170,909 research outputs found
Esitti tragici nella scrittura di Tristano Caracciolo
No full textSi parla della Vita di Sergianni Caracciolo di Tristano Caracciolo
Tra Petrarca e Pontano: l'umanesimo di Tristano Caracciolo
No full textUn profilo di Tristano Caracciolo
Catalogo dei manoscritti medievali e umanistici del Fondo E. A. Cicogna conservato presso La Biblioteca Civica del Museo Correr di Venezia
No full textIntroduzione di Angela CARACCIOLO Arico
The AGROVOC Linked Dataset
No full textBorn in the early eighties as a multilingual authority file of agricultural index terms, AGROVOC has steadily evolved these last thirty years, moving to an electronic version around the year 2000 and shortly thereafter embracing the Semantic Web. Today AGROVOC is a SKOS-XL concept scheme published as Linked Open Data cloud, containing links (as well as backlinks) and references to many other Linked Datasets in the LOD cloud. In this paper we provide a brief historical summary of AGROVOC and detail its specification as a Linked Dataset
Thesaurus Maintenance, Alignment and Publication as Linked Data: The AGROVOC Use Case
No full textThe AGROVOC multilingual thesaurus maintained by the Food and Agriculture Organization of the United Nations (FAO) is now published as linked data. In order to reach this goal AGROVOC was expressed in Simple Knowledge Organization System (SKOS), and its concepts provided with dereferenceable URIs. AGROVOC is now aligned with ten other multilingual knowledge organization systems related to agriculture, using the SKOS properties exact match and close match. Alignments were automatically produced in Eclipse using a custom-designed tool and then validated by a domain expert. The resulting data is publicly available to both humans and machines using a SPARQL endpoint together with a modified version of Pubby, a lightweight front-end tool for publishing linked data. This paper describes the process that led to the current linked data AGROVOC and discusses current and future applications and directions
Elliptic tori in FPU non-linear chains with a small number of nodes
No full textWe revisit an algorithm constructing elliptic tori, that was originally designed for applications to planetary hamiltonian systems. The scheme is adapted to properly work with models of chains of N + 1 particles interacting via anharmonic potentials, thus covering also the case of FPU chains. After having preliminarily settled the Hamiltonian in a suitable way, we perform a sequence of canonical transformations removing the undesired perturbative terms by an iterative procedure. This is done by using the Lie series approach, that is explicitly implemented in a programming code with the help of a software package, which is especially designed for computer algebra manipulations. In the cases of FPU chains with N = 4 , 8 , we successfully apply our new algorithm to the construction of elliptic tori for wide sets of the parameter ruling the size of the perturbation, i.e., the total energy of the system. Moreover, we explore the stability regions surrounding 1D elliptic tori. We compare our semi-analytical results with those provided by numerical explorations of the FPU-model dynamics, where the latter ones are obtained by using techniques based on the so called frequency analysis. We find that our procedure works up to values of the total energy that are of the same order of magnitude with respect to the maximal ones, for which elliptic tori are detected by numerical methods. ? 2021 Elsevier B.V. All rights reserved
Computer-assisted estimates for birkhoff normal forms
No full textBirkhoff normal forms are commonly used in order to ensure the
so called “effective stability” in the neighborhood of elliptic equilibrium points
for Hamiltonian systems. From a theoretical point of view, this means that
the eventual diffusion can be bounded for time intervals that are exponen-
tially large with respect to the inverse of the distance of the initial conditions
from such equilibrium points. Here, we focus on an approach that is suitable
for practical applications: we extend a rather classical scheme of estimates
for both the Birkhoff normal forms to any finite order and their remainders.
This is made for providing explicit lower bounds of the stability time (that
are valid for initial conditions in a fixed open ball), by using a fully rigorous
computer-assisted procedure. We apply our approach in two simple contexts
that are widely studied in Celestial Mechanics: the Hénon-Heiles model and
the Circular Planar Restricted Three-Body Problem. In the latter case, we
adapt our scheme of estimates for covering also the case of resonant Birkhoff
normal forms and, in some concrete models about the motion of the Trojan
asteroids, we show that it can be more advantageous with respect to the usual
non-resonant ones
Architetti in Sicilia. Edoardo Caracciolo e Gianni Pirrone
No full textIl saggio riguarda due importanti figure della Scuola di Architettura di Palermo: Eduardo Caracciolo e Gianni Pirrone, il maestro e l'allievo. Figure dimenticate di cui il saggio delinea gli aspetti disciplinari dei professori e i contenuti comuni, riconducibili agli aspetti culturali del tempo
Organic farming increases the technical efficiency of olive farms in Italy
No full textWhile there is growing recognition of the positive role played by organic farming in the reduction of the negative externalities due to conventional agriculture, there is uncertainty about the effect of the latter on the economic performance of the farms. In this scenario, the present paper aims at investigating the effect of organic farming on technical efficiency in Italian olive farms. A cross‐section dataset was analyzed through the stochastic frontier function, where the adoption of organic farming was explicitly modeled. Then, to obtain an unbiased estimate of the impact of organic farming on technical efficiency, a propensity score matching method was implemented. The findings reveal that organic farming increases technical efficiency in Italian olive farms by approxi-mately 10%. The highest impact of organic farming is observed in small farms. As for the propensity to become organic, we found that the production and the direct sales of a higher quality of gross marketable output, as well as the intensity of labor and machines, increase the probability to adopt organic farming. Conversely, farm localization, the availability of family labor, and financial capital discourage conversion to the organic farming system
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