1,721,013 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
Influence of the gaze direction of an observed agent on the visual discharge of grasping mirror neurons in macaque monkey
No full textProduction of polycaprolactone foams incorporating Hibiscus sabdariffa extract
No full textHibiscus sabdariffa is a plant characterized by a high content of antioxidant molecules; its aqueous extract (karkade) offers considerable potential benefits during the healing process. Since most antioxidant molecules are sensitive to thermo-oxidative degradation during extraction and encapsulation processes, this study proposes a novel application to preserve karkade inhibition power, by entrapping it in poly-epsilon-caprolactone (PCL) foams. Karkade was obtained using Rapid Solid-Liquid Dynamic Extraction, processed at 20 degree celsius and below 10 bar. The concentration of karkade solid residue was 195.0 +/- 4.6 g/L, while the reduction of the antioxidant inhibition power was 26.0 +/- 1.4 % after 450 min of extraction, much greater than native karkade extracted using other techniques (>60 %). Entrapment of karkade occurred during the preparation of 3 mg/mL PCL in an acetone solution, which solidified upon solvent evaporation at 20 degree celsius, obtaining a disk. Then, the disk was foamed using CO2 as physical blowing agent at optimized parameters (45 degrees C, 100 bar, and sorption for 60 min). Foam density of 180 kg/m(3), cell number density of 4.1E06 cell/cm(3), and an average pore dimension of 56 +/- 28 mu m were obtained, with karkade entrapment efficiency up to 97 %. This study focused on manipulating PCL foam cells density and diameter, to influence release time of karkade extract into an aqueous receiving medium. Different cells diameters and number density were achieved by varying sorption time of CO2 in PCL, set at 30, 60, and 90 min, respectively. Sorption time of 60 min was demonstrated to be sufficient for creating a uniform porous structure, while a 30 min sorption time resulted in a delayed release rate. Foams were soaked in cell culture medium, which was then put in contact with human keratinocytes, thus demonstrating their biocompatibility up to 9 days
Mirror Neurons of Ventral Premotor Cortex Are Modulated by Social Cues Provided by Others' Gaze.
No full textMirror neurons (MNs) in the inferior parietal lobule and ventral premotor cortex (PMv) can code the intentions of other individuals using contextual cues. Gaze direction is an important social cue that can be used for understanding the meaning of actions made by other individuals. Here we addressed the issue of whether PMv MNs are influenced by the gaze direction of another individual. We recorded single-unit activity in macaque PMv while the monkey was observing an experimenter performing a grasping action and orienting his gaze either toward (congruent gaze condition) or away (incongruent gaze condition) from a target object. The results showed that one-half of the recorded MNs were modulated by the gaze direction of the human agent. These gaze-modulated neurons were evenly distributed between those preferring a gaze direction congruent with the direction where the grasping action was performed and the others that preferred an incongruent gaze. Whereas the presence of congruent responses is in line with the usual coupling of hand and gaze in both executed and observed actions, the incongruent responses can be explained by the long exposure of the monkeys to this condition. Our results reveal that the representation of observed actions in PMv is influenced by contextual information not only extracted from physical cues, but also from cues endowed with biological or social value
Anatomo-functional organization of the lateral agranular frontal cortex in the macaque monkey
No full textNeuronal responses during vocalization in the ventral premotor cortex of macaque monkeys
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