The objective of this study is to evaluate the batch enzymatic production of biodiesel in solvent-free system under ultrasound using as substrates ethanol, soybean oil and macauba fruit oil. For this purpose, a Plackett & Burman experimental design was carried out for soybean oil while a 2 design was conducted for macauba oil in order to maximize the biodiesel conversion for each system. Good conversions to fatty acid ethyl esters (FAEE), 88% for soybean oil and 75.2% for macauba oil, was obtained thus demonstrating the potential use of ultrasound for this reaction system.
Arte Pública, conforme sua tradicional conceitualização, tem andado sob intenso e apropriado questionamento com relação a sua natureza e seu destino. Neste ensaio analiso processos artísticos que atuam na esfera pública utilizando tecnologias de comunicação mediadas por computadores e tomo como estudo de caso o Projeto MN.02, que desenvolvo em parceria com a UFRJ e a Telemar/RJ. Minha proposta de intervenção no Rio de Janeiro é fortemente influenciada pela análise da atual estrutura socioeconômica da cidade.
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