1,721,327 research outputs found
Online software time calibration for a continuous air shower array
No full textTime calibration is a crucial item for a shower array performance as it uses the time of flight method to reconstruct the arrival direction of the primary particle. This paper presents a software time calibration algorithm exploiting the continuous detector feature and based on the assumption of locally flat shower front; accordingly, taken a small portion of the detector (tens of ), a simple time-position fi t of the arriving particles provides the time calibration constants of that part of detector. In a second step, the time offsets among the different portions are measured and the complete detector calibration is obtained. The implementation of this algorithm in an online environment like the ARGO-YBJ data acquisition system has been studied. The results of this investigation are reported and discussed
Online software time calibration for a continuous air shower array
No full textTime calibration is a crucial item for a shower array performance as it uses the time of flight method to reconstruct the arrival direction of the primary particle. This paper presents a software time calibration algorithm exploiting the continuous detector feature based on the assumption of locally flat shower front. On the small portions of the detector (tens of m2) a simple time-position fit of the arriving particles provides the time calibration constants of that part of detector. Then, a second step is needed to measure the time offset among the different portions obtaining the complete detector calibration. This algorithm is applied to ARGO-YBJ detector with a high trigger rate (several kHz) by means of an online processing and its performance is discussed
Spatial correlations applied to gamma/hadron discrimination in the ARGO-YBJ experiment
No full textFollowing recently proposed approaches on gamma/hadron separation, spatial correlations among secondary charged particles in extensive air showers have been studied for the case of the ARGO-YBJ experiment, which represents a particularly suited detector in this respect because of its “continuous-carpet” geometry. Two different types of statistics have been considered, namely the nearest-neighbor spacing distribution (NNSD) and the variance of the number of secondary particles at given distance. The results of this preliminary investigation are reported
CALPRO, an unconventional calorimetry approach
No full textWe propose a calorimetry approach unconventional and innovative. The method is based on the measurement of the lateral distribution of charged particles around the shower axis, it has been used for the first time in the energy determination of Extensive Air Showers at very high energy (>100 TeV) with single layer detector, providing an energy determination with resolution of about 10% for energies above 100 TeV. It has some peculiar characteristics which can be summarized in the following three points: (1) measurement of the shower energy by means of a single sampling; (2) calorimetry which renounces the classic concept of containment of the shower; (3) possibility to separate primary masses. In order to extend this technique at lower energies, specific simulations have been performed through GEANT4 in the energy range 100 GeV–10 TeV for different particles
CALPRO—a unconventional calorimetry project
No full textWe propose a unconventional calorimetry approach. The method is based on idea used for the first time in the energy determination of extensive air showers (EAS) at very high energy (> 100 TeV). It has some peculiar characteristics which can be summarized in the following two points: a) measurement of the shower energy by means of a single sampling; b) measurement of the lateral density distribution of charged particles around the shower axis. We studied the validation of this measurement technique to lower energies (100 GeV–10 TeV) by MC calculation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Preface
No full textPREFACE
The second edition of the International Workshop on “Flavour changing and conserving processes” 2017 (FCCP2017) took place on September 7-9, 2017 in Anacapri, Capri Island, Italy. The Workshop was organized by the Physics Department of the University of Naples “Federico II” and by INFN (Istituto Nazionale di Fisica Nucleare) – Sezione di Napoli. The focus has still been continued on the physics of flavour changing and conserving processes, the involved scientific community has been that of experiments like g−2, Mu2e, MEG, Mu3e, COMET, but also that of the K and B meson physics. More than thirty talks were presented covering the theory status as well as the latest results of experiments in various Laboratories of the world. We wish to thank everybody who contributed to the success of the Workshop. The speakers did an excellent job in presenting the latest results and all participants contributed to the success of the Workshop. We look forward to the next edition FCCP2019 when new results are expected, from many sides, especially on the g-2 FRONT.
Giancarlo D’Ambrosio Michele Iacovacci Massimo Passera Graziano Venanzoni Stefano Mastroianni
Editors FCCP201
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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