Browsing by Issue Date, starting with "2010-11"
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- Chemical and bioassay fractionation of chars obtained in the co-pyrolysis of different wastesPublication . Bernardo, Maria; Lapa, Nuno; Gonçalves, Maria Margarida; Mendes, Benilde; Pinto, FilomenaThe present work is devoted to the study chars obtained in the co-pyrolisis of plastics, biomass and tyres wastes. The composition of these chars is not yet well studied and only recent an attempt was made by the aithors to provide some information about the composition and risk assessment of these materials. The objectives of this work were to perform solvent extractions, using differents, in chars obtained in the co-pyrolysis process to evaluate the extraction efficiency by characterising the different solvent extracts obtained as well as the extracted chars, to perform a chemical ans bioassay franctionation in the most toxic crude extraction in order to study the chemical composition of the fractions as well as their individual contribution to the global toxicity of the crude extarct. The results will allow to conclude which solvent should be used in the decontamination of the pyrolysis chars.
- Integração de Sistemas de Energia Renovável a Instalações ResidenciaisPublication . Marujo, R.; Simões, Teresa; Estanqueiro, AnaOs sistemas de microgeração domésticos que produzem energia a partir de fontes renováveis necessitam de legislação especifica e de ferramentas para identificar os potenciais e a viabilidade de implantação de soluções tecnológicas adaptadas ao ambiente urbano. Este artigo analisa exemplos de implementação de sistemas eólicos, fotovoltaicos e híbridos em uma edificação, debatendo questões económicas e energéticas.
- Os afazeres das Energias RenováveisPublication . Loureiro, David
- Climate variability during the last deglaciation in north-western Iberian margin and adjacent landmassesPublication . Naughton, Filipa; Sánchez Goñi, María Fernanda; Duprat, Josette; Cortijo, Elsa; Abrantes, Fátima
- Pyrolisis of plastic waste from the dismantling of used vehiclesPublication . Brás, Daniela; Costa, Paula; Pinto, Filomena; Gonçalves, Maria Margarida; Mendes, Benilde; Alves, Andreia; Silva, Marco Ritcher da; Gulyurtlu, IbrahimThe main objective of this study is to identify the experimental conditions that favor the production of bi-oil from pyrolisis of polypropylene (PP) coming from the scrapping of end-of-life vehicles. The experimental conditions tested were: initial pressure (2.1 to 10.3 bar), temperature (350 to 430ºC) and reaction time (1 to 900 s). The study reveals that the conditions that increase the rate of conversation of PP into liquid fraction (>80%) correspond to an initia pressure of 50 psi (3,45 bar), a temperature of 400ºC and a reaction time 15 minutes. All products obtained, gases, liquids and solids, were characterized and analysed by gas chromatography (GC) and mass spectrometry (GC-MS).
- Distribuição granulométrica dos sedimentos de superfície do estuário do rio MinhoPublication . Costa, Ana Novo; Mil-Homens, Mário
- Hydrogenation of rapeseed oilPublication . Martins, Susana; Pinto, Filomena; Costa, Paula; Miranda, Miguel; Gonçalves, Maria Margarida; Gulyurtlu, Ibrahim; Mendes, BenildeRapeseed oil was rapeseed oil hydrogenated using a hydrogen pressure of 160psi, over a temperature range from 200ºC to 400ºC. Residence time was varied from 6 to 120 min. The reaction was performed in the absence and in the presence of specific inorganic catalyst. The gaseous liquid and solid yield were determined. The liquid phase was characterized using elemental analysis FT-IR, GC-HD (boiling point profile) and GC-MS (chemical families profile). At a temperature of 400ºC and a residence time of 120 min the yield of hydrocarbon products is 90% in the presence of catalyst and 83% in the absence of the catalyst.
- Planktonic foraminifera as indicators of water masses north and south of the Azores Front/Current : evidence from abundance and stable isotopes dataPublication . Rebotim, Andreia; Voelker, Antje H. L.; Waniek, Joanna
- Cortiça: aplicações inovadorasPublication . Gil, Luís
- CO2 and NOx reduction in combustion systemsPublication . Cabrita, Isabel; Azevedo, Pedro; Gulyurtlu, Ibrahim