IRIS Università degli Studi dell'Aquila
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Camminare nella storia. Eventi, norme e processi trasformativi lungo le antiche vie della transumanza
No full textIl tema dei tratturi oggi in Abruzzo è spesso associato a progetti di mobilità lenta, di turismo sostenibile e di
valorizzazione (turistica ed economica) dei territori attraversati. Altrettanto spesso però, ci si trova a confrontarsi con
intrecci normativi complessi per via della duplice anima dei sedimi tratturali (beni demaniali con valenza monumentale
oltre che paesaggistica) e con l’assenza dei relativi strumenti di governo e tutela. Il Piano Quadro Tratturo (PQT), reso
obbligatorio dal DM del 1980 per tutti i comuni attraversati, per molti di questi non è stato ancora redatto. Per inciso,
tale decreto indicava la data del 22/12/1983 quale data di riferimento per la ricostruzione dell’occupazione del sedime
tratturale vincolando al contempo l’inedificabilità dei suoli. I processi trasformativi però, hanno poco o nulla risentito
di tali dispositivi in quanto quello che oggi si rinviene lungo i tratturi è spesso una forte commistione di usi agricoli
non consentiti e presenza di strutture sorte dopo la data indicata dal già citato DM. In particolare, nell’aquilano dove
a seguito del sisma del 2009, tali processi hanno subito una accelerazione che ha interessato l’occupazione con strutture
“provvisorie” anche i suoli dei tratturi. Partendo dalle analisi condotte per il redigendo PQT del comune de L’Aquila,
il lavoro ha come obiettivo quello di illustrare come le moderne tecniche di analisi con il supporto delle nuove
tecnologie possono contribuire a elaborare strategie efficaci per la formulazione di quadri conoscitivi aggiornati, e
dimostrare che i progetti di valorizzazione di questa rete non possono oggi prescindere dalla redazione dei
fondamentali PQT
Public reconstruction after L’Aquila 2009 earthquake: the case study of the ex-nursery school in “Viale Duca degli Abruzzi”
No full textFollowing L’Aquila 2009 earthquake, the complex process of recon-struction of public heritage, which is still ongoing, began. The renovation works with seismic improvement of the ex-nursery school in “Viale Duca degli Abruzzi”, recently completed, concerned a building built between the 30s and 40s of the twen-tieth century, originally designed for the social purposes of the National Organi-zation for the Protection of Maternity and Childhood (O.N.M.I.) as “Mother and Child’s House”.
The construction is a typical expression of rationalist architecture: following the violent earthquake of 2009, it didn’t have significant damage, that is a sign of the building’s good behavior towards both static and seismic loads. In fact, the improvement of the structural behavior versus seismic actions was achieved with minimally invasive interventions.
From a functional point of view, the project confirmed the building’s voca-tion to host a collective service, like a senior center and youth space. The project respects the conservation cultural heritage criteria, but, at the same time, satisfies the contemporary needs for reuse adding new volumes in steel. The material con-trast between old and new underlines the recognisability of the additions, without competing with the architectural elements of the rationalist tradition, appropriately preserved
Artificial intelligence in clinical medicine: a state-of-the-art overview of systematic reviews with methodological recommendations for improved reporting
Get PDFRegionalisation, Bias Correction and Downscaling of ERA5-Land Snow Variables by Means of Local Observations Recorded in Central Italy
Get PDFThe snow depth and the increase of snow depth after three consecutive days of snowfall, hereinafter referred to as ds and DH3gg, respectively, are typically chosen for avalanche protection and avalanche hazard assessment purposes. With specific reference to the Central Apennines (Central Italy), the preferable provider of observations for avalanche related applications is MeteoMont, which supplies ds observations at 34 manual stations, measured between 1978 and 2023. The area of interest is also covered by ERA5-Land, over a period of 73 years, from 1950 to 2023. In terms of temporal, spatial and quantitative availability of snow information, ERA5-Land consists in a more appealing choice as most manual weather stations set up in the Central Apennines are located at lower altitudes compared to where avalanches are likely to occur. Moreover, data recorded at manual stations appears to be incomplete, especially during extreme snowfall events. However, it is necessary to stress that ERA5-Land is affected by biases (e.g. underestimation or overestimation of extremes) and the use of uncorrected data in all applications might lead to unreasonable results. Therefore, in order to overcome the listed limitations, the suggested approach consists in the regionalisation of both ERA5-Land and MeteoMont ds and DH3gg and in the subsequent bias correction and downscaling of the regionalised ERA5-Land variables by means of the regionalised MeteoMont ones. With regards to ERA5-Land, 51 nodes have been considered as their grids intersect recorded and reconstructed avalanche paths in the Abruzzo Region (extracted from the Avalanche Record and the Map of Probabilistic Location of Avalanches provided by the Abruzzo Region). This ensures that the selected nodes are solely representative of areas where avalanches are most likely to occur. The regionalisation of both ERA5-Land and MeteoMont ds and DH3gg is performed by applying the index value regional method before the bias correction and the downscaling of ERA5-Land data as, in terms of computational efforts, only 2 bias corrections and downscalings for each couple of best-matched ERA5-Land and MeteoMont homogeneous areas would be required instead of 102 (2 for each couple of nodes and stations). The bias correction and downscaling of the ERA5-Land regionalised variables are then performed by means of a statistical transformation based on the assumption that said variables are described by one of the distributions belonging to the GEV family. This work is of particular relevance as, on the one hand, it overcomes the limited availability of snow information in the Central Apennines, especially in relation to avalanche related applications. In fact, it provides a tool that quantifies ds and DH3gg quantiles at elevations and sites that are not supplied with observations. On the other hand, it provides realistic initial and boundary conditions for simulating avalanche dynamics, drawing up hazard and risk maps, and designing active and/or passive defence structures
Asymptotic synchronization of Kuramoto oscillators with time delay and non-universal interaction
No full textWe study the emergence of synchronization in the Kuramoto model on a digraph in the presence of time delays. Assuming the digraph is strongly connected, we first establish a uniform bound on the phase diameter and subsequently prove the asymptotic frequency synchronization of the oscillators under suitable assumptions on the initial configurations. In the case of an all-to-all connection, we obtain an exponential synchronization estimate. Additionally, we present numerical simulations, providing further insights into the synchronization and oscillatory behaviors of the oscillator frequencies depending on the network structure and the magnitude of the time delay
Dynamical cosmological constant
Get PDFThe dynamical realization of the equation of state p & thorn; rho = 0 is studied. A nonpathological dynamics for the perturbations of such a system mimicking a dynamical cosmological constant (DCC) requires to go beyond the perfect fluid paradigm. It is shown that an anisotropic stress must be always present. The Hamiltonian of the system in isolation resembles the one of a Pais-Uhlenbeck oscillator and linear stability requires that it cannot be positive definite. The dynamics of linear cosmological perturbations in a DCC dominated Universe is studied in detail showing that when DCC is minimally coupled to gravity no dramatic instability is present. In contrast to what happens in a cosmological constant dominated Universe, the nonrelativistic matter contrast is no longer constant and exhibits an oscillator behavior at small scales while it grows weakly at large scales. In the gravitational waves sector, at small scales, the amplitude is still suppressed as the inverse power of the scale factor while it grows logarithmically at large scales. Also the vector modes propagate, though no growing mode is found
