1,720,954 research outputs found
Solidi elastici in contatto unilatero con attrito: algoritmi alle tensioni
No full textIl numero di problemi meccanici in cui intervengono fenomeni di contatto è quanto mai esteso nelle applicazioni dell'ingegneria meccanica e civile. E' infatti attraverso il contatto, in genere in presenza di attrito, che vengono trasferiti i carichi di superficie ai corpi oggetto di indagine. In particolare, lo spettro di applicazioni comprende lo stampaggio e la lavorazione dei metalli, cuscinetti, impianti frenanti, componenti di motori e turbine, giunti, nonché l'utilizzo nel campo della biomeccanica per lo studio di protesi, articolazioni e denti.
La presente ricerca riguarda la modellazione matematica del problema di contatto in presenza di attrito attraverso la formulazione in forma variazionale duale avente cioè, a differenza della formulazione primale negli spostamenti, come funzioni incognite da determinare le tensioni normale e tangenziale sulla superficie di contatto. E' stato sviluppato l'algoritmo chiamato D-PANA per risolvere i problemi di contatto e di attrito a blocchi e ne è stata provata la
convergenza al finito ad un'unica soluzione. L'algoritmo è stato implementato in simulazioni di problemi in due e tre dimensioni, i cui risultati sono stati
confrontati con successo con quelli ottenuti per via esatta o in formulazione primale
ATENEA4SME: A Tool for Self-Evaluation of Energy Efficiency and Audit Support In Industrial SME
No full textThe limited diffusion and the lack of effective tools for carrying out energy audits in small and medium-sized enterprises (SMEs) are significant barriers to promote energy efficiency in the Italian production sector, which includes industry, tertiary sector and transportation. ATENEA4SME (Advanced Tool for Energy Audit for SMEs) is designed to assist SMEs in the self-evaluation of energy consumption, to support energy audit in SME and to identify and foster energy-efficiency investments. The tool is characterized by automatic procedures differentiated by NACE nomenclature and elaborates suggestions for energy efficiency investments by means of a mathematical model in which multi-criteria analysis and a questionnaire are considered. This article will provide a detailed description of the tool, highlighting and describing the Sections and the steps to obtain the final overview of the energy consumption of the enterprise under investigation and the opportunities of energy saving. The tool contributes to remove barriers to the development of energy-efficiency measures, both from a technical and economic point of view. In the paper, some application cases, focused on a comprehensive analysis of energy efficiency investments, have been included
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
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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