RCIPL
Repositório Institucional do Politécnico de Lisboa
Entradas recentes
Improving organizational commitment among healthcare employees in Angola: the role of psychological capital and perceived transformational leadership
Publication . Geremias, Rosa Lutete; Lopes, Miguel Pereira; Sotomayor, Ana Maria
While previous studies conducted in sub-Saharan African countries have focused on verifying standards of clinical care and assessing challenges faced by healthcare professionals, the present study fills a gap in the literature in that it explores the factors that may drive the organizational commitment of healthcare professionals in Angola. This study aimed to analyze the relationship between psychological capital and organizational commitment through perceived transformational leadership. Therefore, using the quantitative methodology, a self-report questionnaire was applied to 342 healthcare professionals (174 male, 168 female) from different public and private hospitals located in three large cities in Angola. The results confirmed that psychological capital is positively related to affective commitment and that perceived transformational leadership is a mediating variable of this relationship. Therefore, this study highlights the role of psychological capital and perceived transformational leadership in improving affective commitment in challenging environments.
A new deformable self-clinching fastener
Publication . Pragana, João P. M.; Sampaio, Rui F. V.; Clara, Ricardo G.; Bragança, Ivo M. F.; Silva, Carlos M. A.; Martins, Paulo A. F.; Bragança, Ivo
This work proposes a novel deformable self-clinching fastener for producing hidden lap joints suitable for both structural and electric power distribution applications. The fastener, characterized by an axisymmetric concave shape, is employed to fabricate hybrid busbar joints between electrically conductive strips of different materials and thicknesses. The self-clinching process with the new deformable fastener involves machining dovetail holes in both conductors and applying a squeezing force to the fastener to create a form-closed mechanical joint. The work encompasses both experimental investigations and numerical modeling using finite element analysis and is carried out on unit cells made from aluminum and copper conductors, which are representative of the joining process. The investigation evaluates force requirements, conducts destructive testing, and performs thermo-electric characterization of the new joints to conclude on the suitability of the new deformable self-clinching fastener for electric power distribution applications. Results indicate that while copper fasteners necessitate greater squeezing forces, they offer superior mechanical and thermo-electrical performance compared to aluminum fasteners in hybrid busbar joints.
Linking psychological capital to organizational commitment: the moderating role of perceived aversive leadership of employees in Angola
Publication . Geremias, Rosa Lutete; Lopes, Miguel Pereira; Sotomayor, Ana Maria
Organizational commitment is an indicator of organizational performance, regarding the attainment of competitive advantages. Knowing the factors that promote or inhibit organizational commitment fills a gap in the literature in the area of aversive leadership in Angola and reinforces the role of managers in promoting employees’ organizational commitment. This study aimed to analyze the moderating role of perceived aversive leadership in the relationship between psychological capital and organizational commitment. Although recent studies have indicated the negative effects of aversive leadership on organizational outcomes, the role of perceived aversive leadership on employees’ organizational commitment has not been tested. To this end, we applied a self-report questionnaire from 335 employees from different sectors of activity in Angola to examine this relationship. To analyze the results of the study, we used structural equation modeling. The results showed that the relevance of psychological capital in organizational commitment is highlighted when perceived
aversive leadership is low. On the other hand, when perceived aversive leadership is high, employees will exhibit lower levels of organizational commitment. This study may influence the adoption of more sophisticated leadership selection techniques, based on behavioral and situational interviews, to ensure that professionals with aversive behaviors cannot hold positions of responsibility.
A dieless Nakajima test for additively deposited materials
Publication . Sampaio, Rui F. V.; Rosado, Pedro M. S.; Pragana, João P. M.; Bragança, Ivo M. F.; Nielsen, Chris V.; Silva, Carlos M. A.; Martins, Paulo A. F.; Bragança, Ivo
This paper focuses on a novel Nakajima test for characterizing the formability of additively deposited materials without extracting sheet blanks. Material is deposited by wire-arc additive manufacturing in the form of ‘Π-shaped’ vertical walls, and the testing regions are then machined to the desired thickness and shapes for subsequent deformation with a hemispherical punch in a press. Digital image correlation is used to obtain the strain loading paths of the deposited material up to failure. The novel test eliminates the need for the special-purpose tool setup of conventional Nakajima tests, simplifying the overall procedure and reducing costs.
Emergent pan-azole-resistant Aspergillus fumigatus in poultry farms: implications for One Health
Publication . Gomes, Bianca; Ramos, Miguel J. N.; Nunes, Mónica; Viegas, Carla; Dias, Ricardo
Aspergillus fumigatus is the leading etiological agent of aspergillosis in humans and animals. Azole resistance is an emerging public health concern. Poultry bedding material may act as an environmental reservoir for azole-resistant A. fumigatus. Understanding environmental reservoirs is essential to mitigate potential risks across the human–animal–environment interface. Aim of the study: To assess the occurrence of azole-resistant Aspergillus fumigatus in Portuguese poultry farms.