1,721,134 research outputs found
Depositional architecture and sequence stratigraphy of pleistocene coarse-grained deltas along the Ligurian coast (Italy)
No full textThis study aims to develop a better understanding of the stratigraphy of the southern side of the Maritime Alps and of the Ligurian Sea during the Plio-Pleistocene. Five stratigraphic sections were measured and studied in the Segno River valley (Liguria, Italy). These sections are composed of Lower to Middle Pleistocene marine and continental deposits. Based on detailed mapping and sedimentological analysis, 12 marine and deltaic facies were identified. These facies were grouped into facies associations. Two allostratigraphic units were recognized, namely U1 and U2 from oldest to youngest. The lower unit (U1) represents the evolution of a coarse-grained delta developed in a valley or embayment. Within the deltaic sequence, transgressive and highstand systems tracts were recognized. The coarsening/shallowing upward trend observed within the sections suggests that the delta prograded rapidly in the landward portion of the canyon adjacent to the paleo-river outlet. The upper boundary of U1 is represented by a subaerial unconformity overlain by U2, which is composed of sediments deposited by several alluvial fan systems
John Tedeschi (1931-2023)
No full textRicordo di uno dei maggiori storici del dissenso religioso nell'Italia del Cinquecent
Chaos suppression in the large size limit for long-range systems
No full textWe consider the class of long-range Hamiltonian systems first introduced by Anteneodo and Tsallis and called the alpha -XY model. This involves N classical rotators on a d-dimensional periodic lattice interacting all to all with an attractive coupling whose strength decays as r(-alpha), r being the distance between sites. Using a recent geometrical approach, we estimate for any d-dimensional lattice the scaling of the largest Lyapunov exponent (LLE) with N, as a function of a in the large energy regime where rotators behave almost freely. We find that the LLE vanishes as N-kappa, with kappa = 1/3 for 0 less than or equal to alpha /d less than or equal to 1/2 and kappa = 2/3(1 - alpha /d) for 1/2 less than or equal to alpha /d < 1. These analytical results present a nice agreement with numerical results obtained by Campa et al, including deviations at small N
La duna perduta: indagini micromorfologiche su lembi relitti dell’antico deposito eolico delle Arene Candide (Finale Ligure, NW Italia)
No full text
Battista Franco «pittore viniziano» nella cultura artistica e nella vita religiosa del Cinquecento
No full textIn questo saggio su Battista Franco si mostra la complessità e perfino l’enigmaticità dei rapporti tra tecnica pittorica ed esperienza religiosa in quell’età cruciale della storia della coscienza italiana
'The stolen space': A history of channelization, reduction of riverine areas and related management issues. The lower Scrivia River case study (NW Italy)
No full textIn this research, we present the lower Scrivia River planform changes occurred from 1878 to 2016. furthermore, we illustrate the channelization-works development and the land-use changes registered close to the riverbed after the 1950s. The Scrivia River is among the most relevant right-bank tributaries of the Po River; it is about 90 km long and origins from the Ligurian-Piedmontese Appennines. The study reach is about 16 km long, close to the Po River, and generally shows a single-thread, sinuous and deep-incised channel. Nowadays the lower Scrivia River presents many bank retreat processes that involve surrounding areas, creating serious management issues. The aim of this research is to outline in detail the active-channel morphological evolution over the last 100-150 years, and characterize channelization and riverscape changes, with a specific focus on the occupation of the areas of fluvial pertinence. A quantitative multi-temporal analysis supported by field surveys and based on historical maps, aerial photographs and satellite images was performed in a GIS environment through automated and semi-automated procedures. The active channel experienced a well-defined sequence of morphological evolutionary phases. They were substantially characterized by a gradual increase of the active-channel stability and a reduction of the active-channel width, up to the end of the 20th century. Since the 2000s, morphological evolutionary trends have changed. Anthropic pressures on the river system, and in particular bank protections, are documented to have played a key role in driving the active-channel changes, and consequently, the near-riverbed land-property and land-use changes. In this respect, on the basis of cadastral data, the past legal framework is also identified as a relevant conditioning factor of the river-corridor morphological evolution. The ongoing dynamics most probably represent the morphological response to the documented, severe anthropic alterations, and are currently raising serious management issues
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