28 documents found, page 1 of 3
Designing a Multicriteria WebGIS-Based Pre-Diagnosis Tool for Indoor Radon Pote...
Nunes, Leonel; Curado, António; Azevedo, Rolando; Silva, Joaquim P.; Lopes, Nuno; Lopes, Sérgio IvanRadon (222Rn) is a well-known source of indoor air contamination since in its gaseous form it is a reported source of ionizing radiation that belongs to the group of rare gases. Radon occurs naturally in soils and rocks and results from the radioactive decay of its longer-lived progenitors, i.e., radium, uranium, and thorium. Radon releases itself from the soil and rocks, which mainly occurs in outdoor environm...
Environmental Assessment of the Valorization of Woody Biomass Residues: A Case ...
Simões, Carla L.; Simoes, Ricardo; Gonçalves, A. S.; Nunes, LeonelEvaluating Global Warming Potential (GWP) in waste management scenarios is crucial, especially in light of the escalating global concern for climate change and the pivotal role that waste management plays in mitigating this crisis. This research examines the GWP of three distinct waste management scenarios, each with a unique approach: (1) open burning, a method involving direct combustion with a GWP of 1600.1 ...
Extração de taninos de Acacia sp. com potencial uso na coagulação: um contribut...
Ferreira, Ricardo; D'arc Coura, Renata; Ferraz, Ana; Nunes, Leonel; Rodrigues, A. C.Coagulation-flocculation is one of the most important steps in water treatment. In Water Treatment Plants, pre-polymerized inorganic coagulants are traditionally used; however, recent studies have shown the potential of condensed tannins for the production of natural coagulants as an alternative to chemical coagulants. In this context, the present work intends to highlight the importance of the development of n...
Acacia dealbata Link. Aboveground Biomass Assessment: Sustainability of Control...
Nunes, Leonel; Meireles, Catarina; Pinto Gomes, Carlos; Almeida Ribeiro, NunoInvasive species are an environmental problem affecting worldwide ecosystems. In the case of Acacia dealbata Link., the negative impacts affect the productivity of the forests due to the competition established with native species while contributing to a significant increment in the available fuel load, increasing the risk of fire. In Portugal, chemical and mechanical methods are mostly used in the control of t...
Evolution of land cover in the special area of conservation of Monchique (South...
Raposo, Mauro; Nunes, Leonel; Pinto-Gomes, Carlos JoséThe Natura 2000 Network, as the European Union's ecological network, aims to ensure the long-term conservation of Europe's most threatened species and habitats, helping to stop the loss of biodiversity. Based on this assumption, the changes in land cover in the Special Area of Conservation (SAC) of Monchique between 1995 and 2018 are analysed and related to identify favourable and unfavourable policies concerni...
Prunus lusitanica L.: An Endangered Plant Species Relict in the Central Region ...
Raposo, Mauro; Nunes, Leonel; Quinto-Canas, Ricardo; del Río, Sara; Vázquez-Pardo, Francisco; Galveis, Ana; Pinto-Gomes, CarlosPrunus lusitanica L. is a paleotropical relic species with an Ibero-Maghrebian distribution, which is presently considered as an endangered species, recognized by the Natura 2000 Network (92/43/EEC) as a priority habitat for conservation in Europe. The mountains in the Portuguese mainland central region offer the best location for this species to occur. The main objective of this study is to measure the current...
The Impact of Rural Fires on the Development of Invasive Species: Analysis of a...
Nunes, Leonel; Raposo, Mauro; Meireles, Catarina; Pinto-Gomes, Carlos; Almeida Ribeiro, NunoBiological invasions can affect ecosystems in different ways. Invasive forest species, such as Acacia dealbata Link., affect forests’ productivity, because they compete directly with native species for access to light and nutrients, contributing to the loss of biodiversity. In this study, an area occupied by A. dealbata, located in Casal do Rei (Seia, Portugal) was studied to evaluate the influence of fire in t...
Allometric, Growth, and Biomass Estimation Models for Acacia dealbata Link.: A ...
Nunes, Leonel; Meireles, Catarina; Pinto-Gomes, Carlos; Almeida Ribeiro, NunoAllometric, growth, and biomass estimation models for the quantification of missing parameters in trees are widely used to estimate the productivity of a stand. However, regarding species with lower economic interest, or exotic invasive species, the creation of these tools did not occur in the same way as for other species, lacking the development of relationships to allow a deeper study of these species. Thus,...
A Historical Perspective of Landscape and Human Population Dynamics in Guimarãe...
Nunes, Leonel; Raposo, Mauro; Pinto-Gomes, CarlosThe occupation of a territory combines a set of variables which affect the development of the mode by which populations have been organized throughout history. How this occupation takes place demonstrates much of a territory’s past and shows how the populations managed to make the most out of the available resources. The region of Entre-Douro-e-Minho (Northern Portugal), similarly to what happens in other regio...
Energy Recovery of Shrub Species as a Path to Reduce the Risk of Occurrence of ...
Nunes, Leonel; Raposo, Mauro; Meireles, Catarina; Pinto-Gomes, Carlos; Ribeiro, NunoThe accumulation of biomass fuels resulting from the growth of heliophilous shrubs and small tree species at the edge of forests and on scrub and pasture lands contributes to the increased risk of rural fires in Mediterranean climate regions. This situation has been managed with a set of legislative measures launched with the objective of promoting cleaning and the control of these species. Areas of scrub and p...