Search results for "RCA"

4. Il vivaismo ornamentale

2007

Il comparto vivaistico in Italia riveste un ruolo fondamentale per le diverse filiere dell’agroalimentare, collocandosi a monte del sistema produttivo, ne rappresenta un momento strategico; la qualità e le caratteristiche delle produzioni finali dipendono, in larga misura, da quelle possedute dal materiale di base utilizzato per la propagazione. In Sicilia, come nel resto del paese, l’attività vivaistica cerca di rispondere alle esigenze ed alle peculiarità della produzione agricola regionale, fondata principalmente sui comparti agrumicolo, olivicolo, ortofrutticolo e vitivinicolo. In tale quadro si colloca, ed assume particolare importanza il vivaismo ornamentale che presenta una vasta gam…

Intentos en la articulación del mercado comarcal: el camino vecinal de Alberic a Alzira, 1853 - 1858

1983

Pasajes de París / 2; Walter Benjamin

2006

Weakly nonlinear analysis of Turing patterns in a morphochemical model for metal growth

2015

We focus on the morphochemical reaction–diffusion model introduced in Bozzini et al. (2013) and carry out a nonlinear bifurcation analysis with the aim to characterize the shape and the amplitude of the patterns arising as the result of Turing instability of the physically relevant equilibrium. We perform a weakly nonlinear multiple scales analysis, and derive the normal form equations governing the amplitude of the patterns. These amplitude equations allow us to construct relevant solutions of the model equations and reveal the presence of multiple branches of stable solutions arising as the result of subcritical bifurcations. Hysteretic type phenomena are highlighted also through numerica…

Effect of different dispersing additives on the morphology and the properties of polyethylene-based nanocomposite films

2011

In this work, the use of a polar wax, e.g. amphiphilic Tegomer ® E 525 (TEG) is investigated with the aim of mod- ifying, and possibly improving, the dispersion of an organically modified nanoclay (OMMT), loaded at 5 wt%, in a poly- ethylene matrix (PE) at relatively low loading levels. We have indeed found that the incorporation of low loadings, e.g. 0.5 wt%, of TEG, an amphiphilic block co-polymer, into a PE/OMMT sample results in a substantial improvement of the clay dispersion in the nanocomposite and, consequently, of the mechanical and thermomechanical properties of the films. The achieved results are comparable to those obtained for systems containing traditional dispersing agents su…

Stochastic modeling and prediction of catalytic converters degradation

2009

This paper proposes a stochastic model for describing the degradation process of catalytic converters over time, where the degradation is indirectly measured through the emission of complex hydrocarbons (HC) in legislated driving cycles. The proposed model is the superposition of two processes, the former being a dependent increments process which describes the actual degradation process, and the latter a white noise process which models the experimental errors. In particular, the proposed model assumes that the degradation growth in a small usage interval depends on the degradation level at the beginning of the interval, rather than on the age of the converter. The model has been applied t…

Immigrant Labour and viticulture activity: the Case of the Ribera del Duero

2017

Spain is one of the main countries with significant presence in the global wine market. Ribera de Duero is a region which currently has a very important presence both nationally and internationally in the global production of wine. Studies conducted in the area have addressed different angles of those changes. One of the aspects more addressed in existing studies is the wine tourism strategy, the elements that have enabled the growth of this strategy and the impacts on the region. However, one of the aspects that has not been very much discussed is the importance of the labor force involved in this activity. On this communication, we will focus on analyzing the importance of the migrant la…

A regenerative braking system for internal combustion engine vehicles using supercapacitors as energy storage elements - Part 2: Simulation results

2020

Abstract In this two-part work, an electric kinetic energy recovery system (e-KERS) for internal combustion engine vehicle (ICEV) is presented and its performance evaluated through numerical simulations. The KERS proposed is based on the use of a supercapacitor as energy storage, interfaced to a brushless machine through a properly designed power converter. In Part 1, the system is described and analysed, and the mathematical model used for the simulations is presented. For each component of the KERS, the real efficiency and the power or energy limitations are adequately considered. In Part 2, the energetic and economic advantages attainable by the proposed KERS are evaluated using MATLAB S…

A regenerative braking system for internal combustion engine vehicles using supercapacitors as energy storage elements - Part 1: System analysis and …

2020

Abstract In this two-part work, an electric kinetic energy recovery system (e-KERS) for internal combustion engine vehicle (ICEV) is presented, and its performance evaluated through numerical simulations. The KERS proposed is based on the use of a supercapacitor as energy storage, interfaced to a brushless machine through a properly designed power converter. In part 1, the system is described and analysed, and the mathematical model used for the simulations is presented. For each component of the KERS, the real efficiency, and the power or energy limitations are adequately considered. In part 2, the energetic and economic advantages attainable by the proposed KERS are evaluated using MATLAB…

Lo ZEN e l'arte della narrazione dei luoghi

2011

This paper aims at analysing a very well-known Italian neighbourhood, which is located in Palermo and called Zen. This neighbourhood has often been described as a clear example of the worst and most disgraced urban landscapes in Italy, as mass media and local stakeholders shaped its image for their own uses. Through a series of interviews, on-the-spot inspections and the use of other qualitative methodologies, the final goal of this paper is to subvert traditional representations of this place and enforce a plural way of describing it, using research techniques that might position the researcher and his or her own description inside a larger framework. Would geographers, social scientists a…