Browsing by Issue Date, starting with "1990"
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- A importância da Ria Formosa no ciclo biológico de Solea senegalensis Kaup 1858, Solea vulgaris Quencel 1806, Solea lascaris (Risso, 1868) e Microchirus azevia (Capello, 1868)Publication . Andrade, José Pedro; Arruda, L. M.Existe actualmente unanimidade sobre a posição de relevo que a Ria Formosa asssume entre as formaçOes lagunares da costa portuguesa. Este aspecto resulta não só da importância económica das inúmeras actividades aí desenvolvidas, mas também encerra razões de índole cientifica que têm atraído, de modo crescente, a atenção da comunidade científica internacional.
- Música tradicional no Algarve: abordagem e análise comparativaPublication . Raimundo, Helder Faustino; Vieira, DanielA partir da experiência acumulada ao longo de uma dezena de anos, na recolha de lições de música tradicional em vários concelhos do Algarve, reflecte-se a sua importância no contexto da etnomusicologia e do folclore do país.
- A quantitative comparison of edge-preserving smoothing techniquesPublication . du Buf, J. M. H.; Campbell, T. G.Edge-preserving smoothing techniques are compared by considering a test image which contains a central disk-shaped region with a step or a ramp edge against a uniform background. Free parameters are the amplitude of Gaussian noise added, the edge slope and the number of filtering iterations. The quantitative comparison measure is the normalised squared error between the filtered noisy image and the noise-free image, on the uniform image regions and on the transition region separately. The filters considered are analysed with respect to their performance under variations in the free parameters and their computer-time consumption. Results obtained are compared with published data available. © 1990.
- Texture feature performance for image segmentationPublication . du Buf, J. M. H.; Kardan, M.; Spann, M.This paper describes a comparative study of texture features, with particular emphasis on the applicability to unsupervised image segmentation. A benchmark test is introduced in which a set of 20 simple bipartite images, combining different stochastic textures separated by a stochastic boundary, is used for feature extraction and segmentation. The accuracy of the segmentation result, expressed in the mean boundary error, is used as an evaluation criterion. From the seven feature extraction methods tested, the Haralick, Laws and Unser methods gave best overall results. Results obtained also show that direct feature statistics such as the Bhattacharyya distance are not appropriate evaluation criteria if texture features are used for image segmentation. A small experiment on visual boundary tracking revealed that boundary error obtained here are similar to those obtained by machine segmentation. © 1990.
- Gabor phase in texture discriminationPublication . du Buf, J. M. H.The relevance of the local phase information for texture discrimination and image segmentation is studied. Useful local phase information is obtained by unwrapping the phase images which result from the application of 2D Gabor filters, i.e., with both a frequency and an orientation selectivity. The unwrapping method applied is based on phase demodulation, where the global linear phase component in the orientation of the filter is directly measured from the wrapped phase image. Experimental results seem to confirm the importance of the local phase information. © 1990.
- Solid phase non isotopic labelling of oligodeoxynucleotides using 5'-protected aminoalkyl phosphoramidites: Application to the specific detection of human papilloma virus DNAPublication . De Vos, M.J.; Cravador, A.; Lenders, J. P.; Houard, S.; Bollen, A.Phosphoramidites of thymidine or 2'-deoxyinosine, modified in 5' by the addition of an aminoalkylcarbamate function, were prepared. The derivatized nucleotides can be used in automatic DNA synthesis to tag any oligodeoxynucleotide chain and provide a convenient reactive group for labelling with non radioactive reporters. As an example of application, we show the specific detection of Human Papilloma Virus DNA using a biotin-labelled 29-mer oligodeoxynucleotide entirely prepared on solid support.
- O impacto do romanceiro do Algarve no contexto português e peninsularPublication . Raimundo, Helder FaustinoTendo como base o Projecto de Recolha de Literatura Oral Tradicional no Algarve, em particular o registo de espécimes do romanceiro tradicional, salienta-se a presença na nossa região de antigas e valiosas versões ditas e cantadas, apresentando-se alguns exemplos/tipo.
- Simone de Beauvoir no Algarve. Um episódio nas relações luso-francesasPublication . Mesquita, José Carlos VilhenaA visita de Simone de Beauvoir a Portugal incluía uma visita aos seus familiares a residirem em Faro, assim como a realização de uma conferência na delegação da Aliance Française em Faro. A descrição dos pormenores, culturais, políticos e sociais dessa visita constituem o fulcro desta conferência.
- Um falcão no punho – Diário 1: modos de auto-reflexividadePublication . Marques, João MinhotoNeste texto, procura-se compreender a designação de género proposta por Um Falcão no Punho (Diário 1) enquanto mecanismo auto-reflexivo que importa examinar não apenas no contexto desse livro particular, como igualmente no âmbito da obra de Maria Gabriela Llansol.