Encontrados 112 documentos, a visualizar página 1 de 12
Viability of wall-embedded tag antenna for ultra-wideband real-time suitcase lo...
Zaric, A.; Matos, V. S.; Costa, J. R.; Fernandes, C. A.WOS:000335152600007 (Nº de Acesso Web of Science) ; Viability of a conformal single-layer monopole antenna is studied for a wall-embedded tag in an ultra-wideband (UWB) suitcase localisation application based on impulse radio UWB. The performance of the embedded antenna is simulated and confirmed experimentally in real-time localisation (RTL) experiments carried out in a cluttered laboratory environment. Evalu...
A Graphical Aid for the Complex Permittivity Measurement at Microwave and Milli...
Silveirinha, M. G.; Fernandes, C. A.; Costa, J. R.WOS:000337131400021 (Nº de Acesso Web of Science) ; We introduce a novel procedure to retrieve the complex permittivity ϵ'-jϵ'' of dielectric materials. It is a variant of the well-known waveguide method, and uses as input the one-port reflection data from a vector network analyzer connected to a short-circuited rectangular waveguide filled with a dielectric sample of known length. Here, it is shown that for l...
Catalisadores derivados de uma argila do Porto Santo: efeito da ativação ácida ...
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Russo, P.A.; Carrott, P.J.M.; Catrinescu, C.; Castilho, P.; Fernandes, C.; Breen, C.No âmbito de um projeto de investigação em curso (PTDC/CTM-CER/121295/2010), materiais derivados de argilas, de várias proveniências e submetidas a diferentes tratamentos de modificação, estão a ser usados como catalisadores em várias reações de interesse, como, por exemplo, na metoxilação do limoneno e na conversão do glicerol. Uma das possíveis vantagens, face a outros catalisadores alternativos, relaciona-se...
Adsorption and pre-adsorption for the detailed characterisation of clay catalysts
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Carrott, P.J.M.; Castilho, P.; Catrinescu, C.; Fernandes, C.; Breen, C.Ion exchange and acid activation are easy and appropriate modification treatments for obtaining versatile clay derived catalysts which can be tailored for a precise reaction of interest. Depending on the specific conditions and also on the nature of the starting clays, the alterations in the porosity and the surface chemistry that occur can be determinant for the catalytic performance, in particular for selecti...
Porosity of clay catalysts for biomass conversion: a comparative study
Ribeiro Carrott, M.M.L.; Cansado, I.P.P.; Castilho, P.; Carrott, P.J.M.; Catrinescu, C.; Fernandes, C.; Breen, C.A detailed description of the porosity, in particular of microporosity, was reported and allowed a clear comparison of the effects on the porosity of chemical treatments on clays from the Source Clays Repository (USA) and SD clay from Porto Santo (Portugal).
Selective methoxylation of limonene over ion-exchanged and acid-activated clays
Catrinescu, C.; Fernandes, C.; Castilho, P.; Breen, C.; Ribeiro Carrott, M.M.L.; Cansado, I.P.P.In this study, we report the use of clay-based catalysts in the methoxylation of limonene, for the selective synthesis of terpinyl methyl ether. Na-SAz-1, Ca-SWy-2 and Sap-Ca source clays and a montmorillonite (SD) from Porto Santo, Madeira Archipelago, Portugal were modified by (i) ion-exchange with Al, Fe, Ni and Na and (ii) acid activation, to produce catalysts with markedly different acidic and textural pr...
Visita à antiga mina de sulfuretos, Lousal
Matos, João Xavier; Pereira, Zélia; Relvas, Jorge M. R. S.; Pinto, A.; Fernandes, C.; Barreira, FilipeBrochura técnica do Projecto Atlanterra - Interreg Espaço Atlântico
Case for Diagnosis
Maio, P; Afonso, A; Cabeçadas, J; Fernandes, C; Sachse, F; Cardoso, JBlastic plasmacytoid dendritic cell tumor is a rare, highly aggressive systemic neoplasm for which effective therapies have not yet been established. We describe a 73-year-old man with multiple nodules and patches emerging on the trunk and limbs. Lesional skin biopsy revealed a plasmacytoid dendritic cell tumor with dense dermal infiltrate of tumor cells with blastoid features. No apparent systemic involvement ...
Coexistência de Morfeia, Vitíligo e Diabetes Auto-Imune Latente do Adulto
Laureano, A; Fernandes, C; Cardoso, JCerca de 30% dos adultos com morfeia apresentam simultaneamente outras doenças auto-imunes, o que suporta a presença de mecanismos de auto-imunidade na patogénese desta doença fibrosante da pele e tecidos subjacentes. Os autores descrevem o caso de um doente do sexo masculino, 27 anos, que notou o aparecimento na região abdominal,cerca de 1 ano antes da observação, de placa eritematosa, ovalada, endurada,assint...
Flexural response of HSC girders strengthened with non- and prestressed CFRP la...
Fernandes, P.; Sena-Cruz, José; Fernandes, C.; Silva, Patrícia; Costa, Daniel Dias da; Júlio, EduardoAn experimental programme was carried out to characterise the flexural response of prestressed highstrength concrete (HSC) girders strengthened with CFRP laminates. For that purpose, four beams with 20 m span were subjected to four-point bending loads and the effectiveness of two distinct strengthening strategies was analysed. The following testing situations have been considered: one girder was externally stre...
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