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Leni Rumiyanti
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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).
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Articles 2 Documents
Search results for , issue " Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika" : 2 Documents clear
Analisis dan Karakterisasi Kandungan Silika (SiO2) sebagai Hasil Ekstraksi Batu Apung (Pumice) Trianasari, Trianasari; Manurung, Posman; Karo Karo, Pulung
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1814

Abstract

The study of silica from pumice was done by extraction method using NaOH, H2SO4, and HCl. Powder of pumice before extraction was calcined at 450oC for 4 hours. The extraction powder was calcined at 800 °C for 3 hours. The powder before and after the extraction were characterized by XRD and SEM-EDS. Sample also characterized by DTA-TGA analysis before extraction and after extraction was analyzed by TEM. XRD pattern powder of pumice dominated by amorphous silica. The results have been confirmed with SEM-EDS showing that the silica content has the highest percentage, ie 65.88% for the sample before extraction and 78.95% for the sample after extraction. From the TEM observation it shows spherical particles, with particle size of 5.8 ± 0.2 nm. DTA-TGA analysis for pumice powder shows the occurrence of endotherm and exothermic events accompanied by mass shrinkage along with warming temperature rise.
Desain dan Realisasi Akumulator Elektrolit Air Laut Dengan Penambahan Sodium Bicarbonate (NaHCO3) Sebagai Sumber Energi Alternatif Arwaditha, Randha Kentama; Pauzi, Gurum Ahmad; Supriyanto, Amir
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1809

Abstract

It has been done an instrument of generating electric power by using a series of Cu-Zn electrode with sea water electrolyte and with the addition of NaHCO3. The instrument was desined to charging and discharged sea water electrolyte that can be used as a sustainable alternative energy source. The first instrument with sea water electrolyte was tested in 78 hours with three times electrolyte charging every 24 hours.Voltage, Current, Power, and Illumination were generated by an instrument with sea water electrolyte, the longer used will be smaller and can only turn the LEDs of 1.2 watts for 3 days. While the sea water with electrolytes added NaHCO3, the longer used will be smaller too, and they can turn on the LED 1.2 watts to 5 days. Corrosion rate with the longer electrolytic sea water used will be higher, while the sea water with electrolytes added NaHCO3 no corrosion Occurs.

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