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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 439 Documents
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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
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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.
Mechanical Behavior of Clay Soil Stabilized with Fly Ash and Bottom Ash Nugroho, Soewignjo Agus; Zulnasari, Azra; Fatnanta, Ferry; Putra, Andius Dasa
Makara Journal of Technology Vol. 26, No. 1
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Abstract

Soil is one of the most important aspects of an infrastructure given its functions of receiving and holding structural loads. However, not all soils have good physical and mechanical properties. To overcome those conditions, stabilization of the soil is practiced to meet the technical requirements. This study aims to determine the behavior of high plasticity clay stabilized with lime, fly ash, and bottom ash. These additives can be used as a stabilizing agent to increase soil strength. The percentage of additives varied from 5%–25% then mixed with clay and were tested through the (Unconfined Compression Strength (UCS) test. The UCS test was carried out with 6 treatments, including consecutively non-curing and unsoaked, non-curing and soaked, curing for 7 days and unsoaked, cured for 7 days and soaked, cured for 28 days and unsoaked, and cured for 28 days and soaked. Results show that the UCS value increased along with the span of curing time. Meanwhile, the soaking treatment of the sample decreased the UCS value.
Enhancement of Biogas Production Through Solid-State Anaerobic Co-Digestion of Food Waste and Corn Cobs Shitophyta, Lukhi Mulia; Salsabila, Anisa; Putri, Firanita Angraini; Jamilatun, Siti
Makara Journal of Technology Vol. 26, No. 1
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Abstract

Although biogas has been primarily produced through liquid anaerobic digestion, this method leads to the floating and stratification of fibers and non-homogeneous mixing, which can reduce the biogas yield. Alternatively, biogas can be produced by the solid-state anaerobic digestion (SS-AD) of organic material with a high solid content, such as corn cobs. We investigated the co-digestion of food waste and corn cobs as a biomass feedstock for SS-AD in biogas production. We measured the effects of the total solid (TS) content, percentage of food waste, and reduction in volatile solids (VS), from which we determined its appropriate kinetic model. We found that the SS-AD of food waste with corn cobs produced a high biogas yield of 543 mL/g VS at a TS content of 22% and a food waste content of 20%. The first-order kinetics model for biogas production during SS-AD of the tested corn cob and food waste yielded an R2 value in the range of 0.91–0.94. The main contributor to the biogas production during the SS-AD of the corn cobs and food waste was the reduction in VS. A positive linear relationship was observed between the biogas yield and the reduction of VS.
Simulation of Colonial Building Reconstruction in Jakarta Old Town Through Augmented Reality Prabawasari, Veronika Widi; Bahar, Yudi Nugraha
Makara Journal of Technology Vol. 26, No. 1
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Abstract

Augmented reality (AR) is a trending technology with many potential applications. In architecture, AR can help visualize and document historic buildings by virtual reconstruction. Colonial buildings in Jakarta Old Town are cultural heritage buildings that are vulnerable to damage by aging and environmental factors. The mitigation of this damage as the first step toward restoration is important. The storage and maintenance of records of threatened buildings for posterity are also important. The objective of this study is to develop a methodology for AR-based reconstruction. AR technology is implemented through mobile phones or smartphones. The modeling process is simple and interactive and has potential applications in both education and tourism. The reconstruction method of colonial buildings uses markerless AR and a database of historical knowledge of colonial architecture. The architectural style is identified using the database. Then, an AR-Reconstruction prototype, which provides a visual description of the building reconstruction process using 3D graphics animation models of colonial buildings, is developed. The model reproduces the building in its original condition and actual location. In the trial run, access to building details is delayed. Therefore, in the future, the geometric details and marker quality need to be optimized.
Control Strategy for Solar Energy-Saving Lamps for Optimized Energy Utilization and Sustainability of Operation Durability: Indonesia Case Halimi, Burhanuddin; Purwadi, Agus; Heryana, Nana
Makara Journal of Technology Vol. 26, No. 1
Publisher : UI Scholars Hub

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Abstract

To solve the electrification ratio issue, the Indonesian government has promoted the use of solar energy-saving lamps. This study proposes a control strategy that adopts current reference time-based profiling for solar energy-saving lamps. For optimal energy consumption, the current reference profile is determined according to users’ daily energy requirements. From the aspect of user comfort, a gradual step reference profile is also introduced to provide a subtle change in lighting intensity level. The proposed control strategy can minimize energy consumption and optimize the operation durability of the system. The concept is verified by simulating four scenarios, the results of which demonstrate the effectiveness of the proposed control strategy. Computational simulation results indicate that Scenarios C and D which adopt the proposed time-based profiling can respectively reduce the daily energy consumption of the conventional control strategy by 47.14% and 39.79%, respectively. In terms of durability in providing electricity, both scenarios can continue to supply electrical power for two days without any solar irradiance. The proposed method can also improve customer service through the comfort provided in Scenario D.
Design and Implementation of I2C Bus Protocol on Master and Slave Data Transfer Based on FPGA Ishak, Mohamad Khairi; Kumar, Meenal Pradeep
Makara Journal of Technology Vol. 26, No. 1
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Abstract

This paper presents the design of the inter-integrated circuit (I2C) protocol with different types of features, such as combined messages, addressing modes, different data patterns and start addresses, clock frequencies, and types of modes between the field-programmable gate array (FPGA) and test card. Moreover, all these features can be randomized and run for long hours. The FPGA and the test card respectively act as master and slave. The design architecture comprises master and slave. The master generates a START condition, in which the serial data will transact between high to low levels and the serial clock will remain high. Then, the master also generates the STOP condition. Additionally, a few types of messaging modes, such as PIO read, PIO write, PIO write–read, and PIO read–write, are available. By contrast, the master also transfers and receives data to or from slave devices by using different addressing modes. The implemented addressing modes are 7 and 10 bits. This paper also focuses on randomizing the sent data byte and the start address. Particularly, data sending, reading, and writing operations are conducted and stimulated by capturing the signal using a logic analyzer. The signal is then examined and compared with the actual I2C protocol format. A stress test is performed by randomizing all the features and running for long hours (4 h). The stress test aims to stress the IP and ensure the health of IP.

Page 44 of 44 | Total Record : 439

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