2025
Authors
Magalhaes, M; Melo, M; Coelho, A; Bessa, M;
Publication
COMPUTERS & GRAPHICS-UK
Abstract
This paper aims to evaluate how different combinations of multisensory stimuli affect the vividness of users' mental imagery in the context of virtual tourism. To this end, a between-subjects experimental study was conducted with 94 participants, who were allocated to either a positive or a negative immersive virtual environment. The positive environment contained only pleasant multisensory stimuli, whereas the negative contained only unpleasant stimuli. For each of the virtual experiences, a multisensory treasure hunt was developed, where each object found corresponded to a planned combination of stimuli (positive or negative, accordingly). The results showed that positive stimuli involving a higher number of sensory modalities resulted in higher reported vividness. In contrast, when the same multisensory modalities were delivered with negative stimuli, vividness levels decreased - an effect we attribute to potential cognitive overload. Nevertheless, some reduced negative combinations (audiovisual with smell and audiovisual with haptics) remained effective, indicating that olfactory and haptic cues play an important role in shaping users' vividness of mental imagery, even in negative contexts.
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
Rocha, JD; Mamede, HS; Reis, ML; dos Santos, AMP;
Publication
EMCIS (2)
Abstract
The concept of digital ecosystems emerged as a fantastic opportunity to innovate in infrastructure for SMEs and entrepreneurs by creating new business models and pushing innovations regarding their products and procedures through platforms in the cloud that may simplify and make it easier to research information, store it, and use it in a digital economy. However, when it is necessary to abandon a cloud solution, there will be a huge vendor dependence. Supplier dependency could be a risk to SME companies because the data is stored in cloud database environments, where the migration process could be difficult if data is lost. The objective is to research data privacy in cloud digital ecosystems, mitigate the risk of vendor lock-in, achieve full compromise of access to SME’s organisational data, and comply with the contingency of the business in case of an eventual need for cloud environment change.
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