Percorrer por autor "Oliveira, L."
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- An approach to creative classroomsPublication . Peres, Paula; Oliveira, L.; Jesus, Ângelo; Silva, A.This article reflects on 13 years of experience lecturing blended learning higher education courses, in the Polytechnic of Porto. The reflection presented in this paper focus on different learning experiences, special on gamification and how it can make learning and evaluation enjoyable. We implement a new learning environment on higher education. Instead of using the time in-class for lectures we gave online lectures to the students using videos, social network, webinars and interactive e-contents and use the time in-class to promote debates, synchronous communication with students from Portugal and Brazil and other interactive learning activities. In each class we also promote learning activities based on the gamification theory. In this article we present a learning model that we are using in our institution that combines face to face sessions and online sessions in a global higher education environment.
- A case study on the eco-efficiency performance of a composite processing industry: evaluation and quantification of potential improvementsPublication . Ribeiro, M.C.S.; Meira Castro, Ana C.; Silva, F.J.G.; Meixedo, JP; Oliveira, L.; Alvim, M.R.; Fiúza, A.; Dinis, M.L.In this study, an attempt was made in order to measure and evaluate the eco-efficiency performance of a pultruded composite processing company. For this purpose the recommendations of World Business Council for Sustainable Development (WCSD) and the directives of ISO 14301 standard were followed and applied. The main general indicators of eco-efficiency, as well as the specific indicators, were defined and determined. With basis on indicators’ figures, the value profile, the environmental profile, and the pertinent eco-efficiency ratios were established and analyzed. In order to evaluate potential improvements on company eco-performance, new indicators values and eco-efficiency ratios were estimated taking into account the implementation of new proceedings and procedures, at both upstream and downstream of the production process, namely: i) Adoption of a new heating system for pultrusion die-tool in the manufacturing process, more effective and with minor heat losses; ii) Recycling approach, with partial waste reuse of scrap material derived from manufacturing, cutting and assembly processes of GFRP profiles. These features lead to significant improvements on the sequent assessed eco-efficiency ratios of the present case study, yielding to a more sustainable product and manufacturing process of pultruded GFRP profiles.
- Eco-efficiency approaches towards a sustainable composite materials manufacturing industryPublication . Fiúza, António; Ribeiro, M. C. S.; Meira Castro, Ana C.; Silva, F.; Meixedo, JP; Alvim, M.R.; Oliveira, L.In this study the potential eco-efficiency performance of a pultrusion manufacturing company was assessed. Indicators values and eco-efficiency ratios were estimated taking into account the implementation of new proceedings and procedures in the production process of glass fibre reinforced polymers (GFRP) pultrusion profiles. Two different approaches were foreseen: 1)Adoption of a new heating system for pultrusion die in the manufacturing process, more effective and with minor heat losses; and 2) Recycling approach, with partial waste reuse of scrap material derived from manufacturing, cutting and assembly processes of GFRP profiles. These features lead to significant improvements on the sequent assessed eco-efficiency ratios of the present case study, yielding to a more sustainable product and manufacturing process of pultruded GFRP profiles.
- Effect of the pharmaceuticals metformin, escitalopram and furosemide in cyanobacteria growthPublication . Oliveira, L.; Pereira, R.; Costa, J.; Barros, PiedadeWorldwide one of the most prevalent water problems is eutrophication, a result of high nutrient concentration, mainly phosphorus and nitrogen. In freshwater environments, anthropogenic inputs of nutrients and other substances are a major contributing to eutrophication and consequent formation of cyanobacteria and algal blooms. The formation of cyanobacteria blooms can result in toxin production and have ecological and human health impacts. Another emerging water quality concern is the impact of personal care products and pharmaceuticals in the environment. In eutrophic waters the increased availability of pharmaceuticals can interfere with cyanobacteria cells and disrupt or enhance cyanobacteria growth. This study describes the effect of metformine, escitalopram and furosemide in the cyanobacteria Microcystis aeruginosa. Cyanobacteria tests were conducted following the European Guideline (OECD 201) for algal and cyanobacteria growth inhibition test. Cyanobacteria were incubated in microplate with pharmaceuticals solutions prepared in Z8 medium under continuous light and shaking at 22ºC. Results were quantified in terms of average growth rates calculated from cell numbers based on OD determination at 24h period until 120h. Pharmaceuticals used were metformin an anti-diabetic, escitalopram an antidepressive and furosemide a diuretic in ten concentrations. At 120h exposure and at the higher concentration tested the three pharmaceuticals (metformin-10mg/mL; 100% inhibition; escitalopram- 0.1mg/ml; 100% inhibition and furosemide-0.4 mg/mL; 50% inhibition) inhibited Microcystis growth rate. Escitalopram response showed hormesis but at higher concentrations it was more toxic than metformin and furosemide. Time related response was different between pharmaceuticals. The three pharmaceuticals interfere with Microcystis growth rate in different ways.