1,720,968 research outputs found
The 2-dimensional nonlinear Schrödinger–Maxwell system
No full textIn this paper we carry on the study of a system recently introduced by the first author as the planar version of the well known electrostatic Schrödinger–Maxwell equations. In the positive potential case, we exhibit situations where the existence of solutions depends on the strength of the coupling, being this one modulated by a parameter. We also present some results in the case of a sign-changing potential.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Dipartimento di Matematica Informatica ed Economia Università degli Studi della Basilicata, Via dell'Ateneo Lucano 10Departamento de Matemática e Computação Universidade Estadual Paulista - UnespDepartamento de Matemática e Computação Universidade Estadual Paulista - UnespFAPESP: 2021/04158-4CNPq: 303788/2018-
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
Sub-supersolution method for a quasilinear elliptic problem involving the 1-laplacian operator and a gradient term
No full textIn this work we study a quasilinear elliptic problem involving the 1-laplacian operator and a gradient term. The problem requires the definition of a suitable sense of solution, which allows us to show the existence of a solution in BV(Ω), having no jump part. Despite the lack of regularity of the solutions, we develop a sub-supersolution approach, together with a thorough analysis of the distributional derivative of the functions in BV(Ω).Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Apoio à Pesquisa do Distrito FederalFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Departamento de Matemática Universidade de Brasilia - UNBDepartamento de Matemática e Computação Universidade Estadual Paulista - UnespDepartamento de Matemática e Computação Universidade Estadual Paulista - UnespFAPESP: 2019/14330-
Degenerate Kirchhoff problems with nonlinear Neumann boundary condition
No full textIn this paper we consider degenerate Kirchhoff-type equations of the form−ϕ(Ξ(u))(A(u)−|u|p−2u)=f(x,u)in Ω,ϕ(Ξ(u))B(u)⋅ν=g(x,u)on ∂Ω, where Ω⊆RN, N≥2, is a bounded domain with Lipschitz boundary ∂Ω, A denotes the double phase operator given byA(u)=div(|∇u|p−2∇u+μ(x)|∇u|q−2∇u) for u∈W1,H(Ω), ν(x) is the outer unit normal of Ω at x∈∂Ω,B(u)=|∇u|p−2∇u+μ(x)|∇u|q−2∇u,Ξ(u)=∫Ω(|∇u|p+|u|pp+μ(x)|∇u|qq)dx, 10 and ζ≥1, and f:Ω×R→R, g:∂Ω×R→R are Carathéodory functions that grow superlinearly and subcritically. We prove the existence of a nodal ground state solution to the problem above, based on variational methods and minimization of the associated energy functional E:W1,H(Ω)→R over the constraint setC={u∈W1,H(Ω):u±≠0,〈E′(u),u+〉=〈E′(u),−u−〉=0}, whereby C differs from the well-known nodal Nehari manifold due to the nonlocal character of the problem.TU Berlin, Open-Access-Mittel – 202
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