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Determination of toll gate optimal number: A case study of Kertosono – Kediri toll road in Indonesia

IOP Conference Series: Materials Science and engineering 2021年第2期1098卷

作者： R E Wibisono S Soeparno M S D Cahyono Department of Civil Engineering Faculty of Engineering Universitas Negeri Surabaya Ketintang Surabaya 60231 Indonesia Program Study of Civil Engineering Faculty of Engineering Universitas Widya Kartika Surabaya 60112 Indonesia

The Kertosono-Kediri toll gate is currently under construction and operated in 2021. This toll gate is the entrance of vehicles that move from the industrial area of Mojokerto, Kertosono. For exit access this toll gate serves vehicles through the Maron Kediri toll gate, and the Sonoagung Pambon toll gate. If the toll booths operated are not in accordance with the amount of vehicle flow, it can cause poor vehicle traffic performance. The purpose of this study was to the optimal number of the gate in serving toll user transactions. The method in this study uses the number of optimal gate rules carried out by organizing data based on variable values and parameters traffic intensity per lane in the toll-gate section. These variables include the average number of vehicles received per hour and the average number of vehicles received per hour. Based on the analysis shows the number of toll booths for the Maron Kediri toll gate with 95 units/hour as many as 4 gates, 189 units/hour requires 8 gates, and 284 units/hour requires 10 gates. The Sonoagung Prambon toll gate with 118 units/hour as many as 4 gates, 236 units/hour requires 8 gates, and 353 units/hour requires 10 gates.

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Toward smart port: New national capital city of Indonesia

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AIP Conference Proceedings 2023年第1期2846卷

作者： Putra Apriyanto Habirun Okti Setyaningsih Cynthia Limas Ibnu Fauzi Okkie Putriani Civil Engineering Study Program Faculty of Engineering Universitas Atma Jaya Yogyakarta Jalan Babarsari No.44 Janti Caturtunggal Depok District Sleman Regency Special Region of Yogyakarta 55281 Indonesia National Research and Innovation Agency Jl. Graphic 02 Special Region of Yogyakarta 55281 Indonesia

The decision to relocate to the capital city of Indonesia needs to be supported by complete infrastructure, one of which is a technology-based smart port. Ports play an essential role in supporting the country’s economy. A port can be categorized as a smart port if it meets four main criteria: energy, operations, safety & security, and environment. This study will discuss the concept of smart port operation to realize the Master Plan of the New National Capital City of Indonesia (IKN) in terms of technology infrastructure, mobility, and smart city connectivity using the literature review method. The location of this research is in the Kaltim Kariangau Terminal (KKT), West Kalimantan Province. Most port activities in administration, loading, and unloading at the Kaltim Kariangau Terminal (KKT) still use conventional methods. There are three aspects of operations to fulfill smart port criteria: productivity, automation, and intelligent infrastructure. Productivity refers to the optimization level of activity on the port; RFID (Radio Frequency Identification) technology may increase the port’s productivity by decreasing the amount of time to identify every single container. AGV (Automated Guided Vehicle) with an automatic guiding device allow movement along a path that the system has determined to support the automation system. The application of automatic gates for checking goods in the entry gate supports the intelligence infrastructure to obtain data in real-time and quickly. The implementation of smart ports directly also supports the creation of IKN following the IKN Master Plan, which refers to Law No. 3 of 2022 concerning the State Capital covering aspects of Smart City implementation, Mobility and Connectivity, Technology, Information, Communication Infrastructure, and IKN Security Systems.

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Assessment of debonding failures in the sandwich plate of stern ramp door of ferry Ro-Ro using k-nearest neighbor algorithm

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AIP Conference Proceedings 2023年第1期2674卷

作者： Safri Adam Tuswan Tuswan Abdi Ismail Achmad Zubaydi Bambang Piscesa Aditya Rio Prabowo Information Technology Study Program Politeknik Aisyiyah Pontianak 78114 Pontianak Indonesia Department of Naval Architecture Institut Teknologi Sepuluh Nopember 60111 Surabaya Indonesia Department of Naval Architecture Universitas Diponegoro Semarang Indonesia Ship Machinery Study Program Faculty of Vocational Studies Indonesia Defense University Belu Indonesia Department of Civil Engineering Institut Teknologi Sepuluh Nopember 60111 Surabaya Indonesia Department of Mechanical Engineering Universitas Sebelas Maret Indonesia Surakarta Indonesia

The difficulty in controlling the proper bonding during manufacturing sandwich for ship structure is a major problem. One of the damage types that often occurs is debonding caused by the lack of the adhesive layer bond between the two faceplate materials and the sandwich core at the centre. Furthermore, the identification of damage in ship structure becomes essential to ensure the structural integrity and security issues. Based on the issues above, damage identification on the sandwich plate of Ferry Ro-Ro with several debonding ratios using the k-NN algorithm was proposed. The cross-validation method was used to check the validity of the proposed algorithm model in practice. The proposed models were analyzed with various k-fold values, k-NN values, and number of iterations to investigate the influence of the those parameters on the accuracy of the model. From the result, it can be found that increasing k-fold value is the best strategy to increase the accuracy of the model. However, increase number of neighbors (k) caused a bias so that the accuracy decreased. The tests resulted in the highest accuracy of 97.60% obtained at k-fold 11 with k=3 and 90 iterations. It can be summarized that the large number of k-folds and small k-NN parameters do not require large iterations to obtain high prediction results.

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Development of unconventional method for mapping the surface hydrothermal alteration in Wayang Windu geothermal field

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AIP Conference Proceedings 2021年第1期2363卷

作者： Syafrizal Arie Naftali Hawu Hede Nurul Magrfirah 1Research Group of Earth Resource Exploration Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Bandung 40132 Indonesia 2Master Program of Mining Engineering Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Bandung 40132 Indonesia

The Wayang Windu geothermal field, a geothermal system zone that produces energy sources located in Pengalengan and Kertasari Districts, Bandung Regency, West Java, Indonesia. The interpretation of surface minerals considers the alterations in volcanic rocks that occur at the research site. The distribution of surface minerals is closely related to the fracture pattern and the position of manifestation. The testing method that we used is the X-Ray diffraction method, which aimed to identify surface minerals. Silica (cristobalite, quartz, tridymite, opal), sulfate (alunite), oxide minerals, and clay minerals (kaolinite, smectite) are minerals that are often found on the surface. Native sulfur is often found in the primary manifestation of the crater. X-Ray Fluorescence is used to determine the main elements and traces in a sample. Andesite and andesite-basaltic-rock are rock types that are found in the research area. The XRF analysis results show that the SiO2 distribution is inversely proportional to the Al2O3, Fe2O3, and K2O distributions.

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Project Evaluation and Review Technique (PERT) Analysis in the renovation project of the Church of St. John the Evangelist, Jakarta

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IOP Conference Series: Earth and Environmental Science 2021年第1期794卷

作者： Yosica Mariana Sigit Wijaksono Architecture Department Faculty of Engineering Bina Nusantara University Jakarta Indonesia 11480 Professional Engineer Program Study Program Faculty of Engineering Bina Nusantara University Jakarta Indonesia 11480

The renovation of the St. Yohanes Evangelist Church project located on 197, Melawai Street Kebayoran Baru, Jakarta with a building area about 1480.9 m2 was chosen as a research object because the Church Construction Committee wanted to accelerate the renovation project from 2 years 5 months targeted to 1 year 5 months. This is because the Church of St. John the Evangelist as a place of worship can be immediately used again. The PERT method can be used to manage projects more efficiently and effectively; to be able to know the possibility of accelerating the duration of the project carried out on activities in the critical path and the shortening of the duration of each work on each alternative is equalized. In this study, the critical path compression step of the network using Microsoft Project and the results of the Project Evaluation and Review Technique (PERT) method, obtained a probability of 99.88%, so the renovation project of Saint John Evangelist Church can be an accelerated project to 1 year 5 months.

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Mineral water production for health therapy based on nanomaterial filters

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AIP Conference Proceedings 2023年第1期2748卷

作者： Mohamad Amin Dewi Nawang Arum Ihya Fakhrurizal Amin Ahya Zhilalikbar Amin Ekowati Retnaningtyas Department of Biology Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Jl. Semarang No. 5 Malang 65145 Indonesia Poltekkes Kemenkes Malang Malang Indonesia Faculty of Medicine Universitas Indonesia Jakarta Indonesia Study Program of Informatics Engineering Faculty of Computer Sciences Universitas Brawijaya Malang Indonesia

Clean water is one of the most important needs, including for daily drinking, because 70-80% of the human body is water. There are many benefits of consuming adequate drinking water for health. Consuming clean and healthy water is one of the keys to getting a healthy body, because water also plays a role in oxygen transportation throughout the body. To produce clean and healthy water, technological innovations are needed, one of which is to use a nano filter-based device which can reduce solutes, colour, hardness and high metal ions by up to 70%. The purpose of this research is to produce drinking water that is healthy and can be useful in health therapy with nano material-based filters. The resulting water product is drinking water with a pH of 8+. This nano material-based tool has been tested using 3 water samples, namely well water, PDAM water and river water. The results showed that well water with a pH of 8.71, TDS (total dissolved solid) 282 and a test of 4 heavy metals (Pb, Cu, Zn and Cr) were below the threshold and the results after filtering were the most ideal among other water samples and recommended for consumption that can afford for health therapy.

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Numerical study of Temperature Profiles of Transient Flow in the Geothermal Oilfield

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IOP Conference Series: Earth and Environmental Science 2021年第1期732卷

作者： J Hendrarsakti M Rahma Faculty of Mechanical and Aerospace Engineering Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia

Some petroleum wells that are no longer productive still have heat in their formation rocks. Those heat can be extracted and utilized by injecting working fluid into the wellbore. The current study's objective was to create a 2D numerical calculation program for transient flow temperatures inside the well then it was used to calculate the temperature distribution in oil and gas fields in the Arun field and BK Area. The injected fluids were modeled as a double-pipe heat exchanger. Heat transfer processes inside the wellbore were convection in the inner pipe and the annulus and conduction in the pipe walls and rock formations. The computational calculation used a finite difference method. The computation results were then compared with calculations from the literature. After being validated, the program was used to calculate the Arun field and BK Area temperature distributions. This study found that compared with the reference literature, the current results had a similar optimum temperature range of 130°C-160°C but had different profiles shape with an average deviation of 12%. In the Arun fields, simulation results indicated that the field could reach temperatures between 90°C-120°C and was classified as a medium-temperature geothermal source. BK Area could reach optimum temperatures between 50°C-80°C and be classified as the low-temperature geothermal.

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The enhancement of phycocyanin yield and purity from Spirulina platensis using freeze-thawing method on various solvents

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AIP Conference Proceedings 2021年第1期2344卷

作者： Dianursanti Maulina Aini Hafidzah Bioprocess Engineering Study Program Department of Chemical Engineering Faculty of Engineering Universitas Indonesia. Kampus UI Depok West Java 16424 Indonesia

Phycocyanin is a pigment compound that can be found from Spirulina platensis microalgae. It has been used for food colorant, cosmetic dye and fluorescence reagent for clinical diagnosis. Phycocyanin can be extracted using various procedure that was affected by many factors, one of them is the type of solvent that was used in the extraction process. This research will study the usage of different solvents, using sodium phosphate buffer and calcium chloride. The extraction method used in this research is freeze-thawing. The parameters of this extraction are phycocyanin yield and purity. The obtained result shows a higher yield of phycocyanin from extraction using phosphate buffer, with the value of 35.31 mg/g, and a higher phycocyanin purity from extraction using CaCl2 with the ratio of 2.6.

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Design strategies and willingness to pay for circular economy service policies in sustainable tourism

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Environmental Challenges 2025年 18卷

作者： Suhardono, Sapta Phan, Thi Thanh Thuy Lee, Chun-Hung Suryawan, I Wayan Koko Environmental Sciences Study Program Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta 57126 Indonesia Faculty of Natural Resources & Environment Dong Nai Campus Vietnam National University of Forestry Bien Hoa Dong Nai 810000 Viet Nam Department of Natural Resources and Environmental Studies College of Environmental Studies and Oceanography National Dong Hwa University Taiwan Hualien 97401 Taiwan Department of Environmental Engineering Faculty of Infrastructure Planning Universitas Pertamina Jalan Sinabung II Jakarta Terusan Simprug 12220 Indonesia Center for Environmental Solution (CVISION) Universitas Pertamina Jalan Sinabung II Terusan Simprug Jakarta 12220 Indonesia Center for Interdisciplinary Research on Ecology and Sustainability College of Environmental Studies and Oceanography National Dong Hwa University Taiwan Hualien 97401 Taiwan

The transition towards a circular economy within the tourism industry is increasingly seen as essential to achieving sustainable development goals. This study explores the relationships between various design strategies, tourists' willingness to pay (WTP) for sustainable practices, and their participation in circular economy activities. Using Structural Equation Modeling (SEM) to analyze data collected from 640 tourists in Bali, the research identifies the critical factors that influence tourists' engagement with sustainability. The findings reveal that design strategies focused on longevity, serviceability, reusability, and material recovery significantly enhance WTP for sustainable practices. In turn, WTP is shown to be a key driver of participation in circular economy activities, such as purchasing recycled items and green purchasing behaviors. However, barriers such as cost concerns, lack of awareness, and limited incentives pose significant challenges to widespread adoption. © 2025 The Authors

关键词： Circular economy Design strategies Structural equation modeling Sustainable tourism Willingness to pay

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The potential of coffee waste composting technology using microbial activators to reduce solid waste in the coffee industry

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IOP Conference Series: Earth and Environmental Science 2021年第1期802卷

作者： N Amalia N F Widialip N Safira N Citrasari S Hariyanto Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia Study Program of Biology Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia

The coffee industry in Sidoarjo produces coffee waste as coffee ground, coffee husk, and coffee return with the solid waste generation of about 5044.3 Tons/year. The coffee waste characters resemble organic waste, so it has potential as a composted raw material. This study aims to determine the selected variation raw material composition from the coffee industry based on Indonesian National Standard (SNI) Number 10-7030-2004 and the recycle potency of the coffee industry solid waste using composting technology. The research variables are the modified composting method (open windrow composting and Bacary Italian) and the co-composting method. The result of this research for all treatments showed that the concentration range of pH value 6.92-9.54, moisture 34.78-66.60%, C-organic 17.75-33.82%, N 1.45-2.93%, C/N ratio 10-13, P2O5 0.13-0.31%, and K2O 0.89-2.89%. The selected variation raw material composition of bio compost based on the compliance to SNI 10-7030-2004, which is 1.5 kg coffee ground + 1.35 coffee return + 0.15 kg coffee husk + 3 mL EM4 (K10). Based on K10 as the selected variation raw material composition of bio compost, the coffee industry solid waste recyclable is coffee ground 0.64%, coffee husk 0.20% and returned coffee 100%.

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