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33rd Annual Conference of the International Group for Lean Construction, IGLC 2025

作者： Amaral, Tatiana Gondim Do Medeiros Maciel, Caio César Roriz Junior, Marcos Paulino de Paula, Gabriella Soares GO Goiânia Brazil Program in Production Engineering Federal University of Goiás Brazil Aparecida de GO Goiânia Brazil School of Environmental and Civil Engineering Federal University of Goiás Brazil

The study aims to develop an automated method for classifying making-do wastes using machine learning (ML) techniques. Manual classification of these wastes is prone to inconsistencies, especially in projects with large volumes of data. The automated method makes the process more efficient and accurate. The research is classified as quantitative and empirical, with a descriptive, exploratory and experimental approach. Data was collected using the Melius quality platform and covered six high-end multi-family residential developments from two construction companies in Goiânia. The data was processed in two phases: initially, compliance was checked manually and then the data was adjusted for the ml algorithm. Preliminary results indicate that the main causes of waste are related to lack of labor (67.11%) and problems with materials (15.48%). The highest incidences of waste categories were inadequate, sequencing (26.82%) and lack of equipment (18.21%). In terms of impact, the recurrence of rework (13.37%) and lack of terminality (13.19%) stand out. The neural network model showed unsatisfactory results, with a recall of 55.4% and precision of 53.7%. The study shows the potential of machine learning, but adjustments to the models are necessary to improve their effectiveness. © 2025, International Group for Lean Construction. All rights reserved.

关键词： Lean production

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The effect of artificial support material existence on removal of organic and nutrient in laboratory scale using plug flow reactor (PFR) 6

The effect of artificial support material existence on remov...

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6th environmental Technology and Management Conference, ETMC 2019

作者： Aphirta, Sarah Soewondo, Prayatni Maisa Zakiyya, Nida Wulandari Putri, Dyah Setiani Muntalif, Barti Environmental Engineering Master Program Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia Program Study of Environmental Engineering Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Indonesia

Artificial support material was examined to determine the removal capacity of organic pollutants and nutrients on laboratory scale using PFR system. The experiment was performed using artificial water with similar characteristics to Cikapayang River in three PFRs of 10.78 L. The PFRs were made of PVC pipes filled with an inert chemical substrate as an artificial support material. The process of pollutants removal in the PFR relies on a biological layer (biofilm) grown on the surface of the material support. Three type of C:N:P ratio used in this study were 30:15:1, 75:25:2, and 180:35:3. The results showed that the maximum removal efficiency of TSS, TN, TP, and COD in the preliminary tests were 85%, 87%, 71% and 79%, respectively. Moreover, the maximum water absorption capacity result was up to 30.8%. Organic substrate removal rate compared with first order and Strover-Kincannon substrate removal models prediction. The best fit model for this experiment was Stover-Kincannon model, with the average correlation coefficient up to 90% for all of the three reactors. SEM analysis shown that the microorganisms shape is coccus with the average size of 5 μm. © 2020 The Authors, published by EDP Sciences.

关键词： Nutrients

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Production of 5-hydroxymethylfurfural from fructose via inherent catalytic properties of a biphasic system without external catalyst addition

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Green Chemistry 2023年第3期26卷 1533-1541页

作者： Huynh, Quang Tam Padilla, Alexander F. de Luna, Mark Daniel G. Huang, Po-Jung Chen, Pei-Shih Saidina Amin, Nor Aishah Chen, Ku-Fan Chang, Ken-Lin Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung804 Taiwan Energy Engineering Program National Graduate School of Engineering University of the Philippines Diliman Quezon City1101 Philippines Department of Chemical and Materials Engineering National Central University Taoyuan320317 Taiwan Department of Public Health College of Health Sciences Kaohsiung Medical University Kaohsiung Taiwan Johor Bahru Skudai81310 Malaysia Department of Civil Engineering National Chi Nan University Nantou545 Taiwan Net Zero Emissions and Resource Recycling Technology Research Center National Sun Yat-Sen University Kaohsiung804 Taiwan

5-Hydroxymethylfurfural (5-HMF) is the key to unlocking the potential of biomass materials to transform into fuels, materials, and chemicals. In this study, an effective biphasic reaction system composed of a reaction phase (aqueous phase) and an extraction phase (organic phase) was used for the conversion of fructose to 5-HMF. Deep eutectic solvents (DESs) composed of different hydrogen bond donors and hydrogen bond acceptors, the ionic liquid [BMIM]Cl, aqueous choline chloride, aqueous betaine hydrochloride, and ethylamine hydrochloride were used as the reaction phase, and different organic solvents, such as methyl isobutyl ketone (MIBK), dimethyl sulfoxide (DMSO), toluene, ethyl butyrate, and gamma-valerolactone (GVL), were used as the organic phase. Experiments were conducted under optimal conditions simulated using the reaction surface method to obtain the maximum 5-HMF yield. The highest yields of 5-HMF obtained in reactions with DESs were 67.86%, 68.69%, and 71.40% for ChCl : OA, ChCl : Lac, and EaCl : Lac, respectively. However, adding dimethyl sulfoxide and betaine hydrochloride aqueous solution to the fructose conversion system resulted in a maximum yield of 90.42% ± 1.46% of 5-HMF without the use of catalysts. This study also demonstrated that betaine hydrochloride could be effectively reused four times. A 5-HMF yield of at least 80% indicates a green process suited towards sustainable development. © 2024 The Royal Society of Chemistry.

关键词： Fructose

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A Comparative Study of the Structural Response of Conventional Residential Buildings and Simple Healthy Instant Houses under Cianjur Earthquake Loads 8

A Comparative Study of the Structural Response of Convention...

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8th International Conference on engineering and Applied Science, ICEAT 2024

作者： Faizah, R. Fauzan, N. Monika, F. Rizqi, A. Civil Engineering Study Program Universitas Muhammadiyah Yogyakarta Bantul Indonesia Environmental Disaster and Geospatial Study Center Universitas Muhammadiyah Yogyakarta Bantul Indonesia East Jakarta City Indonesia

Earthquakes frequently cause significant damage to residential buildings and lead to loss of life. As a result, houses in earthquake-prone areas must adhere to earthquake-resistant building codes. Recently, RISHA (Simple Healthy Instant House), developed by PUSKIM (Center for Settlement Research and Housing Development), has been commonly implemented as housing in areas impacted by earthquakes, including East Nusa Tenggara, West Nusa Tenggara, Aceh, and Cianjur Regency, RISHA homes have been provided to residents in relocation areas. This study aims to assess the viability of using RISHA as a replacement for conventional houses in Cianjur Regency. The analysis predicts the structural response of RISHA and conventional houses to the Cianjur earthquake, using the spectrum response method based on SNI 1726:2019. Using SAP2000 software, the study evaluates deflection, bending moment, and base shear force. The findings indicate that RISHA exhibits lower deflection, bending moment, and shear force compared to conventional houses, with values being 12.5%, 65%, and 66.5% of those in traditional houses, respectively. Based on these results, it is concluded that RISHA offers superior structural performance in resisting earthquakes compared to conventional residential buildings. © Published under licence by IOP Publishing Ltd.

关键词： Houses

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Retrieval and Characterization of Plutonium-Beryllium Source for New Irradiation Facility

Retrieval and Characterization of Plutonium-Beryllium Source...

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2021 Transactions of the American Nuclear Society Winter Meeting, ANS 2021

作者： Olson, Codey Bates, William Cazalas, Edward Nuclear Engineering Program Department of Civil and Environmental Engineering University of Utah 201 Presidents' Cir Salt Lake CityUT84112 United States

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The Effects of Calcium Carbonate on Sodium Metasilicate-Activated Metakaolin-Based Geopolymer Pastes

SSRN

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SSRN 2024年

作者： Ren, Jie Acarturk, B. Cansu Dowdy, Nicolas D. Srubar, Wil V. College of Civil Engineering Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive BoulderCO80303 United States

The influence of calcium carbonate (CaCO3) on the alkali-activation kinetics, microstructure, and compressive strength of alkali-activated metakaolin (MK) geopolymer cements was investigated herein. Experimental results showed that replacing 10-50% of MK with ground CaCO3 particles delayed the acceleration stage of alkali-activation regardless of replacement amount. However, 10% CaCO3 replacement increased the overall degree of reaction and yielded pastes with similar 14- and 28-day compressive strengths compared to the experimental control with no CaCO3 addition. In comparison, 50% CaCO3 replacement led to a lower overall degree of reaction and lower compressive strengths through 28 days of curing. Experimental evidence substantiates that N-A-S-H gel forms in samples containing 0% and 10% CaCO3, while N-(C)-A-S-H gel and/or C-(N)-A-S-H are also present in the binding matrix near CaCO3 particles in samples with higher CaCO3 contents (i.e., 30% and 50%). While the CaCO3 particles were primarily composed of calcite, vaterite, a less stable form of CaCO3, was also evident in the samples containing 30% and 50%, suggesting that the CaCO3 particles were moderately reactive during the alkali-activation. © 2024, The Authors. All rights reserved.

关键词： Calcium carbonate

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Degradation of the Antibiotic Sulfamethoxazole by Ozonation: A Comprehensive Review

CleanMat

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CleanMat 2024年第1期1卷 16-51页

作者： Jéssica Martini Joshua O. Ighalo Ebuka Chizitere Emenike Jordana Georgin Elvis Carissimi Postgraduate Program in Civil Engineering Federal University of Santa Maria (UFSM) Santa Maria Brazil Department of Chemical Engineering Nnamdi Azikiwe University Awka Nigeria Tim Taylor Department of Chemical Engineering Kansas State University Manhattan Kansas USA Department of Pure and Industrial Chemistry Nnamdi Azikiwe University Awka Nigeria Department of Civil and Environmental Universidad de la Costa CUC Barranquilla Colombia Department of Sanitary and Environmental Engineering Federal University of Santa Maria (UFSM) Santa Maria Brazil

Sulfamethoxazole (SMX) is an antibiotic widely used for the treatment of several diseases, especially respiratory and urinary. Due to its widespread use, its presence in the environment has been on the rise. This study discusses the degradation of the antibiotic SMX through the ozonation process. SMX is preferentially degraded by the direct action of O 3 on the molecule, starting by breaking the double bonds in the aromatic ring. Through ozonation it is possible to obtain complete SMX degradation within 10 min, but the mineralization of the solution is not achieved, reaching total organic carbon removal efficiencies of 5%–60%, depending on the reaction time. Factors such as the presence of organic matter (OM) and the pH of the solution interfere with the degradation of SMX. The OM acts as a radical scavenger, decreasing the efficiency of degradation, while the pH interferes with the decomposition of O 3 into radicals and the dissolution of the oxidant in the medium, in addition to influencing the state of ionization of the SMX making it more or less prone to reactions. In general, most other remediation processes are carried out on a laboratory scale. To increase the level of these processes to a full scale, more pilot-scale studies are needed. In addition, it is necessary to focus on the practice of reusing materials, avoiding the generation of secondary pollution, and increasing the useful life of the material. The review also discusses the reaction mechanisms, intermediate compounds formed, mineralization of the solution, and factors that influence the process, which can help in making decisions for future studies to be carried out in the area. Prospects in the research area revolve around using metal–organic frameworks as molecular imprinting technology to modify heterogeneous catalysts, integration of external energy, bimetallic systems, and evaluation of deactivation mechanisms.

关键词： advanced oxidation processes emerging pollutants ozonation reaction mechanisms sulfamethoxazole water treatment

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Effective Municipal Wastewater Treatment at Low-Cost Using Coagulation/Precipitation Followed By Nano-Disinfection

Effective Municipal Wastewater Treatment at Low-Cost Using C...

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2021 AIChE Annual Meeting

作者： Mostafa, Mohamed K. Mahmoud, Ahmed S. Kamar, Mohamed T. Elshfai, Maha M. Moussa, M. Peters, Robert W. Cairo Egypt Egypt Environmental Engineering Program Zewail City of Science and Technology Giza Egypt Egypt Environmental Engineering Faculty of Engineering Mataria Helwan University Egypt Department of Civil Construction and Environmental Engineering University of Alabama at Birmingham BirminghamAL United States

ISBN: (纸本)9781713852834

Conventional wastewater treatment plants suffering from several industrial effluents overlap, trihalomethane (byproduct after free chlorine disinfection), and high construction cost. This study successfully prepared and compare a novel mixing of coagulants ferric/ferrous chloride (50:50) with other traditional individual coagulants such as ferric chloride, ferrous chloride, and aluminum chloride for domestic wastewater treatment. The results obtained indicated that the mixture of ferric/ferrous chloride is more efficient than other coagulants to meet the requirements of the Egyptian code for reuse of treated wastewater in different agricultural applications. Also, this study successfully replaced traditional chlorine addition by low-cost green synthesis of nano-Zero Valent Iron (GT-nZVI) for tertiary wastewater treatment. A continuous flow system was successfully built to achieve the treatment requirements in an economical and fast way. Finally, this study strongly supported using the proposed system rather than traditional wastewater treatment technologies in decentralized wastewater treatment units to overcome the combination of industrial effluents to the municipal wastewater networks and to reduce hazardous material produced after using traditional chlorine disinfectant. © 2021 American Institute of Chemical Engineers. All rights reserved.

关键词： Wastewater treatment

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The Effects of Calcium Carbonate on Sodium Metasilicate-Activated Metakaolin-Based Geopolymer Pastes

SSRN

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SSRN 2024年

作者： Ren, Jie Dowdy, Nicolas D. Acarturk, B. Cansu Srubar, Wil V. Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive BoulderCO80303 United States College of Civil Engineering

关键词： Calcium carbonate

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Contributions of Cleaning Solution Residues to Indoor Organic Surface Films

ACS ES&T Air

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ACS ES&T Air 2024年第2期1卷 129-138页

作者： Rachel O’Brien Emily Heery Catherine Shirilla Sumit Sankhyan Ashley Fowler Marina E. Vance Department of Civil and Environmental Engineering University of Michigan Ann Arbor Michigan 48109 United States Department of Chemistry William & Mary Williamsburg Virginia 23185 United States Department of Mechanical Engineering University of Colorado Boulder 1111 Engineering Drive 427 UCB Boulder Colorado 80309 United States Environmental Engineering Program University of Colorado Boulder 4001 Discovery Drive Boulder Colorado 80309 United States

Indoor surfaces become coated with a thin organic film that plays important roles in indoor chemistry. The sources for these films are important to understand to improve our ability to model and pr...

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