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INDONESIA
Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : -
Core Subject : Science,
Jurnal ini diterbitkan oleh Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Lampung sebagai sarana untuk mempublikasikan hasil penelitian, artikel review dari peneliti-peneliti di bidang fisika teori dan aplikasinya. Jurnal ini terbit dua kali setahun (Januari dan Juli).
Arjuna Subject : -
Articles 15 Documents
Search results for , issue "Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1355

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 (ΔQ). 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 (ΔQ), 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 (ΔQ) 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.
Spektrofotometer UV-Vis Untuk Estimasi Ukuran Nanopartikel Perak J Junaidi
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1366

Abstract

We present a simple technique to estimate the size of silver nanoparticles (AgNPs) based on uv-vis spectra computationally. To have the nanoparticles, the AgNPs colloid was prepared by chemical reduction technique using 40 mM of tri-sodium citrate dihydrate (Na3C6H5O7.2H2O) and silver nitrate (AgNO3) at different concentrations of 2.5 and 5.0 mM. The colloid was then analyzed by using UV-Vis spectrophotometer. For comparison of the size estimation, a small amount of AgNPs was also analyzed using transmission electron microscopy (TEM). By fitting the model and the UV-Vis spectra of these colloids, the set fitting parameters can be obtained including the absorption coefficient, the full width at half maximum (FWHM), the wavelength and absorbance of peaks. It is assumed that the shape of nanoparticle is spherical, so that its diameter can be estimated using the values of scattered absorbance and FWHM. Based on the model it is found that the size of AgNPs are (28 ± 8) nm and (15 ± 7) nm for samples prepared with concentration of 2.5 and 5.0 mM, respectively. On the other hand, from statistically estimation using images from TEM, it is found that the size of AgNPs are (17 ± 4) nm and (8 ± 3) nm for samples prepared with concentration of 2.5 and 5.0 mM, respectively. This discrepancy occurs may be due to non-homogenous of the particles. It indicates, however, this computationally simple method can be used as a first step to estimate size of the AgNPs colloid prior to measurement and calculation using advanced equipments and techniques.
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1356

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.
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1362

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 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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1357

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.
Struktur Mikro dan Konduktivitas Listrik Keramik Cordierite dengan Penambahan Magnesium Oksida (0, 10, 15 wt %) Berbasis Silika Sekam Padi Ade Lia Tristiana; Simon Sembiring; Wasinton Simanjuntak
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1352

Abstract

Research was conducted to determine the effect of magnesium oxide 0, 10, and 15wt% to the microstructure and electrical conductivity of cordierite. Cordierite was made by commercial MgO and alumina and silica from rice husk which is extracted by sol-gel method. Synthesis of cordierite was done with solid state reaction method and sintering at 1250ºC for 3 hours. Microstructure cordierite analyzed by SEM/EDS, while the electrical conductivity was analyzed using LCR meter, as well as physical test include its density, porosity and shrinkage. The results showed that the addition of MgO has reduced density, and shrinkage of cordierite and increase porosity. Microstructure cordierite with the addition of MgO indicated that sample with a lot of pores and their agglomeration. Conductivity values decreased with the addition of 10% MgO and increased at 15% MgO.
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1358

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 Karakteristik Elektrik Limbah Kulit Singkong (Manihot esculenta Crantz) Sebagai Sumber Energi Listrik Alternatif Terbarukan Untuk Mengisi Baterai Handphone I Irsan; Amir Supriyanto; Arif Surtono
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1353

Abstract

The electrical characteristics of cassava peel can be determined by using electrode, a pair of electrode that used in this research is Cu-Zn. The measurement of the electrical characteristics of cassava peel had been done using a 1.2 watt LED load and when the load is released. Varieties of cassava which used are white cassava, genjah urang cassava and bassiro cassava. Electrolyte cel that used consists of 20 cells, which were arranged in series with volume 200 ml for one cell. The maximum voltage when the load is removed generated white cassava peel is 12.38 V, genjah urang cassava peel is 14.36 V, and bassiro cassava peel is 13.81 V. Type of cassava peel that has the best electrical characteristics to charge phone battery is genjah urang cassava peel. The test of handphone battery charging had been done when handphone was empty or couldn’t be turned on and when handphone battery had charged for two hours, it made the handphone on for 15 seconds after removed from the circuit.
Perancangan Alat Ukur Kadar Gula Pada Produk Pangan Menggunakan Sensor Kapasitor Keping Sejajar Berbasis Mikrokontroler ATMega8535 Sanjaya, Hardaniyus; Supriyanto, Amir; Pauzi, Gurum Ahmad
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1364

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
Analisis Kelistrikan Sel Volta Memanfaatkan Logam Bekas Yulianti, Devi; Supriyanto, Amir; Pauzi, Gurum Ahmad
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1359

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.

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