87,488 research outputs found
Paravicini (Werner). Colleoni und Karl der Kühne. Mit Karl Bittmanns Vortrag «Karl der Kühne und Colleoni » aus dem Jahre 1957, (Studi. Schriftenreihe des Deutschen Studienzentrums in Venedig / Centro Tedesco di Studi Veneziani, n. F., 12) 2014
No full textCauchies Jean-Marie. Paravicini (Werner). Colleoni und Karl der Kühne. Mit Karl Bittmanns Vortrag «Karl der Kühne und Colleoni » aus dem Jahre 1957, (Studi. Schriftenreihe des Deutschen Studienzentrums in Venedig / Centro Tedesco di Studi Veneziani, n. F., 12) 2014. In: Revue belge de philologie et d'histoire, tome 94, fasc. 2, 2016. Histoire Médiévale, Moderne et Contemporaine – Middleleeuwse, Moderne en Hedendaagse Geschiedenis. pp. 514-515
Shallow upper mantle rheology and secular ice sheets fluctuations
No full textOn time scales from decades to centuries, continental cryospheric forcing in response to climate change constitutes a major source of isostatic disequilibrium that may influence future regional sea level variations. Current vertical displacements and gravity field variations are often estimated neglecting rheological effects and thus assuming a fully elastic response of the Earth. In this study, we adopt a more general point of view, aiming at describing ongoing surface movements resulting from recent glacial instabilities, also taking into account the effects associated with shallow upper mantle and crustal rheologies. Our computations are based on the Post–Widder Laplace inversion formula, which permits the straightforward computation of load-deformation coefficients for steady state and transient rheologies up to very high harmonic degrees. Using a surface load with a simple geometry and time history, we compare the classical elastic solutions to those obtained considering the rheological response of the shallow upper mantle. While at the center of the ice sheet rheology only magnifies the elastic response, the pattern and time history of vertical displacement at the ice sheet margins show a greater complexity, mainly due to the development of lateral forebulges whose shape and amplitude are particularly sensitive to the rheology of the shallow upper mantle. In this region, assuming an elastic rheology is generally appropriate on a century time scale, but significant deviations from a purely elastic response (both sign and amplitude) are observed at longer time scales or when a low viscosity zone with Maxwell rheology is taken into account
Glacio-isostatic adjustment in the Po plain and in the northern Adriatic region
No full textVertical movements in the Po plain (northern Italy) are controlled by natural and anthropogenic
effects. Since Italy is located in the far–field of the former late Pleistocene ice sheets, isostatic deformations are
primarily driven by melt water loading and represent a major component of long–term natural movements across
the entire Mediterranean. In addition to far–field sources, here we consider the isostatic effects of melting of the
nearby Wu ̈rm Alpine ice–sheet, suggesting that it is possible to put bounds on its maximum thickness, extent
and chronology by Holocene relative sea level observations from the northern Adriatic. Using various plausible
ice models, and adopting a viscosity profile that matches Holocene relative sea level observations in the
Mediterranean, we find that melting of the Alpine ice sheet is always responsible for upward movements in the
Po plain, currently at rates of * 0.5 mm/yr. When both far– and near–field sources are considered, the rate of
sea level change in the Venetian Lagoon for the most reasonable mantle rheology and melting chronology is
negative, i.e., opposite to that attributed to human activity and recent climatic variations. However, its amplitude
(fractions of mm/yr) is small compared to the secular signal observed by tide gauges (*2 mm/yr), which makes
glacial isostasy a second–order mechanism of sea level variation in this region
Post glacial readjustment, sea level variations, subsidence and erosion along the Italian coasts
No full textOngoing sea level variations and vertical land movements measured by tide gauges and continuous GPS stations along the Italian coasts stem from several factors acting on different spatiotemporal scales. Conversely to tectonics and anthropogenic effects, which are characterized by a heterogeneous signal, the adjustment of solid Earth and geoid to the melting of the late– Pleistocene ice sheets results in a smooth long–wavelength pattern of sea level variation and vertical deformation across the Mediterranean, mostly driven by the melt water load added to the basin. In this work we define upper and lower bounds of the effects of glacial isostatic adjustment (GIA) on current sea level variations and vertical ground movements along the coasts of Italy. For plausible mantle viscosity profiles we explore to what extent the spatial variability of observed rates may be attributed to delayed isostatic recovery of both solid Earth and geoid. In addition, we show that long–wavelength patterns of sea level change are tuned by the effects of GIA, and that coastal retreat in Italy is broadly correlated with the expected ongoing rates of post–glacial sea level variations
13 - Modeling the post-LGM deglaciation of the Scandinavian-Barents Sea Ice Sheet: a model intercomparison approachM. Petrini, N. Kirchner, F. Colleoni, A. Camerlenghi, M. Rebesco, R.G. Lucchi, R. Noormets, E. Forte, R.R. Colucci
No full textARCA Project - Final Conference, 11 October 2016 Rome - Poster Session - Marine Geology - Extended abstract(M. Petrini, N. Kirchner, F. Colleoni, A. Camerlenghi, M. Rebesco, R.G. Lucchi, R. Noormets, E. Forte, R.R. Colucci)</div
The Right to the City: Mobility of Proximity and Social Inclusion of Elderly People
No full textThat to the city is a fundamental right that emphasises the importance of people’s access to the opportunities of urban life, including essential services and cultural activities. This contribution argues that mobility of proximity and walkability are essential components of spatial justice, with particular attention to enhancing elderly people’s quality of life. Different strategies to develop more walkable urban environments will be identified through the construction of design scenarios. Facing the challenges that elderly people encounter in walking throughout the city is crucial when urban infrastructural elements are taken into consideration, while solutions acting at a softer level (social and participatory activities), to be effective, should promote walkability for all members of society, regardless of their age or other specific conditions
La città: bisogni, desideri, diritti. Dimensioni spazio-temporali dell'esclusione urbana
No full textLa descrizione delle periferie e la loro localizzazione territoriale all’esterno o nel corpo delle città ha avuto considerazioni diverse nell’analisi sociologica – in relazione alle loro origini, ai cambiamenti e alle diverse localizzazioni in diretta relazione con il loro sviluppo nelle diverse società e in epoca diversa. Il volume ne offre una descrizione in relazione alle modalità di approccio dei diversi autori in diversi epoche e contesti urbani e in seguito formula un modello di analisi fondato sulle varie fonti della letteratura sociologica, così da giustificare e apprezzare diverse modalità di approccio e le descrizioni fornite, fondate su sicure basi conoscitive, tali da mostrarne la morfologia, le variabilità e le diverse funzion
Mediterranean sapropels: a mere geological problem or a resource for the study of our changing planet?
No full textSapropels are sediments rich in organic carbon occurring cyclically in the Mediterranean marine records and whose origin has been matter of great debate during the last decades. While the first sapropels were found in eastern Mediterranean sediments from the Miocene period, in this paper we focus on the layers that were subsequently found in sediment cores of Pliocene to Quaternary age from the eastern Mediterranean mostly. Since the very beginning of the history of studies on sapropels, authors inferred that those levels, being interbedded as dark layers in more or less normal light “open marine” sediments, formed during short-lived but catastrophic alterations in Mediterranean oceanographic conditions, probably linked to broader climate changes. In this paper, the main hypotheses regarding the origin of those sediments are described and we highlight the importance of sapropel records for the study of climatic and oceanographic variability in the Mediterranean area in the context of global climate change
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