The permeability parameters for moisture transmission through hydrophilic films are well known to be thickness dependent, this effect appearing in permeability studies based on diffusion models. In our model we assume that, besides diffusion, some of the water vapour of the diffusion flux is removed by the hydrophilic components of the films. This water is immobilized and becomes hydration water of the hydrophilic molecules. This paper describes a diffusion-adsorption model, with thickness-independent parameters, which explains this phenomenon.
No geral, a prática da engenharia está profundamente atrelada ao desenvolvimento do ordenamento sociotécnico capitalista hegemônico. Assumir tal atividade como caminho que, se quisermos, também pode produzir desenvolvimento (ou transformação) social – ou seja, a subversão desse ordenamento – é algo relativamente recente no mundo. No Brasil, trocas de experiências e adensamento da reflexão sobre o tema estão grandemente associadas ao Encontro Nacional de Engenharia e Desenvolvimento Social (ENEDS). Por conta disso, iniciou-se um trabalho de pesquisa que, tendo como base os 392 artigos apresentados nas doze primeiras edições anuais do encontro, busca, em um primeiro momento, descrever o campo de engenharia e desenvolvimento social no país. Neste artigo, apresentamos os primeiros dados que este trabalho nos propiciou, assim como algumas hipóteses iniciais para eles. Ao seu final, descrevemos preliminarmente os próximos passos pretendidos nessa empreitada e aquilo que se busca com eles.
This article aims to describe the experience of the course “Open Data and Social Movements”, conceived as a tool for research on open data engagement. While it focuses on training activists to understand and use open data, it enables observation on why people want to use open data, the main impediments to it, and the desired improvements, configuring as research method on community informatics. The pedagogic inspirations of this research and course lie in Popular Education and Participatory Action Research.
This article aims to discuss the process of development and improvement of a community web portal from the perspective of references such as social capital, solidary technology, local development and community organizing. As a case study we used the Cidade de Deus web portal (www.cidadededeus.org.br), result of a project of the Technical Solidarity Lab (Soltec / UFRJ) with community-based organizations (CBOs) of Cidade de Deus. Our main hypothesis is that more important than the technology itself, the process of developing this technology in a participatory manner can encourage community participation.
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