7 documents found, page 1 of 1

Improvement of the quality of recycled concrete aggregate subjected to chemical...

The main factor that alters the quality of recycled concrete aggregate (RCA) is the paste adhered to the natural aggregate (NA). Since it causes weakening of the interfacial transition zone (ITZ) between the aggregate and the cementitious paste, it becomes a determining factor for the mechanical behavior of concrete. It turns out that it is critical to enhance this interface by improving the surface of the aggr...

Do Mito à Realidade. A Batalha de Aljubarrota - 14 de Agosto de 1385. "A Histór...

A coupled numerical-experimental approach for bender-based G0 measurements in g...

Bender elements are shear wave transducers, used for the experimental identification of the small-strain shear moduli of geomaterials. They offer good coupling with the sample and controllable loading signal and frequency, but the interpretation of their readings poses considerable difficulties. This study lays the foundations for a coupled, numerical-experimental approach to this issue, using hybrid-Trefftz fi...

Bender-based G0 measurements: A coupled numerical–experimental approach

Bender elements are shear wave transducers, widely used for the experimental identification of the small-strain shear moduli of geomaterials. They offer good coupling with the sample and controllable loading signal and frequency, but some of their design and signal interpretation features are still under investigation. The research of these features has been approached mainly on experimental grounds and, in mos...

MRI (1.5 and 3 Tesla) sequence optimization for use in Orthopaedics

Contexto: Existe, actualmente, uma incessante necessidade por exames imagiológicos melhores e mais rápidos no campo da Ressonância Magnética Imagiológica (RMI) clinica. Isto é particularmente verdade em RMI músculo-esquelética (MSK), na qual longas listas de espera são um problema constante. Para além disto, fundos para adquirir ou actualizar equipamentos imagiológicos encontram-se totalmente ou parcialmente co...

Small strain stiffness of sand under different isotropic and anisotropic stress...

This paper presents a study of a uniform dry sand compacted by the pluviation method and submitted to different isotropic and anisotropic stress paths. The stress states were performed in two distinct triaxial cells using specimens of 100 mm and 150 mm diameter in order to assess also the scale-effects. The small strain stiffness for each stress state was evaluated in both triaxial cells by bender elements whic...

Baía de todos os santos: aspectos humanos

A presente obra foi pensada em dois volumes. O primeiro, intitulado Baía de Todos os Santos: aspectos oceanográficos, foi lançado em 2009. Para a organização deste segundo volume, Aspectos Humanos, foi convidado o antropólogo Carlos Caroso que, junto com a Profª. Fátima Tavares e o Prof. Cláudio Pereira, contribuiu para uma reflexão nos modos de pensar e agir a Baía de Todos os Santos. Dividido em três eixos te...