1,720,962 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
Production 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
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
Production of polycaprolactone foams incorporating Hibiscus sabdariffa extract
Full text linkHibiscus sabdariffa is a plant characterized by a high content of antioxidant molecules; its aqueous extract (karkadé) 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 karkadé inhibition power, by entrapping it in poly-ε-caprolactone (PCL) foams. Karkadé was obtained using Rapid Solid-Liquid Dynamic Extraction, processed at 20 °C and below 10 bar. The concentration of karkadé 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 karkadé extracted using other techniques (>60 %). Entrapment of karkadé occurred during the preparation of 3 mg/mL PCL in an acetone solution, which solidified upon solvent evaporation at 20 °C, obtaining a disk. Then, the disk was foamed using CO2 as physical blowing agent at optimized parameters (45 °C, 100 bar, and sorption for 60 min). Foam density of 180 kg/m3, cell number density of 4.1E06 cell/cm3, and an average pore dimension of 56 ± 28 μm were obtained, with karkadé entrapment efficiency up to 97 %. This study focused on manipulating PCL foam cells density and diameter, to influence release time of karkadé 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
Various Applications of Processing of Olive Leaves Waste Extracted with RSLDE: A Green Technology
No full textThere is no waste in nature. Everything that is produced has a purpose and everything that becomes waste can be transformed into a new resource, triggering a virtuous circuit that feeds itself. The circular economy of waste means a system in which the production-consumption-disposal process is overcome to replace it with a circular model, where the final waste product is re-introduced into the circulation as a secondary raw material. The logic to follow is that after consumption and before any disposal, it is necessary to activate virtuous processes such as reduce, reuse, and recycling. This work focuses on the possible uses of a vegetable waste matrix, such as olive leaves. The olive tree (Olea europaea) is a fruit tree, cultivated for more than 3500 years for its fruits and edible oil. However, just like oil, olive leaf contains a high amount of polyphenols, in particular oleuropein, one of the most powerful natural antioxidants known and hydroxytyrosol, which also has powerful antiseptic properties. Therefore, olive leaf extracts, thanks to the presence of oleuropein associated with hydroxytyrosol, represent a powerful natural antioxidant, a valid ally of the cardiovascular system. In addition, olive leaves are an excellent regulator of the digestive system: they regulate intestinal transit and above all eliminate fungi and other unwanted parasites from the body. Starting from these premises, in this work, a green extraction technique such as rapid solid liquid dynamic extraction (RSLDE) is compared with conventional maceration to obtain an olive leaf extract rich in antioxidants to be used in various sectors
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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