Search results for "Rossi"

Anomalous diffusion and nonlinear relaxation phenomena in stochastic models of interdisciplinary physics

2020

The study of nonlinear dynamical systems in the presence of both Gaussian and non-Gaussian noise sources is the topic of this research work. In particular, after shortly present new theoretical results for statistical characteristics in the framework of Markovian theory, we analyse four different physical systems in the presence of Levy noise source. (a) The residence time problem of a particle subject to a non-Gaussian noise source in arbitrary potential profile was analyzed and the exact analytical results for the statistical characteristics of the residence time for anomalous diffusion in the form of Levy flights in fully unstable potential profile was obtained. Noise enhanced stability …

La imágen de la ópera en la historia de la pintura: : Delacroix y el Otello de Rossini

2013

An Exact Solution for the Level-Crossing Rate of Shadow Fading Processes Modelled by Using the Sum-of-Sinusoids Principle

2008

Published version of an article in the journal: Wireless Personal Communications. The original publication is available at Springerlink. http://dx.doi.org/10.1007/s11277-008-9512-3 The focus of this paper is on the higher order statistics of spatial simulation models for shadowing processes. Such processes are generally assumed to follow the lognormal distribution. The proposed spatial simulation model is derived from a non-realizable lognormal reference model with given correlation properties by using Rice's sum-of-sinusoids. Both exact and approximate expressions are presented for the level-crossing rate (LCR) and the average duration of fades (ADF) of the simulation model. It is pointed …

A Theoretical Study on the Low-Lying Excited States of 2,2′:5′,2′′-Terthiophene and 2,2′:5′,2′′:5′′,2′′′-Quaterthiophene

2005

The nature and properties of the low-lying singlet and triplet valence excited states of 2,2':5',2-terthiophene (terthiophene) and 2,2':5',2:5,2'-quictterthiophene (tetrdthiophene) are discussed on the basis of high-level ab initio. computations. The spectrascopic features determined experimentally for short α-oligothiophenes are rationalised on theoretical grounds. Special attention is devoted to the nonradiative decay process through intersystem crossing (ISC) from the singlet to the triplet manifold, which is known to be relatively less efficient in tetrathiophene. Along the geometry relaxation of the S 1 state of terthiophene, the S' 1 and T 2 states become degenerate, which leads. to a…

La ricostruzione del soffitto della chiesa dell'Ospedale di San Lazzaro dei Mendicanti

2004

Analyse de la digitalisation du canal de distribution : une approche triadique dans l’étude du risque de désintermédiation des grossistes traditionne…

2020

Intermediaries are little studied in Management Science. The research proposes to put forward a particular type of intermediary that is the wholesaler. Faced with the digitization of all sectors, it is interesting to question the capacity of wholesalers to generate added value in the distribution channel. Based on the triadic methodology and the field of study, it turns out that digital can modify one of the inter-organizational relational processes. In the absence of a strong demand for downstream distribution channels, wholesalers are struggling to put in place a digital strategy that makes sense. On the other hand, this delay allows the industrialist to take the lead on information flows…

The Influence of the Digitalisation of the Distribution Channel in the Process of Bypassing Wholesalers: The Case of a Distribution Triad

2022

• ObjectivesThe wholesaler, a traditional player in distribution, has been going through a new phase in its evolution over the last twenty years. Driven by the digitalisation of activities, upstream and downstream players are trying to bypass it and new players such as commercial platforms are appearing. In order to understand this phenomenon, this research analyses how the wholesaler manages to keep a part of the flows between the actors of the distribution channel.• MethodA qualitative analysis by individual interviews within the building materials sector highlights the appropriation of informational flows by manufacturers leading to the phenomenon of partial disintermediation which affec…

Resistance of traditional wholesalers: a dichotomy of flows within the distribution channel

2020

The wholesaler has often been threatened with the risk of disintermediation both upstream and downstream of the distribution channel. Wholesalers, in their role as intermediaries, remain established in many sectors. The Internet has also generated a current of re-intermediation via digital platforms. The article starts from the premise that wholesalers are always essential players in the distribution channel and increase their value proposition through services and digital. As part of a qualitative study in the French market for the sale of building materials, an interesting phenomenon emerged. It is the partial disintermediation of wholesalers for the benefit of industrialists. This partia…

Between school and working life: Vocational teachers’ agency in boundary-crossing settings

2009

Abstract This paper investigates agency among vocational teachers with reference to boundary-crossing between school and working life. Our study utilised interviews with sixteen Finnish vocational teachers. Adopting a narrative analysis approach, we found that the teachers had a variety of forms of exercising agency in terms of decisions deliberately taken, and the discourse and actions following these decisions. These forms were: (i) restricted agency, (ii) extensive agency, (iii) multifaceted balancing agency, (iv) situationally diverse agency, and (v) relationally emergent agency. The exercising of agency was intertwined with the main resources and constraints emerging from the teachers’…

Modèles quantiques à deux états avec croisements de niveaux décrits par les fonctions de Heun

2019

The thesis is devoted to the fundamental problem of excitation and manipulation of quantum systems, having discrete energy spectrum, via external laser fields. We examine the semiclassical time- dependent quantum two-state problem, when the external electromagnetic field is resonant or quasi-resonant for some two of many levels of the system. The focus of the thesis is on the analytic description of the non- adiabatic evolution of quantum systems subject to excitation by level-crossing field configurations. In the present thesis we classify the complete set of the semiclassical time-dependent quantum two-state models solvable in terms of the five function of the Heun class.Main results of t…