19 resultados para SLOW


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Dissertação de mestrado em Sociologia (área de especialização em Desenvolvimento e Políticas Sociais)

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Dissertação de mestrado em Media Interativos

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Dissertação de mestrado em Estudos da Criança (área de especialização em Integração Curricular e Inovação Educativa)

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Biofilm adhesion to metals (copper, aluminium and brass) was studied at two different velocities and pH values of 7 and 9. Both bacteria and metals showed negative surface charges at those values of pH, which tends to slow down adhesion. Film densities increased with the fluid velocity and were also affected by the pH and by the growth rate of the bacteria. Long duration tests based on heat transfer measurements were run at five different fluid velocities and at pH = 7, showing in general an asymptotic behaviour and a control of deposition by adhesion and growth phenomena.