1,721,233 research outputs found
Running anomalous dimensions in holographic QCD: from the proton to the sexaquark
No full textIn holographic models of QCD, the running of the anomalous dimension of the quark bilinear operator leads to chiral symmetry breaking when gamma=1 and the Breitenlohner-Freedman bound is violated. In that case, the running drives the sigma meson mass tachyonic inducing the chiral symmetry breaking. Here we include the running anomalous dimension in the computation of the spectrum of bound states associated with other operators made of light quarks, such as the nucleon and exotic sexaquark states. We show that including the one loop gauge theory running can have substantial effects on the predictions. For example, the nucleon mass to rho mass ratio is improved and lies much closer to the observed value. A similar result is obtained for the Lambda and Xi baryons when strange quarks are included. A uuddss sexaquark state with a low enough mass to make it stable can be achieved, but this depends on the input assumptions about the running dimension
Arnold's ambivalence and Byron's force and fire
No full text‘I have always sought to stand by myself’ Arnold announced in 1865.1 The remark is the more intriguing for its appearance in the first series of Essays in Criticism, a collection which, with its consideration of cultural tradition and the intricate relationality of writers, both affirms and denies autonomy. A poet-critic deeply interested in the legacy of the past and the influence of previous generations of writers, Arnold was very conscious of the particular challenges of pursuing a literary voice of one’s own in an age when the place and purpose of the arts was being questioned (not least by him), and with the Romantics still in living memory. The irony of Arnold’s wish ‘to stand by myself’ is that its registering of distinctness carries Byronic airs. With one eye on his present fame and one on posterity Byron had declared ‘I stood and stand alone’, sounding more sure of it than Arnold.2 Whether it was his powerful individualism and desire to go his own way, his defence of personal liberties and resistance to authority, or his estranged and egoistic heroes, Byron was the embodiment of self-determination for contemporaries and subsequent generations. Arnold admired Byron’s independent streak, and, ironically, found in it means of self-recognition as well as self-evaluation with which to carve out his own career. He sets up Byron as an example of what he wanted to be, as well as – more negatively – what he was prone to being, what he could not quite manage to live up to, or wanted to avoid becoming. Regard for Byron also enabled him to evaluate the legacy of different strands of English Romanticism and put his finger on what he felt was lacking in Victorian life and culture
Message from the general and paper chairs
No full textThe IEEE Visual Analytics Science and Technology (VAST) Conference continues to develop and grow. Each year brings new researchers to the field and produces important advances in the theory and practice of visual analytics. VAST is now in its seventh year, and it is the third year as an IEEE Conference. The presented work demonstrates significant growth and maturation of the visual analytics community. We received 104 submissions and were able to accept 30 papers into the program. The conference program reflects the breadth of research in the visual analytics community. Paper sessions cover such areas as foundations of the analysis process; tree, network and social network analysis; support for sensemaking and collaborative analysis; visual computational analysis of multivariate data; space and time; and many applications of visual analytics capabilities such as in the biomedical field, risk management, text and document analysis. To select this year's program, an international program committee of 35 experts carefully considered and reviewed the papers through a two-cycle review process instituted this year. Each paper was assigned to a primary and a secondary reviewer from this committee. The primary and secondary reviewers assigned one more tertiary reviewer to each paper so that at least four reviews were provided for all papers. Based on these reviews, the paper chairs selected the papers conditionally first. The primary reviewer had to evaluate the revised papers carefully in the second review cycle. Finally, the paper chairs accepted 30 papers and organized the program sessions. We are grateful to the International Program Committee and the reviewers for their contributions to a successful review process
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
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
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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