1,721,040 research outputs found
Critical behavior of the energy and pressure correlation functions in SU(2) gauge theory
No full textPica C, Hubner K, Karsch F. Critical behavior of the energy and pressure correlation functions in SU(2) gauge theory. PoS. 2008;LATTICE2008:199
The chiral transition in two-flavor QCD
No full textQCD with Nf =2 is a specially interesting system to investigate the chiral transition. The order of the transition has still not been established. We report the results of an in-depth numerical investigation performed with staggered fermions on lattices with Lt=4 and Ls=12,16,20,24,32 and quark masses amq ranging from 0.01335 to 0.307036. Using finite-size techniques we compare the scaling behavior of a number of thermodynamical susceptibilities with the expectations of O(4) and O(2) universality classes. Clear disagreement is observed. Indications of a first order transition are found. Preliminary reports of this work were presented at past Lattice conference
The order of the chiral transition in N_f=2 QCD
Full text linkA strategy is developed to investigate the order of the transition using
finite size scaling and its relation to color confinement. An in-depth
numerical investigation has been performed with KS fermions on lattices with
N_t=4 and N_s=12,16,20,24,32 and quark masses am_q ranging from 0.01335 to
0.35. The specific heat and a number of susceptibilities have been measured and
compared with the expectation of an O(4) second order and a first order phase
transition. A second order O(4) is excluded, whilst data are consistent with a
first order
Chiral transition and deconfinement in QCD
No full textThe study of QCD with two light dynamical fermions is of fundamental
importance to understand the mechanism of color confinement. We present results
of a numerical investigation on the order of the chiral phase transition with
by use of a novel strategy in finite size scaling analysis. We
compare the critical behaviour of the specific heat, of the chiral
susceptibility and of the equation of state with the possible critical
behaviours. A second order transition in the O(4) and O(2) universality classes
are excluded by our data and substantial evidence emerges for a first order
transition. Like in most of previous works we have used the standard staggered
action with : possible scaling violations and the need for further
studies are discussed
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
Order, Disorder and Confinement
No full textStudying the order of the chiral transition for is of fundamental
importance to understand the mechanism of color confinement. We present results
of a numerical investigation on the order of the transition by use of a novel
strategy in finite size scaling analysis. The specific heat and a number of
susceptibilities are compared with the possible critical behaviours. A second
order transition in the O(4) and O(2) universality classes are excluded.
Substantial evidence emerges for a first order transition. Results are in
agreement with those found by studying the scaling properties of a disorder
parameter related to the dual superconductivity mechanism of color confinement
Automatic boundary detection for evaluation of global and regional left ventricular function during dobutamine stress echocardiography.
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