This article describes methods for high stability oscillators design using quartz crystal piezoelectric proprieties. It also presents a set of radio frequency oscillators whose construction principles obey to these methods. ; Este artigo descreve técnicas de projecto de osciladores de elevada estabilidade recorrendo às propriedades piezoeléctricas do cristal d...
This paper present a prototype of an Application to visualize data from pottery found in a XVth century shipwreck in the Aveiro lagoon.This application was developed in VRML 2.0 and allows the tridimensional exploration of the relative position of thedifferent pottery pieces as well as the access to some other information concerning each piece of pottery. ; Este artigo apresenta um prot&oac...
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