1,721,423 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
Penetapan Fosfor Tersedia pada Sampel Tanah Menggunakan Metode Olsen & Bray I
No full textQuantitative analysis was conducted on seven soil samples to determine available phosphorus (P), an essential macronutrient for plant growth and development. This study aimed to compare the effectiveness of two extraction methods, Olsen and Bray I, in measuring phosphorus availability in soils with different chemical characteristics, as well as to provide an overview of soil fertility levels based on the obtained results. The available P content was measured using the Olsen & Bray I methods with a single-beam UV-Visible spectrophotometer. Four soil samples (TH.2278, TH.2279, TH.2280, and TH.2281) were analyzed using the Olsen method, while three samples (TH.2267, TH.2268, and TH.2269) were analyzed using the Bray I method. Based on the Olsen method, samples TH.2278 and TH.2279 contained 34.8270 ppm and 50.5795 ppm P₂O₅, respectively, both classified as very high. In contrast, sample TH.2280 showed a concentration of 3.9325 ppm (very low category), and sample TH.2281 had 8.9920 ppm (low category). Using the Bray I method, sample TH.2267 contained 39.9138 ppm P₂O₅ (very high category), while TH.2268 and TH.2269 contained 1.7534 ppm and 5.3627 ppm, categorized as very low and low, respectively. Overall, three samples (TH.2278, TH.2279, and TH.2267) exhibited very high levels of available phosphorus, while samples TH.2280, TH.2281, TH.2268, and TH.2269 fell within the low to very low categories. These findings indicate that phosphorus availability is strongly influenced by soil chemical conditions, with the Olsen method being more suitable for neutral to alkaline soils and the Bray I method being more responsive to acidic soils. For soils with very high phosphorus levels, phosphate fertilization should be temporarily discontinued to prevent nutrient imbalance and environmental risks. Conversely, soils with low phosphorus levels require regular monitoring and periodic phosphate fertilization to maintain adequate soil fertility.Analisis kuantitatif dilakukan pada tujuh sampel tanah untuk menentukan fosfor (P) tersedia, yaitu unsur hara makro yang penting bagi pertumbuhan dan perkembangan tanaman. Kadar P tersedia diukur menggunakan metode Olsen dan Bray I dengan spektrofotometer UV-Visible single-beam. Empat sampel tanah (TH.2278, TH.2279, TH.2280, dan TH.2281) dianalisis menggunakan metode Olsen, sedangkan tiga sampel (TH.2267, TH.2268, dan TH.2269) dianalisis menggunakan metode Bray I. Berdasarkan metode Olsen, sampel TH.2278 mengandung 34,8270 ppm P₂O₅ dan TH.2279 mengandung 50,5795 ppm, keduanya termasuk kategori sangat tinggi. Sebaliknya, sampel TH.2280 memiliki konsentrasi 3,9325 ppm (kategori sangat rendah), dan sampel TH.2281 mengandung 8,9920 ppm (kategori rendah). Menggunakan metode Bray I, sampel TH.2267 memiliki kandungan P₂O₅ sebesar 39,9138 ppm (kategori sangat tinggi), sedangkan TH.2268 dan TH.2269 masing-masing mengandung 1,7534 ppm dan 5,3627 ppm, yang termasuk kategori sangat rendah dan rendah. Secara keseluruhan, tiga sampel (TH.2278, TH.2279, dan TH.2267) menunjukkan kadar fosfor tersedia yang sangat tinggi, sedangkan sampel TH.2280, TH.2281, TH.2268, dan TH.2269 berada dalam kategori rendah hingga sangat rendah
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
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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