EPI International Journal of Engineering最新文献

{"title":"Identification of Thermal Comfort of Opens Space in Soppeng Regency","authors":"Nurhasanah Nurhasanah, R. Mulyadi, A. Kusno","doi":"10.25042/epi-ije.082023.07","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.07","url":null,"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).","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"88 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140236748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Post-Occopancy Evaluation of Hasanuddin University Urban Park","authors":"Etiwu Nadji, A. M. Radja, A. Harisah","doi":"10.25042/epi-ije.082023.06","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.06","url":null,"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. \u0000Keywords: Evaluation of post-occupancy; ideal criteria for public open space; urban parks; visitor behavior.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"41 166","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Free Vibration of Annular Plates Constrained by Translational and/or Rotational Springs on Outer and Inner Edges","authors":"Yoshihiro Narita","doi":"10.25042/epi-ije.082023.05","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.05","url":null,"abstract":"This paper presents comprehensive lists of natural frequencies for vibration of thin isotropic annular plates with outer and inner edges elastically constrained by translational and rotational springs. A method is extended from a previously presented Ritz approach to include effects of the springs. In numerical examples, sixteen models are considered to cover all general cases of locating translational and/or rotational springs on outer and/or inner edges in addition to classical boundary conditions of free and simple supported edges. After convergence study and comparison test in specific cases are made to validate solution accuracy, frequency parameters of the sixteen models are summarized and frequency variations with increasing spring stiffness are illustrated.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"4 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140252919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Ability to Pay and Willingness to Pay in Trans Sulawesi Train Makassar - Parepare Route","authors":"Rizki Amaliah, Hera Widyastuti","doi":"10.25042/epi-ije.082023.03","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.03","url":null,"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.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"26 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Assessment of stone ash as a lightweight concrete constituent material with the addition of bestmittel additives","authors":"Budiman Budiman, James Williams Tiranda Patanduk","doi":"10.25042/epi-ije.082023.04","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.04","url":null,"abstract":"Technological advances in the field of building construction have developed very rapidly, so we need a construction technology that can reduce exploitation of nature. Utilization of stone ash is one of the new material alternatives in concrete mixtures with the addition of the bestmittel additive to accelerate drying in concrete. The purpose of this study is to determine the aggregate characteristics, specific gravity and compressive strength of concrete. The method used is laboratory experimental research with variations in stone ash samples of 5%, 10% and 15% to the weight of sand with the addition of 0.6% bestmittell additive to the weight of cement. The results showed that stone ash and bestmittell additives affect the characteristics of the concrete. The value of specific gravity increases with increasing percentage of stone ash, namely 1898.77 kg/m3 in normal concrete, 1911.35 kg/m3 of 5% stone ash concrete, 1922.34 kg/m3 of 10% stone ash concrete and 1927.06 kg/m3 m3 on 10% stone ash concrete. The compressive strength value of characteristic for the compositions AB 5%, AB 10% and AB 15% are 10.08 Mpa, 10.35 Mpa and 10.88 Mpa respectively, an increase compared to normal AB 0% concrete, namely 9.03 Mpa at 28 days.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"19 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rectangular Plate Rebound Vibration Suppression using Double Collision Phenomena","authors":"Hiroki Matsumoto, Kazuhiro Kawakita","doi":"10.25042/epi-ije.082023.02","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.02","url":null,"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.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"18 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Real-Time Data Acquisition and Monitoring of Three Phase Load Balance in Electricity Distribution","authors":"Dharma Aryani, Muhammad Yusril, Ahmad Rosyid Idris, Nur Aminah, Muh. Fajri Raharjo, Christian Lumembang","doi":"10.25042/epi-ije.082023.01","DOIUrl":"https://doi.org/10.25042/epi-ije.082023.01","url":null,"abstract":"A real-time monitoring mechanism for three-phase electrical power distribution panels is essentially needed to ensure that the power is evenly distributed across all phases, so that the efficiency of energy usage could be  maintained. This paper presents monitoring and data acquisition system for three-phase balance distribution. The system ensures balanced distribution of electrical power in order to enhance the efficiency and reliability of power systems. It leverages advanced technologies to collect, analyze, and report data, providing valuable insights into the performance of the power distribution network. Data acquisition is established by using sensor PZEM004T to measure the electricity parameters which is integrated with Arduino microcontroller. In addition, real-time monitoring system is visualized through dashboard data management for more informative data acquisition and analytic purposes. The performance is evaluated by testing the instrument and application at a distribution panel within a span of five days to monitor electrical parameters. The results show that real-time monitoring system for three  phase balance works perfectly to provide actual data and phase balance condition. The phase imbalance values are higher during the peak working hours where the loads are dynamics and extensively used.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"75 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Pulau Balang Bridge Operations on Kariangau – Penajam Ferry Service","authors":"Cindy Lionita Agusty, G. Sitepu, Misliah Idrus","doi":"10.25042/epi-ije.022023.06","DOIUrl":"https://doi.org/10.25042/epi-ije.022023.06","url":null,"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.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":" 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139623931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tug-barge operating costs based on Charterer Versus Ownership Perspective. A Case Study: Nickel Ore Transport Boenaga-Fatufia Route","authors":"Chris Jeremy Verian Sitorus, Misliah Idrus, Andi Sitti Chaerunnisa","doi":"10.25042/epi-ije.022023.07","DOIUrl":"https://doi.org/10.25042/epi-ije.022023.07","url":null,"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.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":" 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139623337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Hot Pressing on the Mechanical Properties of Metal Composites (AI/Sic) Result from Metallurgical Processes with Heating Temperature Variations in Bushing Making","authors":"Mangambari, L. H. Arma, M. Syahid","doi":"10.25042/epi-ije.022023.04","DOIUrl":"https://doi.org/10.25042/epi-ije.022023.04","url":null,"abstract":"The manufacture of Al/SiC alloy matrix composites has been widely carried out by researchers through powder metallurgy techniques. Bushings are slit cylindrical type bearings that serve to support the shaft. Bushings can be made by powder metallurgy, to get the perfect compaction process, compaction can be done by high temperature or Hot Pressing. A hot press will make the powder softer/plastic, making it easier during the perfect compaction process. For this reason, heating must be controlled in order to obtain a homogeneous product. Al/SiC metal matrix composites are alloyed materials of different types of materials, as matrices in this case are aluminum and as reinforcement are SiC particles (ceramics) made by powder metallurgy techniques. In this study, the Al/SiC composite composed of 70% Al - 30% SiC and Hot Pressing temperature variations of 100, 150 and 200°C with a pressure of 5000 kg and a holding time of 10 minutes. In the sintering process, the temperature used is 450, 500 and 550°C with a holding time of 2 hours. The results of this study show, in hardness testing it is known that the value of bushing hardness increases as the temperature of Hot Pressing increases.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":" 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139624050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}