1,720,999 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
Jumping performance of different roles volleyball players in the side out phase
No full textJumping performance of different roles volleyball players in the side out phase
Introduction
The aim of this study is to compare the physical effort of volleyball players of opposite positional role, focusing the analysis to the side out phase of the game, i.e. that phase in which the team starts the rally receiving. Number of jumps executed in a game have been considered as physical performance index, according to Fontani1. Given that opposite-role players have similar technical characteristics, as described by Palao2, it is hypothesized that they would perform a similar number of jumps in a game.
Methods
Statistical data relative to 3 volleyball games (15 sets) of a top level male team employing the 5-1 playing system were collected with the Data Video System (Dataproject s.r.l., Bologna, Italy), and used for the analysis. Jumps performed in the side out phase (K1) were divided in blocking and spiking jumps. The mean jump number for game was analysed with Chi-square tests (=0.05), comparing respectively the setter (P) vs. the opposite (O), the two hitters (S1 - S2) and the two middle blockers (C1 - C2).
Results
Table 1: Comparison between role and position in the side out phase
Position Total Jumps (K1+ K2) K1 BLOCK K1 SPIKE
Mean ± S.D. K1% Mean ± S.D.. % Mean ± S.D. %
C1 112.7±2.9 46.6 12.0±2.6 23.4 39.3±3.2 76.6
C2 105.7±21.4 43.7 12.0±1.0 26.1 34.0±6.9 73.9
S1 93.0±22.0 40.6 8.0±4.0 21.2 29.7±13.3 78.8
S2 76.3±24.6 31.9 5.7±3.1 23.3 18.7±9.1 76.7
P 141.3±10.0 63.2 9.0±1.0 10.1 2.0±1.0 1.1
O 109.0±47.9 44.6 8.0±2.6 20.7 30.7±8.1 79.3
Table 1 displays the mean ± SD jump number for game for each of the considered roles in the side out phase. Jumps performed in the entire game (including the defensive phase, K2) are also reported for comparison purposes. No significant difference was shown between the considered couples of roles for blocking and spiking jumps. Besides the actions reported in the table, 79.3±8.1 additional jumps to set were performed by the setter. This was the only role involved in setting in the side out phase.
Discussion/Conclusion
Number of jumps referred to the entire game is similar to previous studies (Palao1, Fontani2). The new contribution of this study is a focused investigation of the K1 phase, revealing as expected no differences between opposite-role players. In the K1 phase, it is emphasized the exceptional physical effort of the setter, since he has to set as often as possible to accelerate the play.
References
1. Fontani, G., Ciccarone, G. et al. (2000) SDS-Rivista di cultura sportiva. 50:14-20.
2. Palao, J.M., Santos, J.A. et al. (2006) Journal Human Movement Science 51:221-228
Non-conventional Stabilization for Fruit and Vegetable Juices: Overview, Technological Constraints, and Energy Cost Comparison
Full text linkThis study will provide an overview and a description of the most promising alternatives to conventional thermal treatments for juice stabilization, as well as a review of the literature data on fruit and vegetable juice processing in terms of three key parameters in juice production, which are microbial reduction, enzyme inactivation, and nutrient-compound retention. The alternatives taken into consideration in this work can be divided, according to the action mechanism upon which these are based, in non-conventional thermal treatments, among which microwave heating (MWH) and ohmic heating (OH), and non-thermal treatments, among which electrical treatments, i.e., pulsed electric fields (PEF), high-pressure processing (HPP), radiation treatments such as ultraviolet light (UVL) and high-intensity pulsed light (PL), and sonication (HIUS) treatment, and inert-gas treatments, i.e., the pressure change technology (PCT) and supercritical carbon dioxide (SC-CO2) treatments. For each technology, a list of the main critical process parameters (CPP), advantages (PROS), and disadvantages (CONS) will be provided. In addition, for the non-thermal technologies, a summary of the most relevant published result of their application on fruit and vegetable juices will be presented. On top of that, a comparison of typical specific working energy costs for the main effective and considered technologies will be reported in terms of KJ per kilograms of processed product
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
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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