Browsing by Issue Date, starting with "2020-03-02"
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- Is the Segmented Skill Divide Perspective Useful in Migration Studies? Evidence from the Portuguese CasePublication . Marques, José Carlos; Candeias, Pedro; Góis, Pedro; Peixoto, JoãoBoundaries among social scientists continuously challenge the scope for obtaining broader reaching views. This constitutes the case for migration studies, generally perceived as interdisciplinary and correspondingly gathering contributions from many social scientists with diverse disciplinary background. For example, many practical and institutional boundaries separate those studying so-called voluntary and forced migration. The same sub-disciplinary division also applies to the study of highly skilled migration. Even when treated as part of overall migration, highly skilled migrants are viewed as so specific that their study must not be mixed in with other migrants. The main aim of this paper involves discussing the relevance of this divide between high and less skilled emigration, trying to understand which aspects place them in the same framework and which facets separate them out into isolated categories. Rather than discussing the issue in general, our purpose is to put forward evidence about sociodemographic profiles, migration strategies, and the integration processes of high and less skilled emigrants moving in the same context in order to systematically compare these groups. The context chosen for such a comparison is Portugal at the beginning of the new millennium: a country that witnessed a strong upsurge in emigration over recent decades in which high skilled and less skilled emigrants both coexisted. The data analysed in this article results from a large-scale survey applied to Portuguese individuals who left the country in the new century.
- Risk Factors, Length of Stay and In-Hospital Mortality of Methicillin-Resistant Staphylococcus aureus Infections: A Case-Control StudyPublication . Rodrigues, Rúben; Passadouro, Rui; Gomes, Odete; Castro, RicardoThe emergence of strains of methicillin-resistant Staphylococcus aureus is a serious therapeutic challenge in healthcare provision. With this study, we aimed to investigate the risk factors and clinical outcomes (mortality and length of hospital stay) associated with methicillin-resistant Staphylococcus aureus infections in patients admitted to a district hospital in Portugal.
- Admixture tuning for high‐performance concrete for the production of novel precast pre‐stressed long‐span girders for highway overpassesPublication . Fernandes, Paulo; Pala, Helena; Cavaco, Eduardo; Tiago, Paulo; Júlio, EduardoThe improvements observed in concrete technology in the last decades, namely the production of Portland cement CEM I 52.5 R, the development of third generation super-plasticizers, and the commercialization of additions with high pozzolanic properties, turned possible the development of new concrete products using high performance concrete (HPC). Nevertheless, their implementation in the production process of the conservative precast concrete industry is not yet a reality. In this paper, the development and characterization of a HPC exhibiting high workability in the fresh state and high compressive strength in hardened state is presented. This HPC aims at producing, on a competitive basis, precast pre-stressed long-span girders for highway overpasses. For this reason, the main goal was to maximize the abovementioned properties but using the constituents available at the concrete precast company supporting the research. A set of different commercial admixtures was gathered and their influence on both compressive strength and workability of concrete was experimentally investigated. Results show that the compatibility between the admixture and the cementitious material is of paramount importance. By selecting the best type of the considered super-plasticizers and by optimizing its dosage, it was possible to increase the workability from class S1 to S5 and, simultaneously, increase the compressive strength in circa 50%, up to 120 MPa, at 28 days of age.