1,720,990 research outputs found
Pennetta M., Nappi R., Sica M., Stanislao C. e Donadio C.
No full textRiassunto
Il riconoscimento e l’interpretazione di elementi tettonici, litostratigrafici e geomorfologici, antichi o recenti, nonché di strutture geoarcheologiche in quanto geoindicatori, sono utili per ricostruire l’evoluzione dei vari morfotipi costieri, di cui si analizzano alcuni casi studio. I recenti studi dell’ambiente marino costiero della Campania hanno aggiornato il quadro geomorfologico e sedimentario. La suddivisione in principali ambienti (spiaggia emersa e sommersa, falesia e piede di falesia) ha permesso di raggruppare aree con processi simili, attivi o meno, e correlare le forme alle zone emerse. Va studiata anche la fascia dunare, poiché riveste un ruolo basilare nell’equilibrio ambientale del sistema di spiaggia. Gli effetti dell’erosione si riflettono pure sulla vegetazione, che mostra un forte stato di stress. I processi erosivi sono messi in relazione con le pressioni antropiche che hanno agito nel tempo in modo diretto o meno, innescando o accelerando fenomeni che riducono la resilienza del sistema naturale.
Abstract
Recognition and interpretation of tectonic, lithostratigraphic and geomorphic elements, ancient or recent, and geoarchaeological structures, represent useful geoindicators to reconstruct coastal dynamics. The recent coastal geological mapping of Campania provided a new reading of the coastland. In this way, the surveys update the whole geomorphologic and sedimentologic framework. Sea cliff and cliff base, emerged and submerged beach should be surveyed, with the aim to group waterscapes with same processes and correlate their shapes. Also the coastal dune should be studied, as it plays a key role in the balance of a littoral for its positive effect on beach system. Among factors contributing to coastal erosion, the anthropogenic pressure acts a reduction of resilience of natural syste
MORPHOLOGICAL CONTROL ON SEDIMENT DISPERSAL ALONG THE SOUTHERN TYRRHENIAN COASTAL ZONES (ITALY).
No full textMORPHOLOGICAL CONTROL ON SEDIMENT DISPERSAL ALONG THE SOUTHERN TYRRHENIAN COASTAL ZONES (ITALY).
No full textGeomorphological evolution of the Sabaudia Lagoon, Tyrrhennian Sea, cenral Italy,Evoluzione morfologica della Laguna di Sab{\`a}udia (Mar Tirreno, Italia centrale)
No full textLa laguna di Sabàudia possiede una geometria a pettine, unica in Italia e forse in Europa, con sei bracci ortogonali alla linea di riva; si è impostata su un paesaggio ereditato e si è evoluta a partire dall'Olocene medio fino ad assumere l'attuale assetto fisiografico. Le indagini geomorfologiche condotte lungo le aree emerse e sommerse della laguna, unitamente ai risultati di analisi morfostratigrafiche, hanno consentito di definire l'evoluzione dell'ambiente lagunare in relazione alla paleomorfologia costiera, agli apporti sedimentari, alle variazioni del reticolo idrografico ed ai fenomeni eustatici tardo-quaternari
Silica treatments: a fire retardant strategy for hemp fabric/epoxy composites
No full textDespite its current limited availability, hemp is raising interest for green composite manufacturing, as it is cheap renewable resource and shows low density, high specific strength with respect to glass or aramid fibers and good biodegradability as well. In this work, the flame retardancy of hemp fabric/epoxy composites is investigated, exploiting either the in situ formation of silica nanoparticles in the epoxy epoxy or specific surface treatments of hemp fabrics with acidified waterglass solutions. To this aim, Tetraethoxysilane (TEOS) and 3-aminopropyl triethoxysilane (APTS, as coupling agent) were used as silica precursors in a commercially available bisphenol resin cured with cicloaliphatic polyamines. The final curable mixture was fluid enough to assure good impregnation of the hemp fabrics. Composites were produced through impregnation of 6 hemp fabric layers with the mixture of silica containing epoxy resin and curing agent. The cure was performed at room temperature for 15 d. The fire behavior of the composites was assessed by cone calorimetry tests and the results were compared to those obtained for the same systems without silica nanoparticles and hemp surface treatment. These modifications promoted a significant reduction of heat release rate (35%), as well as an important decrease of the released smokes (namely, -8% of total smoke release and -21% of specific extinction area
Pliocene to Quaternary morphotectonic evolution of the Gaeta Bay, Tyrrhenian coastal belt, central Italy: A review
No full textThe coastal landscape of the Gaeta Bay, southern Latium (Italy), is the result of a significant tectonic control expressed by a geometric segmentation of the relief and by offsets of the coastline. The structural features derived from this activity are overlain by slope and littoral morphogenetic processes. Tectonic and geomorphic processes performed in a different way along the coastal belt, producing the unequal morphological setting observed in the western and in the eastern sector of the study area. In the western sector, the Aurunci Mts. gradually reach the coast forming cliffs. On them, several emerged and submerged erosional forms such as notches and sea terraces are recognised. Embayments characterized by sandy pocket beaches wide from few hundred meters to over 2 km are in correspondence to some tectonic lines with a clear morphological expression and transversal to the coastline. In the eastern sector, the Aurunci Mts., higher and rich of karstic forms, joint to the coastline in few kilometres due to the accumulation forms developed along valleys deeply cut in the carbonate slopes. The morphological features of the investigated area permitted us to recognize the existence of differential vertical movements along a 30 km-wide coastal area clearly split in two sectors
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
