1,720,962 research outputs found
Pengaruh Variasi Ekstrak Metanol Kulit Buah Rambutan (Nephelium lappaceum L.) Terhadap Kestabilan Fisik Krim Antioksidan
Get PDFABSTRACT A research on influence methanol extracts concentration of fruit peel rambutan (N. lappaceum L.), concerning physical stability of creams antioxidant had been done. This research aims to obtain an antioxidant cream formulation O/W type from rambutan fruit peel extracts and compares activity of the antioxidant cream with extract from fruit peel rambutan with using free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity. A total of 500 grams of fruit rambutan peel extracted with 80% methanol by maceration method and then extract obtained made antioxidant cream O/W type with the variation of the concentration of extract 1%, 2%, and 3% to the total weight of the cream. Evaluation of physical stability of creams includes organoleptic testing, creaming, viscosity testing and drop size of dispersed phase inversion before and after the storage conditions during the 12-hour accelerated alternately at 5°C and as many as 10 cycles of 35°C. Organoleptic observations show no change in color and odor on the third-cream formula. The research was used a completely randomized design and the data obtained were analyzed statistically distinguished by ansira on the confidence level. Statistical analysis shows that the concentration of rambutan fruit peel extracts give significant effect on the viscosity cream before and after accelerated storage conditions, while the size of the drops dispersed showed no significant effect. In this study, showed that no phase of inversion and creaming from all of cream. Formulation of skin creams with methanol extract of the fruit rambutan 1% cream can be categorized as the most stable, continuing antioxidant activity test showed that the cream with a concentration of extract 12,359 ppm, which inhibits 50% of free radicals
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
Penentuan Nilai SPF (Sun Protecting Factor) Ekstrak N-Heksan Etanol Dari Rice Bran (Oryza Sativa) Secara In Vitro Dengan Metode Spektrofotometri UV-VIS
Get PDFSinar matahari merupakan sumber energy bagi kelangsungan hidup semua makhluk di bumi, namun pada paparan berlebih di kulit akan memberikan derajat kerusakan yang tergantung pada frekuensi dan lamanya sinar matahari mengenai kulit. Kemampuan menahan sinar ultraviolet dari sediaan tabir surya dinilai sebagai factor proteksi sinar (Sun Protecting Factor/SPF). Penelitian ini bertujuan untuk menentukan SPF (Sun Protection Factor) dari ekstrak n-Heksan etanol bekatul (Oryza sativa) dengan menggunakan metode spektrofotometri. Bekatul diekstraksi dengan metode soxhlethasi menggunakan larutan penyari n-Heksanetanol, kemudian dibuat seri konsentrasi larutan sampel 100 ppm, 150 ppm, 200 ppm, 250 ppm, dan 300 ppm dengan pelarut etanol absolut. Larutan tersebut selanjutnya diukur absorbansinya pada spektrofotometer UV-Vis dengan panjang gelombang 280-400 nm. Hasil penelitian menunjukkan bahwa ekstrak n-Heksanetanol bekatul dapat efektif memberikan perlindungan pada sinar UV-B. Nilai SPF yang diperoleh mulai dari konsentrasi 200 ppm, dengan nilai SPF sebesar 2,355, selanjutnya pada konsentrasi 250 ppm sebesar2,884 dan pada konsentrasi 300 ppm sebesar 3,483
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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