13 documents found, page 1 of 2
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....
Evidence of earthquake seasonality in the Azores Triple Junction
Lordi, Ana L.; Neves, MC; Custódio, Susana; Dumont, StéphanieThis work presents evidence of seasonal and inter-annual variations of the earthquake occurrence rate in the Azores Triple Junction, on the Mid-Atlantic Ridge (MAR). Annual cycles in microearthquakes are relatively common in intraplate continental regions afected by large hydrological loads, but this is the frst time that earthquake seasonality is recognized near mid-ocean ridges. First, we benchmark the method...
Unveiling the Influence of Carbon Nanotube Diameter and Surface Modification on...
Raquel O. Cristóvão; Barros, RAM; Pinho, JG; Teixeira, LS; Neves, MC; Freire, MG; Joaquim Luís Faria; Santos Ebinuma, VC; Tavares, APM; Claudia G SilvaL-asparaginase (ASNase, EC 3.5.1.1) is an amidohydrolase enzyme known for its anti-cancer properties, with an ever-increasing commercial value. Immobilization has been studied to improve the enzyme's efficiency, enabling its recovery and reuse, enhancing its stability and half-life time. In this work, the effect of pH, contact time and enzyme concentration during the ASNase physical adsorption onto pristine and...
Osteomielite crónica multifocal recorrente: série de 4 casos clínicos tratados ...
Ferraria, N; Marques, JG; Ramos, F; Lopes, G; Fonseca, JG; Neves, MCAim: To report and describe a series of four cases of chronic recurrent multifocal osteomyelitis (CRMO) and to discuss therapeutic options, particularly bisphosphonate therapy. Methods: Retrospective review of four CRMO cases in two Pediatric Units in Lisbon, between 2005 and 2010. Results: Median age of first CRMO symptoms was 11.3 years (range 9-13). The more affected sites were the metaphysis of the long bon...
Growth of cadmium selenide nanocrystals on submicron silica
Neves, MC; Soares, J; Hempelmann, R; Monteiro, T; Trindade, TCadmium selenide nanocrystals were grown over silica surfaces using a one-step synthetic method involving the thermal degradation of the single-molecule precursor [Cd(Se2CNEt2)2], EtQC2H5. The X-ray powder diffraction patterns for the SiO2/CdSe nanocomposites show diffraction peaks consistent with the presence of hexagonal-CdSe. Scanning and transmission electron microscopy show inorganic composite particles fo...
Growth of BiVO4 particles in cellulosic fibres by in situ reaction
Barata, MAB; Neves, MC; Neto, CP; Trindade, TCellulosic fibres were used to obtain well-defined BiVO4 particles using a simple controlled precipitation method; microscopy analysis suggests that the BiVO4 particles grow from nucleation sites located in the cell wall structure and inside the lumen of fibres.
Zinc sulfide nanocoating of silica submicron spheres using a single-source method
Monteiro, OC; Neves, MC; Trindade, TA chemical method to coat submicron silica particles with nanocrystalline zinc sulfide is described. The ZnS nanocoating was obtained by the thermalysis of zinc diethyldithiocarbamate in the presence of morphologically well defined silica particles. The powders obtained were isolated and were characterized by UV/visible optical reflectance, scanning electron microscopy (SEM), transmission electron microscopy (T...
Chemical bath deposition of cerium doped BiVO4
Neves, MC; Lehocky, M; Soares, R; Lapcik, L; Trindade, TThe preparation of Ce doped BiVO4 coatings on glass, by the thermal treatment of aqueous solutions containing a bismuth (III) ethylenediaminetetra-acetate chelate, vanadium (V) and cerium (III) species, is described here. The influence of cerium content on the colour properties of the coating was investigated. The coatings consist on morphological well-defined particles forming dense monolayers.
Preparation of hollow shells of zinc oxide/bismuth(III) vanadate
Neves, MC; Trindade, TThe encapsulation of hollow-ZnO microparticles with the BiVO4 pigment is reported. The crystalline phases present in the composite ZnO/BiVO4 microparticles were investigated by X-ray powder diffraction (XRD) studies and Raman spectroscopy. The micrometric ZnO/BiVO4 particles show morphological characteristics related to the hollow-ZnO particles used as templates.
Easter microplate dynamics
Neves, MC; Searle, RC; Bott, MHP[1] We use two-dimensional elastic finite element analysis, supplemented by strength estimates, to investigate the driving mechanism of the Easter microplate. Modeled stresses are compared with the stress indicators compiled from earthquake focal mechanisms and structural observations. The objective is to constrain the tectonic forces that govern the Easter microplate rotation and to test the microplate driving...