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Multiyear Measurements of the Aerosol Absorption Coefficient Near the Surface i...
Nepomuceno Pereira, Sérgio; Wagner, Frank; Silva, Ana MariaMeasurements of the aerosol absorption coefficient, between 2007 and 2013, were made at the ground level in Évora, a Portuguese small town located in the southwestern Iberia Peninsula. Such a relatively long time series of absorbing aerosols is unique in Portugal and uncommon elsewhere.The average aerosol absorption coefficientwas close to 9Mm−1 and clear cycles at both daily and seasonal time scales were found...
Forest Fire Smoke Layers Observed in the Free Troposphere over Portugal with a ...
Preißler, Jana; Silva, Ana Maria; Wagner, Frank; Nepomuceno Pereira, Sérgio; Guerrero-Rascado, Juan LuisVertically resolved optical and microphysical properties of biomass burning aerosols, measured in 2011 with a multiwavelength Raman lidar, are presented.Thetransportation time, within 1-2 days (or less), pointed towards the presence of relatively fresh smoke particles over the site. Some strong layers aloftwere observedwith particle backscatter and extinction coefficients (at 355 nm) greater than 5Mm−1 sr−1 and...
1st Iberian Meeting on Aerosol Science and Technology - RICTA 2013 PROCEEDINGS ...
Costa, Maria João; Silva, Ana Maria; Guerrero-Rascado, Juan Luis; Pereira, Sérgio; Bortoli, Daniele; Salgado, RuiThis Proceedings Book contains the conference communications (oral and poster) received before the editing deadline and presented at the 1st Iberian Meeting on Aerosol Science and Technology (RICTA 2013), which was held from 1-3 July 2013, in Évora, Portugal. The event was simultaneously the VI Reunión Española de Ciencia y Tecnología de Aerosoles and the IV Summer School on Aerosol Science and Technology, in 2...
Portuguese media discourse on nuclear energy before and after Fukushima: prepar...
Schmidt, Luísa, 1955-; Horta, Ana; Pereira, Sérgio; Oliveira, CarlaThis report presents the results of the analysis of nuclear related content in Portuguese print media. The report is submitted to the first step of the research task untitled Public Discourse about Nuclear Fusion before and after the Fukushima accident, as part of the Socio-Economic Research on Fusion under the general coordination of EFDA Workprogramme 2012.
Comparative Analysis of the public discourse about fusion and nuclear energy be...
Schmidt, Luísa, 1955-; Horta, Ana; Pereira, Sérgio; Oliveira, CarlaThis report presents a comparative analysis of media coverage of fusion and fission energy before and after the accident in the nuclear reactors of Fukushima, Japan. The analysis is based on research conducted under the EFDA Workprogramme 2012, addressing three national-based print media – Germany, Spain and Portugal as well as English-language print media addressing transnational elite.
Electricity cost optimization in a renewable energy
Pereira, Sérgio; Ferreira, Paula Varandas; Vaz, A. Ismael F.The variable electricity output of the renewable energy sources (RES) power plants, such as wind and hydro power technologies, is seen as an important challenge for the electricity system managers. This paper addresses the problem of an electricity system supported mainly on hydro, thermal and wind power plants, presenting a short-term model planning. A binary mixed integer non-linear optimization model for one...
Definição de limites de integração de microgeração nas redes de baixa tensão
Pereira, Sérgio Lima BarrosoTese de Mestrado Integrado. Engenharia Electrotécnica e de Computadores. Universidade do Porto. Faculdade de Engenharia. 2010
A Pulverização da Ammaia
Oliveira, Jorge; Pereira, SérgioNeste texto tenta-se compreender o que terá acontecido à população residente na Cidade de Ammaia edela dependente com o fim do Império Romano. A emergência de vários aglomerados urbanos e sub-urbanos de pequena dimensão na área envolvente da Ammaia parecem reflectir a pulverização da velha urbe.
Short-term scheduling model for a wind-hydro-thermal electricity system
Pereira, Sérgio; Ferreira, Paula Varandas; Vaz, A. Ismael F.This study addresses the problem of the self-scheduling of an electricity system mainly based on hydro, fossil fuel thermal and wind power plants. A binary mixed integer non-linear optimization model is described and applied to short-term electricity planning of a system close to the expected Portuguese one on the year 2020. The model is written in a GAMS code and a global optimization solver is used to obtain ...
Crescimento, produtividade e bienalidade do cafeeiro em função do espaçamento d...
Pereira,Sérgio Parreiras; Bartholo,Gabriel Ferreira; Baliza,Danielle Pereira; Sobreira,Fabricio Moreira; Guimarães,Rubens JoséO objetivo deste trabalho foi avaliar as consequências da redução no espaçamento entre linhas e entre plantas na linha de plantio sobre o crescimento, a produtividade e a bienalidade de produção do cafeeiro (Coffea arabica). Utilizou-se o delineamento experimental de blocos ao acaso, com três repetições, em esquema fatorial 4x3. Foram utilizadas quatro distâncias entre as linhas (2,0, 2,5 3,0 e 3,5 m) e três di...
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