Encontrados 13 documentos, a visualizar página 1 de 2
Influence of seismic activity on the atmospheric electric field in Lisbon (Port...
Silva, H.G.; Oliveira, M.M.; Serrano, C.; Bezzeghoud, M.; Reis, A.H.; Rosa, R.N.; Biagi, F.In the present study, we considered the influence of seismic activity on the atmospheric electric field recorded at Portela meteorological station (Lisbon, Portugal) for the period from 1955 to 1991. To this end, an exploratory method was developed, which involved the selection of events for which the distance from the atmospheric electrical field sensor to the earthquake epicenter is smaller than the preparati...
TWO DECADES OF EARTH SCIENCE RESEARCH
Silva, A.M.; Araújo, A.A.; Reis, A.H.; Morais, M.; Bezzeghoud, M.In 2012, the Évora Geophysics Centre (CGE) celebrates 20 years of activity. In these two decades, the national scientific system underwent a profound transformation, new organizational structures appeared, and participation in structures and international networks, and scientific integration reached very high levels. The national scientific environment is now more qualified and competitive; however the availabl...
Physics of Seismo-electromagnetic Phenomena
Silva, Hugo Gonçalves; Bezzeghoud, Mourad; Borges, J.F.; Bento, C.; Moita, P.; Serrano, C.; Reis, A.H.; Rosa, R.N.; Tlemçani, M.; Biagi, P.F.The seismo-electromagnetic phenomena (SEMG) are integrated in a relatively recent research field that studies diverse phenomena such as: unusual seismo-electrical signals [1], abnormal ultra-low-frequency (ULF) seismo-electromagnetic emissions [2], very-low-frequency (VLF) and low-frequency (LF) radiobroadcast anomalies associated with ionosphere perturbations [3], variation of total electron content of the ion...
Atmospheric electrical field suppression in the time of the M =4.1 Sousel earth...
Silva, Hugo Gonçalves; Serrano, C.; Reis, A.H.; Bezzeghoud, Mourad; Rosa, R.N.; Borges, J.F.; Caldeira, B.; Tlemçani, M.In recent years different phenomena associated with seismic events have been referred in the literature. These include: unusual ultra-low-frequency electromagnetic emissions [1]; anomalies in very-low and low-frequencies radio transmissions [2]; variation of the ionosphere total electron content [3]; and anomalous levels of different geochemical elements (in particular radon) in the earthquake preparation zone ...
Climate change, in the framework of the constructal law
Clausse, M.; Meunier, F.; Reis, A. H.; Bejan, A.Here we present a simple and transparent model of thermal behavior under time-changing conditions. We show the one-to-one relationship between changes in atmospheric properties and time-dependent changes in temperature and its distribution on Earth. The model accounts for convection and radiation, thermal inertia and changes in albedo () and greenhouse factor (). The constructal law is used as the principle ...
Jornadas de Física por ocasião da jubilação do Professor Rui Namorado Rosa
Silva, A.M.; Reis, A.H.; Fitas, A.; Figueiredo, J.; Caldeira, B.; Bezzeghoud, M.Foreword This book is a tribute to Professor Rui Manuel Vassalo Namorado Rosa at the end of his career as a distinguished Professor of Physics of the University of Évora. Al- though Professor Rui Rosa’s main work has focused on research and academic activi- ties, in particular as Vice-Rector and Chairman of the Scientific Council of the Uni- versity of Évora, his rich curriculum vitae encompasses many other act...
SEISMO-ELECTROMAGNETIC PHENOMENA IN TECTONICALLY ACTIVE REGIONS
Silva, H.G.; Bezzeghoud, M.; Biagi, P.F.; Tlemçani, M.; Rosa, R.; Reis, A.H.; Salgueira, M.A.; Caldeira, B.; Borges, J.F.; Manso, M.This work presents a research plan that aims to monitor seismo-electromagnetic signals in seismic active regions. Two effects will be considered: electromagnetic field emissions and radio broadcastings. Our study will be focused in the analysis of low magnitude earthquakes almost completely disregarded in literature. We aim to collect novel seismo-electromagnetic emission data emerging from seismic activity. We...
Special Issue “The Changing Energy Paradigm, Challenges and New Developments”
Reis, A. H.; Miguel, A. F.The worldwide scarcity of fossil fuels regarding primary energy demand together with growing environmental concerns have raised new challenges to the world economy, and led to changes in the energy paradigm. Industry, services, researchers, and the Academy are challenged to envisage new solutions through setting up new conversion processes, designing new power systems, and investigating and developing new energ...
Special Issue “Sustainable Energy Sources and Developing Clean Energy Technolog...
Reis, A. H.; Miguel, A. F.Energy and sustainability are issues in the global agenda. The concern for the impacts of energy use, which adds to the alarm for the scarcity of primary sources of energy, has triggered new research on sustainable primary energy sources and on c1ean and efficient energy systems and processes. Due to the current global warming, the link between energy and environment became inescapable in such a way that resear...
Influence of flow with suspended particles on temperature fields and convective...
Aydin, M; Reis, A. H; Miguel, A. F.The present paper reports the results of a numerical study of forced convection heat transfer between two plates filled with particles. We study the influence of particles suspended in flows on heat transfer enhancement. We consider steady-state fluid flow between two flat horizontal parallel plates with both plates kept at the same temperature. Mono-disperse particles with low and high thermal conductivities i...
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