Browsing by Author "Silva, Marco"
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- Influence of storage conditions on the physicochemical, sensory and microbiological characteristics of hazelnuts: preliminary resultsPublication . Ferrão, Ana Cristina; Guiné, Raquel; Silva, Marco; Correia, Paula
- Influência das condições de conservação nas características físico-químicas, sensoriais e microbiológicas de avelãsPublication . Ferrão, Ana Cristina; Guiné, Raquel P. F.; Silva, Marco; Correia, PaulaEste trabalho focar-se-á na influência das condições de armazenagem nas características das avelãs cultivadas na região Centro de Portugal, de forma a potenciar a sua eficiente utilização, minimizar perdas pós-colheita e salientar as suas propriedades, assim como o seu contributo para a nutrição humana. Primeiramente serão analisadas três variedades de avelã (Grada de Viseu, Tonda de Giffoni e Butler) atendendo a parâmetros físico-químicos, caracterização sensorial e microbiológica. Posteriormente, serão realizados vários ensaios de conservação de avelãs, variando as condições de armazenagem (temperatura, humidade relativa e o tipo de embalagem). A monitorização das alterações nos frutos terá por base os mesmos testes que se realizaram para a caracterização de variedades, exceto a avaliação biométrica. Por fim, serão avaliadas as propriedades das avelãs após um processo de transformação, a torra. Com este estudo pretende-se, assim, aprofundar os conhecimentos sobre as boas práticas pós-colheita da avelã, diminuindo o seu desperdício, o que consequentemente permitirá aumentar a produtividade e o rendimento deste setor.
- Intelligent Electric Vehicle Charging ControllerPublication . Gonçalves Cardoso, Filipe; Rosado, J.; Silva, Marco; Teixeira, C. J. Coelho; Agreira, C. I. Faustino; Caldeira, Filipe; Baptista, Pedro; Barreto, Francisco; Pereirinha, Paulo G.Abstract—For domestic consumers, electricity tariffs usually have two components: one is related to the maximum available current/total power (billed in C/day) and the other concerns to the energy consumption (C/kWh). The main switchboard current is usually limited, according to the contracted power level, by way of automatic switches. To avoid main switchboard tripping by current limit violation, Electric Vehicle (EV) owners may decide to increase their contracted power (and the energy bill) or to adopt charging strategies that limit the global consumption (EV plus house needs) to the contracted current/power. In this paper, an Intelligent Electric Vehicle Charging Controller (IEVCC), allowing to use the contracted power to the maximum extent, is presented. A set of user configurable parameters can be used to define the controller behavior, in order to prevent a full switch-off. Two versions are described: a single user version that can be used at private houses and a mesh version that can be used in multi apartment buildings, providing information about consumed energy, time of use, costs and past bills.
- Physicochemical and Microbiological Properties of Hazelnuts from Three Varieties Cultivated in PortugalPublication . Ferrão, Ana Cristina; Guiné, Raquel; Silva, Marco; Lopes, Arminda; Correia, PaulaHazelnut is an important crop worldwide, and the characteristics of the fruits are quite variable according to a number of factors, including variety and cultivation conditions, which in turn can vary according to harvest year. This study aimed to investigate some physical and chemical characteristics of three hazelnut varieties grown in Portugal (Grada de Viseu, Tonda di Giffoni and Butler) along two different harvesting years (2021 and 2022). Also, the microbial quality was investigated for its relevance to the conservation of the fruits. The physical properties evaluated were biometric characteristics and colour, the chemical components analysed were moisture, lipids, protein, ash and fibre, and the microbial properties investigated were the microorganisms, moulds and yeasts. The results showed that, generically, statistically significant differences were found between the three varieties under study on several properties investigated. The kernel was confirmed as the lighter part of all hazelnuts, and when comparing between varieties, Tonda di Giffoni presented the lighter fruits in both harvesting years. With respect to weight, the Tonda di Giffoni variety was the lightest in both harvest years. Moisture content was observed to be higher than the recommended limits for two of the samples (Grada de Viseu in 2021: 6.01 ± 0.26 g/100 g and Butler in 2022: 6.02 ± 0.37 g/100 g), although the difference was marginal given that the recommended limit is 6%. Not surprisingly, lipids were the major chemical component, ranging from 66.46 ± 1.67 to 70.14 ± 1.75 g/100 g in 2021 and from 64.38 ± 1.67 to 77.77 g/100 g in 2022. It was further observed that the three varieties presented a satisfactory microbiological quality. Finally, applying factor analysis with principal components and Varimax rotation, a solution that explains 92.8% of the variance was obtained. This study provided information that is relevant for the characterisation and evaluation of variability according to the year of hazelnuts of three varieties cultivated in Portugal.