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Nanobioremediation of heavy metals using microorganisms
(Elsevier BV, 2025-09)
HESAM, KAMYAB
;
Shreeshivadasan Chelliapan
;
Elham Khalili
;
ZULETA MEDIAVILLA, DIANA PATRICIA
;
KHORAMI, MAJID
Heavy metals (HMs) in soil are a big threat to environmental and agricultural sustainability. This review discusses the development of the nanobioremediation paradigm (an approach combining nanotechnology and microbiological processes) for the treatment of HM toxicity. Recent advances in nanoparticle (NP)-based approaches to their ability to improve microbial detoxification methods, such as adsorption, redox transformation, and enzyme activation forms of microbial detoxification are discussed. Key findings suggest that many engineered NPs (e.g., zero-valent iron, biogenic metal oxides) can enhance HM immobilization efficiencies and contour microbial performances and functions of the soil microbiome. Still, there are areas of uncertainty regarding NP-microbe-soil interactions, long-term ecotoxicological effects, and applicability at the field level that are critical to be discussed. Future research directions are advised to focus on the eco-designed NPs, optimizing microbial consortia specific to the soil, and interdisciplinary frameworks linking the laboratory methods and materials to the real-world applications.
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Investigating the optimal replacement percentage of various types of coal waste with chemical additives in concrete construction for sustainable energy applications
(Elsevier BV, 2025-09)
Mahdi Shariati
;
Mehdi Tazikeh
;
Morteza Naghipour
;
Bagher Hoseinian
;
Hesam Kamyab
The large coal production and consumption has caused environmental problems worldwide as a source of energy production with irreparable effects on soil, water, and the ecosystem. In addition, producing coal waste in coal washing plants and burying it intensifies the issue in nature. Due to the rising generation of coal waste from various sources, this study utilized several forms of coal waste obtained from a coal-washing plant in the production of both structural concrete (with a water-cement ratio of 0.54) and non-structural concrete (with a water-cement ratio of 0.7). The impact of coal waste on compressive strength (CS) was examined at curing ages of 7, 28, and 56 days. Various percentages of coal waste were substituted for both cement and sand. A superplasticizer was incorporated into the concrete mixtures to enhance the workability and achieve the desired slump and strength levels. According to the compressive strength findings, the ideal replacement level of sand with jig coal waste was 30 %. For 56-day-old specimens, the optimal substitution rates for cement with jig coal waste powder, flotation coal waste, and coal waste ash were found to be 10 %, 10 %, and 20 %, respectively. Notably, adding 10 % coal waste powder and coal waste ash increased compressive strength by 22 %, 23 %, and 44 % at 56 days.
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Impact of carbon on global and regional economies: analyzing economic growth, employment, and trade balances through artificial neural networks
(Springer Science and Business Media LLC, 2025-03-08)
Siqi Liu
;
Yousef Zandi
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Alireza Sadighi Agdas
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Mohamed Amine Bouraoui
;
Anas A. Salameh
The study presents a framework for the sustainable carbon-based nanomaterials, focusing on Carbon Nano Tubes (CNTs). The framework integrates performance, hazard, and economic considerations toward the development of CNT-enabled products. Through Life Cycle Analysis (LCA) and environmental degradation studies, the research highlights the energy-intensive nature of CNT production, the persistence of CNTs in the environment, and the associated ecotoxicity risks. Functionalization of CNTs is emphasized as a crucial strategy to enhance biodegradability and reduce toxicity. The study also addresses the economic trade-offs, noting that while CNTs offer superior functional performance, their high production costs and energy demands must be carefully managed. The proposed framework aims to ensure that CNTs maximize their benefits while minimizing their environmental and health impacts, thereby supporting the sustainable advancement of carbon nanomaterials in various applications. The study found that CNT production is highly energy-intensive, but scaling up can improve efficiency. CNTs persist in the environment, with partial degradation, indicating potential long-term ecological risks. Functionalization enhances biodegradability and reduces toxicity, helping to balance performance with sustainability.
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Analysis of the Influence of Sugarcane Bagasse Fibers in the Natural State on the Mechanical Properties of Concrete
(Informa UK Limited, 2025-03-25)
Paúl Molina Román
;
Christopher Capelo
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Mariela Anaguano-Marcillo
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Carlos Solórzano
;
Jorge Albuja-Sánchez
This study aims to analyze the influence of sugarcane bagasse fiber (SCBF) without treatment on concrete and its impact on carbon footprint production. This review studies the impact of SCBF on the compressive strength, flexural strength, direct tensile strength, and elasticity modulus, considering fiber percentages of 1%, 3%, 5%, and 6%. The results showed that SCBF had a negative influence on concrete because as the percentage of fiber increased, it started to become invasive in the concrete mix and proportionally influenced the strength reduction, obtaining a maximum decrease of 60.96% in the compressive strength. However, the CO2 emissions decreased as the fiber percentage increased, generating maximum emission savings of 17.19%.
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Behavior of steel storage pallet racking connection - A review
(2019)
Chulin Chen
;
Lei Shi
;
Mahdi Shariati
;
Ali Toghroli
;
Edy Tonnizam Mohamad
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Nano-silica in Holcim general use cement mortars: A comparative study with traditional and prefabricated mortars
(2024)
Mohammadfarid Alvansazyazdi
;
Jorge Figueroa
;
Alex Paucar
;
Gilson Robles
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KHORAMI, MAJID
Nano-silica’s growing use in construction, known for enhancing strength and durability by reducing porosity, drives this research’s significance, especially considering Ecuador’s reliance on cement in construction. A comprehensive comparative study on mortars made with General Use cement and aggregates from Pifo and San Antonio quarries has been studied. It explores the impact of incorporating nano-silica in varying proportions (0.75%, 1.00%, 1.25%) on mortar properties, contrasting them with conventional and prefabricated mortars. laboratory Testing is conducted according to standards to assess both fresh and hardened state properties, and microscopic analysis reveals the optimal nano-silica proportion’s effects on mortar characteristics. Results shows that Incorporating 0.75% nano-silica resulted in a 61% increase in compressive strength at 7 days and. For a nanosilica content of 1.25%, a 14% increase in compressive strength was observed at 28 days in relation to the conventional mortar and the permeability of the mortar decreased by 30% when adding 0.75% nanosilica. It discusses economic viability and provides insights through SEM and EDS analyses. Overall, it underscores nano-silica’s potential to enhance mortar properties and its relevance in creating more efficient and durable construction materials.
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Dinámicas temporales y espaciales en la reconstrucción post-desastre
(Universidad ORT Uruguay, 2024-10-28)
ROCCHIO, DANIELE
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Débora Domingo-Calabuig
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KHORAMI, MAJID
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Sebastian Narvaez-Purtschert
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Adrián Patricio Beltrán Montalvo
Este estudio explora la compleja interacción entre tiempo y espacio en el contexto de la reconstrucción post-desastre e introduce una perspectiva novedosa que trasciende las concepciones estáticas tradicionales asociadas con la arquitectura y la planificación urbana. A través de un análisis multiescala que integra dimensiones temporales (memoria, observación y proyección) con escalas espaciales que van desde edificaciones individuales hasta el tejido urbano más amplio, los resultados muestran que la reconstrucción no es meramente un proceso de reconstrucción física, sino también un acto de resignificar y reinterpretar el tiempo y el espacio. Se introduce el concepto de “tiempo cero” como un momento de estasis que precede a la reconstrucción, mientras que el “movimiento” se analiza como una metáfora del viaje hacia una renovada armonía espacial y social. Este artículo destaca la influencia mutua entre las prácticas de reconstrucción y las percepciones temporales y espaciales de los individuos, y sugiere enfoques de planificación que valoran la temporalidad y la flexibilidad espacial. Contribuyendo al debate sobre la resiliencia urbana, esta investigación ofrece perspectivas para enfoques de reconstrucción post-desastre sostenibles, inclusivos y arraigados en la comunidad.
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A treatment wetland park assessment model for evaluating urban ecosystem stability using analytical hierarchy process (AHP)
(2019)
Arezou Shafaghat
;
Ooi Jin Ying
;
Ali Keyvanfar
;
Amir Jamshidnezhad
;
M. Salim Ferwati
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Seismic performance evaluation of buckling restrained braced frames (BRBF) using incremental nonlinear dynamic analysis method (IDA)
(2017)
KHORAMI, MAJID
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Alvansazyazdi, M.
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Shariati, M.
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Jalali, A.
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Tahir, M.M.
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Evaluation of the seismic performance of special moment frames using incremental nonlinear dynamic analysis
(2017)
KHORAMI, MAJID
;
Masoud Khorami
;
Hedayatollah Motahar
;
Mohammadfarid Alvansazyazdi
;
Mahdi Shariati

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