Encontrados 9 documentos, a visualizar página 1 de 1
Performance Degradations due to Crosstalk in Multiwavelength Optical Networks U...
P. S. André; J. L. Pinto; A. Nolasco Pinto; T. AlmeidaThe impact of homodyne and heterodyne crosstalk on an optical signal passing through an optical add drop multiplexer (OADM) node in dense wavelength division multiplexing (DWDM) network is studied, and the analytical expressions for the power penalty are obtain. The statistical impact of crosstalk on signal is studied by simulation and the results compared with experimental data. ;...
Synthesis of esters derived from [4-(2-hydroxy-ethyl)-[1,2,3]triazol-1-YL-2,3,4...
Silva, Marília E.; Pinto, T.; Hrdina, R.; Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana Paula2,3,4-Tri-O-benzyl-alpha-D-methylglucoside was prepared and reacted with several acids: benzoic, phenylacetic, 2-(3-bromo-propoxy)-benzoic, acetylsalicylic and 4-(toluene-4-sulfonylamino)-benzoic. The products were isolated with low to fair yields and fully characterized by usual analytical techniques
Decomposition of intumescent coatings: comparison between numerical method and ...
Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.Passive fire protection materials insulate steel structures from the effects of the elevated temperatures that may be generated during fire. They can be divided into two types, non-reactive, of which the most common types are boards and sprays, and reactive, being intumescent coatings an example. They are available as solvent or water based systems applied up to approximately 3[mm]. One problem associated with ...
Decomposition of intumescent coatings: comparison between numerical method and ...
Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.An investigation of two different intumescent coatings used in steel fire protection has been performed to evaluate their efficiency. A set of experimental tests is presented. They were conducted in a cone calorimeter, considering different thicknesses and heat fluxes. Among other quantities, the steel temperature and the intumescence thickness variation were measured. A numerical model for the paint decomposit...
Determinação da conductividade térmica efectiva de tintas intumescentes
Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.Este trabalho apresenta um estudo experimental e numérico efectuado em placas de aço protegidas com tinta intumescente e sujeitas a um fluxo de calor radiante proveniente de um calorímetro de cone. A variação da temperatura em ambas as faces da placa é obtida através de termopares do tipo k soldados à placa. Os resultados permitem caracterizar o comportamento térmico do intumescente, estimar a expansão volumétr...
Numerical estimation for intumescent thermal protection using one-dimensional IHCP
Mesquita, L.M.R.; Piloto, P.A.G.; Vaz, M.A.P.; Pinto, T.Intumescent coatings are an important group of passive fire protection materials, representing about one third of steel fire protection costs. This insulating system is made of four different chemical compounds that can be classified as: a carbonisation agent, an acid source, a foaming agent and a catalyst. When protecting a steel structure under fire conditions, the intumescent paint is heated, beginning to me...
Separation of solutes with different diffusivities in a hybrid membrane cell co...
S.I.S. Pinto; T.M.G.T.Rocha; J.M. Miranda; J.B.L.M. CamposA hybrid separation membrane cell comprising semi and fully-permeable membrane sections is employed to fractionate solutions containing a solvent and two solutes, namely BSA and dextran. The separation technique takes advantage of the difference between diffusivities of the solutes. The semi-permeable membranes are permeable to the solvent and impermeable to both solutes and the fully-permeable membranes are pe...
Epilepsia e educação pública
Simonatto,D.; Dias,M. D.; Pinto,T. H. B.; Albuquerque,M.Foi elaborado questionário para obter informações sobre as atitudes pessoais e o conhecimento geral sobre as epilepsias. Foram submetidos a esse questionário professores de primeiro e segundo graus de escolas particulares e públicas, bem como professores universitários de áreas médica e não médica, num total de 97 pessoas, restringindo-se à região da Grande São Paulo. Não foram observadas diferenças nos resulta...
The first assessment of hepatitis E virus seroprevalence in northern Portugal.
Macedo, G; Unidade de Gastrenterologia, Hospital de S. João, Faculdade de Medicina do Porto.; Pinto, T; Sarmento, J A; Vale, A M; Ribeiro, THepatitis E is an enterically transmitted acute viral hepatitis, etiologically associated with a recently characterized virus, the hepatitis E virus (HEV). Outbreaks mainly occur in developing countries and as sporadic cases in endemic regions. The authors present the first serological assessment in northern Portugal to assess the presence of anti HEV IgG, using the Elisa test, the EIA and HEV Abbott, in sample...
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