Article Per Year (5 Year)
p-Index From 2021 - 2026
3.713
P-Index
This Author published in this journals
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
Marjunus, Roniyus
Department Of Physics, Faculty Of Mathematics And Natural Sciences, University Of Lampung, Bandar Lampung
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 Library & Information Science Materials Science & Nanotechnology Nursing Physics Public Health Social Sciences Transportation Other

Published : 33 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 33 Documents
Search

 1   2   3   4 
Analysis of the Effect of Saltwater (NaCl) Solution Concentration During the Quenching Process on the Microstructure and Hardness of Medium Carbon Steel Supriadi, Agus; Suka, Ediman Ginting; Marjunus, Roniyus
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 1 (2025): 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.v6i1.52

Abstract

Centrifugal pumps type Overhung 4 size 4x11 often experience sand deposits and erosion problems, especially in the oil and gas industry, resulting in reduced productivity and increased repair costs. This study evaluates the application of the Piping Plan 13 API 682 as a solution to this problem. The 5-Why Analysis method is used to identify the root cause of sand deposits, which were associated with sand contamination from a liquid source and the absence of an effective filtering system. The implementation of Piping Plan 13 aims to prevent sand deposits in critical areas, such as the Pedestal Cover and Pedestals, by leveraging the circulation design of the pipeline. The results showed a 19.75% increase in pump productivity and a 76.12% reduction in repair costs. Productivity increases reached 336,000 barrels (about 53,419,731 liters) over 16 days of operation, while the repair cost fell from Rp6,699,950 to Rp1,600,000. These findings indicate that Piping Plan 13 API 682 is an effective solution to increase the life and performance of the centrifugal pump and reduce maintenance costs in operating conditions with high sand contamination.
The Effect of Bentonite and Palm Shell Ash on The Mechanical and Physical Properties of Geopolymer Concrete Hendronursito, Yusup; Amin, Muhammad; Chambioso, Yugo; Suharto; Marjunus, Roniyus
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 13 No. 2 (2022): November
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2022.v13.no2.p21-27

Abstract

Geopolymer concrete is an alternative to obtaining environmentally friendly mortar by synthesizing materials that contain a lot of aluminum silicate. This study aims to determine the effect of bentonite and palm shell ash composition on geopolymers' physical and mechanical characteristics. All materials are mashed, mixed, and molded with a 5x5x5 cm3 cube. Ten specimens were prepared with bentonite - palm shell ash compositions are 40/45, 45/40, 50/35, 55/30, and 60/25 wt%. Meanwhile, the composition of NaOH, Na2SiO3, superplasticizer and water remained at 1.3, 7.7, 2, and 5 wt%, respectively. Then the samples were dried at room temperature for 24 hrs and heated at 60 °C or 80 °C for 12 hrs. The geopolymer concrete with the best characteristics was obtained with a composition of 40 wt% bentonites and 45 wt% palm shell ash by heating at 80 °C. This specimen has a compressive strength of 11.94 MPa with a density of 2.42 g/cm3, porosity of 8.43%, and absorption of 3.48%. The results have a chemical composition of 55.59% SiO₂, 9.45% Al2O3, and 8.22 Fe2O3 with a dominant quartz phase. Scanning electron microscope photo shows good bonding between particles, and there are no pores formed.
Peningkatan Kualitas Pemahaman Konten dan Teknik Pengajaran Mata Pelajaran Fisika, Kimia, Matematika, Biologi, dan Teknologi Informasi Komputer (TIK) Roniyus Marjunus; Kamisah Delilawati Pandiangan; Amanto Amanto; Mahfut Mahfut; Yunda Heningtyas; Heri Satria
Jurnal SOLMA Vol. 12 No. 1 (2023)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v12i1.10201

Abstract

Background: Pembelajaran Fisika, Kimia, Matematika, Biologi dan Teknologi Informasi-Komputer (TIK) atau disingkat MIPA-TIK di level Sekolah Menengah Atas (SMA) merupakan salah satu bagian dari komponen pendidikan tersebut. Pemahaman yang baik dan benar dari siswa SMA tentang MIPA-TIK diperlukan agar siswa SMA tidak lagi memandang mata pelajaran tersebut sebagai ilmu pengetahuan yang sukar. Oleh karena itu tingkat kualitas pemahaman guru-guru mata pelajaran tersebut di Provinsi Lampung umumnya dan Kabupaten Lampung Selatan khususnya, memegang peranan yang sangat penting. Metode: Evaluasi dilakukan pada awal kegiatan (pre-test) dan akhir kegiatan (post-test) untuk melihat keberhasilan dari kegiatan ini. Hasil: Hasil post-test dibanding pre-test sebesar 45,8%. Kesimpulan: terjadi peningkatan kemampuan atau kompetensi guru-guru dalam menyampaikan materi mata pelajaran tersebut secara baik dan benar.
Co-Authors 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 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 Lilik Widia Mahfut Malik, Daffa Abdul Muhammad Amin Muhammad Rizki Muslim Muslim Muttaqqi, Muhammad Al Nadia Febriyanti Nainggolan, Nurul Istiqomah Nanda Efbriyansyah 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 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