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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).
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.
Pemanfaatan Limbah Aki dan Komponen Elektronik sebagai Sumber Energi Listrik Ramah Lingkungan Junaidi Junaidi; Agus Riyanto; Gurum Ahmad Pauzi; Iqbal Firdaus
Jurnal Pengabdian Pada Masyarakat Vol 6 No 2 (2021)
Publisher : Universitas Mathla'ul Anwar Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30653/002.202162.717

Abstract

UTILIZATION OF ACCU WASTE AND ELECTRONIC COMPONENTS AS AN ENVIRONMENTALLY FRIENDLY ELECTRICAL ENERGY SOURCE. This community service is a form of community development activity in the utilization of Accu waste and electronic components as an alternative energy source for mini-inverters. The mini-inverter module is made using the Joule Thief method. This method is able to increase low electric power from a 1.5-volt battery source into AC alternating current that can turn on LED lights. The service activity will be carried out in Hajimena Village, Natar District, South Lampung Regency in August 2020. This community service activity was attended by 32 participants. Each service participant has been fostered and guided about the process of making mini-inverter modules from waste batteries and components that are no longer used so that they are ready to use and suitable for use and of economic value. The components used in the manufacture of mini-inverters are all obtained from components from AKI and used electronic components as alternative energy sources. With this activity, it is hoped that the partner community will understand how to utilize waste that is difficult to decompose into ready-to-sell goods.
Sifat Fisis Komposit Polietilen/Nanotitania Sebagai Fungsi Ketebalan Nola Fricilia; Posman Manurung; 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.v7i1.1930

Abstract

Physical properties of polyethylene (PE)/nanotitania composite as a function of thickness have been studied. The material used is PE and nanotitania. The blending of PE with nanotitania was carried out by melting polyethylene at 95 °C for 5 minutes then added nanotitania 5 wt% and 10 wt% and heated at 124 ° C for 30 minutes. Then printed using barcoater with size 6, 12 and 25 µm with four repetitions. Variations were performed to determine the effect of composite thickness of polyethylene/nanotitania on electrical properties and functional groups. FTIR results show that as the thickness of the absorption sample increases, new functional groups appear, namely hydroxyl and carbonyl. The LCR results show the smallest conductivity value, sample 5 wt% PE / nanotitania with 6 µm size and the largest 10% PE/nanotitania sample with a size of 25 µm each at 2,302 x 10-5 S/m and 3,121 x 10-5 S/m at a frequency of 105 Hz. While the largest dielectric constant value is a sample of PE/nanotitania 5 wt% with a size of 6 µm and the smallest sample PE/nanotitania 10 wt% with a size of 6 µm at a frequency of 105 Hz. Based on these characteristics, the 5 wt% PE/nanotitania sample with a size of 6 µm is the material with the best dielectric properties so that the sample has the potential to be used as a cable insulator.
Efektivitas Ekstrak Daun Pepaya (Carica papaya L.) Sebagai Inhibitor pada Baja ST37 dalam Medium Korosif NaCl 3% dengan Variasi Waktu Perendaman ramon sanjaya; Ediman Ginting; 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.v6i2.1839

Abstract

This research aims to determine the effectiveness of papaya leaf extract (carica papaya l) as  inhibitor on st37 steel in corrosive medium nacl 3 %. To find out the corrosion rate resulted by weight reduction method. To know the phase formed on steel is done XRD analysis. While, to know the micro structure and corrosion products produced on steel after soaked in corrosive medium with inhibitor and without inhibitor papaya leaf extract, SEM and EDS analysis were performed. Based on the results of XRD analysis, SEM and EDS with the addition of inhibitors of the diffraction peaks decreased, and the corroded surface area decreased, and the reduction of FeO content in the sample wass less. From the three analyzes and calculation of corrosion rate obtained that inhibitor papaya leaf extract, effectively inhibiting the corrosion rate on St37 Steel
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.
SUPERKAPASITOR SEBAGAI PIRANTI PENYIMPAN ENERGI LISTRIK MASA DEPAN Agus Riyanto
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 3, No 2 (2014): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jpifalbiruni.v3i2.73

Abstract

Superkapasitor merupakan teknologi baru yang dikembangkan dari kapasitor konvensional yang dikembangkan untuk penyimpan energi yang modern. Kapasitor ini memanfaatkan permukaan elektroda yang luas dan bahan dielektrik yang tipis untuk mencapai nilai kapasitansi yang jauh lebih besar daripada kapasitor konvensional. Hal ini memungkinkan superkapasitor akan memiliki rapat energi yang jauh lebih besar dibanding dengan kapasitor konvensional dan memiliki rapat daya jauh lebih besar daripada baterai. Sehingga, superkapasitor akan menjadi solusi yang sangat baik sebagai piranti penyimpan energi.
Silver Nanorods Layer Based on Polyvinyl Alcohol on Glass Substrates by Dip-Coating Method Junaidi Junaidi; Agus Riyanto; Kuwat Triyana; Khairurrijal Khairurrijal
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 9 No. 1 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n1.p1-9

Abstract

This research reports the investigation of the performance of a thin layer based on silver nanorods using the dip-coating method. The synthesis was conducted by polyol method at an oil bath temperature of 140 °C. In the synthesis of silver nanorods, materials used were silver nitrate (AgNO3) as the main raw material, ethylene glycol (EG) as the solvent, and a small amount of sodium chloride (NaCl) as a mediated-agent (precursor). Polyvinyl alcohol (PVA) used as a capping agent and stabilizer in this process. Diameter and length of silver nanorods were 800 nm and 15 µm, respectively. Furthermore, the silver nanorods suspension was deposition onto a glass substrate with a variety of dipping cycles. The result showed the thickness of the thin layer is linear with a number of dipping cycles. Electrical and optical properties of thin layer show that sheet resistance about of 30 Ω sq-1 by transmittance above of 80%. The silver nanorods thin film can be used as a conductive and transparent electrode for various optoelectronic applications.
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.
PEMBERDAYAAN MASYARAKAT DALAM PEMANFAATAN LIMBAH LAMPU HEMAT ENERGI (LHE) SEBAGAI ALTERNATIF LAMPU EMERGENCY DENGAN TEKNIK JOULE THIEF Junaidi Junaidi; Agus Riyanto; Gurum Ahmad Pauzi; Arif Surtono
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol 4 No 2 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v4i2.157

Abstract

Pengabdian ini merupakan bentuk kegiatan pemberdayaan masyarakat dalam pemafaatan limbah lampu hemat energi (LHE) untuk pembuatan lampu emergency. Pembuatan lampu emergency dilakukan dengan metode JouleThief. Metode ini mampu meningkatkan daya listrik rendah dari sumber baterai 1,5 volt menjadi arus bolak-balik AC yang dapat menyalakan lampu LED. Peserta dalam kegiatan pengabdian kepada masyarakat ini adalah sekitar 32 orang. Setiap peserta pengabdian dibina tentang proses pemanfaatan limbah lampu LHE yang sudah tidak terpakai agar menjadi barang siap guna dan memiliki nilai jual ekonomis. Komponen yang digunakan dalam pembuatan lampu emergency semuanya diperoleh dari komponen dari bekas lampu LHE. Dengan kegiatan ini diharapkan masyarakat mitra menjadi paham tentang bagaimana memanfaatkan limbah yang sulit terurai menjadi barang siap jual. Hasil pengabdian menunjukkan bahwa pencapaian TIK sebelum kegiatan pengabdian pembuatan lampu emergency dengan teknik Joule Thief adalah 35,63%. Pencapaian TIK setelah kegiatan pengabdian pembuatan emergency adalah 80,94%. Dari hasil tersebut, terjadi peningkatan untuk masing-masing pencapaian TIK dengan rata-rata sebesar 45,31%.