1,720,954 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
Nanocarbon Containing Alumina-carbon Refractories
No full textThe functional refractories used in steel casting operations are usually made up of alumina- carbon based compositions due to their comprehensive properties. Conventionally, these refractories contain 25-30 wt% carbon, with graphite as the main carbon source, particularly to impart and improve corrosion and thermal shock resistance. The presence of alumina provides excellent mechanical and thermomechanical properties along with other conventional refractory properties. Owing to its low thermal expansion and superior thermal conductivity, carbon addition provides excellent thermal shock resistance. Because of its non-wetting nature, it avoids the adhesion of steel/slag melts on the refractory thereby improving corrosion resistance. As carbon imparts these two extremely important properties in the refractory compositions, the amount of graphite usage is considerably high for these refractories compared to other carbon-containing ones. However, the presence of high carbon encompasses several problems viz. a) higher heat loss due to the increased thermal conductivity of the refractory which increases the specific energy consumption per unit of steel production b) enhances the chances of carbon pick-up by steel, which affects the quality and properties of steel negatively c) oxidation of carbon causing a porous refractory structure which can be easily penetrated and corroded by steel/slag melts d) releases a higher amount of COx gases into the atmosphere. Considering these factors carbon content in the Al2O3-C refractories is to be reduced. However, minimizing the carbon content reduces the non-wetting behavior and also decreases the thermal conductivity of the refractory which causes an increase in thermal stress within the system, which damages their comprehensive properties and results in poor service life. Hence, the development of low-carbon Al2O3-C refractories without conceding any beneficial properties is a challenge to refractory technologists. Such a challenge is intended in the present work with the use of nanocarbon as a carbon source to reduce/replace graphite. Literature shows different studies are available to develop low carbon-containing Al2O3-C refractories using various carbon sources, replacing graphite partially or entirely, and further evaluation of the properties developed. But hardly any study is available on making low carbon Al2O3-C refractories with systematic optimization of nanocarbon and graphite content in the composition. Also, the comparison of developed properties of experimental compositions against conventional composition is done in the current work which is rarely found. In the present work, the variation in physical, mechanical, and thermo-mechanical properties with variation in the amount of nanocarbon in the composition is studied. Phase analysis and microstructural developments are also evaluated along with the oxidation resistance at different temperatures. Thermal shock resistance and corrosion resistance are also examined for optimized and selected batches. Nanocarbon possesses greater reactivity due to its high surface area in comparison to graphite and helps in the formation of in-situ ceramic phases like carbides. Formation of aluminum carbide in nanocarbon-containing compositions enhances strength. It can easily disperse in the gaps between coarse, medium, and fine alumina particles thereby reduces porosity and contributing to strength development. Well dispersed nanocarbon results in comparable corrosion properties even at much lower amounts than graphite. These nanocarbon particles can absorb and relieve stresses caused during thermal cycling, thereby improving thermal shock resistance
Study on the Alumina - Silicon Carbide - Carbon Based Trough Castable
Get PDFTechnological advancements in the iron and steel industries have changed significantly the operating practices of the blast furnace and to meet the challenges refractories are also getting changed and upgraded. Trough of blast furnace is important for transferring hot metal from blast furnace to transport vessel and the refractory lining of trough is subject to slag corrosion, oxidation, FeO corrosion from metal, abrasion and thermal / mechanical spalling etc. Trough refractories have changed from conventional hydrous clay‐based material to anhydrous mass to SiC containing material, to Al2O3–SiC based low‐cement castables. However, the presence of lime (cement) affects the high temperature properties and the performance of the refractory lining.
In the present work, Al2O3–SiC‐C based trough castable has been studied with both cement and sol bonding. Different particle size distribution of the castable was also studied. The study compares the various refractory properties of Al2O3–SiC‐C based trough castables, having different bonding system and flow behavior but with similar compositions. Also the effect of addition of spinel aggregates in the compositions with different bonding system was studied.
This comparative study showed improved dried strength for the cement containing compositions. Increasing amount of non‐oxide components (like graphite or SiC) resulted in reduced densification and strength properties for both the bonding system at all the processing temperatures. Increasing amount of spinel in the composition was found to improve the corrosion resistance and sol bonding was found to provide better corrosion resistances than cement bonding against blast furnace slag
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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