2025
Authors
Almeida, F;
Publication
Environment, Innovation and Management
Abstract
2025
Authors
Cusi, S; Martins, A; Tomasi, B; Puillat, I;
Publication
Abstract
2025
Authors
Bialystok University of Technology; Joanna SAMUL; João Falcão e CUNHA; University of Porto;
Publication
Scientific Papers of Silesian University of Technology Organization and Management Series
Abstract
2025
Authors
Baptista, J; Teixeira, R;
Publication
ICECET
Abstract
Currently Harmonic distortion is one of the most frequent disturbances present in electrical networks, with consequences at various levels. This study intends to verify the impact that this disturbance has on the behaviour of the three-phase induction motor. Therefore, the novelty of the presented work consists in the understanding and verification of the impact of individual odd harmonics in motor behaviour. As well as analysing the impact of harmonics on the performance of induction motors, this study highlights the importance of effective technical communication and international collaboration in disseminating sustainable solutions for the green transition. The results obtained clearly demonstrate that each of the harmonics acting alone has a different influence on the motor's main parameters, especially the losses and the efficiency. In fact, lower order harmonics have greater impact on the efficiency reduction, comparing to higher orders harmonics. Therefore, special attention must to be given to attenuate it. Simultaneously, it was possible to verify the influence of total harmonic distortion in several parameters, namely with respect to torque, speed, losses and efficiency. The EMTP/ATP simulation tool was used as a tool with great capacity for transients and disturbances simulation in the voltage waveform. © 2025 IEEE.
2025
Authors
Abdellatif, AA; Fontes, H; Coelho, A; Pessoa, LM; Campos, R;
Publication
2025 IEEE VIRTUAL CONFERENCE ON COMMUNICATIONS, VCC
Abstract
This paper presents an optimized framework for Post-Disaster Search and Rescue (PDSR) that leverages multiple Unmanned Aerial Vehicles (UAVs) equipped with integrated radar and communication capabilities to simultaneously address sensing and connectivity requirements. The proposed solution includes a scalable system architecture and an optimization strategy that enable the rapid deployment of UAV swarms with diverse sensing, communication, and edge-enabled coordination features, ensuring enhanced performance in real-world disaster environments. The proposed approach formulates and solves a 3D UAV positioning and power allocation problem to maximize sensing performance and communication efficiency over multiple targets in designated zones. Due to the NP-hard and combinatorial nature of the problem, we propose a Distributed Joint Radar-Communication (DJRC) solution. This solution employs an efficient reward for potential actions and consistently selects the best action that maximizes the reward while ensuring both communications and sensing performance. Simulation results demonstrate significant performance improvements of the proposed solution over state-of-the-art radar- or communication-centric methods, with polynomial complexity dependent on the number of UAVs and linear dependence on the iteration count.
2025
Authors
Oliveira, M; Palma-Moreira, A; Au-Yong-Oliveira, M;
Publication
SOCIAL SCIENCES-BASEL
Abstract
This study aimed to investigate the effect of perceived social support on perceived employability and whether this relationship is mediated by well-being. Another objective is to study the moderating effect of perceived self-efficacy on the relationship between well-being and perceived employability. The sample comprises 316 participants, all studying at universities in Portugal. The results show that social support is positively and significantly associated with perceived employability and well-being. Well-being has a positive and significant association with perceived employability. As for the mediating effect, well-being was found to have a total mediating effect on the relationship between social support and perceived employability. Perceived self-efficacy has a positive and significant association with perceived employability. Contrary to expectations, perceived self-efficacy does not moderate the relationship between well-being and perceived employability. These results allow us to conclude that social support and well-being are the survival kits for the jungle of work. As for the practical implications, it is recommended that universities take care of the social support given to students, increasing their well-being so that their perceived employability is high.
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