188,638 research outputs found
Simulation of a Fast Timing Micro-Pattern Gaseous Detector for TOF-PET and future accelerators
No full textSimulation is a powerful tool for designing new detectors and guide the construction of new prototypes. Advances in photolithography and micro-electronics led to the development of a new family of devices named Micro-Pattern Gas Detectors (MPGDs) [1], with main features: flexible geometry; high rate capability (> MHz/cm2); excellent spatial resolution ( 100µ m); good time resolution (5-10 ns); and reduced radiation length. A new detector layout, named Fast Timing MPGD (FTM), has been recently proposed [2] that would combine both the high spatial resolution and high rate capability of the MPGDs, while improving the time resolution with nearly two orders of magnitude to ~100ps. However charged particle timing with gaseous detector time resolution below 100 ps has been established with another detection scheme [3], this approach might not be able to sustain high particle rates. This contribution investigates the use of the FTM technology for an innovative TOF-PET imaging detector and emphases the importance of full detector simulation to guide the design of the detector geometry and performance
Development of the FTM technology for TOF-PET
No full textGas detector research focused in particular on the radiation induced processes leading to discharge breakdown led, thanks to advances in photolithography and micro-electronics, to the development of a family of resistant devices named Micro-Pattern Gas Detectors (MPGDs) (Titov and Ropelewski 2013, [1]). The main features of the MPGDs are: a flexible geometry; a high rate capability (>MHz/cm2); an excellent spatial resolution
Upgrade of the CMS Muon system with triple-GEM detectors: Performance of the GE1/1 station and detector design and testing of the ME0 station
No full textThe High-Luminosity LHC (HL-LHC) will deliver proton-proton collisions at 5 to 7.5 times the nominal LHC luminosity, with an expected number of 140 to 200 pp-interactions per bunch crossing. To maintain the performance of muon triggering and reconstruction under high background, the forward part of the muon spectrometer of the CMS experiment will be upgraded with Gas Electron Multipliers (GEM) and improved Resistive Plate Chambers (iRPC) detectors. A first GEM station (GE1/1), covering about 50 m(2), was installed during the Long Shutdown 2 (LS2, 2019-2021). Its operation and performance during Run 3 (2022-2025) is described. A second 6-layer station (ME0), covering about 60 m(2), will extend the pseudo-rapidity coverage of the muon system from |eta|<2.4 to |eta|<2.8 and will be installed behind the new high-granularity calorimeter (HGCAL) during the third Long Shutdown (LS3, 2026-2028). ME0 will be exposed to a background rate up to 150 kHz/cm(2) and it required several design modifications. The design and performance under test with beams and irradiation at the GIF++ facility of a prototype 6-layer stack is discussed, and demonstrates that the prototype can operate in the challenging conditions of HL-LHC. The current status of the production and quality control is presented and shows the readiness for installation in 2027
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
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