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828 results on '"Castro, Sergio A."'

23. Gobernanza electrónica e inclusión digital de personas mayores mediante estrategias de alfabetización digital e informacional en la localidad de Placilla, Valparaíso, Chile

Author

Valenzuela Urra, Cristian, Rodríguez Pastene, Fabiana, and Oliveros Castro, Sergio

Subjects
C. Users, literacy and reading., I. Information treatment for information services, L. Information technology and library technology
Abstract

This article addresses the problem of digital and information literacy, relating it to the relevance of electronic governance and the impact it has on the elderly. For this, a qualitative-descriptive approach was used to analyze the data on the impact of theprogram. As an instrument of analysis, the notion and method of personal agency was chosen, which gives priority to freedom, the fulfillment of goals and the development of transcendent personal values for the individual. Among the main results obtained, theachievements made by older people in self-efficacy, self-determination, control of their behavior, recognition of their learning andempowerment stand out. Among the main conclusions, it is highlighted that through a program focused on the elderly, the digitalgap is reduced, highlighting the importance of autonomy and independence with respect to their environment, self-learning andlearning by doing, as fundamental skills for today ́s society.

Published
2022

26. Minimally Invasive Assessment of Peripheral Residual Disease During Maintenance or Observation in Transplant-Eligible Patients With Multiple Myeloma.

Author

Lasa, Marta, Notarfranchi, Laura, Agullo, Cristina, Gonzalez, Carmen, Castro, Sergio, Perez, Jose J., Burgos, Leire, Guerrero, Camila, Calasanz, Maria Jose, Flores-Montero, Juan, Oriol, Albert, Bargay, Joan, Rios, Rafael, Cabañas, Valentin, Cabrera, Carmen, Martinez-Martinez, Rafael, Encinas, Cristina, De Arriba, Felipe, Hernandez, Miguel-Teodoro, and Palomera, Luis

Published
2025
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27. Removal of Nitrogen, Phosphates, and Chemical Oxygen Demand from Community Wastewater by Using Treatment Wetlands Planted with Ornamental Plants in Different Mineral Filter Media.

Author

Marín-Muñiz, José Luis, Ortega-Pineda, Gonzalo, Zitácuaro-Contreras, Irma, Vidal-Álvarez, Monserrat, Martínez-Aguilar, Karina E., Álvarez-Hernández, Luis M., and Zamora-Castro, Sergio

Subjects
ORNAMENTAL plants, POROUS materials, NITROGEN removal (Sewage purification), CHEMICAL oxygen demand, WETLAND plants
Abstract

This study aimed to explore the impact of various ornamental plants (Heliconia psittacorum, Etlingera elatior, Spatyphilum walisii) grown in different filter media (porous river rock (PR) and tepezyl (TZ)) on the removal of pollutants in vertical-subsurface-microcosm treatment wetlands (TWs). This study also sought to assess the adaptability of these plant species to TW conditions. Twenty-four microcosm systems were utilized, with twelve containing PR and twelve containing TZ as the filter media. Each porous media type had three units planted with each species, and three were left unplanted. Rural community wastewater was treated in the TWs. The results showed no significant differences in the effects of the porous media on pollutant removal performance (p > 0.05). However, it was noted that while both porous media were efficient, TZ, a residue of construction materials, is recommended for sites facing economic constraints. Additionally, the removal efficiency was found to be independent of the type of ornamental plant used (p > 0.05); however, the measured parameters varied with plant spp. The adaptation of the plants varied depending on the species. H. psittacorum grew faster and produced a larger number of flowers compared to the other species (20–22 cm). S. wallisii typically produced 7–8 flowers. E. elatior did not produce flowers, and some plants showed signs of slight disease and pests, with the leaves turning yellow. In terms of plant biomass, the type of porous media used did not have a significant effect on the production of above (p = 0.111) or below-ground biomass (p = 0.092). The removal percentages for COD in the presence and absence of plants were in the ranges of 64–77% and 27–27.7%, respectively. For TN, the numbers were 52–65% and 30–31.8%, and for N-NO3, they were 54–60% and 12–18%. N-NH4 saw removal rates of 67–71% and 28–33%, while P-PO4 saw removal rates of 60–72% and 22–25%. The difference in removal percentages between microcosms with and without plants ranged from 30 to 50%, underscoring the importance of plants in the bio-removal processes (phytoremediation). These results reveal that incorporating ornamental plants in TWs with TZ for wastewater in rural areas holds great promise for enhancing the visual appeal of these systems and ultimately gaining public approval. Our findings also enable us to offer recommendations for selecting suitable plants and substrates, as well as designing combinations for TWs. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Durability of Steel-Reinforced Concrete Structures Under Effect of Climatic Temporality and Aggressive Agents (CO 2 , SO 2) in Boca del Rio, Veracruz.

Author

González-Moreno, Humberto Raymundo, Marín-Muñiz, Jose Luis, López-Gonzalez, Pablo Julian, Moreno-Vazquez, Oscar, Zamora-Castro, Sergio Aurelio, Monzón-Reyes, Brenda Lizeth, and Sangabriel-Lomeli, Joaquin

Subjects
GREEN infrastructure, SILICA fume, CLIMATE change, COMPRESSIVE strength, CARBON dioxide
Abstract

The development of sustainable infrastructure is essential to address the challenges of climate change and reduce CO2 emissions. The use of alternative materials, such as agro-industrial ashes and silica fume, emerges as a promising option to enhance the durability of concrete and diminish its environmental impact. These materials can partially replace conventional cement, contributing to the construction of more sustainable infrastructure without compromising performance, even under adverse environmental conditions. In this study, we present an analysis of the use of sugarcane bagasse ash (SBA) and silica fume (SF) as a 15% cement replacement. The behavior of these materials was investigated under coastal conditions, analyzing climatic variables and degrading gases such as CO2, CH4, and N2O. Electrochemical techniques were employed to measure corrosion rate and potential, in addition to conducting carbonation and compressive strength tests. The mixtures with a 15% addition of SBA and SF showed improvements compared to conventional mixes. SBA reduced the corrosion rate by 25% and increased compressive strength by 12% after 150 days, while SF enhanced carbonation resistance by 20% and compressive strength by 25%. The incorporation of SBA and SF provides significant durability in coastal environments, contributing to the sustainability of infrastructure exposed to adverse weather conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Ornamental Plant Growth in Different Culture Conditions and Fluoride and Chloride Removals with Constructed Wetlands.

Author

Marín-Muñiz, José Luis, Hernández, María E., and Zamora Castro, Sergio

Subjects
ORNAMENTAL plants, CONSTRUCTED wetlands, ALPINIA, AQUATIC animals, POLLUTANTS
Abstract

Natural water resources often contain fluorides and chlorides due to wastewater discharge; however, excessive exposure to fluorides can pose health risks to humans. Elevated chloride levels can negatively affect aquatic fauna and disrupt the reproductive rates of plants. This study assessed constructed wetlands (CWs) featuring monocultures (including Canna hybrid, Alpinia purpurata, and Hedychium coronarium) and polycultures (combinations of species from the monoculture systems) of ornamental plants (OPs) to evaluate their efficiency in removing fluorides and chlorides. The results revealed that the ornamental plants flourished in the CW conditions without sustaining any physical damage. C. hybrid demonstrated the longest roots and the highest volume, as well as greater height compared to other species. However, this did not affect the ion removal efficiency. In polyculture systems, 42.2 ± 8.8% of fluoride was removed, a result that was not significantly different (p > 0.05) from the removal rates observed in monocultures of C. hybrid (42.5 ± 7.5%), H. coronarium (36.8 ± 7.0%), or A. purpurata (30.7 ± 7.9%). For chloride, a similar pattern emerged, with 32.4 ± 4.8% removed in constructed wetlands (CWs) using a polyculture of ornamental plants, a figure that was also not significantly different (p > 0.05) from the removal percentages in monocultures of C. hybrid (29.1 ± 5.3%), H. coronarium (28.1 ± 5.0%), or A. purpurata (32.0 ± 5.7%). Our results indicate that CWs with polyculture species contribute to pollutant removal at levels comparable to those found in monoculture systems. However, polyculture systems offer enhanced aesthetic appeal and biodiversity, incorporating various ornamental flowering plants. The use of this eco-technology for removing fluoride and chloride pollutants helps prevent river contamination and associated health issues. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Energetic analysis of the liquid–liquid equilibrium of systems containing polyethylene glycol (4000 g.mol−1 or 6000 g.mol−1) and salts (Na2SO4 or Na3C6H5O7) at different temperatures and their application in the bovine serum albumin and α-lactalbumin partitioning

Author

Reinert Ramos Gandolfi, Olga, de Sousa Castro, Sérgio, Ramos Ferreira Gonçalves, Gabriel, de Carvalho Batista Muniz, Izabella, da Costa Ilhéu Fontan, Rafael, Martins Veloso, Cristiane, and Cristina Ferreira Bonomo, Renata

Published
2022
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35. Liquid-liquid equilibrium data for systems formed by PEG (4000 or 6000) or alcohol (1-propanol or 2-propanol) + potassium phosphate + water: Experimental measurements, correlations and thermodynamic modeling

Author

Muniz, Izabella de Carvalho Batista, Castro, Sérgio de Sousa, Gandolfi, Olga Reinert Ramos, dos Santos, Karine Amaral, Santos, Beatriz Silva, Souza Junior, Evaldo Cardozo, Fontan, Rafael da Costa Ilhéu, Veloso, Cristiane Martins, and Bonomo, Renata Cristina Ferreira

Published
2021
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48. Barreras y facilitadores para el diagnóstico y tratamiento de la depresión en atención primaria en Colombia: Perspectivas de los proveedores, administradores de atención médica, pacientes y representantes de la comunidad

Author

Bartels, Sophia M., Cardenas, Paula, Uribe-Restrepo, José M., Cubillos, Leonardo, Torrey, William C., Castro, Sergio M., Williams, Makeda J., Oviedo-Manrique, Diana Goretty, Gómez-Restrepo, Carlos, and Marsch, Lisa A.

Published
2021
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