RCIPL

Institutional Repository of the Lisbon Polytechnic

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The aim of this Scientific Repository is to disseminate the scientific production produced by the Instituto Politécnico de Lisboa academic community, to increase the visibility and the investigation impact, to ensure the storage of the intellectual memory and to promote the open access to the information.

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Fogo Deluxe 10 anos: laboratório, criação e ensino artístico

Publication . Espada, José; Calixto da Silva, João Gaio; Nogueira, Mariana Sá; Cordeiro, Marta; Pico, Rita; Franqueira, Sara; Loureiro, Sérgio; Alberto, Stéphane; Varela, Teresa Maria

FOGO DELUXE. Laboratório, criação e ensino artístico documenta a exposição FOGO DELUXE, apresentada entre 14 e 16 de Março na Casa do Comum. Integra-se no projecto de investigação financiado pelo Instituto Politécnico de Lisboa que pretende estudar metodologias de criação assentes na ideia de projeto, a partir da experiência acumulada durante as anteriores edições do Projeto FOGO. O Projecto FOGO é uma proposta de criação coletiva realizada por alunos de Design de Cena do Departamento de Teatro da Escola Superior de Teatro e Cinema que, em 2025, comemora dez anos. Nesta data, alargou-se o projeto à participação de alumni, fazendo do momento uma comemoração e, igualmente, uma circunstância para a colocação de hipóteses e propostas de conclusões a partir de um processo de ensino experimental. O projeto de investigação FOGO DELUXE. Laboratório, criação e ensino artístico (FDLCEA) é financiado no âmbito da 9.ª edição do Concurso de Projetos de Investigação, Desenvolvimento, Inovação & Criação Artística financiados (IDI&CA) pelo Instituto Politécnico de Lisboa. IPL/IDI&CA2024/FDLCEA_ESTC.

2025Other

Open access

Enhancing the performance of double-flush riveted joints through hybridization with adhesive bonding

Publication . Alpendre, João M. B.; Rosado, Pedro M. S.; Sampaio, Rui F. V.; Pragana, João P. M.; Bragança, Ivo; Silva, Carlos M. A.; Martins, Paulo A. F.

This paper explores the potential to enhance the mechanical performance of joints created through a new joining-by-forming technique called hybrid double-flush riveting. To achieve this, adhesive bonding is used to form hybrid lap joints with superior mechanical properties. The study focuses on high-strength steel sheets and starts by identifying the appropriate surface conditions necessary for producing strong adhesive-bonded joints. A similar strategy is applied to construct double-flush riveted joints, focusing on the geometric variables involved in the process. Hybrid joints are then created by integrating adhesive bonding with double-flush riveting, with the second carried out before or after curing is completed. The experimental development is supported by finite element analysis conducted with an in-house computer program. The mechanical performance of the hybrid joints is compared to that of purely adhesive-bonded and conventionally double-flush riveted joints through shear and peel destructive testing. Results demonstrate that hybrid joints ultimately provide greater joint strength for both solicitations. This allows showcasing the hybridization of double-flush riveting with adhesive bonding as an effective solution for applications where joint strength and continuity are essential.

2025-12Research article

Restricted access

One-pot microwave-assisted synthesis of fluorescent carbon dots from tomato industry residues with antioxidant and antibacterial activities

Publication . Barata, Patrícia; Costa, Alexandra; Martins, Sónia; Semedo, Magda; Prata, José Virgílio; Costa, Alexandra

Tomato waste (TW) was employed as a sustainable source for the synthesis of fluorescent carbon dots (CDs) via a microwave-assisted hydrothermal carbonization (Mw-HTC) method, aiming at its valorization. Several amines were used as nitrogen additives to enhance the fluorescence quantum yield (QY) of CDs, and a set of reaction conditions, including additive/TW mass ratio (0.04–0.32), dwell time (15–60 min), and temperature (200–230 °C) of the HTC process, were scrutinized. The structural analysis of the tomato waste carbon dots (TWCDs) was undertaken by FTIR and 1H NMR techniques, revealing their most relevant features. In solid state, transmission electron microscopy (TEM) analysis showed the presence of nearly spherical nanoparticles with an average lateral size of 8.1 nm. Likewise, the topographical assessment by atomic force microscopy (AFM) also indicated particles’ heights between 3 and 10 nm. Their photophysical properties, revealed by UV–Vis, steady-state, and time-resolved fluorescence spectroscopies, are fully discussed. Higher photoluminescent quantum yields (up to 0.08) were attained when the biomass residues were mixed with organic aliphatic amines during the Mw-HTC process. Emission tunability is a characteristic feature of these CDs, which display an intensity average fluorescence lifetime of 8 ns. The new TWCDs demonstrated good antioxidant properties by the ABTS radical cation method (75% inhibition at TWCDs’ concentration of 5 mg/mL), which proved to be related to the dwell time used in the CDs synthesis. Moreover, the synthesized TWCDs suppressed the growth of Escherichia coli and Staphylococcus aureus at concentrations higher than 2000 μg/mL, encouraging future antibacterial applications.

2025-06-10Research article

Open access

Intelligent sports weights

Publication . Duarte, Olga dos Santos; Jacinto, Gustavo; Véstias, Mário; Véstias, Mário; Duarte, Rui Policarpo; Duarte, Rui

Weightlifting is a common fitness activity and can be practiced individually without supervision. However, performing regular weightlifting exercises without any form of feedback can lead to serious injuries. To counter this, this work proposes a different approach to automatic weightlifting supervision off-the-person. The proposed embedded system is coupled to the weights and evaluates if they follow the correct trajectory in real time. The system is based on a low-power embedded System-on-a-Chip to perform the classification of the correctness of physical exercises using a Convolutional Neural Network with data from the embedded IMU. It is a low-cost solution and can be adapted to the characteristics of specific exercises to fine-tune the performance of the athlete. Experimental results show real-time monitoring capability with an average accuracy close to 95%. To favor its use, the prototypes have been enclosed on a custom 3D case and validated in an operational environment. All research outputs, developments, and engineering models are publicly available.

2025-06-18Research article

Open access

Mapping local memory: engaging school and community through visual arts project

Publication . Matos Pereira, Teresa; Antunes, Sandra Sofia Pereira; Gaudêncio Matos, Joana Isabel; Santos, Kátia

This text presents the results of an arts-practice-based work project, carried out with students from higher, basic and secondary education, in close collaboration between themselves and with a local community and developed as part of the research project - IMAGO MUNDI. In this scope, our project proposal was to develop arts-practice-based research processes, within the field of the visual arts, assuming as key concepts the ones of cartography and psychogeography. Departing from the mentioned concepts and aiming to address the links between school, artistic practices and community, a set of activities (as school subject or extracurricular in nature) were designed and carried out. Our aim was the development of creative processes, which, by means of arts-practice-based research, with and within the community, were able to assume the territory as its locus, thus enabling the construction of visions of the world arising from the experience (be it perceptive/sensory, social, cultural, emotional…) of the territory. Considering the intentionality of developing processes of participatory and collaborative nature, involving students, teachers and the community, the project assumed local memory as a general framework, bringing together 380 students, 10 teachers from various levels of education and 34 local retailers and shopkeepers. As mentioned above and considering the will to decentralize and integrate knowledge epistemologies, the project was developed in a city located in the south of Portugal (Santiago do Cacém). It mobilised and has involved students and teachers from the Visual Arts and Technology degree of the Lisbon’s Polytechnic University of Education; students, teachers and a resident artist from Manuel da Fonseca High School (MFHS) in Santiago do Cacém; technicians from the City Council and local retailers and shopkeepers —being the project, as the last stage of the process, devolved to and appropriated by the local community. Through exploratory visits into the territory and the developments arising from several interactions (in the form of direct dialogues) between various actors, it was decided that the project would take the form of an intervention in urban space. It would start from a mapping of human and cultural dimensions of local commerce. The analysis of the contents gathered from the interaction with local retailers and shopkeepers, namely through non-structured interviews, shows that, although in increasing decline, local commerce appears in collective memory as a factor of development, but also of self-identity, community/territory identity, resiliency, conviviality and preservation of knowledge.

2024Book part

Open access