Search results for "Alta"
showing 10 items of 1309 documents
Bridging the knowledge gap on the distribution and typology of vermetid bioconstructions along the Maltese coastline : an updated assessment
2022
In the Maltese Islands, insufficient attention has been paid to vermetid reefs, endemic Mediterranean bioconstructions widely distributed along the southern part of the basin. As a result, this is a largely-overlooked coastal ecosystem despite the multitude of ecosystem services it provides. The perennial urban development in the Maltese Islands calls for the adoption of urgent action to protect coastal habitats, in particular bioconstructions that increase biodiversity and contribute to mitigating the effects of climate change. The objective of our study was to extensively document the presence and typology of the vermetid reef ecosystems along the coast of Malta and Gozo, assessing the oc…
Digestive Enzymes in Larvae and Juveniles of Farmed Sharpsnout Seabream (Diplodus puntazzo) (Cetti, 1777)
2011
The ontogenetic development and pattern of main digestive enzyme activities (proteases, carbohydrases and lipases) were investigated in farmed sharpsnout seabream Diplodus puntazzo larvae and juveniles, during the passage from the larval stage to adult (from 21 to 277 days after hatching - DAH). Larvae showed exponential growth, thus confirming that Rotifers and Artemia nauplii are suitable preys for early feeding of D. puntazzo larvae. Pepsin activity was low in the larvae, but it increased afterwards in relation with stomach development. In juveniles, levels of specific activity of trypsin, chymotrypsin and elastase were lower compared to that recorded in larvae. A decrease in the activit…
Structure and biodiversity of a Maltese maerl bed : new insight into the associated assemblage 24 years after the first investigation
2022
Maerl beds are biogenic benthic habitats distributed worldwide and known to sustain high productivity and biodiversity levels. In the Mediterranean, the number of studies that have been carried out is limited, and little is known on its real distribution, mostly due to the difficulties of exploring such habitats — Due to the high transparency of Mediterranean waters, maerl can be found at depths of over 50 m making mandatory the use of benthic grabs and ROVs. The last published data from Maltese waters were taken two decades ago. In this present study, we provide new insights on this poorly known habitat, in particular regarding the north western bank, designated as a NATURA 2000 protected …
The Messinian Salinity Crisis deposits in the Balearic Promontory: An undeformed analog of the MSC Sicilian basins??
2021
International audience; The Messinian Salinity Crisis (MSC) is a controversial geological event that influenced the Mediterranean Basin in the late Miocene leaving behind a widespread Salt Giant. Today, more than 90% of the Messinian evaporitic deposits are located offshore, buried below the Plio-Quaternary sediments and have thus been studied mainly by marine seismic reflection imaging. Onshore-offshore records’ comparisons and correlations should be considered a key approach to progress in our understanding of the MSC.This approach has however not been widely explored so far. Indeed, because of the erosion on the Messinian continental shelves and slopes during the MSC, only few places in …
Deformazioni attive in Sicilia Centrale: L'Esempio del vulcanismo sedimentario di Caltanissetta
2009
Influenza delle armature sul comportamento in compressione di colonne in calcestruzzo ad alta resistenza
2010
Risposta sismica di edifici prefabbricati isolati con dispositivi elastomerici
2013
The paper concerns the seismic behavior of precast concrete industrial buildings with an elevation equipped with seismic isolators. It’s examined a building with rectangular plan of m 40x 50. The structure is constituted of columns of square cross-section of 0.6 m, with continuum beams foundation. The desk is made with T section beams for each frame connected by Gerber joints in the main direction and they support precast pre-tensioned tiles with shape. A plate of concrete is casted of the wing tiles for obtain a connected rigid deck. At the top of the pillars will be placed rubber bearings having high dissipation capacity (HDRB). The dynamic behavior of the structure under recorded real …
Criteri semplificati per la stima delle proprietá meccaniche di murature di tamponamento
2009
La campagna di prove descritta al capitolo precedente è stata realizzata con un duplice scopo: determinare in maniera diretta le caratteristiche meccaniche di alcune tipologie di murature in vista delle prove sperimentali su telai tamponati, in modo da disporre di tutti i dati necessari per la modellazione: verificare l’affidabilità delle relazione fornite da codici normativi, che legano le caratteristiche degli elementi componenti la muratura al comportamento meccanico globale del pannello murario, proponendone eventualmente di nuove. Queste leggi semplificano notevolmente la determinazione delle caratteristiche meccaniche per un pannello in muratura sollecitato a compressione e taglio. Al…
Riuso e riciclo nell’industria delle costruzioni: nano-malte fotocatalitiche innovative da scarti industriali valorizzati
2015
Questo lavoro discute della produzione di nanomalte innovative eco-composite per intonaco, progettate per combattere l’inquinamento impattante sull’involucro edilizio. I campioni sono costituiti da calce idraulica naturale funzionalizzata da vari tipi di fotocatalizzatori, prodotti a partire da scarti di industrie siderurgiche ed alimentari. Sono state condotte indagini chimico-fisiche ed, in particolare, è stata valutata l’attività fotocatalitica. Le analisi hanno dimostrato che i predetti scarti possono essere utilmente riciclati per produrre una nuova generazione di materiali da costruzione innovativi, sostenibili, economici e multifunzionali.