1,720,964 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
On a theorem of Gel’fand and a new proof of the Orlicz-Pettis theorem
No full textIn questa nota si estende al caso di funzioni con valori in F-spazi un teorema di Gel’fand sulle funzioni debolmente continue definite su uno spazio topologico con valori in uno spazio di Banach. Usando questa estensione si dà una nuova dimostrazione del teorema di Orlicz-Pettis in F-spazi con base.In this note a theorem of Gel’fand on the weak continuous functions defined on topological spaces with values in Banach spaces is extended to the case of functions with values in F-spaces. Using this extension we gave a new proof of Orlicz-Pettis theorem in F-spaces with basis
Unconditional convergent series and subalgebras of C_0 (X)
No full textIn questo lavoro si dimostra che una subalgebra di C (X) non
contenente un sottospazio isomorfo allo spazio c di Banach
è di dimensione finita. Si dà inoltre una nuova dimostrazione di certi
risultati di analisi numerica (teoremi di Helson e di Segal).In this paper we prove that subalgebras of C (X) not containing
a subspace isomorphic to the Banach space c is finite dimensional.
Also we give new proofs for certain results in harmonic analysis (Helsons
and Segals theorems)
Note on a theorem of Levitan for the integral of almost periodic functions
No full textViene dimostrato un teorena di B. Levitan nel caso di funzioni ricorrenti.
Si dimostra inoltre che se lo spettro di una funzione astratta limitata
uniformemente continua ha un numero finito di punti limite su ogni
intervallo della retta reale, la funzione è quasi-periodica.In this paper we prove a theorem of B. Levitan in the case of recurrent
functions. We also prove that if the spectrum of uniformly continuous
and bounded function , where is a Banach space,
has only a finite number of limit points on every segment of ,
then is almost periodic function
Unconditionally convergent series and subspaces of D^m (0,1)
No full textIn questo lavoro si dimostra che i sottospazi complementati di D(0,1)
hanno dimensione finita. Si dimostra altresì che le sottoalgebre di
D(0,1) che non contengono sottospazi isomorfi a c sono
di dimensione l o 0.In this paper we prove that complemented subspaces of D(0,1)
are finite dimensional. We also show that subalgebras of D(0,1)
which do not contain isomorphic to c subspaces are of dimension
l or 0
Weakly almost periodic functions in Banach spaces
No full textSi dimostra che se uno spazio di Banach B non è debolmente sequenzialmente completo, esistono funzioni f:R―>B debolmente quasi- periodiche non debolmente relativamente complete. Si dimostra ancora che le ipotesi poste da L. Amerio per due altri teoremi sono necessarie.In this paper we prove that if the Banach space B is not weakly sequentially complete, then there exists a weakly almost-periodic function f:R―>B which is not weakly relatively complete. We also prove the necessity of the conditions of two other theorems of L. Amerio
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
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