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The comparison of empirical and finite element methods to evaluate soil foundation capacities for coastal dike

IOP Conference Series: Materials Science and engineering 2020年第1期930卷

作者： Suyuti Zulkarnain K. Misbah Zhafirah M. Ardhana Lecturers at Study Program of Civil Engineering Faculty of Engineering Universitas Khairun North Maluku Indonesia Undergraduate Student at Study Program of Civil Engineering Faculty of Engineering Universitas Khairun North Maluku Indonesia

There are over 6,300km of coastlines in the North Maluku province of Indonesia due to tidal waves which originate from the pacific ocean. The waves deposit finely loosed materials and light soil formations on coastlines, therefore causing abrasion. A common example occurred in Toseho, Tidore, and Archipelago districts. Moreover, the local residence has been faced with this challenge for up to thirty years. For this reason, deliberations to construct a dike became significant, although, the soil properties are vulnerable. This reasearch, therefore, compares the empirical calculation to the finite element method (FEM) to ascertain soil foundation capacities. The results showed the safety factor, Fs, for dike height, Hd, of 3.5 m and width bottom, B1, of 12.5m appeared below 2.0 for soil friction s of 10~ 15°, while estimates above 2.0 depicts soil friction s of 20°. Furthermore, the soil stresses beneath the dike were determined empirically at qmax of 5.97 t/m2 and σs of 4.57 t/m2, while FEM evaluated the deformation elastic at 12.5 cm.

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Seasonal Influence on Pollution Index and Risk of Multiple Compositions of Microplastics in an Urban River

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SSRN 2022年

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 SydneyNWS 2007 Australia

The emerging contaminant microplastics (MPs) are getting worldwide attention for their ubiquitous occurrence and potential risk in 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 was more abundant in the dry season compared with wet seaon. Similarly, the mixture of different MPs polymers was more diverse in the dry season. The related pollution indexes such as the contamination factor (CF) and pollution load index (PLI) showed that the majority of the water samples in Houjin River was heavily polluted and higher in the dry season. The higher risk quotient (RQ) of MPs in the dry season was also observed. To sum up, the results of this study indicate the seasonal effects on the pollution and risk of multiple compositions of MPs in the urban river, suggesting higher impacts of riverine MPs pollution in the dry season, as well as the potential increase of MPs may lead to health risk in the future. © 2022, The Authors. All rights reserved.

关键词： Risk assessment

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Maximum deflection of three span continuous bridge using rotation data based on 3 dimensional model

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

作者： M. Suangga T. Haripriambodo Civil Engineering Department Faculty of Engineering Bina Nusantara University Jakarta Indonesia 11480 Master Program in Civil Engineering Tarumanagara University Jakarta Indonesia 11480

The Structural Health Monitoring System on the bridges continue to develop to ensure that the bridge being monitored is in good condition to serve traffic. One of the main bridge's parameter observed is deflection of the bridge. Various methods has been developed to be able to monitor deflection accurately and economically. This study presents a method of determining the maximum deflection of a three-span continuous bridge using rotation data obtained from a tilt meter with linear regression. Initial data were obtained from FEM simulations under various load conditions to obtain the maximum deflection value and the rotations. Furthermore, linear regression was carried out to obtain the relationship between the four rotational data and the maximum deflection. The accuracy of the maximum deflection value is then compared with the results of the analysis using FEM. The accuracy rate obtained in this study is about 93.6%.

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The California bearing ratio and unconfined compressive strength of clay–palm kernel shell mixtures

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AIP Conference Proceedings 2022年第1期2578卷 030001页

作者： Yulian Firmana Arifin Muhammad Ridha Engineer Profession Education Study Program University of Lambung Mangkurat Jl. A. Yani km 35.5 Banjarbaru70714 Indonesia Civil Engineering Study Program University of Lambung Mangkurat Jl. A. Yani km 35.5 Banjarbaru70714 Banjarbaru Indonesia

Palm Kernel Shell (PKS) is a by-product of the palm oil processing industry that is typically located in areas with very soft soil, particularly in South Kalimantan. It has been extensively studied as a replacement for concrete granular material. Hence, research into the potential use of PKS as a supplement to stabilize soft clay is required. This study aimed to investigate the California Bearing Ratio (CBR) and unconfined compressive strength (UCS) of compacted soft clay mixed with PKS. The clay was taken from a location around Banjarmasin. The sizes of PKS were 4.75mm (i.e. sieve No. 4) and 2mm (i.e. sieve No. 10) for CBR and UCS tests, respectively. Based on the dry mass, the clays was mixed with a PKS content of 2.5%, 5%, 10%, 15%, and 20%. The CBR and UCS tests were performed to the compacted specimens. The presence of PKS resulted made it easy in compacting the soft soil and increasing the CBR and UCS of the mixtures. The maximum CBR and UCS were obtained at the highest density (i.e. a PKS content of 2.5%). The values increased 1.5 and 3 times higher for CBR and UCS, respectively, as compared to the soil without PKS.

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Contemporary urban environment development: The existence of bird markets as rural cultural migration

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AIP Conference Proceedings 2023年第1期2595卷

作者： Nur Mawaddah Wahyu Kusuma Astuti Ismalia Husna Haerul Anwar Amir Machmud Department of Urban and Regional Planning Tarumanagara University Jakarta Indonesia Department of Parasitology Faculty of Medicine Universitas Malahayati Lampung Indonesia Environmental Engineering Study Program Institut Kesehatan dan Teknologi PKP DKI Jakarta Jakarta Indonesia Graduate Institute of Environmental Engineering National Central University Taoyuan Taiwan

Bird markets remain part of Jakarta’s cultural interests in the midst of Jakarta’s development path to modernization. It brings us to a time-space imagination where birds were owned and traded to resemble the social status of a person, especially in Javanese traditions. It also, therefore, marks the migration period of Javanese to Jakarta who still retains their tradition and culture in the capital city. Today, several markets even persist in the contestation between the process of space acquisition for bird enthusiasts, the formal grids and regulation of urban development, also endemic animals, and environmental conservation. Although contested, it is suggested that the bird market reflects what Foucault implied about heterotopia. The bird market represents a liminal space of the ideal romantic-traditional society which in reality does not ‘fit’ under the hegemonic urban construct - yet it constructs the way we relate to urban life today. This article seeks through the possibility of exploring ‘this otherness’ the re-positioning of the traditional market in Jakarta today and how it constructs and is re-constructed by the dominant discourse of the city. It is also argued that this memory of a time that the bird market retains cannot be detached from the social networks of bird enthusiasts who are engaged not only in economic activities of selling, buying, or biding but also in chirping contests. Not only the social value, but the bird market also depicts a political-economic logic between traders, contests organizer, competition jury, and the market as to control - boost or suppress the price of birds and promote particular kinds of birds to be included in the competition which often leads to further exploitation of bird in the natural reserve. This paper concludes on how this nexus of the social, political, cultural, and environmental context of the existence of the bird market shapes and re-shapes the city today and how each actor related to it reflects on the tra

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Simple Span Bridge Loading Based on Weight in Motion Data

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

作者： M. Suangga Mahathir Civil Engineering Department Faculty of Engineering Bina Nusantara University Jakarta Indonesia 11480 Master Program in Civil Engineering Tarumanagara University Jakarta Indonesia 11480

Over Dimension Over Load (ODOL) vehicle is claimed to be the cause of a number of fatal accidents and damage to road infrastructure in Indonesia and has become a serious issue for roads and bridges maintenance. Over loaded vehicles can result in damage to the bridge, reduced bridge capacity and can even result in collapse of the bridge. Therefore the characteristics of the actual vehicle load need to be known and compared to the bridge design load according to the bridge design code and standard. In this paper, an analysis is carried out on the actual traffic load data obtained from the measurement results using Weight in Motion (WIM) in Kaligawe, Semarang, Indonesia. Monte Carlo simulation is used to simulate the arrival of the vehicle. The results of vehicle load simulation are then applied to a simple span bridge with a span of 30, 40, 50 m. The bending moment and shear force obtained due to actual load compared to the magnitude of the bending moment and shear by applying Indonesia Bridge Loading Standard. The results show that 43 percent of vehicles are overloaded. The bending moment and shear force caused by actual load is less than the design bending moment and shear force for 30 m, 40 m and 50 m bridge span.

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Overview the local barrow material of nickel slag mixture as an aggregate foundation layer

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IOP Conference Series: Earth and Environmental Science 2021年第1期622卷

作者： Sulha Umran Sarita D3 Civil Engineering Study Program Vocational Education Program Halu Oleo University Kendari Indonesia 93232

Southeast Sulawesi Province has numbered material sources, used as barrow to meet road infrastructure needs. Nickel slag production was a waste material of the nickel mining manufacture carry on to growth in this province. This research is one of the exertions to use waste nickle mining manufacture by mixing local barrow material. The mixture of materials is expected to meet specification of pavement layer for road constructions. This research uses quarry sirtu material in Nanga-Nanga and Lasolo Villages as foundation layer material. The method used is an experimental method on the form of gradation, compaction of modified proctor and CBR test. The result showed that the barrow material with nickel slag composition to material from Nanga-Nanga was 60:40 and Lasolo 50:50 met the grade specification as B class foundation material. Base on the AASHTO classification, this material mixture was included within the A1 category. According to CBR test result with unsoaked compaction conditions, Lasolo material has a CBR value of 26.83% dan Nanga-Nanga material reaches 61.78%. The mixture of material Lasolo is not good enough to be used as a highway barrow material. Whereas mixture Nanga-Nanga with nickel slag is applicable for highway capping layer material.

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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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Applications of engineered biochar in remediation of heavy metal(loid)s pollution from wastewater: Current perspectives toward sustainable development goals

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Science of the Total Environment 2024年 926卷 171859页

作者： Tran, Thien-Khanh Huynh, Loan Nguyen, Hoang-Lam Nguyen, Minh-Ky Lin, Chitsan Hoang, Tuan-Dung Hung, Nguyen Tri Q. Nguyen, X. Hoan Chang, S. Woong Nguyen, D. Duc Advanced Applied Sciences Research Group Dong Nai Technology University Bien Hoa City76100 Viet Nam Faculty of Technology Dong Nai Technology University Bien Hoa City76100 Viet Nam Department of Civil Engineering McGill University Montreal Canada Faculty of Environment and Natural Resources Nong Lam University Hamlet 6 Linh Trung Ward Thu Duc City Ho Chi Minh City700000 Viet Nam Ph.D. Program in Maritime Science and Technology National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan School of Chemistry and Life Science Hanoi University of Science and Technology No. 1 Dai Co Viet Hai Ba Trung Hanoi100000 Viet Nam Vietnam National University Hanoi - School of Interdisciplinary Sciences and Arts 144 Xuan Thuy Street Cau Giay District Hanoi100000 Viet Nam Ho Chi Minh City University of Industry and Trade Ho Chi Minh City Viet Nam Department of Civil & Energy System Engineering Kyonggi University Suwon16227 Korea Republic of Institute of Applied Technology and Sustainable Development Nguyen Tat Thanh University Ho Chi Minh City700000 Viet Nam

Environmental pollution of heavy metal(loid)s (HMs) caused adverse impacts, has become one of the emerging concerns and challenges worldwide. Metal(loid)s can pose significant threats to living organisms even when present in trace levels within environmental matrices. Extended exposure to these substances can lead to adverse health consequences in humans. Removing HM-contaminated water and moving toward sustainable development goals (SDGs) is critical. In this mission, biochar has recently gained attention in the environmental sector as a green and alternative material for wastewater removal. This work provides a comprehensive analysis of the remediation of typical HMs by biochars, associated with an understanding of remediation mechanisms, and gives practical solutions for ecologically sustainable. Applying engineered biochar in various fields, especially with nanoscale biochar-aided wastewater treatment approaches, can eliminate hazardous metal(loid) contaminants, highlighting an environmentally friendly and low-cost method. Surface modification of engineered biochar with nanomaterials is a potential strategy that positively influences its sorption capacity to remove contaminants. The research findings highlighted the biochars' ability to adsorb HM ions based on increased specific surface area (SSA), heightened porosity, and forming inner-sphere complexes with oxygen-rich groups. Utilizing biochar modification emerged as a viable approach for addressing lead (Pb), cadmium (Cd), arsenic (As), mercury (Hg), and chromium (Cr) pollution in aqueous environments. Most biochars investigated demonstrated a removal efficiency >90 % (Cd, As, Hg) and can reach an impressive 99 % (Pb and Cr). Furthermore, biochar and advanced engineered applications are also considered alternative solutions based on the circular economy. © 2024 Elsevier B.V.

关键词： Nanostructured materials

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