0000000000364143
AUTHOR
G. Agrò
Il fenomeno della commoditization nel mercato delle conserve ittiche a base di tonno
Nel complesso scenario competitivo dell’odierno mercato globalizzato nasce la minaccia della commoditization: un processo in cui un prodotto (o un servizio) perde la differenziazione significativa rispetto ai concorrenti. Il prezzo risulta così l’unico parametro di scelta per il consumatore e il prodotto si trasforma in una commodity, diviene cioè “banale”. In una prospettiva empirica, si vuole qui studiare la commoditization nell’industria ittico conserviera del tonno descrivendone le dinamiche e le caratteristiche strutturali che presentano chiari segnali della “banalizzazione”. In particolare, attraverso lo strumento della mappa prezzo-benefici saranno indagati il maturo mercato del tonn…
Maximum likelihood estimation for the exponential power function parameters
This paper addresses the problem of obtaining maximum likelihood estimates for the three parameters of the exponential power function; the information matrix is derived and the covariance matrix is here presented; the regularity conditions which ensure asymptotic normality and efficiency are examined. A numerical investigation is performed for exploring the bias and variance of the maximum likelihood estimates and their dependence on sample size and shape parameter.
Semi-Continuous Lab-scale Plant for Hydrothermal or Organosolv Treatment of Lignocellulosic Biomass
Lignocellulosic biomass is increasingly being considered as a potential alternative source for both fuels and goods production. In order to better address the starting material to higher conversion and selectivity in the desired products, the possibility to selectively control the dissolution of the three main constituents of the matrix (hemicellulose, cellulose and lignin) should be pursued. As the three biopolymers are intimately connected one another, a suitable pretreatment step could help the effectiveness of the whole process, by producing cleavage of the biomacromolecules interconnecting bonds and by starting their depolymerization . In this frame, we developed a semi-continuous lab-…
Autism spectrum disorder in Italy: demand for an integrated epidemiological surveillance system.
Autism spectrum disorder (ASD) is a complex neurodevelopmental syndrome of emerging public health concern, according to a documented significant increase of diagnosed cases of ASD in Europe and USA. In Italy, actually, it is not possible to estimate at national level a reliable ASD occurrence by using existing health and scholastic data flows. The lack of information has implications on social and healthcare services dedicated to subjects affected by ADS. The database of the Italian institute in charge of social and security assistance was accessed at the provincial level to investigate the ASD cases occurred in the Palermo province. The official reports of all subjects visited in 2013 by I…