Pietro Giannone

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Hysteresis is a common phenomenon in various non linear systems including piezoceramic materials. Piezoelectric bimorph devices show hysteretic behaviour, when operating as actuators. In this paper an experimental setup to investigate the hysteretic behaviour of a PZT is described. The strategy adopted uses a resistive readout scheme and a CCD tool for the(More)
We investigate distributions of the stellar metallic-ity Z which can solve the local (within the effective radius) and/or the global G-dwarf problem in elliptical galaxies. We represent an elliptical galaxy with the spherical and isotropic model by Hernquist (1990) and relate the Z dispersion to the stellar binding energy E. Such a Z−E relation may be a(More)