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All Journal TEKNIK Teknika Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Sains Materi Indonesia Prosiding Semnastek JFA (Jurnal Fisika dan Aplikasinya) Science and Technology Indonesia Biodidaktika : Jurnal Biologi dan Pembelajarannya Jurnal SOLMA Jurnal Teori dan Aplikasi Fisika Jurnal Fisika Indonesia Jurnal Riset Teknologi Pencegahan Pencemaran Industri Journal of Energy, Material, and Instrumentation Technology NEAR: Jurnal Pengabdian kepada Masyarakat AMMA : Jurnal Pengabdian Masyarakat

Marjunus, Roniyus

Department Of Physics, Faculty Of Mathematics And Natural Sciences, University Of Lampung, Bandar Lampung

Author-ID : 3389699

Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Nursing Physics Public Health Social Sciences Transportation Other

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Processing of granite quarry solid waste into industrial high silica materials using leaching process with HCl concentration variation Hendronursito, Yusup; Amin, Muhammad; Sumardi, Slamet; Marjunus, Roniyus; Clarasati, Frista; Birawidha, David Candra; Muttaqqi, Muhammad Al; Isnugroho, Kusno
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 11 No. 2 (2020)
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2020.v11.no2.p43-50

This study was aimed to increase granite's silica content using the leaching process with HCl concentration variation. The granite used in this study came from Lematang, South Lampung. This study aims to determine the effect of variations in HCl concentration, particle size, and rotational speed on the crystalline phase and chemical elements formed in the silica product produced from granite. The HCl concentration variations were 6.0 M, 7.2 M, 8.4 M, and 9.6 M, the variation in particle size used was 270 and 400 mesh. Variations in rotational speed during leaching were 500 and 750 rpm. Granite powder was calcined at 1000 ºC for 2 hours. Characterization was performed using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP- OES). The results showed that the silica content increased with increasing HCl concentration, the finer the particle size, and the higher the rotational speed. XRF analysis showed that the silica with the highest purity was leached with 9.6 HCl with a particle size of 400 mesh and a rotational speed of of 750 rpm, which was 73.49%. Based on the results above, by leaching using HCl, the Si content can increase from before. The XRD diffractogram showed that the granite powder formed the Quartz phase.

Analysis of Fine Glass Waste Addition as a Filler Material for Sand Substitution on the Properties of Mortar Products Suharto, Suharto; Amin, Muhammad; Al Muttaqii, Muhammad; Marjunus, Roniyus; Fitri, Nuzullia; Suhartono, Suhartono
TEKNIK Vol 42, No. 3 (2021): December 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i3.32686

Inorganic glass waste can replace sand in mortar production due to its SiO2 content being greater than 70%. This study aims to analyze the increase in mortal product agility due to the substitution of sand and reducing environmental pollution. The fine glass waste used is restrained on 80 and 120 mesh sieves. The fine glass waste substitution variations are 0, 10, 20, 30, 40, and 50% of the sand weight. The results show that fine glass waste could be used as a material for sand substitution because of the content of SiO2 of 73.8%. The results from XRD indicate that the phase of fine waste glass is amorphous. The mortar was printed with a 5x5x5 cm cube mold, and it was soaked for 7, 14, and 21 days. Based on the results, the compressive strength with a high value of 13.58 MPa at 20% fine glass waste substitution and 120 mesh. The density of 2.8Â±0.8 g/cm3, porosity 4.40Â±0.001%, and absorption 2.83Â±0,0009%. The compressive strengths, density, porosity, absorption, XRF and XRD characterization were evaluated. The results showed that the SiO2 compound in waste glass with the right composition of 20% could significantly increase the compressive strength. Phase formation of Calcite (CaCO3), Quartz (SiO2), and Portlandite (Ca(OH)2) was formed from the results of XRF characterization

PEMANTULAN DAN PEMBIASAN GELOMBANG ELEKTROMAGNET HARMONIK PERTAMA (FHEM) TERPOLARISASI-S DI BIDANG BATAS BAWAH BAHAN ANTIFEROMAGNETIK FeF2 PADA KONFIGURASI VOIGT Tauﬁk Nurrohman; Roniyus M. S.
Jurnal Sains Materi Indonesia Vol 5, No 1: OKTOBER 2003
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PEMANTULAN DAN PEMBIASAN GELOMBANG ELEKTROMAGNET HARMONIK PERTAMA (FHEM) TERPOLARISASI-S DI BIDANG BATAS BAWAH BAHAN ANTIFEROMAGNETIK FeF2 PADA KONFIGURASI VOIGT. Telah dilakukan analisis teoretis mengenai pemantulan dan pembiasan gelombang elektromagnet harmonik pertama (FHEM) terpolarisasi-s di bidang batas bawah bahan antiferomagnetik FeF2 pada konﬁgurasi Voigt. Dari penelitian ini didapatkan informasi bahwa reﬂektansi (R) dan transmitansi (T) gelombang elektromagnet harmonik pertama di bidang batas bawah memiliki sifat tak resiprokal terhadap perubahan tanda HO (medan magnet konstan terpasang dari luar) maupun terhadap perubahan tanda sudut Φ(sudut tiba gelombang datang), sama seperti sifat-sifat yang diperoleh di bidang batas atas. Selain itu diperoleh juga relasi V1(Ho) = V2(-Ho) dan V1(Φ) = V2(-Φ) dengan V1 dan V2 berturut-turut adalah R dan T di bidang batas atas dan bidang bawah.

PERHITUNGAN REFLEKTANSI DAN TRANSMITANSI GELOMBANG ELEKTROMAGNET HARMONIK KEDUA TERPOLARISASI-S PADA BAHAN ANTIFEROMAGNET FeF2 DALAM KONFIGURASI FARADAY Roniyus M. S.; Muslim Muslim; Kamsul Abraha
Jurnal Sains Materi Indonesia Vol 5, No 1: OKTOBER 2003
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PERHITUNGAN REFLEKTANSI DAN TRANSMITANSI GELOMBANG ELEKTROMAGNET HARMONIK KEDUA TERPOLARISASI-S PADA BAHAN ANTIFEROMAGNET FeF2 DALAM KONFIGURASI FARADAY. Telah dilakukan perhitungan reﬂektansi dan transmitansi gelombang elektromagnet harmonik kedua terpolarisasi-s pada bahan antiferomagnet FeF2 dalam konﬁgurasi Faraday. Gelombang elektromagnet harmonik kedua (SHEM) yang terpantul dan terbias ini sangat dipengaruhi oleh gelombang elektromagnet harmonik pertama yang terpantul dan terbias yang dibangkitkan oleh gelombang datang. Prosentase dari pemantulan dan pembiasan gelombang SHEM ini lebih kecil daripada gelombang harmonik pertama. Dari perhitungan ini didapatkan informasi bahwa perbandingan antara R(2)/T1(2) dan T2(2)/T1(2) dengan R(2),T1(2) dan T2(2) berturut-turut adalah reﬂektansi gelombang SHEM, transmitansi gelombang SHEM yang terbias pertama dan transmitansi gelombang SHEM yang terbias kedua, memiliki sifat resiprokal terhadap perubahan tanda φ(sudut tiba gelombang datang terhadap garis normal) dan Hφ (medan magnet konstan terpasang dari luar).

Synthesis and characterization of TiO2 from Lampung’s Iron Sand using Leaching Method with Temperature Variation Iqbal Firdaus; Anggi Stevani; Yudhistira Novita Handayani; Nadia Febriyanti; Roniyus Marjunus; Posman Manurung
Jurnal Fisika dan Aplikasinya Vol 17, No 2 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i2.7921

Ilmenite is a natural material in the form of sand which contains heavy metal minerals that are very abundant in Lampung province. This research aims to determine the content of TiO2 from Lampungs iron sand by leaching method with temperature variation. The iron sand are mixed with sodium hydrogen carbonate (NaHCO3), then heated at 700◦C for an hour. This research uses 5 samples with leaching temperature variation of 70, 80, 90, 100, and 110◦C for 2 hours. The acid leaching process uses HCl 12 M with a ratio of iron sand and HCl of 1:4, while the water leaching process uses 50 ml of distilled water. Furthermore, the samples are characterized using XRD and XRF to determine TiO2 content in the iron sand. The result shows that the highest amount of TiO2 is obtained in the sample with the leaching temperature of 110◦C for 2 hours, which is approximately 61%.

Pengaruh Variasi Kadar CaCO3 terhadap Pertumbuhan Fase Superkonduktor BPSCCO–2212 Menggunakan Metode Pencampuran Basah Rianggi Wahyuni Pratiwi; Suprihatin; Simon Sembiring; Roniyus Marjunus
Journal of Energy, Material, and Instrumentation Technology Vol 2 No 1 (2021): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

This research was conducted to determine the effect of CaCO3 levels on the formation of superconducting phase BPSCCO - 2212 by calculating the level of purity of the phases formed and looking at the microstructure. The variation of CaCO3 was 0.95, 1.00, 1.05 and 1.10 mole using the wet mixing method. The samples were calcined at 800 ° C for 10 hours, and sintered at 820 ° C for 20 hours. Synthesized samples were characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The XRD’s chacterization results show that the level of purity of the formed phases increases with increasing Ca levels with maximum point at BPSCCO-2212/1.10 mole. The highest volume fraction was 79,06% in the BPSCCO-2212/1.10 sample. While the lowest volume fraction was 72.10% in the BPSCCO-2212/0.95 sample. Meanwhile, the highest degree of orientation was 20.59% at BPSCCO-2212/0.95. The lowest degree of orientation was 8.46% at BPSCCO-2212/1.10. SEM’s chacterization results show of all samples have been oriented altought not perfect yet and have relatively little space between slabs (voids).

Penggunaan Metode Taguchi untuk Menentukan Kondisi Parameter Optimum Pada Pembuatan CaO dari Batu Kapur (CaCO-3) Lilik Widia; Roniyus Marjunus; Sudibyo
Journal of Energy, Material, and Instrumentation Technology Vol 2 No 1 (2021): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Research has been carried out to determine the optimum conditions for making quicklime (CaO) using the Taguchi Method. CaO is the burning result of limestone (CaC ) in calcination process by releasing of C gas until CaO solids occur. The limestone was calcined at . The Taguchi Method is a quality improvement technique with the selection of the most influential parameters of the making of process CaO. The parameters are particle size, CaO mass, heating temperature and stirring time. The XRF results show that the levels of CaO after the Taguchi Method design has increased from 98.779% to 98.814%. The XRD results show that the CaO phase is amorphous. The phase which were formed by calcination are Lime (CaO), Quartz (Si ) and Hematite ( ). Based on the SEM results, the morphology of CaC has an irregular particle size and tends to be a granular solid due to the presence of impurity. Meanwhile, the results of the EDS analysis show that the content of Calcium (Ca) is quite high. From the design results of the Taguchi Method, the optimum conditions is obtained at a particle size of 140 mesh, 75 gr CaO mass, heating temperature and stirring time 0,5 hour.

Pengendalian Laju Korosi Baja AISI 1018 Dalam Medium Korosif NaCl 3% Menggunakan Inhibitor Ekstrak Daun Ketapang (Terminalia catappa L.) Ulfa Nurini; Ediman Ginting Suka; Roniyus Marjunus
Journal of Energy, Material, and Instrumentation Technology Vol 3 No 1 (2022): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v3i1.89

This research aims to determine the effectiveness of ketapang leaf extract (Terminalia catappa L.) as inhibitor on AISI steel in corrosive medium NaCl 3%. Specifically, the purpose of this research is to know the effect of the addition of 0%, 2%, 4%, 6%, 8%, dan 10% inhibitor concentration of ketapang leaf extract and 6 days to the corrosion rate. To find out the corrosion rate resulted by weight reduction method with an inhibitor efficiency value of 69,9%. The x-ray diffraction (XRD) results show that the phase formed is pure Fe phase. The results of scanning electron microscopy (SEM) show the presence of lumps on steel surfaces of various sizes which are the product of corrosion. This is reinforced by the results of energy dispersive spectroscopy (EDS) which shows that the increasing number of lumps on the steel surface leaves fewer Fe elements.

Pemantulan dan Pembiasan Gelombang Elektromagnetik Terpolarisasi-p Pada Bidang Batas Kanan Bahan Antiferomagnetik FeF2 di Dalam Konfigurasi Faraday Diah Purwarini; Roniyus Marjunus; Syafiadi Syafriyadi
Jurnal Fisika Indonesia Vol 24, No 1 (2020)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v24i1.52013

Telah dilakukan penelitian teoretis mengenai pemantulan dan pembiasan gelombang elektromagnetik terpolarisasi-p pada bidang batas kanan bahan antiferomagnetik FeF2 pada Konfigurasi Faraday (konﬁgurasi dengan medan magnet luar yang konstan dan homogen dipasang sejajar terhadap bidang datang). Penelitian ini dilakukan untuk membandingkan reflektansi dan transmitansi antara sisi kiri yang telah diperoleh dari penelitian sebelumnya dengan yang dilakukan dalam penelitian ini. Dari penelitian teoretis ini diperoleh hasil bahwa reflektansi dan transmitansi di sisi kanan bahan bersifat resiprok yang berarti tidak terjadi perubahan nilai ketika terjadi perubahan tanda (arah) medan magnet dari luar maupun sudut datang . Pada penelitian teoretis ini, reflektansi dan transmitansi gelombang elektromagnetik pada bidang batas kanan dan kiri bahan memiliki nilai dan sifat yang sama, kecuali pada reflektansi saat frekuensi resonansi (52,45 cm-1) yaitu sebesar (pada sisi kanan) dan (pada sisi kiri).

Pengaruh Variasi Waktu Tahan pada Austenisasi dengan Pendinginan Cepat terhadap Kekerasan dan Ketangguhan Baja AISI 1045 Ediman Ginting; Endarmoko -; Roniyus Marjunus
Jurnal Fisika Indonesia Vol 24, No 1 (2020)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v24i1.54038

Telah direalisasikan Pengaruh Variasi Waktu Tahan Austenisasi dengan Pendinginan Cepat terhadap Kekerasan dan Ketangguhan Baja AISI 1045. Penelitian ini dilakukan untuk mengetahui bagaimana pengaruh waktu tahan austenisasi dengan variasi waktu tahan 0 menit, 15 menit, 25 menit, dan 40 menit dilanjutkan pendinginan cepat terhadap kekerasan dan ketangguhan Baja AISI 1045. Baja AISI 1045 diberi perlakuan panas menggunakan furnace dengan suhu austenisasi 830 oC, kemudian didinginkan cepat dengan air ± 3 detik. Baja AISI 1045 diuji menggunakan Universal Hardness Tester Rockwell C untuk uji kekerasan dan Mesin Uji Impak untuk uji ketangguhan. Hasil penelitian diperoleh bahwa nilai kekerasan Baja AISI 1045 meningkat dan nilai ketangguhan menurun. Nilai rata-rata kekerasan terbesar diperoleh pada waktu tahan 40 menit sebesar 75,30±0,9 HRC. Nilai rata-rata ketangguhan terkecil diperoleh pada waktu tahan 40 menit sebesar 0,85±0,04 J/mm2.

Co-Authors Aang Nuryaman Adi Saputra Agus Riyanto Agus Riyanto Agus Supriadi Agustrina, Rochmah Ahmad Munawir Siregar Ahmad Rosadi Al Muttaqii, Muhammad Amanto Amanto Amanto Amanto Amir Supriyanto Anggi Stevani Birawidha, David Candra Chambioso, Yugo Clarasati, Frista Dewi, Jilda Sofiana Diah Purwarini Dita Rahmayanti Dwi Asmi Dwi Asmi Ediman Ginting Ediman Ginting Suka Eka Febriansyah, Febi Endarmoko - Fitri, Nuzullia Fuadiyah, Nadhifatul Harry Supriadi Heningtyas, Yunda Heri Satria Heri Satria Humairoh Ratu Ayu Imam Prayogi Indah Pratiwi Iqbal Firdaus Irvana, Raihan Isnugroho, Kusno Junaidi - Junaidi Junaidi Junaidi Junaidi Junaidi Junaidi Kamisah Delilawati Pandiangan Kamisah Delilawati Pandiangan Kamsul Abraha Karo , Pulung Karo Lidya Susanti, Nida Lilik Widia Mahfut Malik, Daffa Abdul Muhammad Amin Muhammad Rizki Muslim Muslim Muttaqqi, Muhammad Al Nadia Febriyanti Nainggolan, Nurul Istiqomah Nanda Efbriyansyah Nugroho Susanto, Gregorius Posman Manurung Pulung Karo-Karo Putri, Aprilia Eka Rahayu, Sri Rianggi Wahyuni Pratiwi Rio Orlando Pratama Setyawan, Dodi Yudo Simon Sembiring Simon Sembiring Slamet Sumardi, Slamet Solly Aryza Sri Rahayu Sri Ratna Sulistiyanti Sri Wahyu Suciyati Sudibyo SUHARTO Suharto Suharto Suka, Ediman Ginting Sumaryo Sumaryo Sumaryo Suprihatin Supriyatna, Yayat Iman Surtono, Arif Sutopo Hadi Syafiadi Syafriyadi Syafriadi Syafriadi Syaifudin Tauﬁk Nurrohman Tiara Widiastuti Trismahargyono Trismahargyono Ulfa Nurini Warsito Warsito Warsito Warsito Wawan Rustyawan Widi Astuti Yanti Yulianti Yanti Yulianti Yanti Yulianti Yudhistira Novita Handayani Yusup Hendronursito, Yusup

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