1,720,958 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
Improved mental representation of space in beginner orienteers.
Get PDFThe purpose of the present study was to monitor any improvement
in orienteering skills attributable to acquiring a better mental representation
of space. Two groups were examined: the experimental group, who attended 6 mo.
of orienteering lessons, versus the control group, who did jogging training instead.
Each group, consisting of 20 children, was tested on the Corsi Block-tapping Test,
run Forward and Backward, and the Star-Butterfly Test. Pre- and post-tests were
administered. In the experimental group, scores increased in mean complexity
from pre- to post-test on the Forward and the Backward Corsi tests, while on the
Star-Butterfly Test both time and mistakes had decreased after the training. In the
control group, mean complexity and Star-Butterfly Test scores were unchanged
from pre- to post-test. These results showed that after continual training in orienteering
techniques, the orienteering group was able to remember and repeat sequences
of events with greater precision than before the training, while these skills
were unchanged in the control group after training in jogging
MITOCHONDRIA AND REACTIVE OXYGEN SPECIES IN PREBUPERTAL LAMB OOCYTES BEFORE AND AFTER IN VITRO MATURATION
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Assessment of different functional parameters of frozen-thawed buffalo spermatozoa by using cytofluorimetric determinations
No full textFlow cytometry is a useful tool that provides an accurate, objective and rapid evaluation of semen quality. The use of this technique could significantly improve the quality of buffalo semen samples used in artificial insemination. This study was carried out to evaluate, by flow cytometry, frozen-thawed buffalo spermatozoa quality parameters such as: sperm viability by SYBR-14/propidium iodide staining; mitochondrial function by JC-1 potentiometric probe; sperm chromatin stability (SCSA) by acridine orange and acrosome reaction by FITC-PNA staining. Semen samples from 5 Italian Mediterranean buffalo bulls were used. Sperm viability was not different between bulls and ranged from 33.4 to 43.6%. A consistent rate (55.1±10.8%) of sperm cells showed high mitochondrial membrane potential (Δψhigh), with no significant differences between subjects. SCSA differed significantly between the 5 buffalo bulls, moreover data showed high stability within each buffalo. DNA fragmentation indexes (DFI), such as %-DFI, -DFI, SD-DFI, were 11.2±8.6, 153.3±24.6 and 81.6±21.2, respectively. Regarding acrosome reaction (AR), the percentage of acrosome-reacted live (ARL) and acrosome-reacted dead (ARD) spermatozoa was 0.3±0.2 and 15.3±5.5 respectively. This functional parameter differed significantly between buffalo bulls and showed high stability. Following to Ca2+ ionophore A23187 for 3 hrs, AR significantly differed between subjects and was characterized by an increase of both ARL (10.8%) and ARD population (22.0%). The present study indicates that flow cytometry could be a useful tool for a quick multiparametric evaluation of sperm quality in buffalo. In particular, SCSA and AR resulted sperm functional parameters sensitive enough for the diagnosis of frozen-thawed semen fertilizing potential
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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