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Pengaruh Ethanolamina Terhadap Pembentukan Fasa, Ukuran Partikel, dan Luas Permukaan Spesifik Nanotitania Menggunakan Metode Sol Gel Renita Maharani Fauzi; Posman Manurung; Yanti Yulianti
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2716

Nanotitania has been prepared by sol gel method using ethanolamine as surfactant. This research was conducted to determine the effect of ethanolamine on the phase formation, particle size and surface area of TiO2. In this study Ti-butoxide was used as a precursor and ethanol as a solvent, and then HCl. The amount of ethanolamine was varied to 0; 0.5; 1; 1.5; and 2 ml. The samples were calcined at a temperature of 500ºC for 4 hours. TiO2 was characterized using X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and Surface Area Analyzer (SAA) with BET method. The results of XRD characterization showed that in samples A-0.0 and A-0.5 an anatase phase was formed, whereas in the sample A-1,0 and A-1,5 an anatase, brookite, and rutile phases were formed with a weight percentage of 57,65 ± 1,6% wt; 27,06 ± 1,8% wt, and 15,29 ± 0,4% wt. Meanwhile, for sample A-1,5 it is 69,96 ± 1.6% wt, 24,52 ± 1,5% wt, and 5,52 ± 0,3% wt. Sample A-2.0 only produced anatase and brookite phases with weight percentages of 78,53 ± 1.5% wt and 21,47 ± 1.5% wt. The results of TEM characterization using ImageJ software show that the TiO2 particle size in sample A-1,0 was 15,8 ± 1,0 nm. The results of the analysis surface area of sample A-1, produced the largest specific surface area, that is 172 m2/g, the smallest specific surface area was produced in sample A-1,5 that is 72,07 m2/g.

Analisis Kecelakaan Reaktor Transient Over Power (TOP) Reaktor SCWR (Supercritical Cooled Water Reactor) Abdullah Haris; Yanti Yulianti; Syafriadi Syafriadi
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1828

Research about TOP reactor accident analysis for SCWR reactor used thorium fuel has been done. The objective of this research is to solve point reactor kinetic equation by Taylor method and to analyze TOP reactor accident. Point reactor kinetic equation has first order differential equation to calculate relative power behavior due to reactivy which can be solved with MATLAB program. Initial reactivity used three variation these are 0,0025; 0,00315; and 0,005. The analysis results showed exponential pattern for reactivity without feedback had obtained power density was 5314,72 Watt/cm3 and fuel temperature was 13717,5 K at t = 1 s. While on reactivity used feedback has given stable conditions had obtained power density was 204,765 Watt/cm3 and fuel temperature was 636,1 K at t = 1 s.

Pengaruh Ethanolamina (MEA) dalam Pembentukan TiO2 dari Bahan Awal Ti Butoksida Rika Rahayu; Posman Manurung; Yanti Yulianti
Jurnal Teori dan Aplikasi Fisika Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i2.1946

Titanium dioxide has been prepared through the sol gel method using the addition of ethanolamine. The research was conducted to study the effect of MEA on the formation of TiO2. The amount of MEA was varied to 0; 0.5; 1; 1.5; and 2 ml respectively. The samples were calcined at a temperature of 500 ºC. TiO2was characterized using X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and photocatalyst tests using UV lamps. The XRD characterization results showed that in the A sample an anatase phase was formed whereas in the Csample an anatase phase and a brookite phase were formed. The resultof TEM characterization using ImageJ software show that the particle size of TiO2 is26,1 nm, respectively. The results of the characterization of the fastest photocatalyst catalyst test occurred in sample C which the variation of MEA is 1 ml.

ANALISIS DINAMIKA MOLEKUL PROTEIN LYSOZYME PUTIH TELUR DENGAN MODEL POTENSIAL LENNARD-JONES MENGGUNAKAN APLIKASI GROMACS harry prayoga; Yanti Yulianti; Agus Riyanto
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.v6i2.1849

The molecular dynamic analysis oflysozyme protein has been done using Gromacs application. Lysozyme protein filled by water in the cubic form with variation of temperature was 300 K, 325 K, and 350 K and calculatedpotential energy values used Lennard Jones equation. Structure protein on temperature was 300 K showed that pressure value was 2,54 barand density value was 997,54 kg/m3 then protein changed in unfolded state on ARG21-CA and SER81-CAamino acid chain with potential energy was 2992,14 kJ/mol . Structure protein on temperature was 325 K showed that pressure value was 4,84 barand density value was 974 kg/m3 then protein changed in unfolded state on ASP101-CA and GLN121-CAamino acid chainwith potential energy was 2994,55 kJ/mol.Structure protein on temperature was 350 K showed that pressure value was 0,82 barand density value was 948,747 kg/m3 then protein changed in unfolded state on ARG21-CA amino acid chain and lost on GLN121-CA amino acid chainwith potential energy was 2994,55 kJ/mol. Root Mean Standard Deviation (RMSD) showed that the protein will be denaturated on temperature 350 K caused bylost on GLN121-CA amino acid with distance was0.07 nm.

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

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.

Desain Inti Reaktor SCWR (Supercritical Water Reactor) Model Teras Silinder (r, z) dengan Bahan Bakar Thorium Hasil Daur Ulang Setiyaningsih Setiyaningsih; Yanti Yulianti; Simon Sembiring
Jurnal Teori dan Aplikasi Fisika Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i2.1956

The Research of the supercritical water reactor (SCWR) core design of the cylindrical core model (r, z) using the SRAC program has been done. The SRAC basic code was PIJ and CITATION. PIJ was used to calculate the fuel level and CITATION was used to calculate the reactor core level. The calculation of the reactor core has been done on the 1/4 cylinder core (r, z) and the geometry of the fuel cell was the cylindrical cell. Reactor fuel material was thorium burned 40 GWd/t and 30 GWd/t. The neutron parameters in this research were fuel enrichment, burn up, reactor core size, reactor core configurations, multiplication factor, and power density distribution. Multiplication factor (k-effective) in this research was 1.000004, which is reactor was in a critical condition. The reactor core in critical condition had the size of radius (r) was 130 cm, height (z) was 270 cm and fuel enrichment 2.8262%. The maximum power density was 130.0808 Watts /cm3 which was located at a radius of 25 cm and 135 cm high. The peak power factor in the radial direction was 1.6063 and the peak power factor in the axial direction was 1.3189.

PERHITUNGAN LAJU REAKSI NEUTRON MODEL PERANGKAT ANNULAR PADA JENIS REAKTOR SCWR (SUPERCRITICAL WATER REACTOR) BAHAN BAKAR THORIUM ismatul lisa; Yanti Yulianti; Syafriadi Syafriadi
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.v6i2.1847

The calculation of fission reaction rate and capture reaction with and without filters have been done using the REACT of SRAC. The calculation of fission rate on fuel 1 and 2 were 5,39 x 10-2 reaction/cm3s with filter and 6,35 x 10-2 reaction/cm3s without filter, then of capture reaction rate with filter on fuel 1 and 2 were 2,91 x 10-2 reaction/cm3s, without filter on fuel 1 was 3,9 x 10-2reaction/cm3s and fuel 2 was 3,78 x 10-2 reaction/cm3s. The calculation of capture reaction on cladding with filter was higher than without filter was 2,15 x 10-3 reaction/cm3s, on moderator with filter was lower than without filter was 3,18 x 10-3 reaction/cm3s. The highest neutron spectrum with 1% enrichment of experiment 1 in thermal energy was 6,31 x 10-6 MeV-1 and in fast energy was 6,44 x 10-6 MeV-1, and decreased constantly. Meanwhile of experiment 2, neutron spectrum in thermal energy was 1,37 x 10-5 MeV-1 and in fast energy was 6,91 x 10-6 MeV-1, and decreased significantly from 1% to 2% enrichment then decreases constantly until 5% enrichment

THE INFLUENCE OF ELECTRICAL VOLTAGE ON FORMATION OF SILICA NANO FIBER WITH ELECTROSPINNING METHOD Erika Sempana Ginting; Posman Manurung; Yanti Yulianti
Jurnal Teori dan Aplikasi Fisika Vol 10, No 1 (2022): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v10i1.2907

Silica nanofibers have been successfully fabricated using electrospinning method. Silica solution was prepared with molar rasio of tetraethyl orthosilicate (TEOS): ethanol: aquabides:hydrogen chloride (HCl) of 1 : 10 : 3 : 0.04. Polyvinyl alcohol (PVA) of 10% was added to solution. The solutions were then mixed with a ratio of silica: PVA solution of 2: 3 ml. The functional group of silica/PVA was characterized by Fourier transform Infrared Spectroscopy (FTIR). Morphology and elements analysis was tested by Scanning Electron Microscopy - Energy Dispersive Spectroscopy (SEM - EDS). The functional groups of silica/PVA solution formed are –OH, C-H, CH2, C=O, Si-O, and Si-O-Si which indicate the occurrence of cross-linking between silica and PVA. The functional groups shown in the solution are still visible on the silica nanofibers in the presence of C, O, and Si elements in the EDS results of the nanosilica fibers. The surface morphology shows that the silica nanofibers are more continuous and the beads are relatively less with increasing electrospinning voltage. The average fiber diameter by taking into account the estimated standard deviation, shows a graph with a linear trend and increasing the applied electrospinning voltage. Silica nanofibers with diameter range (80-150) nm are obtained

Studi Perhitungan Laju Reaksi Neutron Dalam Reaktor SCWR (Supercritical Water Reactor) Model Perangkat (Assembly) Heksagonal Berbahan Bakar Thorium Apriliana Apriliana; Yanti Yulianti; 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.v6i2.1844

The calculation of fission and capture reaction rate with and without filter has been done using REACT of SRAC. In material 1 fission reaction rate with and without filter were increased by increasing percent of U233. The highest fission reaction rate with filter was 5,7194x10-2reaction/cm3sand without filter was 6,1361x10-2 reaction/cm3s. Meanwhile capture reaction rate with and without filter were decreased by increasing percent of U233. The highest capture reaction rate with filter was 2,2156x10-2 reaction/cm3s and without filter was 2,4906x10-2 reaction/cm3s. In material 3, fission and capture reaction rate with and without filter were decreased by increasing percent of U233 in material 1. The highest fission reaction rate with filter was 1,5218x10-2 reaction/cm3s and without filter was 1,6293x10-2reaction/cm3s. The highest capture reaction rate with filter was 2,2156x10-2 reaction/cm3s and without filter was 2,3993x10-2reaction /cm3s. Neutron reaction rate with filter was smaller than neutron reaction rate without filter

Efektivitas Ekstrak Daun Gambir Sebagai Inhibitor Pada Baja Karbon API 5L dengan Perlakuan Panas Menggunakan Larutan NaCl 3% Ilwan Pusaka; Ediman Ginting Suka; Yanti Yulianti
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.v5i2.1412

Abstract.The effectiveness of uncaria gambir leaves extract as inhibitor on carbon steel API 5L with heat treatment in NaCl 3% had been researched. The research was done by weight loss. Corrosion rate had been tested on carbon steel API 5L with heat treatment and carbon steel without heat treatment in NaCl 3% added by soursop leaves extract inhibitor for 168 hours with concentrations of 0%, 2%, 4%, and 6%. The result showed at carbon steel API 5L with and without heat treatment corrosion rate higher at concentration inhibitor 0% that is 0,051 mm/y. While corrosion rate lower at concentration inhibitor 2% that is 0,03%. Until, Efficiency higher at carbon steel API 5L with and without heat treatment in concentration inhibitor 2% that is 61,63% and 66,43%. The X-Ray Diffraction (XRD) characterization result showed at carbon steel API 5L with heat treatment that the phase formed is martensite. At carbon steel API 5L with heat treatment that the phase formed is pure Fe. Scanning Electron Microscopy (SEM) characterization at carbon steel API 5L with heat treatment showed even clusters and larger size, holes, cracks and grain boundary in the surface. At carbon steel API 5L without heat treatment showed uneven clusters and smaller size, holes, cracks, but grain boundary not showed in the surface. Energy Dispersive Spectroscopy (EDS) characterization on sample with inhibitor 0% obtained Cl element and Oxygen larger than inhibitor 2%. Key words:Carbon steel API 5L, soursop leaves extract, corrosion inhibitor, NaCl and heat treatment

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