1,720,957 research outputs found
Stochastic Growth Models
No full textDurrett, R.; Schonmann, R.. (1987). Stochastic Growth Models. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/4504
Facilitated Oriented Spin Models: Some Non Equilibrium Results
No full textWe perform the rigorous analysis of the relaxation to equilibrium for some facilitated
or kinetically constrained spin models (KCSM) when the initial distribution ! is
different from the reversible one, μ. This setting has been intensively studied in the physics
literature to analyze the slow dynamics which follows a sudden quench from the liquid to the
glass phase. We concentrate on two basic oriented KCSM: the East model on Z, for which
the constraint requires that the East neighbor of the to-be-update vertex is vacant and the AD
model on the binary tree introduced in Aldous and Diaconis (J. Stat. Phys. 107(5–6):945–
975, 2002), for which the constraint requires the two children to be vacant. It is important to
observe that, while the former model is ergodic at any p != 1, the latter displays an ergodicity
breaking transition at pc = 1/2. For the East we prove exponential convergence to equilibrium
with rate depending on the spectral gap if ! is concentrated on any configuration which
does not contain a forever blocked site or if ! is a Bernoulli(p") product measure for any
p" != 1. For the model on the binary tree we prove similar results in the regime p,p" < pc
and under the (plausible) assumption that the spectral gap is positive for p < pc. By constructing
a proper test function, we also prove that if p" > pc and p # pc convergence to
equilibrium cannot occur for all local functions. Finally, in a short appendix, we present a
very simple argument, different from the one given in Aldous and Diaconis (J. Stat. Phys.
107(5–6):945–975, 2002), based on a combination of some combinatorial results together
with “energy barrier” considerations, which yields the sharp upper bound for the spectral
gap of East when p $ 1
On the 2D Stochastic Ising Model in the Phase Coexistence Region Near the Critical Point
No full textWe consider the two-dimensional stochastic Ising model in finite square Lambda with free boundary conditions, at inverse temperature beta > beta(c) and zero external field. Using duality and recent results of Ioffe on the Wulff construction close to the critical temperature, we extend some of the results obtained by Martinelli in the low-temperature regime to any temperature below the critical one. In particular we show that the gap in the spectrum of the generator of the dynamics goes to zero in the thermodynamic limit as an exponential of the side length of Lambda, with a rate constant determined by the surface tension along one of the coordinate axes. We also extend to the same range of temperatures the result due to Shlosman on the equilibrium large deviations of the magnetization with free boundary conditions
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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