Shell strength and fishing damage to the smooth clam (Callista chione): simulating impacts caused by bivalve dredging

The smooth clam Callista chione is exploited by a fleet of dredgers along the southwestern coast of Portugal and suffers from a high incidence of shell damage. The force required to break C. chione shells in relation to fishing impacts and dredge damage is quantified. Fishing trials and shell-strength measurements (compression and compaction experiments) were performed to determine whether shell damage was attributable to the direct impact of the dredge teeth or to sediment compaction. A three-dimensional model of C. chione was subjected to simulated force by the finite element method. Analyses of damage areas and breakage patterns revealed two groups of samples, one containing the samples from compression experiments and another with the samples from dredging and compaction experiments, suggesting that most shell damage was attributable to compaction within the sediment. Information is provided to help improve the design of bivalve dredges, by increasing both length and angle of the dredge teeth, which would reduce the compaction force and distribute it differentially within the sediment, forcing upward movement of the bivalves.info:eu-repo/semantics/publishedVersio

Fight the power oppositional discourse in african-american popular music

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão.Análise do discurso de oposição nas letras de músicas populares Afro-Americanas dos Estados Unidos. Este estudo identifica os elementos textuais que caracterizam o discurso como de oposição e os relaciona às representações de relações sociais e identidades sociais das elites e da minoria Afro-Americana. A investigação do discurso Afro-Americano revela como as relações sociais e as relações de identidade são reproduzidas, desafiadas e/ou transformadas e como relações de poder e dominação, e oposição a estas, são construídas neste discurso

Market forces, strategic management, HRM practices and organizational performance, a model based in european sample

This study uses structural equation modeling to test a model of the impact of human resources management practices on perceived organizational performance, on a large sample of European companies. The influences of competitive intensity, industry attractiveness and strategic management are considered in the model, and their direct and indirect influence on organizational performance is assessed. The model produced an adequate fit and results show that strategic management does influence human resource practices. Human resource flexibility practices and performance management have a positive impact on organizational performance, while training was not found to have a significant impact. A direct positive impact of competitive intensity and industry attractiveness on strategic management was supported by the data, as well as a direct positive effect of industry attractiveness on perceived organizational performance.

Rare diseases : an historical introduction

Proyectos “Investigación, redes asistenciales y empoderamiento: respuestas sociales y científicas a las enfermedades raras en la Península Ibérica (1940-2015)” (HAR2017-87318P), funded by the Spanish Ministry of Science, Innovation and Universities, and “Enfermedades raras: cultura visual de la rareza en España y Portugal en la Edad Contemporánea”, funded by the University of Salamanca (PIC2-2020-29