ESTiG - Resumos em Proceedings Não Indexados à WoS/Scopus
URI permanente para esta coleção:
Navegar
Percorrer ESTiG - Resumos em Proceedings Não Indexados à WoS/Scopus por Domínios Científicos e Tecnológicos (FOS) "Engenharia e Tecnologia"
A mostrar 1 - 10 de 26
Resultados por página
Opções de ordenação
- Acceptance and familiarization with wearable devices in Portugal and BrazilPublication . Lopes, Isabel Maria; Rocha, João; Oliveira, PedroThis research sought to understand the acceptance of wearable devices in Portugal and Brazil, analyzing aspects such as demographic profiles, experiences with technology and personal perceptions. An adaptation of the UTAUT2 model was made, obtaining responses from university students and frequent internet users through a questionnaire that used the Likert scale. The evaluation of the data indicated a predominance of participants from Portugal, a tendency for acceptance to be more pronounced among younger people, those with a higher level of education and a greater technological proficiency among men and more qualified individuals. The relationship between users and non-users of wearable devices proved to be balanced, with a more marked acceptance by people aged 35 to 59, women and those who have a positive view of technology. The Smartwatch stood out among the devices, followed by the Fitness Bracelet and the Smart Ring. A variation in social influence was observed according to the type of device, being more striking in the case of Smartwatches. Surprisingly, social influence did not prove to be as crucial in the acceptance of wearable devices as initially thought. The findings show a trend towards the adoption of these devices, while also warning of challenges linked to the perceived value and price of products, signaling an area with great potential for future research and innovation.
- Accurate 3D numerical models for the fire performance on lsf partition walls under different fire scenariosPublication . Piloto, Paulo A.G.; Silva, Renata; Frizzera, Giovanna; Torres, Leonardo; Couto, Carlos; Vila Real, Paulo; Mesquita, Luís M.R.; Lopes, NunoThis study presents the development and validation of advanced 3D numerical models to analyse the fire performance of non-load-bearing Light Steel Frame (LSF) partition walls under different fire scenarios, specifically the standard ISO 834 and HYDROCARBON fire. Medium-scale experimental fire resistance tests from prior research were used for validation, focusing on LSF walls with and without cavity insulation (external composite insulation). Three computational solution methods were compared and used to predict the fire behaviour of LSF walls with a void cavity. The finite element method was employed for transient thermal analysis with temperature-dependent material properties, including adaptations to simulate material degradation such as gypsum board cracking and rock wool melting under HYDROCARBON fire conditions. Hydrocarbon fires reduced fire resistance by an average of 57% compared to ISO 834 fires for cavity-insulated walls, whereas external insulation configurations showed less reduction.
- Acorn pre-drying: implications for the food industryPublication . Farrero, Bernardo; Ribeiro, Luís Frölén; Famiglietti, Antonio; Babo, PedroIn industry, 74% of the energy consumed is used in the form of heat. The food sector is characterised by a high share of processes that rely on industrial heat [1]. However, 90% of this thermal energy currently comes from fossil fuels, and only 9% is supplied by renewable sources [2]. The adoption of solar thermal technologies in the food industry offers multiple benefits that support its viability as an energy alternative to overcome this caveat. Firstly, by relying on a renewable and stable source. Manufacturers can reduce production costs and limit their exposure to the volatility of fossil fuel prices, thereby ensuring greater long-term price stability and predictability [3]. These reductions in energy costs may also be reflected in lower prices for the end consumer. Solar-assisted dehydration enables a decrease in moisture content, thereby limiting microbial growth and food spoilage [3]. In this regard, Solar Heat for Industrial Processes (SHIP) may also address food security concerns as storage losses are estimated to reach up to 20%, posing a critical challenge to food security [4]. The installation of in-situ pre-dehydration systems near harvesting zones provides clear benefits for energy efficiency and product quality. The Iberian Peninsula, notably, benefits from very high solar radiation, with many clear-sky days and extended sunlight periods, making it particularly suitable for solar-based pre-dehydration systems. By lowering produce weight and moisture before transportation, these systems decrease fossil energy demand during both industrial drying and large-scale transport [5]. This approach reduces the final product cost, as demonstrated by an in-situ solar dryer used for acorns in Alentejo holm oak groves. The passive, indirect mobile dryer, fitted with hanging bags, reduces acorn moisture content by 15% after 72 hours of drying, delays fruit spoilage, and cuts large-scale industrial heat input [6,4]. Thermal energy data from a factory case at Landratech, an acorn food producer involved in the MEDACORNET project, indicate that 15% in-situ pre-dehydration cuts thermal energy use by 52% during both initial and final drying stages of acorn flour manufacture [3]. This combined method lowers fossil fuel use, reduces losses, improves energy efficiency, and supports sustainability in the food processing sector.
- Adoption of wearables: a UTAUT2 perspectivePublication . Lopes, Isabel Lopes; Oliveira, PedroThis research sought to understand the adoption of Wearable devices, analyzing aspects such as demographic profiles, experiences with technology and personal perceptions. An adaptation of the UTAUT2 model was made, obtaining responses from university students and frequent internet users through a survey using the Likert scale questions was administered to 96 participants. Based on the analysis, there was a tendency for higher acceptance among younger people, those with higher levels of education and greater technological proficiency among men and more qualified individuals. The Smartwatch stood out among the devices, followed by the Fitness Bracelet and the Smart Ring. A variation in social influence was observed according to the type of apparatus. Unexpectedly, social influence has not proven to be as crucial in the acceptance of wearable devices as initially thought. The results show a trend towards the adoption of these devices, while also warning of challenges linked to the perceived value and price of products.
- Almond and walnut shells as sustainable soil amendments: physical insights for geotechnical applicationsPublication . Nouioua, Thamer; Marchiori, Leonardo; Silva, Flora; Albuquerque, António; Cavaleiro, VictorThe use of agricultural waste as soil amendments aligns with global efforts to promote sustainable development and circular economy principles. This study investigates the potential of almond and walnut shells as ecofriendly soil amendments, focusing on their physical and mechanical characteristics, including density, plasticity, compaction, and consolidation behavior. By incorporating these biodegradable by-products into soil systems, the research seeks to evaluate their chemical compatibility with natural soils and their suitability for enhancing geotechnical performance. Laboratory analyses were conducted to determine the shells' specific gravity, Atterberg limits, Proctor compaction parameters (optimum moisture content and maximum dry density), and oedometric consolidation properties under various stress conditions. Results indicate that almond and walnut shells exhibit very low density, making them suitable for reducing soil weight in specific applications. Additionally, their favorable compaction and plasticity characteristics contribute to improved soil workability. Consolidation tests reveal that these amendments enhance the compressibility and permeability of treated soils, suggesting potential applications in agricultural and environmental engineering contexts. The findings highlight the dual benefits of reducing agricultural waste disposal and improving soil properties, contributing to the United Nations’ Sustainable Development Goals. By showcasing the viability of almond and walnut shells as sustainable soil amendments, this study provides a novel approach to integrating agricultural by-products into geotechnical engineering practices, supporting both environmental protection and infrastructure resilience.
- Assessing the reliability of AI-based angle detection for shoulder and elbow rehabilitationPublication . Klein, Luan; Chellal, Arezki Abderrahim; Grilo, Vinicius; Gonçalves, José; Pacheco, Maria F.; Fernandes, Florbela P.; Monteiro, Fernando C.; Lima, JoséAngle assessment is crucial in rehabilitation and significantly influences physiotherapistsŠ decisionmaking. Although visual inspection is commonly used, it is known to be approximate. This preliminary study aims to integrate and evaluate AI image-based approaches for assessing upper-limb angles. The study involved 28 participants performing four different rotational joints movement in the shoulder and elbow complex. Two AI algorithms, utilizing MediaPipe Holistic and Yolo v7, were employed for angle estimation. The accuracy of the estimations was evaluated against a wall-mounted compass, considering the ground truth. The results showed that the AI image-based algorithms displayed promising capabilities in assessing the exercises. Yolo v7 achieved the highest quality of estimations, with MAE equal to or less than 5ž, while MediaPipe, despite producing poorer results, where the MAE reaches values of 17ž, offered more features and required lower computational power than Yolo v7. However, it is worth noting that Yolo v7 was limited to exercises in 2D and did not estimate the position of key body points in 3D. Nevertheless, Yolo v7 would provide a cost-effective and easily implementable solution for measuring angles in rehabilitation activities for 1 Degree of Freedom (DOF) exercises. Overall, this study demonstrates the great promise of angle estimation for rehabilitation purposes of the AI approach.
- Austenitic hollow stainless steel beams at elevated temperatures: experimental and numerical validationPublication . Piloto, Paulo A.G.; Mesquita, Luís M.R.; Cruz, Áureo; Lopes, Nuno; Arrais, Flávio; Vila Real, Paulo
- Awareness of sustainability practices in construction: learning in a real contextPublication . Silva, Flora; Santos, Adriana; Rio, Yuleidy; Barros, Paula MariaAs part of the Higher Professional Technical Course in Civil Construction at a Polytechnic Higher Education Institution, a teaching experience was proposed in which the Technical Installations and Sustainability Practices in Construction course units were taught interconnectedly. The studentsmobilized the knowledge acquired in the first-course unit to carry out practical work on more sustainable solutions in buildings as part of the second-course unit. This experience allowed the students to apply their knowledge in scenarios close to their professional reality and to reflect on the complex issues of sustainability in construction.
- BIMandmodular construction- a review of the potential uses in design phasePublication . Carvalho, Márcio; Oliveira, Rui; Rodrigues, HugoModular construction has been gaining increasing prominence in the construction industry, driven by the growing urbanization and the need to explore new construction systems in response to frequent labor shortages, resource optimization, and a lack of quality control in construction. The set of very specific and deeply rooted characteristics of traditional construction, coupled with the costs associated with modular construction, pose a barrier to opting for modular construction systems, a situation that needs demystification. This type of construction offers numerous advantages related to production, quality, speed, comfort, and a positive contribution to sustainability, but it contains unique characteristics that need consolidation to streamline processes and enhance simplicity in usage.This paper examines the integration of Building Information Modeling (BIM) in modular construction during the design phase, in addition to identify the technologies and methods currently using, as DfMA (Design for Manufacture and Assembly), ML (Machine Learning), CDE (Common Data Environment) and others, trying integrate this concepts in the design phase of this construction system. Collaboration among construction professionals and data integration throughout all project stages are crucial elements for the successful combination of BIM and modular construction. This proposed approach introduces various current tools based on the BIM methodology for the specific development of projects for this type of construction system, relying on literature review and input from industry experts. Additionally, the paper identifies promising research areas and opportunities to further refine this integration, aiming to improve efficiency and quality in the construction industry
- Collaborative work between Polytechnic Higher Education students: manufacturing processes, safety and sustainabilityPublication . Silva, Flora; Ribeiro, J.E.; Barros, Paula MariaThe link with the real working environment, combined with the sharing of knowledge and collaboration between students from different courses, was the basis of a teaching experience involving students from the Mechanical Technology I course unit of the Mechanical Engineering degree course and the Safety and Environment course unit of the Higher Professional Technical Course in Sustainable Technologies in Mechanics and Vehicles, at a Polytechnic Higher Education Institution in the north of Portugal. The final objective was to carry out collaborative work on metalworking processes, the safety at work related to these processes, and waste management.
- «
- 1 (current)
- 2
- 3
- »