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Leni Rumiyanti
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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 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
Analisis Jeruk dan Kulit Jeruk sebagai Larutan Elektrolit terhadap Kelistrikan Sel Volta suci asmarani; Sri Wahyu Suciyati; Amir Supriyanto
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.v7i1.1919

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.
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
Pengaruh waktu sintering Terhadap tingkat kemurnian fase Superkonduktor BPSCCO-2223 dengan Kadar Ca 2,10 Menggunakan Metode Pencampuran Basah Isnaini Rahayu; Suprihatin Suprihatin; Agus Riyanto
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.v7i1.1931

Abstract

Research about the effect of sintering time on the phase purity level of superconductor BPSCCO-2223 at the level of Ca 2,10 has been synthesized using the wet-mixing method. Synthesis carried out by slowly dissolving HNO3 and aquades then gradually for 40 hours dried out at a temperature of 300, 400, 600 °C. The sample was calcined for 10 hours at 800 °C and sintered using variations of time 10, 20, 30, and 40 hours at 865°C. Variations were carried out to determine the effect of sintering time on the purification of the superconductor. XRD result shows a decrease in phase purity with increasing the sintering time. Volume fraction that is relatively high at BPSCCO-2223/ts10 is 88,88%. While the lowest volume fraction of BPSCCO-2223/ts40 is 71,51%. The relative high orientation degree of BPSCCO-2223/ts30 is 33,76% and the lowest orientation degree of BPSCCO-2223/ts20 is 22,21%. The SEM result shows that all samples have layers arranged (oriented) by empty spaces between the plate (void) is relatively small.
Inhibisi Korosi Ekstrak Buah Pinang (Areca catechu L.) Sebagai Penghambat Laju Korosi Pada Baja Karbon Rendah C-Mn Steel dengan Medium Korosif HCl dan NaCl nika khumaidah; Ediman Ginting Suka; Syafriadi Syafriadi
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.v7i1.1921

Abstract

Corrosion inhibition of areca nut extract (Areca catechu) as the resistor of corrosion rate in low carbon steel with HCl and NaCl corrosive medium concentrated at 3% had been reasearched. The C-Mn steel corrosion rate was examined during a 96 hours of submersion with and without the addition of areca nut extract with the concentration rate at 10%, 15%, and 20% respectively. The examination was done with the weight loss method. The result of the research shows that the use of higher the concentration of areca nut extract resulted in the decrease of corrosion rate and the increase of corrosion inhibition capability. The highest rate of corrosion effectiveness was found in the 20% concentration in both HCl and NaCl with the rate of 86,06% and 85,62% respectively. The result of X-Ray diffraction (XRD) characterization showed that the phase formed was pure Fe. Scanning Electron Microscopy (SEM) characterization showed uneven clusters with smaller size. Holes and cracks were not formed that the corrosion rate was lower compared to the sample without inhibitor addition. The characterization Energy Dispersive Spectroscopy (EDS) in the sample without inhibitor showed the presence of Cl substance.
Pengaruh Temperatur terhadap Karakterisasi Klinker Semen dengan Substitusi 20% Batu Basalt terhadap Massa Batu Kapur dan 20% Batubara terhadap Massa Total sebagai Reduktor Leni Rumiyanti; Yuliana Sari; Muhammad Amin
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.v7i1.2141

Abstract

This study was conducted to determine the effect of temperature on the chemical content and crystal structure on clinker of cement with 20% substitution of basalt stone on the mass of limestone and 20% of coal against total mass. The raw material used is basalt stone from East Lampung and anthracite coal. The percentage of limestone used is 80%. All raw materials are milled, sifted, then formed pellets with a diameter of 0.8 - 1.4 cm. Pellets are dried at room temperature, then heated and burned with temperature variations of 1000 ° C, 1100 ° C and 1200 ° C for 1 hour. XRF results showed that basalt rock had a content of SiO2 + Al2O3 + Fe2O3 of 79.293% so that basalt could be said to have pozzolanic properties. The CaO content for cement clinker decreased, the results of XRF with combustion temperatures of 1000 ° C, 1100 ° C and 1200 ° C respectively were 62,329%, 55,606%, and 54,148%. Materials A, B and C respectively were burning at 1000°C, 1100°C, and 1200oC for 1 hour. The crystalline phase formed in material A is calcium iron oxide with the highest peak belonging to Ca at position 2θ which is 26.6627° and another crystal phase, gehlenite, syn. The crystalline phase formed in material B is akermanite-gehlenite syn with the highest peak belonging to Ca at position 2θ which is 31.2747° and other crystalline phases namely and wollastonite, ferroan 1A. While the crystalline phase formed in material C is akermanite-gehlenite with the highest peak belonging to Ca at position 2θ which is 31.3051° and syn and other crystalline phases namely wollastonite, ferroan 1A.
Studi Desain High Temperature Gas-Cooled Reactor (HTGR) Berpendingin Gas Hidrogen Menggunakan Bahan Bakar Thorium Dika Riyan Saputra; Yanti Yulianti; Agus Riyanto
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.v7i1.1932

Abstract

The Research of design reactor HTGR cell core with thorium fuel and hydrogen gas cooled using SRAC program has been done. The reactor was designed to generate maximum thermal power and critical conditions. The parameters on this study are fuel enrichment, atomic density, size and configuration of reactor core, criticality and the distribution of power density. Reactor core calculation was done in two dimensional core (x,y) at 1/6 part of the reactor core with a triangular mesh. The fuel was Th232 and U233, and hydrogen as coolant. In this study, the ideal reactor core design was length (x) was 428 cm and width (y) was 214 cm, the first fuel enrichment was 6,037% and second fuel enrichment was 8%. Reactor core design in this study generated 60 MWth thermal power with maximum power density was 179,6747 Watt/cm3 which is located at x=1, y=18 point and effective multiplication (keff) is 1,000005.
Pengaruh Suhu Sintering Terhadap Tingkat Kemurnian Fase Superkonduktor BPSCCO-2223 pada Kadar Ca 2,10 Menggunakan Metode Pencampuran Basah Rizki Putri Surahman; Suprihatin Suprihatin; Agus Riyanto
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.v7i1.1926

Abstract

Sintering temperature has an effecton the purity level BPSCCO-2223 superconductor phase. This study has been conducted using the wet-mixing method with the materials used are Bi2O3, PbO, SrCO3, CaCO3, CuO, NHO3 and aquades. Synthesis carried out by slowly dissolving HNO3 and aquades then gradually for 40 hours dried out at a temperature of 300, 400, 600 °C. The sample was analysed with calcination for 10 hours at 800 °C and sintering for 20 hours using variations of temperature on each 850, 855, 860, and 865 °C. The XRD results show that phase purity which increases with increasing sintering temperature. The relative high volume fraction of the BPSCCO-2223-865 sample is 87,20% while, the lowest volume fraction of BPSCCO-2223-850 is 58,25%. The relative high orientation degree of BPSCCO-2223-855 is 27,64% and the lowest orientation degree of BPSCCO-2223-860 is 21,16%. The SEM result shows that all samples have layers arranged (oriented) by empty spaces between relatively small plaque (void).
Pengaruh Penambahan Inhibitor Ekstrak Kulit Kakao (Theobroma cacao) terhadap Laju Korosi Baja Api 5 L pada Medium NaCl 3% dan HCl 3% Liyana Mardova; Ediman Ginting Suka; Simon Sembiring
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.v7i1.1924

Abstract

Corrosion inhibition of low carbon API 5L by cocoa peel extract (Theobroma cacao) in corrosive medium of natrium chloride and hydrochloride acid of 3% has been investigated. The test was carried out by weight loss method. Corrosion rate was tested on low carbon steel with and without the tea leaves extract for 4 days with concentration of 0, 500, 1000, and 1500 ppm. The research result show that the more percentage of cocoa peels inhibitor extract, the lower corrosion rate so that capability of inhibition will increase. The biggest inhibition efficiency corrosion occurred at concentrations of 1500 ppm in NaCl and HCl with efficiency of 93,39% and 73,6% respectively. The X-Ray Diffraction (XRD) result shows that the phase was Fe. Scanning Electron Microscopy (SEM) shows that the grain size and cluster is bigger, hole and crack also shows is lower of with inhibitor than without inhibitor. Energy Dispersive Spectroscopy (EDS) shows that there is Cl element on sample without inhibitor.
Desain Teras Reaktor High Temperatur Gas-Cooled Reactor (HTGR) Model Mesh Triangular Dua Dimensi Berbahan Bakar Thorium Berpendingin Gas CO2 Nasta Melia Dilaga; Yanti Yulianti; Agus Riyanto
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.v7i1.1933

Abstract

The research of design reactor HTGR cell core with two dimensional triangular mesh model using thorium fueled and CO2 coolant has been done. Objective of the research was design critical condition of HTGR cell core so as obtained critical condition and high thermal power. The neutronic analyzed by CITATION of SRAC on 1/6 of reactor cell core. The parameter which analyzed were core fuel enrichment, size and configuration reactor cell core, critically and power density. The result was obtained the ideal reactor design with size (x) 202 cm and (y) 101 cm. The enrichment of first region was 3% and second region was 2.731%. The total thermal power of reactor was 100 MWth, maximum power density of reactor was 107.5371 Watt/cc and keff of reactor was 1.000008.
Efektivitas Ekstrak Daun Pepaya (Carica papaya L.) sebagai Inhibitor pada Baja Karbon AISI 1020 dalam Medium Korosif NaCl 3% Repangga Yudi Aditama; Ediman Ginting Suka; Syafriadi Syafriadi
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.v7i1.1927

Abstract

Papaya leaf extract used as an inhibitor in carbon steel sample AISI 1020, was immersed in a 3% carboxy NaCl medium. By varying the immersion time of 4 days and 8 days, and also the concentration of inhibitor 0%, 3%, 5% and 7%. After the treatment of the sample obtained the slowest corrosion rate calculation results in AISI 1020 4.5 samples and the fastest in the AISI 1020 8.7 sample. The inhibitor used has the most efficient efficiency value in the AISI 1020 4.5 sample and the inefficient value in the AISI 1020 4.7 sample. The XRD characterization results show that the crystalline structure formed is BBC with pure Fe phase. The SEM characterization shows the surface morphology of the steel sample, visible in the sample without the addition of more inhibitors than the sample with the added inhibitor. In addition, cracks do not appear on the AISI 1020 4.5 sample. Characterization of EDS in the sample seen elements of Oxygen (O) and Clorin (Cl) which indicates that the sample has been corroded.

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