1,720,970 research outputs found
ELASTIC NUCLEON-NUCLEON SCATTERING IN A GAUGE FIELD THEORY
No full textFleischer J, Pindor M. ELASTIC NUCLEON-NUCLEON SCATTERING IN A GAUGE FIELD THEORY. 1989
EVALUATION OF OPERATOR PADE APPROXIMANTS FOR PERTURBATIVE EXPANSIONS IN SCATTERING-THEORY
No full textFleischer J, PINDOR M. EVALUATION OF OPERATOR PADE APPROXIMANTS FOR PERTURBATIVE EXPANSIONS IN SCATTERING-THEORY. PHYSICAL REVIEW D. 1981;24(7):1978-1986
What may be expected from perturbative QCD in four loop order and beyond
No full textFleischer J, Pindor M, Raczka PA, Raczka R. What may be expected from perturbative QCD in four loop order and beyond. 1989
APPROXIMATE FOUR LOOP ANALYSIS OF THE R (e+ e-) RATIO IN QCD
No full textFleischer J, Pindor M, Raczka PA, Raczka R. APPROXIMATE FOUR LOOP ANALYSIS OF THE R (e+ e-) RATIO IN QCD. 1989
SCHWINGER VARIATIONAL PRINCIPLE IN SCATTERING-THEORY
No full textFleischer J, PINDOR M. SCHWINGER VARIATIONAL PRINCIPLE IN SCATTERING-THEORY. ACTA PHYSICA POLONICA B. 1994;25(11):1547-1567.We give a detailed account on the application of the Schwinger variational principle (SchVP) for the evaluation of operator Pade approximates (OPA's). OPA's can be considered in their simplest ''one-loop'' (ladder) form as solutions of scattering equations but allow for a more natural transition to quantum field theory beyond ladder approximation. Therefore methods for their evaluation are of high interest. One of these methods is the SchVP which we study in the special case of elastic nucleon-nucleon scattering in terms of the Blankenbecler-Sugar equation. Since exact proofs of convergence for the SchVP cannot be found in general, the intention of our paper is to give by a detailed study of this complex example a justification for the application of the SchVP in even more complex situations. Applying the SchVP, it is shown that relatively simple and quite precise approximations for the T-matrix elements can be constructed valid for the whole energy range under consideration
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
- …
