Search results for " description"
showing 10 items of 192 documents
On the observability of Bell's inequality violation in the two-atoms optical Stern-Gerlach model
2005
Using the optical Stern-Gerlach model, we have recently shown that the non-local correlations between the internal variables of two atoms that successively interact with the field of an ideal cavity in proximity of a nodal region are affected by the atomic translational dynamics. As a consequence, there can be some difficulties in observing violation of the Bell's inequality for the atomic internal variables. These difficulties persist even if the atoms travel an antinodal region, except when the spatial wave packets are exactly centered in an antinodal point.
Microscopic description of α-like resonances
2000
A description of $\ensuremath{\alpha}$-like resonances is given in terms of single-particle states including narrow Gamow resonances in continuum. The equations of motion are derived within the multistep shell-model approach; the lowest collective two-particle eigenmodes are used as building blocks for the four-particle states. A good agreement with the low-lying states in ${}^{212}\mathrm{Po}$ is obtained. A new technique to estimate the $\ensuremath{\alpha}$-particle formation amplitude for any multipolarity is proposed. The spectroscopic factor of the $\ensuremath{\alpha}$-decay between ground states is reproduced, but the total width is by two orders of magnitude less than the experimen…
Cosmological perturbations in extended electromagnetism. General gauge invariant approach
2013
A certain vector-tensor (VT) theory is revisited. It was proposed and analyzed as a theory of electromagnetism without the standard gauge invariance. Our attention is first focused on a detailed variational formulation of the theory, which leads to both a modified Lorentz force and the true energy momentum tensor of the vector field. The theory is then applied to cosmology. A complete gauge invariant treatment of the scalar perturbations is presented. For appropriate gauge invariant variables describing the scalar modes of the vector field (A-modes), it is proved that the evolution equations of these modes do not involve the scalar modes appearing in General Relativity (GR-modes), which are…
Matching stages of heavy-ion collision models
2010
Heavy-ion reactions and other collective dynamical processes are frequently described by different theoretical approaches for the different stages of the process, like initial equilibration stage, intermediate locally equilibrated fluid dynamical stage, and final freeze-out stage. For the last stage, the best known is the Cooper-Frye description used to generate the phase space distribution of emitted, noninteracting particles from a fluid dynamical expansion or explosion, assuming a final ideal gas distribution, or (less frequently) an out-of-equilibrium distribution. In this work we do not want to replace the Cooper-Frye description, but rather clarify the ways of using it and how to choo…
Study of the low-lying collective states in 94–100Mo isotopes using the MAVA
2006
Abstract A systematic investigation of reduced electric quadrupole decay strengths, B ( E 2 ) and level energies of even 94–100 Mo isotopes is performed using the microscopic anharmonic vibrator approach (MAVA). The MAVA is suited for dynamical microscopic description of two-phonon-like states and their energy splitting due to interaction with low-lying one-phonon states. The starting point for the model is a realistic single-particle valence space and a microscopic many-body Hamiltonian which is used to generate the one-phonon states by the use of the quasiparticle random-phase approximation (QRPA). The same Hamiltonian generates also the interaction between the one- and two-phonon states.…
The genus Pleurotus in Italy
2015
On the basis of personal observations, herbarium specimens and, data reported in the literature the authors report morphological, ecological and distributive data on Pleurotus taxa from Italy. New descriptions are here provided based on the most distinctive-discriminating eco-morphological characters of twelve Pleurotus taxa.
Towards an Immersive and Accessible Virtual Reconstruction of Theaters from the Early Modern
2020
This paper reports on the work being done towards achieving an immersive and accessible reconstruction of Historical and Cultural Heritage, focusing on Theaters of the Early Modern as use case. In particular, the paper presents and discusses potential possibilities to enable: 1) the acoustical reconstruction of the virtual (lost) environments – beyond the graphical reconstruction for the buildings, elements and performances; 2) effective interaction features and navigation within the virtual environment (e.g. by means of adaptive interfaces, guiding methods, insertion of Point of Interest); and 3) accessible experiences, by means of an innovative and personalized presentation modes for acce…
PRISMA: towards quality, aspect oriented and dynamic software architectures
2003
The development of software systems must be done using platforms that allow the description of quality, complex, distributed, dynamic and reusable architectural models. We present in this paper PRISMA, an architectural modelling approach based on aspects and components that uses a component definition language (components, connectors and systems) to define architectural types at a high abstraction level and a configuration language to design the architecture of software systems. The component definition language increases reuse allowing importation of COTS and reduces complexity by integrating two modern software development approaches: component-based software development and aspect-orient…
Self-descriptions of socially phobic persons in short-term group psychotherapy
2013
This paper explores how socially phobic persons exhibit their self-images through self-descriptions expressed in a naturalistic group therapy context. The data, which is analysed qualitatively, consists of videotaped therapy sessions, transcribed verbatim, from two groups of individuals (n = 17, mainly women) attending short cognitive–constructive psychotherapy. Seven categories of self-descriptions are found. Three categories –‘self as miserable,’ ‘self as insufficient’ and ‘self as transparent’ – relate to experiential self-images. Four categories – ‘self as adjusting and pleasing others,’ ‘self as demanding toward self,’ ‘self as outsider, different, isolated’ and ‘self as hiding and con…
Implications of the restoration of chiral symmetry in bag model building
1985
We analyze via a bag model description of hadron structure the consequences of having two fundamental scales in QCD, one associated with confinement and the other with chiral-symmetry restration. The main effect is that the exterior pion field becomes weaker and, therefore, we are able to reproduce the axial-vector coupling constant.