Browsing by Issue Date, starting with "2008"
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- Avaliação quantitativa do parasitismo intestinal em aves de produção.Publication . Monteiro, L.; Marques, V.; Vala, Helena
- Avaliação Nutricional e Sensorial de Variedades Regionais de Pomóideas, em Modo de Produção Convencional e Biológico.Publication . Guiné, Raquel; Correia, Ana Cristina; Jordão, António; Ferreira, DulcineiaOs resultados obtidos evidenciam, para determinados parâmetros químicos e/ou nutricionais e de textura, diferenças entre algumas das variedades regionais estudadas. Por comparação com as variedades comercializadas verifica-se que as regionais apresentam valores mais elevados, particularmente do teor em fibra dietética e em compostos fenólicos totais. A análise sensorial efectuada permite inferir a existência de algumas variedades regionais nitidamente mais apreciadas do que outras. Por outro lado, as determinações efectuadas a partir de frutos, colhidos em três anos consecutivos, revelam variações expressivas para algumas propriedades químicas.
- NPK farm-gate nutrient balances in dairy farms from Northwest PortugalPublication . Fangueiro, D.; Pereira, J.; Coutinho, J.; Moreira, N.; Trindade, H.Farm-gate nutrient balances (N, P and K) were analysed in three groups of dairy farms from NW Portugal – medium, intensive and very intensive farms – during 3 consecutive years, 2003, 2004 and 2005. Results showed that the N surplus per hectare with values between 200 and 850 kg N ha−1 was positively correlated with the milk production per ha and the stocking rate of the farm, whereas the P and K surpluses showed fewer variations between groups. In all farms the main inputs were the mineral fertilizers and the feed concentrates whereas milk was the main output. Farmers involved in the study were advised in terms of nutrient management and significant decreases in the nutrient surpluses were observed during the 3 years study, mainly due to a decrease of the inputs, namely fertilizers. We conclude that advisory campaigns among farmers are efficient to reduce the nutrient surpluses. The N losses via NH3 emissions at farm scale were also estimated accordingly to IPCC emission factors and it appeared that such losses were significant and had to be considered together with the nutrient surpluses when strategies to enhance nutrient management are defined. On average, higher N surplus per hectare were observed in the studied dairy farms from NW Portugal relatively to other European regions, but NW Portugal present lower N surplus per production unit (kg milk) as well as higher N efficiency. Nevertheless, a target limit of 450 kg N ha−1 for N surplus should be easily reached as a first step by most of the farms of NW Portugal by improving nutrient management at farm scale. However, more efforts will be necessary to reduce NPK surplus and NH3 emissions to the mean values in a per hectare basis found in other European dairy regions with less intensive systems.
- A comunicação nas práticas de jovens professores de MatemáticaPublication . Ponte, João Pedro; Guerreiro, António; Cunha, Helena; Duarte, José; Martinho, Helena; Martins, Cristina; Menezes, Luís; Menino, Hugo; Pinto, Hélia; Santos, Leonor; Varandas, José; Veia, Luciano; Viseu, FlorianoEste artigo visa conhecer o modo como jovens professores, de diversos níveis de ensino, recém diplomados por instituições de formação inicial, orientam a comunicação nas suas aulas, a que aspectos tendem a dar atenção, que dificuldades sentem. Na sua base está um trabalho colectivo realizado por formadores de instituições de ensino superior em Portugal, preocupados em melhorar a qualidade da formação inicial dos professores, em especial no que se refere à Didáctica da Matemática. A metodologia, de natureza qualitativa e interpretativa, envolveu a realização de 12 estudos de caso. Os resultados mostram que a comunicação é vista pelos jovens professores como um suporte de um ambiente geral que poderá favorecer, em termos globais, a aprendizagem. No entanto, são relativamente poucos aqueles que identificam a comunicação como um objectivo curricular importante da disciplina de Matemática e que apontam estratégias consistentes para a promover, tanto na sua vertente oral como na sua vertente escrita. São ainda menos os que apontam a comunicação como um processo fundamental para o desenvolvimento de significados matemáticos por parte dos alunos. Estes resultados sugerem que as instituições de formação podem ter interesse em reflectir sobre as suas práticas de formação neste domínio.
- On the spectra of some graphs like weighted rooted treesPublication . Fernandes, Rosário; Gomes, Helena Margarida dos Santos Vasconcelos; Martins, EnideWe give a complete characterization of the eigenvalues of the Laplacian matrix and adjacency matrix of G. They are the eigenvalues of leading principal submatrices of two nonnegative symmetric tridiagonal matrices of order k × k and the roots of some polynomials related with the characteristic polynomial of the referred submatrices. By application of the above mentioned results, we derive an upper bound on the largest eigenvalue of a graph defined by a weighted tree and a weighted triangle attached, by one of its vertices, to a pendant vertex of the tree.
- A Level-Based Approach to Prioritize Telecommunications R&DPublication . Fialho, Joana; Godinho, Pedro; Costa, João Paulo; Afonso, Ricardo; Regalado, José GonçaloIn this paper, an approach to evaluate R&D projects in telecommunications is presented. These projects have particular features that cannot be properly incorporated by classical valuation methods. This approach incorporates different criteria, both quantitative and qualitative, and also management flexibility and uncertainty. Thus, it is an approach that can be applied to real data of R&D projects in a telecommunications company.
- Contributos do Ensino Recorrente para o desenvolvimento socioeducativo e económico dos jovens e adultos: Um estudo no concelho de Vila Nova de PaivaPublication . Cardoso, Ana Paula; Pereira, Marco DiasAs elevadas taxas de analfabetismo entre certos grupos etários da população portuguesa em idade activa, nomeadamente nas regiões rurais e interiores do país, levou à criação do Ensino Recorrente (E.R.), uma modalidade de educação escolar vocacionada especialmente para a formação de adultos que abandonaram precocemente o sistema escolar e, ainda, para jovens que deixaram os cursos regulares, nomeadamente por razões de ordem laboral. Tendo desenvolvido, entre 1999 e 2004, a actividade profissional no concelho de Vila Nova de Paiva, no sector do E.R. ao nível da educação básica de adultos, 1º e 2º ciclos, procurámos averiguar se a frequência desta valência de educação de adultos trouxe algum contributo para o desenvolvimento socioeducativo e para a melhoria das condições económicas e laborais dos jovens e adultos deste concelho. Através de um estudo exploratório, de carácter descritivo, concluímos que a formação recebida constituiu uma mais-valia para os sujeitos que frequentaram o E.R., na medida em que contribuiu para a melhoria das suas condições de vida, traduzidas no aumento de conhecimentos úteis para o dia-a-dia, no desenvolvimento de comportamentos benéficos para a saúde e prevenção, numa maior consciência cívica, na sensibilizarão pelas questões ambientais, no incremento das condições económicas e da sua situação laboral, em geral.
- A case of mammary gland Carcinoma and Malignant Myoepithelioma on a female dogPublication . Santos, M.; Esteves, F.; Almeida, R.; Vala, HelenaThe mammary gland is the most commonly affected organ for tumours in the bitch. Mammary tumours mainly affect middle-aged and elderly female dogs. In this case report, a 10 year-old female mix breed dog, spayed before first heat, showed to private veterinary practice with two mammary nodules on the right mammary chain. Complete unilateral mastectomy was performed and the formalin-fixed surgical specimen was submitted to pathology service. Routine hematoxylin and eosin histhopathological evaluation was performed. On the 1st abdominal gland, the microscopic exam revealed a well circumscribed, unencapsulated nodule, compatible with lipoma. The 2nd abdominal gland showed a neoplastic spindle cell population, loosely arranged in an abundant myxoid, bluish color matrix with cartilagineous type matrix areas. These cells presented round pale nuclei, increased contour, prominent nucleoli and nuclear pleomorphism. Multinucleated giant cells and high mitotic rate were also seen. Some sections showed epithelial proliferations arranged in a tubulopapillary pattern. Since the myoepithelial component with malignant characteristics predominated as a distinct feature, the diagnosis of carcinoma and malignant myoepithelioma was established, according to Goldschmidt (2007), since this diagnosis was not possible according to previous classifications. As the myoepithelial component is benign in almost all tumours, this is considered a rare lesion in the dog. Goldschmidt M. Classification of canine mammary tumours. 2007 Davis Foundation European Symposium. University of Munich, Germany. 27-29 Aug 2007.
- Pine wood modification by heat treatment in airPublication . Esteves, BrunoMaritime pine (Pinus pinaster) wood has low dimensional stability and durability. Heat treatment was made in an oven using hot air during 2 to 24 h and at 170-200 ºC. A comparison was made against steam heat treatment. The equilibrium moisture content and the dimensional stability (ASE) in radial and tangential directions were evaluated at 35%, 65% and 85% relative humidity. MOE, bending strength and wettability were also determined. At the same mass loss improvements of equilibrium moisture content and dimensional stability were higher for oven heat treatment but the same happened for mechanical strength degradation. A 50% decrease in hemicellulose content led to a similar decrease in bending strength.
- Meaning (de)coding of symbolic experiencesPublication . Barroso, PauloThis article is about a particular and central subject of study within the scope of the conceptual investigations on Aesthetics: the definition of art. I propose an analysis of this question in order to defend the thesis of the impossibility to present a definition of art. According to my perspective, based on Wittgenstein’s latter work, art could be understood like a game: both cannot be defined if we isolate its essential qualities or rules. There is nothing in common to all games as well as there is nothing in common to all works of art. Wittgenstein did not answer to the main question “What art is?”, but he presented the concept “family resemblance” as a metaphor able to be used to give some meaning to words of our ordinary language, like “art” and “game”.