ESTiG - Artigos em Proceedings Não Indexados à WoS/Scopus
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Percorrer ESTiG - Artigos em Proceedings Não Indexados à WoS/Scopus por Objetivos de Desenvolvimento Sustentável (ODS) "08:Trabalho Digno e Crescimento Económico"
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- An experimental analysis on the thermal performance of rammed earth wallsPublication . Luso, Eduarda; Cabello, Isabel; Silva, Rui A.; Briga-Sá, AnaEarth has been used as a building material since the beginning of civilizations and its utilization was widespread to most regions of the world, promoted by the high availability, easy access and low cost of the material. As result of the generalised use of raw earth as building material, many earthen building techniques were developed through time, where adobe masonry, rammed earth and wattle-and-daub are among the most important. Currently, it is estimated that one quarter of the world's population lives in buildings made of earth. However, during the last century, earthen materials fell into disuse in several developed countries with the popularization of concrete, steel and fire bricks. Nevertheless, earthen architecture has been receiving increasing attention in the last few decades, driven by its green building potential and by other features of earthen materials, which includes, among others, unique aesthetics and hygrothermal regulation capacity. Several studies have been developed to characterize earthen solutions concerning physical and mechanical properties. However, regarding the thermal behaviour, it is known that the thermal conductivity of rammed earth is a parameter that depends on the characteristics of the soil (particle size distribution, mineralogy, etc.) and moisture content. Thus, given the soils variability, it becomes clear that further investigation should be addressed to characterize the thermal performance of rammed earth solutions, contributing to define more accurate thermal conductivity values for the design of rammed earth buildings. On this regard, this paper presents an experimental study that aims to characterize the thermal behaviour of rammed earth built with different soils and with different thicknesses. A continuous measurement allowed to obtain heat fluxes, inner surface temperatures and the thermal transmission coefficient of the tested rammed earth walls solutions. The results obtained so far confirmed that the type of soil and thickness significantly influences the thermal behaviour of the earthen material. It was also observed that the thermal transmission coefficient of a 50 cm thick wall is about 30% lower than the one verified for the wall with 35 cm, built with the same soil.
- Defining industrial tourism in the cross-border region of Portugal and SpainPublication . Scalabrini, Elaine C.B.; Alves, Francisco; Neto, Reginaldo; Teixeira, F.; García, Joaquin; Velasco, M.; Teixeira, João Paulo; Vaz, Roberto; Fernandes, Paula OdeteThis paper deals with the definition and valorisation of industrial and pre-industrial tourism in the cross-border region of Terras de Trás-os-Montes (Portugal) and Castilla y León (Spain). Industrial and pre-industrial heritage is crucial to collective memory and has significant cultural, historical and tourist value. Industrial tourism is emerging as an initiative that enhances historic landscapes and contributes to urban development, the revitalisation of communities and the preservation of heritage. It is considered an innovative strategy for rehabilitating territories, transforming old facilities into attractions, exploring historic sites or operating companies. The “IN_GENIOS_DUERO_DOURO” project focused on promoting this heritage in the Douro-Duero Euroregion. The methodology included detailed mapping and characterisation, creating a database with 1,079 sites identified in 22 Portuguese and 80 Spanish municipalities. The results show that most sites are in Spain (77.1 %). The municipalities with the most identified sites are Valladolid (250) in Spain and Mirandela (32) in Portugal. The main heritage categories include transport infrastructure (335), wineries (255) and the food industry (221). Around 47.27 per cent of the sites identified are accessible to tourists. The database created is fundamental for valuing, safeguarding and designing tourist routes.
- Do Spanish and Portuguese listed companies converge in their choice of capital structure?Publication . Rogão, Márcia; Serrasqueiro, Zélia; .In order to study the behaviour of capital structure decisions of Spanish and Portuguese listed firms, we using as methodology the dynamic estimators to analyse the influence of firm- specific and country-specific determinants. The sample in this study is composed with 67 Spanish listed non-financial Spanish listed firms and 35 Portuguese listed non-financial firms, for the period of analysis between 2008 and 2016. The results obtained indicate that capital structure decisions of Portuguese and Spanish listed companies converge in terms of transaction costs, however, in greater magnitude for Portuguese companies, since th coefficient of adjustment of current debt towards the optimal level of leverage varies between 0.662 and 0.695 for Spanish firms and between 0.674 and 0.834 for Portuguese firms. The results also indicate a convergence in the behaviour of Spanish and Portuguese firms' financing decisions in the context of agency costs, as the results indicate the existence of a significant positive relationship between the tangibility of firms' assets. Similarly, this convergence is also evident for the determinants of information asymmetry problems, with profitability and liquidity variables negatively influencing Spanish and Portuguese firms' leverage. However, only the financing decisions of Spanish firms are influenced by market conditions and stock market development.
- Study, design, and manufacturing of 3D-printed orthosesPublication . Nogueira, B.; Rocha, JoãoThis study demonstrated that, in relation to Additive Manufacturing, Three-Dimensional (3D) Printing is a technology that is increasingly present in everyday life in the manufacturing of parts. In this case, the piece manufactured using 3D printing was a hand orthosis, intended to alleviate the pain of a woman suffering from a medical condition. This study highlights the growing presence of three-dimensional (3D) printing in everyday life, particularly in the manufacture of customized medical devices. In the field of additive manufacturing (AM), Material Extrusion (MEX), ISO/ASTM 52900:2023, (fused deposition modeling (FDM)) has become a widely used technique due to its affordability, accessibility, and ability to create personalized solutions. In this case, a 3D-printed hand orthosis was designed to assist a woman suffering from tendinitis in her thumb. The orthosis was designed to reduce pain and provide support to improve her daily functionality. Material Extrusion (MEX), FDM technology was used to build the device layer by layer, resulting in a lightweight yet durable structure tailored to the patient's needs. One of the key benefits of 3D printing in orthotic design is the ability to create customized, patient-specific solutions at a lower cost than traditional manufacturing. In addition, rapid prototyping allows for quick modifications based on patient feedback, improving comfort and effectiveness. Traditional orthotic manufacturing methods require expensive molds and labor-intensive processes, whereas 3D printing streamlines production, allowing for efficient, scalable, and precise results. Another advantage of this technique is the wide range of materials available for use in 3D printing. From biodegradable polymers to highly durable composites, the choice of material can be tailored to the specific needs of each patient, ensuring not only comfort but also long-term durability. For example, in this case, PLA was used, a material known for its low cost, ease of printing, and environmental sustainability. This study reinforces the potential of 3D printing in medical applications and demonstrates how FDM-printed orthotics can help alleviate pain and improve quality of life for people with musculoskeletal conditions. As the technology continues to evolve, personalized healthcare solutions will become more accessible and efficient. The implications of this advancement extend beyond orthotic production, opening possibilities for broader applications in medical fields, including prosthetics, implants, and even tissue engineering.