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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...
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...
Development of large area and of position-sensitive timing RPCs
Blanco, A.; Marques, R. Ferreira; Finck, Ch.; Fonte, P.; Gobbi, A.; Mendiratta, S. K.; Monteiro, J.; Policarpo, A.; Rozas, M.Resistive Plate Chambers (RPC) made with glass and metal electrodes forming accurately spaced gas gaps of a few hundred micrometers have reached timing accuracies below 50 ps [sigma] with efficiencies above 99% for MIPs. This type of detector, operating at atmospheric pressure with non-flammable gases, seems well suited for large TOF systems, providing performances comparable to the scintillator-based TOF techn...
Simulation Of Domain-Wall Dynamics In The 2d Anisotropic Ising-Model
Ferreira, A. L. C.; Mendiratta, S. K.; Lage, E. S.The authors first show that the movement of a domain wall in a highly anisotropic Ising model of spins in two dimensions can be mapped to a random walk movement of labelled walkers in one dimension. This movement is correlated in the sense that the transition probability of a given walker, labelled i, depends upon the current positions of its labelled neighbours (i-1 and i+1). A Monte Carlo simulation of the wa...
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