1,720,970 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
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
The effects of lysergic acid diethylamide (LSD-25) on the physiology and morphology of rabbit sperm maintained in vitro, 1970
Get PDFThe present study was undertaken to explore some of the physiological and morphological effects of LSD-25 on rabbit spermatozoa. Rabbit spermatozoa were collected with the aid of an artificial vagina and maintained n vitro in NJ-3 solution and in LSD-25 solution. Rabbit spermatozoa exposed to LSD-25 were more motile at zero time and also maintained a higher motility rating after 24 hr than cells maintained in HJ-3 solution. These same cells also lived longer than spermatozoa exposed to NJ-3 solution. Glucose uptake by rabbit sperm cells treat ed with LSD-25 showed an initial increase in oxygen utiliza tion only to decline to zero after 24 hr. Electron micrographs obtained from this study illus trated loosening or blebbing of the acrosomal and plasma membranes of unincubated rabbit spermatozoa. The membrane effects seen here resemble the effects seen by Bedford (1964) in rabbit spermatozoa recovered from the uterus. The plasma membranes of spermatozoa incubated in LSD-25 were completely detached from the acrosomal membrane. The plasma membrane adheres only at the anterior end of the acrosomal membrane of the sperm head in normal spermatozoa. The midpieces of dead spermatozoa incubated in LSD-25 and unincubated spermatozoa were enlarged at 24 hr. Electron micrographs of spermatozoa incubated in MJ-3 solution did not show enlarged midpieces. Electron micrographs of heads of rabbit spermatozoa treated with LSD-25 showed signs of regular bands of low and high electron dense materials. This characteristic was not observed in rabbit spermatozoa incubated in HJ-3 solution or in fresh unincubated spermato zoa. Heterogeneous distribution of materials in the heads of rabbit sperm cells exposed to LSD-25 has not been reported before
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
The effects of nitrate and chloride ions on rabbit sperm physiology, 1969
No full textThis study was undertaken to determine the effects of Norman-Johnson II (Cl) and III (N03) diluents on physiologic activities of New Zealand white rabbit spe~tozoa as indicated by changes in motility, oxygen and carbohydrate uptake, lactic acid production and incidence of death. Semen was obtained by using a teaser doe and an artificial vagina. Samples were pooled, divided equally, and were washed in N-J diluents. OXygen uptake was determined by the direct method of Warburg. Glucostat reagent was used for the enzymatic determination of glucose concentrations. Lactate levels were determined following a modification of the procedures for the assay of lactic acid dehydrogenase as outlined by Nachlas, et al. (1960), and for lactic acid by Friedland and Dietrich (1961). Motility was evaluated on the basis of percent motile sperm and the quality of movement displayed by these cells. Percent live-dead cells was dete~ined by differential staining technique utilizing the nigrosineosin stain. Sperm concentrations were determined hemocytometrically. Results indicated that oxygen uptake of cells in N-J III diluent was 65% greater than that of sperm in the N-J II diluent. Glucose utilization was 78% greater in the nitrate diluent than in chloride. Differences in both 02 and glucose utilization were significant (P<0.05). No differences in motility or percent live-dead ratio of incubated sperm were detected. No significant difference in lactate production was observed. Johnson (1966) reported that only 40% of the glucose uptake by bovine and porcine sperm in N-J diluents could be accounted for in terms of oxygen uptake and lactic acid production; 97-100% of the glucose taken up by rabbit sperm in this study could be accounted for in terms of oxygen uptake in both N-J diluents. It appears that rabbit sperm use, almost exclusively, an aerobic metaboliC pathway. This work demonstrated that inorganic ions exert definite influences on the physiologic activity of rabbit spermatozoa
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