Browsing by Issue Date, starting with "2008-10"
Now showing 1 - 10 of 25
Results Per Page
Sort Options
- Distribuições espaciais de concentrações em Cu, ZN, Pb e Co apresentadas por sedimentos de corrente na Zona Sul Portuguesa : implicações para a prospecção mineralPublication . Feliciano, Ricardo; Mateus, António; Matos, João Xavier
- Prospecção mineral no sector de Barranco das Lages-Abegoaria, NW de Portel, Zona Ossa Morena : ponto de situaçãoPublication . Beleque, Andreia; Matos, João Xavier; Mateus, AntónioNo sector de Barranco das Lages-Abegoaria (Faixa Magnetítico-Zincífera, Zona de Ossa Morena), as anomalias de Cu, Zn e Pb em solos apresentam anisotropia espacial NW-SE / NNW-SSE e posicionam-se acima de 17.5, 97 e 24 ppm, respectivamente; o fundo local para o Cu cifra-se em 363 ppm. As principais anomalias coincidem com os chapéus de ferro de Barranco das Lages e Vale de Rebolo, circunscritos a unidades predominantemente metassedimentares do Neoproterozóico e Câmbrico Inferior. A NE destas anomalias geoquímicas, e sobre o contacto entre unidades de natureza xistenta e anfibolítica (Ordovícico-Silúrico?), desenvolve-se uma importante anomalia gravimétrica, a qual foi investigada por sondagem, revelando conter mineralização sulfuretada disseminada; a sua génese é correlativa da retrogradação metamórfica Varisca, cujos estádios tardios são marcados por razões a/r elevadas e maior focalização dos fluídos ao longo de fracturas diversas.
- Minerals and trace elements from milk of indigenous Portuguese goat breads: preliminary resultsPublication . Trancoso, Inês; Trancoso, Maria Ascensão; Martins, António P. L.; Roseiro, Luisa B.
- Validation and quality assurance applied to goat milk chemical compositionPublication . Trancoso, Inês; Roseiro, Luisa B.; Martins, António P. L.; Trancoso, Maria Ascensão
- Green initiative for energy efficient eco-products in the construction industryPublication . Partidário, Paulo Jorge; Goncalves, Helder
- Solar XXI building PV systems: performance during the first two yeras of operationPublication . Rodrigues, Carlos; Viana, Susana; Joyce, A; Goncalves, Helder; Silva, António Rocha eThe purpose of this paper is to present the results obtained in the first two years of operation of the grid-connected photovoltaic (PV) systems installed in the named “Solar XXI” building. One PV system, made with multicrystalline silicon modules, has a peak power of 12 kW and was installed on the façade; another system made with amorphous silicon modules has a peak power of 6 kW and was installed in the surrounding park area near the building. From 1st February 2006 until 31 July 2008, the measured daily average, of the building electrical energy consumption, was about 75 kWh and the two PV systems produced in average about 72 % of this energy. The averaged measured Performance Ratio of the systems was about 0.84 for the PV Façade and about 0.76 for the PV in the Park.
- Os edifícios bioclimáticos e a integração das energias renováveis e os sistemas energéticos : Livro de apresentações do seminárioPublication . Goncalves, Helder; Camelo, Susana
- On the sustainable development of solar thermal obligations in buildings in the framework of the Portuguese casePublication . Prates, Manuel João Lopes; Costa, J. Cruz; Mendes, J. Farinha; Carvalho, Maria JoãoThis paper starts remembering the steps given in Portugal to prepare the introduction of a solar thermal obligation. Next, it presents a description of the present legislation related to the Solar Thermal Obligation (STO) and to other incentive measures for growth of the solar thermal market in Portugal. The main problems with implementation of the new regulation are analysed and systematized. Based on the acquired knowledge, further actions are presented to guarantee the success of Solar Thermal Obligation, namely proposals for updating the obligation in conformity with best practice for solar thermal installations and taking into account the new realities upcoming from the actual solar thermal
- Solar climate of Azores: results of monitoring at Faial and Terceira islandsPublication . Aguiar, Ricardo; Silva, António R.; Coelho, RicardoThe North Atlantic archipelago of Azores (Portugal) consists of nine islands, located about 1,500 km from mainland Europe. Currently the Azores has about 243,000 inhabitants, which depend heavily on imported fossil fuel for their energy supply. This is a concern for the regional Government and its Agency for Energy and Environment, ARENA, which naturally support energy efficiency and use of renewable energies. The Azores are rich in several renewable resources, and have even pioneered Portuguese exploitation of wind, wave, and high enthalpy geothermal energy for electricity generation. However, so far solar energy has not been a priority in the renewable energy panorama, probably because the Azores climate has been considered too cloudy. Nevertheless, this is true only in comparison with the Portuguese mainland, as the radiation levels are probably similar or even better than those of Northern Europe. In this context ARENA is developing efforts for increasing the use of solar systems. A collaboration, partly financed by an INTERREG III B Project of the European Community, has been established with INETI, the Portuguese Public Laboratory for the area of Energy, to improve the solar climatology of the Azores. This climatology is indeed quite incomplete. It consists mainly on daily measurements for two sites only at the S. Miguel and Terceira islands. Some sunshine records are available from Campbell-Stokes heliographs. Satellite data exists but their quality is uncertain due to the small size of the islands and the shallow view angle.
- Implementing a new method for the design of bioclimatic buildingPublication . Graça, João Mariz; Bento, João; Goncalves, HelderA tool for support the design of bioclimatic buildings is under development. This tool is also specialy adapted to the particular needs of buildings in the portuguese territory, since it includes the possibility of doing evaluations according to the requirements that are imposed by the new regulations of thermal performance for buildings (RCCTE). This tool will allow designers of bioclimatic architecture to easily extract reports of different energy simulation programs, such as energy Plus, Radiance and RCCTE thermal code. The system is provided with a 3D Editor that shares multiple interfaces with the different simulation programs above mencioned. A particular method for the conception of bioclimatic architecture is assumed, however different types of evaluations can be performed with this interface program. A particular method for the conception of bioclimatic buildings is here sugested. It begans with the evaluation of the complience with the portuguese thermal codes. Once the shape and construction for the building under design are conformant with regulations, other evaluations are sugested. The system provides the possibility of automaticaly generate a geometric definition for future energy plus simulation that maches the previous RCCTE definition, however with some simplification assumptions. This can bring closer the evaluations of the thermal code requirements with the energy Plus evaluations, and so to take advantage of a large number of energy plus features in a detailed analysis. The program under development provides automatic generation of some particular features of Energy Plus that were found very usefull for design tasks of bioclimatic buildings, such as the generation of; adjacent zones, trombe walls zones, earth tubes, detailed window variables, etc.
- «
- 1 (current)
- 2
- 3
- »