Encontrados 3 documentos, a visualizar página 1 de 1
Calibração experimental de uma câmara digital
Crespo, Joel; Fernandes, J. C. AparícioApresenta-se um método prático de obtenção da resposta do sensor de uma máquina fotográfica digital comum, com base numa imagem de referência produzida em qualquer loja de impressão de fotografia. O grande objectivo é poder caracterizar a qualidade da luz emitida por lâmpadas de baixo consumo sem recorrer a dispositivos especiais.
Foldable slewing crane
Pedrosa, Delfim; Teixeira, Patrício; Crespo, Joel; Costa, Daniel; Esteves, João SenaThis paper describes a slewing crane with electromagnet, operated by three three-phase induction motors but powered from a single-phase power supply. A switchboard drives the motors and the electromagnet. From its seat – mounted on the crane – an operator can make the crane arm slew left or right. The electromagnet can be moved back, forward, up or down and is capable of lifting 80kg loads. Crane slewing is lim...
Slewing crane with electromagnet
Pedrosa, Delfim; Crespo, Joel; Costa, Daniel; Esteves, João SenaThis paper describes a slewing crane with electromagnet, operated by three three-phase induction motors. A switchboard described in a separate paper, which also depicts the electromagnet construction details, drives the motors and the electromagnet. From its seat – mounted on the crane - an operator can make the crane arm slew left or right. The electromagnet can be moved back, forward, up or down. The crane is...
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