1,720,958 research outputs found
Characterization of a new pixelated diamond detector for fast neutron diagnostics on fusion reactors
Full text linkThis research activity focuses on characterizing an innovative pixelated diamond detector utilizing Timepix3 (TPX3) chip technology. This detector combines a polycrystalline diamond with the TPX3 chip. Future versions will feature a monocrystalline diamond covering a 14 × 14 mm2 area, achieving a remarkable spatial resolution of 55 μm. The TPX3 chip empowers pixel-wise simultaneous counting, charge measurement, and time recording, enabling precise monitoring of neutron interactions within the diamond, which are manifested as tracks. This capability proves invaluable for multiparametric analysis along a designated line of sight in a Tokamak machine. This is a central objective of this research. We aim to investigate the detector's response to neutrons within the 1-20 MeV energy range, which is critically relevant in nuclear fusion. Furthermore, TPX3's capacity to discriminate against signals from intense background sources, primarily gamma rays and scattered neutrons, is of paramount importance for designing diagnostic systems and the interpretation of data. Equally significant is the detector's ability to capture the temporal evolution of neutron emissions, offering real-time monitoring prospects that can be seamlessly integrated into feedback systems. A pivotal facet of this research involves the development of an algorithm. This algorithm, informed by laboratory measurements and Monte Carlo simulations, elucidates the distribution of pixel patterns generated in the diamond by primary neutron reactions. Its application to experimental data will facilitate the determination of the neutron spectrum. Specifically, the thesis is organized as follows. The first two chapters introduce the scientific context in which this research unfolds, presenting essential insights into the fundamental properties of neutron emissions from fusion plasmas. Chapter 3 reviews neutron detection systems, focusing on the Timepix3 detector. Its unique capabilities are showcased through two applications: radon decay product and thermal neutron monitoring using a 6LiF converter. These applications highlight the potential of these detectors as track detectors, particularly their ability to discriminate particles through morphological track analysis. Chapter 4 provides a comprehensive overview of the Diamondpix detector. The chapter discusses the properties of diamonds and presents the results of characterization studies of the Diamondpix detector. Finally, in Chapter 5, the potential of Diamondpix as a detector for fast neutrons is explored. Measurements were conducted at FNG (ENEA Frascati) and n_TOF (CERN). At FNG, the response of Diamondpix to 2.5 and 14 MeV neutrons from D-D and D-T reactions was characterized. The neutron efficiency at the two energies was also estimated. At n_TOF, time-of-flight measurements with Diamondpix were performed. Track analysis was carried out at different neutron energies, and Diamondpix was energy calibrated. The Diamondpix charge response was analyzed, and the FNG and n_TOF results were compared. Charge profiles were analyzed and compared with Monte Carlo simulations
Rischi chimici ed organizzativi come probabili fattori causali di gastroduodenopatie nei lavoratori
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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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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