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Jaka Fajar Fatriansyah
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Journal of Materials Exploration and Findings
Published by Universitas Indonesia
ISSN : -     EISSN : 29625475     DOI : https://doi.org/10.7454/jmef
Core Subject :
JMEF publishes publications that report on R&D discoveries and fundamental understanding of phenomena with potential significance, as well as those that explore solutions to current engineering challenges in materials and mechanical engineering or related fields. JMEF includes original research, review and short communication articles. JMEF welcomes original articles on all aspects of materials science/engineering and mechanical engineering, including: 1. Materials synthesis, processing and manufacturing; 2. Advanced Materials; 3. Extraction metallurgy; 4. Physics of Materials; 5. Computational studies on Materials and Mechanical Engineering; 6. Fluid Dynamics and Heat Transfer; 7. Management Integrity and Reliability Engineering; 8. Mechanical systems; and related fields.
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Articles 6 Documents
 1 
Search results for , issue "vol. 4, no. 3" : 6 Documents clear
Assessment of The Melt Quality of a 30% Scrap ADC12 Aluminium Alloy using The Inclusion and Fluidity Measurement Instrument (IFMI) With Mullite Ceramic Filters Ruri Lestari, Gusti Ruri; Riswan, Sandya Ananda; Anis, Muhammad; Ashari, Ahmad; Ayuningtyas, Paramita Vidya; Suharno, Bambang, Prof; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 4, No. 3
Publisher : UI Scholars Hub

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Abstract

The increasing demand for sustainable practices in the metal casting industry has driven the use of recycled aluminum alloys such as ADC12. However, the addition of aluminum scrap tends to increase oxide inclusions, which reduce melt fluidity and compromise casting quality. This study utilizes the Inclusion and Fluidity Measurement Instrument (IFMI), equipped with mullite ceramic filters, to assess the melt quality of ADC12 aluminum alloy containing 30% scrap. Fluidity and inclusion characteristics were evaluated at five pouring temperatures (660°C, 680°C, 700°C, 720°C, and 740°C). The results show that fluidity increased with temperature, reaching a peak of 84.6 g·s⁻¹ at 740°C, before declining due to excessive oxide inclusions. Quantitative analysis revealed that the average inclusion volume decreased from 0.257% in unfiltered samples to 0.114% in filtered ones, confirming the effectiveness of the filtration system. These findings demonstrate that IFMI can be used as a practical and real-time tool to evaluate melt quality in foundry applications, particularly when processing secondary aluminum alloys.
An Overview of Biomass-Derived Graphene Oxide and Its Characteristics for Future Sustainable Applications Wardana, Afif; Shahab, Ahmad Nabil; Dhaneswara, Donanta; Sofyan, Nofrijon
Journal of Materials Exploration and Findings Vol. 4, No. 3
Publisher : UI Scholars Hub

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Abstract

The production of graphene oxide (GO) from biomass presents considerable promise as a sustainable alternative substitute for traditional semiconductors. Biomass waste, abundant and often underutilized worldwide, is distinguished by its high carbon content and regenerative characteristics, rendering it an optimal resource for sustainable material production. By heating its biopolymers, lignocellulosic biomass can be used as a new material to make graphene, which forms three-dimensional turbostratic crystallites. These crystallites, composed of partially defective aromatic carbon sheets with graphite-like characteristics, make it easier to create GO with specialized functions for cutting-edge applications. Its capability underscores the revolutionary potential of biomass waste in producing high-value products from otherwise overlooked resources . A number of manufacturing methods are carefully studied and tested to improve the structure and oxygen functionality of GO. These include catalytic ferrocene, Hummer's, modified Hummer's, catalytic acid spray (CAS), Tour's, and electrochemical exfoliation. Additionally, doping with non-metallic elements, including nitrogen, boron, sulfur, and phosphorus (e.g., N, B, S, P), is investigated to adjust the band gap and improve charge carrier mobility, all of which are essential for optimizing electro-optical performance in semiconductors. This study highlights the unexploited potential of biomass as a resource and establishes a foundation for the advancement of GO-based semiconductors, driving the development of more environmentally friendly, efficient, and sustainable electronic technology.
Equipment Criticality Analysis to Determine Asset Integrity Management System Scheme in Supporting Production Optimization Scenarios in the Aeging Field Andryanto, Donny; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 4, No. 3
Publisher : UI Scholars Hub

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Abstract

This research investigates the production decline and cost increase in the X&Y oil and gas fields from 2022 to 2023. Production fell by 34%, while production costs per barrel rose by 79%. To address these issues, a series of optimization processes are proposed. These aim to restructure and enhance the production facilities to reduce current production costs. The optimizations include reducing pressure at the PPP Platform in 2024. Additional steps include shutting down CPP-ORF 14” pipelines and most processes at CPP 2 Platform by 2027 to convert it into an accommodation platform. Further, the plan involves optimizing the release of two FSO units and directing oil production to ORF via a 16” pipeline by 2028. This study also emphasizes the need for Asset Integrity Management to implement optimization scenarios. This measure aims to reduce maintenance costs, ensure plant integrity, and update maintenance programs based on equipment criticality assessments.
Analysis of Leakage in Nearshore Pipelines Using Fitness for Service Method to ensure Mechanical Integrity Based on API-579 Level 3 Elriandri, Elriandri; Priadi, Dedi
Journal of Materials Exploration and Findings Vol. 4, No. 3
Publisher : UI Scholars Hub

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Abstract

The Fitness for Service (FFS) analysis is performed as a quantitative assessment to evaluate the integrity condition of a pipeline. Essentially, FFS assessment helps determine whether equipment components can operate safely despite existing deficiencies. This evaluation is carried out using the Finite Element Method (FEM). In the case of an underwater pipeline that experiences leak due to anchor pull at the flange connection, it undergoes plastic deformation and is lifted approximately 1 meter. As a mitigation step, inspection and repairs have been carried out by the company. Subsequently, modeling is performed to reconstruct the deformation process of the pipeline. Then, analyses are performed for Vortex Induced Vibration (VIV) and fatigue. The results of these analyses indicate that the pipeline is still in an acceptable condition, making it suitable for normal operation. Additionally, flow simulations are considered in the study, with various sensitivities to estimate the remaining service life of the pipeline. Based on sensitivity to flow conditions, the minimum estimated service life of the pipeline is 3 years.
Identification Safety Critical Elements and Establish Performance Standards to Control Major Accident Hazard at The Geothermal Power Plant PT. XYZ Febriardy, Febriardy; Fatriansyah, Jaka Fajar; Endang, Endang; Bagaskoro, Farhan Iqbal; Kurniawan, Ari
Journal of Materials Exploration and Findings Vol. 4, No. 3
Publisher : UI Scholars Hub

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Abstract

Geothermal Power Plant (GPP) use steam from geothermal reservoirs to produce electricity. Power Plants are one of the most dangerous work environments. The dangers that exist in the power generation process can be in the form of Major Accident Hazard (MAH) and have a large impact which can cause Major Accidents. Major Accident prevention can be done by managing Safety Critical Elements (SCE) as a control measure in the form of procedures to prevent or mitigate the risks. Each SCE has a Performance Standard that includes targets and thresholds set to reduce risk to reach ALARP (As Low as Reasonably Practicable) that will be used as a reference in Inspection, Testing and Preventive Maintenance programs to prevent Major Accidents. This research was conducted to identify SCE and establish Performance Standard for GPP PT XYZ with a capacity of 1x55 MW. Based on the identification results, it is known that the total MAH at GPP PT XYZ is 112. Each MAH was analyzed using a bow-tie diagram to obtain a total of 532 SCE or 8.12% of the total 6,549 existing equipment.
Morphological Test of Areca Nut Fiber Ceramic Membrane Using Scanning Electron Microscopy Energy Dispersive X-ray Mapping Spectroscopy Marzain, Amelia; Kalsum, Siti Umi; Marhadi, Marhadi; Shahab, Ahmad Nabil
Journal of Materials Exploration and Findings Vol. 4, No. 3
Publisher : UI Scholars Hub

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Abstract

This study investigates the potential of ceramic membranes derived from areca nut fiber as a cost-effective and environmentally sustainable material for the removal of iron (Fe) and manganese (Mn) from groundwater. Two types of membranes were fabricated: one without activation and one chemically activated using 10% sodium hydroxide (NaOH). The morphological and elemental characteristics of both membranes were analyzed using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) mapping. The concentrations of Fe and Mn before and after treatment were measured using Atomic Absorption Spectroscopy (AAS). The NaOH-activated membrane exhibited a more porous surface structure and higher oxygen content, which enhanced its adsorption capability. This membrane achieved removal efficiencies of 55.94% for Fe and 67.72% for Mn- substantially higher than the non-activated variant. The results confirm the effectiveness of NaOH activation in enhancing membrane performance and demonstrate the potential of areca nut fiber as a valuable agricultural waste material for low-cost water purification in rural areas.

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