1,720,988 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
Karakteristik Eksopolisakarida Mikroalga Porphyridium cruentum yang Berpotensi untuk Produksi Bioetanol
Get PDFPorphyridium cruentum merupakan salah satu mikroalga yang memiliki kandungan polisakarida yang tinggi dan mampu menghasilkan polisakarida ekstraseluler dengan jumlah mencapai 19,7 g/L. Mikroalga tidak mengandung lignin sebagai pelindung dinding selnya, sehinggaberpotensi sebagai bahan produksi bioetanol. Kendala yang dihadapi untuk mendapatkan eksopolisakarida P. cruentum yaitu pada tahap pemanenan, pemisahan eksopolisakarida dari media kultivasi. Tujuan penelitian ini adalah membandingkan metode pemanenan eksopolisakarida P. cruentum dengan bahan presipitasi yang berbeda untuk mendapatkan metode alternatif yang lebih baik, serta menentukan metode hidrolisis terbaik untuk menghasilkan gula tertinggi. Penelitian dilakukan dengan tiga tahap terdiri dari kultivasi mikroalga, pemanenan dan karakterisasi, serta hidrolisis eksopolisakarida. Metode kultur menggunakan perlakuan fotoperiod 12 jam gelap 12 jam terang. Kultur P. Cruentum dipresipitasi dengan etanol 96% perbandingan 1:0,75 (v/v) dan KOH 5% perbandingan 1:1,5 (v/v). Polisakarida dihidrolisis dengan HCl 2 N dan akuades (suhu 100oC, selama 3 jam). Hasil penelitian menunjukkan bahwa kadar air eksopolisakarida presipitasidengan etanol 96% yaitu 12,70%, abu 59,68%, viskositas 76,8 Cp, rendemen 1,4 g/L dan eksopolisakarida hasil presipitasi dengan dan KOH 5% dengan kadar air 5,28%, abu 78,61% viskositas 134,4 cP, rendemen 6,1 g/L. Monosakarida yang terdeteksi adalah fruktosa. Hidrolisis menggunakan HCl 2 N, suhu 100°C selama 3 hari merupakan metode hidrolisis eksopolisakarida terbaik dengan kadar gula total tertinggi yaitu 24,31%
Physico Chemical Characteristic of Kappa Carrageenan Degraded Using Hydrogen Peroxide
Get PDF<p>Abstract<br />Kappa carrageenan is polysaccharide that widely used in food, pharmaceutical, cosmetic, textile and printing industries as coagulate agent, stabilizer and gelling agent. Hydrogen peroxide (H2O2) is strong oxidator to degrade polysaccharide. Hydrogen peroxide has some advantades such as cheap, easy to get and savety environment. Degradation method using hydrogen peroxide is a technology based on establishment radical hydoxile reactive that attack the glycosidic of polysaccharides as a result reducing in molecular weight of polysaccharide. The aims of this study were to analyze the effect of hydrogen peroxide concentration, temperature and degradation time to molecular weight of refined kappa carrageenan. Structural changes on kappa carrageenan degradation were characterized by viscometer, SEM and FTIR. Hydrogen peroxide concentration, temperature and degradation time were significantly reducing molecular weight and changes in the structural function of refined kappa carrageenan. The lowest molecular weight of refined kappa carrageenan degraded was obtained from the treatment 3% of hydrogen peroxide at temperature 80°C and degradation time for 4 hours.<br /><br /></p></jats:p
Purification of Sardine Fish Oil Through Degumming and Neutralization
Get PDFThe quality of sardine fish oil can be improved by purification method through the step of degumming and neutralization. The aimed of this this study was analysis characteristic of crude sardin fish oil and determined the best method of purification. Degumming was carried out using 30% water and salt at concentration 5%, 8%, 10% b/v. Neutralization process using NaOH with 16°Be and bleaching using 5% Magnesol XL. All step of refining was done at 50°C, 60°C, 70°C, and 80°C. The result of analysis showed that sardine crude fish oil had 24.86% of palmitic acid as the highest fatty acid, heavy metal was not detected,<br />dencity was 0.92 g/cm3 and viscocity was 51 cPs. The best treatment of purification method was degumming using 5% NaCl at 50°C with rendement 65.37±0.72%; free fatty acid (FFA) 0.38±0.03%; peroxide (PV) 1.07±0.12 mEq/kg; anisidine (p-AnV) 15.18±0.16 mEq/kg; total oxidation value (TOTOX) 17.31±0.39 mEq/kg; and clarity was 75.09± 1.20%.<br /><br /></jats:p
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