of 650oC. Based on this value, the zeolite can be used as a supercapacitor electrode material.
EFEKTIVITAS EKSTRAK DAUN SIRSAK SEBAGAI INHIBITOR PADA BAJA KARBON API 5L DALAM LARUTAN NaCl 3% Apriyanto Supriyo Giri; Ediman Ginting; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.137

Abstract

The effectiveness of soursop leaves extract as inhibitor on carbon steel API 5L in NaCl 3% had been researched. Carbon steel API 5L submersion used NaCl 3% had been done for 144 hours with various concentrations of soursop leaves extract inhibitor adding 0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%. The research of corrosion rate was done by weight loss and electrochemistry methods. The result showed that the higher percentage of soursop leaves extract inhibitor used, the corrosion rate will decrease and capability of inhibit corrosion will increase. The greatest effectiveness of corrosion occurred at concentration of 35% in NaCl 3% and the effectiveness is 86,16%. The X-Ray Diffraction (XRD) characterization result showed that the phase formed is pure Fe. Scanning Electron Microscopy (SEM) characterization showed uneven clusters and smaller size, fewer holes and cracks too with soursop leaves extract inhibitor 35% than soursop leaves extract inhibitor 0%. Energy Dispersive Spectroscopy (EDS) characterization on sample with inhibitor 0% obtained Cl element.
Analisis Kelistrikan Sel Volta Memanfaatkan Logam Bekas Devi Yulianti; Amir Supriyanto; Gurum Ahmad Pauzi
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.138

Abstract

It has been conducted a research to analyze the scrap metals as voltaic cells. The research objective was to utilize scrap metals as an alternative source of electrical energy and as a voltaic cell to the battery. The materials required consist of a electrode copper (Cu), iron (Fe), aluminum (Al) and zinc (Zn), solution of CuSO4.5H2O, solution of ZnSO4.7H2O, solution of Al2(SO4)3.7H2O, solution of FeSO4.8H2O, jelly powder, and salt NaCl. The electrode couple are Cu-Al, Cu-Fe, Cu-Zn, Al-Zn, and Fe-Zn. Volume variation are 20 ml, 25 ml, 30 ml, 35 ml, and 40 ml. Data of the voltage and current taken using a multimeter on each cell, without a load, with a load, and additional load. The results of the research were analyzed the value of power, current, and voltage with the greatest results in Cu-Zn electrode pair. The results are 14,949 mW, 3,05 mA, and 4,96 V.
Karakteristik Termal (DTA/TGA) dan Konduktivitas Termal Cordierite (2MgO.2Al2O3.5SiO2) Berbasis Silika Sekam Padi Akibat Penambahan MgO (0, 10, 15%berat) Annisa Rizka Amalia; Simon Sembiring; Wasinton Simanjuntak
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.139

Abstract

Analisis Dimensi Fraktal Sinyal Elektrokardiografi Rizki Yara Narvinda; Arif Surtono; A Amanto
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.141

Abstract

It has been utilized a research on the fractal dimension analysis of electrocardiographic (ECG) signals. ECG signal is one example of a fractal nature, so that this signal can be calculated using fractal dimension. The purpose of this study calculates the ECG signal by using fractal dimension. Calculation of fractal dimension is processed using matlab 7.8 software with a sampling of the ECG signal on the website www.physionet.org. Fractal dimension method used is the Box-Counting. Classification of signal samples are taken, there are two types: normal and arrhythmia. The results of the dimension values obtained MIT-BIH database Normal Sinus Rhythm is 1.37; MIT-BIH database arrhythmias is 1.49; MIT-BIH database Supraventri arrhythmias is 1.44; and Cu ventricular tachyarrhythmia is 1.21. From these data it can be concluded that the classification dimension values in the range between 1-2 is in a state of cardiac arrhythmias and classification dimension values in a normal state has a value equal to one dimension.
Pengaruh Penambahan Periclase (0,10,15)% Terhadap Karakteristik Struktur dan Kekerasan Cordierite Anggita Maharani; Simon Sembiring; Bambang Joko Suroto
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.142

Abstract

Perancangan Alat Ukur Kadar Gula Pada Produk Pangan Menggunakan Sensor Kapasitor Keping Sejajar Berbasis Mikrokontroler ATMega8535 Hardaniyus Sanjaya; Amir Supriyanto; Gurum Ahmad Pauzi
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.143

Abstract

It has been realizeda instrument measuring of sugar content using sensor chip capasitors parallel based on microcontroller ATMega8535. The research objective design and realize a detector sugar in food product. The design of study was conducted by placing the sensor chip capasitors parallel as input voltage, then the signal will be condition by the Wheatstone Bridge which will be forwarded to the microcontrollel ATMega8535 and displayed on the LCD. The result of measurements performed on the percentage of food product with sugar content of the flour by 4,77%, tapioca starch 33,33%, flour maizeaku 40,69%, tepung ketan putih 32,74%, tepung beras putih 36,96%, sagu 49,46% and beras merah 20,32%. The data were analyzed and obtained the standard deviation by the change of voltage
PengaruhPenambahan Alumina (0 dan 10wt%) Terhadap Karakteristik Termal (DTA-TGA) dan Konduktivitas Termal Bahan Keramik Cordierite Berbasis Silika Sekam Padi Nesya Tamalia; Simon Sembiring; Wasinton Simanjuntak
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): 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.v5i1.144

Abstract

Page 13 of 40 | Total Record : 395

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