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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 15 Documents
Search results for , issue "Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
Sintesis Superkonduktor BSCCO-2223 dengan Variasi Waktu Sintering pada Kadar Ca=2,10 Menggunakan Metode Pencampuran Basah Siti Istikomah; Suprihatin Suprihatin; Agus Riyanto
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.v7i2.1980

Abstract

Research about the effect of sintering time on the phase purity level of superconductor BSCCO-2223 at the level of Ca 2,10 has been synthesized using the wet-mixing method. Sample dissolved is slowly with HNO3 and aquades, then drying gradually 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 results show that sintering time has an effect on the volume fraction value of BSCCO-2223. Volume fraction that is relatively high at  30 hours sintering time is 79,17 % with an orientation degree value of 37.94%. While the lowest was obtained at the time of sintering for 10 hours with the volume fraction of 38.47% with a degree of orientation of 15.27%. the SEM results show that all samples have layers oriented and have relatively little space between the plates (voids). 
Pengaruh Penambahan Inhibitor Ekstrak Kopi Dan Waktu Perendaman Terhadap Laju Korosi Pada Baja Karbon Aisi 1020 Dalam Larutan Nacl 3% Hartono Simanjuntak; Ediman Ginting; Suprihatin Suprihatin
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.v7i2.2109

Abstract

Ekstrak kopi yang digunakan sebagai inhibitor pada sampel baja karbon AISI 1020, direndam dalam medium korosif NaCl 3%. Dengan memvariasikan waktu perendaman 4 hari dan 8 hari, dan juga konsentrasi inhibitor 0%, 3%, 5% dan 7%. Setelah perlakuan pada sampel diperoleh hasil perhitungan laju korosi yang paling lambat pada sampel AISI 1020 8.7 dan yang paling cepat pada sampel AISI 1020 4.0. Inhibitor yang digunakan mempunyai nilai efisiensi paling tinggi pada sampel AISI 1020 4.7. Hasil karakterisasi XRD menunjukkan bahwa struktur kristal yang terbentuk merupakan fasa Fe murni. Karakterisasi SEM menunjukkan morfologi permukaan sampel, terlihat gumpalan pada sampel. Karakterisasi EDS pada sampel terlihat unsur Oksigen (O) yang mengindikasikan bahwa sampel telah terkorosi.
Pemanfaatan Biomassa Sebagai Inhibitor Organik Pada Baja Aisi 1020 Di Universitas Lampung Rizky Damayanti; Pulung Karo Karo; Agus Riyanto
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.v7i2.2055

Abstract

Research has been conducted on. The utilization of biomassa as an organic inhibitor in AISI 1020 steel at Lampung University. Samples of carbon steel AISI 1020 were immersed in 3% corrosive medium HCl without being given and given inhibitors of leaf extract  jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. inhibitors of leaf extract  jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of Biomasaa inhibitors was effective in reducing the corrosion rate of the samples with the greatest efficiency in the soaking of 7 days of ketapang leaves, which was equal to 74.22%. The results of XRD characterization showed that the phases formed were Fe and Fe2O3 in samples coated with inhibitors and in samples soaked without phase inhibitors Fe2O3 which were corrosion products. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion in the inhibitor contained thin layers overlaying the steel in the sample not coated with the inhibitor, clearly visible cracks and holes indicating that the sample had undergone corrosion.
Rancang Bangun Mobile Infant Warmer dengan Menggunakan Pemanas DC Bayu Wahyudi; Mohamad Miftahudin; Iqbal Firdaus
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.v7i2.2143

Abstract

Infant warmer is one of the tools used to provide comfort and warmth to newborns, where the baby needs a temperature that is in accordance with the temperature in the mother's womb, which is between 34ºC - 37ºC. This tool is made so that a newborn baby can feel the temperature outside the mother's womb will be the same as the temperature that is in the mother's womb. Until now, infant warmer still has to be connected to the PLN nets to activate it. This study aims to create and design infant warmers with DC pemanass equipped with batteries so that when the electricity dies by the PLN this tool can still be used. Data analysis results for power supply output, 12V pemanas input measurement is 11.9V with 0.8% error and 11.8V with 1.6% error, still within the tolerance limit of 5%. The measurement results of temperature comparison between DS18B20 sensor and thermometer, have an average difference of 0.3ºC or 1% error, so that it is still within reasonable limits. This tool has a maximum electric power of 36 Watt which saves power usage around 80%. Compared to a real device where the power needed is around 200 Watts to 300 Watt.
Pengaruh Variasi Konsentrasi Ekstrak Daun Alpukat (Persea americana M.) Sebagai Inhibitor Pada Baja Tahan Karat SS-304 Dalam Medium Korosif HCl 1M Windy Mustika Sari; Syafriadi Syafriadi; Ediman Ginting Suka
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.v7i2.1949

Abstract

Avocado leaves extract (Persea americana M.) is used as an inhibitor to the sample of  SS-304 Stainless steel which cures in HCl 1M Corrosive Medium for 168 hours, the inhibitor concentration variation added 0%, 2%, 4%, 6%, 8% and  10% respectively. The rate sample is measured by using lose-weight method. The results show the lowest samples is 0,37 mm/y of 6%  and the highest 10,75 mm/y of 0%. Inhibitor efficiency to the sample SS-304 Stainless steel potrays the effectively progress to 96,55% with  6% concentration. X-Ray Diffaraction Results accquired BCC and FCC  with Fe-a dan Fe-g phase along with SEM that forms agglomeration, cracked, and hole which result on its corrosion. In addition EDS contains Oxygen (O) and Chlorine (Cl) Element which indicate that stainless still has affected by corrotion. Thus from three samples which characterized and measured show that avocado leaves effectively as an inhibitor to the sample SS-304 stainless steel in HCl 1M corrosive medium
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

Abstract

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.  
Pengaruh Variasi Konsentrasi HCl Pada Pembentukan Nanosilika Berbasis Batu Apung Lusi Vusfita Sari; 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.v7i2.1945

Abstract

The aims of this research is to determine the effect of variation concentration of HCl on chemical composition, phase formed, and particle size on pumice powder. Nanosilica is made using the solgel method with NaOH concentration 4 M, H2SO4 5 M and variation concentration of HCl 0,5; 0,75; 1; 1,25 dan 1,5 M. The XRF results showed the greatest chemical composition value in the silica pumice powder sample with a value of 77.80%. This value is higher after synthesis at the highest chemical composition value in the nanosilica sample 1,25 M HCl concentration of 87.05%. The XRD results show a diffractogram of pumice powder samples formed by anorthite and albite phases while in the nanosilica sample 1,25 M HCl concentrates are debated with the amorphous phase. The TEM results show particle size of nanosilic sample 1,25 M HCl concentration is 5 nm with average particle size (12.02 ± 3.23) nm.
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

Abstract

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.
Penentuan Indeks Bias Kaca Berdasarkan Pola Interferensi Cahaya Laser Terhambur Menggunakan Cermin Datar “Berdebu” Rossy Lydia Ellyana; I Wayan Angga Wijaya Kusuma
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.v7i2.2150

Abstract

Experiment on Interference Pattern of Laser Light Scattered Analysis using a "Dusty" Plane Mirror aims to determine the glass refractive index value. The dust samples used in this experiment are baby powder, chalk, rice flour, wood powder and beauty powder. The dust samples sprinkled over a clean mirror, so it will produce an interference pattern that can be seen on the screen. The results of the interference pattern are circular because the screen is perforated with a diameter of 0.01 m. Dust particle sample variation only affects the brightness level of interference patterns. Analysis of interference patterns using red laser pointers or green laser pointers will get the brightest interference patterns when using baby powder compared to other dust samples. Based on the resulting interference pattern, the refractive index value of the glass using a red laser pointer is 1.62 ± 0.04 and the weighted average value of the glass refractive index is 1.68 ± 0.02, whereas the refractive index value of glass using a green laser pointer is 1.74 ± 0.07 and the weighted average value of the refractive index of the glass is 1.79 ± 0.02
Pengaruh Variasi H2SO4 Pada Pembentukan Nanosilika Berbasis Batu Apung Riska Trisna Nuraini; Posman Manurung; Suprihatin Suprihatin
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.v7i2.1954

Abstract

Nanosilica was extracted by using NaOH, H2SO4 and HCl. The amounth of NaOH and HCl are 3,0 M and 1,0 M respectively. The titration using H2SO4 was varied of 4,0 M; 4,5 M; 5,0 M; 5,5 M; 6,0 M. The pumice powder was calcined for 4 hours at 500 ºC and the nanosilica powder was calcined for 5,5 hours at 800 ºC. The results of X-Ray Flouresence (XRF) showed nanosilica with the highest purity in variation of H2SO4 5,0 M at 95,32%. The results of the X-Ray Diffractometer (XRD) showed that pumice consistent the anorthite and albite phase. The variation of H2SO4 5,0 M produced an amorphous phase. The results of Transmission Electron Microscopy (TEM) show nanosilica particle size with variations of H2SO4 5,0 M in the range 4,8-11,3 nm with an average (7,62 ± 2,15) nm.

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