1,720,955 research outputs found

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The 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

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    “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

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    We 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

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    We 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

    Author Index

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    Pengaruh Waktu Oksidasi Terhadap Morfologi dan Kekerasan Lapisan Al2O3 Pada Aluminium 2024 Menggunakan Metode Plasma Electrolytic Oxidation

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    Penggunaan logam ringan, seperti paduan aluminium mulai meningkat dalam berbagai bidang, penggunaan aluminium untuk kebutuhan material struktural sendiri secara perlahan aluminium mulai menggantikan baja dalam banyak penggunaan, tetapi karena sifat aluminium yang tidak sekuat baja perlu diberikan perlakuan untuk meningkatkan sifatnya, salah satunya Plasma Electrolytic Oxidation (PEO), PEO merupakan jenis rekayasa permukaan seperti anodising, hanya saja menggunakan tegangan yang lebih besar dan lebih ramah lingkungan. Pada penelitian kali ini dilakukan penelitian pengaruh waktu terhadap morfologi lapisan alumina substrat aluminium 2024 yang dilakukan proses PEO sehingga dapat dianalisa pengaruh waktu terhadap morfologi dan kekerasan dari lapisan substrat aluminium 2024. PEO yang dilakukan dengan variabel waktu 10 menit hingga 40 menit menggunakan tegangan 260V DC, dan di dapat rapat arus sebesar 151 – 303mA/cm2. Pada karakterisasi yang dilakukan dengan menggunakan SEM didapat struktur crater dan struktur nodular dimana struktur crater akan semakin membesar dengan semakin lamanya waktu PEO serta pada hasil EDX dengan semakin lamanya waktu oksidasi didapatkan komposisi aluminium oksida yang semakin tinggi, pada karakterisasi XRD yang dilakukan semakin lamanya waktu oksidasi PEO akan menghasilkan fasa γ–Al2O3 dan mullite. Dengan terbentuknya lapisan alumina menghasilkan kekerasan yang tinggi mencapai 896,2 HV untuk proses PEO dengan waktu oksidasi 40 menit. ========================================================================================================= The usage of light alloys, such as aluminium alloys tend to increase in various sectors, the usage of aluminium for structural material itself gradually replacing steel in many sectors, due to the weakness of aluminium itself there were some treatment to increase its mechanichal and other properties, such as Plasma Electrolytic Oxidation (PEO), PEO is a type of surface engineering similar to anodizing but the voltage employed is much higher and also more environmentally friendly. In this research there was investigated the effect of oxidation time to the morphology and hardness of alumina layer from aluminium 2024 substrate with PEO process, so it could be analyzed the effect of oxidation time to morphology and hardness of alumina layer. The PEO process was varied from 10 minutes until 40 minutes using voltage of 260V DC and current density ranged from to 151 to 303mA/cm2. The SEM characterization resulted in nodular structure and crater-like structure that increasing by the longer time of oxidation time, also EDX shows the composition of aluminium oxide was increasing by the longer time of oxidation time, the XRD characterization resulted in the longer oxidation time of PEO treatment resulted in dominant Al2O3 and mullite phase. With the alumina layer formed will generate high hardness reach up to 896.2 HV for PEO process with 40 minutes oxidation time

    koamabayili/VECTRON-author-checklist: VECTRON author checklist

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    We 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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