1,721,023 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
Ontwerpschema van een chemische fabrieksinstallatie voor de ontzwaveling van dieseloliën
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
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
Toolpath Generation for Fused Filament Fabrication of Functionally Graded Materials
No full textThe products in our day to day lives have different requirements in different regions of the product. One way of dealing with such spatially varying requirements is to divide the product into multiple parts and assign each part a different material. For example, the handle of a drill is often fitted with a rubbery material which gives it more grip when holding it. This gives the designer a choice of which regions exactly to use that material. Designers can consider the large variety of hands and ways of holding a drill. Equipped with an average distribution of gripping pressure throughout the handle, they could identify the regions with a pressure higher than some cutoff value and assign the gripping material to those regions. This means that the material properties vary abruptly over the surface; the adjacent regions on the one side of the cutoff value provide needlessly much grip, while on the other side the regions provide too little grip. The final distribution of material properties is segmented and therefore does not follow the gradual distribution of requirements optimally. In this workflow the designer is forced to reduce the continuous gripping pressure information into a binary material choice. But what if we could manufacture products with a gradient in their material properties? To answer this question we consider the material and the manufacturing technique. A Functionally GradedMaterial (FGM) is any substrate with material properties made to vary from region to region. FGMs find application for example in personalized footwear, implants, tires and airplane wings. They can improve a product’s performance by optimizing the spatial gradation of material properties throughout the product. Rather than a homogeneous block of material, FGMs consist of a fine-scale geometry of one or more base materials. The material properties of an FGM can be governed by controlling the shape of that fine-scale structure. Fused Filament Fabrication (FFF) is an additive manufacturing technique which can produce complex geometry cheaply. Thermoplastic material is heated and extruded out of a nozzle to deposit extrusion lines. These extrusion lines accumulate to formlayers, which are added on top of each other to form the final product. A 3D model is converted into toolpaths for the 3D printer, which describe the geometry of the extrusion lines the nozzle should traverse. Because of the physics involved in suchmachines, there are severalmanufacturing constraints to which the print job must adhere, such as (i) the maximum overhang angle to prevent printing in mid air, (ii) (semi-)continuous extrusion to prevent print defects at the ends of extrusion lines, (iii) integer thickness geometry (N * linewidth) to prevent overlapping extrusion lines, and (iv) chemically compatible materials to prevent a multi-material print job from disassembling during the manufacturing process...Materials and Manufacturin
Verisimilitude and belief change for nomic conjunctive theories
Get PDF<p>In this paper, we address the problem of truth approximation through theory change, asking whether revising our theories by newly acquired data leads us closer to the truth about a given domain. More particularly, we focus on "nomic conjunctive theories", i.e., theories expressed as conjunctions of logically independent statements concerning the physical or, more generally, nomic possibilities and impossibilities of the domain under inquiry. We define both a comparative and a quantitative notion of the verisimilitude of such theories, and identify suitable conditions concerning the (partial) correctness of acquired data, under which revising our theories by data leads us closer to "the nomic truth", construed as the target of scientific inquiry. We conclude by indicating some further developments, generalizations, and open issues arising from our results.</p>
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