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Artikel Jurnal
Effect of Shielded Metal Arc Welding (SMAW) Current Variations and The Hardening Process on the Tensile Strength of Low-Carbon Steel
This study aims to analyze the effect of Shielded Metal Arc Welding (SMAW) current variations and the hardening process, using SAE 90 oil as the quenching medium, on the tensile strength of ST41 steel. Welding was performed using E6013 electrodes with current variations of 60 A, 70 A, 80 A, 90 A…
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Artikel Jurnal
Biosurfactant-Assisted Hydrogen Evolution: Effects of Sapindus Rarak Extract on Alkaline Electrolysis Performance
Hydrogen production through alkaline water electrolysis is a promising pathway for clean energy generation, yet its efficiency is often limited by gas bubble accumulation on electrode surfaces. This study explores the use of a natural surfactant derived from Sapindus rarak (lerak) as a green…
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Artikel Jurnal
Effect of High Concentration Alkali Treatment on the Mechanical and Structural Properties of Doyo Fibers (Curculigo Latifolia)
The growing demand for sustainable materials has increased interest in natural fibers as eco-friendly reinforcements. Doyo fiber (Curculigo latifolia) from East Kalimantan remains insufficiently characterized despite its ecological potential. This study investigates the effect of alkali treatment…
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Artikel Jurnal
Design and Development of a 70 Kg Capacity HDPE Hot Press Machine to Support SDGs Programs in the Polin ATMI and Industrial
Plastic is one of the most widely used materials in Indonesia. One type is HDPE (High-Density Polyethylene) plastic, this type is most widely used in daily life and one of the largest contributors of plastic waste. Despite its recyclability HDPE have recyclable properties, therefore the recycling…
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Artikel Jurnal
Optimization of 3D Printing Process Parameters of Fused Deposition Modeling on Impact Strength of Onyx–Glass Fiber Composite
The fused deposition modeling (FDM) process is an additive manufacturing technique that fabricates 3D objects through layer-by-layer deposition of molten material. This study aims to determine the optimum process parameters for fabricating onyx-glass fiber composites with maximum impact strength…
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Artikel Jurnal
Comparative Analysis of Structure and Material of Absorption Box on Rear Underrun Protection Device using Simple Additive Weighting
Rear-end collisions between passenger vehicles and heavy trucks frequently result in high fatality rates due to underride events, in which the smaller vehicle slides beneath the truck. This underscores the need for improved passive safety systems, particularly the Rear Underrun Protection Device…
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Artikel Jurnal
Influence of Anodizing Parameters on Surface Hardness of Recast Al6061 for Hexapod Fixator Ring Development
Blount’s disease can potentially reduce the productivity of the next generation. An external fixation device, such as a hexapod, is required to manage this disease. However, a hexapod is still difficult to access at an affordable price. Gravity casting is an alternative manufacturing process that…
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Artikel Jurnal
Nitric Acid Leaching Route for Nickel Extraction from Lateritic Deposit
This study attempts to recover nickel from lateritic ore exploited from North Konawe, Celebes, applying the acid leaching method. Prior to acid leaching, the lateritic deposit of a given size (≤ 200 mesh) was heated in a furnace at 600°C to yield laterite concentrate. The acid leaching route…
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Artikel Jurnal
DESIGN COOLING TOWER OF THE MECHANICAL DRAFT TYPE COUNTER FLOW TO ACHIEVE AMBIENT TEMPERATURE
The application of cooling towers in various industries has been widely used to meet needs. The main purpose of this study is to create an effective cooling tower in the water-cooling process by using the counter flow principle to meet the need to reduce the water temperature of the cooling system…
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Artikel Jurnal
Comparative Analysis of Creep Deformation in Ferritic Martensitic Steel Across BM, WJ, and HAZ Regions at 570°C
Creep is a time-dependent deformation in which failure can occur in years. The probabilistic assessment was a typical method for predicting creep deformation. The prediction was conducted by extrapolating the short-time creep laboratory test to the long-time data. A small deviation of extrapolation…
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Artikel Jurnal
Study of Heat Transfer Characteristics of Heat Exchanger Tube with Variations of Fin Distance Using Circular Fin
Compact Heat Exchangers (CHE) are commonly used in various industries. Therefore, enhancing the performance of heat exchangers is crucial, one of which is by adding fins to the outer surface. This study focuses on the effect of fin spacing configuration on the heat transfer rate and overall heat…
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Artikel Jurnal
Characteristics of Two-Phase Flow Patterns in a Horizontal Microchannel with Cross-Sectional Area Expansion
Research on two-phase flow in microchannels has developed rapidly and been applied in various industrial fields, focusing on the unique characteristics of gas-liquid two-phase flow, including the influence of changes in cross-sectional area and rheological properties of non-Newtonian fluids on flow…
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Artikel Jurnal
Design of a Portable Quick‑Release Drive System for Conventional Manual Wheelchairs to Enhance Comfort and Accessibility
Conventional manual wheelchairs are widely used for indoor mobility; however, their operation is limited by the user’s ability to generate propulsion force, which affects travel range and the level of independence. This study presents the design and development of a portable drive system equipped…
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Artikel Jurnal
Theoretical, Numerical, and Experimental Analysis of Stress Distribution in Rectangular Beams under Different Loading Positions
In structural design, appropriate criteria are required to ensure that structures can safely withstand applied loading conditions while achieving optimal performance. Stress analysis is one of the most important aspects of structural engineering design. Stress in structural components can be…
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Artikel Jurnal
The Effect of Minimum Quantity Lubrication (MQL) and Depth of Cut on Surface Roughness in Turning of AISI 1020 Steel
This study aims to investigate the effect of the Minimum Quantity Lubrication (MQL) method using wasted cooking oil and depth of cut on surface roughness in the turning process of AISI 1020 steel. The tests were conducted on a manual lathe machine with a spindle speed of 800 rpm, a cutting length…
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Artikel Jurnal
ANALYSIS OF TENSILE STRENGTH AND MACRO STRUCTURE OF 6061 ALUMINUM ALLOY RESULTING FROM GMAW AND GTAW WELDING
Aluminium 6061 material is often used in the shipbuilding industry, especially as a construction frame on ships. GMAW (Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding) are widely used in welding aluminium alloy materials. This research aims to determine and analyse the effect of V, X, and…
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Artikel Jurnal
An Experimental Study of Ventury Ejector Performance with Varied Dimensions and Primary Pressures
Supersonic suction from the ejector nozzle chamber creates a high vacuum effect. Supersonic suction is the high-speed suction from secondary suction effect of high-pressure flow velocity from the primary flow nozzle. Velocities in supersonic jet cores can reach more than 238 m/s. Many industrial…
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Artikel Jurnal
A COMPREHENSIVE REVIEW: EQUATIONS OF PIPE VIBRATION INDUCED BY INTERNAL FLUID FLOW
Some researchers have developed analytical models for the vibration of pipe conveying fluid internal flow with many forms of equation for different behavior of vibration, boundary conditions and assumptions. To predict the behavior of vibration with different boundary conditions and assumptions, it…
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Artikel Jurnal
Optimization of Complex Engine Guard Feature Formation Using Single Point Incremental Forming (SPIF) with the Ls-Dyna Simulation Method
One of alternatives for sheet material forming is using single point incremental forming (SPIF). This process is suitable for small-scale sheet metal product manufacturing because it can be done on a CNC Milling machine. There is few research has been done in SPIF with the simple feature products…
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Artikel Jurnal
RSM Based Modeling of Dimensional Deviation in CNC Milling Operation
Dimensional deviations remain a common issue in CNC milling operations, even with the use of modern machines equipped with enhanced capabilities. Developing a predictive model to determine dimensional deviations based on selected machine parameters, including radial depth of cut, feed rate, axial…