36 documents found, page 1 of 4
Crustal Imaging of Portugal Mainland Using Magnetotelluric Data
Baltazar‐Soares, P.; Martínez‐Moreno, F. J.; Ribeiro, J. Alves; Monteiro Santos, F. A.; Ribeiro, P.; Pais, M. A.; Mateus, A.; Pous, J.The comprehensive mapping of resistivities in depth and its interpretation is of great importance to unravel the electrical properties of deep-seated rocks, providing significant insights into the structure of the crust. The first 3D resistivity model for Portugal mainland is here reported using data from 31 broadband MT soundings spaced 50 × 50 km apart. The model shows large crustal volumes with contrasting r...
Gold nanoparticles for forensic application
Almeida Cardoso da Costa, A. C.; Mateus, A.; Fernandes Patrício, T. M.Background: Nanotechnology has grown exponentially over the years, considering the versatility of applications [1]. Metallic nanoparticles present various advantages, highlighting their versatility, low toxicity, high biocompatibility, biodegradability, stability, and low production cost [2–4]. Metallic nanoparticles, such as gold nanoparticles (NPAu), can be used for incorporation in systems due to the colorim...
Preliminary findings from the follow-up of pregnant sickle cell disease patient...
Brito, Miguel; Ginete, Catarina; Ferreira, J.; Delgadinho, Mariana; Sebastião, Cruz; Mateus, A.; Mendes, M.; Quinto, F.; Simão, F.; Fernandes, F.Background: In Angola, the prevalence of Sickle Cell Disease (SCD) is almost 2%, and the carriers reach 21% of the population. Although its presentation tends to be very heterogeneous, chronic hemolytic anemia, frequent painful crises, and extensive organ damage are common features of these patients. Pregnancy in SCD patients is associated with an increase in severe outcomes, namely, a high risk of eclampsia an...
Load sequence effects and cyclic deformation behaviour of 7075-T651 aluminium a...
Branco, R.; Costa, J. D.; Prates, P. A.; Berto, F.; Pereira, C.; Mateus, A.This paper investigates the effect of loading history on cyclic deformation and fatigue behaviour of 7075-T651 aluminium alloy subjected to two-step loading. High-low and low-high sequences, encompassing both symmetrical and asymmetrical steps, are performed under strain-controlled mode for different loading scenarios. An elastic-plastic constitutive model is developed using the finite element method to simulat...
Introdução à química laboratorial no ensino superior: guia de laboratório dirig...
Mateus, A.; Rio, CarolinaAprender o porquê dos perigos, os seus riscos, bem como os procedimentos e processos estabelecidos para proteger os utilizadores do laboratório é a base das regras de segurança. Se percebermos o porquê mais facilmente seguimos os procedimentos de segurança e as respetivas regras. Um perigo é uma fonte potencial de dano. Se os perigos químicos não forem reconhecidos, eventos inesperados, que resultam em feriment...
Cyclic plastic behaviour of 7075 aluminium alloy
Nogueira, F. de Moura; Cunha, J.; Mateus, A.; Malça, C.; Costa, J. D; Branco, R.This paper aims at studying the cyclic plastic behaviour of the 7075-T651 aluminium alloy under fully-reversed strain-controlled conditions. Tests are conducted under strain-control mode, at room temperature, in a conventional servo-hydraulic machine, from smooth samples, using the single step method, with strain amplitudes (/2) in the range ±0.5 to ±2.75%. This material has exhibited a mixed behaviour, i.e. ...
Variscan Metamorphism
Ribeiro, M. L.; Reche, J.; López-Carmona, A.; Aguilar, C.; Bento dos Santos, T.; Chichorro, M.; Dias da Silva, I.; Díez-Montes, A.; González-Clavijo, E.Various segments of Variscan crust are currently exposed in Iberia in response to successive tectonic events during the Variscan orogeny itself and subsequent extensional and compressive events during the Alpine cycle, all accompanied by surface erosion, and collectively contributing to their exhumation. We review the main characteristics and geodynamic contexts of the metamorphic complexes developed in Iberia ...
Cyclic plastic behaviour of 7075 aluminium alloy
Nogueira, F.; Cunha, J.; Mateus, A.; Malça, C.; Costa, J. D.; Branco, R.This paper aims at studying the cyclic plastic behaviour of the 7075-T651 aluminium alloy under fully-reversed strain-controlled conditions. Tests are conducted under strain-control mode, at room temperature, in a conventional servo-hydraulic machine, from smooth samples, using the single step method, with strain amplitudes (∆ε/2) in the range ±0.5 to ±2.75%. This material has exhibited a mixed behaviour, i.e. ...
Variscan Magmatism. In: Quesada C., Oliveira J. (eds) The Geology of Iberia: A ...
Ribeiro, M.L.; Castro, A.; Almeida, A.; Menéndez, L.G.; Jesus, A.; Lains, J.A.; Lopes, J.C.; Martins, M.H.B.; Mata, J.; Mateus, A.; Moita, P.This chapter aims to identify, characterize and locate the main facts/events related to orogenesis in the Iberian Peninsula. Its succession in space and time determines the geodynamic environment of the broader geological phenomenon corresponding to the Variscan cycle. In this sense, this section comprises two parts: I—The Iberian orogenic magmatism seen through a space-time approach of its westernmost region—f...
Variscan Magmatism
Ribeiro, M. L.; Castro, A.; Castro, A.; González Menéndez, L.; Jesus, A.; Lains, J. A.; Lopes, P.; Martins, H. C. B.; Mata, J.; Mateus, A.; Moita, P.This chapter aims to identify, characterize and locate the main facts/events related to orogenesis in the Iberian Peninsula. Its succession in space and time determines the geodynamic environment of the broader geological phenomenon corresponding to the Variscan cycle. In this sense, this section comprises two parts: I—The Iberian orogenic magmatism seen through a space-time approach of its westernmost region—f...