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Makara Journal of Technology
Published by Universitas Indonesia
ISSN : 23552786     EISSN : 23564539     DOI : https://doi.org/10.7454/mjt
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
MAKARA Journal of Technology is a peer-reviewed multidisciplinary journal committed to the advancement of scholarly knowledge and research findings of the several branches of Engineering and Technology. The Journal publishes new results, original articles, reviews, and research notes whose content and approach are of interest to a wide range of scholars. It also offers rapid dissemination. MAKARA Journal of Technology covers the recent research in several branches of engineering and technology include Electrical & Electronics Engineering, Computer Engineering, Mechanical Engineering, Chemical & Bioprocess Engineering, Material & Metallurgical Engineering, Industrial Engineering, Civil & Architecture Engineering, and Marine Engineering. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the engineering & technology and the effect of rapid publication on the research of others. This journal, published three times each year, is where readers look for the advancement of discoveries in engineering and technology.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
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Search results for , issue "Vol. 26, No. 2" : 6 Documents clear
New In-situ Heating Apparatus Setup for Universal Testing Machine Algarni, Mohammed
Makara Journal of Technology Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

This paper presents a novel idea of establishing a low cost and highly efficient heating apparatus. This apparatus can be used along with any universal testing machines (UTM) for various tests, such as fracture, fatigue, torsion, and shear. This low cost and highly efficient option for researchers in solid mechanics may be used in a broad range of promising research areas. Moreover, this novel apparatus is beneficial for all researchers interested in high-temperature solid mechanics and applications. An extensive literature review presented reveals the existing heating apparatus currently used in mechanical testing labs globally, along with their pros and cons. A comparative study of the new heating apparatus and the current ones shows the advantages of the new heating apparatus and reveals how it overcomes the drawbacks of the existing heating apparatuses. The setup and connection of the new heating apparatus illustrate its secure operation and its easy commercial acquisition.
Three-phase AC Induction Motor Speed Control Based on Variable Speed Driver mohammed, abdelrahim ahmed, ate; Gafar, Rihab; Sun, Xiuyun; Abozead, Tahleel
Makara Journal of Technology Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

Massive loss of power is a concern for many countries because of the high power consumption of alternating current (AC) motors. The motor speed should be controlled to alleviate this problem and save more power. This paper proposes a simple simulation for a variable speed driver (VSD) to control the three-phase induction motor speed. The VSD consists of three parts. The converter performs from full bridge diodes to convert single-phase AC voltage into direct current voltage, and then this voltage is filtered by the RL filter and transferred to the last part, which is the inverter. The model was simulated by using MATLAB/Simulink. Findings show that the VSD controller provides sufficient control over the AC induction motor speed.
Numerical Study of Paraffin Wax Melting in a Cavity with A Gradient of Hot Wall Inclination Korawan, Agus Dwi
Makara Journal of Technology Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

The melting of a phase change material (PCM) in a cavity with a gradient of hot wall inclination was simulated numerically using five models, namely, Model-A, Model-B, Model-C, Model-D, and Model-E with gradients of −2, −4, ∞, 4, and 2, respectively. The PCM was paraffin wax, which was melted using an enthalpy porosity technique with a pressure-based method. Model-A was found to be the best model. For the completion of the melting process, the models were assigned with the liquid fraction of 1. Model-A required the shortest time, followed by Model-B, Model-C, Model-E, and Model-D, respectively. Compared with Model-C, Model-A was 9.4% faster, Model-B was 3.8% faster, Model-D was 2.3% slower, and Model-E was 3.2% slower.
Evaluation of Material Request Order to Support Sustainable Construction Susilowati, Fajar; Anggraeni, Nur Nahdiah
Makara Journal of Technology Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

This study was conducted on one of Indonesia’s apartment projects, in which reinforced concrete is the main structure. Based on existing project data, this project experienced a decline in the construction work’s progress, thus reducing the project’s overall progress. This decline occurred because the delivery of concrete reinforcement material was delayed. This study aimed to determine the process of material request order and its relationship with the work implementation, as well as the factors that influenced the delayed arrival of concrete reinforcement material at the project site. The method used in this study was observation and interview. Data were analyzed by comparing the conditions in the field with the standard operating procedure. Analysis results revealed that the material request order process in this project was implemented excellently, and it followed the existing standard operating procedure. However, material request orders were delayed due to several factors, such as an increase in material price, lack of coordination/communication, and weather disturbances. The results of this study can be used to improve a company’s performance in terms of achieving sustainable construction.
Experimental Analysis of the Effect of ISOFIX Child Restraint System’s Harness Tension on Child Occupant’s Chest Acceleration in Frontal Collisions Wei, Zhe
Makara Journal of Technology Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

The research seeks to ascertain the relation between ISOFIX child restraint system’s harness tension and child occupant’s chest acceleration in frontal collisions, and analyze the potential risks posed by different harness tensile forces. It is important to verify and validate the effects of harness tensions on child occupants’ potential injuries, since child restraint system’s user manual does not indicate the extent to which the adjusting belt should be pulled generally, thus making it possible to cause the harness tensile force to be applied arbitrarily. Hence, public awareness of the issue should be improved. A test scheme was devised and conducted to collect necessary information about P1.5 dummy in frontal collisions. The pulling forces applied to the adjusting belts were set at 3 different levels. Chest accelerations were acquired and compared to analyze the effects. Based on test results, the relation was ascertained and validated. Additionally, suggestions were made about adjusting the harness tension and appropriate use of ISOFIX child restraint system.
Interactive Software-based Modeling for Gait Analysis of Musculoskeletal Structures Mirza, Nada Masood; Ali, Adnan; Ishak, Mohamad Khairi
Makara Journal of Technology Vol. 26, No. 2
Publisher : UI Scholars Hub

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Abstract

Software for interactive musculoskeletal modeling applies diverse scientific and technological concepts to stimulate the movement of musculoskeletal figures. Several tools are available for biomechanical analysis in studying motion and capturing the musculoskeletal representation data to facilitate further evaluation for muscle activation. Musculoskeletal software, such as the OpenSim model, animates, and measures in 3D the structural movement of bones, muscles, joints, ligaments, and such structures in the human body. Users apply graphical interfaces to manipulate the movement science for fast and accurate analysis. OpenSim simulation software features a user-friendly interface to allow the proper clinical application in biomechanics and rehabilitation research. The exploitation of the potential features and outputs is significant to optimize electromyography technology for musculoskeletal simulation. Emphasis on testing fundamental hypotheses with posture experimentation and simulation encourages the adoption of OpenSim in various biomechanical models.

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