102,911 research outputs found
Seismic stratigraphy and marine magnetics of the Naples Bay (Southern Tyrrhenian sea, Italy): the onset of new technologies in marine data acquisition, processing and interpretation
Get PDFSeismic stratigraphy and marine magnetics in the case histories of the Somma-Vesuvius volcanic complex, Phlegrean Fields offshore and Ischia and Procida islands offshore (Naples Bay, Southern Tyrrhenian sea) are here discussed. Detailed geo-volcanologic setting of these areas is presented to give a better framework of the presented data. Seismo-stratigraphic techniques and methodologies are discussed, focussing, in particular, on the Naples area, where the Quaternary volcanic activity prevented the application of classical stratigraphic concepts, due to the occurrence of interlayered sedimentary sequences and intervening volcanic bodies (volcanites and volcaniclastites). The onset of new technologies in marine data acquisition, processing and interpretation is also discussed taking into account some historical aspects
The opening of the natural harbour of Ischia (Italy)
No full textWe examine recent and historical sources with a view to
reconstructing the circumstances leading in 1854 to the opening
of the natural harbour of Ischia, the execution phases of the works
and the morphological changes arising. Since the late 17th
century Ischia, an active volcanic island, has been a major
European destination for spa treatment. It underwent a period of
change after the harbour was opened up, which represented not
only an outlet towards the mainland but also an important factor
of social and cultural aggregation for the island. Our analysis also
accounts of the geology of Ischia Harbour, the observations of the
current state of the island and issues concerning the increase in
volcanic and seismic risk resulting from urban expansion and the
increase in tourism since the first half of the 20th century.PublishedPisa3.5. Geologia e storia dei vulcani ed evoluzione dei magmi3.10. Storia ed archeologia applicate alle Scienze della Terraope
The opening of the natural harbour of Ischia (Italy)
No full textWe examine recent and historical sources with a view to
reconstructing the circumstances leading in 1854 to the opening
of the natural harbour of Ischia, the execution phases of the works
and the morphological changes arising. Since the late 17th
century Ischia, an active volcanic island, has been a major
European destination for spa treatment. It underwent a period of
change after the harbour was opened up, which represented not
only an outlet towards the mainland but also an important factor
of social and cultural aggregation for the island. Our analysis also
accounts of the geology of Ischia Harbour, the observations of the
current state of the island and issues concerning the increase in
volcanic and seismic risk resulting from urban expansion and the
increase in tourism since the first half of the 20th century.PublishedPisa3.5. Geologia e storia dei vulcani ed evoluzione dei magmi3.10. Storia ed archeologia applicate alle Scienze della Terraope
Three posterior percutaneous celiac plexus block techniques. A prospective, randomized study in 61 patients with pancreatic cancer pain
No full textVariations and refinements of the classic retrocrural technique of neurolytic celiac plexus block (NCPB) for pancreatic cancer pain (PCP) have been proposed over the last 30 yr to improve success rates, avoid complications and enhance diagnostic accuracy. The aim of this prospective, randomized study was to assess the efficacy and morbidity of three posterior percutaneous NCPB techniques in 61 patients with PCP. The 61 patients were randomly allocated to three NCPB treatment groups: group 1 (20 patients, transaortic plexus block); group 2 (20 patients, classic retrocrural block); and group 3 (21 patients, bilateral chemical splanchnicectomy). The quality and quantity of pain were analyzed before and after NCPB. No statistically significant differences (P greater than 0.05) were found among the three techniques in terms of either immediate or up-to-death results. Operative mortality was nil with the three techniques and morbidity negligible. NCPB abolished celiac PCP in 70-80% of patients immediately after the block and in 60-75% until death. Because celiac pain was only a component of PCP in all patients, especially in those with a longer time course until death: 1) abolition of such pain did not ensure high percentages of complete pain relief (immediate pain relief in 40-52%; pain relief until death in 10-24%); 2) NCPB was effective in controlling PCP in a higher percentage of cases if performed early after pain onset, when the pain was still only or mainly of celiac type and responded well to nonsteroidal antiinflammatory drug therapy; and 3) the probability of patients remaining completely pain-free diminished with increased survival tim
New insights into Late Pleistocene explosive volcanic activity and caldera formation on Ischia (southern Italy)
No full textA new pyroclastic stratigraphy is presented for
the island of Ischia, Italy, for the period ∼75–50 ka BP. The
data indicate that this period bore witness to the largest
eruptions recorded on the island and that it was considerably
more volcanically active than previously thought.
Numerous vents were probably active during this period.
The deposits of at least 10 explosive phonolite to basaltictrachyandesite
eruptions are described and interpreted.
They record a diverse range of explosive volcanic activity
including voluminous fountain-fed ignimbrite eruptions,
fallout from sustained eruption columns, block-and-ash
flows, and phreatomagmatic eruptions. Previously unknown
eruptions have been recognised for the first time
on the island. Several of the eruptions produced pyroclastic
density currents that covered the whole island as well as the
neighbouring island of Procida and parts of the mainland.
The morphology of Ischia was significantly different to that
seen today, with edifices to the south and west and a
submerged depression in the centre. The largest volcanic
event, the Monte Epomeo Green Tuff (MEGT) resulted in
caldera collapse across all or part of the island. It is shown
to comprise at least two thick intracaldera ignimbrite flowunits,
separated by volcaniclastic sediments that were deposited during a pause in the eruption. Extracaldera deposits
of the MEGT include a pumice fall deposit emplaced
during the opening phases of the eruption, a widespread
lithic lag breccia outcropping across much of Ischia and
Procida, and a distal ignimbrite in south-west Campi Flegrei.
During this period the style and magnitude of volcanism was
dictated by the dynamics of a large differentiated magma
chamber, which was partially destroyed during the MEGT
eruption. This contrasts with the small-volume Holocene
and historical effusive and explosive activity on Ischia, the
timing and distribution of which has been controlled by the
resurgence of the Monte Epomeo block. The new data
contribute to a clearer understanding of the long-term
volcanic and magmatic evolution of Ischia.Published583-6033.5. Geologia e storia dei sistemi vulcaniciJCR Journalreserve
L’isola di Ischia: qualche cenno su geografia, geologia e archeologia
No full textI pochi dati riuniti in questi paragrafi non hanno la pretesa di voler riassumere anni di importanti ricerche pregresse – geografiche, geologiche e archeologiche – a Ischia; il loro scopo è semplicemente quello di fornire alcuni punti di riferimento necessari per la comprensione dello studio effettuato sulle fornaci ceramiche di Lacco Ameno.
Riassumere i dati geologici e archeologici relativi all’isola di Ischia, interessantissima dal punto vista geologico e per la sua storia millenaria, non è infatti impresa facile e forse non è un caso se ancora manca un lavoro complessivo sulla storia dell’archeologia dell’isola, nonostante numerosi siano ormai i contributi importanti relativi ad epoche diverse
The Seismicity of Ischia Island
No full textIschia is a volcanic island, west of the caldera of Campi Flegrei, southern Italy. Since the deployment of a modern seismic network in 1970, until the 21 August 2017 earthquake, the seismicity of Ischia has been characterized by low-magnitude (Md ≤ 2:3) earthquakes located in the northern part of the island, mostly beneath the town of Casamicciola Terme at very shallow depths (∼500 m). Some of these events seem to have occurred on the same seismogenetic structure in the northern part of the island. This area coincides with that where the devastating events of 1881 and 1883 occurred and where the small-magnitude seismicity recorded between 1927 and 1936 was located. The August 2017 seismic sequence affected the same area. The current network configuration is able to locate shallow events with Md ≥ 1:0 and to detect smaller earthquakes or other types of natural and artificial events (e.g., blast fishing, geothermal well explosions; see The Seismic Network section). Here, we present the catalog of earthquakes recorded on Ischia between 1999 and February 2018 and compare the August 2017 seismic sequence with the background seismicity. Furthermore, we identified a sequence of events possibly linked to the explosion of a geothermal well on the island.This work benefited of the project “Sale operative integrate e reti di monitoraggio
del futuro: l’INGV 2.0,” Fondo integrativo speciale per la ricerca (FISR) anni 2016 e 2017 (Delibera n. 78/2017).
Furthermore, this work benefited of the agreement between Istituto Nazionale di Geofisica e Vulcanologia and Italian Department of Civil Protection (DPC).Published1750-17606V. Pericolosità vulcanica e contributi alla stima del rischioJCR Journa
Il ruolo dei blocchi anestetici nella diagnosi differenziale del dolore
No full textViene discusso il ruolo dei blocchi anestetici nella diagnosi differenziale del dolor
[Psychologic implications in loco-regional anesthesia]. FT Implicazioni psicologiche in anestesia loco-regionale.
No full textNeurolesive procedures in the treatment of malignant bone pain: vertebral pain relief by unilateral percutaneous cervical cordotomy.
No full textAbstract
Unilateral percutaneous cervical cordotomy, performed in humans to relieve intractable cancer pain, elicits signs of ipsilateral sympathetic block. The primary somatosensory cortex (S1) in adult animals and humans is capable of rapid modification after deafferentation. These plastic changes may account for a loss of tonic control by nociceptive inputs over inhibitory mechanisms within structures of the dorsal column-medial lemniscal system. Most studies, however, have been performed under conditions where deafferentation of C and A delta fibres coexists with large-diameter fibres deafferentation. In this study the effect of the acute lesion of one ascending anterior lateral column on neuronal activity within the dorsal column-medial lemniscal system was assessed
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