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Estratigrafia e interpretação paleográfica do Cenozóico continental do norte de...

Contaminated water, stream sediments and soils close to the abandoned Pinhal do...

The Pinhal do Souto mine exploited a quartz vein containing uranium minerals, mainly autunite and torbernite. This vein intersects a two-mica granite containing 10 ppm U and uraninite. The mine was exploited underground and produced 93,091 kg U3O8 between 1978 and 1989 and was then closed down. Two dumps were left in the mine area and these are partially covered by natural vegetation. Groundwater and surface wa...

Using conformity control of concrete compressive strength for construction site...

The accomplishment of the required strength class in concrete design is very important to avoid the development of pathologies into the concrete structures. This paper intends to evaluate the design required and the obtained strength classes of the concretes produced in ten different construction sites located in the north of Portugal. The strength classes were determined testing standard specimens. In order to...

Effects of Acute Autonomic Modulation on Atrial Conduction Delay and Local Elec...

Slowed atrial conduction may contribute to reentry circuits and vulnerability for atrial fibrillation (AF). The autonomic nervous system (ANS) has modulating effects on electrophysiological properties. However, complex interactions of the ANS with the arrhythmogenic substrate make it difficult to understand the mechanisms underlying induction and maintenance of AF. AIM: To determine the effect of acute ANS mod...

Assessment of geosites at national scale : inventory of the Iberian Massif Land...

Interpretação dos blocos litorais ocorrentes no Pliocénico a leste de Leiria (P...

Foram estudados blocos que atingem 2 metros de diâmetro, constituídos por arenito silicioso ou doleritos, que se encontram na área do sinclinal de Pousos (a leste de Leiria), estratigraficamente atribuíveis à transição Zancliano-Placenciano. Interpretamos a génese dos blocos siliciosos a partir da erosão litoral de arenitos siliciosos da Formação de Bom Sucesso e os de rocha básica a partir de doleritos, durant...

Optical dating of clastic deposits generated by an extreme marine coastal flood...

Identification of past tsunamis is important for risk assessment and management of coastal areas. Obtaining accurate and precise ages of sediments originating from such extreme marine coastal floods is crucial for a reliable estimation of the recurrence interval of these often devastating events. We present here the results of quartz optical dating and 14C dating of two sites (Boca do Rio and Martinhal) on the ...

Geoarchaeology of Pleistocene open-air sites in the Vila Nova da Barquinha-Sant...

This paper aims to provide insight into human occupation and landscape change during the Pleistocene in a central area of the Lower Tejo basin (Portugal). Detailed geomorphological mapping, coupled with lithostratigraphy, sedimentology and luminescence dating, supports the identification of a complete terrace staircase sequence. It consists of six gravely terraces located below the culminant (Pliocene) basin un...

NEW SEISMIC SOURCE ZONE MODEL FOR PORTUGAL AND AZORES FOR USE IN SHARE: METHODO...

The development of seismogenic source models is one of the first steps in seismic hazard assessment. In seismic hazard terminology, seismic source zones (SSZ) are polygons (or volumes) that delineate areas with homogeneous characteristics of seismicity. The importance of using knowledge on geology, seismicity and tectonics in the definition of source zones has been recognized for a long time. However, the defin...

NEW SEISMIC SOURCE ZONE MODEL FOR PORTUGAL AND AZORES

The development of seismogenic source models is one of the first steps in seismic hazard assessment. In seismic hazard terminology, seismic source zones (SSZ) are polygons (or volumes) that delineate areas with homogeneous characteristics of seismicity. The importance of using knowledge on geology, seismicity and tectonics in the definition of source zones has been recognized for a long time [1]. However, the d...