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All Journal Jurnal Teori dan Aplikasi Fisika
Amilia Rasitiani
Universitas Lampung
Materials Science & Nanotechnology Physics

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Synthesis of Superconductor Bi1,6Pb0,4Sr2Ca2Cu3O(10+x) for Meissner Test Demonstration Using Solid Reaction Method Liyana Mardova; Amilia Rasitiani; Dwi Asmi; Leni Rumiyanti; Sigit Dwi Yudanto
Jurnal Teori dan Aplikasi Fisika Vol 8, No 2 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i2.2592

Abstract

The research has been done in the field of Field Work Practice to synthesize superconductors Bi1,6Pb0,4Sr2Ca2Cu3O10+x for Meissner test using solid reaction method. The objective of this research is to make superconductor Bi1,6Pb0,4Sr2Ca2Cu3O10 x with solid reaction method and to know the result of superconducting character of Bi1,6Pb0,4Sr2Ca2Cu3O10 +x based on Meissner test. From the results of Meissner test that has been done on this superconductor sample looks super magnet and superconductor repel each other rejects or super magnet drift.Sehingga it can be concluded that the sample has a strong Meissner effect. From the results of Tc test using cryogenic tools obtained Tc Zero temperature of 103.4 K and Tc Onset of 116.67 K. From the data obtained it can be concluded that the sample has reached phase 2223.
Pengaruh Konsentrasi Ekstrak Kulit Buah Maja (Aegle Marmelos (l.) Corea) terhadap Laju Korosi Baja Karbon API 5L pada Medium NaCl 3% dan H2SO4 3% amilia rasitiani; Ediman Ginting; Pulung Karo karo
Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i2.1837

Abstract

A study has been conducted on the extract concentration effect of Maja Peel as an inhibitor of low carbon API 5L in corrosive medium of NaCl 3% and H2SO4 3%. The soaking process of low carbon API 5L was done for 35 days with variation of addition inhibitor concentrations at 0%, 0,4%, 0,5%, 0,6%, 0,7%, and 0,8%. The testing of Corrosion rate is done by weight loss method. The results showed that the highest corrosive rate in corrosive medium of NaCl 3% and H2SO4 3% was at 0% which is inhibitor concentration, 0,06 x 104 mm/y and 16,55 x 104 mm/yconcentration. Meanwhile, the lowest corrosion rate at 0.8% inhibitor concentration for corrosive medium ofNaCl 3% and 0.5%for H2SO43% corrosive medium. Hence, the greatest effectiveness of corrosion occurs at the concentration of 0.8% in a corrosive medium of NaCl 3% with effectiveness of  85,71% and 0.5% in corrosive medium of H2SO4 3% with the effectiveness of 79.35%. The characterization result of X-Ray Diffraction (XRD) shows that the phase formed is pure Fe. Characterization of Scanning Electron Microscopy (SEM) showed uneven clusters and smaller sizes, holes and cracks also with less than 0.8% inhibitors for corrosive medium of NaCl 3% and 0.5% for corrosive medium of H2SO43% compared with 0% inhibitor of maja peel extract on corrosive medium ofNaCl 3% and H2SO4 3%. Characterization of Energy Dispersive Spectroscopy (EDS) in samples with corrosive medium of H2SO43% obtained the element S (Sulfate)
Skrinning Fitokimia Ekstrak Daun Sirsak (Annona muricata) Dan Pengaruhnya Terhadap Laju Korosi Baja Karbon ST 37 Leni Rumiyanti; Amilia Rasitiani; Ediman Giting Suka
Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i1.1917

Abstract

Research has been conducted on a phytochemical screening of soursop leaf extract (Annona muricata) and its effect on the corrosion rate of ST 37 carbon steel. Extraction of soursop leaves was carried out by the maceration method, while corrosion rate testing was carried out by weight loss method. ST 37 carbon immersion was carried out for 10 days with 7 variations of concentration, namely 0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%. The results of phytochemical screening showed that the soursop leaf extract contained saponins, triterpenoids, tannins, alkaloids, and flavonoids. The greatest corrosion rate was obtained at a concentration of 0%, which was 1.3 x 104 mm / y, while the lowest corrosion rate was at a concentration of 30%, which was 0.032 x 104 mm / y. The greatest corrosion inhibition efficiency occurred at a concentration of 35% at 97.53%. Based on the results of the reaserch, it can be concluded that the higher the concentration of soursop leaf extract used, the lower the corrosion rate and the higher the inhibition efficiency of the corrosion
Co-Authors Dwi Asmi Ediman Ginting Ediman Giting Suka Leni Rumiyanti Mardova, Liyana Pulung Karo-Karo Sigit Dwi Yudanto