1,721,051 research outputs found
Modena: un “dissesto” di lungo periodo. Nuovi dati sull’alluvionamento solido della città. Modena: a long duration “disarrangement”. New data concerning the natural sedimentation onto the city.
No full textVengono presentati nuovi dati stratigrafici e cronologici relativi alle dinamiche di alluvionamento solido del territorio negli ultimi 2500 anni rilevati nell’ambito urbano e suburbano della città di Modena nel corso di interventi di archeologia preventiva operati negli ultimi anni dalla Soprintendenza per i Beni Archeologici dell’Emilia-Romagna. Si sottolinea la distinzione tra episodio alluvionale ordinariamente inteso e relativa registrazione sedimentaria, ricordando il differente valore delle subfacies che caratterizzano l’ambiente alluvionale. Si evidenzia la differenza esistente nelle registrazioni sedimentarie tra gli ambiti suburbani orientale ed occidentale della città antica.
Si sottolinea come il tasso di sedimentazione naturale valutato anche sul medio periodo (decine di migliaia di anni) risulti doppio rispetto al tasso di subsidenza naturale.
Si caldeggiano future osservazioni sedimentologiche di estremo dettaglio per l’individuazione di eventuali fenomenologie naturali di tipo particolare riferibili non soltanto alle dinamiche fluviali.
New stratigraphic and radiochronometric data concerning the solid flooding of the ancient city of Modena and its surroundings during the last 2500 years are illustrated and discussed. These data were recorded during preventive archaeological essays performed by Soprintendenza per i Beni Archeologici dell’Emilia-Romagna during the last years. The difference between alluvial episode and its related sedimentary record as well as the interpretative value of the different alluvial environment subfacies are highlighted . The differences existing in the sedimentary record characterizing western and eastern surroundings of the ancient city are illustrated. The natural sedimentation rate evaluated through more thousand years appears to be double with respect to the natural subsidence rate. New detailed geoarchaeological surveys will have to inspect and recognize if other kinds of natural phenomena than the fluvial one happened and were stratigraphically recorded in Modena territory
Limidi. Fondo Magnavacca e Ca' Bisi
No full textLa realizzazione di prospezioni sul terreno, anche con l'uso di carotaggi, ha consentito di verificare l'estensione e la consistenza di una terramara "sepolta". I materiali disponibili datano il contesto al Bronzo recente
Carpi, Savana.
No full textIl contributo illustra i dati noti relativi ad una delle terramare più note e meglio conservate. Le informazioni derivate da prospezioni sistematiche sul terreno hanno consentito di verificare e precisare i dati relative alle strutture perimetrali (argine e fossato) e alla cronologia che vede una massiccia occupazione del sito durante la fase avanzata del Bronzo medio e nel Bronzo recente
A Comparison of Fractal Dimension and Spectrum Coefficient Characterization of 1/fα Noise
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Regularization with Optimal Space-Time Priors
No full textWe propose a variational regularization approach based on a multiscale representation called cylindrical shearlets aimed at dynamic imaging problems, especially dynamic tomography. The intuitive idea of our approach is to integrate a sequence of separable static problems in the mismatch term of the cost function, while the regularization term handles the nonstationary target as a spatio-temporal object. This approach is motivated by the fact that cylindrical shearlets provide (nearly) optimally sparse approximations on an idealized class of functions modeling spatio-temportal data and the numerical observation that they provide highly sparse approximations even for more general spatio-temporal image sequences found in dynamic tomography applications. To formulate our regularization model, we introduce cylindrical shearlet smoothness spaces, which are instrumental for defining suitable embeddings in functional spaces. We prove that the proposed regularization strategy is well-defined, and the minimization problem has a unique solution (for p > 1). Furthermore, we provide convergence rates (in terms of the symmetric Bregman distance) under deterministic and random noise conditions, within the context of statistical inverse learning. We numerically validate our theoretical results using both simulated and measured dynamic tomography data, showing that our approach leads to an efficient and robust reconstruction strategy
Meteosat Third Generation Phase A Lightning Imager: Concept definition, Trade-off and Preliminary Design report
No full text- …
