Search results for "Oriente"

La guerra d'Oriente e la minaccia turca nella lirica di metà Cinquecento

2019

Il contributo prende in esame una delle materie più attraversate dalla lirica civile del Cinquecento: la guerra d'Oriente e la minaccia ottomana. Al pari soltanto del motivo del lamento per la decadenza d'Italia, il conflitto contro il Turco genera infatti una ricca proliferazione di rime tra i lirici petrarchisti. Dal punto di vista formale, tali componimenti trovano il proprio archetipo nella canzone petrarchesca O aspectata in ciel, ripresa nel suo schema metrico, nel lessico e nei contenuti. Ma la capacità di rimescolamento di tessere provenienti da luoghi diversi del Canzoniere, propria dell’imitatio petrarchista, genera un’interessante fusione di motivi derivati dall'insieme delle tre…

Negative symptomatology: psychopharmacological strategies and methodological aspects for drug evaluation

1993

Reply: Valproate Treatment in Schizophrenia: Interaction of GABA with Dopamine?

2004

Simple absorbing layer conditions for shallow wave simulations with Smoothed Particle Hydrodynamics

2013

Abstract We study and implement a simple method, based on the Perfectly Matched Layer approach, to treat non reflecting boundary conditions with the Smoothed Particles Hydrodynamics numerical algorithm. The method is based on the concept of physical damping operating on a fictitious layer added to the computational domain. The method works for both 1D and 2D cases, but here we illustrate it in the case of 1D and 2D time dependent shallow waves propagating in a finite domain.

Covariant description of kinetic freeze out through a finite space-like layer

2005

The problem of Freeze Out (FO) in relativistic heavy ion reactions is addressed. We develop and analyze an idealized one-dimensional model of FO in a finite layer, based on the covariant FO probability. The resulting post FO phase-space distributions are discussed for different FO probabilities and layer thicknesses.

Search for newπ0-like particles produced in association with aτ-lepton pair

2014

We report on a search in e^+e^− annihilations for new π^0-like particles produced in association with a τ-lepton pair. These objects, with a similar mass and similar decay modes to π^0 mesons, could provide an explanation for the non-asymptotic behavior of the pion-photon transition form factor observed by the BABAR Collaboration. No significant signal is observed, and limits on the production cross section at the level of 73 fb or 370 fb, depending on the model parameters, are determined at 90% confidence level. These upper limits lie below the cross section values needed to explain the BABAR form factor data.

Studying Indirect Violation of CP, T and CPT in a B-factory

2000

In this work we analyze the observable asymmetries one can build from entangled B-meson states, in order to extract information on the parameters epsilon and delta which govern indirect violation of discrete symmetries. The traditionally proposed observables, based on flavour tags, are not helpful for the study of the Bd-system, where the tiny value of the width difference between physical states clears up such asymmetry effects. Our study makes instead use of CP tags in order to build new asymmetries where the different parameters can be separated out. For this separation, it is decisive to achieve a good time resolution in the measurement of entangled state decays. Nevertheless, even with…

Direct test of time reversal symmetry in the entangled neutral kaon system at a phi-factory

2013

We present a novel method to perform a direct T (time reversal) symmetry test in the neutral kaon system, independent of any CP and/or CPT symmetry tests. This is based on the comparison of suitable transition probabilities, where the required interchange of in out states for a given process is obtained exploiting the Einstein-Podolski-Rosen correlations of neutral kaon pairs produced at a phi-factory. In the time distribution between the two decays, we compare a reference transition like the one defined by the time-ordered decays (l(-), pi pi) with the T-conjugated one defined by (3 pi(0), l(+)). With the use of this and other T-conjugated comparisons, the KLOE-2 experiment at DA Phi NE co…

Novel digital K-edge imaging system with transition radiation from an 855-MeV electron beam

2001

A novel K-edge imaging method has been developed at the Mainz Microtron MAMI aiming at a very efficient use of the transition radiation (TR) flux generated by the external 855-MeV electron beam in a foil stack. A fan-like quasi-monochromatic hard X-ray beam is produced from the /spl plusmn/1-mrad-wide TR cone with a highly oriented pyrolytic graphite (HOPG) crystal. The absorption of the object in front of a 30 mm/spl times/10 mm pn charge-coupled device (pn-CCD) photon detector is measured at every pixel by a broad-band energy scan around the K-absorption edge. This is accomplished by a synchronous variation of the lateral crystal position and the electron beam direction which defines also…

Results of the commissioning of the Pion Beam Factory at SIS/GSI

1999

We describe briefly the Pion Beam Factory recently installed at SIS/GSI and present the main results of the commissioning performed during September 1998.