12,350 research outputs found

    Status and perspectives of the LHC detectors

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    The paper provides an overview of the current status and main physics results of the LHC experiments. The first part describes the new measurements and major results achieved by ALICE, LHCb, LHCf and TOTEM. The most recent electroweak measurements performed by ATLAS and CMS are then discussed together with the latest searches for SUSY. The very interesting results achieved by the two general-purpose experiments in searching for the Standard Model Higgs boson are lastly discussed together with the prospects for the current 2012 running period

    First physics results from the CMS experiment at the LHC

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    Establishing all major SM processes and beginning the searches for new physics was the major goal of the first run of the CERN Large Hadron Collider. The paper describes the first results obtained by the CMS experiment in studying pp collisions at √s = 7TeV. We present first the measurements performed on W, Z and top quark. We then describe the searches for new physics performed by probing any eventual internal structure of quarks, and by looking for new massive gauge bosons, microscopic black holes and particles hinting at large extra dimensions. The first results on the searches for SUSY and Higgs particles at LHC are lastly discussed together with the prospects for the current 2011-12 running period

    Results of Skylab investigation over Italy

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    The author has identified the following significant results. Multispectral high resolution photography of S190A was successfully applied to the detection of paleoriverbeds in flat lands. Results of SL-3 mission were compared to those of LANDSAT for two regional geological surveys (linear structures) on the islands of Sicily and Sardinia. On Sicily, the seasonal conditions were unfavorable for Skylab while LANDSAT played a major role in discovering long, unknown lineaments of great interest for the geodynamics of the area. On Sardinia, owing to the vegetation type and to the geomorphic conditions, the Skylab imagery was successfully employed to describe the network of linears, both regional and local. Results can be used to study the relationship between linears, actual fracturing and the occurrence of mineral deposits

    Information system on hydrological and geomorphological catastrophes in Italy (SICI): a tool for managing landslide and flood hazards

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    International audienceSince 1990, we have maintained a database of historical information on landslides and floods in Italy, known as the National Research Council's AVI (Damaged Urban Areas) archive. The database was originally designed to respond to a request of the Minister of Civil Protection, and was aimed at helping the regional assessment of landslide and flood risk in Italy. The database was compiled in 1991-1992 to cover the period 1917 to 1990, and then updated to cover systematically the period 1917 to 2000, and non-systematically the periods 1900 to 1916 and 2001 to 2002. The database currently contains information on more than 32000 landslide events occurred at more than 21000 sites, and on more than 29000 flood events occurred at more than 14000 sites. Independently from the AVI archive, we have obtained other databases containing information on damage caused by mass movements and inundations, daily discharge measurements and solid-transport measurements at selected gauging stations, bibliographical and reference information on landslides and inundations, and a catalogue of National legislation on hydrological and geological hazards and risk in Italy. The databases are part of an information system known as SICI (an Italian acronym for Sistema Informativo sulle Catastrofi Idrogeologiche, Information System on Hydrological and Geomorphological Catastrophes), which is currently the largest single repository of historical information on landslides and floods in Italy. After an outline of the history and evolution of the AVI Project archive, we present and discuss: (a) the structure of the SICI information system, including the hardware and software solutions adopted to maintain, manage, update, use and disseminate the information stored in the various databases, (b) the type and amount of information stored in each database, including an estimate of their completeness, and (c) examples of recent applications of the information system, including a web-based GIS system to show the location of sites historically affected by landslides and floods, and an estimate of geo-hydrological (i.e. landslide and flood) risk in Italy based on the available historical information

    Laser induced fluorescence for axion dark matter detection: a feasibility study in YLiF4_4:Er3+^{3+}

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    We present a detection scheme to search for QCD axion dark matter, that is based on a direct interaction between axions and electrons explicitly predicted by DFSZ axion models. The local axion dark matter field shall drive transitions between Zeeman-split atomic levels separated by the axion rest mass energy mac2m_a c^2. Axion-related excitations are then detected with an upconversion scheme involving a pump laser that converts the absorbed axion energy (∼\sim hundreds of μ\mueV) to visible or infrared photons, where single photon detection is an established technique. The proposed scheme involves rare-earth ions doped into solid-state crystalline materials, and the optical transitions take place between energy levels of 4fN4f^N electron configuration. Beyond discussing theoretical aspects and requirements to achieve a cosmologically relevant sensitivity, especially in terms of spectroscopic material properties, we experimentally investigate backgrounds due to the pump laser at temperatures in the range 1.9−4.21.9-4.2 K. Our results rule out excitation of the upper Zeeman component of the ground state by laser-related heating effects, and are of some help in optimizing activated material parameters to suppress the multiphonon-assisted Stokes fluorescence.Comment: 8 pages, 5 figure

    Ultrametric Smale's α\alpha-theory

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    We present a version of Smale's α\alpha-theory for ultrametric fields, such as the pp-adics and their extensions, which gives us a multivariate version of Hensel's lemma.Comment: 4 pages. 2nd version: Correction of errata in the exponents of main theore

    Weak insensitivity to initial conditions at the edge of chaos in the logistic map

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    We extend existing studies of weakly sensitive points within the framework of Tsallis non-extensive thermodynamics to include weakly insensitive points at the edge of chaos. Analyzing tangent points of the logistic map we have verified that the generalized entropy with suitable entropic index q correctly describes the approach to the attractor.Comment: 6 pages, 3 figure

    Particle detection through the quantum counter concept in YAG:Er3+^{3+}

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    We report about a novel scheme for particle detection based on the infrared quantum counter concept. Its operation consists of a two-step excitation process of a four level system, that can be realized in rare earth-doped crystals when a cw pump laser is tuned to the transition from the second to the fourth level. The incident particle raises the atoms of the active material into a low lying, metastable energy state, triggering the absorption of the pump laser to a higher level. Following a rapid non-radiative decay to a fluorescent level, an optical signal is observed with a conventional detectors. In order to demonstrate the feasibility of such a scheme, we have investigated the emission from the fluorescent level 4^4S3/2_{3/2} (540 nm band) in an Er3+^{3+}-doped YAG crystal pumped by a tunable titanium sapphire laser when it is irradiated with 60 keV electrons delivered by an electron gun. We have obtained a clear signature this excitation increases the 4I13/2^{4}I_{13/2} metastable level population that can efficiently be exploited to generate a detectable optical signal

    La procedura di ritiro e di distribuzione alimenti del Banco Alimentare

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    L'articolo analizza una nuova fonte di approvvigionamento per la raccolta e la distribuzione di derrate alimentari eccedenti, appartenenti al genere fresco, a favore di 15 enti no profit. Si definisce una nuova procedura per il ritiro e la logistica di distribuzione in Piemont
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