86,793 research outputs found
Valse impromptu : pour piano / par F. Cataliotti-Valdina ; [ill. par] L. Pousthomis
No full textTitre uniforme : Cataliotti-Valdina, F. (18..-19.. ; compositeur). Compositeur. [Valse-impromptu. Piano. Mi bémol majeur]Valses (piano) -- +* 1900......- 1999......+:20e siècle:Piano, Musique de -- +* 1900......- 1999......+:20e siècle
TUMORI ANDROGENIZZANTI DEL CORTICO-SURRENE IN ETA' PEDIATRICA: Descrizione di un caso
No full textGli Autori descrivono un caso di tumore virilizzante del corticosurrene in un bambino da loro osservato. Vine descritto l'iter diagnostico-terapeutico
A new technique for temporary pulmonary exclusion during bronchopulmonary surgical procedures in children.
No full textDetection of weak stochastic forces in a parametrically stabilized micro-optomechanical system
No full textMeasuring a weak force is an important task for micromechanical systems, both when using devices as sensitive detectors and, particularly, in experiments of quantum mechanics. The optimal strategy for resolving a weak stochastic signal force on a huge background (typically given by thermal noise) is a crucial and debated topic, and the stability of the mechanical resonance is a further, related critical issue. We introduce and analyze the parametric control of the optical spring, which allows us to stabilize the resonance and provides a phase reference for the oscillator motion, yet conserving a free evolution in one quadrature of the phase space. We also study quantitatively the characteristics of our micro-optomechanical system as detector of stochastic force for short measurement times (for quick, high-resolution monitoring) as well as for the longer-term observations that optimize the sensitivity. We compare a simple strategy based on the evaluation of the variance of the displacement which is a widely used technique) with an optimal Wiener-Kolmogorov data analysis. We show that, due to the parametric stabilization of the effective susceptibility, we can more efficiently implement Wiener filtering, and we investigate how this strategy improves the performance of our system. We finally demonstrate the possibility to resolve stochastic force variations well below 1% of the thermal noise.MicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
"Highly anomalous group velocity of light in ultracold rubidium gases"
No full textDilute rubidium gases at submicrokelvin temperatures offer the possibility of exceptionally small and negative group velocities. We devise an experimental scheme in which nearly dispersionless and highly superluminal pulse propagation at optical frequencies can be observed. Comparisons with other schemes and potential applications are briefly discussed
CONTRIBUTO CLINICO AL GRANULOMA EOSINOFILO DELLE OSSA IN ETA' PEDIATRICA
No full textGLI aUTORI ESAMINANO IL QUADRO CLINICO ED ANATOMO-PATOLOGICO DEL GRANULOMA EOSINOFILO DELLE OSSA E DESCRIVONO QUATTRO CASI OSSERVATI IN ETA' PEDIATRIC
LA SINDROME DA IPOPERISTALTISMO NEL NEONATO. A proposito di un caso clinico associato a malrotazione, intestino corto, malassorbimento
No full textViene descritto un caso di una Sindrome caratterizzata da ipopèeristaltismo, intestino corto, malassorbiment
Squeezing a Thermal Mechanical Oscillator by Stabilized Parametric Effect on the Optical Spring
No full textWe report the confinement of an optomechanical micro-oscillator in a squeezed thermal state, obtained by parametric modulation of the optical spring. We propose and implement an experimental scheme based on parametric feedback control of the oscillator, which stabilizes the amplified quadrature while leaving the orthogonal one unaffected. This technique allows us to surpass the ?3??dB limit in the noise reduction, associated with parametric resonance, with a best experimental result of ?7.4??dB . While the present experiment is in the classical regime, in a moderately cooled system our technique may allow squeezing of a macroscopic mechanical oscillator below the zero-point motion.MicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
ESPLORAZIONE ULTRASONOGRAFICA dello SCROTO. Ruolo Diagnostico ed Implicazioni Terapeutiche in Età Pediatrica
No full textUltrasonography of the scrotal contents was used to identify 41 patients with testicular disease
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