78 research outputs found
Colloquium Romanum. Atti del XII Colloquio internazionale di micenologia, Roma, 20-25 febbraio 2006
No full textVibrational and environmental effects on NLO responses of molecular systems: what we can learn from a two-state model
No full textUnderstanding the properties of molecular materials for NLO is an obvious prerequisite for their use in advanced applications. But a proper modeling of these systems is challenging: their large optical nonlinearity implies large and non-linear responses to several interactions besides applied electric fields, spoiling standard (linear) perturbative approaches to electron-vibration (e-ph) coupling and/or to environmental effects. The Holstein donor-acceptor dimer is a simple two state model, that, relevant to push-pull chromophores, contains he main ingredients to understand non-linearity in molecular materials. Exact solutions of the coupled e-ph problem are easily obtained for this toy-model and are used to test several common approximation schemes for the calculation of NLO responses. The non-linearity of the interaction between electronic and slow degrees of freedom shows up with the anharmonicity of the exact potential energy surfaces relevant to the ground and excited state, as well as with a large dependence of electronic properties on slow coordinates. Anharmonic corrections, negligible in vertical (coherent) linear and non-linear processes, are prominent in incoherent non-linear processes and are responsible for the large amplification of static NLO responses as due to the coupling of electronic an bosonic degrees of freedom. The dependence of the electronic dipole moments and polarizabilities on slow coordinates shows up with non-Condon effects in coherent processes, that are responsible for the large infrared and Raman intensity of the coupled vibrational modes, as well as for the opening of new vibrational channel contributions to NLO processes, with no counterpart in linear spectroscopy
Old symbols and new cults. A piece of female attire from the Trapeza sanctuary near Aigion
No full textAn analysis of the role of liking on the memorial response to advertising
No full textEnThe paper addresses the question of how liking mediates the advertising effect onto recall both on short and long run, jointly modelling the patterns of recall and liking to ad pressure, by means of the specification of a vector autoregressive model with GRPs acting as exogenous variable. The analysis is carried out for the Italian markets of shampoo and small automobile, and for each market the results are summarized performing a logistic regression. The approach is very innovative since literature has investigated until now only the simultaneous relationship between advertising and liking. The results show that recall and liking are linked in a dynamic way, with feedback effects in both directions
Kykladika from Kannia near Mitropolis (Crete)
No full textA marble fgurine of Cycladic type and a fragment of a Kampos bottle were discovered in the excavation carried out
at Kannia, near Mitropolis, in 1958. Tese two objects, and four obsidian blades (very probably Melian in origin) testify that
the site – known for its Final Neolithic I-II pottery – was probably also frequented during the Early Minoan IB. Moreover,
they indicate the spread of Cycladic-related artefacts also in central-southern Cret
Disintegrazione verticale delle piccole imprese dell'industria meccanica in Emilia Romagna
No full textIl contributo analizza l'impatto di outsourcing, disintegrazione verticale e globalizzazione sull'organizzazione dell'industria meccanica dell'Emilia-Romagna. La disponibilità dei dati degli studi di settore permette l'approfondimento dal lato delle piccole e medie imprese e dei sub-contraenti, fornendo una descrizione delle principali trasformazioni del "modello emiliano" intervenute fino ai primi anni Duemila
Uno spillone in bronzo iscritto da Antas (Fluminimaggiore) e la più antica iscrizione in Cipriota “Classico” (?)
No full textLo studio dei correlati di metabolismo cerebrale nella fisiopatologia del disturbo ossessivo-compulsivo: stato attuale e prospettive
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