Encontrados 35 documentos, a visualizar página 1 de 4
On sampling collection procedure effectiveness for forest soil characterization
Castro, Ana Cristina Meira; Meixedo, João Paulo; Santos, Jorge M.; Góis, Joaquim; Bento-Gonçalves, António; Vieira, António; Lourenço, LucianoOne of the most important measures to prevent wild forest fires is the use of prescribed and controlled burning actions as it reduce the fuel mass availability. The impact of these management activities on soil physical and chemical properties varies according to the type of both soil and vegetation. Decisions in forest management plans are often based on the results obtained from soil-monitoring campaigns. Tho...
Forest fires occurrences and burned area in mainland Portugal: preliminary asse...
Castro, Ana Cristina Meira; Bento-Gonçalves, António; Vieira, António; Lourenço, Luciano; Fernandes, Sofia; Nunes, AdéliaPortugal, as well as the Mediterranean basin, is favorable to the occurrence of forest fires. In this work a statistical analysis was carried out based on the official information, considering the forest fires occurrences and the corresponding burned area for each of the districts of the mainland Portugal, between 1996 and 2010. Concerning to the forest fires occurrence it was possible to identify three main re...
Insignificant impact of prescribed fire on surface soil in a Pinus pinaster pla...
Castro, Ana Cristina Meira; Shakesby, R.; Marques, J. Espinha; Santos, N.; Šmid, M.; Meixedo, João Paulo; Teixeira, J.; Chaminé, Helder I.; Doerr, S. H.Following a prescribed fire in a Pinus pinaster forest site located in the north-west Portugal, monitoring of any changes in selected soil characteristics and soil hydrology was undertaken to assess the effects of burning on the following: pH, electrical conductivity, water content, organic carbon and porosity. Thirty plots were established on a regular grid. At each sample plot before and after the fire, sampl...
Soil erosion after forest fires: evaluation of mitigation measures applied to d...
Bento-Gonçalves, António; Lourenço, Luciano; Nunes, Adélia; Castro, Ana Cristina Meira; Ferreira-Leite, FloraThe development and implementation of measures which promote the reduction of the impacts of forest fires on soils is imperative and should be part of any strategy for forest and soil preservation and recovery, especially considering the actual scenario of continuous growth in the number of fires and burnt area. Consequently, with the dendrocaustologic reality that has characterized the Portuguese mainland in r...
Red nacional para el estudio de los incendios forestales y sus efectos en los s...
Bento-Gonçalves, António; Lourenço, Luciano; Vieira, António; Ferreira-Leite, Flora; Castro, Ana Cristina MeiraEm janeiro de 2014, dando seguimento à intenção manifestada em novembro de 2013 no VII Encontro de Geografia Física e Ambiente realizado em Guimarães, a RISCOS (Associação Portuguesa de Riscos, Prevenção e Segurança), criou as condições para a constituição de uma secção/rede temática dedicada ao estudo dos efeitos dos incêndios nos solos - Rede nacional para o estudo dos Incêndios florestais e seus efeitos nos ...
An integrated recycling approach for GFRP pultrusion wastes: recycling and reus...
Castro, Ana Cristina Meira; Carvalho, João P.; Ribeiro, M. C. S.; Meixedo, João Paulo; Silva, Francisco J. G.; Fiúza, António; Dinis, M. L.In this study, efforts were made in order to put forward an integrated recycling approach for the thermoset based glass fibre reinforced polymer (GPRP) rejects derived from the pultrusion manufacturing industry. Both the recycling process and the development of a new cost-effective end-use application for the recyclates were considered. For this purpose, i) among the several available recycling techniques for thermoset based composite materials, the most suitable one for the envisaged application was selected (mechanical recycling); and ii) an experimental work was carried out in order to assess the added-value of the obtained recyclates as aggregates and reinforcement replacements into concrete-polymer composite materials. Potential recycling solution was assessed by mechanical behaviour of resultant GFRP waste modified concrete-polymer composites with regard to unmodified materials. In the mix design process of the new GFRP waste based composite material, the recyclate content and size grade, and the effect of the incorporation of an adhesion promoter were considered as material factors and systematically tested between reasonable ranges. The optimization process of the modified formulations was supported by the Fuzzy Boolean Nets methodology, which allowed finding the best balance between material parameters that maximizes both flexural and compressive strengths of final composite. Comparing to related end-use applications of GFRP wastes in cementitious based concrete materials, the proposed solution overcome some of the problems found, namely the possible incompatibilities arisen from alkalis-silica reaction and the decrease in the mechanical properties due to high water-cement ratio required to achieve the desirable workability. Obtained results were very promising towards a global cost-effective waste management solution for GFRP industrial wastes and end-of-life products that will lead to a more sustainable composite materials industry.
Mix design process of polyester polymer mortars modified with recycled GFRP was...
Ribeiro, M. C. S.; Fiúza, António; Castro, Ana Cristina Meira; Silva, Francisco J. G.; Dinis, M. L.; Meixedo, João Paulo; Alvim, Mário RuiIn this study, the effect of incorporation of recycled glass fibre reinforced plastics (GFRP) waste materials, obtained by means of shredding and milling processes, on mechanical behaviour of polyester polymer mortars (PM) was assessed. For this purpose, different contents of GFRP recyclates, between 4% up to 12% in weight, were incorporated into polyester PM materials as sand aggregates and filler replacements...
A case study on the eco-efficiency performance of a composite processing indust...
Dinis, M. L.; Fiúza, António; Ribeiro, M.C.S.; Alvim, M.R.; Castro, Ana Cristina Meira; Silva, F.J.G.; Meixedo, J.P.; Oliveira, 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 dete...
Causas de incêndios florestais em Portugal continental. Análise estatística da ...
Lourenço, Luciano; Fernandes, Sofia; Bento-Gonçalves, António; Castro, Ana Cristina Meira; Nunes, Adélia; Vieira, AntónioAo longo dos últimos anos, Portugal não tem conseguido travar os incêndios florestais, tanto no que diz respeito número de ocorrências como no que se refere à dimensão das áreas ardidas, sobretudo durante o período estival, quando dominam temperaturas elevadas e a dessecação dos combustíveis gera um ambiente propício à propagação dos incêndios, cuja ignição, em mais de 90% dos casos, tem origem em atos humanos,...
Characterization of soils in an area of prescribed fire
Santos, N.; Šmid, M.; Castro, Ana Cristina Meira; Marques, J. Espinha; Meixedo, João Paulo; Góis, Joaquim; Chaminé, Helder I.; Vivas, A.; Carvalho, E.The prescribed fire is a technique that is often used, it has several advantages. Pedological and hydropedological techniques were tested to assess the prescribed fire changes may cause in soils. This work was performed in Tresminas area (Vila Pouca de Aguiar, Northern Portugal), during February and March 2011. In the present study we applied several techniques. For the field sampling was followed the ISO 10381...
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