1,720,962 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
The effect of sodium hypochlorite on the elimination of E. Faecalis using rotary instrumentation and intermittent passive ultrasonic irrigation
No full textOBJECTIVE: The purpose of this study was to evaluate in vitro the effect of different variables (delivery system, surface
contact with the irrigant, the frequency of changing the irrigant and the total volume of the irrigant) of sodium hypochlorite on
the elimination of E. faecalis using rotary instrumentation and intermittent passive ultrasonic irrigation (IPUI). MATERIALS
and METHODS: Sixty extracted single-rooted teeth were instrumented up to size 20 K-file, then inoculated with E.
faecalis. The root canals were prepared up to a # 40 using 0.04 profile rotary files and irrigated with 2 ml of 2.25% NaOCl.
Ultrasonic P5 with NiTi file # 25 was oscillated for 30 seconds after # 30 file, at the end of the preparation, and after NaOCl
was left in situ for 5 minutes to complete 15 minutes of preparation. A total volume of 10 ml of sodium hypochlorite was
used. The root canals were divided equally into four experimental and one control groups. In Group I, pipette was used
to deliver the irrigant; Group II, the total contact time of irrigant was 30 minutes; Group III, the canal was flushed every
2 minutes; Group IV, the total volume of the irrigant was 20 ml and in Group V (control), chemo-mechanical preparation
was carried out without IPUI. The root canals were sampled before and after instrumentation and the zone of bacterial
growth were measured in mm and recorded. RESULTS: A significant bacterial reduction was demonstrated in Groups I
(P=0.020), II (P=0.001), and IV (P=0.000) as compared to Groups III and V. CONCLUSIONS: The results of this study
showed that the flushing action, the larger volume of sodium hypochlorite irrigant and the increase in the contact time of
the irrigant combined with rotary instrumentation and IPUI enhanced the elimination of E. faecalis from the root canal.This study was supported by the
College of Dentistry Research Center, King Saud University, (F # 1094).Corresponding Author:
Dr. Hanan A. Balto, Assistant Professor
Department of Restorative Dental Sciences
College of Dentistry, King Saud University
P.O. Box 62645, Riyadh 11595, Saudi Arabia
Email: [email protected]
A new model for pre-clinical teaching of endodontic procedure
No full textDivision of Endodontics
Dept. of Restorative Dental Science
College of Dentistry, King Saud University, Riyadh, KSAThe purpose of this laboratory exercise was to describe the fabrication of an in vitro model, containing natural teeth, for teaching the principles of conventional endodontic procedures to preclinical dental students. Maxillary and mandibular models were made (from moulds using silicone duplicating material with U-shaped lingual/palatal groove) from acrylic mixed with saw dust. Apices of the selected teeth were covered with beading wax and placed in the corresponding sockets of the rubber mould before pouring the acrylic. Using this model for a period of two-years has proved to be beneficial for undergraduate pre-clinical endodontic course work since its advantages were accepted by both the students and faculty staff
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
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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