1,842 research outputs found
‘Coming back Home’ . Il Modello Virtuale della Statua Romana di Asclepio del Museo di Siracusa (Italia)
The colossal torso of the god Asclepius, kept into the Castello Maniace during the Spanish domination of Sicily, is now one of the most significant examples of roman statuary in the Syracuse Museum. The recent restoration of the Castello Maniace has been celebrated in 2008 with an exhibition of archaeological finds obtained in the various excavations of the castle. The statue of Asclepius, which had for centuries been a part of the architecture there, should have been the most significant piece on display. However, its large size and frailty made such a temporary move inadvisable, and it was decided that a plaster cast should be made and exhibited instead. A team of archaeologists and information technicians from the Archeomatica Project of Catania University were able to contribute to this task by creating a 3D model of the statue through the use of laser scanning techniques
The OPERA magnetic spectrometer
The OPERA neutrino oscillation experiment foresees the construction of two
magnetized iron spectrometers located after the lead-nuclear emulsion targets.
The magnet is made up of two vertical walls of rectangular cross section
connected by return yokes. The particle trajectories are measured by high
precision drift tubes located before and after the arms of the magnet.
Moreover, the magnet steel is instrumented with Resistive Plate Chambers that
ease pattern recognition and allow a calorimetric measurement of the hadronic
showers. In this paper we review the construction of the spectrometers. In
particular, we describe the results obtained from the magnet and RPC prototypes
and the installation of the final apparatus at the Gran Sasso laboratories. We
discuss the mechanical and magnetic properties of the steel and the techniques
employed to calibrate the field in the bulk of the magnet. Moreover, results of
the tests and issues concerning the mass production of the Resistive Plate
Chambers are reported. Finally, the expected physics performance of the
detector is described; estimates rely on numerical simulations and the outcome
of the tests described above.Comment: 6 pages, 10 figures, presented at the 2003 IEEE-NSS conference,
Portland, OR, USA, October 20-24, 200
Hand Held 3D Scanning for Cultural Heritage: Experimenting Low Cost Structure Sensor Scan.
In the last years 3D scanning has become an important resource in many fields, in particular it has
played a key role in study and preservation of Cultural Heritage. Moreover today, thanks to the miniaturization
of electronic components, it has been possible produce a new category of 3D scanners, also
known as handheld scanners. Handheld scanners combine a relatively low cost with the advantage of
the portability. The aim of this chapter is two-fold: first, a survey about the most recent 3D handheld
scanners is presented. As second, a study about the possibility to employ the handheld scanners in the
field of Cultural Heritage is conducted. In this investigation, a doorway of the Benedictine Monastery
of Catania, has been used as study case for a comparison between stationary Time of Flight scanner,
photogrammetry-based 3D reconstruction and handheld scanning. The study is completed by an evaluation
of the meshes quality obtained with the three different kinds of technology and a 3D modeling
reproduction of the case-study doorway
Integrated three-dimensional models for noninvasive monitoring and valorization of the Morgantina silver treasure (Sicily)
The Morgantina silver treasure belonging to the Archaeological Museum of Aidone (Sicily) was
involved in a three-dimensional (3-D) survey and diagnostics campaign for monitoring the collection over
time in anticipation of their temporary transfer to the Metropolitan Museum of Art in New York for a period
of 4 years. Using a multidisciplinary approach, a scientific and methodological protocol based on noninvasive
techniques to achieve a complete and integrated knowledge of the precious items and their conservation state,
as well as to increase their valorization, has been developed. All acquired data, i.e., 3-D models, ultraviolet
fluorescence, x-ray images, and chemical information, will be made available, in an integrated way, within a
web-oriented platform, which will present an in-progress tool to deepen existing archaeological knowledge
and production technologies and to obtain referenced information of the conservation state before and after
moving of the collection from its exposure site
Rho primes in analyzing e+e- annihilation, MARK III, LASS and ARGUS data
The results of an analysis are presented of some recent data on the reactions
, with the
subtracted events, , , , , the decays
,
, upon taking into account both the strong energy
dependence of the partial widths on energy and the previously neglected mixing
of the type resonances. The above effects are shown to exert an
essential influence on the specific values of masses and coupling constants of
heavy resonances and hence are necessary to be accounted for in establishing
their true nature.Comment: 20 pages, ReVTeX, 9 Postscript figures As compared to hep-ph/9607398,
new material concerning the analysis of the ARGUS data on the tau decays into
four pion hadronic states is adde
Prospect for Charge Current Neutrino Interactions Measurements at the CERN-PS
Tensions in several phenomenological models grew with experimental results on
neutrino/antineutrino oscillations at Short-Baseline (SBL) and with the recent,
carefully recomputed, antineutrino fluxes from nuclear reactors. At a
refurbished SBL CERN-PS facility an experiment aimed to address the open issues
has been proposed [1], based on the technology of imaging in ultra-pure
cryogenic Liquid Argon (LAr). Motivated by this scenario a detailed study of
the physics case was performed. We tackled specific physics models and we
optimized the neutrino beam through a full simulation. Experimental aspects not
fully covered by the LAr detection, i.e. the measurements of the lepton charge
on event-by-event basis and their energy over a wide range, were also
investigated. Indeed the muon leptons from Charged Current (CC) (anti-)neutrino
interactions play an important role in disentangling different phenomenological
scenarios provided their charge state is determined. Also, the study of muon
appearance/disappearance can benefit of the large statistics of CC muon events
from the primary neutrino beam. Results of our study are reported in detail in
this proposal. We aim to design, construct and install two Spectrometers at
"NEAR" and "FAR" sites of the SBL CERN-PS, compatible with the already proposed
LAr detectors. Profiting of the large mass of the two Spectrometers their
stand-alone performances have also been exploited.Comment: 70 pages, 38 figures. Proposal submitted to SPS-C, CER
Prospects for the measurement of muon-neutrino disappearance at the FNAL-Booster
Neutrino physics is nowadays receiving more and more attention as a possible
source of information for the long-standing problem of new physics beyond the
Standard Model. The recent measurement of the mixing angle in the
standard mixing oscillation scenario encourages us to pursue the still missing
results on leptonic CP violation and absolute neutrino masses. However,
puzzling measurements exist that deserve an exhaustive evaluation. The NESSiE
Collaboration has been setup to undertake conclusive experiments to clarify the
muon-neutrino disappearance measurements at small , which will be able to
put severe constraints to models with more than the three-standard neutrinos,
or even to robustly measure the presence of a new kind of neutrino oscillation
for the first time. To this aim the use of the current FNAL-Booster neutrino
beam for a Short-Baseline experiment has been carefully evaluated. This
proposal refers to the use of magnetic spectrometers at two different sites,
Near and Far. Their positions have been extensively studied, together with the
possible performances of two OPERA-like spectrometers. The proposal is
constrained by availability of existing hardware and a time-schedule compatible
with the CERN project for a new more performant neutrino beam, which will
nicely extend the physics results achievable at the Booster. The possible FNAL
experiment will allow to clarify the current disappearance tension
with appearance and disappearance at the eV mass scale. Instead, a new
CERN neutrino beam would allow a further span in the parameter space together
with a refined control of systematics and, more relevant, the measurement of
the antineutrino sector, by upgrading the spectrometer with detectors currently
under R&D study.Comment: 76 pages, 52 figure
Netrin-1- 3 1 integrin interactions regulate the migration of interneurons through the cortical marginal zone
Cortical GABAergic interneurons, most of which originate in the ganglionic eminences, take distinct tangential migratory trajectories into the developing cerebral cortex. However, the ligand–receptor systems that modulate the tangential migration of distinct groups of interneurons into the emerging cerebral wall remain unclear. Here, we show that netrin-1, a diffusible guidance cue expressed along the migratory routes traversed by GABAergic interneurons, interacts with α3β1 integrin to promote interneuronal migration. In vivo analysis of interneuron-specific α3β1 integrin, netrin-1–deficient mice (α3lox/−Dlx5/6-CIE, netrin-1−/−) reveals specific deficits in the patterns of interneuronal migration along the top of the developing cortical plate, resulting in aberrant interneuronal positioning throughout the cerebral cortex and hippocampus of conditional α3lox/−Dlx5/6-CIE, netrin-1−/− mice. These results indicate that specific guidance mechanisms, such as netrin-1–α3β1 integrin interactions, modulate distinct routes of interneuronal migration and the consequent positioning of groups of cortical interneurons in the developing cerebral cortex
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