0000000000617263
AUTHOR
P Messina
La metodologia MYG per eseguire tomografie elettriche 3D su oggetti che presentano una superficie di pregio artistico
La tomografia elettrica di resistività è poco utilizzata nello studio delle murature di edifici di pregio artistico, malgrado le potenzialità in termini di risoluzione: attraverso indagini tridimensionali è infatti possibile ottenere tomografie di resistività 3D dettagliate e rappresentative. La necessità di inserire "chiodini" per immettere la corrente ne limita però l’applicabilità su superfici di pregio. Abbiamo superato questa limitazione sviluppando una metodologia (MYG) che riduce drasticamente rispetto ai metodi classici il numero degli elettrodi utilizzati per immettere la corrente (circa15 volte) ed il tempo di acquisizione (circa 50 volte), permettendo l'uso di elettrodi non invas…
The MYG methodology to carry out 3D electrical resistivity tomography on media covered by vulnerable surfaces of artistic value
Electrical Resistivity Tomography (ERT) is not yet frequently used in the study of walls, floors and foundations of buildings of artistic value, like Ground Penetrating Radar (GPR) or other commoner techniques, although it exhibits a great potentiality in terms of resolution power. The main limitation for the applicability of ERT to the Cultural Heritage field arises from the method of current injection: it is often necessary to drive current electrodes into small perforations on the acquisition surface in order to get a current flow sufficient to obtain a good signal-to-noise ratio. To overcome this limitation the Maximum-Yield Grid (MYG) methodology has been developed, in which only a small fr…
Randomized double-blind placebo-controlled trial of acetyl-L-carnitine for ALS.
Our objective was to assess the effects of acetyl-L-carnitine (ALC) with riluzole on disability and mortality of amyotrophic lateral sclerosis (ALS). Definite/probable ALS patients, 40-70 years of age, duration 6-24 months, self-sufficient (i.e. able to swallow, cut food/handle utensils, and walk), and with forced vital capacity (FVC) > 80% entered a pilot double-blind, placebo-controlled, parallel group trial and were followed for 48 weeks. ALC or placebo 3 g/day was added to riluzole 100 mg/day. Primary endpoint: number of patients no longer self-sufficient. Secondary endpoints: changes in ALSFRS-R, MRC, FVC and McGill Quality of Life (QoL) scores. Analysis was made in the intention-to-tr…
Integrated full 3D geoelectrical and GPR tomographies in the Ambulatory of the roman “Villa del Casale”(Piazza Armerina)
The “Villa del Casale” is a wonderful Roman Villa excavated in the archaeological site of Piazza Armerina (Sicily) in 1929. Its interest is mainly to be referred to the floor mosaics, among the largest and most beautiful ones of Roman times, of superlative quality. The floor of the Corridor is covered by a wonderful mosaic depicting the hunt and capture of wild animals, so that it is called the “Corridor of the Great Hunting Scene”. The Villa is now under restoration, and during the planning of the restoration a 3D electrical resistivity tomography was performed on the corridor by using an acquisition grid composed by 704 electrodes. Furthermore 25 GPR profiles with 400 MHz antenna were acq…
Primi risultati delle indagini su aree archeologiche costiere con metodologie geofisiche integrate (Progetto FIRB2003)
Physical identification of precious artefacts: their sonic imprint
Integrated geochemical and geophysical surveys for a study of sea-water intrusion
Metodologie di microgeofisica per lo studio ed il monitoraggio di manufatti artistici ed ingegneristici
Dopo una breve introduzione sul significato e sulla crescita storica della Microgeofisica, il lavoro è focalizzato su alcune tecniche tomografiche, sviluppate ed implementate dal nostro gruppo di ricerca, che vengono utilizzate prevalentemente (ma non solo) per lo studio ed il monitoraggio dei manufatti di ingegneria edile e per i Beni Culturali costituiti da materiali lapidei, metallici, legnosi, ecc. In particolare, vengono presentate le seguenti tecniche, tutte caratterizzate dalla non invasività, dalla possibilità di applicazione in situ con strumentazione portatile, da una generale speditività applicativa rispetto a tecniche precedenti. 1. La tomografia sonica, ultrasonica (US) ed elet…
Resolution in wave-field tomographic approach
Indagini integrate (magnetometriche e georadar nell’area archeologica di Capo Lilibeo (Marsala, Sicilia Occidentale)
Method of detecting a sonic imprint of a three dimensional object and related apparatus
Non invasive method used to detect a "sonic imprint" of three-dimensional objects, particularly suitable for the identification and monitoring of artworks, consisting in acquiring the vibrations caused by a source of elastic waves and using a set of detectors fixed in various predetermined points of the external surface of the object. An apparatus, cheap and simple to utilize, suitable to execute this method, is also described.