3,520 research outputs found
Considerazioni conclusive
No full textElementi conclusivi e riflessioni sulla condizione giovanile nelle aree interne considerando obiettivi e traiettorie di vita che perdono qualsiasi tratto di certezza – più che mai considerando la condizione pandemica in atto al momento della rilevazione – e la diffusione dell’intenzione volontaria di restanza che raggiunge la metà del campione delle aree interne
A Model of Electric Vehicle Recharge Stations based on Cyclic Markov Chains
No full textThe electricity market is constantly growing and is facing unprecedented planning needs. Loads are no longer as systematic as in the past due to changing user habits and the likewise for the generation of energy due to the unpredictability of renewable sources. Demand response (DR) strategies are the basis of resource planning, but these methods cannot ignore the presence of accurate load models that can predict behavior. In this panorama, the prediction of the loads due to the recharging of electric vehicles, offers interesting ideas of complexity, which make it a topic of open research. In this paper we will show a method of reconstruction of charging profiles through Markov Chains, starting from distributions derived from experimental data
Modeling multiradicals in crosslinking MMA/EGDMA bulk copolymerization
No full textIn the present work, a kinetic model of crosslinking free-radical copolymerization based on multidimensional population balances and accounting for multiradicals is developed. The model is applied to the simulation of bulk copolymerization of methyl-methacrylate (MMA)/ethylene-glycol-dimethacrylate (EGDMA). A literature criterion proposed to elucidate the model type best suited for a given system (i.e., with or without MRs) is extended to the industrially relevant case of diffusion limited systems. Moreover, a master plot for the system under investigation is proposed: given the reaction recipe, the error on the gel point prediction employing the monoradical assumption is identified, thus allowing more conscious model selection. The relevance of active chains bearing multiple active sites (multiradicals) in the MMA/EGDMA system can be appreciated estimating the relative error on the gel point prediction vs. crosslinker content, when comparing the predictions of two models, one accounting and the other neglecting such species. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
A semi-parametric dynamic conditional correlation framework for risk forecasting
No full textWe develop a novel multivariate semi-parametric framework for joint portfolio Value-at-Risk (VaR) and Expected Shortfall (ES) forecasting. Unlike existing univariate semi-parametric approaches, the proposed framework explicitly models the dependence structure among portfolio asset returns through a dynamic conditional correlation (DCC) parameterization. To estimate the model, a two-step procedure based on the minimization of a strictly consistent VaR and ES joint loss function is employed. This procedure allows to simultaneously estimate the DCC parameters and the portfolio risk factors. The performance of the proposed model in risk forecasting on various probability levels is evaluated by means of a forecasting study on the components of the Dow Jones index for an out-of-sample period from December 2016 to September 2021. The empirical results support effectiveness of the proposed framework compared to a variety of existing approaches
Early Italian Scholars of Ius Gentium
No full textLa ricerca verte su temi e questioni di diritto internazionale affrontati dai giuristi italiani tra medioevo e età moderna, a partire dalla tradizione altomedievale, fino alla fondazione del ius gentium come disciplina autonoma da parte di Alberico Gentili. I temi della guerra, della pace e dei trattati internazionali sono analizzati attraverso i frammenti dell'interpretazione del diritto romano, i consilia e i trattati.Between the twelfth and fifteenth centuries several issues led jurists to rethink the international legal order established in the Roman Empire and the Early Middle Ages. The first was the need to update the list of the law of nations legitimate subjects after the birth of the commune that had not been accounted for in Roman-law sources. The second was to recreate a superior and universally shared set of ‘public’ law rules for international relations to counteract the tendency of communal and monarchical governments to consider the law inter gentes as a form of internal law. In order to address this issue Bartolus of Sassoferrato adapted the Roman category of ius gentium to the features of the medieval geopolitical context. Other topics focused on defining the enemy, freedom of peoples, and treaties among unequal subjects, while the theory of ius gentium of Alberico Gentili was fully rooted in the medieval and early modern legal tradition
Self-Diffusion of Small Molecules into Rubbery Polymers: A Lattice Free-Volume Theory
No full textIn the framework of the Free Volume Theory, a new equation was derived for the evaluation of self-diffusion coefficients of small molecules in polymers above the mixture glass transition temperature. The derivation of the equation turned out to be straightforward once the equivalence between the free-volume and the unoccupied volume given by Thermodynamic Lattice Theories is assumed. A parameter evaluation scheme is proposed, which is substantially simpler compared to the conventional Vrentas-Duda approach, even without losing generality. The key assumption is discussed and its consistency is verified from a numerical viewpoint. A comparison with experimental solvent self-diffusion coefficients for several solvent/polymer binary systems confirmed that the proposed theory presents good correlative ability over wide temperature and composition ranges. Moreover, the introduced thermodynamic foundation allows one to easily include the pressure effect too. In the frame of the proposed Lattice-Free Volume theory, the sizes of the polymer jumping units decrease with temperature and increase with pressure. Such behavior converges with theoretical expectations and opens the way for a predictive Free Volume Theory
Il segreto di Stato tra "flessibilità" e "invecchiamento" della Costituzione negli anni '60 e '70 del secolo scorso
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