TERRITORIAL INTEGRATION AND MARINAS IN SARDINIA

Abstract Nautical tourism, considered one of the elect expressions of Italy's offer in the field of tourism, assumes new strategic importance in Sardinia's economic and social framework in the light of the fallout it generates in terms of development and the multifaceted composition of the demand which today characterizes the sector. Such considerations are confirmed by the incidence of the fleet of pleasure craft compared to the resident population, although paradoxically the important marinas are present in areas that are marginal in the panorama of the region's holiday industry. This fact emphasizes the lack of correspondence between an important number of infrastructures - Sardinia is the second Italian region for port infrastructures and berths – and effective territorial integration between nautical installations and inland holiday resort structures. This is to say that it is still quite difficult to interpret the territorial effects of marinas on accommodation facilities.

3-D geometrical modelling and solar radiation at urban scale - morphological or typological digital mock-ups?

Studies regarding solar energy at the neighbourhood scale always have to deal with the size and the complex geometry of a real built context. Three-dimensional modelling techniques allow visual reproduction of formal features and solar performance of a city portion. Nevertheless, the definition of the right level of detail (LOD) is always a crucial point when creating digital mock-ups. On the one hand, currently available computational resources are not totally able to suport the exact representation of a building cluster and the simulation of environmental phenomena is often based on parametrical analyses. On the other hand, a drastic geometrical abstraction could discard important information and affect the reliability of solar predictions. This study aims to identify the most suitable LOD to simulate the solar performance at the mesoscale of the city. To do this, the direct radiation access within a building cluster is assessed by employing virtual models with different approximation degrees. This comparison allows assessing the margin of error between different levels of detail and discussing about benefits and inconveniences of the two approaches. The results might be elaborated to define a rank of deviation factors, useful to evaluate the margin of error provided by generic models with regard to solar predictions.Peer ReviewedPostprint (published version

Solar access in the compact city: a study case in Barcelona

Postprint (published version

L'erbario del Prof. Manlio Chiappini (1924-1998) in Herbarium CAG

The herbarium of Chiappini, held in Herbarium CAG of Cagliari University, is presented. Prof. Manlio Chiappini, who dead the 4th of january 1998, teached Botany at the Athenaeum of Cagliari from 1965 to 1987 and from 1965 to 1986 he was director of Botanical Institute and Botanical gardens of Cagliari University. From a research carried out in Herbarium CAG is shown that Chiappini’s herbarium is compound of 1262 exsiccata, referred to 630 specific and subspecific entities (about the 30% of Sardinian flora), of which 45 referred to endemic species (about the 20% of Sardinian flora) and that the Museum Herbarium CAG itself is depositary of a number of 4 species pointed out, by the Author himself, for the first time to Sardinia

On magnetic reconnection as promising driver for future plasma propulsion systems

This work presents a more detailed analysis of the process of magnetic reconnection as promising ion beam accelerator mechanism with possible applications in laboratory plasmas and, more importantly, in the plasma propulsion field. In a previous work, an introductory study on this subject was already carried out, yet under the adoption of relevant approximations, such as the limitation to 2.5D simulations and the especially use of Hydrogen plasma as a propellant, whose element is rarely considered in the real scenario. Also, the analysis mainly focussed on studying the physical content of the outcomes, by leaving out the analysis of more important engineering quantities, such as the mass flow and thrust effectively reached out of such systems. With this work, we intend to fill these gaps in order to provide further insights into the great potentiality of a future technology based on magnetic reconnection. Additionally, one of the possibly limiting features was the inevitable symmetric outflow produced by the reconnection process. Among all the possible solutions adoptable, we propose here a solution based on the particle behavior undertaken in entering the reconnection region according to the initial density profile. We demonstrate that a noticeable net thrust value can be achieved by setting up a longitudinal asymmetric density profile with a relevant drop gradient

Optical Modeling of Plasmonic Nanoparticles with Electronically Depleted Layers

Doped metal oxide (MO) nanocrystals (NCs) are well-known for the localized surface plasmon resonance in the infrared range generated by free electrons in the conduction band of the material . Owing to the intimate connection between plasmonic features and t h e NC's carrier density profile, proper modeling can unveil the underlying electronic structure. The carrier density profile in MO NCs is characterized by the presence of an electronically depleted layer as a result of the Fermi level pinning at the surface of the NC. Moreover, the carrier profile can be spatially engineered by tuning the dopant concentrations in core-shell architectures, generating a rich plethora of plasmonic features. In this work, we systematically studied the influence of the simulation parameters used for optical modeling of representative experimental absorption spectra by implementing multilayer models. We highlight in particular the importance of minimizing the fit parameters by support of experimental results and the importance of interparameter relationships. We show that, in all cases investigated, the depletion layer is fundamental to correctly describe the continuous spectra evolution. We foresee that this multilayer model can be used to design the optoelectronic properties of core-shell systems in the framework of energy band and depletion layer engineering

Belbello da Pavia, un protagonista del Tardogotico tra la Lombardia e Venezia

This study focuses on Giovanni Belbello da Pavia, a miniator that has been working from the beginning of the third to the end of the seventh decade of the 15th century. His activity took place during the crucial years for the most important courts of the northern Italy, including the Visconti, the Este and the Gonzaga, and it ended in Venice at the service of the Benedictine monastery of San Giorgio Maggiore. His artistic production marked the transition from the late Gothic period to the Renaissance. His youthful and training phase is currently being studied and clarified, but it remains problematic due to the total lack of attestations regarding those years. Reliable data on the miniator can be associated with an already mature period of his career and has been obtained from a collection of documents kept at the State Archives of Mantua, covering the period from 1442 to 1462. These documents exclusively testify of about his activity for the Gonzaga family, by which he was commissioned to decorate the missal known as the Missal of Barbara, today kept in the Archdiocese of Mantua. Much of this research was dedicated to the archive survey, by focusing the attention on the funds of the State Archives of Mantua and Milan, with the aim of retrieving documents regarding the miniator and his activity, especially during the years in which the information was completely missing. By conducting this study, it has been possible to discover some unpublished documents which demonstrate that the relationships between the commissioner and the artist were extremely tense. In the State Archives of Milan, it was found a letter sent by the ducal chancellor to the monks of the Certosa di Pavia, asking for asylum and assistance for Giovanni Belbello da Pavia, now old and reduced to poverty. This document, dated October 1473, is very important because it proves that the miniator was still alive on that date (while the most recent attestation known dates back to 1462) and allows to extend the chronological terms of his caree