Encontrados 11 documentos, a visualizar página 1 de 2
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...
Electric transport in different granitic rocks
Silva, Hugo Gonçalves; Graça, M.P.F.; Monteiro, J.S.; Bezzeghoud, Mourad; Rosa, R.N.; Mendiratta, S.K.; Tlemçani, M.; Moita, P.Many studies are being done to understand acoustic to electromagnetic conversion in rocks, [1], mainly because of the so-called seismo-electromagnetic phenomena (SEMG). Nevertheless, to our knowledge, most of them disregard a preliminary analysis of the electrical transport occurring in these rocks. These are, in fact, crucial to understand any electromagnetic process occurring in the materials since they clari...
Exercise Can Improve Speed of Behavior in Older Drivers
Marmeleira, J.; Melo, F.; Tlemcani, M.; Godinho, M.The main aim of this research was to study the effects of a specific exercise program on the speed of behavior of older adults during on-the-road driving. Twenty-six drivers (55–78 yr old) were randomly assigned to either an exercise group or a control group. The exercise program (3 sessions of 60 min/wk for 8 wk) incorporated tasks that induced the participants to respond quickly to challenging situations. On-...
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 ...
Chaotic behaviour of seismic mechanisms: observation and models
Albino, A.; Silva, Hugo Gonçalves; Bezzeghoud, Mourad; Caldeira, B.; Borges, J.F.; Tlemçani, M.Today, it is impractical work modelling the dynamics of failure, given the high complexity of the systems involved. As soon, it is important to identify models, as simples as possible, with qualitatively similar to the failures. The first model introducing is it the mechanical block-spring model, given by Burrigde-Knopoff [1]. In this work the subject was treated by experimental means. For that purpose it was d...
Influence of seismic activity in the atmospheric electrical field in Lisbon (Po...
Silva, Hugo; Serrano, Cláudia; Reis, Heitor; Bezzeghoud, Mourad; Rosa, Rui; Borges, José; Caldeira, Bento; Tlemçani, M.; Biagi, F.The atmospheric electric field (AEF) can be influenced by different factors like cosmic radiation, radioactivity and aerosols [1]. Two innovative works have shown the possibility of enhanced air ionization, with consequent AEF perturbations, in the preparatory stage of earthquakes (EQ): Freund et al. [2] base their arguments on charge separation generated in the stressed volume followed by positive charges flow...
Supressão do Campo Eléctrico Atmosférico aquando do sismo de Sousel, M = 4.1
Silva, Hugo; Serrano, Cláudia; Reis, Heitor; Bezzeghoud, Mourad; Rosa, Rui; Borges, José; Caldeira, Bento; 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; anomalies in radio transmissions; variation of the ionosphere total electron content; and anomalous levels of different geochemical elements (in particular radon) in the earthquake preparation zone. Recent works shown the possibility of en...
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...
Seismo-electromagnetic phenomena in the western part of the Eurasia-Nubia plate...
Silva, HG; Bezzeghoud, M; Biagi, P; Rosa, RN; Silva, MS; Caldeira, B; Reis, AH; Borges, JF; Tlemçani, M; Manso, MThis paper presents a future research plan that aims to monitor Seismo-electromagnetic (SEM) phenomena in the western part of the Eurasia-Nubia plate boundary (WENP). This region has a significant tectonic activity [1] combined with relatively low electromagnetic noise levels and for that reason presents the possibility to perform high quality SEM measurements. Further, it is known that low-frequency [ultra (UL...
Electric properties of granitic rocks
Silva, H.G.; Tlemçani, M.; Albino, A.; Bezzeghoud, M.; Rosa, R.; Caldeira, B.; Borges, J.F.The objective of this work is to clarify the role of water content on the charge trans- port mechanisms of different granitic rocks. The mineralogical content of the rocks will also be taken into account. From the electrical point of view these materials are rather insulating porous media where charge injection creates different phenomena like build-up charges, space charge limited currents, surface effects and...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||