1,721,099 research outputs found
A PMT interface for the Optical Module front-end of a neutrino underwater telescope
No full textA proposal for a new system to capture signals in the optical module (OM) of an underwater neutrino telescope is described. It concentrates on the problem of power consumption and the time precision. In particular, a solution for the interface between the photomultiplier (PMT) and the front-end electronics is presented
Sant’Imbenia (Alghero): further archaeometric evidence for an Iron Age market square
No full textLead isotope compositions were determined for 18 metal objects from the archaeological site of Sant'Imbenia, NW Sardinia, dating to the end of the 9th century BCE onwards. The provenance of some objects is unambiguously traced to SW Sardinia, other objects could derive either from central Sardinia or the Iberian coastal ranges. The variety of the provenances attests to a wide trade network that spanned the entire island of Sardinia and extended to the Iberian sites
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
A study on large area Hamamatsu photomultipliers for Cherenkov neutrino detectors
No full textMany of the existing neutrino telescopes use large area photomultipliers integrated into transparent glass vessels to make the detection element called ''optical module''. The characteristics of the photomultipliers have a severe impact on the performance of the whole detectors. This paper describes a large work of characterization of large area photomultipliers performed in the frame of R&D activities of large volume underwater neutrino detectors. Dedicated studies are also reported about noise pulses, super bialkali photocathode photomultipliers, ageing effects, influences of the Earth's magnetic field and on the effects of the external glass vessels on the optical module's noise pulses
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