1,720,982 research outputs found
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
GRANDProto300: a pathfinder with richastroparticle and radio-astronomy science case
No full textInternational audienceThe GRANDProto300 (GP300) experiment is the first stage of the Giant Radio Array for Neutrino Detection (GRAND) project. It will be deployed between 2020 and 2021 in a radio-quiet area, at m of altitude at the rim of the Tibetan plateau, over a total surface of km. The primary goal of GP300 is to demonstrate the viability of the GRAND detection concepts. It will provide a unique test bench to develop and validate new identification and reconstruction techniques for the radio detection of very inclined air-showers, in the perspective of the next stages of GRAND. GP300 also proposes a rich science case, which includes accurate measurements of cosmic-ray and gamma-ray air-showers in the energy range of 30 PeV to 1 EeV, and a wide-field survey of the Epoch of Reionization, and of radio transients such as Giant Radio Pulses and Fast Radio Bursts
Sources et détection d’événements cosmiques de haute énergie
No full textCes dernières années, de nouvelles classes de sources (sursaut radio rapide, fusion d’étoiles à neutron, etc…) ont été découvertes grâce aux progrès de l’astronomie photonique à toutes les longueurs d’ondes. Avec l’avènement de l’astronomie multi-messager, nous avons été capable de les scruter à travers les rayons cosmiques, les neutrinos, les photons et les ondes gravitationnelles. La première partie de cette thèse est dédiée à l’étude des neutrinos de hautes et ultra hautes énergies. Depuis la découverte en 2013 par IceCube d’un flux diffus de neutrinos, deux questions centrales sont apparues : quelles sont les sources de ce flux diffus, et pouvons-nous détecter des neutrinos à plus haute énergie encore (>PeV). Afin d’aider à répondre à ces questions, nous présentons en premier un modèle d’émission de neutrinos de hautes énergies résultant de la fusion d’étoiles à neutron. Nous examinons ensuite la possibilité de radio détecter les gerbes atmosphériques induites par les neutrinos d’ultra hautes énergies, à travers une étude sur l’optimisation d’un tel détecteur, et une analyse détaillée des caractéristiques du signal et de sa reconstruction. La deuxième partie de cette thèse est dédiée à l’étude des sursauts radio rapides (FRB). Ces pulses radio, brefs, cohérents et nombreux, n’ont pas été identifiés encore et de nombreuses inconnues expérimentales persistent. En premier, nous proposons un modèle de source expliquant les taux de sursauts observés. Enfin, nous présentons un programme observationnel, conduit par l’instrument NenuFAR, situé à la Station de Radio Astronomy de Nançay, dédié à l’observation des FRB aux basses fréquences (100MHz).In the last decade, new classes of sources (fast radio burst, binary neutron star mergers, ...) have been discovered thanks to progress in photon astronomy at all wavelengths. With the advent of multimessenger astronomy, we were able to scrutinize them with cosmic rays, neutrinos, photons and gravitational waves. The first part of this thesis is dedicated to the study of the high-energy and ultra-high energy neutrinos. Since the discovery in 2013 by IceCube of a diffuse neutrino flux, two major questions have been raised: what are the sources of this diffuse flux, and can we detect neutrinos at higher energies (> PeV). To help answering these questions, we first present a model of high-energy neutrino emissions from neutron star mergers. We then examine the radio detection of extensive air showers induced by ultra-high-energy neutrinos, with a study of a detector optimisation, and a detailed analysis of the signal characteristics and develops a reconstruction procedure. The second part of this thesis is dedicated to the study of the fast radio bursts. These brief, coherent and numerous radio pulses, have not been identified yet and many experimental unknowns remain. We first propose a source model focusing on the question of the pulses rates. Finally, we present an observational program conducted with the NenuFAR instrument, located in the Nançay Radio Astronomy Station, dedicated to the detection and the characterisation of FRBs at low frequency (<100MHz)
Review of Neutrino Experiments Searching for Astrophysical Neutrinos
No full textInternational audienceOver the last two decades, we have intensified our search for a ghost particle, with the hope that it would provide us with information on the darkest places of our Universe. This quest has been conducted from the deep caves of the Earth, up to the upper layers of our atmosphere, and from one Pole to another. In this review, I will summarize the odyssey of the search for astrophysical neutrinos. I will focus on the recent discoveries and technical developments that led us to the point where we stand now. I will highlight the different types of neutrino detectors, and their performances enabling the discovery of high-energy astrophysical neutrinos, and the understanding of their sources behind. Finally, I will present some possible paths to the remaining uncharted territory of the ultra-high-energy neutrino astronomy
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
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