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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

Abstract

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
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
Variasi Doping Pb terhadap Pertumbuhan Fase Bahan Superkonduktor Bi-2212 pada Kadar Ca 1,10 dan Suhu Sintering 830°C suprihatin suprihatin; Riandini Pratiwi; Syafriadi Syafriadi
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.v5i2.1494

Abstract

Abstract. Research on the effect of Pb doping is 0; 0.1; 0.2; 0.3 and 0.4 to the phase growth of the Bi-2212 Ca 1,10 superconducting material was carried out by the solid method at a calcination temperature of 800°C for 10 hours and sintering temperature of 830°C for 20 hours. The effect of Pb doping on the phase growth of superconducting material can be seen by volume fraction, impurity, and degree of orientation. The results showed that samples without doping Pb (Pb 0) had lower volume fraction values than samples with doping Pb (Pb 0.1-0.4). Addition of Pb doping (Pb 0.1-0.4) will increase the volume fraction. The highest volume fraction (Fv) in doping Pb 0.4 was 80.99%, whereas the lowest volume fraction on doping Pb 0.1 was 67.73%. Samples without doping Pb (Pb 0) had a lower orientation grade value than samples with doping Pb (Pb 0.1-0.4). The addition of Pb doping 0.1 and 0.4 has a higher orientation degree compared to Pb doping of 0.2 and 0.3. The sample with doping Pb 0,1 has the highest orientation degree value that is 24,87%. Based on the SEM results all the seals have shown layers arranged in a direction (oriented) with empty space between the slab (void) is relatively small.
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

Abstract

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.
Pengujian Gugus Fungsi Silika Berbasis Sekam Padi Dengan Variasi Suhu & Konsentrasi Cetyltrimethylammonium Bromide Sebagai Bahan Baku Mesoporous Silica Leni Rumiyanti; Catur Destiana; Ria Oktaviani; Simon Sembiring; Syafriadi Syafriadi; Ni Luh Gede Ratna Juliasih
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.v9i2.2727

Abstract

Research has been conducted to test silica function groups based on rice husks with temperature variations and concentrations of Cetyltrimethylammonium Bromide as raw materials for mesoporous silica. In this study, rice husk silica was synthesized by alkaline method with variations in CTAB concentrations of 2.0%, 2.5%, 3.0%, 3.5%, and hydrothermal treatments with temperature variations of 120, 130, 145, and 160ºC for 1 hour in an autoclave. Fourier-Transform Infrared (FTIR) results showed the presence of the most dominant clusters, namely Si-O-Si and other groups such as C-H, -H, O-H, and –OH. Therefore, silica-based rice husks can be used as raw materials mesoporous silica
Analisis Termal-hidrolik Reaktor Air Bertekanan (Pressurized Water Reactor) Menggunakan Metode LU Faktorisasi Dewi Efendi; 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.v6i2.1845

Abstract

The Research about Pressurized Water Reactors (PWR) thermal-hydraulics analysis has been done. This reseacrh aim to solve fuel rod heat conduction equation by LU Factorization method and to get thermal-hydraulics parameters such as coolant axial temperature distribution, pressure drops, convection heat transfer coefficient, and fuel rod radial temperature distribution. Heat transfer of the reactors was assumted steady state (time independent) then obtained coolant inlet tempertaure about 300 oC, outlet temperature about 326,6 oC and convection heat transfer coefficient  about 1,43 W/cm2 oC. Pressure drop by friction was 0,423 bar, pressure drop by form was 0,51 bar, pressure drop by gravity was 0,25 bar and total pressure drop was 1,183 bar. While centerline fuel obtained the maximum temperature of fuel rod about 1.589,2 oC and the lowest fuel rod temperature at cladding surface about 360,9953 oC
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.
Efektivitas Ekstrak Kulit Buah Maja Sebagai Inhibitor pada Baja Karbon Aisi 1020 dalam Medium Korosif Nacl 3% dengan Variasi Waktu Perendaman Ismi Nurhayati; Pulung Karo Karo; Syafriadi Syafriadi
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.v8i2.1862

Abstract

Research has been conducted on the effectiveness of maja fruit skin extract as an inhibitor of carbon steel AISI 1020 in a corrosive medium NaCl 3% with variations in immersion time. The samples carbon steel AISI 1020 were immersed in corrosive medium NaCl 3% without being given and given the inhibitor of maja skin extract with a concentration of 0.8% for 5, 15, 25, 35, and 45 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of the maja fruit skin extract inhibitor was effective in reducing the corrosion rate of the sample with the greatest efficiency at 35 days immersion, which was equal to 72.35%. The results of XRD characterization show that the phase formed is pure Fe and Fe3O4 phase which is a corrosion product is immersed without inhibitor. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion was there were cracks, holes, and lumps which indicated that the sample had been corroded. The results of EDS characterization show that in the soaked sample there were corrosion products in the form of FeO compounds whose magnitude increased every time immersion.
Pengaruh Variasi Ion Ag+ terhadap Pembentukan Biofoam Antibakteri Berbasis Pati Singkong dan Selulosa Batang Jagung Galang Haedi Wijaya; Sutiarno Sutiarno; Pariaman Ginting; Agus Riyanto; Pulung Karokaro; Syafriadi Syafriadi
Jurnal Phi: Kurnal Pendidikan Fisika & Terapan Vol 3 No 2, 2022
Publisher : UIN Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Telah dilakukan penelitian biofaom menggunakan biopolimer alam berupa pati singkong, selulosa dari serat jagung, dan polivinil Alkohol (PVA). Pembuatan biofoam tersebut dicetak menggunakan metode thermopressing dengan T=150 OC dan ditekan t = 3 menit. Untuk meningkatkan kualitas produk, ditambahkanlah bahan aditif berupa ion Ag+ yang dapat memberikan sifat antibakteri biofoam. Ion Ag+ diproduksi dengan menggunakan metode elektrolisis dari batang AgBr  menggunakan tegangan listrik 15 Volt. Kemudian, larutan yang mengandung ion Ag+  hasil elektrolisis divarisasikan konsentrasi (12 ppm, 17 ppm, 22 ppm, 27 ppm). Ion tersebut kemudian dilapiskan ke dalam produk biofoam menggunakan metode dip coating, lalu dikeringkan pada suhu ruangan. Berdasarkan hasil karakterisasi FTIR,  gugus fungsi O-H dan N-H bending diduga tempat menempelnya ion Ag+ pada biofoam. Hal ini dikarenakan tingginya afinitas gugus tersebut serta perbedaan nilai keelektronegatifan pada atom O dan N. Berdasarkan hasil uji antibakteri bakteri Bacillus sp didapatkanlah nilai diameter zona hambat pengujian pada keempat sampel berturut-turut 1,88 mm, 2,88 mm, 5,55 mm, dan 7,44 mm. Namun, hasil berbeda didapatkan pada pengujian bakteri Escherchia coli dengan tidak munculnya zona hambat yang dihasilkan. Kemudian, penambahan ion Ag+ pada biofoam tidak mempengaruhi pengujian daya serap air karena nilai pengujian cendrung tetap dengan rata-rata pengujian daya serap air mecapai 18,37%.