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Performance of solar panels as electricity source to burn rice powder in the biomass gasification process

AIP Conference Proceedings 2023年第1期2828卷

作者： Suliono Dedi Suwandi Muhammad Luthfi Felix Dionisius Dori Yuvenda Mechanical Engineering Study Program Indramayu State Polytechnic. Legok Indramayu District West Java 4525 Indonesia Department of Automotive Engineering Faculty of engineering Universitas Negeri Padang. Campus UNP Air Tawar West Padang 25171 Indonesia

Currently, energy needs are one of the sources of human life that cannot be separated. Energy can be classified into two, energy sourced from fossils of living things and plants, with high rice production, making gasification tools an alternative to the use of rice husks into energy. Gasification is a thermochemical process of converting solid fuels into gas thus gasification using this resource is itself a renewable energy. This research is experimental. The air flow rate valve is set at speed = 2.2 m/s for the glowplug variation 3, 2.5m/s for the glowplug variation 4, 2.6m/s for the glowplug variation 5, 2.9 m/s for the glowplug variation 6 with Air Fuel Ratio (AFR)) 0.7%, 0.8%, 0.9%, 1%. With the glowplug variation, the highest temperature is up to 888°C with 1% AFR.

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Fast fashion technology and products: Student perceptions of Universitas Negeri Yogyakarta

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AIP Conference Proceedings 2023年第1期2590卷

作者： Resi Sepsilia Elvera Moh. Adam Jerusalem Laila Nurul Himmah Chytra Mahanani Fashion Design Study Program Faculty of Engineering Universitas Negeri Yogyakarta Jalan Karang Gayam Caturtunggal Depok Sleman Regency Special Region of Yogyakarta 5528 Indonesia

The rapid advancement of information technology requires us to always keep abreast of the times in the current global era, the ease of information from various technologies, especially internet technology in internet access services so that it directly facilitates information about fast fashion products that provide many advantages and convenience in following the latest fashion trends. especially youth fashion among students as part of self-existentialization efforts, thus making them behave consumptively. The aims of this study are (1) to find out the latest technology in fast fashion (2) to find out what factors influence students' consumption behavior towards fast fashion. In this study, the population was UNY students, with a sample size of 382 students who were taken randomly. This type of research is descriptive with a quantitative approach. This research took place from February 2021 - June 2021. The measuring instrument used was a questionnaire in the form of a questionnaire with statements consisting of fast fashion consumption behavior. Questionnaires were distributed to respondents online. The results of the study show that (1) internet technology through social media significantly influences buying decisions for fast fashion products. (2) consumer behavior based on the theory of planned behavior in terms of Attitude Toward Behavior, Subjective Norm, Perceived behavior control on average, female undergraduate students of the faculty of engineering, who are between the ages of 20 have a higher tendency to consume fast fashion products. The measuring instrument used was a questionnaire in the form of a questionnaire with statements consisting of fast fashion consumption behavior. Questionnaires were distributed to respondents online. The results of the study show that (1) internet technology through social media significantly influences buying decisions for fast fashion products. (2) consumer behavior based on the theory of planned behavior in terms of Att

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Experimental study on the effectiveness of finger joint with variations in wood species toward bending strength of glulam beams 7

Experimental study on the effectiveness of finger joint with...

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7th International Conference on Sustainable Future for Human Security in conjunction with 3rd International Conference on Green Development in Tropical Regions, ICGDTR 2018

作者： Anshari, B. Rofaida, A. Mahmud, F. Pathurahman Rahmalia, R. Master Program of Civil Engineering Faculty of Engineering Mataram University Jl Majapahit 62 Mataram NTB Indonesia Department of Civil Engineering Faculty of Engineering Mataram University Jl Majapahit 62 Mataram NTB Indonesia Department of Civil Engineering Faculty of Engin Mataram University Jl Majapahit 62 Mataram NTB Indonesia

Recently, the utilization of timber as building materials was very promising for now and future. As renewable resources they have high mechanical properties, lightweight, environmentally friendly and economic. One of the most durable engineered wood products is glued-laminated timber which commonly called Glulam. Glulam is a material made of several layers of wood glued together with waterproof adhesive at specific pressure and temperature. The benefit of Glulam is enable to produce the structural member with longer span compared with solid wood. In other to obtain the structural Glulam with longer span, it required the finger joint connection on lamina layer. This study aims at to find out the effectiveness finger joint with variation in wood species towards flexural properties of Glulam beam. Experimental study have been done by using local wood Sengon and Rajumas as laminae and Biomatex as adhesive, at 0.6 MPa of clamp pressure. The variation of finger joint slope was tested are 1:8;1:12;and 1:16. The result show that the glulam Sengon and Rajumas beam with slope finger joint of 1 over 12 produce the highest average bending strength of 299 kg/cm2 and 318 kg/cm2 respectively. The flexural strength of glulam Rajumas was 20% higher compared with glulam Sengon. © Published under licence by IOP Publishing Ltd.

关键词： Bending strength

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Bridging the gap in nutrient management: Transitioning from conventional to sustainable slow-release fertilizers in modern agriculture

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Journal of Cleaner Production 2025年 513卷

作者： Said, Nor Sakinah Mohd Kurniawan, Setyo Budi Daud, Nurull Muna Sharuddin, Siti Shilatul Najwa Barakwan, Rizkiy Amaliyah Luthfi, Abdullah Amru Indera Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Selangor Bangi43600 Malaysia Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Selangor Bangi43600 Malaysia Jakarta Pusat10340 Indonesia Environmental Engineering Study Program Department of Biology Faculty of Science and Technology Universitas Airlangga Kampus MERR C Dr. Ir. H. Soekarno Street Mulyorejo East Java Surabaya60115 Indonesia

The world's continuous demographic expansion has driven a growing demand for a stable food supply, making the agriculture sector a key foundation for sustainable food production. However, the widespread use of conventional fertilizers has resulted in significant environmental and economic drawbacks, including inefficient nutrient delivery and nutrient leaching. These challenges highlight the urgent need for innovative agricultural solutions. This article reviews the adverse impacts of conventional fertilizer use on ecosystems and discusses the transition to slow-release fertilizers (SRF) as a promising alternative. SRF offers more controlled nutrient release, reducing nutrient loss and improving efficiency compared to traditional fertilizers. The article examines different types of SRF, their mechanisms, advantages, limitations, and their potential to transform modern agriculture by addressing both environmental concerns and crop nutrient management. Key challenges, including high production costs and the use of non-biodegradable coatings, are addressed. This review highlights the potential of bio-based coatings as replacements for non-renewable petroleum-based materials in SRFs, promoting sustainable practices and reducing potential toxicity in agricultural applications. The evolution of SRFs into multifunctional fertilizers is also discussed, emphasizing their expanding roles beyond controlled nutrient release. © 2025 Elsevier Ltd

关键词： Crops

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Magnetic mineral concentration and microcrystalline characteristics of Fe-rich coastal sand from North Sulawesi

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AIP Conference Proceedings 2023年第1期2694卷

作者： Gerald Tamuntuan Ping A. Angmalisang Adey Tanauma Seni H. Tongkukut Hanny F. Sangian Agnes T. Mandagi Silvia J. Fajar Dolfie P. Pandara Guntur Pasau Ferdy Ferdy As’ari As’ari Department of Physics Sam Ratulangi University Manado 95115 Indonesia Marine Science Study Program Sam Ratulangi University Manado 95115 Indonesia Department of Civil Engineering Sam Ratulangi University Manado 95115 Indonesia Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

Magnetic mineral concentration, especially from the iron oxide class, is one of the important indicators in determining the potential iron sand natural resources. In this study, the magnetic measurement as well as X-ray spectroscopy analysis have been carried out in order to determine the concentration and microcrystalline characteristics of iron sand originating from four locations in the coastal area of North Sulawesi which are Lolan, Lalow, Hais, and Minanga. Magnetic properties study through measurement of saturation isothermal remanent magnetization (SIRM) confirmed by oxide composition obtained from X-ray fluorescence (XRF) observation showed that the iron sand sample from Lolan had the highest concentration of iron oxide minerals followed by samples from Hais, Lalow, and Minanga respectively. The percentage of iron oxide at these sites varied between 60.33 – 76.70 wt.%, implying that it was relatively competitive compared to the samples from other localities in Indonesia. Findings related to variations in crystal size and degree of crystallinity are closely related to the source and mechanism of iron sand formation at each study site.

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The implementation of teaching factory in producing fly ash based eco-friendly concrete products 2

The implementation of teaching factory in producing fly ash ...

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2nd International Conference on Technology and Vocational Teachers, ICTVT 2018

作者： Inderawan, N.A. Widodo, S. Pascasarjana Yogyakarta State University Caturtunggal Depok Sleman Yogyakarta55281 Indonesia Study Program of Civil Engineering and Planning Education Faculty of Engineering Yogyakarta State University Caturtunggal Depok Sleman55281 Indonesia

This literature study aimed to describe eco-friendly solutions for developing teaching factory models in vocational high schools by using Fly Ash wastes as cemet replacement materials. The need for eco-friendly concrete has become an innovation which is able to reduce the impacts of environmental pollutions and the concrete product has better quality than conventional concrete. Vocational High Schools in Indonesia have good potential to apply this idea by using teaching factory model for producing eco-friendly concrete because of multiple benefits: (1) reducing the amounts of fly ash wastes;(2) the result of this model is a good quality concrete product that gives benefit to society;(3) providing the understanding of Greening TVET to vocational high students;(4) students deepen their competencies by adapting Greening TVET;(5) also growing good cooperation between steam electricity power plant, vocational school, industry in the field of eco-friendly concrete, and market needs. This study reviewed the various studies about the characteristics and optimum mix design of fly ash as material mixture and teaching factory model. The result of study are idea and design of teaching factory model in Vocational High School by using fly ash as cement replacement of concrete mix design. © Published under licence by IOP Publishing Ltd.

关键词： Fly ash

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Analysis of tsunami hazard in the Southern Coast of West Java Province - Indonesia 2

Analysis of tsunami hazard in the Southern Coast of West Jav...

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2nd Maritime Science and Advanced Technology: Marine Science and Technology in Framework of The Sustainable Development Goals, MSAT 2019

作者： Windupranata, W. Hanifa, N.R. Nusantara, C.A.D.S. Aristawati, G. Arifianto, M.R. Research Group of Coastal Ocean and Maritime Engineering Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia Centre for Earthquake Science and Technology Research Centre for Disaster Mitigation Institut Teknologi Bandung Indonesia Research Laboratory of Hydrography Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia Study Program of Geodesy and Geomatics Engineering Faculty of Earth Sciences and Technology Institut Teknologi Bandung Indonesia

The Southern Coast of West Java Province in the Java Islands is one of prone and exposed area to tsunami hazard. It has about 428 kilometers coastline length, covering 5 administrational regencies (i.e. Sukabumi, Cianjur, Garut, Tasikmalaya, and Pangandaran). It is a strategic area that support many economic activities including tourism, fisheries, electricity power plants, agricultures, markets as well as social factors such as coastal villages, schools and other public facilities. The existence of this strategic area is threatened by the potential for a tsunami disaster mainly from megathrust along the Southern Coast of Java Island. On 2006, a tsunami earthquake of M7.7 occurred off Pangandaran Regency with tsunami height of 5-8 meters and inundated about 500 meters along southern coast of West and Central Java Province. The tsunami caused more than 600 casualties and damage to buildings, public facilities and insfrastructure. Yet, the Indonesia National Earthquake Source and Hazard Map suggest a bigger threat of a plausible M8.7 - M9.2 megathrust earthquake off Java island. This research aims to analyze and map potential areas affected by the tsunami in the South Coast of West Java Province based on numerical modelling carried out with Cornell Multi-grid Coupled Tsunami Model (COMCOT) v1.7 based on the several megathrust earthquake scenarios in southern off West Java. The results of tsunami modelling show that the highest impact is generated in the Sunda Straits & West Java - Central Java Megathrust Scenarios with highest tsunami inundation and the fastest travel time occurred in Cianjur Regency with 26,7 meters height and estimated arrival time of tsunami wave approximately 10 minutes after the mainshock, while the farthest inundation distance is estimated in Sukabumi Regency about 5.8 kilometers from the coast due to existence of river. © Published under licence by IOP Publishing Ltd.

关键词： Hazards

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Stress analysis of flying V-like non-conventional aircraft structures using finite element method

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AIP Conference Proceedings 2023年第1期2941卷

作者： Julius I. Permana Annisa Jusuf Bambang K. Hadi Arief Yudhanto Aerospace Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung (ITB) Ganesha 10 Bandung 40132 Indonesia Lightweight Structures Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung (ITB) Ganesha 10 Bandung 40132 Indonesia Mechanics of Composites for Energy and Mobility Laboratory Mechanical Engineering Program Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

The stresses that occurred on the structures of a flying wing aircraft exemplified by the Flying-V structures (inspired by the design of Dr. Justus Benad of TU Delft) were evaluated using the finite element method to ensure a safe cruise condition. Two materials, i.e., aluminum alloy and carbon/epoxy composites, were defined in the analysis of the conceptual sub-structures (frame, longeron-stringer, spar-fuselage, ribs, spar wing, and upper and lower skin). These conceptual sub-structures do not necessarily represent the actual design of the Flying-V, although they may be adopted as the initial step. Structural optimization was performed with two objectives: (i) to minimize the sub-structural thickness of fully aluminum aircraft and (ii) to minimize the sub-structural thickness and laminate stacking sequence of fully composite aircraft. To this end, the stresses and wing-tip deflection were minimized. The analysis showed that carbon/epoxy composite is a feasible material to minimize the wing-tip deflection and weight compared to the aluminum alloy. The minimization of wing-tip deflection and weight was possible using a composite lay-up of quasi-isotropic, either (0/45/-45/90)s or (0/45/90/-45)s. Here, the finite element analysis provides a path to further the structural optimization of the non-conventional flying wing aircraft.

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Seasonal influence on pollution index and risk of multiple compositions of microplastics in an urban river

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Science of the Total Environment 2023年第PT 1期859卷 160021页

作者： Huang, Chi-Wei Li, Yi-Lin Lin, Chitsan Bui, Xuan-Thanh Vo, Thi-Dieu-Hien Ngo, Huu Hao Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan Ph.D. Program in Maritime Science and Technology College of Maritime National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City Viet Nam Linh Trung ward Ho Chi Minh City700000 Viet Nam Faculty of Environmental and Food Engineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam School of Civil and Environmental Engineering University of Technology Sydney SydneyNWS2007 Australia

Emerging contaminant microplastics (MPs) are getting worldwide attention for their ubiquitous occurrence and potential risk to the environment. However, the seasonal influence on freshwater MP pollution remains poorly understood. To better understand and evaluate the riverine MPs in different seasons, this study conducted the risk assessment of MPs in an urban river, Houjin River, during the different seasons. The present study found that the MPs (0.1–5 mm, mostly 0.1–2 mm) were more abundant in the dry season (183.33 ± 128.95 items/m3) compared with the wet season (102.08 ± 45.80 items/m3). Similarly, the mixture of different MPs polymers was more diverse in the dry season. The related pollution indices such as the contamination factor (CF) and pollution load index (PLI) showed that average CF and PLI were 5.15 and 2.10 in the dry season, which significantly decreased to 1.58 and 1.25, respectively, in the wet season (p © 2022 Elsevier B.V.

关键词： Risk assessment

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Time integration analysis of Soekarno-Hatta International Airport (SHIA) Train with Skytrain 1

Time integration analysis of Soekarno-Hatta International Ai...

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1st International Conference on Smart City Innovation, ICSCI 2018

作者： Viarsyah, D. Sumabrata, J. Civil Engineering Program Department of Civil Engineering Faculty of Engineering Universitas Indonesia Jl. Margonda Raya Pondok Cina Beji Kota Depok Jawa Barat16424 Indonesia

The sustainability of transportation systems in Jakarta is under threat from climate change. Better integration and planning of public transportation is an alternative to support land transportation and to solve the congestion problem when heading to Soekarno-Hatta International Airport. Hence, PT Railink, PT Angkasa Pura II, PT Kereta Api Indonesia with its BUMN synergy built rail-based transportation called Airport Train. Moreover, Airport Train is connected with Skytrain in an integrated building as a transferring point. This study analyzes the time integration to travel using the Airport Train from BNI City Station to the Skytrain to reach the passenger destination terminal by observing additional time factors in the integration building or vice versa on the Skytrain - Airport Train trips. The results of the analysis in the form of Train Travel Charts show both on Airport Train - Skytrain trip and Skytrain - Airport Train trip after paying attention to integration factors, there are several schedule conditions that require passengers to depart for the next Airport Train or Skytrain, and worse not accommodate each other at certain times. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Airports

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