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Monitoring of water quality and plankton composition in Porong Estuary, Sidoarjo

AIP Conference Proceedings 2025年第1期3186卷

作者： Uun Yanuhar Muhammad Musa Heru Suryanto Nur Sakinah Junirahma Nico Rahman Caesar Aquatic Resources Management Faculty of Fisheries and Marine Sciences Brawijaya University Malang Jl. Veteran Malang 65145 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang Malang 65145 Indonesia Master Program of Aquaculture Faculty of Fisheries and Marine Science University of Brawijaya Jl. Veteran Malang 65145 Indonesia Doctoral program of Environmental Science Postgraduate Program University of Brawijaya Jl. Veteran Malang 65145 Indonesia

Disposal of Lapindo mud which carries nutrients and other dissolved organic matter into the Porong estuary, can cause the death of aquatic organisms due to high contamination and disturbance of aquatic ecosystems. The presence of phytoplankton can explain the current condition of the Porong Estuary. The purpose of this study was to report the water quality and plankton composition of the Porong estuary. The method used in this study is a descriptive survey method. Determination of sampling points using the appropriate sampling method at three stations. The research variables observed included water quality parameters such as temperature, total dissolved solids (TDS), total suspended solids (TSS), total organic matter (TOM), pH, dissolved oxygen (DO), carbon dioxide (CO2), biological oxygen demand (BOD), nitrate, ammonia, orthophosphate, salinity and observations of phytoplankton in water bodies. The water quality values at stations 1, 2, and 3 respectively for TSS, pH, DO, BOD, TOM, nitrate, ammonia, orthophosphate shows a less than optimal value. Water conditions based on plankton abundance 24,678 cells/mL, 44,904 cells/mL, 18,312 cells/mL were eutrophic. The average of water quality parameters classified as less than optimal. Relatively, station 1 is the station with the best conditions between stations 2 and 3.

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Experimental investigation of Gyroid recuperator performance integrated with internal combustion engine

Thermal Advances

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Thermal Advances 2024年 1卷

作者： Abdul Samad Wei-Hsiang Lai Zheng-Wei Zhang International Doctoral Degree Program on Energy Engineering National Cheng Kung University (NCKU) Tainan City Taiwan Department of Aeronautics and Astronautics National Cheng Kung University (NCKU) Tainan City Taiwan

The recuperator has the potential to enhance engine performance, reduce fuel consumption, and lower pollutant emissions, making it a promising technology for promoting environmental sustainability. This study investigates the impact of a Gyroid recuperator on the performance of a four-stroke internal combustion engine. Experimental analyses compared engine performance at various set points of rotational speeds before and after recuperator installation. The results validate the effectiveness of the Gyroid recuperator in recovering waste heat, thereby leading to improvements in fuel efficiency. The optimal performance, characterized by an 832.31 J/s increase in recovered combustion heat energy, was observed at 7000 RPM. Additionally, the Gyroid recuperator achieved a maximum overall heat transfer coefficient of 7.9215 W/m 2 K at 8000 RPM. The performance of the Gyroid recuperator was further analyzed using the log mean temperature difference method, which yielded a peak value of 114.4 °C at 7000 RPM. The effectiveness-number of transfer units’ method was also employed to assess its effectiveness. These results show that the recuperator can efficiently transmit and recover heat under certain working circumstances. The analysis suggests higher heat energy losses at lower speeds than high speeds, indicating a more efficient energy conversion process at higher engine speeds. The possibilities of the Gyroid recuperator to improve engine performance and its suitability for internal combustion engines are highlighted in this study. This technology offers a promising solution for improving vehicle efficiency and promoting environmental sustainability.

关键词： Gyroid Heat energy Recuperator Internal combustion engine Heat transfer coefficient

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Digital twin for subsea pipeline corrosion monitoring location based on ILI-MFL pipeline operator forum and potentiodynamic test

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AIP Conference Proceedings 2024年第1期3076卷

作者： Ekha Panji Syuryana Muhammad Agus Kariem I. G. N. Wiratmaja Puja M. Irvan Maulana Uriyana Rizki Agus Doctoral Study Program Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia Faculty of Industrial Technology Pertamina University Jakarta Indonesia Master Study Program Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia PT Dago Energi Nusantara Bandung Indonesia

The limitation of subsea pipeline access coupled with limited personnel mobilization due to the COVID-19 pandemic has become a challenge in pipeline inspections. With these limitations, this study’s Inspection Data Management System (IDMS) was carried out by processing data from In Line Inspection-Magnetic Flux Leakage (ILI-MFL) to be developed into digital twin data initiation by simulating anomalies that occur using a potentiodynamic test. The analysis was carried out using the Pipeline Operator Forum (POF) diagram to map the corrosion morphology of the pipeline. Sampling is carried out using pipeline material API 5L-X42 which will form a certain corrosion morphology that represents pinhole, pitting, and general corrosion which is adjusted to the anomalies feature and metal loss depth from pipe tally in the form of length, width, and depth percent of the anomaly to the nominal wall thickness. Potentiodynamic testing was carried out using corrtest instrument 5.0, resulting in tafel polarization to define Resistance of polarization using a stern geary approach. The results are then analyzed to determine the material in resisting damage which shows corrosion rate (for general) and pitting rate (for pitting and pinhole) which is <0.02 mmpy for outstanding, 0.02-0.1 mmpy for excellent, 0.1-0.5 mmpy for good and 0.5-1 mmpy for fair. This digital twin method combined ILI MFL and Potentiodynamic testing to result in the type of anomalies, metal loss depth, dimension of anomalies from the results of the POF diagram, and determination of corrosion rate and pitting rate of API 5L-X42 material in the subsea pipeline.

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Laser-MIG hybrid welding and porosity reduction on the aluminum alloy welds: A systematic review

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AIP Conference Proceedings 2023年第1期2706卷

作者： Saifudin Triyono Nurul Muhayat Eko Surojo Department of Automotive Engineering Universitas Muhammadiyah Magelang Magelang Indonesia Doctoral program in Department of Mechanical Engineering Universitas Sebelas Maret Surakarta Indonesia Department of Mechanical Engineering Universitas Sebelas Maret Surakarta Indonesia

The high melting point of aluminum oxide (Al2O3) increases the solubility of hydrogen in molten aluminum. However, its inability to completely remove hydrogen until the weld metal solidifies forms porosity. Therefore, this research uses a systematic literature review (SLR) method to identify the Laser-MIG hybrid welding capable of reducing the porosity of the aluminum alloy welds. This process is achieved by increasing the welding current and arc power while decreasing its speed. The result showed that the Laser-MIG hybrid has the ability to reduce the porosity of aluminum alloy joints to below 3% with an increase in ductility.

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Quantification the morphological structure of bio-based membrane by high resolution of SEM imaging

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AIP Conference Proceedings 2023年第1期2477卷

作者： Afrillia Fahrina Sri Aprilia Muhammad Roil Bilad Nasrul Arahman Maughal Ahmed Ali Baig Avala Raji Reddy Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh Indonesia Doctoral Program School of Engineering Post Graduate Program Universitas Syiah Kuala Banda Aceh Indonesia Faculty of Integrated Technologies Universiti Brunei Darussalam Brunei Darussalam Department of Mechanical Engineering CMR Technical Campus Hyderabad India

For the purpose of semi-permeable filtration system, membrane morphological structure determines the permeation quality. Membrane surface porosity, pore size distribution, symmetric and asymmetric structure in cross-section membrane play crucial role in transport properties. Therefore, scanning electron microscopy (SEM) plays important role to visualize the microscopical pore structure of membranes. In this study, bio-based composite membranes were prepared using non-solvent induced phase separation (NIPS) method. Polyvinylidene fluoride (PVDF) was employed as the main material, while ginger extract (GE) and SiO2 nanoparticles were used as additives. SEM image in this study provide information of membrane structure in surface and cross-section part. Furthermore, quantitative data of membranes in term of overall porosity is also presented. ImageJ tools is applied as software-aided SEM images processing method. The result analysis shows that addition of GE and SiO2 increase membrane porosity up to 70.81%.

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Piecewise affine modeling of parallel boost converter in a DC microgrid and its control application by utilizing a Linear Matrix Inequality approach

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e-Prime - Advances in Electrical engineering, Electronics and Energy 2024年 10卷

作者： Dwiono, Wakhyu Trilaksono, Bambang R. Rachmildha, Tri Desmana Rizqiawan, Arwindra Doctoral Program of Electrical Engineering and Informatics School of Electrical Engineering and Informatics Institut Teknologi Bandung Jl Ganesha 10 Jawa Barat Bandung 40132 Indonesia School of Electrical Engineering and Informatics Institut Teknologi Bandung Jl Ganesha 10 Jawa Barat Bandung 40132 Indonesia University Center of Excellence—Artificial Intelligence on Vision NLP and Big Data Analytics (U-CoE AI-VLB) Jl Ganesha 10 Jawa Barat Bandung 40132 Indonesia Department of Electrical Engineering Universitas Muhammadiyah Purwokerto Jl KH Ahmad Dahlan 1 Jawa Tengah Purwokerto 53182 Indonesia

The Piecewise Affine (PWA) model approximates nonlinear systems using linear models within specific regions. This approach offers advantages for designing DC microgrid control systems with linear controllers, mainly when the system includes several nonlinear DC–DC boost converters. The boundaries of the PWA model can be established using straightforward methods based on duty cycle partitions. Each duty-cycle region represents a distinct operational mode of the system characterized by unique dynamic equations. This study presents a formulation for deriving the PWA model of a parallel boost converter based on its nonlinear average dynamics resulting from the multiplication of states and inputs. An average dynamics model for the parallel boost converter is also introduced and employed in the deriving formulation. Moreover, computer simulations were conducted to analyze the PWA models of parallel boost converter dynamics, employing various partitions, comparing their behaviors among themselves and against those of the Matlab Simulink model. Furthermore, laboratory experiments were conducted by implementing a controller based on Linear Matrix Inequalities (LMI), designed using the PWA model of the parallel boost converter, to regulate the converter's output voltage. The simulation and experimental results demonstrate that the PWA models of parallel boost converter dynamics closely align with those of the average model, making it well-suited for being controlled using a linear controller. © 2024 The Authors

关键词： Average dynamics DC microgrid Modeling and simulation Parallel boost converter Piecewise affine

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The Optimization of Power Generation Mix to Achieve Net Zero Emission Pathway in Indonesia without Specific Time Target

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International Journal of Sustainable Energy Planning and Management 2024年 41卷 5-19页

作者： Fitriana, Ira Hadiyanto Warsito, Budi Hilmawan, Edi Santosa, Joko Doctoral Program of Environmental Sciences School of Postgraduate Studies Diponegoro University ImamBardjo Street Semarang Pleburan50241 Indonesia Puspiptek Street Serpong Banten South Tangerang City Indonesia Department of Chemical Engineering Diponegoro University Prof. Sudarto SH. Street Semarang Tembalang50275 Indonesia Department of Statistics Diponegoro University Prof. Sudarto SH. Street Semarang Tembalang50275 Indonesia Directorate for Technology Transfer and Audit System Deputy for Utilization of Research and Innovation BRINBuilding MH. Thamrin Street Jakarta10340 Indonesia

Indonesia is committed to achieving Net Zero Emission (NZE) conditions by the year 2060, with policy adjustments and constraints being necessary to realize this goal. The aim of this study is to achieve NZE conditions using a least-cost optimization method for various power plants that rely on fossil and non-renewable energy sources, without specifying a target year. Two scenarios, Business as Usual (BAU) and NZE, were developed for comparison in the optimization analysis. Through the utilization of LEAP and NEMO software, the optimization results suggest that optimal NZE conditions in Indonesia could be attained by 2075, with solar-based electricity generation playing a crucial role in meeting basic electricity demands. The NZE scenario predicts a 28% rise in electricity demand by 2100 compared to the BAU scenario. In 2075, PV will contribute 32.8% (224.3 GW) to total power supply, while BESS will provide 198.8 GW according to the NZE scenario. This study aims to assist the Indonesian government and stakeholders in reaching the NZE goal, while maintaining current efforts to avoid new efficiency and financial challenges. Achieving this goal will involve using a cost-effective optimization approach and implementing energy-efficient technologies and conservation programs. © 2024, Aalborg University Press. All rights reserved.

关键词： Renewable energy

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Green synthesis of polyvinylidene fluoride ultrafiltration membrane with upgraded hydrophilicity

Results in Materials

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Results in Materials 2023年 19卷

作者： Rizqi, Rachma Alfiana Hartono, Yubi Vebiona Shalahuddin, Iqbal Nugroho, Wahyunanto Agung Bilad, Muhammad Roil Arif, Chusnul Wibisono, Yusuf Department of Bioprocess Engineering Brawijaya University Malang 65145 Indonesia MILI Institute for Water Research Kawasan Industri Jababeka Cikarang Utara Bekasi 17530 Indonesia Doctoral Program of Department of Agricultural Industrial Technology IPB University Bogor Indonesia Faculty of Integrated Technologies Universiti Brunei Darussalam Jalan Tungku Link Gadong BE1410 Brunei Darussalam Department of Civil and Environmental Engineering IPB University Bogor Indonesia

The use of Cyrene™ as an alternative non-toxic solvent to produce a PVDF-based ultrafiltration membrane was investigated in this study. Polyethylene glycol (PEG) and polyvinylpyrrolidone (PVP) were used as organic additives to explore its ability to improve membrane hydrophilicity. The additives were introduced into the casting solution via phase inversion with a combined non-solvent induced phase separation (NIPS) and evaporation-induced phase separation (EIPS) technique. The prepared membranes were characterized to examine its morphology, mechanical properties, and filtration performance. The results show that the addition of PEG and PVP has proven able to improve the membrane hydrophilicity with the lowest contact angle of 76.81° achieved from the addition of PEG with concentration 3 wt%. However, the nascent membranes were not adequate enough, in terms of its mechanical properties, to undergo performance tests due to its very brittle nature. The overall results from this study demonstrate a great potential as a proposed method of utilizing Cyrene™ as a choice of green solvent to fabricate PVDF-based ultrafiltration membrane with the incorporation of PEG and PVP as organic additives. © 2023 The Authors

关键词： CyreneTM Membrane synthesis Polyethylene glycol Polyvinylidene fluoride Polyvinylpyrrolidone Ultrafiltration

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Evaluating the impacts of environmental and human health of the critical minerals mining and processing industries in Indonesia using life cycle assessment

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Wahyono, Yoyon Sasongko, Nugroho Adi Trench, Allan Anda, Martin Hadiyanto, Hadiyanto Aisyah, Nyayu Anisah, Anisah Ariyanto, Novy Kumalasari, Isnaeni Putri, Virny Zasyana Eka Lestari, Mutia Citrawati Panggabean, Lambas Parlaungan Ridlo, Rohmadi Sundari, Sundari Suryaningtyas, Anissa Dewi Novianti, Endah Dwi Hakim, Muhammad Raihan Farras Prihatin, Anggara Lomak Matin, Hashfi Hawali Abdul Research Center for Sustainable Production System and Life Cycle Assessment National Research and Innovation Agency - BRIN Prof. BJ. Habibie Complex Area Banten Tangerang Selatan 15314 Indonesia Energy Security Graduate Program Republic of Indonesia Defense University IPSC Sentul Area West Java 16810 Indonesia Centre for Exploration Targeting School of Earth Sciences The University of Western Australia 35 Stirling Highway Crawley 6009 WA Australia UWA Business School 35 Stirling Highway Crawley 6009 WA Australia Environmental Engineering Murdoch University Murdoch 6150 WA Australia Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Central Java Semarang 50241 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Central Java Semarang 50275 Indonesia Department of Mechanical Engineering Vocational School Gadjah Mada University Sleman Yogyakarya 55281 Indonesia Study Program of Environmental Science Faculty of Mathematics and Natural Science Universitas Sebelas Maret Central Java Surakarta 57126 Indonesia

The critical minerals industries in Indonesia may pose possible environmental and human health risks due to the release of pollutants into soil, water, and air, as well as the use of materials and energy. This study investigates the possible environmental and human health impacts of Indonesia's nickel, gold, copper, tin, and bauxite mining and processing industries. This study utilizes the latest version of the OpenLCA software, version 2.0, in combination with the Ecoinvent 3.8 database. To evaluate potential environmental consequences and health effects on humans, CML-IA Baseline and Environmental Priority Strategies (EPS) are employed in product development. The EPS system was developed utilizing a hierarchical methodology with the objective of furnishing the product developer with data regarding the financial impact of human health impairment resulting from a particular product development. The production of one tonne of gold, nickel, bauxite, tin, and copper results in the emission of 7.34.E+07, 4.61.E+04, 3.10.E+04, 1.02.E+04, 8.01.E+03 kg CO₂ eq/t, respectively, contributing to global warming. This production is associated with asthma cases of 7.79.E+01 (gold industry), 2.21.E−03 (copper industry), 1.81.E−03 (tin industry), 9.21.E−04 (nickel industry), and 4.71.E−06 (bauxite industry) Personyears/t. Electricity consumption and the release of carbon dioxide are the main factors contributing to global warming. The primary cause of asthma cases is the utilization of fuel oil and electricity. Power plant chimneys can employ various technologies, such as cyclones, bag filters, and scrubbers, to mitigate the release of polluting gas emissions. The critical mineral industry must prioritize handling and governing of steam power facilities to minimize their negative effects on the environment and human health. © 2024 The Authors

关键词： Critical minerals industries Environmental impacts Human health impacts Life cycle assessment

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Reducing dropout rate through a deep learning model for sustainable education: long-term tracking of learning outcomes of an undergraduate cohort from 2018 to 2021

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Smart Learning Environments 2023年第1期10卷 1-16页

作者： Shiao, Yi-Tzone Chen, Cheng-Huan Wu, Ke-Fei Chen, Bae-Ling Chou, Yu-Hui Wu, Trong-Neng Center of Institutional Research and Development Asia University Taichung City Taiwan ROC Department of Education National Taichung University of Education Taichung City Taiwan ROC Department of M-Commerce and Multimedia Applications Asia University Taichung City Taiwan ROC Department of Business Management National Taichung University of Science and Technology Taichung City Taiwan ROC Doctoral Program of Intelligent Engineering National Taichung University of Science and Technology Taichung City Taiwan ROC Department of Healthcare Administration Asia University Taichung City Taiwan ROC

In recent years, initiatives and the resulting application of precision education have been applied with increasing frequency in Taiwan; the accompanying discourse has focused on identifying potential applications for artificial intelligence and how to use learning analytics to improve teaching quality and learning outcomes. This study used the established dropout risk prediction model to improve student learning effectiveness. The model was based on the academic portfolios of past students and built with statistical learning and deep learning methods. This study used this model to predict the dropout risk of 2205 freshmen enrolled in the fall semester of 2018 (graduated in June 2022) in the field of sustainable education. A total of 176 students with a dropout risk of more than 20% were considered high-risk students. After tracking and the appropriate guidance, the dropout risk of 91 students fell from > 20% to < 20%. To discuss the results from the perspective of gender and financial disadvantages, the improvement rate of the dropout risk for male students was 10.2% better than that of female students at 2.9%. The improvement rate in dropout risk for students with disadvantageous financial situations was as high as 12.0%, surpassing the 5.9% rate among general students. Overall, the dropout rate in the second year of the 2018 freshman cohort was lower than that of the 2016 and 2017 freshman cohorts. A predictive model established by statistical learning and deep learning methods was used as a tool to promote precision education, accurately and efficiently identifying students who are having difficulty learning, as well as leading to a better understanding of AI (artificial intelligence) in smart learning for sustainable education.

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