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The impact of land-use change on Cengklik Reservoir's sedimentation rate

Journal of Physics: Conference Series 2021年第1期1858卷

作者： Purwanti Sri Pudyastuti Annisa Fathi Yakan Jaji Abdurrosyid Hermono S Budinetro Civil Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Surakarta Jl. A. Yani Tromol Pos I Pabelan Kartasura Surakarta Indonesia 57102

The Cengklik Reservoir is operated for irrigation of rice fields in 3 sub-districts in Boyolali Regency, namely Sambi, Ngemplak, and Nogosari. At the present time, the volume of the Cengklik Reservoir has decreased and resulted in dryness during the dry season. One of the main causes is due to the high sedimentation rate. This research was conducted to evaluate changes in land use that resulted in sedimentation in the Cengklik Reservoir. Erosion prediction in this study uses USLE (Universal Soil Loss Equation) analysis. The amount of sediment obtained uses the standard erosion data from USLE calculations, namely by multiplying the amount of erosion by the SDR and the area of River Basin. The potential for erosion and sedimentation used land use data for 10 years, from 2009 to 2019. Based on the research, the amount of erosion and sedimentation in the Cengklik Reservoir was fluctuated with the highest amount occurring in 2016, with erosion of 9,292 tones/ha/year and sedimentation of 4304,154 tons/year. In general, erosion and sedimentation have increased from 2009 to 2019. The classification of erosion in the Cengklik Reservoir according to this study was categorized as light erosion. The trap efficiency used in this study was calculated using formulae based on the research of Heinemann (1981) using the Brune method for small reservoirs with an area of less than 0.5 km2. In general, based on this study, the Trap Efficiency in Cengklik Reservoir was 95.254%.

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Redesigning Tourism Management Using Hypothetical Scenario Valuation Based on Circular Economy Design Framework

Circular Economy and Sustainability

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Circular Economy and Sustainability 2025年 1-27页

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

This study investigates visitor preferences and willingness to pay (WTP) for circular economy attributes in Bali’s tourism sector, segmenting tourists into three groups: 3R champions, circular supporters, and traditionalists. It focuses on four core circular economy design principles: design for longevity, design for service, design for reuse in manufacturing, and design for material recovery. The results reveal strong visitor preferences for sustainable tourism practices that reduce waste, support local artisans, and lower carbon emissions. To operationalize these principles, four hypothetical tourism scenarios were developed: (1) local transitioning support, highlighting the use of locally sourced materials and recycled crafts;(2) eco-friendly adoptive package, prioritizing carbon footprint reduction through integrated services and advanced recycling systems;(3) renewable-by-design experience, featuring accommodations with reused art and recyclable materials;and (4) circular tourism development, which integrates all circular economy attributes. These findings offer strategic insights for designing a more sustainable and resilient tourism model in Bali. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Circular economy Design for longevity Design for material recovery Design for reuse in manufacture Design for service Sustainable tourism

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Handwriting prediction using the support vector machine method in web-based applications

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AIP Conference Proceedings 2022年第1期2659卷

作者： Syaifudin Dian Pratiwi Trubus Rahardiansyah Anasthesia Karunia Charles Hafiz Wijaya Khoirun Nisa 1Information System Study Program Faculty of Industrial Technology Universitas Trisakti Jakarta Indonesia 2Informatic Engineering Study Program Faculty of Industrial Technology Universitas Trisakti Jakarta Indonesia 3Department of Law Universitas Trisakti Jakarta Indonesia

Current technological advances have progressively encouraged individuals to use web-based applications. To determine the owner of a handwriting, one of the manual methods is generally done by people. And it can be done by a web application to find out the person’s handwriting. The Support Vector Machine (SVM) Method is a strategy of artificial intelligence used to recognize handwriting. This study intends to create a handwriting recognition framework using the Support Vector Machine (SVM) Method on a web-based application, with extraction features that are important as the basis for describing and characterizing handwritten images. The results obtained from predictions using the Support Vector Machine are by using 16 data and there are 80 tests carried out in total. The results obtained indicate that there are 25 incorrect prediction tests and 55 correct prediction tests so that the level of accuracy obtained is 68.75%.

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study Sedimentation Rate of PLTU Pulang Pisau Due to Jetty Modification in Efforts to Improve Production Capacity

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IOP Conference Series: Earth and Environmental Science 2022年第1期972卷

作者： Abiyani Choirul Huda Muhammad Ilham Maulana Widi A Pratikto Suntoyo Muhammad Khaisar Wirawani S Michael Parulian Ocean Engineering Study Program Institut Teknologi Kalimantan Kalimantan Timur 76127 Indonesia Ocean Engineering Departement Faculty of Marine Technologi. Institut Teknologi Sepuluh Nopember Surabya 60111 Indonesia

Pulang Pisau Steam Power Plant (PLTU) is one of the plants that is used to fulfill the electricity needs of the people in Central Kalimantan Province. By using coal as a source of steam production, the Pulang Pisau PLTU has a capacity of up to 2 × 60 MW. Such a large population growth cannot be avoided and it is therefore denied that the Pulang Pisau PLTU is deemed to require additional production capacity. One alternative that can be given is to increase the amount of fuel capacity, namely coal that can be accommodated. By changing the design of the existing jetty, it is expected that ships with larger capacities can lean on the Pulang Pisau power plant pond. In this study, an analysis of sediment volume rate in the existing condition jetty and two alternative jetties in the PLTU river basin area, where the modeling is done using MIKE21. The results of the existing jetty modeling show the sedimentation volume that was line up for 12 months at 9550.017 m3, while the sedimentation volume of alternative jetty 1 and 2 produced for 12 months respectively were 917.444 m3 dan 8616.040 m3. The first alternative jetty is more efficient in dealing with sediment in terms of increasing production capacity. The alternative jetty is considered to be able to maintain the determined vessel draft and not cause excessive sedimentation impacts in the Pulang Pisau power plant area.

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The cellular voice traffic profiling spatial urban land use for South Jakarta

The cellular voice traffic profiling spatial urban land use ...

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Life and Environmental Sciences Academics Forum 2018, LEAF 2018

作者： Taki, H.M. Djaja, B.M. Nurlambang, T. Lubis, M.Z. Koestoer, R.H. Department of Urban and Regional Planning Faculty of Environmental Design King Abdulaziz University Jeddah Saudi Arabia Department of Archaeology Faculty of Humanities Universitas Indonesia Depok16424 Indonesia Universitas Indonesia Depok16424 Indonesia Department of Geomatics Engineering Batam State Polytechnic Batam29461 Indonesia Study Program of Enviromental Sciences Universitas Indonesia 10430 Indonesia

Cellular traffic in the literature can be classified into voice, SMS, and data. Along with the rapid development of internet technology, a cellular operator is required to have spatial-based customer behavior information as the primary data in making business policy. The use of cell phone in Jakarta is remarkably recorded, while competitors among cell phone providers unavoidably follow the costumers' behaviors. Combined methods are applied such as statistical analysis of ANOVA and multiple comparison tests supplemented by the spatial techniques using Geographic Information System (GIS) to review the time and area differences of the voice traffic changes. A cellular provider name Indosat is chosen as a case of voice traffic model data. Simple land-use types of residential classifications are set up and isolated rings of Von Thunen are reconstructed to explain more on the relationship between voice traffic of cell phone and land use distribution. The result of research indicates that the voice traffic highly varies among residential strata and commercial areas. In addition, voice traffics vary between weekdays and weekends depending on the accumulated users. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Land use

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Tools and Strategy for Distance Learning to Respond COVID-19 Pandemic in Indonesia

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Ingenierie des Systemes d'Information 2020年第3期25卷 383-390页

作者： Utomo, Muhammad Nur Yasir Sudaryanto, Memet Saddhono, Kundharu Computer and Network Engineering Study Program Department of Electrical Engineering Politeknik Negeri Ujung Pandang Makassar90245 Indonesia Faculty of Teacher and Training Graduate School of Javanese Language and Literature Universitas Sebelas Maret Surakarta57126 Indonesia

Distance learning is a learning process that allows students and instructors are in different physical locations. During the COVID-19 pandemic, various countries including Indonesia chose the distance learning option to avoid the spread of the pandemic. However, the implementation of distance learning is not without problems. In Indonesia, the problems to implement distance learning are enormous both in terms of equitable distribution of infrastructure and costs for accessing the internet. To overcome these problems, research about best distance learning tools and its implementation strategy is really needed. Therefore, this research aimed to analyze the strategies and tools for implementing distance learning that reliable and cost-effective for the student at the same time. Based on research that has been conducted by analyzing questionnaire surveys of 256 students in Indonesia, this research recommends tools combination strategy consists of Google Classroom tool as a learning app, Whatsapp group as broadcast messaging and Zoom as a video conference media for distance learning. This research also recommended to maximize the e-learning/learning app features for theoretical lessons and consider video conference just in practical lessons so that the distance learning costs become cheaper for students. © 2020 International Information and engineering Technology Association. All rights reserved.

关键词： Students

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Degradation mechanisms and stability challenges in perovskite solar cells: a comprehensive review

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Solar Energy 2025年 299卷

作者： Swellam W. Sharshir Ahmed A. El-Naggar Hamdy A. Ismail Menna M. Sami Lotfy A. Lotfy Mosaad R. Sharaby Huizhong Zhao Sung-Hwan Jang Amena Ali Alsakran N. S. Abd EL-Gawaad M. Ismail Eman Abdelnasser Abdelhamid El-Shaer Maher Rashad Mechanical Engineering Department Faculty of Engineering Kafrelsheikh University Kafrelsheikh 33516 Egypt Physics Department Faculty of Science Kafrelsheikh University Kafrelsheikh 33516 Egypt Nano Science and Technology Program Faculty of Science Kafrelsheikh University Kafrelsheikh 33516 Egypt Merchant Marine College Shanghai Maritime University Shanghai 201306 China Department of Civil & Environmental Engineering School of Engineering Hanyang University ERICA Ansan Gyeonggi-do 15588 South Korea Department of Biology College of Science and Humanities in Al-Kharj Prince Sattam Bin Abdulaziz University Al-Kharj 11942 Saudi Arabia Health Specialties Basic Sciences and Applications Unit Applied College King Khalid University Muhayil Asir Abha 62529 Saudi Arabia Mechanical Engineering Department Faculty of Engineering Suez University Egypt Chemistry Department Faculty of Science Kafrelsheikh University El-Geish Street P.O. Box 33516 Kafrelsheikh Egypt Production Engineering and Mechanical Design Department Faculty of Engineering Tanta University Egypt

Perovskite solar cells (PSCs) present a promising alternative to silicon-based solar cells, offering high efficiency, cost-effective production, and flexibility. Despite their potential, challenges such as stability concerns, toxicity, and scaling limitations hinder their widespread commercial adoption. Ongoing research is focused on advancing material innovations and exploring tandem cell configurations to improve both durability and efficiency, aiming to overcome these barriers for broader deployment. Despite these superior properties there is no perfection in every aspect; the perovskite materials suffer from rapid degradation under operational conditions, so this review explores key degradation processes impeding the PSCs long-term stability, including the extrinsic factors which involve exposure to high temperature, humidity, light and intrinsic factors like ion migration, residual strain, and charge trapping. The main outcome of this review is the severe impact of defect density and environmental factors on PSC efficiency and stability. Increased defect density (from 1 × 10 12 to 1 × 10 16 cm −3 ) significantly reduces PSC efficiency, dropping PCE efficiency from 21.69 % to 8 % due to shortened diffusion length (10 to 0.1 µm) and carrier lifetime (20 to 0.002 µs). Additionally, the controlled humidity during fabrication enhances PCE efficiency to 20.19 %, while high humidity yields lower PCE (12.39 %), indicating the importance of defect and environmental management for optimal PSC performance.

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The implementation of SNI 8518:2018 and SNI 8519:2018 in the primary school of Jabodetabek area: A preliminary results

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AIP Conference Proceedings 2022年第1期2664卷

作者： Yanto Yanto Wibawa Prasetya Joshua Utoyo Gregorius S. Kenzie 1Industrial Engineering Study Program Faculty of Engineering Atma Jaya Catholic University of Indonesia Jalan Raya Cisauk-Lapan No. 10 Sampora Cisauk Tangerang Banten 15345 INDONESIA

The aim of this research is to evaluate the implementation of a new national standard SNI 8518:2018 for chair and SNI 8519:2018 desk by the school authorities in the metropolitan area of Jakarta. Several 190 type sizes of the predetermined desk and chair dimensions from 114 primary schools were measured and evaluated according to the dimensions in the new national standard SNI 8518:2018 and SNI 8519:2018. There are 5 dimensions that were evaluated: the height, width, depth, and backrest height (for chair), and desk height. To evaluate the dimensions of the chair in SNI 8518:2018 and desk in SNI 8519:2018, each evaluated dimension was compared to identify the compatibility or incompatibility among them. Results showed that most dimensions of the chair provided by school authorities did not comply with the dimensions issued in the SNI 8518.2018 with a percentage of 93.7%. Similarly, desk height provided by school authorities also did not comply with SNI 8519.2018 with a percentage of 81.1%. This study showed that most dimensions of classroom furniture in the primary schools under study did not follow the dimensions issued in the national standard SNI 8519:2018 for desk and SNI 8518:2018 for chair.

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How to promote circular economy in the global South: The circular technical network framework and the case of Colombia

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Resources, Conservation and Recycling 2025年 222卷

作者： Ana Julieth Calderón Márquez Nathalia Silva de Souza Lima Cano Emília Wanda Rutkowski André Felipe Simões Beatrice Smyth Energy Systems Planning Program Faculty of Mechanical Engineering University of Campinas UNICAMP SP Brazil Mechanical and Mechatronic Engineering Research Group (GIMEC) University of Santo Tomas Villavicencio Colombia FLUXUS Laboratory on Urban and Socio-Environmental Sustainability Teach Learning Department of Sanitation and Environment Studies School of Civil Engineering Architecture and Urban Studies University of Campinas UNICAMP SP Brazil Department of Civil and Environmental Engineering Swanson School of Engineering University of Pittsburgh Pittsburgh PA USA School of Arts Sciences and Humanities University of São Paulo São Paulo Brazil School of Mechanical and Aerospace Engineering Queen's University Belfast Belfast UK

The circular economy (CE) promotes sustainability by minimizing resource consumption and encouraging reuse, recycling, and recovery. Although Global North has advanced CE policies, Global South continues to face persistent challenges, including weak waste management systems and social inequality. This article creates and tests the "Circular Technical Network" (CTN) framework, designed to analyze policy content, institutional arrangements, and stakeholder roles in CE transitions. Using Colombia as a case study, the CTN framework identifies four critical success factors for an effective CE transition: overcoming fragmented governance and coordination challenges, clearly defining roles within recycling systems, integrating organic waste into Extended Producer Responsibility (EPR) regulations, and advancing the adoption of the 10Rs hierarchy. Based on these findings, strategic policy recommendations are organized across five interconnected dimensions: governance, legal/regulatory, financial and economic instruments, monitoring and information systems, and infrastructure. Together, the CTN framework and these recommendations provide policymakers and institutions in Global South countries with a structured tool for reshaping public policy and institutional design, facilitating a more sustainable CE transition.

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Mining sector in the economic structure of South Kalimantan Province: direct and indirect impacts

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IOP Conference Series: Earth and Environmental Science 2021年第1期882卷

作者： K S Putri Riswan I Rahman Mining Engineering Study Program Faculty of Engineering Universitas Lambung Mangkurat Banjarbaru 70714 South Kalimantan Indonesia

Supporting sectors for sustainable economic development in a region can have a direct impact on GRDP and indirectly have an impact through strong backward and forward linkage to other economic sectors. Analysis of backward and forward linkages can be performed using input-output tables that describe the role of each sector in the regional economy. The abundance of coal resources in South Kalimantan Province makes the mining sector the largest contributor to GRDP. Coal is an export commodity that has a very large percentage of the total regional export value. The enormous impact on GRDP, both in terms of business fields and final demand, is not accompanied by strong linkages to other economic sectors. The existence of the mining sector is unable to stimulate production growth in the backward sector and is unable to fulfill the final demand of the forward sector. Restrictions on coal exports to fulfill domestic energy resource needs are able to make the mining sector of South Kalimantan Province a key sector to support sustainable regional economic development.

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