Browsing by Author "Lopes, A."
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- Avaliação nutricional e sensorial de variedades regionais de pomóideas.Publication . Andrade, Sérgio; Teixeira, Luís; Figueiredo, Catarina; Guiné, Raquel; Lopes, A.; 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 variedades comercializadas verifica-se que as variedades regionais estudadas 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 dois anos consecutivos, não revelam variações expressivas para algumas propriedades químicas.
- Espaços distópicos e heterotópicos no romance A Costa dos Murmúrios de Lídia Jorge: Desconstrução do discurso salazarista, face às práticas subjacentes à Guerra Colonial.Publication . Lopes, A.; Ferreira, Z.; Sardo, A.; Cardoso, Ana PaulaA Costa dos Murmúrios, de Lídia Jorge, dá-nos uma perspetiva da guerra colonial assente numa ótica pouco habitual, a ótica feminina. Onde estiveram e o que fizeram as mulheres portuguesas como Eva Lopo – e outras ainda mais desafortunadas – durante a Guerra Colonial portuguesa? De que forma é que o sonho megalómano da construção de uma utopia nas “províncias ultramarinas” viria a revelar-se, na realidade, como um emaranhado de distopias e heterotopias? Na verdade, o termo heterotopia, elaborado pelo filósofo francês Michel Foucault, na sua conferência Des espaces Autres (1994), concita-nos, desde logo, a problematizar o papel do espaço na formação dos conceitos de subjetividade/alteridade, convocando reflexões sobre a natureza da dialética das relações entre centro e margem, que desencadeiam/podem desencadear situações de diáspora, hibridismo, territorialização/desterritorialização,enraizamento/desenraizamento, etc. À luz destas reflexões procuraremos interpretar algumas das consequências da Guerra Colonial, quer para a mulher, quer, de forma ainda mais devastadora, para as populações autóctones, que foram subjugadas, forçadas, desde os primórdios da colonização, a aculturar-se a um modo de vida que lhes foi imposto, à sua revelia, pelos povos colonizadores.
- Influence of different parameters on the characteristics of hazelnut (var. Grada de Viseu) grown in PortugalPublication . Ferrão, Ana Cristina; Guiné, R. P. F.; Ramalhosa, E.; Lopes, A.; Rodrigues, C.; Martins, H.; Correia, Paula"Grada de Viseu” is an indigenous hazelnut variety from Portugal, and it is considered by the producers as the most important variety in terms of production and productivity. Therefore, the aim of this study was to assess the in fl uence of harvest year ( 2017/2018/2019 ) and location of production ( Viseu/Faia ) on some physical and chemical properties of the variety “ Grada de Viseu, ”namely biometric parameters, colour, true and bulk densities, texture parameters ( hardness and friability ) , and chemical composition. The results showed that the fruitsof the samples harvested in 2019 had higher values of height, width, and thickness. Hazelnuts from 2018 had a clearer shell, independently of the location of production, but only the samples from Faia harvested in 2018 had a clearer kernel. As for the texture, the fruits grown in Viseu harvested in 2018 had a harder shell and was more resistant to fracture, whereas the sample from 2019 had a harder kernel. In all cases, fat was the major chemical component. The sample from 2019 had a water activity greater than 0.62, meaning that its stability was not guaranteed. “ Grada de Viseu ” from Faia in 2018 presented a higher induction period and, therefore, was the one with the highest oxidation stability. The year of production showed to be the best predictor for almost every chemical and biometric characteristics. In general, it was possible to verify that harvesting year and geographical location in fl uence hazelnut characteristics.
- A Study on the Sealing Efficiency of Air Curtains: 2D and 3D ApproachesPublication . Goncalves, J. C.; Costa, J.; Figueiredo, R.; Lopes, A.In industrial refrigerated spaces, such as retail stores, where sometimes doors must be open for long periods, the infiltration loads can represent more than half of the total refrigeration load. The use of air curtains can significantly reduce the air infiltration through doorways and, at the same time, it allows the free access by persons and equipment [1]. Besides the experimental research, computational fluid dynamics (CFD) has been commonly used, either adopting a two dimensional (2D) approach [1] or, more recently, through a three-dimensional (3D) perspective [2,3]. This work presents a numerical and experimental study on the performance of air curtain devices in the aerodynamic sealing of access doors of refrigerated spaces. For this propose, a 3D numerical model was developed aiming at the simulation of the turbulent non-isothermal airflow generated by the air curtain since the moment the door is opened. The calculation domain represents a laboratory scale model consisting of two similar adjacent rooms connected by a doorway over which the air curtain device is installed. One of these rooms represents a refrigerated chamber and the other, the outdoor environment. The numerical study was carried out using a commercial CFD code (ANSYS-CFX) and the turbulence effects were approached by k-_SST turbulent model. In the experimental study, the tracer gas technique was used to estimate the air exchange rate through the doorway in the initial period of the transient process and consequently assess the sealing effect obtained with the air curtain device operating at different jet velocities. The numerical results show that the air curtain simulated is appropriate to protect the doorway in its whole width, and a good agreement is verified with the experimental measurements. Results of a simplified 2D approach are also shown and compared with the 3D simulation