Percorrer por data de Publicação, começado por "2021-05-19"
A mostrar 1 - 2 de 2
Resultados por página
Opções de ordenação
- Which cognitive and perceptual skills best discriminate elite female handball playersPublication . Biscaia, Paula; Coelho, Eduarda; João, Paulo Vicente; Monteiro, Diogo; Hernandez-Mendo, António; Alves, JoséThe purpose of this study was to identify which cognitive and perceptual skills best discriminate elite female handball players according to the age group to which they belong to. The sample consisted of 73 Portuguese national teams’ female handball players, aged between 11 and 29 years, with an average of 7.5 (± 3.7) years of practice. The following tests were applied: Thurstone Identical Figures Test, Toulouse-Piéron Concentrated Attention Test, and the Nideffer Attentional and Interpersonal Style Inventory to evaluate perceptual skills, the polyreactiometer for Windows – PRWin to evaluate information processing, and an evaluation protocol for precision in anticipation using the temporal occlusion paradigm. The interpretation of the obtained discriminant function was based on the structure of the coefficients greater than |0.30|. The Seniors’ age group is discriminated from that of Talents by their better reaction, perception, and attention times, namely, by the ability to integrate several stimuli simultaneously and by a better capacity to anticipate future events more accurately. This discriminating model can help coaches recruit players as well as improve psychological training programmes.
- Fatigue Behavior of Hybrid Components Containing Maraging Steel Parts Produced by Laser Powder Bed FusionPublication . Santos, Luís; Jesus, Joel de; Borrego, Luís; Ferreira, José A. M.; Fernandes, Rui F.; Costa, José D. M. da; Capela, CarlosThis investigation concerns about of fatigue behavior under controlled loading and under strain control for hybrid specimens with parts produced with conventional processes in steel AISI H13 and the stainless steel AISI 420 and the rest part produced by laser powder bed fusion in AISI 18Ni300 steel. The controlled loading tests were performed in constant and variable amplitude. Fatigue failure of hybrid samples occurs mostly in laser-melted parts, initiated around the surface, in many cases with multi-nucleation and propagated predominantly between the deposited layers. Fatigue strength of hybrid parts, tested under displacement control is similar, but for specimens tested under load control the fatigue strength the fatigue strength of hybrid specimens is progressively lesser than laser powder bed fusion samples. Despite a tendency to obtain conservative predictions, Miner’s law predicts reasonably the fatigue lives under block loadings. The interface between materials presented an excellent joining and fatigue strength because the fatigue failure of hybrid samples occurred mostly in laser melted parts out of the interface.