Browsing by Issue Date, starting with "2007"
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- Educar para a cidadania: Um projecto de investigação-acção em educação de infânciaPublication . Cardoso, Ana Paula; Pereira, Maria CecíliaPretendemos com este artigo dar a conhecer um trabalho final de Seminário realizado no âmbito do curso de Complementos de Formação de Educadores de Infância, em 2005-06, na Escola Superior de Educação de Viseu (Portugal) e que teve subjacente um projecto de investigação-acção desenvolvido num Jardim-de-Infância da rede pública. A questão central desta investigação foi a de determinar até que ponto a educadora, através da sua prática pedagógica, poderia contribuir para a aproximação no mesmo espaço educativo de crianças oriundas de culturas e etnias diferentes. A reflexão, baseada na autoscopia (autoavaliação feita pela própria das suas práticas pedagógicas) e na heteroscopia (avaliação feita pelos pares), através da observação de gravações vídeo e da utilização de uma grelha de registo de dados, permitiu à educadora questionar as suas atitudes no desempenho profissional, com vista à renovação da sua prática pedagógica.
- Pear drying: Perspectives for convective drying.Publication . Guiné, RaquelThe present study aimed the evaluation of the possibilities of introducing alterations in the method used traditionally to dry pears in Portugal, by direct open-air sun exposure, in order to modernize it, making it possible to be used in an industrial scale, being more profitable and allowing the obtaining of dried pears with a better quality.
- Resultado das técnicas de diagnóstico serológico – método ELISAPublication . Seixas, C.; Santos, C.; Esteves, F.; Albuquerque, T.; Vala, HelenaA primeira abordagem de diagnóstico laboratorial de Paratuberculose ovina consistiu numa pesquisa de anticorpos específicos anti-mycobacterium paratuberculosis através do método ELISA (Enzime Linked Immunosorbent Assay), em amostras de soro sanguíneo recolhidas nos animais das explorações em estudo. A primeira fase do estudo serológico consistiu no rastreio de 20% dos animais das 12 explorações incluídas no estudo. A segunda fase de pesquisa focou-se nas explorações onde se verificaram resultados positivos (10 explorações), sendo rastreados os restantes 80% dos animais. A pesquisa de anticorpos por este método revelou, em 2589 amostras analisadas, a presença de 235 amostras positivas (9,1%) e de 45 duvidosas (1,7%). A técnica ELISA foi aplicada recorrendo a dois kits comerciais existentes no mercado. Todas as amostras foram testadas individualmente com um kit ELISA de “screening”, sendo posteriormente testadas as amostras positivas e duvidosas com um kit ELISA de confirmação. Estas mesmas amostras foram ainda submetidas a análise com a técnica AGID (Agar Gel Immunodiffusion), que consiste igualmente na pesquisa de anticorpos específicos anti-Mycobacterium paratuberculosis, verificando-se a reacção entre o soro da amostra e o PPA (Antigénio Protoplasmático Paratuberculose), usando-se um soro positivo de referência, como termo de comparação. No total de amostras analisadas, observaram-se com esta técnica 30 resultados positivos. Das 12 explorações iniciais, apenas duas não apresentaram resultados serológicos positivos (ELISA ou AGID).
- Pedagogical affect, student interest, and learning performancePublication . Abrantes, José Luís; Seabra, Cláudia; Lages, Luis FilipeUsing a sample of more than 1000 students, this study reveals that students’ perceived learning depends directly on their interest, pedagogical affect, and their learning performance and indirectly on the student–instructor interaction, the instructor's responsiveness, course organization, the instructor's likeability/concern, and the student's learning performance. Likeability/concern indirectly affects student interest by influencing learning performance. The results yield recommendations for schools, department heads, and university administrators.
- Study of the pumpkin convective drying.Publication . Pinho, Susana; Guiné, Raquel; Barroca, Maria JoãoThe aim of this work is to analyse the effect of convective drying on the nutritional properties of fresh and dried pumpkin (Cucurbita máxima). The samples were analyzed in terms of moisture content, total and reducing sugars, acidity, proteins, lipids, crude fiber and ash. The pumpkin was cut into circular slices dried in a ventilated chamber at different temperatures, ranging between 30 ºC and 70ºC. In addition, the kinetic behaviour was also studied in this temperature band. The results enable us to conclude that the fresh pumpkin has a low content of lipids and a high level of water, sugars, protein and crude fiber. This chemical composition, which is an excellent source of nutritive elements, associated with some components with antioxidant activity, which act as a health-protecting factor, make out of pumpkin an excellent food product, whose consumption should be further encouraged. In addition, it is also possible to conclude that, apparently, the convective drying process has no effect on the nutritional characteristics of the pumpkin, except on sugars and acidity. The influence of the operating condition (the temperature) on the drying kinetics was also analysed. The results show that the increase on the operating temperature strongly accelerates the drying process and a constant rate period is not observed. However, in the range of 30 to 70ºC it was observed that there is a similar kinetic behaviour for all the values of temperature tested. The experimental data for the moisture ratio content with time was fitted, using the software Sigma Plot, v8.0 (SPSS, Inc.), to eight different models, and the two that showed a better performance were the Page and modified Page.
- A Ghost Cell-Based Data Structure for Multiresolution MeshesPublication . Rodrigues, Rui; Morgado, José Francisco; Silva, Frutuoso; Gomes, AbelMultiresolution meshes enable us to build representations of geometric objects at different Levels of Detail (LODs). We introduce a multiresolution scheme whose data structure allows us to separately re- store the geometry and topology of a mesh during the refinement process. Additionally, we use a topological criterion (not a geometric criterion, as usual in the literature) to quickly simplify a mesh, what seems to make the corresponding simplification algorithm adequate for real-time appli- cations such as, for example, on-line computer games.
- Influence of steam heating on the properties of pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) woodPublication . Esteves, Bruno; Velez Marques, António; Domingos, Idalina; Pereira, HelenaHeat treatment of Pinus pinaster and Eucalyptus globulus woods, two important species in Portugal, was made in the absence of air by steaming, inside an autoclave, for 2 to 12h at 190 ºC to 210ºC. Mass losses increased with treatment time and temperature reaching 7.3% for pine and 14.5% for eucalypt wood. The wood behaviour with moisture was improved. The equilibrium moisture content decreased by 46% for pine and 61% for eucalypt, the dimensional stability increased (maximum anti-shrinking efficiency in the radial direction of 57% and 90% for pine and eucalypt respectively) and the surface wettability was lowered. In relation to mechanical properties, the modulus of elasticity was little affected (maximum decrease of 5% for pine and 15% for eucalypt) but the bending strength was reduced (by 40% at 8% mass loss for pine and 50% at 9% mass loss for eucalypt wood). The variation of properties was related to treatment intensity and mass loss but significant improvements could already be obtained for a 3-4% mass loss without impairing the mechanical resistance. The response of eucalypt was higher than that of pinewood. Heat treatment of eucalypt wood shows an interesting potential to improve the wood quality for solid timber products.
- Evaluation of α- and β-pinene degradation in the detailed tropospheric chemistry mechanism, MCM v3.1, using environmental chamber dataPublication . Pinho, P. G.; Pio, C. A.; Carter, W. P. L.; Jenkin, M. E.The representation of the degradation of the monoterpenes, α- and β-pinene, in version 3.1 of the Master Chemical Mechanism (MCM v3.1) has been evaluated, using environmental chamber data from the Statewide Air Pollution Research Center (SAPRC) at the University of California. As part of this evaluation, a representation of the reactions of the monoterpenes with O(3P) has also been included, these reactions being significant under chamber conditions but generally insignificant under atmospheric conditions. The results demonstrate that MCM v3.1 provides a consistent description of the photo-oxidation of α-pinene/NOX mixtures for a range of initial VOC/NOX, but with the formation rate of ozone and decay rate of α-pinene generally being overestimated. Sensitivity of the system to parameter uncertainties and mechanistic variations proposed in the literature are described. The collective implementation of a number of refinements allows the simulations to be brought into good agreement with the experimental observations for the complete series of experiments, with each of the refinements being consistent with reported parameter uncertainty ranges or mechanistic adjustments. The system is particularly sensitive to the magnitudes of sources and sinks of free radicals. The impacts of several other reported mechanistic variations which potentially influence the first generation product distribution and the ozone formation chain length of the initial oxidation step are also described and assessed. MCM v3.1 is shown to provide a reasonable, but less consistent, description of photo-oxidation of β-pinene/NOX mixtures. The simulated magnitudes of the ozone formation rates and β-pinene removal rates are broadly comparable with the experimental observations, but the mechanism tends towards overestimation of ozone formation at low VOC/NOX and underestimation at high VOC/NOX. Implementation of a number of mechanistic variations reported in the literature does not allow the associated simulations to be brought into good agreement with the observations for the entire VOC/NOX range. The system is particularly sensitive to changes which influence the formation of HCHO (and resultant radical production upon its photolysis), and the impacts of the tested mechanistic variations are usually dominated by this effect. As a result of this work, gaps and uncertainties in the kinetic, mechanistic and chamber database for the monoterpenes are identified and discussed.
- O património e o turismo: cidade de LamegoPublication . Isabel, Vieira; Francisco, Sande LemosO aumento constante da procura turística tem dado origem a que, cada vez mais, os recursos patrimoniais sejam transformados em recursos turísticos. Assistimos, por isso, hoje em dia e um pouco por todo o mundo, a um aumento da oferta do produto cultural e patrimonial. Esta evolução justifica que os locais que possuem recursos patrimoniais tenham de se preocupar com o modo como a gestão é realizada. A tendência actual da gestão do património vai no sentido de uma colaboração, cada vez mais estreita, entre as áreas do Património e o Turismo, com o objectivo de delinearem estratégias conjuntas. Através da investigação bibliográfica, tivemos oportunidade de verificar que existem vários estudos sobre o património, em geral, mas são escassos os que se referem ao património arquitectónico e sua relação com os visitantes, principalmente, no caso de Portugal. O estudo que aqui se apresenta, “O Património e o Turismo: Cidade de Lamego”, pretendeu compreender a gestão do património e a sua relação com os visitantes. Com este objectivo, elaborou-se um questionário que foi aplicado aos visitantes, num total de 234 indivíduos, durante os meses de Outubro e Novembro de 2005. Aplicou-se, também, um questionário, já validado, aos gestores do seguinte património: Sé Catedral, Igreja de Almacave, Santuário da Nossa Senhora dos Remédios, Castelo, Museu, e Capela de São Pedro Balsemão. Através do cruzamento dos dados recolhidos nos dois questionários, foi possível inferir que a relação existente entre quem gere o património e os seus visitantes é, ainda, deficiente ou muito deficiente. A maior falha apontada pelos visitantes, tendo em conta os problemas ligados à gestão, prende-se com a falta de interpretação dos monumentos. Os resultados deste estudo, bem como as propostas e sugestões elaboradas, poderão ser úteis para as instituições responsáveis pela preservação e valorização do património, na medida em que chamam a atenção dos seus gestores para os problemas que existem, apontando caminhos, que poderão eventualmente contribuir para a resolução de alguns desses problemas.