Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156
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).
Articles 172 Documents
Pengaruh Unsur Pemadu Mo dan Proses Fabrikasi Terhadap Kekerasan Plat Zirlo-Mo

Tiandho, Yuant ( Jurusan Fisika FMIPA Universitas Lampung, Lampung ) , Manurung, Posman ( Jurusan Fisika FMIPA Universitas Lampung, Lampung ) , Futichah, Futichah ( Pusat Teknologi Bahan Bakar Nuklir – Badan Tenaga Nuklir Nasional, Banten )

Jurnal Teori dan Aplikasi Fisika Vol 1, No 1 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (137.103 KB) | DOI: 10.23960/jtaf.v1i1.482

Abstract

Paduan zirlo-Mo merupakan kandidat material kelongsong bahan bakar nuklir generasi baru. Penelitian ini dilakukan untuk mengetahui pengaruh penambahan Mo dan proses fabrikasi yang dilakukan terhadap kekerasan plat zirlo-Mo. Zirlo-Mo yang dibuat memiliki komposisi Zr-1%Sn-1%Nb-0,1%Fe dengan variasi Mo sebesar 0,3%; 0,4%; dan 0,5%. Fabrikasi yang dilakukan meliputi peleburan, β-quenching, pengerolan panas, anil 760°C, pengerolan dingin 1,5 mm, anil 650°C, pengerolan dingin 1 mm, serta anil 500°C. Melalui uji kekerasan dengan microhardness Vickers tester diketahui bahwa penambahan unsur pemadu Mo dapat meningkatkan kekerasan paduan zirlo-Mo. Proses fabrikasi memiliki pengaruh yang besar terhadap kekerasan zirlo-Mo. Peningkatan kekerasan dapat dicapai dengan melakukan proses β-quenching dan pengerolan. Sedangkan proses anil bersifat menurunkan kekerasan paduan. Kekerasan tertinggi dicapai pada proses rol panas untuk sampel ZM-0,5 dengan nilai kekerasan 3,6 GPa sedangkan kekerasan terendah dicapai pada ZM-0 pasca peleburan dengan nilai kekerasan 1,6 GPa. Kata Kunci: zircaloy, zirlo-Mo, β-quenching, pengerolan, anil, dan kekerasan.

Analisis Laju Korosi pada Sistem Energi Listrik Alternatif Berbasis Elektrolit Air Laut

Pangestu, Sinta Setiani ( Universitas Lampung ) , Pauzi, Gurum Ahmad ( Universitas Lampung ) , Suciyati, Sri Wahyu ( Universitas Lampung )

Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | | DOI: 10.23960/jtaf.v6i1.1821

Abstract

It has been realized an instrument of generating electric power by using a series of Cu-Zn electrode and two different electrolyte types, that are pure seawaterand seawater that has been filtered and added sodium bicarbonate (NaHCO3). The instrument is designed  to do charging and discharging seawater electrolyte manually. Electrolyte cell consist of 20 cell with 20 pairs of copper and zinc electrodes arranged in series. The instrument measurements are measuring the illumination of LED 3 watts and mass of zinc electrode. The Instrument was testedfor 72 hours  with three times electrolyte charging every 24 hours. The result showed that the illumination were generated by instrument with both of electrolyte will decrease by time. The seawater was filtered and added NaHCO3 can turn on  3 wattsLED longer than the pure seawater.On the third day, corrosion rate of  zinc electrode with pure seawater electrolyte is 9 times higher than seawater was filtered and added NaHCO3.

Efektivitas Ekstrak Daun Belimbing Wuluh (Averrhoa Bilimbi L.) Sebagai Inhibitor Pada Baja St37 Dalam Medium Korosif NaCl 3%

Aprilliani, Nia ( Universitas Lampung ) , Suka, Ediman Ginting ( Universitas Lampung ) , Suprihatin, Suprihatin ( Universitas Lampung )

Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | | DOI: 10.23960/jtaf.v5i2.1812

Abstract

The effectiveness of starfruitleaves extract as an inhibitor of St37 carbon steel in a corrosive medium of 3% NaCl had been researched. The concentration of starfruit leaves extract inhibitor was used 0%. 3%. 5% and 7% with immersion time of 4 and 8 days. Corrosion rate testing was done by weight loss method. The results of the research at each immersion time, showed that the optimum concentration of leaves starfruit extract to inhibit corrosion is 5% and the longer time immersion resulted in decreasing corrosion rate on St37 carbon steel. The maximum effectiveness of inhibitor occurred at 5% concentration with 8 days immersion time which is 78.57%. Characterization using Scanning Electron Microscopy (SEM) showed that the surface of steel looks smoother with white on sampleSt37-8-5 and St37-4-5 showing that tannin in starfruit leaves extract has been adsorbed on the steel surface while St37 carbon steel on St37-8-0 and St37-4-5 has a black steel surface with holes and cracks. Characterization using Energy Dispersive Spectroscopy (EDS) obtained oxygen element on sample St37-8-0 St37-4-0 greater concentration and Fe element smaller on sample St37-8-5 and St37-4-5.

Fabrikasi dan Karakterisasi Keramik Kalsium Silikat Menggunakan Bahan Komersial Kalsium Oksida dan Silika dengan Reaksi Padatan pada Suhu 1000 °C

Sari, Sherly Nuria P., Asmi, Dwi

Jurnal Teori dan Aplikasi Fisika Vol 1, No 1 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (381.234 KB) | DOI: 10.23960/jtaf.v1i1.478

Abstract

Dalam penelitian ini telah dilakukan fabrikasi dan karakterisasi keramik kalsium silikat menggunakan bahan dasar komersial kalsium oksida (CaO) dan silika (SiO2) dengan teknik reaksi padatan pada suhu 1000 °C. Penelitian ini bertujuan untuk mengetahui gugus fungsional, mikrostruktur, struktur kristal kalsium silikat yang disintering pada suhu tersebut. Karakterisasi keramik kalsium silikat dilakukan dengan menggunakan FTIR, SEM dan XRD. Hasil FTIR menunjukkan bahwa pada suhu sintering 1000 °C terdapat ikatan Ca–O dan ikatan Si–O–Si sebagai pembentuk keramik kalsium silikat. Hasil SEM menunjukkan bahwa butiran-butiran yang dihasilkan pada mikrostruktur keramik kalsium silikat yang disintering pada suhu 1000 °C belum seragam dan kurang homogen, serta hasil XRD menunjukan bahwa fasa yang mendominasi yaitu oleh fasa wollastonite-2m dengan puncak intensitas tertinggi pada sudut 2θ = 29,98°. Kata Kunci: Kalsium silikat, kalsium oksida, silika, sintering.

Pengaruh Temperatur Austenisasi terhadap Struktur Mikro dan Nilai Kekerasan Material 14%Cr-3%Ni-2%Mo-2%C untuk Aplikasi Bola Gerus

Romaeni, Imaniar, Manurung, Posman ( Universitas Lampung ) , Nurjaman, Fajar ( LIPI )

Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (634.936 KB) | DOI: 10.23960/jtaf.v5i2.1381

Abstract

This study was conducted to determine the effect of heat treatment in the form of sub-critical, austenization, quenching and tempering the hardness values of the white cast iron material as consideration for testing wear resistance of local and foreign products as grinding balls. Samples was treated sub-critical at a temperature of 700°C with a hold time of 2 hours and continued with austenization temperature variation of 850, 950 and 1050°C with a hold time of each sample is 5 hours. The optimum hardness value was obtained at a temperature of 950°C austenization in the amount of 68.3 HRC and decreased at a temperature of 1050°C. It is because the solubility of carbon elements making up the matrix. Next will be tempering at a temperature of 250°C and holding time 2 hours hardness values decreased but the value of wear resistance is obtained even better ie grinding balls of 0.03 g/kg of product due to the combination of its constituent elements, namely chromium-molybdenum and nickel are high the presence of wear phenomena induced martensite.

Desain dan Karakterisasi Penggunaan Sensor Efek Hall UGN3503 untuk Mengukur Arus Listrik pada Kumparan

Warsito, Johan Wahyudi, Gurum Ahmad Pauzi,

Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (303.64 KB) | DOI: 10.23960/jtaf.v1i2.963

Abstract

Hall effect is a deflection of electricity phenomena (electrons) in the conductor plate because of the magnetic fields effect. UGN3503 is a sensor with Hall effect principle, In this study UGN3503 sensor used to measure the electric current in the coil Leybold P6271 with non destructive method. Microcontroller processing results is an electric current measured by system and displayed on a LCD 20x4 in Amperes. Research data were taken 40 times with variations of the electric current ranging from 1 Amperes to 4,9 Amperes. calculated based on these data the average error that occurred in the measurement gauge amounted to 1,44%. Keywords: Hall Effect, UGN3503, ATMega8535.

Analisa Pengaruh Penambahan Variasi Bubuk Andesit Terhadap Karakteristik Kuat Tekan Mortar

Herullah, Herullah ( Universitas Lampung ) , Karo Karo, Pulung ( Universitas Lampung ) , Supriyatna, Yayat Iman ( Lembaga Ilmu Pengetahuan Indonesia ) , Amin, Muhammad ( Lembaga Ilmu Pengetahuan Indonesia )

Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (416.096 KB) | DOI: 10.23960/jtaf.v6i1.1820

Abstract

The effect of andesit powder addition variety on the properties of the mortar compressive strength was carried out. This study aims to investigate  the effect of andesit powder addition variety on the properties of mortar compressive strength which is added on mortar blend by comparing mortar without the addition of andesit powder. Mortar with various andesit powder contents (10, 20, 30, 40 and 50 % by weight respectively) as partial replacement of portland cement at the age of 7, 14 and 28 days curing. The results show that the compressive strength of each ages with andesit powder addition is higher than mortar without the addition of andesit powder. The highest compressive strength are 11.8, 14.3 and 17.4 MPawith andesit powder respectively and 5.6, 7.56 and 11.00 MPa regarding to the mortar without andesit powder. Therefore 30% seems to be the optimal as partial replacement cement level. The results show with decreasing porosity on the mortar, the density will be greater and solid, it will decrease the absorption. The results of X-Ray flourescene indicate that the chemical element of Si, Al and Fe increase with increasing the dosage of andesit powder which is added on mortar blend. Consequently the Ca element may decrease by addition of andesitpowder on mortar endlessly. The X-Ray Diffraction shows the coestite and hematite phase after temperature 900 oC calcination.

Analisis Karakteristik Elektrik Limbah Kulit Singkong Berbentuk Pasta Sebagai Sumber Energi Listrik Alternatif Terbarukan

sutanto, tri ( Universitas Lampung ) , Supriyanto, Amir ( Universitas Lampung ) , Surtono, Arif ( Universitas Lampung )

Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (400.686 KB) | DOI: 10.23960/jtaf.v6i2.1838

Abstract

The electrical characteristics of cassava peel and cassava can be determined by using a pair of electrode copper (Cu) and zinc (Zn). The measurement of the electrical characteristics of cassava peel had been done using a 5 watt LED load and when the load is released. Cassava peel and cassava are used without fermentation and with fermentation. Electrolyte cell that used consists of 20 cells, which were arranged in series and parallel, with volume + 200 ml for one cell. The maximum power generated cassava peel 5.8597 mW, and 14.1052 mW on cassava. Zn2 electrode (zinc battery used) produces a larger power, which is 5.8597 mW compared with Zn1 (ordinary zinc) is 1.9902 mW. Cassava peel without fermentation produces a larger voltage of 20.76 volts, compared with cassava peel 19.17 volts of fermentation. In cassava peel, circuit cell power in series a larger of 5.8597 volts, compared with circuit power in parallel is 5.7078 volts

Pengukuran Panjang Gelombang Sumber Lampu Monokromatis dari Pola Difraksi Cahaya Berbasis Webcamdan Borland Delphi

Sariyanto, Eko, Suciyati, Sri Wahyu, Pauzi, Gurum Ahmad, Junaidi, J

Jurnal Teori dan Aplikasi Fisika Vol 2, No 2 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (586.111 KB) | DOI: 10.23960/jtaf.v2i2.1276

Abstract

Telah dilakukan penelitian untukpengukuran panjang gelombang dari pola difraksi cahaya yang terbentuk ketika melewati sebuah celah tunggal. Penelitian dilakukan dengan memanfaatkan alat ukur pola difraksi cahaya yang terintegrasi langsung dengan sebuah kamera sebagai pengindra. Hasil penelitianmenunjukkan bahwapanjang gelombang dari sumber diperoleh sebesar 583-589 nm. Proses pengukuranpola difraksi dilakukan dengan menggunakan kisi 100 celah/mm, 300 celah/mm, dan 600 celah/mm dengan variasi jarak 50-100 cm. Nilai akurasi pengukuran diperoleh sebesar 99,45-99.59% dengan error sebesar 0,04-0,55%. Sistem yang dibangun telah mampu pula untuk mengukur panjang gelombang cahaya monokromatis denganrange panjang gelombang 450-630 nm.

Analisis Jeruk dan Kulit Jeruk sebagai Larutan Elektrolit terhadap Kelistrikan Sel Volta

asmarani, suci ( Universitas Lampung ) , Suciyati, Sri Wahyu ( Universitas lampung ) , Supriyanto, Amir ( Universitas lampung )

Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Original Source | Check in Google Scholar | Full PDF (746.416 KB) | DOI: 10.23960/jtaf.v7i1.1919

Abstract

It has been conducted a research to analyze Citrus sp as voltaic cell electrolyte liquid based on pH and fruit condition on its electrical properties. The research objective was to utilize citrus sp waste as an alternative source of electrical energy bio-battery. The materials required consists of a copper electrode (Cu), zinc (Zn), electrolyte liquid (50ml) from lime, lemon, medan orange and pontianak orange. Electrode copper Cu used as cathode and zinc (Zn) as anode. The conditions of liquid variations fresh, fermentation 48 hours, and putridity. The acidity level of the liquid was measured using pH meter. The best result of measuring without a load was found in putrid liquid of lemon, which was 19,36 V. Measurement using 1000Ω of load was obtained best result in the 48 hours fermentation of lime liquid, that are 2,369 mW, 0,762 mA and 3,11 V. For the measuring with additional LED, the best results are the liquid of lemon dan lime with permentation 48hours, with maximum 9 LED. The results are 7,144mW and 8,534 mW.

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