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3rd International Conference on Radioscience, Equatorial Atmospheric science and Environment, INCREASE 2023

作者： Aminah, Siti Riawan, Edi Syahputra, Muhammad Ridho Kuntoro, Arno Adi Master Program in Water Resource Management Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Indonesia Atmospheric Sciences Research Group Faculty of Earth Science and Technology Bandung Institute of Technology Bandung Indonesia Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Indonesia

ISBN: (纸本)9789819707393

This study uses Global Precipitation Measurement (GPM) and Coupled Model Intercomparison Project Phase 6 (CMIP6) precipitation data to identify extreme precipitation intensity and frequency changes in Indonesia. Extreme precipitation calculations were performed using the Gumbel distribution and return period fitted to annual maxima data. Extreme precipitation and frequency of extreme events were compared between the historical period and the near-future period (2026–2055) and the far-future period (2070–2099) to identify changes. The results showed that there were changes in extreme precipitation in Indonesia both in intensity and frequency of occurrence. Extreme precipitation with a 5-year return period in Indonesia generally has a change value in the range of − 5 to + 25% with most areas likely to increase. The increased value reaches + 20% in the near-future period and + 40% in the far-future period. For the frequency of extreme precipitation above the 5-year return period in Indonesia, the change value is generally in the range of − 40 to + 120% with most areas likely to increase. The increased value reaches + 160% in the near-future period and + 200% in the far-future period. In the higher emission scenario (SSP5-8.5), the areas with higher values of increase will expand both in the change in intensity and frequency of occurrence. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Climate change

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Relationship between drought and soil erosion based on the normalized differential water index(NDWI)and revised universal soil loss equation(RUSLE)model

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Regional Sustainability 2024年第4期5卷 133-144页

作者： Muhammad RENDANA Wan Mohd Razi IDRIS Febrinasti ALIA Supli Effendi RAHIM Muhammad YAMIN Muhammad IZZUDIN Department of Chemical Engineering Faculty of EngineeringUniversitas SriwijayaIndralaya30662Indonesia Master Program of Environmental Management Graduate SchoolUniversitas SriwijayaPalembang30139Indonesia Department of Earth Sciences and Environment Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Civil Engineering Faculty of EngineeringUniversitas SriwijayaIndralaya30662Indonesia Master Program of Agricultural Sciences Graduate Study ProgramUniversitas Muhammadiyah PalembangPalembang30263Indonesia Department of Agribusiness Faculty of AgricultureUniversitas SriwijayaIndralaya30662Indonesia Department of Sociology Faculty of Social and Political SciencesUniversitas SriwijayaIndralaya30662Indonesia

The Langat River Basin in Malaysia is vulnerable to soil erosion risks because of its exposure to intensive land use activities and its topography,which primarily consists of steep slopes and mountainous ***,climate change frequently exposes this basin to drought,which negatively affects soil and water ***,recent studies have rarely shown how soil reacts to drought,such as soil ***,the purpose of this study is to evaluate the relationship between drought and soil erosion in the Langat River *** analyzed drought indices using Landsat 8 satellite images in November 2021,and created the normalized differential water index(NDWI)via Landsat 8 data to produce a drought *** used the revised universal soil loss equation(RUSLE)model to predict soil *** verified an association between the NDWI and soil erosion data using a correlation *** results revealed that the southern and northern regions of the study area experienced drought *** predicted an average annual soil erosion of approximately 58.11 t/(hm^(2)·a).Analysis of the association between the NDWI and soil erosion revealed a strong positive correlation,with a Pearson correlation coefficient of *** assumed that the slope length and steepness factor was the primary contributor to soil erosion in the study *** a result,these findings can help authorities plan effective measures to reduce the impacts of drought and soil erosion in the future.

关键词： Drought Soil erosion Normalized differential water index(NDWI) Revised universal soil loss equation(RUSLE) Langat River Basin

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Gender Mainstreaming in Drought Disaster Risk Reduction 2

Gender Mainstreaming in Drought Disaster Risk Reduction

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2nd International Conference on sciences and Technology Applications, ICOSTA 2020

作者： Retno Susilorini, Rr M. I. Lika, Rusnianti Rambu Sriyana Angghita, Lintang Jata Sinaga, Julio Ignatius Department of Infrastructure and Environmental Engineering Faculty of Environmental Science and Technology Soegijapranata Catholic University Semarang Indonesia Master Program of Environmental and Urban Studies Faculty of Environmental Science and Technology Soegijapranata Catholic University Semarang Indonesia Department of Civil Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

Climate change has affected the whole world and caused disasters, include drought. Since Tana Mbanas village in Central Sumba District is the driest remote area in eastern region of Indonesia, gender inequality has affected in daily life of people in the village instead of other social and environmental problems. This research aimed to evaluate how gender mainstreaming implemented in drought disaster risk reduction in Tana Mbanas village in Central Sumba Regency, East Nusa Tenggara Province. The result of the research is expected to become a mirror that reflects Sumba island gender and development issues. The research took place in Tana Mbanas village in Central Sumba Regency, East Nusa Tenggara Province, and conducted by qualitative method with purposive data sampling. The steps taken in the research were observation, data collecting by questionnaire and in-depth interview to respondents, and literature review. It was reported that Tana Mbanas village people has given water management assistance by village fund, conducting water management counselling, saving water, and harvesting rain systems in every household. This research meets conclusions that: (1) Several programs and planned actions in water supply system and infrastructure development have become initiatives of government agencies of village authorities, BPBD and Public Work Agency of Central Sumba Regency;(2) People demonstrated vulnerability to drought as well as lack of water supply and also water resources;(3) Strong efforts should be conducted to educate people and increase women capacity in coping issues of poverty, drought, and lack of water supply;and (4) Government agencies and other private institutions have to build women capacity as their participation in enhancing gender equality and mainstreaming gender. © Published under licence by IOP Publishing Ltd.

关键词： Water management

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Identification of subsurface soil layers in Sutami Dam area and its surroundings using magnetic methods 2

Identification of subsurface soil layers in Sutami Dam area ...

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2nd International Conference and Exhibition on sciences and Technology, ICEST 2020

作者： Sutasoma, M. Susilo, A. Sunaryo, S. Suryo, E.A. Cahyo, R.H.D. Doctoral Program of Physics Faculty of Science Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia Geophysics Engineering Faculty of Science Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia Civil Engineering Faculty of Engineering Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia Master Program of Physics Faculty of Science Brawijaya University Jl. Veteran Jawa Timur Malang Indonesia

The research was conducted to determine the subsurface layer type in the Sutami Dam area using magnetic methods. This study aims to determine the subsurface soil type in the area around the Sutami Dam. The instrument used in data collection was the Proton Precession Magnetometer (PPM) Scientrex Model G-8. The data collection area covers the Kromengan region (112.494oE;8.129oS) to the Sukorame area (112.358oE;-8.213oS). The area covers the Sutami Dam area. The research area is 15 km x 15 km or with an area of 225 KM with a space between points 300 m. From the data acquisition, it was found that the number of data collection points was 1372 points. The types of subsurface layers based on the 2,5 D Talwani modeling are soil, pumice, limestone, sandy tuff, sandstone, andesite, and lava. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Lime

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Application of level-set type topology optimization for defect topology identification analysis using hammering response data

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Materials Today: Proceedings 2023年

作者： Kurahashi, Takahiko Koike, Towa Kishida, Masayuki Murakami, Yuki Ikeda, Fujio Department of Mechanical Engineering Institute of GIGAKU Nagaoka University of Technology Niigata Nagaoka Japan Mechanical Engineering Master's Program Graduate School of Engineering Nagaoka University of Technology Niigata Nagaoka Japan Science of Technology Innovation 5-year Integrated Doctoral Program Graduate School of Engineering Nagaoka University of Technology Niigata Nagaoka Japan Department of Civil Engineering National Institute of Technology Nagaoka College Niigata Nagaoka Japan Department of Mechanical Engineering National Institute of Technology Nagaoka College Niigata Nagaoka Japan

In this study, we presented the defect identification analysis based on the level-set type topology optimization using hammering testing data. To simulate the oscillation behavior of concrete structure, the equation of motion in three dimensions is introduced as the governing equation. The performance function is defied by the time integral of the squared residual between the computed and observed displacements. The problem is to find the defect topologies so as to minimize the performance function. In the model with a small number of observation points, it was found that nonexistent defects disappeared by using the weighted sensitivity method. In addition, it was confirmed that the model with a large number of observation points did not show the same tendency as the model with a small number of observation points because the accuracy of defect identification increased as the number of observation points increased. © 2023

关键词： Defects

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Optimizing dispersion of torrefied spent coffee grounds for enhanced biochar-EVA composite properties through sodium percarbonate-assisted treatment

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Journal of Industrial and engineering Chemistry 2025年

作者： Lee, Kuan-Ting Gabriela, Situmorang Chen, Wei-Hsin Rajendran, Saravanan Selvarajoo, Anurita Department of Chemical and Materials Engineering Tunghai University Taichung407 Taiwan International Master Degree Program on Energy Engineering National Cheng Kung University Tainan701 Taiwan Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung411 Taiwan Instituto de Alta Investigación Universidad de Tarapacá Arica1000000 Chile Department of Civil Engineering Faculty of Science and Engineering University of Nottingham Malaysia

This study aims to optimize biochar by combining 10 % sodium percarbonate with 90 % spent coffee grounds and torrefying at 300 °C for 30 min. Biochar enhances black color dispersion in a composite when blending the optimal biochar and ethylene vinyl acetate. The maximum carbon content of the optimal biochar is 59.97 %, exhibiting similar dispersion, packing density, pore size, and contact angle to carbon black. The optimal biochar's specific surface area and total pore volume are 7.12 m2·g−1 and 0.0018 cm3·g−1, respectively, 2.9 times and 1.2 times that of untreated torrefied spent coffee grounds with SP treated. The mechanical properties of the composite, which is blended with 15 wt% of the optimal biochar to ethylene vinyl acetate through trade-off analysis, indicate a tensile strength and Young's modulus of 1.03 MPa and 9.69 MPa, respectively. As the amount of blended optimal biochar increases, the tensile strength decreases while Young's modulus increases. Compared with a composite blended with the same 15 wt% of carbon black, the tensile strength and Young's modulus are 0.77 MPa and 9.55 MPa, respectively. In conclusion, the optimal biochar is a potential alternative material that could replace carbon black. This finding aligns with the developmental direction of achieving negative carbon emissions, promoting a circular economy and valorizing waste. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Tensile strength

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Assessing long-term morphological changes in the Vietnamese Mekong Delta 12th

Assessing long-term morphological changes in the Vietnamese ...

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12th International Conference on Fluvial Hydraulics, River Flow 2024

作者： Ahmed, M.F. Binh, D.V. Nguyen, B.Q. Kantoush, S. Sumi, T. Doan, N.L.P. Tuan, L.A. Nguyen, N.T. Vuong, N.D. Vu, H.T. Thang, H.N. Quyen, L.V. Water Resources Research Center Disaster Prevention Research Institute Kyoto University Kyoto Uji-shi Japan Master program in Water Technology Reuse and Management Faculty of Engineering Vietnamese-German University Binh Duong Province Ben Cat Town Viet Nam University of Danang- University of Science and Technology Nguyen Luong Bang Danang Viet Nam Research Institute for Climate Change Can Tho University Ninh Kieu District Can Tho City Viet Nam Southern Institute for Water Resources Planning Ho Chi Minh City Viet Nam Faculty of Civil Engineering Technische Universität Dresden Germany Faculty of Fisheries University of Agriculture and Forestry Hue University Hue City Viet Nam

ISBN: (纸本)9781032757216

The Vietnamese Mekong Delta (VMD) has experienced significant morpho logical changes over decades, resulting in profound socioeconomic and environmental conse quences. This study investigated the VMD’s spatial and temporal morphological alterations from 1998 to 2020, utilizing four bathymetric datasets and remote sensing techniques. The ana lysis revealed that the average annual riverbed incision rate in the Tien and Hau Rivers dimin ished from-0.19 m/year (1998–2005) to-0.11 m/year (2005–2017) and further dropped to-0.10 m/year (2017–2020). The upper reaches of the Tien and Hau Rivers exhibited pronounce deepening over the three periods, whereas their lower reaches witnessed a converse trend. Add itionally, the study unveiled the average annual riverbank migration rate along the VMD, ran ging from 5 m/year to-5 m/year during the same examined periods. Notably, the dynamic processes of erosion and deposition intensified between 2017 and 2020. This research aims to provide crucial insights for refining sediment management strategies in the VMD. © 2025 The Author(s).

关键词： Miocene

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First-Attempt Application of Sponge Membrane Bioreactor Treating 3,4-Dichlorophenol Contaminated Wastewater at Different Hydraulic Retention Times

SSRN

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SSRN 2024年

作者： Nhu Nguyet, Phan Nguyen, Thi-Kim-Ngan Thuan, Ngo Thi Yen, Duong Hoang Vo, Thi-Kim-Quyen Nguyen, Thi-Yen-Phuong Bui, Xuan-Thanh Watari, Takahiro Yamaguchi, Takashi Hatamoto, Masashi Faculty of Environment University of Science Ho Chi Minh City Viet Nam Ho Chi Minh City Viet Nam Ho Chi Minh City Viet Nam School of Chemical and Environmental Engineering International University Ho Chi Minh City Viet Nam Master Program in Water Technology Reuse and Management Vietnamese German University Binh Duong Province Viet Nam Ho Chi Minh City Viet Nam Department of Civil and Environmental Engineering Nagaoka University of Technology Niigata Japan Department of Science of Technology Innovation Nagaoka University of Technology Niigata Japan

Chlorophenols (CPs) are priority pollutants which persist in the environment for up to 28 years. The release of Chlorophenol derivatives into aquatic environments poses serious risks to living beings because of their mutagenic, carcinogenic, genotoxic, and teratogenic effects. This study highlights the first application of a Sponge Membrane Bioreactor (Sponge-MBR) for treating 3,4-Dichlorophenol (3,4-DCP)-contaminated wastewater. Herein, a lab-scale Sponge-MBR was conducted to treat 3,4-DCP-contaminated wastewater at various hydraulic retention times (HRTs) ranging from 5 to 15 h in terms of organic matter and 3,4-DCP removal, and microbial community shifts. The sludge characteristics were also performed. Results showed that a rise in HRT at 5, 10 and 15 h increased the removal efficiencies of COD (84 – 94%) and 3,4-DCP (90 – 96%). Under 30-day operation period at optimal HRT (15 h), corresponding to OLR of 2.84 ± 0.18 kg COD·m-3·day-1, the removal efficiencies of both 3,4-DCP and COD were 96% with the average removal rate of 356 ± 83 mg COD·g-SS-1·day-1 and 1.62 ± 0.38 mg 3,4-DCP·g-SS-1·day -1. The attached biomass in sponge media was recorded higher than suspended biomass and contributed 49 – 66% of the total biomass, indicating that the microbial community shifts could degrade organic matter and remove 3,4-DCP. Proteobacteria dominated the microbial community because of their adaptability to environmental changes. The findings derived from this study provide useful perspectives on the application of Sponge-MBR treating 3,4-DCP-contaminated wastewater and offer Sponge-MBR as a potential alternative for treating wastewater contaminated with toxic chemicals. © 2024, The Authors. All rights reserved.

关键词： Biomass

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The capacity of osmotic for the living of aquatic plant at the Area of Tahura KGPAA Mangkunagoro I, the Province of Central Java

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AIP Conference Proceedings 2023年第1期2683卷

作者： Masrochatun Sutrisno Anggoro Ferry Hermawan Master Program of Environmental Science School of Post-Graduate Diponegoro University Semarang - Indonesia Department of Aquatic Resources Faculty of Fisheries and Marine Science Diponegoro University Semarang – Indonesia Department of Civil Engineering Faculty of Engineering Diponegoro University Semarang – Indonesia

The existence of aquatic plants has a significant influence on the biota living at wellspring. The osmotic pressure is significant research to understand the adaptation of the environment changing to organism physiology. This research aims to know the Osmotic Work Rate by comparing osmolarity water value to aquatic plant plasma. The research method is the descriptive analysis of laboratory test results. The water sample was taken from the seven locations of the wellspring. Osmotic work rate is taken from comparing the plasma osmolarity value of the aquatic plant to water Osmolarity. Osmotic work rate zero means osmoregulation patterns isosmotic. The osmotic work rate greater than zero implies osmoregulation patterns hyperosmotic regulatory and osmoregulation patterns hypo-osmotic regulatory if the Osmotic work rate is less than zero. The patterns are used from the seven locations of good springs are the same, osmoregulation patterns of Hyperosmotic regulatory to the environment because the plasma osmolarity of water plants is more significant than water osmolarity.

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Taguchi optimization and analysis of variance for thermoelectric generators with forced convection air cooling

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Applied Thermal engineering 2023年 231卷

作者： Chen, Wei-Hsin Carrera Uribe, Manuel Luo, Ding Jin, Liwen Huat Saw, Lip Lamba, Ravita Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung411 Taiwan International Master Degree Program on Energy Engineering National Cheng Kung University Tainan701 Taiwan College of Electrical Engineering & New Energy China Three Gorges University Yichang443000 China Institute of Building Environment and Sustainable Technology School of Human Settlements and Civil Engineering Xi'an Jiaotong University Xi'an China Lee Kong Chian Faculty of Engineering and Science Tunku Abdul Rahman University Kajang43000 Malaysia Department of Electrical Engineering Malaviya National Institute of Technology Jaipur India

In recent years, humanity has experienced the effects of using unsustainable energy sources that pollute the environment while being inefficient. Most of the primary energy input used in energy conversion processes is lost in the form of heat. Thermoelectric generators (TEGs) have the potential to recover some of this wasted heat;however, their low energy conversion efficiency needs to be addressed. Previous literature has shown effective optimization of thermoelectric generation systems through statistical tools such as the Taguchi method that optimized all the parameters that affect the outcome of the system. To this date, no research has considered wind speed for convection heat transfer as one of the optimizable parameters. This study aims to optimize the operating conditions of commercially available TEGs that are cooled by forced convection simulating naturally occurring wind speeds and operate under low-quality waste heat temperatures to improve the TEG performance further. Two commercially available TEGs are optimized via the Taguchi method. The Taguchi method is implemented with three parameters and three levels, making an L9 orthogonal array. The objective function is the maximum output power. The optimized parameters are the hot side temperature, the heat sink size, and the wind airspeed. Analysis of variance (ANOVA) is used alongside the Taguchi orthogonal array for the statistical analysis of the results. The optimization results show that the hot side temperature is the most influential parameter to the output power. In addition, the change in the heat sink size also significantly influences the output power, whereas the impact of the wind speed is not as significant. In addition, interaction analysis between the parameters is performed. The Taguchi method yields satisfactory optimization results. The optimized system yields 0.65 W of power at 140 °C hot side temperature, Model K402 heat sink, and 3.7 m·s−1 wind speed. The influence of the air velocity

关键词： Design of experiments

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