2,144 research outputs found
Boschi e foreste e ruolo della Corte costituzionale
No full textIl lavoro analizza il contributo della Corte costituzionale nella difficile identificazione giuridica di concetti come "boschi e foreste" e, soprattutto, si concentra sulla difficile trasposizione della "multifunzionalità", insita nei boschi e nelle foreste, in una Costituzione quale quella italiana che, dopo la modifica del Titolo V, fa della settorializzazione la caratteristica principale dell'art. 117 Cost
Stationary-phase integrals in the cross correlation of ambient noise
No full textThe cross correlation of ambient signal allows seismologists to collect data even in the absence of seismic events. “Seismic interferometry” shows that the cross correlation of simultaneous recordings of a random wavefield made at two locations is formally related to the impulse response between those locations. This idea has found many applications in seismology, as a growing number of dense seismic networks become available: cross-correlating long seismic records, the Green's function between instrument pairs is “reconstructed” and used, just like the seismic recording of an explosion, in tomography, monitoring, etc. These applications have been accompanied by theoretical investigations of the relationship between noise cross correlation and the Green's function; numerous formulations of “ambient noise” theory have emerged, each based on different hypotheses and/or analytical approaches. The purpose of this study is to present most of those approaches together, providing a comprehensive overview of the theory. Understanding the specific hypotheses behind each Green's function recipe is critical to its correct application. Hoping to guide nonspecialists who approach ambient noise theory for the first time, we treat the simplest formulation (the stationary-phase approximation applied to smooth unbounded media) in detail. We then move on to more general treatments, illustrating that the “stationary-phase” and “reciprocity theorem” approaches lead to the same formulae when applied to the same scenario. We show that a formal cross correlation/Green's function relationship can be found in complex, bounded media and for nonuniform source distributions. We finally provide the bases for understanding how the Green's function is reconstructed in the presence of scattering obstacles.Geoscience & EngineeringCivil Engineering and Geoscience
Il narrator cortese
No full textrecensione del volume di V. Savi, Adolfo Natalini-Natalini Architetti, nuove architetture raccontate, Milano 1996
Which REE prediction equation should we use in normal-weight,overweight and obese women?
No full textBistability of the climate around the habitable zone: A thermodynamic investigation
No full textThe goal of this paper is to explore the potential multistability of the climate for a planet around the habitable zone. We apply our methodology to the Earth system, but our investigation has more general relevance. A thorough investigation of the thermodynamics of the climate system is performed for very diverse conditions of energy input and infrared atmosphere opacity. Using PlaSim, an Earth-like general circulation model, the solar constant S* is modulated between 1160 and 1510Wm-2 and the CO2 concentration, [CO2], between 90 and 2880ppm. It is observed that in such a parameter range the climate is bistable, i.e. there are two coexisting attractors, one characterised by warm, moist climates (W) and one by completely frozen sea surface (Snowball Earth, SB). The tipping points of both the transitions (W→SB and SB →W) are located along straight lines in the (S*,log[CO2]) space. The dynamical and thermodynamical properties - energy fluxes, Lorenz energy cycle, Carnot efficiency, material entropy production - of the W and SB states are very different: W states are dominated by the hydrological cycle and latent heat is prominent in the material entropy production; the SB states are eminently dry climates where heat transport is realised through sensible heat fluxes and entropy mostly generated by dissipation of kinetic energy. We also show that the Carnot efficiency regularly increases towards each transition between W and SB, with a large discontinuous decrease at the point of each transition. Finally, we propose well-defined empirical functions allowing for expressing the global non-equilibrium thermodynamical properties of the system in terms of either the mean surface temperature or the mean planetary emission temperature. While the specific results presented in this paper depend on some characteristics of the Earth system (e.g. rotation rate, position of the continents), this paves the way for the possibility of proposing efficient parameterisations of complex non-equilibrium properties and of practically deducing fundamental properties of a planetary system from a relatively simple observable. As a preliminary result, we obtain that when reducing the rotation rate of the planet by a factor of two, the multistability properties, the quantitative estimators of the thermodynamics of the system, and the approximate parameterisations in terms of the surface of emission temperature are only weakly affected. © 2013
Which REE prediction equation should we use in normal-weight,overweight and obese women?
No full textWhich REE prediction equation should we use in normal-weight,overweight and obese women?
No full textin: Beatini V., Libri - La tridimensionalità della facciata come tema progettuale
No full textrecensione del volume Fenomenologia della facciat
Un approccio integrato per lo studio del paesaggio antico: il caso di Classe
No full textLa città di Classe nasce agli inizi del V secolo a sud di Ravenna con la principale funzione di città portuale. Da 10 anni il sito è oggetto delle nuove ricerche condotte dal Dipartimento di Archeologia dell’Università di Bologna, in collaborazione con la Soprintendenza per i Beni Archeologici dell’Emilia Romagna e la Fondazione RavennAntica. In questi anni, oltre a nuovi importanti scavi archeologici, è stato avviato un progetto di studio del territorio attraverso un approccio integrato di differenti tecniche di indagine e metodologie informatiche, che ricorre anche al remote sensing, alla fotografia aerea e alla geofisica per la ricostruzione della città e del paesaggio antichi. L’integrazione di tutte le fonti di informazioni disponibili si sta rivelando la strategia vincente per affrontare un contesto difficile come quello di Classe, dove la presenza di terreni argillosi e umidi rende complicata la formazione di cropmarks, come l’applicazione di tutti i sistemi geofisici. Per questo una parte rilevante della ricerca consiste nell’interpretazione ragionata dei dati sulla base dell’integrazione delle informazioni ricavabili dal telerilevamento, dalla geofisica, dalle fonti cartografiche e archeologiche.
Fino a questo momento, questa strategia ha permesso di chiarire la topografia e il tessuto urbano antichi, con la scoperta della basilica Petriana, uno degli edifici religiosi più importanti di V secolo, l’individuazione della principale viabilità e di altre infrastrutture. I risultati ottenuti con le nuove indagini hanno spesso stimolato l’apertura di nuovi scavi che hanno permesso di verificare i dati della diagnostica
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