1,721,486 research outputs found
Response to letter to the editor regarding “The effects of transcranial magnetic stimulation in motor symptoms of Parkinson’s disease: an overview of systematic reviews with meta-analysis”
No full textTwo Families of W-Methods: Analysis and Application on Battery Models
No full textThis paper focuses on the efficient numerical solution of stiff initial value problems arising from the spatial discretization of Partial Differential Equations (PDEs). In particular, this work shows an efficient implementation of two families of linearly implicit numerical methods recently introduced in the scientific literature: the TASE-W methods and the singly TASE-Runge-Kutta methods. These methods are derived exploiting the so-called TASE (Time-Accurate and highly Stable Explicit) operators, and are particular cases of W-methods. We deeply analyze the properties of consistency, stability, and computational cost of TASE-W and singly TASE-Runge-Kutta methods, employing them for the solution of a system of two coupled PDEs for the description of the charge/discharge processes in electric batteries
Panegirici del conte D. Emmanvel Tesavro, caualier Gran Croce, de' SS. Mauritio, e Lazaro : parte prima ...
No full textTít. en antep.: "Panegirici del Conte D. Emanvel Tesavro : diuisi in tre parti"Sign.: A-R\p12\sPort. enmarcada con grav. xi
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
A MATLAB code for the computational solution of a phase field model for pitting corrosion
No full textPhase field models have been widely considered to simulate corrosion dynamics characterised by moving boundaries. The benefits of using these models rely on the fact that the moving interface is implicitly treated by means of the introduction of an auxiliary variable. However, the computational cost of these methods is typically very high. In this paper we consider a model for pitting corrosion of a metallic specimen immersed in an electrolytic solution. For its numerical solution we consider a method that relies on a suitable splitting of the governing equations and on the use of exponential integrators. The use of modern MATLAB functions to evaluate the effect of matrix exponentials on a vector is crucial for the efficient implementation of the method. The software used is presented and discussed in detail, and some numerical tests are introduced to show the performance of the proposed algorithms
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
On the Advantages of Nonstandard Finite Difference Discretizations for Differential Problems
No full textThe goal of this work is to highlight the advantages of using NonStandard Finite Difference (NSFD) numerical schemes for the solution of ordinary differential equations (ODEs) and Partial Differential Equations (PDEs) of which some properties of the exact solution, such as positivity, are a priori known. The main reference considered is Mickens' work [14], in which the author derives NSFD schemes for ODEs and PDEs that describe real phenomena and, therefore, widely used in applications. We rigorously demonstrate that NSFD methods can have a higher order of convergence than the related classical ones, deriving also conditions that guarantee the stability of the analyzed schemes. Furthermore, we carry out in-depth numerical tests comparing classical methods with the NSFD ones proposed by Mickens, evaluating when the latter are decidedly advantageous
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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