1,720,995 research outputs found
Baj nel bel mondo allegro
No full textAnalisi critica dei recenti testi teorici e comparazione delle relative serie pittoriche e scultoree di Baj, in chiave di critica social
Free vibrations of ultrathin deployable booms fabricated with nano-modified epoxy matrix
No full textUltrathin deployable boom structures are investigated to increase the mission capacity of small spacecrafts within their limited package volume. The successful integration of boom technology would allow small satellites to perform missions that are commonly reserved for larger and more complex space platforms. The boom is directly exposed to the space environments, which produces detrimental effects of the overall properties of the composite structure. On the other hand, the dynamic characterization of boom structures during the deployment phase and in deployed configuration is of primary importance to understand the factors that influence the operative behavior of the entire satellite. Polymer-based composites are a class of materials that have gained more attention for damping applications. The introduction of nanoparticles to the polymer matrix can add large benefits. Recent studies showed that nanocomposites possess a high potential for damping applications. In addition, certain nanoparticles, such as nanosilica, can enhance the resistance of composite materials to the space environments. In this work, we aim to investigate the effects of nanoparticles on the free vibrations of boom structures. In the first part of this work, we fabricated prototypes of 1 m-long self-deployable ultrathin booms with V cross-section geometry using 1K carbon fiber reinforcement and epoxy resin modified with nanoparticles. In particular, we used nanosilica and graphene oxide at 1 wt% and 2 wt%. The manufacturing process was studied and optimized in order to fabricate reproducible and reliable structures. Then, in order to investigate the effects of the nanoparticles on the vibrational response of the nanocomposite booms, we performed modal testing by impulsive excitation method. Natural frequencies and modal shapes were determined for each nanocomposite boom and compared with those of the equivalent fiber reinforced composite boom with unmodified epoxy resin. Further, natural frequency analysis of the boom structures was performed by finite element method (FEM) in order to deep understand the role of nanoparticles on dynamic behavior. A multiscale approach was used to determine the mechanical properties of nano-modified epoxy matrix and those of the lamina. These data were applied as input for the structural analysis
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
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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