Percorrer por autor "Sousa, Jorge"
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- Effects of Noise Frequency on Performance and Well-BeingPublication . Sousa, Jorge; Monteiro, Raquel; Tomé, David; Rodrigues, MatildeThe features of occupational noise, in particular sound pressure levels, the type of noise and its frequency can be related to several physiological and non-physiological effects. However, studies about the influence of occupational noise on non-physiological effects are still scarce. The aim of this study was to investigate effect of intermittent sound patterns with different frequency on subjects’ performance and well-being. Five conditions were simulated and tested through an experimental study: Standard Condition (C0); Industrial noise with alert sounds at 500 Hz (C1); Industrial noise with alert sounds at 1000 Hz (C2); Industrial noise with alert sounds at 2000 Hz (C3); Industrial noise with alert sounds at 3000 Hz (C4). The noise levels were fixed at 45 ± 0.3 dB (A) in C0, and in 68 ± 0.5 dB (A) in the other conditions. The influence of noise on participants’ attention and short-term memory was assessed with the serial recall and response inhibition tests. Discomfort, stress and annoyance were accessed using Visual Analog Scales (VAS). Sixteen undergraduate students were included in this study (8 male; age: M = 22.25 yrs; SD = 0.7 yrs). Higher discomfort, stress and annoyance perceptions were found in condition C4; however, for task performance, no significant differences were found between conditions. This study provided important insights about the influence of different noise frequencies on subject’s performance and well-being. Future research should involve workers and how they react in the field to these conditions.
- Effects of noise frequency on performance and well-beingPublication . Sousa, Jorge; Monteiro, Raquel; Tomé, David; Rodrigues, MatildeIn a previous study we found that intermittent sounds, simulating alarm sounds, have a relevant effect on workers’ performance and wellbeing. As the frequency of these sounds can influence subjects performance and well-being, a new study testing the effect of intermittent sound patterns with different frequency was carried out. Five noise conditions were simulated and tested through an experimental study with 16 undergraduate students. The influence of each condition on participants’ attention and short-term memory was assessed with the serial recall and response inhibition tests. Discomfort, stress and annoyance were accessed using visual analog scales. No significant differences were found between the noise conditions in what regards to subjects performance. However, higher discomfort, stress and annoyance perceptions were found in condition with intermittent sounds at 3000 Hz. This study provided important insights about the influence of different noise frequencies on subject’s performance and well-being.
- Geotechnical Hazards in Rocky Slopes (Northern Portugal): Focused on MethodologyPublication . Trigo, José Filinto; Pacheco, Carlos; Fernandes, João; Ferraz, Pedro; Sousa, Jorge; Machado, Rui; Duarte, Sara; Mendes, Ana; Freitas, Liliana; Teixeira, José; Ramos, Luís; Afonso, Maria José; Chaminé, Helder I.Interdisciplinary studies of rocky slopes stability have been performed on Northern Portugal, that allowed to establish a design methodology. This approach carries together the use of more traditional techniques, with the application of more recent technologies, such as unmanned aerial vehicles. This work presents a set of procedures that have been applied successfully in several case studies, describing the different stages, with an emphasis on the production of a ground three-dimensional model. This model is generated from photographs obtained with successive drone flights, with overlapping. It is the support for the development of subsequent stages, especially for the characterisation of the trajectories of rockfalls and modelling, the development of susceptibility mapping and of rock slope hazard. In this context, the Natural Slope Quality Index (N-SQI ), an adaptation of the Slope Quality Index (SQI), orientated to natural slopes, is presented. The Block Gravity Number (BGN), created in order to hierarchise rock blocks, selecting them for modelling, is also proposed.