1,720,988 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
Ethanol ablation of hepatocellular carcinoma Up to 5.0 cm by using a multipronged injection needle with high-dose strategy
No full textPURPOSE: To investigate whether ethanol ablation by using a multipronged needle delivery system (multipronged ethanol ablation) could eradicate hepatocellular carcinoma (HCC) up to 5.0 cm in diameter with a single-session high-dose strategy.
MATERIALS AND METHODS: The hospital ethics committee approved the prospective study, and each patient provided written informed consent. One hundred forty-one patients (125 men, 16 women; mean age, 53 years; range, 27-76 years) with 164 primary or recurrent HCC ranging from 1.3 to 5.0 cm in diameter (mean, 2.9 cm +/- 0.9) were treated with high-dose multipronged ethanol ablation. Patients were unsuitable for surgery, declined surgery and radiofrequency ablation, or had tumors located at unfavorable sites. Primary technique effectiveness (PTE) (complete ablation within two sessions), local tumor progression (LTP), and complications after the treatment were observed. Twenty risk factors of local effectiveness and complications were analyzed by means of univariate and multivariate analysis.
RESULTS: Mean number of treatment sessions was 1.1. The mean volume of ethanol per tumor was 31 mL (range, 8-68 mL). PTE was achieved in 134 (95%) of 141 patients and was significantly associated with tumor pattern (capsulated vs noncapsulated, P = .018). After a mean follow-up period of 25 months, LTP was observed in 16 (12%) of 134 patients, and in nine (56%) patients, LTP occurred in tumors 3.1-5.0 cm in diameter. Alanine aminotransferase level (P = .023) was the independent risk factor for LTP. Three (2%) of 141 patients had major complications.
CONCLUSION: Multipronged ethanol ablation with a high-dose strategy can be used to treat HCC up to 5.0 cm in diameter effectively and safely, often in a single sessio
湖北丹江口水库主要离子化学季节变化及离子来源分析
No full textWater temperature, pH, EC, TDS, ORP, Si and major anions (Cl-, NO32 and SO42-) and major cations (Na+, K+, Ca2+ and Mg2+) in the Danjiangkou Reservoir, the water source area of the Middle Route of the South to North Water Transfer Project of China were monitored during the period of 2004-2006. Analysis of variance (ANOVA) and principal component analysis (PCA) were performed to explore their seasonal variations and origins. The results show that the water is slightly alkaline with an average pH ranging from 7.9 to 8.4. The water is HCO3--Ca type with low mineralized degree, and its total dissolved solid ranges from 174.6-209.1 mg·L-1. The major ions range are as follows: Cl-, from (4.0±0.5) mg·L-1 to (6.9± 1.8) mg·L-1; NO3-, from (4.6 ± 0.9) mg·L-1 to (6.8±1.7) mg·L-1; SO42-, from (24.3±2.7) mg·L-1 to (35.4±6.9) mg·L-1; HCO3-, from (133.0±11.7) mg·L-1 to (153.5±29.6) mg·L-1; Na+, from (2.0±0.3) mg·L-1 to (5.3±1.0) mg·L-1; K+, from (0.7±0.09) mg·L-1 to (1.6±0.7) mg·L-1; Ca2+, from (33.0±2.1) mg·L-1 to (46.6±0.8) mg·L-1; Mg2+, from (8.0±2.5) mg·L-1 to (10.5±3.2) mg·L-1. Statistical analyses indicate that the water quality variables display significant seasonal differences except HCO3 and Si. In general, major ion concentrations in flood season are relatively lower due to the dilution of precipitation. HCO3- accounts for 75%-88% of the total major anions, while Ca2+ and alkali-earth metals (Ca2++Mg 2+) account for 60%-80% and 87%-96% of the total major cations respectively, reflecting that carbonic acid weathering is the main proton producer in the water. The major ions have no adverse effects on human according to water drinking quality guidelines of China and WHO.No Full Tex
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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