16 documents found, page 1 of 2
Estabilidade de uma mistura de sais fundidos contendo lítio para o armazenament...
Pedrosa, Fátima; Nogueira, Carlos; Marcelo, Teresa; Cunha Diamantino, Teresa; Figueira, Isabel; Bonk, A.; Bauer, T.RESUMO: Para o desenvolvimento das tecnologias de concentração solar térmica têm sido desenvolvidas misturas de sais, compostas principalmente por metais alcalinos/alcalino-terrosos, a serem utilizadas como meio de armazenamento de energia. A introdução de nitrato de lítio na mistura de nitratos de Na e K permite a diminuição do ponto de fusão da mistura, reduzindo assim os riscos de congelamento nas tubagens e...
Towards an alignment of national research programmes and funding for CST techno...
Cardoso, João P.; Marcelo, Teresa; Jarraud, Nicolas; Dufour, Elena; Papanicolas, Costas N.; Mendes, J. Farinha; Blanco-Gálvez, JuliánABSTRACT: One of the STAGE-STE project work packages aims to develop relations with public bodies relevant to Concentrating Solar Thermal (CST) research, such as national research funding agencies, ministries and other leading decision making bodies, in order to foster coordination and alignment of research programmes and funding at European level. Working groups have been created in eight European countries an...
Towards an alignment of national research programmes and funding for CST techno...
Cardoso, João P.; Marcelo, Teresa; Jarraud, Nicolas; Dufour, Elena; Papanicolas, Costas N.; Mendes, J. Farinha; Blanco-Gálvez, JuliánABSTRACT: One of the STAGE-STE project work packages aims to develop relations with public bodies relevant to Concentrating Solar Thermal (CST) research, such as national research funding agencies, ministries and other leading decision making bodies, in order to foster coordination and alignment of research programmes and funding at European level. Working groups have been created in eight European countries an...
Molten nitrate salts containing lithium as thermal energy storage media : a sho...
Pedrosa, Fátima; Marcelo, Teresa; Nogueira, Carlos; Gomes, A.; Cunha Diamantino, TeresaABSTRACT: Energy storage plays a crucial role in the development and progress of renewable energy sources. In the case of thermal energy, storage has been a step ahead since storage solutions already exist, unlike other conversion energy technologies. In this sense, the utilization of molten salts, mainly composed of mixtures of alkali/alkaline earth metals, in nitrate forms (sometimes also with nitrite), have ...
Effect of particle size of starting oxide powders on the performance of doped-l...
Oliveira, Fernando Almeida Costa; Marcelo, Teresa; Alves, Cátia; Santos, Mário João dos; Mascarenhas, João; Trindade, B.La9.33Si2Ge4O26 oxyapatite powders were synthesized at room temperature through mechanical alloying of La2O3, GeO2 and SiO2 precursor powders with different particle sizes as well as crystal structure in the case of silica powder (crystalline/amorphous). The mechanical alloyed mixtures were subsequently sintered by microwave heating at 1350 C for 1 h in order to obtain dense and homogeneous materials. All sinte...
Effect of particle size of starting oxide powders on the performance of doped-l...
Oliveira, Fernando Almeida Costa; Marcelo, Teresa; Alves, Cátia; Santos, Mário João dos; Mascarenhas, João; Trindade, B.La9.33Si2Ge4O26 oxyapatite powders were synthesized at room temperature through mechanical alloying of La2O3, GeO2 and SiO2 precursor powders with different particle sizes as well as crystal structure in the case of silica powder (crystalline/amorphous). The mechanical alloyed mixtures were subsequently sintered by microwave heating at 1350 C for 1 h in order to obtain dense and homogeneous materials. All sinte...
The earrings of Pancas treasure: Analytical study by X-ray based techniques – A...
Tissot, Isabel; Tissot, M.; Manso, M.; Alves, L. C.; Barreiros, M. Alexandra; Marcelo, Teresa; Carvalho, M. L.; Corregidor, V.; Guerra, M. F.The development of new metallurgical technologies in the Iberian Peninsula during the Iron Age is well represented by the 10 gold earrings from the treasure of Pancas. This work presents a first approach to the analytical study of these earrings and contributes to the construction of a typological evolution of the Iberian earrings. The manufacture techniques and the alloys composition were studied with three co...
Novel two-step processing route combining mechanical alloying and microwave hyb...
Santos, Mário João dos; Alves, Cátia; Oliveira, Fernando Almeida Costa; Marcelo, Teresa; Mascarenhas, João; Cavaleiro, A.; Trindade, B.In this work, microwave hybrid sintering at 1300 and 1350 °C was carried out for densification of La9.33Si2Ge4O26 mechanically alloyed powder with apatite structure. The pellets sintered at these two temperatures present the same structure (apatite) with relative densities of 92 and 96%, respectively. Mechanical analysis performed on sintered materials revealed the following results: hardness of 7.1 and 8.0 GPa...
Effect of the sintering conditions on the morphology of La9.33Si2Ge4O26 oxyapat...
Macatrão, Mafalda; Santos, Mário João dos; Alves, Cátia; Oliveira, Fernando Almeida Costa; Marcelo, Teresa; Mascarenhas, João; Trindade, B.Solid oxide fuel cells (SOFCs) are devices that allow direct conversion of chemical to electrical energy through an electrochemical reaction in a cleaner and more efficient way than conventional processes (eg. gas turbines). They are characterized by the use of a solid oxide material as the electrolyte. Yttria-stabilised zirconia (YSZ) has traditionally been used in SOFCs electrolytes at temperatures in the ran...
The earrings of Pancas treasure: Analytical study by X-ray based techniques – A...
Tissot, Isabel; Tissot, M.; Manso, M.; Alves, L. C.; Barreiros, M. Alexandra; Marcelo, Teresa; Carvalho, M. L.; Corregidor, V.; Guerra, M. F.The development of new metallurgical technologies in the Iberian Peninsula during the Iron Age is well represented by the 10 gold earrings from the treasure of Pancas. This work presents a first approach to the analytical study of these earrings and contributes to the construction of a typological evolution of the Iberian earrings. The manufacture techniques and the alloys composition were studied with three co...