Pablo Velásquez

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In a previous study, a new ceramic material (Bioeutectic s ), prepared by slow solidification through the eutectic temperaturecomposition region of the wollastonite–tricalcium phosphate system, was found to be bioactive in static-simulated body fluid. The eutectic material reacts by dissolving the pseudowollastonite phase and forming a hydroxyapatite-like(More)
Participation in social sensing applications is challenged by privacy threats. Large-scale access to citizens’ data allow surveillance and discriminatory actions that may result in segregation phenomena in society. On the contrary are the benefits of accurate computing analytics required for more informed decision-making, more effective policies and(More)
Electrodic surfaces of natural chalcopyrite and natural pyrite minerals (El Teniente mine, Chile) have been studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy including microanalysis (SEM/EDX). For comparison, fractured and polished mineral surfaces were(More)
Solubility profiles of uranium dusts in the Irigaray uranium processing plant were determined by performing in vitro solubility tests on breathing zone air samples conducted in all process areas of the processing plant. The dissolution rate of the uranium on the air samples was then determined over the next 28 d in a simulant solution of the extracellular(More)
Yttrium and palladium thin films deposited on glass have been characterized by means of XPS depth profiling, SEM, energy-dispersive x-ray spectroscopy and ultraviolet–visible spectroscopy. These films allow optical windows of variable transparency to be obtained based on the formation of yttrium hydride by hydrogenation, with the palladium film working as a(More)
Sterilization is required for using any material or device in contact with the human body. The aim of this work was to investigate the effect of four sterilization methods (steam autoclave, hydrogen peroxide plasma, ethylene oxide, and gamma sterilization) on the surface chemistry and in vitro bioactivity of pseudowollastonite (psW) coatings in titanium(More)
In this work, 4/spl times/4 organic blue light emitting diode passive matrixes, based on new poli(2,7-fluorene phenylidene) (PFP) derivatives, have been developed. Optical and electrical characterization has been carried out in terms of electroluminescence (EL) and current-voltage (I-V) measurements. Internal devices' parameters, such as carrier injection(More)
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