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Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology Physics
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).
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Articles 15 Documents
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Search results for , issue "Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
Studi Automatic Picking Waktu Tiba Gelombang P dan S dengan Menggunakan Spektogram pada Obspy Python Indriati Retno Palupi; Wiji Raharjo
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2433

Abstract

One of important thing in locating hypocenter process is determine P and S arrival time of the seismogram. Beside that, frequency analysis by FFT method is needed to know the character of the seismogram, like dominant frequency. For further analysis, FFT method can be a good tools in determine P and S wave arrival time in the spectogram form. This process is called automatic picking. 
Pengaruh Perlakuan Termal Terhadap Karakteristik Aspal Komposit Berbasis Silika Sekam Padi Nita Susanti; Juniati Br Simbolon; Simon Sembiring; Posman Manurung
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2452

Abstract

Synthesis and characterization of asphalt has been modified with silica rice husk with temperature variations of 200, 250, and 300oC. Silica is obtained from rice husk using the sol gel method. Furthermore asphalt and silica are solidified at 110oC. The experiment was conducted to determine the effect of temperature on the microstructure, structure, and functional groups of modified asphalt. SEM analysis shows asphalt modification with a temperature of 300oC in the form of different clumps. XRD analysis showed the phase formed from each temperature was an amorphous phase. The result of the FTIR analysis showed that the functional groups seen in the modified asphalt samples were Si-OH, Si-O-Si, Si-O, and C-H. The compressive strength carried out showed the strength of asphalt again cracks became stronger as the temperature increased.
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2315

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.
Peningkatan Karakteristik Listrik Sel Elektrokimia Cu(Ag)-Zn dengan Penggunaan AnodaTumbal Mgpada Accumulator Berbahan Air Laut Ahmad Pauzi, Gurum; Nisa, Mia Abi; Samosir, Ahmad Saudi; Sulistiyanti, Sri Ratna; Simanjuntak, Wasinton
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2448

Abstract

Penelitian ini dilakukan untuk mempelajari penggunaan magnesium (Mg) sebagai anoda tumbal untuk melindungi Zn yang digunakan sebagai anoda dalam sel elektrokimia untuk menghasilkan energi listrik dari air laut. Sebagai katoda digunakan Cu yang dilapisi dengan logam Ag untuk melindunginya dari korosi katodik. Sel elektrikimia dirangkai terdiri dari 20 sel yang disusun secara seri, dan masing-masing sel diisi air sebanyak 300 mL. Sel elektrokimia dihubungkan dengan beban LED 3 watt 12 volt selama 72 jam dan pengambilan data karakteristik listrik meliputi tegangan, arus, dan intensitas cahaya, setiap 1 jam. Dari data tegangan dan arus, dihitung besarnya hambatan dalam. Hasil penelitian menunjukkan bahwa penggunaan Mg sebagai anoda tumbal menghasilkan data karaktersitik listrik yang lebih besar dibanding dengan sel elektrokimia tanpa penggunaan anoda tumbal.
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2318

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).
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2262

Abstract

Kemajuan tekhnologi di bidang nanomaterial membuat beberapa industri pengolahan silika sudah mulai memproduksi nanopartikel silika sehingga pencarian sumber-sumber baru yang mampu memproduksi silika telah banyak diminati. Salah satu sumber daya mineral yang berpotensi untuk dikembangkan adalah silika (SiO2). Batu apung adalah batu vulkanik berpori amorf yang terdiri dari silika. Pada penelitian ini dibuat nanosilika dari batu apung dengan diekstraksi menggunakan larutan NaOH pada variasi konsentrasi 2,5 M, 2,7 M, 2,9 M, 3,1 M dan 3,3 M untuk mengamati pengaruhnya pada jumlah dan komposisi kimia serbuk nanosilika yang dihasilkan, fasa nanosilika yang terbentuk dan ukuran  nanosilika. Ekstraksi silika ini dibuat dengan metode sol-gel menggunakan refluks. Pembentukan gel silika dilakukan menggunakan H2SO4 5M dan proses pemurnian serbuk silika menggunakan HCl 1,25 M kemudian dikalsinasi pada suhu 800oC selama 6 jam dan dikarakterisasi dengan XRF, XRD, TEM dan FTIR. Hasil yang diperoleh pada penelitian ini menunjukkan pengaruh konsentrasi NaOH pada jumlah serbuk yang dihasilkan yaitu meningkat seiring peningkatan konsentrasi NaOH yang digunakan. Komposisi SiO2 dari semua sampel menunjukkan hasil optimum pada sampel dengan konsentrasi NaOH 2,7 M yaitu 97,1% yang juga memiliki ikatan SiO-Si dan Si-OH, meiliki fasa amorf dan rata-rata ukuran partikel adalah (11,9±2,6) nm.
Karakteristik Termal dan Fungsionalitas Komposit Silika Sekam Padi dengan Aspal Deafani Wahyu Ardaniswari; Josalina Josalina; Hana Haritsah; Simon Sembiring
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2450

Abstract

This research was carried out to investigate the effect of asphalt addition to thermal characteristics, functional groups, physical properties (water absorption, water content, and swelling thickness) of rice husk silica. The mass ratio of silica and asphalt alloys were 1:0; 1:0,4; 1:0,5; and 1:0,6. Silica and asphalt were mixed at 160˚C followed by calcination at 150˚C for 3 hours. Thermal characteristics and phase structures were analyzed using Differential Thermal Analysis/Thermo Gravimetrical Analysis (DTA/TGA), X-ray Diffraction (XRD), and Fourier Transform Infrared (FTIR). DTA/TGA analysis results show that the addition of asphalt causes a decreasing in mass, on set temperature, maximum temperature,  endothermic temperature And an increase in exothermic peak temperature. The results of XRD analysis showed that the addition of asphalt resulted in the appearance of amorphous carbon, shifting the range and the highest intensity of 2θ amorphous silica. The results of FTIR analysis showed that the addition of asphalt resulted in appearance the functional grups of C-H. The addition of asphalt causes a decrease in the value of water absorption, water content, and swelling thickness.
Studi Pengaruh Perlakuan Plasma Terhadap Sifat Material Antibakteri Kain Kassa Menggunakan Minyak Atsiri (Zingiber Officinale Rosc) Wilda Murti; Valentinus Galih Vidia Putra
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2432

Abstract

This work was aimed to study the influence of plasma on changes in functional groups of a  wound dressing called ‘kain kassa’ which immersed in essential oil from ginger (Zingiber Officinale Rosc). In this work also analyze the differences of wound dressing between with or without using the help of plasma. The Wound dressing and the essential oil of ginger were selling in the market, the wound dressing doesn’t have information about fiber which form itself. So, Dissolution test and additional test were carried out. Then, The result of the differences of wound dressing was analyzed with Fourier Transform Infra Red (FTIR), the plasma treated has higher absrobance of  O-H and C-H at wavenumber 3350 cm-1 and 2930 cm-1. However at 1700 cm-1 C=O, the wound dressing without plasma has higher absorbance than wound dressing with plasma
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2303

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.
Pengaruh Penambahan Abu Sekam Padi Terhadap Sifat Fisis dan Mekanis pada Mortar Ahmad Munawir Siregar; Roniyus Marjunus; Simon Sembiring
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2309

Abstract

The research was carried out about the effect of adding rice husk ash to physical and mechanical properties of mortar. Mortar was moulded with three composition comparisons between ordinary portland cement, rice husk ash, and rice stalk fiber. Rice husk ash was burned at temperature of 700 OC for 2 hours, rice stalk fiber was mechanically sliced up to 0.8 mm in size, then mortar molding and maintenance was processed for 28 days. The mortars that had reached the age of 28 days were tested according to the  Indonesia National Standard (SNI) including physical properties (water absorption, density), and mechanical properties (compressive strength, modulus of elasticity, modulus of rupture). Characterization of microstructure, morphology and counting all elements on the surface of  mortar were processed by using Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDS). The results of research that had been carried out, mortar with the most optimum physical and mechanical properties was mortar B with a composition of 65%: 10%: 25%. The results of the characterization using SEM-EDS showed that the surface of mortar B was better with grain diameter (1.4 ± 0.9) µm and the most dominant element in the mortar was element of Ca and Si which functioned as mortar binder and hardener.

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