CIMO - Publicações em Proceedings Indexadas à WoS/Scopus
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Percorrer CIMO - Publicações em Proceedings Indexadas à WoS/Scopus por Objetivos de Desenvolvimento Sustentável (ODS) "09:Indústria, Inovação e Infraestruturas"
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- Chemical evaluation of agro-industrial wastes for composting water hyacinthPublication . Oliveira, Verónica; Rodrigues, Manuel Ângelo; Arrobas, Margarida; Rodrigues, Edite; Simões, P.; Miguens, Filomena; Santos, DanielaWater hyacinth (WH) waste removed from watercourses can be valued through composting. In this study it was determined the elemental composition of WH waste and other local organic residues to prepare suitable mixtures for composting. Rice husk, straw and woodchip showed high C/N ratios (> 80). In turn, farmyard manures and vegetables displayed low C/N ratios (< 20). WH tissues showed increased C/N ratios with the aging process (from 17.4 to 37.1). WH tissues had low P (< 2 g kg-1) and high Fe (>5000 mg kg-1) and Mn (2476.7-- 12885.8 mg kg-1) concentrations. Fe and Mn levels were particularly high in the roots (31706.8 and 38335.2 mg kg-1, respectively). Such high levels of Mn and Fe may impair the composting process and restrict the agricultural use of compost. Thus, the composting piles must be prepared from an optimized combination of organic materials that avoids either of those problems.
- Development of Polyethersulphone Mixed Matrix Zeolite Membranes Functionalized with Ionic Liquids and Deep Eutectic Solvents for CO2 SeparationPublication . Cardoso, Jonathan; Lin, Zhi; Brito, Paulo; Ferreira, LicínioMixed matrix membranes (MMM) combine the flexibility of polymers and the strength and durability presented by inorganic solids. In an economically point of view, the advantages of membrane separation are low capital investment and space requirements, high process flexibility and lower energy consumption, helping for a more cost-effective separation process and providing a high separation degree. The molecular sieves based on nano-sized silicoaluminophosphates (SAPO) appear as one of the main materials in MMM for gas separation because the pore size of chabazite (CHA) (0.38 nm) is near the kinetic diameter of gases like H2 (0.29 nm), CO2 (0.33 nm), N2 (0.36 nm), CO (0.37 nm), CH4 (0.38 nm) and reduced crystal size improves the dispersion and decreases interfacial defects. Doping SAPO-34 are intended to increase the potential of these solids. The use of isomorphic substitution by transition metals (Fe, Ni, Co, Mn), results in materials with different acidity that differ from the original SAPO in interactions with other compounds. Besides, the addition of ionic liquids (IL) or Deep Eutectic Solvents (DES) with high affinity and selectivity to CO2, onto the particle surface and then dispersing it in a polymer membrane can enhance the separation characteristics, resulting in better permeation and selectivity properties.
- Enhancing Thermal Fiducial Marker Detection: Focus on Image Processing TechniquesPublication . França, Andre; Berger, Guido S.; Mendes, André; Lima, JoséThis article proposes methods for maximising the detection rates of thermal fiducial markers using thermography. By exploring the combination of image processing techniques with the use of an affordable thermographic camera, the aim is to mitigate the negative effects of thermography and improve accurate marker identification in a variety of mounting and distance conditions. The research identified a diversity of processing techniques capable of improving thermal marker recognition, offering the potential to surpass previous results. The results highlight the possibility of using low-cost thermographic cameras for this purpose, which could democratise and reduce the costs of recognition processes. This methodology validates the proposed approach, providing a robust basis for future improvements in thermal marker detection and promoting the feasibility of practical, low-cost applications in an assortment of fields.
- Influence of Time and Temperature Variables on the Heat Treatment of an AL-MG SI AlloyPublication . Ribeiro, J.E.; Lopes, Hernani; Rocha, JoãoThis study investigates the effect of time and temperature on the heat treatment of 6082 Al-Mg-Si alloy. Solubilization, quenching, and artificial aging were performed under parameter combinations defined using the Taguchi method. Mechanical testing supported the development of a multiple linear regression model, which identified aging temperature as the most significant factor influencing ultimate tensile strength and yield strength. High aging temperatures promoted coarse precipitate formation and reduced strength, while lower temperatures minimized this effect and maintained or improved mechanical performance. The results demonstrate the potential of combining statistical design with predictive modeling to optimize heat treatment parameters and enhance alloy performance for industrial applications.
- Mechanical Characterization of Eco-Friendly Composites: Green Epoxy Resin Reinforced with Coir FibersPublication . Ribeiro, J.E.; Lopes, Hernani; Rocha, JoãoThe increasing demand for sustainable materials has fostered the development of natural fiber-reinforced composites as eco-friendly alternatives to petroleum-based systems. This work investigates the mechanical performance of GreenPoxy resin reinforced with coir fibers through a comprehensive experimental program. Fiber properties were first characterized by density and tensile tests, while the resin was evaluated under tensile and flexural loading. Composite laminates were then fabricated by hand lay-up using 3% and 6% fiber volume fractions, with both untreated and retted fibers. Mechanical behavior was analyzed using Taguchi design and ANOVA to assess the effects of fiber treatment and content. Untreated fibers displayed slightly higher intrinsic strength, while mercerization enhanced fiber–matrix adhesion, particularly at higher fractions. The composites exhibited promising properties, confirming the potential of coir/GreenPoxy systems for sustainable structural applications.
- Post-treatment Modification Using Deep Eutectic Solvent in PES and PES/ SAPO-34 Membranes for Gas SeparationPublication . Cardoso, Jonathan; Lin, Zhi; Brito, Paulo; Ferreira, LicínioMixed matrix membranes (MMM) are heavily studied and the main concern by researchers is the difficulty to obtain a high selectivity membrane with low defects, mainly interfacial voids due to the poor interaction between polymer matrix and filler. The functionalization of zeolite surface in PolyEtherSulphone (PES)/ Silico-AluminoPhosphate-34 (SAPO-34) led to membranes with higher compati-bility. Recently, the use of ionic liquids in the particles surface to improve the gas permeability and separation efficiency has presented advanced results. Although, the cost and environmental issues on Ionic Liquids (ILs) still represent a limit to its use. The Deep Eutectic Solvents (DESs) present an alternative route to replace ILs, with low-cost and environmentally friend. This paper aims to study the potential use of choline chloride/urea, a DES mixture, in ratio 1:2, to replace ILs as a post-healing methodology, showing a 20% increase in CO2 permeability in PES membranes and 15% increase in CO2/N2 selectivity in PES/SAPO-34 membranes due to an increase in compatibility between polymer and zeolite promoted by the post-treatment using DES.
- Use of data from the advanced spaceborne thermal emission and reflection radiometer (ASTER) for the study of the urban heat island (UHI) in Bragança (Portugal) (2000-2023)Publication . Almeida, Cátia Rodrigues de; Alírio, João; Gonçalves, Artur; Teodoro, Ana Cláudia M.The Urban Heat Island (UHI) effect refers to the temperature difference between urban and surrounding rural areas, with higher temperatures in urban areas, especially after sunset. The Surface Urban Heat Island (SUHI), a proxy for UHI, can be evaluated using Remote Sensing (RS) data by calculating the Land Surface Temperature (LST). Bragança (Portugal) has an in situ network, with 23 sensors installed in 2011, classified into seven different Local Climate Zones (LCZs), to measure Air Temperature (Tair). The primary objectives of this study were to: i) calculate the LST using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data available on Google Earth Engine (GEE) from 2000-2023 at these 23 points, divided into spring/summer (a); and autumn/winter (b); ii) calculate and analyze the Intensity of SUHI (SUHIint) (2000-2023), using LST, based on the temperature difference recorded at each sensor compared to the average temperature at the Rural Areas (RCD) sensors, and evaluate the thermal behavior in the LCZs; iii) calculate the UHI (UHIint), using Tair data; and iv) correlate SUHIint and UHIint (2011-2023). As a result, 17 images from (a) and four from (b) were processed, and the highest LST medians were associated with classes featuring anthropogenic elements in both, with (a) being more heterogeneous. Comparisons between SUHIint and UHIint, were obtained in 13 days, only from (a). The highest median temperature values were in anthropogenic classes. The correlation between SUHIint and UHIint was "strong" (74%) and "very strong" (26%), confirming their similarity in thermal behaviour.
- Valorization of water hyacinth waste through compostingPublication . Oliveira, Veronica; Rodrigues, Manuel Ângelo; Arrobas, Margarida; Rodrigues, Edite; Simões, P.; Pato, Rosinda; Miguens, Filomena; Santos, DanielaWater hyacinth composts can be used in agriculture to improve soil fertility and crop yield, reducing the dependence on synthetic fertilizers. This study aimed to monitor physicochemical parameters of the composting of water hyacinth waste blended with other organic wastes. Two composting piles were assembled using different organic materials: water hyacinth waste, potato residue, olive pomace and dairy cow manure (pile 1) or rice straw (pile 2). Composting pile 1 ran for 251 days and pile 2 lasted 244 days. Both piles registered temperatures above 55 oC for several weeks, whereas moisture and pH values were found within adequate intervals, ensuring good conditions for sanitation and microbial activity. The C/N ratio decreased during the composting period, stabilizing in values close to those that are commonly referred as adequate (12.6, pile 1; 10.9, pile 2). Measured quality parameters indicate that the final organic compost is very suitable for agricultural use.