86,920 research outputs found
High resolution micro-pattern gaseous tracking detectors
No full textMicro-strip gas chambers have excellent localization properties, high rate capability and good granularity, and have been adopted for may experimental set-ups. Two recurrent problems hower have been reported: slow degradation under sustained irradiation, and damaging accidental discharges. New breeds of detectors aim at improving on these crucial points: CAT, micromegas, gas electron multiplier are examples. Very performing, they are more robust and reliable. Two- stage devices, making use of a gas electron multiplier as first element, permit to sustain larger gains in presence of high rates and heavily ionizing tracks. (16 refs)
The Relationship between infrastructure and wildlife: problem, possible project solutions and finished works in Italy
No full textRecent progress in GEM manufacturing and operation
No full textThe Gas Electron Multiplier (GEM) is a robust and ubiquitous device for the proportional amplification of electrons released in a gas by radiation, and can be used as a pre-amplification stage in a cascade of detectors. Using single and double GEM detectors with simple segmented printed circuits for signal read-out, we have achieved full efficiency of detection for minimum ionizing particles. With suitably configured readout electrodes, fast, two-dimensional localization and imaging of radiation has been demonstrated. Extended discharge studies confirm that multiple devices including a GEM amplifier can perform reliably in the harsh operating conditions expected at high luminosity colliders. Applications and developments of GEM detectors for the imaging of single photoelectrons are also briefly discussed. (17 refs)
Development and test of large size GEM detectors
No full textWe discuss the main operating features of GEM detectors, optimized for use as trackers in a high radiation environment. The construction, tests and performances of large prototypes for the COMPASS experiment are also described, as well as the results of an exposure to very high intensity beams. (11 refs)
Development of high gain GEM detectors
No full textWe describe systematic measurements carried out with single and double GEM detectors with printed circuit readout. The maximum safe operating gain has been measured at increasing radiation flux and under exposure to heavily ionizing tracks. Detection efficiency, localization accuracy and cluster size have been measured in a minimum ionizing particle beam. With a suitably configured readout electrode, fast, two-dimensional localization of radiation is demonstrated. (15 refs)
Banca e finanza: i Sauli di Genova nella Roma di Leone X
No full textSecondo molti autori, la scomparsa di Giulio II e l’ascesa di Leone X, ovvero il passaggio della mitra papale da un ligure a un fiorentino, segnarono il declino del potere e del prestigio economico dei genovesi Sauli presso la corte pontificia divenuta nuovamente filo-fiorentina. Alla luce della documentazione romana, questo giudizio può essere rettificato. Nei documenti è infatti evidente una continua e forte dinamicità economica e finanziaria della famiglia genovese, anche durante il pontificato di papa de’ Medici
Variations on the Author
No full text“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
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
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