1,720,986 research outputs found
A parametric analysis of the effect of the jet initial conditions on the wavelet-decomposed near-field acoustic pressure
No full textTHE EFFECTS OF INNER BOUNDARY LAYER THICKNESS ON THE NEAR PRESSURE FIELD OF A SUBSONIC JET
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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
An extensive near-field noise prediction of a subsonic jet using data-driven surrogate model based on neural networks
No full textThe use of surrogate models has become essential in modern design processes, with machine learning algorithms increasingly adapting to active meta modelling techniques. In this specific investigation, the formulation focuses on Artificial Neural Networks (ANNs) as data-driven nonlinear models. Within this study, ANNs formulation is used as a data–driven nonlinear model aimed at describing the dynamics and the noise emitted by a single-stream subsonic jet, trained with a large numerical database that includes a wide range of parameters. What sets this model apart is its pioneering incorporation of variables such as nozzle exhaust turbulence intensity and nozzle–exhaust boundary–layer thickness. These parameters significantly influence noise emissions and are challenging to model using traditional analytical methods. The training dataset was formulated using 80% of the information sourced from the numerical database derived from large-eddy simulations (LESs) of a jet flow operating at M=0.9 and Re = 105.Pressure time series were gathered from virtual probes placed at various radial and axial positions within the near field. The model has been properly validated and it is shown to predict well the pressure spectra over the entire range of frequencies of interest
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
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