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La música de tradición popular en los cartones de Goya. Escenas, instrumentos, significados

2000

Messaggi di Scienza

2019

Durante SPAIS 2018 è stata esaminata la diversa natura dei segnali che sono veicolo dello scambio di informazione e l’effetto sulle proprietà di sistemi di natura diversa. Si è prestata particolare attenzione alle proprietà che emergono solo in presenza di un numero elevato di unità interagenti mediante esempi in Chimica, Fisica e nelle Scienze Biologiche, Geologiche e Naturali. Si è prestata attenzione anche alle tecniche di rilevazione e analisi di specifici segnali, siano essi di natura elettromagnetica o gravitazionale o relativi a oscillazioni della materia come nel caso di onde sismiche e/o sonore. Coerentemente alla mission di SPAIS, è stato dato anche spazio alle applicazioni a cara…

Prefazione - Messaggi di Scienza

2019

Wannier90 as a community code: new features and applications

2019

Wannier90 is an open-source computer program for calculating maximally-localised Wannier functions (MLWFs) from a set of Bloch states. It is interfaced to many widely used electronic-structure codes thanks to its independence from the basis sets representing these Bloch states. In the past few years the development of Wannier90 has transitioned to a community-driven model; this has resulted in a number of new developments that have been recently released in Wannier90 v3.0. In this article we describe these new functionalities, that include the implementation of new features for wannierisation and disentanglement (symmetry-adapted Wannier functions, selectively-localised Wannier functions, s…

Solar blind AlGaN photodetectors with a very high spectral selectivity

2006

Solar blind detectors based on AlGaN heterostructures grown on sapphire by Molecular Beam Epitaxy and with a dielectric interference filter deposited on the back side are demonstrated to provide record spectral selectivity. Rejection ratios of 2 x 10(4), and better than 5 x 10(4), measured between 280 and 320 nm, are achieved in Metal Semiconductor Metal detectors and Schottky diodes respectively. The whole detector process is fully compatible with low cost array fabrication.

Current modulation induced stability in laser diode under high optical feedback strength

2021

The back-reflection of emitted laser beam (optical feedback, also know as selfmixing) from various external interfaces are sufficient to cause instability, and prohibiting its use in various fields such as communication, spectroscopy, imaging to name a few. So it is desirable to study the laser dynamics and the conditions causing it to be stable in spite of strong optical feedback. With the aid of mathematical formulation, simulation and backed by experimental evidences, it is demonstrated that the frequency deviation of the laser emission due to current (intensity) modulation alters the dynamic state and boundary conditions of the system such that even under large optical feedback strength…

La giustizia internazionale per gross violations di diritti umani tra esigenze retributive e riconciliative

2009

Gabapentin in the treatment of hemifacial spasm

2001

Objectives To evaluate the efficacy of gabapentin in the treatment of hemifacial spasm. Material and methods Twenty-three patients with hemifacial spasm not suitable for surgery or therapy with botulinum toxin were treated with gabapentin. The main efficacy parameter was the percentage of spasm reduction. Results A clinically significant reduction of spasms was obtained by 16 patients. Conclusion Gabapentin was effective and safe in reducing hemifacial spasm in 16 out 23 (69.6%) patients.

CRIS: A new method in isomeric beam production

2013

The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, CERN, uses laser radiation to stepwise excite and ionize an atomic beam for the purpose of ultra-sensitive detection of rare isotopes, and hyperfine-structure measurements. The technique also offers the ability to purify an ion beam that is heavily contaminated with radioactive isobars, including the ground state of an isotope from its isomer, allowing decay spectroscopy on nuclear isomeric states to be performed. The isomeric ion beam is selected by resonantly exciting one of its hyperfine structure levels, and subsequently ionizing it. This selectively ionized beam is deflected to a decay spectroscopy station (DS…

Long-ranged and soft interactions between charged colloidal particles induced by multivalent coions

2015

Forces between charged particles in aqueous solutions containing multivalent coions and monovalent counterions are studied by the colloidal probe technique. Here, the multivalent ions have the same charge as the particles, which must be contrasted to the frequently studied case where multivalent ions have the opposite sign as the substrate. In the present case, the forces remain repulsive and are dominated by the interactions of the double layers. The valence of the multivalent coion is found to have a profound influence on the shape of the force curve. While for monovalent coions the force profile is exponential down to separations of a few nanometers, the interaction is much softer and lo…