Browsing by Author "Pereira, Joel"
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- Análise térmica 2D e 3D de um pavimento/cobertura em madeira com perfuraçõesPublication . Dias, Tânia Maria Costa; Pereira, Joel; Fonseca, E.M.M.Neste trabalho apresenta-se um modelo numérico para a análise térmica 2D e 3D de um pavimento/cobertura em madeira com perfurações circulares e quadrangulares. Foi utilizado o método dos elementos finitos, com recurso ao programa Ansys, e adotado um método de solução em regime transiente não linear material. São obtidos os campos de temperaturas em diferentes posições nodais quando o modelo é submetido ao fogo. Os resultados numéricos serão obtidos utilizando elementos finitos bidimensionais (PLANE55) ou tridimensionais (SOLID70), respetivamente na análise 2D ou 3D. A camada carbonizada é verificada com a aplicação de um critério de temperatura máxima, que permite avaliar a secção residual, para um determinado instante de tempo.
- Probabilistic simulation of children exposure to migrants from packaging: photoinitiators from printing inksPublication . Machado, Carla; Fernandes, Conceição; Pereira, Joel; Poças, Maria de FátimaThis paper presents an exercise to simulate exposure of Portuguese consumers to benzophenone, a photoinitiator used in packaging printing inks. The simulation model combines experimental data of benzophenone concentration actually found in packages collected from the market and food consumption and packaging usage data obtained from a database. The model follows a probabilistic approach: the distribution of occurrence data was combines with food consumption data in a probabilistic simulation with the Monte Carlo sampling method. Exposure values found indicate that benzophenone levels of exposure are of no concern healthwise according to the tolerable daily intake defined by EFSA.
- Probabilistic simulation of children exposure to migrants from packaging: photoinitiators from printing inksPublication . Machado, Carla; Fernandes, Conceição; Pereira, Joel; Poças, Maria de FátimaThe present work presents an exercise to simulate exposure of Portuguese consumers to benzophenone, a photoinitiator used in packaging printing inks. The simulation model combined experimental data of benzophenone concentration found in packages collected from market and food consumption and packaging usage data obtained from a database. The model followed a probabilistic approach: the distribution of occurrence data was combined with food consumption data in a probabilistic simulation with the Monte Carlo sampling method. The values found indicate that benzophenone levels of exposure are of no health concern according to the tolerable daily intake defined by EFSA.