10 documents found, page 1 of 1
Editorial: Challenges in seismology to our understanding of volcanic islands an...
Fontiela, J.; Silveira, G.; Dias, N.A.; Pimentel, A.; Ramalho, R; Sigloch, KVolcanic islands are some of the most intriguing geological features on Earth, yet the processes that lead to their formation and evolution remain largely enigmatic. Such islands exhibit complex, heterogeneous and anisotropic subsurface structures, characterized by pronounced and abrupt changes in seismic velocities, attenuation, anisotropy, and interfaces. Volcanic islands are amongst the planet’s largest and ...
Pegmatite fields of São Pedro de Ferros, Antônio Dias and Marilac, Minas Gerais...
Soares, D.; Silveira, G.; Castro, I.; Assis, I.; Leles, L.; Mancini, M.; Carlos, D.; Costa, Raphael Vicq Ferreira; Valente, T.; Leão, L.Pegmatites are rocks of granite or metastatic origin with gigantic crystals that are formed in fluid phase of the magmatic liquid enriched with incompatible elements, thats why they can be considered as gemstones and industrial minerals deposits. Both studied areas in the present article were genererated by anatexia process or partial fusion. The Jatobá Mine in the Pegmatitic Field of Ferros-Antônio Dias, in Sa...
On the external forcing of global eruptive activity in the past 300 years
Le Mouël, J-L.; Gibert, D.; Courtillot, V.; Dumont, S.; de Bremond Ars, J.; Petrosino, S.; Zuddas F. Lopes, P.; Boulé, J-B.; Neves, MC; Custódio, S.The decryption of the temporal sequence of volcanic eruptions is a key step in better anticipating future events. Volcanic activity is the result of a complex interaction between internal and external processes, with time scales spanning multiple orders of magnitude. We review periodicities that have been detected or correlated with volcanic eruptions/phenomena and interpreted as resulting from external forces....
The Portuguese National Seismic Network —Products and Services
Carrilho, F.; Custodio, S.; Bezzeghoud, M.; Oliveira, C. S.; Marreiros, C.; Vales, D.; Alves, P.; Pena, A.; Madureira, G.; Escuer, M.; Silveira, G.Portugal, located in the southwest region of the Eurasian plate, has been affected by several destructive earthquakes throughout its history, the most well-known being the 1755 Great Lisbon earthquake. The seismicity of the territory, both in the mainland and in the Azores and Madeira islands, has prompted the continuous development of seis- mic monitoring, from the first known macroseismic inquiry, following t...
Increasing genetic variability in black oats using gamma irradiation
Silveira, G.; Moliterno, E.; Ribeiro, G.; Costa, P.M.A.; Woyann, L.G.; Tessmann, E.W.; Oliveira, A.C.; Cruz, C.D.The black oat (Avena strigosa Schreb) is commonly used for forage, soil cover, and green manure. Despite its importance, little improvement has been made to this species, leading to high levels of genotypic disuniformity within commercial cultivars. The objective of this study was to evaluate the efficiency of different doses of gamma rays [ ^60 Co] applied to black oat seeds on the increase of genetic variabil...
Selfing confirmation in sugarcane by using simple sequence repeat markers: an i...
Costa, P.M.A.; Almeida, C.F.; Silveira, G.; Soares, B.; Baffa, D.C.F.; Peternelli, L.A.; Bhering, L.L.; Barbosa, M.H.P.Superior inbred clones selected in S1 families can integrate an individual reciprocal recurrent selection program in sugarcane by eliminating the genetic load of the population and exploring superior hybrid combinations. Molecular markers can be used for reliable identification of the true selfing-derived clones in these S1 populations. The objective of this study was to confirm true self-fertilized individuals...
The role of PI3K/AKT pathway in cell proliferation and apoptosis in oral Squamo...
Silveira, G.
Avaliação empírica do sucesso da utilização da gestão ágil de projetos no desen...
Vianna, E.; Silveira, G.; Brito e Abreu, F.As abordagens ágeis vêm conquistando cada vez mais praticantes, mas as evidências sobre a real contribuição dessas abordagens para o sucesso dos projetos ainda são escassas. Este artigo corrobora a existência de fatores ágeis contribuintes para o sucesso de projetos de software, por meio de uma pesquisa de campo, de natureza descritiva e quantitativa, com teste de hipóteses. Foi aplicado um questionário aos pro...
Recent improvements in the Broadband seismic networks in Portugal
Caldeira, B.; Carrilho, F.; Miranda, M.; Bezzeghoud, M.; Alves, I.; Silveira, G.; Villalonga, F.; Pena, J.A.Portugal, in spite of the significant earthquake region, (e.g.: Borges et al., 2001) has been operating a limited number of broadband digital seismic instruments. The older BB seismic station in a systematic and continuous operation on the country is MTE, belonging to GEOFON and locally supported by IM, which is working since 1997. To efficiently carry out the task of develop the Broadband Portuguese seismic ne...
C3G - A portuguese collaboratorium for Geology, Geodesy and Geophysics
Caldeira, Bento; Caldeira, Rita; Carrilho, Fernando; Carvalho, João; Custódio, S.; Dias, N.; Fernandes, R.; Moreira, M.; Seixas, T.; Silva, M.