Browsing by Issue Date, starting with "2009-06"
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- Gasification study of cynara cardunculus to produce hydrogen rich gasPublication . Franco, Carlos; Lopes, Helena; Pinto, Filomena; Andre, Rui N.; Gulyurtlu, Ibrahim; Cabrita, IsabelThe need to substitute fossil fuel feedstocks with endogeneous biomass to produce energy with lower environmental impact makes necessary to develop innovative and technologically more advanced processes for energy production. Gasification of Cynara cardunculus L. (cardoon) alone and mixed with Eucalyptus was carried out in a bench scale fluidized bed gasifier to study the influence of operating parameters that could lead to a gas rich in hydrogen. The gasification tests were carried out using a mixture of oxygen and steam, as gasifying agent, to avoid the dilution effect of nitrogen that exists in air. The effect of catalysts addition to the bed on gas composition was analyzed as well as the influence in the level of contaminants like H2S, HCl, NH3 and tars in the gas produced. Steam and temperature had a positive effect by promoting the hydrogen production. The higher heating value of the gas produced was determined to be in the range 12 – 15 kJ/nm3 in a dry-nitrogen-free basis. Cardoon contains N, S and Cl which may give rise to problems during the gasification process and to the eventual use of the syngas produced. The results obtained showed that the presence of contaminants could be decreased through retention in the solid phase and by employing a condensation system to separate out pollutants in the liquid phase. This paper will fully present and discuss the results obtained with the gasification of cynara cardunculus and eucalyptus in a fluidized bed gasifier.
- P-rich nodules and hollow graptolites in the upper Silurian of the Moncorvo synclinorium, north PortugalPublication . Sá, Artur Abreu; Piçarra, José Manuel; Gutiérrez-Marco, Juan Carlos; Sarmiento, Graciela Noemi
- A Casa das Pedras em Montesinho, Bragança : aproveitamento didáctico de uma colecção particular de rochasPublication . Meireles, Carlos; Esteves, Eduardo
- Response of pre-edge details from Fe K-edge XANES spectra to the large cation in jarositesPublication . Silva, Teresa; Figueiredo, M. Ondina
- Silurian of the Barrancos-Hinojales domain of SW Iberia : a contribution to the geological heritage of the Barrancos area, Portugal, and the Sierra de Aracena-Picos de Aroche Natural Park, SpainPublication . Piçarra, José Manuel; Gutiérrez-Marco, Juan Carlos; Sarmiento, Graciela Noemi; Rábano, Isabel
- O acervo colonial das Comissões Geológicas de Portugal, 1857-1918: nota preliminar [Resumo]Publication . Brandão, José Manuel Moraes Vale
- A colecção de arte de minas e metalurgia do Instituto Superior de Engenharia do PortoPublication . Costa, Patrícia; Chaminé, H. Iglésias; Brandão, José Manuel Moraes Vale; Callapez, Pedro M.
- Peças de Adolphe D'Archiac no núcleo inicial de colecções da Commissão Geológica do Reino, Portugal [Resumo]Publication . Brandão, José Manuel Moraes Vale
- Building a collaboratory in an engineering R&D organizationPublication . Correia, Zita; Egreja, Catarina; Barrulas, Maria Joaquina; Gil, Rui; Ferreira, Diogo R.; Cunha, Luís Arriaga daThis paper presents the results achieved so far in the process of preparing the ground to develop a collaboratory in an Engineering R&D organization. This case study is part of a broader research project engaged in building a collaboratory in order to share knowledge and resources among the Portuguese State Laboratories. In the process of preparing the ground to develop the collaboratory in the first of the State Laboratories studied, an information audit was conducted and an online survey was launched. The survey targeted 240 people, including mainly professional researchers (c. 160), but also research trainees and some technical staff integrating the research teams. The questionnaire was designed so as to collect data on the information management and information culture of the organization, on the researchers’ information needs and information seeking, and on the information flows taking place, and was composed of two distinct and independent parts. The first obtained seventy nine responses, while the second achieved ninety two, corresponding to 33% and 38% of the total sample, respectively. The work carried out will provide the basic requirements for the task of developing an infrastructure and tools for the collaboratory, addressing the various aspects of collaborative software tools, information archiving and intelligent search, remote control of scientific instruments and multi-channel access to the services.
- Temperature and nutrients changes during MIS 11c and the Holocene on the Portuguese marginPublication . Salgueiro, Emília; Voelker, Antje H. L.; Martin, Pamela A.; Rodrigues, Teresa; Prabhu, Channarayapattana N.; Abrantes, Fátima; Grimalt, Joan O.
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