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All Journal Rekayasa Mesin Jurnal Penelitian Pendidikan IPA (JPPIPA) Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Ikhsan, Alfikri
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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IMPLEMENTASI STOKASTIK PADA INVESTIGASI PENGARUH I/D TERHADAP PERILAKU ANTARMUKA ALIRAN BERLAWANAN ARAH DI GEOMETRI 1/30 HOT LEG PWR MENGGUNAKAN SENSOR KONDUKTANSI Astyanto, Achilleus Hermawan; Rasyidi, Muchsin Muzafar; Nugroho, Akhlisa Nadiantya Aji; Ikhsan, Alfikri; Saleh, Dede Rafico
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1531

Abstract

A small leakage in the primary circuit of a nuclear power plant reactor may trigger the occurrence of countercurrent flow which probably develops into a flooding regime followed by the zero penetration caused core cooling failure. During extensive studies in the flooding phenomena in the PWR hot leg, the geometry effects have been widely investigated. The present study investigates the effects of I/D ratios of the riser on the interfacial fluctuations during the counter-current flow on a 1/30 scaled down PWR hot leg geometry. Here, the liquid film fluctuations were acquired by using parallel wire array probes on the basis of a conductance concept. Three I/D ratios which were varied consisted 1.9 (R1), 3.9 (R2) and 8.3 (R3). The obtained data were analyzed on the basis of both time and frequency domains. From the PDF the flooding regime obtains multimodal distributions, while the PSD approaches lower frequencies with higher magnitudes corresponding to either the occurrence of water blockage or slugs. Keywords: I/D ratio, water level fluctuation, counter-current flow, PWR hot leg, parallel wire array probe, stochastic analysis.
Evaluation of Solar Energy Potential in Bojakan Village, Mentawai Islands Using PVGIS Simulation Ikhsan, Alfikri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.544

Abstract

Electricity access remains highly uneven in Indonesia, especially in remote and underserved island regions such as the Mentawai Islands in West Sumatra. Bojakan Village, located in North Siberut District, is one of several communities still lacking electricity from the national utility grid (PLN). In response to this challenge, this study explores the technical feasibility of deploying solar photovoltaic (PV) systems as a renewable energy solution. Using hourly simulation data for a standard 1 kWp PV system from the Photovoltaic Geographical Information System (PVGIS), developed by the Joint Research Centre (JRC), energy production was analyzed over a three-year period (2021–2023). The data were processed in MATLAB to assess daily output, seasonal fluctuations, and average performance. Findings show that the PV system produces an average of 3.64 kWh/day. To meet the village’s projected electricity demand by 2031, a system with a capacity of approximately 49.7 kWp would be required, occupying a ground area of around 1,093.4 m². The results indicate that Bojakan holds sufficient solar potential for a sustainable off-grid energy system, subject to further technical and socio-economic considerations.
IMPLEMENTASI STOKASTIK PADA INVESTIGASI PENGARUH I/D TERHADAP PERILAKU ANTARMUKA ALIRAN BERLAWANAN ARAH DI GEOMETRI 1/30 HOT LEG PWR MENGGUNAKAN SENSOR KONDUKTANSI Astyanto, Achilleus Hermawan; Rasyidi, Muchsin Muzafar; Nugroho, Akhlisa Nadiantya Aji; Ikhsan, Alfikri; Saleh, Dede Rafico
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1531

Abstract

A small leakage in the primary circuit of a nuclear power plant reactor may trigger the occurrence of countercurrent flow which probably develops into a flooding regime followed by the zero penetration caused core cooling failure. During extensive studies in the flooding phenomena in the PWR hot leg, the geometry effects have been widely investigated. The present study investigates the effects of I/D ratios of the riser on the interfacial fluctuations during the counter-current flow on a 1/30 scaled down PWR hot leg geometry. Here, the liquid film fluctuations were acquired by using parallel wire array probes on the basis of a conductance concept. Three I/D ratios which were varied consisted 1.9 (R1), 3.9 (R2) and 8.3 (R3). The obtained data were analyzed on the basis of both time and frequency domains. From the PDF the flooding regime obtains multimodal distributions, while the PSD approaches lower frequencies with higher magnitudes corresponding to either the occurrence of water blockage or slugs. Keywords: I/D ratio, water level fluctuation, counter-current flow, PWR hot leg, parallel wire array probe, stochastic analysis.
Design and Performance Testing of Vacuum Induction Furnaces for the Development of Magnesium-Based Biodegradable Implant Materials Susanti, Oknovia; Alhadid, Muhammad Alif; Rispandi, Rispandi; Ikhsan, Alfikri
Jurnal Penelitian Pendidikan IPA Vol 12 No 1 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i1.13203

Abstract

Magnesium (Mg) has emerged as a promising biomaterial for implants due to its similarity in physical and mechanical properties to human bone, as well as its ability to degrade safely in the body. However, the main challenges with magnesium are its relatively low mechanical strength and its high tendency to oxidize during the casting process. The use of the Vacuum Induction Casting (VIC) method is crucial to overcome oxidation and porosity issues, resulting in cast products with better integrity. This study aims to design and test the performance of a laboratory-scale vacuum induction furnace for the development of magnesium-based biodegradable implant materials. The furnace was designed using Autodesk Inventor, using a 3.000 W induction module, a water-cooled copper coil, an HA-1 refractory chamber, and a graphite crucible (±52 mL/90 g Mg). Tests showed that the furnace was able to reach an operating temperature of approximately 1.020°C in 2 minutes and 15 seconds, and successfully melted 60 grams of Mg–Gd alloy while the lowest vacuum pressure achieved by the equipment was 0.473 Atm. Rockwell A scale hardness tests yielded average values ​​of 67.1 HRA for Mg–3%Gd and 74.9 HRA for Mg–4%Gd, indicating an increase in hardness with increasing gadolinium content
Co-Authors Achilleus Hermawan Astyanto Alhadid, Muhammad Alif Nugroho, Akhlisa Nadiantya Aji Rasyidi, Muchsin Muzafar Rispandi Saleh, Dede Rafico Susanti, Oknovia