CIMO - Publicações em Proceedings Indexadas à WoS/Scopus
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- Analysis of land use land cover changes and their impacts on the urban heat island effect in Bragança, PortugalPublication . Almeida, Cátia Rodrigues de; Alírio, João; Gonçalves, Artur; Teodoro, Ana CláudiaThe viability of urban life requires a series of changes in Land Use Land Cover (LULC), incorporating anthropic elements at the expense of vegetated areas, changing the land cover, which affects surface albedo. One of the impacts could be the formation of an Urban Heat Island (UHI), where temperatures are higher in cities compared to the vegetated surrounding areas, especially after sunset. Remote Sensing (RS) data, such as Land Surface Temperature (LST), image classification algorithms, and vegetation indices, can be used to understand this dynamic. This research aimed to assess the sensitivity of RS products to LULC changes and evaluate the surface thermal behaviour of (Portugal) between 2016 and 2023, during summer and winter. RS was able to identify some changes in LULC and ascertain that LST, in general, was higher in anthropic areas, especially during the summer.
- 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.
- An Efficient Feature Extraction Method for Identifying Signatures of Viral Genomic VariantsPublication . Souza, Felipe Bueno de; Pimenta-Zanon, Matheus Henrique; Henriques, Dora; Pinto, M. Alice; Balsa, Carlos; Rufino, José; Lopes, Fabrício MartinsGenomic analysis is a powerful way to understand viral pathogens and their variations. However, most of the genomic analysis methods are based on sequence alignment, which has a high computational cost. This study introduces a novel methodology to extract discriminative regions from viral genomes. Using exclusive k-mers through strategically defined sliding windows, our approach identifies genomic regions with high concentrations of variant-specific signatures, showcasing high-accuracy classification while requiring modest computational resources. The data-driven and nonparametric nature of our approach enables pattern extraction without imposing predefined distributions, enhancing both analytical flexibility and result interpretability. By balancing minimal k-mer sizes with maximum discriminative power, our method achieves remarkable generalization capability even with limited training samples. The computational efficiency of the methodology alongside the biological transparency and explainability in the results makes it accessible to research environments with restricted processing capacity, potentially accelerating genomic signature discovery across diverse viral pathogens and contributing to better variant tracking and characterization, thus opening up even more possibilities in genomic analysis studies.
- 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.
- 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.
- Reactive Materials and Solutions Towards Treatment and Reuse of Waters with Contaminants of Emerging ConcernPublication . Silva, Adriano S.; Roman, Fernanda F.; Silva, Ana P. F.; Díaz de Tuesta, Jose Luis; Kalmakhanova, Marzhan; Snow, D.; Gomes, Helder T.Intense population growth has significantly impacted the quality and access to water, resulting in increased production and release of contaminants of emerging concern (CECs), such as pharmaceutical compounds. Catalytic wet peroxide oxidation (CWPO) is a promising technology for the removal of CECs that relies on the use of solid catalysts to accelerate the reaction, its reactivity and stability depending greatly on the catalyst used. This work aims to compare three typically studied catalysts: a clay-based, a carbon-based and a hybrid material, consisting in carbon-shell metal nanoparticle structure. Hybrid catalysts combine the benefits of metal-based catalysts (high activity) and carbon-based catalysts (low leaching), indicating to be a suitable choice. However, it is highlighted that the development of proper soludons for treatment and reuse of waters must pass through detailed identification and quantification of CECs, allowing better catalyst evaluations under real scenario conditions.
- 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.