13 documents found, page 1 of 2
LDPE-Nanoclay films for food packaging with improved barrier properties
Barros, Carolina; Miranda, Sónia; Castro, Olga; Carneiro, O. S.; Machado, A. V.This study focuses on the development of low-density polyethylene matrix nanocomposite films for food packaging industry and aims at improving low-density polyethylene oxygen barrier properties while maintaining other relevant characteristics, such as processability, easy post-processing, optical and mechanical properties. low-density polyethylene nanocomposites, with 1 and 2.5 wt.% nanoclay (NC) and also compa...
Feminism and translation:: Conceptual and methodological notes for transnationa...
Castro, Olga; Spoturno, María Laura; Florez Valdez , Maria Barbara; Barboza, Beatriz Regina GuimarãesThe main aim of this paper is to offer a comprehensive methodological framework for transnational feminist translation studies from a situated, and thus necessarily limited position. In order to do this, we will frame our research within the era of transnational feminisms, and establish a fruitful dialogue between transnational feminisms and feminist translation studies. The most influential proposals in the fi...
Active Flexible Films for Food Packaging: A Review
Azevedo, Ana G.; Barros, Carolina; Miranda, Sónia; Machado, Ana Vera; Castro, Olga; Silva, Bruno; Saraiva, Margarida; Silva, Ana SanchesActive food packaging is a dynamic area where the scientific community and industry have been trying to find new strategies to produce innovative packaging that is economically viable and compatible with conventional production processes. The materials used to develop active packaging can be organized into scavenging and emitting materials, and based on organic and inorganic materials. However, the incorporatio...
Active flexible films for food packaging: a review
Azevedo, Ana G.; Barros, Carolina Lemos; Miranda, Sónia; Machado, A. V.; Castro, Olga; Silva, Bruno; Saraiva, Margarida; Silva, Ana SanchesActive food packaging is a dynamic area where the scientific community and industry have been trying to find new strategies to produce innovative packaging that is economically viable and compatible with conventional production processes. The materials used to develop active packaging can be organized into scavenging and emitting materials, and based on organic and inorganic materials. However, the incorporatio...
Application of the nZEB methodology in the retrofitting of a typical Portuguese...
Monteiro, Joaquim; Castro, OlgaBuildings and the whole built environment are in a key role when societies are mitigating climate change and adapting to its consequences. More than 50% of the existing residential buildings in EU-25 were built before 1970. Thus, these buildings are of significant importance in reducing energy consumption and CO2 emissions. The existence of more nearly zero energy buildings (nZEB) is a possible solution for thi...
Experimental study on the impact of using a fan coil in the evaluation of conta...
Monteiro, Joaquim; Bathelt, Amadeusz; Castro, OlgaThe aim of this study is to investigate the differences in ventilation efficiency owing to an air supply position and air exhaust locations of an air distribution system in combination with a fan coil. Ten strategies of air diffusion strategies were performed in a test chamber applying the tracer gas techniques. All experiments were performed with a presence of the fan coil. For all the ten strategies 9 rph pro...
Influência do clima e do caudal de ar variável em função da demanda para um sis...
Almeida, Marco; Monteiro, Joaquim; Castro, OlgaNa perspetiva da melhoria da eficiência energética e da QAI dos edifícios de serviços existentes e que são climatizados com sistemas centralizados do tipo tudo-ar, foi desenvolvida uma aplicação informática que permite simular o comportamento dinâmico de situações reais de funcionamento relativas ao tratamento de ar. Com vista à redução do consumo energético associado à utilização dos sistemas técnicos de climat...
Impact of using solar heat pumps for domestic hot water in Portuguese residenti...
Monteiro, Joaquim; Castro, OlgaIn recent years, we have seen an improvement of existing facilities in dwellings in Portugal. Within the heat pumps systems, there is a special type known as direct expansion heat pump assisted by Solar Collector (DX-SAHP). It was calculate the SPF indicator for 30 regions of Portugal. It was analyses the potential of reductions of CO2 and primary energy use for the retrofitting of DHW preparation systems. It w...
The study of the impact of demand controlled ventilation in energy consumption ...
Almeida, Marco; Monteiro, Joaquim; Castro, OlgaThis study presents an implementation of an application, using mathematical models, which allow to create virtual simulations to minimize energy consumption, thereby enabling an optimization of the energy efficiency of air handling equipment. The mathematical model was validated by laboratory experiments. An analysis of variation of the quantity of supply air of the system for three cities in different climatic...
Aplicação da definição nZEB da REHVA a uma renovação de um edifício de habitaçã...
Monteiro, Joaquim; Castro, OlgaOs edifícios desempenham um papel-chave nas sociedades que estão a tentar atenuar os efeitos das alterações climáticas. Mais de 50% dos edifícios residenciais existentes na UE-25 foram construídos antes de 1970. Assim, estes edifícios são de significativa importância na redução de consumo de energia e emissões de CO2. Os edifícios de balanço de energia (quase) zero (nZEB) são uma solução possível para este prob...