1,721,148 research outputs found
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
A Tribute to S. Deser: Conserved Quantities in Generic Gravity Theories
Get PDFI describe parts of my joint work with S. Deser [March 19, 1931 - April 21,
2023] which started when I was working as a post-doc at Brandeis University in
2001. Our work was mostly, but not exclusively, on conserved charges of higher
curvature theories of gravity. I also describe some recent developments, such
as expressing the conserved charges in terms of the linearized Riemann tensor;
I expound upon the computations. I also reminisce about our interaction for
over two decades that went beyond our scientific collaboration. The physics
part of this review is intended for graduate students and researchers
interested in extended theories of gravity, especially about the conserved
quantities and perturbative techniques in these theories.Comment: 1 figure, 38 pages, includes a brief reminiscence of the author about
S.Deser, a reference added in v
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
Yer çekimsel dalgalar ve yerçekimsel hafıza.
No full textWe study the gravitational waves produced by compact binary systems in the linear regime of massless general relativity and calculate the gravitational memory produced by these waves on a detector.M.S. - Master of Scienc
Adiyabatik Modların ve Süper Yüklerin Soft Teoremler ve Asimptotik Düz Uzayzaman Simetrileri Kullanılarak İncelenmesi
No full textThis thesis aims to investigate and review the connection between adiabatic modes, Ward identities and Weinberg’s soft theorem in the context of asymptotic symmetries and the Bondi-Metzner-Sachs group. Adiabatic modes are low-energy excitations related to the spontaneous breaking of continuous symmetries, while Ward identities are constraints on physical quantities arising from the existence of certain symmetries. Weinberg’s soft theorem, on the other hand, relates the behaviour of low-energy particles in the presence of spontaneously broken symmetries to the symmetries themselves. The main focus will be the examination of how Weinberg’s soft theorem can be produced by the use of the symmetries of the Bondi-Metzner-Sachs group, including the supertranslations and superrotations, to gain insights into the behaviour of low-energy particles in gravity.Bu tezin hedefi asimptotik simetriler ve Bondi-Metzner-Sachs grubu bağlamında adiyabatik modlar, Ward Özdeşlikleri ve Weinberg’in soft teoremi arasındaki ilişkiyi incelemektir. Adiyabatik modlar kendiliğinden simetri kırılması ile ilişkili düşük enerji uyarılmaları iken, Ward Özdeşlikleri bazı simetrilerin varlığından dolayı oluşan fiziksel büyüklüklerin üzerindeki kısıtlamalardır. Öte yandan, Weinberg’in soft teoremi, kendiliğinden simetri kırılmasının varlığındaki düşük enerjili parçacıkların davranışlarını simetrilerin kendileriyle ilişkilendirir. Kütleçekimdeki düşük enerjili parçacıkların davranışları üzerine bir yaklaşım elde edebilmek için tezin odak noktası süperötelemeleri ve süperdönmeleri içeren Bondi-Metzner-Sachs grubunun simetrilerini kullanarak Weinberg’in soft teoremini türetmek olacaktır.M.S. - Master of Scienc
Alan kuramında konformal simetri.
No full textIn this thesis, conformal transformations in d and two dimensions and the results of conformal symmetry in classical and quantum field theories are reviewed. After investigating the conformal group and its algebra, various aspects of conformal invariance in field theories, like conserved charges, correlation functions and the Ward identities are discussed. The central charge and the Virasoro algebra are briefly touched upon.M.S. - Master of Scienc
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