Projeto e seleção de materiais magnéticos permanentes

Os materiais magnéticos permanentes têm sido utilizados em dispositivos eletromagnéticos há mais de 100 anos mas, devido aos progressos recentes das suas características magnéticas e a disponibilidade a custos acessíveis, a sua aplicação é atualmente transversal a uma vasta gama de áreas tecnológicas. A introdução dos ímanes de terras raras nos finais da década de 60 do século passado revolucionou a engenharia de projeto, conduzindo a uma reconfiguração dos dispositivos com fatores de escala anteriormente impraticáveis, elevando ainda o rendimento daqueles, ao eliminar as perdas associadas à criação de campos magnéticos baseados em densidades de correntes. Este trabalho descreve as principais classes dos materiais magnéticos permanentes com relevância comercial e fornece as linhas gerais do projeto magnético, com especial relevo para os materiais baseados em terras raras.

Deteção e seleção de talentos em andebol : diferentes perspetivas

In seeking to maximize athletic performance, optimizing the improvement of players, we find a line of study that focuses on the detection, selection and talent development. The talent is one of the fundamental constraints to access to excellence in competitive sport. Its identification is the first step to select individuals with the characteristics required to achieve the improvement sports through a complex process of expertise. The aim of this work is essentially to realize how it is made detection and selection of talent in Handball and understand how countries reference to the sport develop their work. In this sense, we choose in addition to Portugal, France, Spain and Denmark. We want to see how these four countries invest and develop detection and talent selection, taking into account the different characteristics of countries in many different contexts. So we can see that each country invests in talent selection and detection taking into account the financial capacity, the development and popularity of the sport. In all three countries, with the exception of Portugal, the Handball is a sport with great impact not only through their championships as well as the level of selections. All invest in detection and selection of talents initially by direct observation and collection of anthropometric data, and organize their structure depending on the size of your country. With the exception of France all other countries after detecting the taletos, fits us in selection schemes open. France chooses to create training centers where these young people will develop their skills. These centers are autonomous although the supervision and guidance of the technical staff of the federation. All countries except Portugal, opt to develop regional selections, thereby widening the recruitment base within a competitive framework extra club.