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EPI International Journal of Engineering
Published by Universitas Hasanuddin
ISSN : 26155109     EISSN : 26210541     DOI : https://doi.org/10.25042/epi-ije
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
EPI International Journal of Engineering (EPI-IJE) is published and managed by Center of Technology, Faculty of Engineering, University of Hasanuddin (CoT, FoE, UNHAS), Indonesia. The main objective of this international journal is to create publishing opportunities and to disseminate knowledge in engineering-related topics collected from all over the world. A wide range of topics may be accepted, including from both conventional engineering and newly developed fields. Multi-disciplinary and Inter-disciplinary fields are encouraged to submit, and the topic on engineering education is also welcome. Manuscripts should be in English only. This journal system is open free-access to public in electric form, and the paper-form journal is also available. No fee is charged to accepted papers. On acceptance of submitted paper, authors are asked to submit a short copy-right form, but the authors have rights to reuse their work. The submitted manuscripts are under peer review at least by two reviewers, and publication is made biannually.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 168 Documents
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Mine Scheduling of Lateritic Nickel Ore in The Mawar Block of PT Ang and Fang Brother Site Lalampu, Central Sulawesi Province, Indonesia Anas, Aryanti Virtanti; Syaifullah, Nanda Syafriana; Amalia, Rizki; Sutardjo Tui, Rini Novrianti
EPI International Journal of Engineering Vol 7 No 1 (2024): Volume 7 Number 1, February 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022024.03

Abstract

PT Ang and Fang Brothers planned to open a new pit of lateritic nickel ore in Mawar Block. Mine scheduling of open-pit mines is an important thing in surface mine planning so the purpose of this research is to provide an overview of pit design and mining sequences, amount of production and number of equipment allocated in each sequence. The production targeted by the company was 50,000 tons by considering the mine recovery factor of 90%. Mine scheduling requires several data, namely cycle time, loss time, block model, equipment specifications and availability, slope and mine haul road geometry, and topography. The data used to design pit limits, mining sequences, and production scheduling. Based on the design of the mine pit, the total overburden that must be removed is 365,589 bcm and the total laterite nickel ore that must be stripped is 169,240 tons with a stripping ratio of 2.2:1 which is divided into three mining sequences. Total tonnage of lateritic nickel ore in the first to the third sequence is 55,677 tons, 55,518 tons, and 58,045 tons with overburden of 143,764 bcm, 136,055 bcm, and 85,770 bcm respectively. The equipment fleet of the first to the third sequence is 4 units’ loader with 17 units’ hauler, 4 units’ loader with 17 units’ hauler, and 3 units’ loader with 13 units’ hauler respectively.
Effect of Temperature Variation PWHT Dissimilar Welding Low Carbon Steel ASTM A36 with ASTM A240 Type 316L Wahab, Abd.; Arma, Lukmanul Hakim; Arsyad, Hairul; Othman, Rozaini Bin
EPI International Journal of Engineering Vol 7 No 1 (2024): Volume 7 Number 1, February 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022024.05

Abstract

Abstract ASTM A36 low carbon steel is steel commonly used in construction, and the austenitic stainless steel 316L series is stainless steel with good corrosion resistance. Joining two dissimilar metals is unavoidable because it can provide good mechanical properties and resist corrosion at a low cost. This study studied the effect of variations in post-welding heating process temperature (PWHT) on mechanical properties and microstructure by shield metal arc welding (SMAW) low carbon steel ASTM A36 with ASTM A240 type 316L with a thickness of 6 mm with a single V connection and using an E308L-electrode. 16. The PWHT process was carried out to improve the weld results with variations in heating temperatures of 400, 600, and 900˚C with a holding time of 1 hour with 15% dromos quenching media. Testing mechanical properties includes hardness test using micro Vickers method on low carbon steel base metal, HAZ, weld metal, HAZ, and stainless steel base metal and impact test using Charpy method. Optical microscopes were used to study the microstructure of the area of the base metal, HAZ, and weld metal viewed using a laser scanning microscope. The test results show that the highest average hardness value in the weld metal area is in the specimen without PWHT with a value of 124.96 HV and samples with a PWHT temperature of 400˚C on the weld metal 121.63 HV and the lowest in the PWHT specimen 900˚C 76.17 HV. in the HAZ 316L area. The hardness value of the weld metal without PWHT and PWHT indicates that the hardness value is higher than the two-parent metals. While the impact test with PWHT specimens at 400˚C had higher impact energy than specimens without PWHT by 6.50 %, and the lowest was 16.26% at the optimum temperature of 900˚C, the shape of the samples showed ductile cracks.
Post-Occopancy Evaluation of Hasanuddin University Urban Park Nadji, Etiwu; Radja, Abdul Mufti; Harisah, Afifah
EPI International Journal of Engineering Vol 6 No 2 (2023): Volume 6 Number 2, August 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082023.06

Abstract

Urban Park is one of the public open spaces that play a role in preserving the environment. Hasanuddin University Urban Park is known as the lungs of Makassar City. The key of a public open space is influenced by a few ideal criterias based on the ideal criteria for public open space according to Kathleen Madden and the Project for Public Space used in this study, such as: (a) Sociability (social interaction that occurs); (b) Uses and activities; (c) Access and Linkages, and (d) Comfort and Image (a comfortable and interesting place to visit). This study aims to (1) Identify the condition of the Hasanuddin University Urban Park based on the ideal criterias for public open space according to Kathleen Madden and Project for Public Space; (2) Describe the influence of visitor behavior refer to the condition of Hasanuddin University Urban Park. This study uses a descriptive analysis methods and place centered mapping analysis methods, the data collection techniques is using data triangulation (observations, interviews, and secondary data). The result and discussion shows that the condition of the Hasanuddin University Urban Park refer to the ideal criteria for public open space according to Kathleen Madden and Project for Public Space, is some aspects of intangibles and aspects of measurements have not met the criteria. Visitor behavior that occurs in urban parks is influenced by the condition of existing park facilities and attributes such as visitor parking behavior, visitor environmental hygiene behavior and visitor alert behavior. Keywords: Evaluation of post-occupancy; ideal criteria for public open space; urban parks; visitor behavior.
Pb Adsorption of Coffee Peel Derived Activated Carbon by Varying KOH Concentration Dwidiani, Ni Made; Wardana, I Nyoman Gede; Suardana, Ngakan Gede Putu; Santhiarsa, I Gusti Ngurah Nitya; Sibarani, Relius Zakaria
EPI International Journal of Engineering Vol 7 No 1 (2024): Volume 7 Number 1, February 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022024.01

Abstract

Turning biomass waste into added value product is crucial as it is not only beneficial to the environment but also to the economy. Coffee peel is a waste that has excellent potential to produce activated carbon. Activated carbon is carbon that has gone through an activation process and has a large surface area and higher adsorption rate. The high need for activated carbon in overcoming waste problems makes it useful to reduce its environmental impact. Activated carbon is widely used in water filtration including heavy metal Pb and Cd. The aim of this research is to study the impact of KOH concentration on Pb adsorption of activated carbon derived from coffee peel. KOH activator could enhance the performance of the activated carbon. The KOH activator concentration is varied to obtain the best-surface structure in activated carbon. The KOH concentration is 2,3 and 4 molars. Each specimen will undergo the same carbon activation process by maintaining the carbonization and drying temperature. Then at the activation stage, variations of KOH concentration will be mixed with the activated carbon and soaked for 24 hours with a weight ratio of KOH to charcoal of 1,5 to 1. The result shown that fixed carbon of 2,3,4 molar KOH concentration are 45.99%, 58.22%, 42.99% respectively, while Pb adsorption are 96.56%, 98.34% and 96.45%. In addition, the adsorption rate of activated carbon is proportional to the concentration level of the KOH solution. However, there is a limit on adsorption concentration, so there is a significant decrease when KOH exceeds the saturation point. Based on this research, Pb adsorption of coffee peel derived activated carbon is quite significant even though the amount of fixed carbon relatively low. Keywords: Activated carbon; coffee peel; KOH; Pb
Analysis of Ability to Pay and Willingness to Pay in Trans Sulawesi Train Makassar - Parepare Route Amaliah, Rizki; Widyastuti, Hera
EPI International Journal of Engineering Vol 6 No 2 (2023): Volume 6 Number 2, August 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082023.03

Abstract

The Trans Sulawesi train on the Makassar – Parepare route will traverse four significant stations with a planned length of ± 144 km and start operating in October 2022. Currently, it is not known the amount of travel fare applied to the Makassar - Parepare route. An analysis study of the ability to pay and willingness to pay for the Trans Sulawesi train for the Makassar - Parepare route aims to determine the value of the ability and willingness to pay for prospective service users to determine the Trans Sulawesi train rate. The data was collected by using interview surveys and distributing questionnaires through revealed preference and stated preference approaches. The ability to pay value was analyzed using the household budget method, and the willingness to pay value was analyzed based on the respondent's perception approach. Based on the results of the study obtained, the value of the ability to pay (ATP) of Rp. 144,279 and the value of willingness to pay (WTP) of Rp. 61,426.
Impact of Pulau Balang Bridge Operations on Kariangau – Penajam Ferry Service Agusty, Cindy Lionita; Sitepu, Ganding; Idrus, Misliah
EPI International Journal of Engineering Vol 6 No 1 (2023): Volume 6 Number 1, February 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022023.06

Abstract

Pulau Balang Bridge is access to the Indonesia’s Capital City of IKN and connects Balikpapan to Penajam. So far, there are several alternative transportations, from the Balikpapan area to Penajam and vice versa, one of which is using a ferry, which takes 1.5 hours and added time to the queue. Another alternative is to use a speed boat, the travel time is about 15 minutes. Speed boats are only for passenger purposes and substandard safety. Currently, the number of passengers is quite significant for the Balikpapan - Penajam Ferry Service, after the Pulau Balang Bridge operation, must significantly impact the shipping industry in the Balikpapan - Penajam area. Several alternatives for transportation to connect Balikpapan - Penajam Paser Utara, which has a high annual demand for many ships. This study aims to predict the demand for the Kariangau - Penajam Ferry Service after operating the Pulau Balang bridge and determine the optimization of ships on demand for the Kariangau - Penajam Paser Utara Ferry service after the Pulau Balang bridge operates. The method used in this study is forecasting with linear regression and descriptive or survey research. Assuming there is no Pulau Balang bridge, demand for the Kariangau – Penajam ferry service for passengers grows 2% per year, two-wheeled vehicles grow 4% per year, and four-wheeled vehicles grow 1% per year. Projections of passenger demand in 2026 and 2031 are likely to be optimistic that the demand will decrease to 77% and possibly 20% pessimistic. From the distance and time of ferry service users, 7 routes (49%) of ferry service users still use the ferry line, and 5 routes (51%) of ferry service users switch to the bridge if it is already in operation. Meanwhile, from the results of direct interviews, the demand for the Kariangau - Penajam Ferry service was 23%. They would switch, 33% of respondents would take turns using ships and bridges, 20% would still use ferries, and 24% had yet needed to choose. Currently, 19 ships are operating at the Kariangau - Penajam Ferry service. For an optimistic possibility in 2026 and 2031 the demand for ships if the Pulau Balang bridge operates is 16 ships. However, for a pessimistic possibility, the ships needed to operate are only 4 ships per day.
Tug-Barge Operating Costs based on Charterer Versus Ownership Perspective. A Case Study: Nickel Ore Transport Boenaga-Fatufia Route Sitorus, Chris Jeremy Verian; Idrus, Misliah; Chaerunnisa, Andi Sitti
EPI International Journal of Engineering Vol 6 No 1 (2023): Volume 6 Number 1, February 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022023.07

Abstract

The Tug-barge operating costs for nickel ore transhipment at Boenaga-Fatufia are based on charter and shipowner. A comprehensive study on Tug-barge investment feasibility needs to focus on the most profitable option. This study aims to determine the feasibility of investing in a Tug-barge, considering a charter Tug-barge with shipowner (newbuilding tug-barge and secondhand Tug-barge is feasible compared to a new building Tug-barge and charter Tug-barge. The highest NPV is for the secondhand Tug-barge, IDR 18.642.830.529; rhe secondhand Tug-barge also gas the highest IRR value of 20%. The secondhand Tug-barge has the fastest Payback Period, Which is 4.18 years.
Choosing the Best Functions for the Rayleigh-Ritz Vibration Analysis of Beams Mochida, Yusuke; Eisenberger, Moshe
EPI International Journal of Engineering Vol 6 No 1 (2023): Volume 6 Number 1, February 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022023.05

Abstract

The Rayleigh-Ritz Method is used extensively for the vibration analysis of structures. The accuracy depends on the assumed functions. In this work several different groups of functions are examined and compared for the accuracy of the resulting natural frequencies, and for the overall mode shape error norms calculated with respect to the known exact solutions. It is concluded that a set that combines low order polynomials, odd cosine and odd sine functions, or, even cosine and even sine functions, is more likely to yield the best accuracy and convergence of both frequency and mode shapes for a general beam structure.
Rectangular Plate Rebound Vibration Suppression using Double Collision Phenomena Matsumoto, Hiroki; Kawakita, Kazuhiro
EPI International Journal of Engineering Vol 6 No 2 (2023): Volume 6 Number 2, August 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082023.02

Abstract

The rectangular plate is a model of the internal mirror of an SLR camera. The internal mirror model is a rectangular metal plate that rotates on its own axis around one side of a rectangle. When the mirror hits to the stopper, a rebound vibration occurs. The double collision method is introduced to reduce the rebound vibration. The timing of the double collision varies the amount of rebound vibration. 3-D Particle Image Velocimetry (3-D PIV) and 3-D motion analysis are used to investigate the rebound phenomena. 3-D PIV measures the rebound vibration velocity of the mirror model surface at the moment of collision. 3-D motion analysis is used to measures the rebound vibration displacement at the moment of collision. When the rebound vibration is small, the low-velocity region on the surface of the mirror model moves in the longitudinal direction. This indicates that the mirror model is undergoing wave deformation after the moment of collision. When the timing of the second collision is optimized, the deformation of the mirror model at the moment of collision is increased and the rebound amount is suppressed.
Identification of Thermal Comfort of Opens Space in Soppeng Regency Nurhasanah, Nurhasanah; Mulyadi, Rosady; Kusno, Asniawaty
EPI International Journal of Engineering Vol 6 No 2 (2023): Volume 6 Number 2, August 2023
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082023.07

Abstract

Thermal comfort is always associated with the climatic situation. Thermal comfort, known as a sense of comfort in thethermal situation in the surrounding environment, is also a necessity for space users. Open space is a place for spaceusers who must be able to create a comfortable situation, one of which is thermal comfort. Temperature, humidity, windvelocity, and radiation intensity are elements of the thermal environment, as well as human metabolism and clothinginsulation as human physical and physiological factors, are the six parameters of outdoor thermal comfort levelaccording to ASHRAE Standard. This research is a type of descriptive research that aims to explain the thermalconditions felt by the perpetrators of activities in one of the open spaces in the Soppeng Regency, the Ompo LakeTourism Area. The results obtained were from 349 respondents and as many as 216 respondents felt comfortable in themost comfortable temperature conditions in the range of 27.1 - 31˚C, with humidity > 70%, wind velocity 0.2 – 0.5 m/s,and radiation intensity <150 W/m2. Activity with a relaxed sitting (1 met) and moderate tropical clothes (0.3 – 0.5 clo).

Page 15 of 17 | Total Record : 168

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