Search results for "PETRA"
showing 10 items of 89 documents
Measurement of the charged particle multiplicity distribution in hadronic Z decays
1991
The charged particle multiplicity distribution of hadronic Z decays was measured on the peak of the Z resonance using the ALEPH detector at LEP. Using a model independent unfolding procedure the distribution was found to have a mean = 20.85 +/- 0.24 and a dispersion D = 6.34 +/- 0.12. Comparison with lower energy data supports the KNO scaling hypothesis in the energy range square-root s = 29-91.25 GeV. At square-root s = 91.25 GeV the shape of the multiplicity distribution is well described by a log-normal distribution, as predicted from a cascading model for multi-particle production. The same model also successfully describes the energy dependence of the mean and width of the multiplicity…
Per una storia della Settimana Santa a Malta. I gruppi processionali del Venerdì Santo di Valletta
2013
L’articolo ricostruisce la storia dei riti della Settimana Santa e delle processioni per il Venerdì Santo a Malta, in relazione al più ampio contesto mediterraneo e, pertanto, alla tradizione dei pasos in Spagna e dei “misteri” di Trapani ed Erice. Viene evidenziato il ruolo cruciale svolto a partire dalla fine del XVI secolo dai frati Francescani, la cui presenza si rivelò determinante per la nascita e, in seguito, per la diffusione e la fortuna di tali rappresentazioni processionali, anche grazie al fatto che nel corso dei secoli la devozione per la Passione di Cristo a Malta fu alimentata dalla presenza di ben due crocefissi lignei dello scultore siciliano frate Innocenzo da Petralia. In…
Phytosociological study of the acidophilous deciduous oak woods with Ilex aquifolium of Sicily
2009
We present here a phytosociological study with ecological considerations of some formations with a prevalence of Quercus pubescens s.l. and Ilex aquifolium that occur on siliceous ground in the Madonie and Peloritani Mountains of Sicily. On the basis of this study, these formations have been attributed to two new associations: Ilici aquifolii-Quercetum leptobalani and Conopodio capillifolii-Quercetum congestae, within the order Quercetalia pubescenti- petraeae, which is already represented by other associations in Sicily.
Trophic structure of vermetid reef community: High trophic diversity at small spatial scales
2013
Stable isotopes were used to investigate contributions of autochthonous (i.e. benthic: epilithon and macroalgae) and allochthonous (i.e. pelagic: phytoplankton) organic matter sources to the diet of suspension-feeders, grazers and predators associated to small reef-pools (cuvettes) created by the reef-building species Dendropoma petraeum in the north-western coast of Sicily (Italy). Contributions of potential food sources were calculated using Bayesian mixing-models and integrated to a multivariate approach to highlight the diversity of C and N pathways within Dendropoma cuvettes. Both pelagic and benthic organic matter sources were exploited by benthic consumers, although clear differences…
Drawing the Line at Neglected Marine Ecosystems: Ecology of Vermetid Reefs in a Changing Ocean
2016
Vermetid mollusks form reefs that protect coasts from erosion, regulate sediment transport, serve as carbon sinks, and provide habitat for many fish and invertebrates. This biogenic habitat is found in tropical, sub-tropical, and warmtemperate coastal areas, such as Bermuda, oceanic islands in Brazil, and Hawaii, several locations within the Caribbean and the Mediterranean. These reefs are functionally similar to tropical coral fringing reefs but are built by gregarious vermetid gastropods cemented by a crustose coralline algal species, which probably triggers their settlement. Some descriptive studies in different regions worldwide and comparisons among tropical and Mediterranean reefs con…
Indagine sul contributo delle fonti bentoniche e planctoniche alla rete trofica del reef a vermeti
2009
Assessing vermetid reefs as indicators of past sea levels in the Mediterranean
2020
Abstract The endemic Mediterranean reef building vermetid gastropods Dendropoma petraeum complex (Dendropoma spp) and Vermetus triquetrus develop bio-constructions (rims) on rocky shorelines at about Mean Sea Level (MSL) and are therefore commonly used as relative sea-level (RSL) markers. In this study, we use elevations and age data of vermetid reefs to (1) re-assess the vertical uncertainties of these biological RSL indicators, and (2) evaluate the vertical growth rates along a Mediterranean east-west transect, in attempt to explain the differences found in both growth rates and uncertainties. In Israel, Differential Global Positioning System (DGPS) and laser measurements relative to the …
Contribution of planktonic and benthic food sources to the diet of the reef-forming vermetid gastropod Dendropoma petraeum in the western Mediterrane…
2012
Abstract In the Mediterranean Sea, the vermetid Dendropoma petraeum (Monterosato, 1884) forms highly biodiverse reefs that have received increasing attention in recent years although very little is known about the food habit of this species. The main goal of this study was to describe the trophic role of planktonic and benthic food sources for D. petraeum . Specimens from three morphological zones of the reef (inner edge, cuvette and outer edge) at two sites with different wave exposure along the north-western coast of Sicily (Italy; western Mediterranean) were compared for δ 13 C and δ 15 N. Isotopic determinations were also carried out on potential food sources identified in epilithon, re…
Crocifissi di frate Umile e di frate Innocenzo tra la Spagna e Malta
2013
Il saggio prende in esame tre crocifissi lignei che oggi si trovano in Spagna e a Malta, opere dei frati Umile e Innocenzo da Petralia, ricostruendone le vicende storiche attraverso lo studio dei documenti che li riguardano.
Claudio Monteverdi entre acédia e melancolia
2014
Love melancholy is a central aspect of early modern era. Sixteenth century Italy is dominated by Petrach’s model, the acedia, a condition which is characterized by love pain and lack of reciprocity. But during the seventeenth century also a new melancholy feeling appears, a more gentle one characterized by a sweet nostalgia. In the article two compositions by Claudio Monteverdi are compared: Zefiro torna, on a text by Petrarca, for five voices, which is an example of the first idea of melancholy; and Zefiro torna, on a text by Rinuccini (a rewriting of the Petrarchan sonnet), for two tenors and continuo, which is an example of the second one. In the first composition Monteverdi draws upon t…