Encontrados 6 documentos, a visualizar página 1 de 1
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...
Electromagnetic and acoustic coupling during mechanical action in porous media ...
Silva, Hugo Gonçalves; Graça, M.P.F.; Monteiro, J.H.; Bezzeghoud, Mourad; Rosa, R.N.; Mendiratta, S.K.; Tlemçani, MouhaydineElectromagnetic and acoustic coupling (EAC) during mechanical action, was theoretically predicted to occur in porous media [1] and was recently validated experimentally [2]. In fact, the exchange of acoustic waves to electromagnetic emissions is commonly referred in the literature as seismo-electromagnetic phenomena and is engaging a large number of geophysical groups on its study [3]. The reason for this inte...
Tertiary evolution of the São Vicente and Setúbal submarine canyons, Southwest ...
Alves, T. M.; Gawthorpe, R. L.; Hunt, D.; Monteiro, J. H.The Setúbal and São Vicente canyons are two major modern submarine canyons located in the southwest Iberian margin of Portugal. Although recognised as Pliocene to Quaternary features, their development during the Tertiary has not been fully understood up to date. A grid of 2D seismic data has been used to characterise the sedimentary deposits of the adjacent flanks to the submarine canyons. The relationship bet...
Desempenho vegetativo e produtivo de cultivares e linhagens de soja de ciclo pr...
CÂMARA,G.M.S.; PIEDADE,S.M.S.; MONTEIRO,J.H.; GUERZONI,R.A.Como parte da rede oficial do Estado de São Paulo relativa à competição de linhagens de soja, desenvolveu-se no município de Piracicaba-SP, durante o ano agrícola 1996/97, experimento de campo visando avaliar o desempenho vegetativo e produtivo de linhagens e cultivares de soja (Glycine max L. Merrill) pertencentes ao ciclo de maturação precoce. Delineado em blocos ao acaso com 20 tratamentos (linhagens e culti...
Transient behaviour and rate effects in resistive detectors
Fraga, M. M.; Marques, R. Ferreira; Ivaniouchenkov, Y.; Lima, E. P. de; Neves, F.; Policarpo, A. J. P. L.; C. Bueno, Carmen; Gonçalves, Josemary A. C.The dependence of the detection efficiency (or charge gain) of a resistive detector on the counting rate has been considered by several authors. The influence of the resistivity of the electrodes, the counter geometry and the gas mixture composition have also been studied. Most of those measurements assume a stationary regime. In the present work we report on studies of the transient behaviour of detectors with...
La marge continentale sud-portugaise: évolution structurale et sédimentaire
Mougenot, D.; Monteiro, J. H.; Dupeuble, P. A.; Malod, J. A.The structural and sedimentary evolution of the portuguese continental margin South of Setúbal Canyon is outlined from the study of many seismic reflection profiles and rocks samples. During Triassic and Early Liassic time, a distension affects the Algarve margin that belongs to the Mesogean area. Off Baixo Alentejo rifting phases at Late Jurassic and Early Cretaceous times induced opening or widening of the ad...
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