52 documents found, page 1 of 6
Muography in the university and in the museum
Afonso, L.; Alexandre, I.; Andringa, S.; Assis, P.; Blanco, O.; Bezzeghoud, M.; Borges, J.; Caldeira, B.; Cazon, L.; Costa, J.; Dobrilla, P.; Duarte, M.The LouMu team joins together specialists in particle detectors and in cosmic ray analyses, geophysicists and science communicators to muograph an underground gallery of an old mine, now open to visitors of a science museum. The muon telescope is made of Resistive Plate Chambers (RPCs) developed to operate stably and with low consumption at remote locations, and it has been tested in the Coimbra University, bef...
Muography for Underground Geological Surveys: Ongoing Application at the Lousal...
Teixeira, P.; Afonso, L.; Andringa, S.; Assis, P.; Bezzeghoud, M.; Blanco, A.; Borges, J. F.; Caldeira, B.; Cazon, L.; Dobrilla, P.; Lopes, L.The use of muons for geophysical surveys has been proved successful in numerous projects around the planet. The use of muography in an underground environment has an easy side, when compared to the surface, due to the absence of the background radiation. On the other hand, the muon flux is much lower than what is measured on the surface. Geological and underground conditions should be considered when defining t...
High-density Seismic Network for Monitoring Alentejo Region (Portugal) and Miti...
Manso, M.; Bezzeghoud, M.; Borges, J. F.; Caldeira, B.; Fontiela, J.; Ayadi, A.The seismic sensor network Alentejo (SSN-Alentejo) developed by the Earth Sciences Institute (Instituto de Ciências da Terra, University of Évora) brings the largest high-density seismic sensor network ever deployed in Portugal. This novel network aims to improve the characterization of seismic activity in the region, through a high-resolution mapping of seismic clusters and known faults. Over the next two year...
GPR Clutter Reflection Noise-Filtering through Singular Value Decomposition in ...
Oliveira, R. J.; Caldeira, B.; Teixidó, T.; Borges, J.Usually, in ground-penetrating radar (GPR) datasets, the user defines the limits between the useful signal and the noise through standard filtering to isolate the effective signal as much as possible. However, there are true reflections that mask the coherent reflectors that can be considered noise. In archaeological sites these clutter reflections are caused by scattering with origin in subsurface elements (e....
Consolidating efficacy of diammonium hydrogen phosphate on artificially aged an...
Sena da Fonseca, B.; Ferreira Pinto, A.; Piçarra, S.; Caldeira, B.; Montemor, M. F.The effects induced by diammonium hydrogen phosphate (DAP) on coarse marble varieties susceptible to granular disintegration as consolidation material is still poorly addressed. The work aims at investigating the behavior and efficacy of diammonium hydrogen phosphate(DAP)-based consolidant prepared in labo- ratory onto weathered coarse-grained marbles and, in the process, to unveil if the treatment investigated...
Exploring the Consistency of Data Collected in Archaeological Geophysics: A Cas...
Pro, C.; Caldeira, B.; Tena, M. T.; Charro, C.; Oliveira, R. J.; Borges, J.; Mayoral, V.Different geophysical methods applied at the settlement of Villasviejas del Tamuja (Botija, Spain) have identified robust anomalies located at the same position, but some anomalies are reflected by only one method. Furthermore, analysing the spatial correlation of these anomalies is of fundamental importance for obtaining a correct archaeological interpretation. In this work, we analysed the main results of ele...
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...
Aplicação de métodos geofísicos em Arqueologia: desenvolvimento de metodologias...
Oliveira, Rui Jorge; Neves, S.; Caldeira, B.; Teixidó, T.; Borges, J. F.The use of geophysical methods applied to Archaeology, in the exploration of buried structures in the sub-surface, is an imperative need in the previous steps to excavations or archaeological surveys, playing an important role in the delimitation of archaeological sites, making it more effective protective actions archaeological heritage. With regard to planning an archaeological exploration, geophysical method...
Desenvolvimento de Metodologias eficazes de Prospeção Geofísica Aplicadas a dif...
Oliveira, Rui Jorge; Neves, S.; Caldeira, B.; Borges, J. F.; Teixidó, T.O presente trabalho pretende identificar estruturas arqueológicas enterradas no povoado de Outeiro do Circo (Mombeja, Beja), cruzando dois métodos de prospecção geofísica: georradar e magnetometria. Para concretizar o objectivo da missão realizaram-se ensaios dos dois métodos em áreas distintas. O processamento dos dados registados permitiu identificar estruturas enterradas, nomeadamente os vestígios da muralha...
Velocity model estimated from seismic refraction survey and MASW, at Flamengos ...
Neves, S.; Borges, José Fernando; Casacão, J.; Caldeira, B.; Bezzeghoud, MouradThe aim of this communication is to present the velocity models of propagation of seismic waves P and S using geophysical methods, such as refraction surveys and MASW (Multichannel analysis of surface waves). After determining the velocity models, the results were compared for the same location, with the lithology of the island. These results provide important physical parameters used for a near surface charact...