1,720,957 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Monitoring of Damage Due to Alkali Silica Reaction in Concrete at Different Temperatures by Using Non-destructive Testing Methods
No full textInternational audienceOne of the factors influencing ASR is temperature and researches have been done on relating temperature and ASR expansion. However, the relationship between temperature, ASR expansion and damage is still not clearly understood. Additionally, non-destructive testing (NDT) methods have proven that they can be used in detecting ASR in mortar and plain concrete. In this context, this research aims to use NDT to monitor damage induced by ASR in concrete with a goal of establishing a relationship between temperature, ASR expansion and damage. This aim was achieved by experiments of ASR in plain concrete cylindrical specimens exposed to temperatures of 20, 38 and 60 ℃ while fully immersed in water. The specimens’ expansions were measured by a length comparator. The damage was monitored by NDT methods of linear vibration analysis, resistivity and permittivity. The results showed a rapid ASR expansion at 60 ℃ from beginning while at 38 ℃, a latent expansion at first then rapid expansion later can be observed. The static and dynamic elastic modulus were sensitive to ASR damage as they reduced with ASR progression compared with compressive strength that did not show a reduction with ASR development. In electromagnetic tests, permittivity was found to be more sensitive to the detection of ASR compared with resistivity. The monitoring is still in progress and final results will be used in ASR modelling towards developing better monitoring for concrete structures affected by ASR
Monitoring the water saturation and damage in reinforced concrete subjected to alkali-silica reaction gradient by non-destructive testing
No full textInternational audienceAlkali silica reaction (ASR) is a harmful swelling pathology in concrete influenced by various factors such as moisture levels and stress conditions. In order to evaluate ASR-damaged structures, it is essential to characterize in situ water saturation gradients and to quantify the influence of reinforcement on ASR-induced damage. This research aims to assess the capability of different non-destructive testing (NDT) methods to evaluate moisture gradients in the context of ASR as well as the damage arising from expansion gradients in presence of reinforcement. Plain and reinforced concrete specimens were cast using both reactive and control composition. After curing, the specimens were fully, half-immersed and quarter-immersed in water at 38 °C to monitor the effects of ASR under varying water saturation conditions. The physicochemical conditions were characterized using permittivity tests. Expansion and damage were monitored through two-dimensional length change measurements, linear vibration analysis, acoustic emission (AE) and crack observations. This paper proposes an original method involving AE monitoring during mechanical loading following expansion. The linear vibration method was found to correlate the extent of damage with average expansion, regardless of the moisture gradient or presence of reinforcement. The acoustic emission during mechanical loading, along with crack observation techniques, effectively localized damage resulting from moisture gradients and reinforcement effects. The discussion highlights the complementary nature of these two techniques for monitoring the damage in both plain and reinforced concrete subjected to ASR
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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