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- Microalgal reactors: a review of enclosed system designs and performancesPublication . Carvalho, Ana P.; Meireles, Luís A.; Malcata, F. XavierOne major challenge to industrial microalgal culturing is to devise and develop technical apparata, cultivation procedures and algal strains susceptible of undergoing substantial increases in efficiency of use of solar energy and carbon dioxide. Despite several research efforts developed to date, there is no such thing as “the best reactor system”- defined, in an absolute fashion, as the one able to achieve maximum productivity with minimum operation costs, irrespective of the biological and chemical system at stake. In fact, choice of the most suitable system is situationdependent, as both the species of alga available and the final purpose intended will play a role. The need of accurate control impairs use of open-system configurations, so current investigation has focused mostly on closed systems. In this review, several types of closed bioreactors described in the technical literature as able to support production of microalgae are comprehensively presented and duly discussed, using transport phenomenon and process engineering methodological approaches. The text is subdivided into subsections on: reactor design, which includes tubular reactors, flat plate reactors and fermenter-type reactors; and processing parameters, which include gaseous transfer, medium mixing and light requirements.
- O projecto experimental “Carrossel”: para uma aproximação ao cinema interactivoPublication . Caires, Carlos SenaEste artigo descreve os processos de implementação e realização do projecto experimental “Carrossel”. Este projecto tem como objectivo estudar novos processos de interacção com a imagem em movimento, nomeadamente a imagem vídeo. Em primeiro lugar expomos as questões teóricas que motivaram a realização deste projecto, novas perspectivas e estruturas narrativas e o contexto histórico no qual se insere. Posteriormente, é descrito o processo de instalação e funcionamento do mesmo. “Carrossel” procura uma nova aproximação ao que poderíamos intitular de “cinema interactivo”.