1,720,954 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
Studies of hollow cathode He-Cd lasers
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Studies of hollow cathode He-Cd lasers
Get PDFNovel segmented-electrode discharge tubes which operate as sealed-off He-Cd hollow cathode lasers and which do not require a flowing gas system to distribute cadmium vapour are reported. The electrode geometry is arranged to produce a net axial electric field so that cadmium distribution is enhanced by cataphoresis,' a process which is not normally associated with He-Cd hollow cathode lasers. The conditions under which the segmented-electrode tubes exhibit the properties of hollow cathode discharges are determined from their current and voltage characteristics. One system studied consists of alternate anode and cathode segments with glass insulating sections arranged axially, and behaves as a series of hollow cathode discharges under appropriate conditions. Each anode/hollow cathode pair is separated from its neighbouring segments by insulating glass sections of length D, which provide a recombination site and prevent adjacent discharges from overlapping each other. A calculation shows that adjacent discharges will remain isolated provided that D> 2.85cm, in helium at 10 Torr and 700 K. Another segmented-electrode system studied consists of a series of metal segments equal in length. This system does not have discrete anode segments and exhibits the positive Volt-Ampere (VI) characteristics normally expected of, hollow cathode discharges only at low values of discharge current. A transition point in the characteristics exists, and, for discharge currents above this, the VI slope is negative. This behaviour is explained in terms of the plasma length, which is defined as the axial extent of the negative glow within a cylindrical segment, and which increases with increasing discharge current. At low values of discharge current (several mA), the plasma length is less than the length of the metal segments, and the discharge tube operates as a series of hollow cathodes. Under these conditions, each segment has a negative glow discharge partially penetrating the bore from one end, while the other end performs as an anode for the next segment, and so on. The last segment is at power supply earth potential and has no anodic function. The transition points in the VI characteristics occur when the discharge current is increased to a value such that the plasma length equals the length of the metal segments. For discharge currents above this value, only the last segment at power supply earth potential continues to operate as a hollow cathode. The results of these studies provide guidelines for the design of segmented-electrode He-Cd hollow cathode laser discharge tubes in terms of the axial order and optimum spacing of anode and cathode segments. It is shown that large axial temperature variations can exist in thin-walled (0.9mm) hollow cathode structures, implying that the current density distribution at the cathode surface is not uniform. A differential equation is derived to describe heat flow within a cylindrical conductor heated at one end and cooled by natural convection and radiation along its length. Approximate solutions are obtained for both thick-walled and thin-walled conductors. The results of the thick-walled approximation yield thermal design criteria for hollow cathodes, where moderate cathode temperatures (350°C) and minimal axial temperature variations are required. The thin-walled approximation yields results which provide design criteria for the protection from high temperature failure of components such as cylindrical glass/metal seals and 'O' rings. (Abstract shortened by ProQuest.
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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