139,552 research outputs found
El Tesoro del Itschimbia Quito, Ecuador, (Le Trésor de Itschimbia, Quito, Equateur), Jijón y J. Caamaňo.
No full textVignaud Henry. El Tesoro del Itschimbia Quito, Ecuador, (Le Trésor de Itschimbia, Quito, Equateur), Jijón y J. Caamaňo.. In: Journal de la Société des Américanistes. Tome 10 n°1, 1913. pp. 239-240
Coexistence of ordered and disordered phases in potts models in the continuum
No full textThis is the second of two papers on a continuum version of the Potts model, where particles are points in a(d) , da parts per thousand yen2, with a spin which may take Sa parts per thousand yen3 possible values. Particles with different spins repel each other via a Kac pair potential of range gamma (-1), gamma > 0. In this paper we prove phase transition, namely we prove that if the scaling parameter of the Kac potential is suitably small, given any temperature there is a value of the chemical potential such that at the given temperature and chemical potential there exist S+1 mutually distinct DLR measures
Potts models in the continuum. Uniqueness and exponential decay in the restricted ensembles
No full textIn this paper we study a continuum version of the Potts model, where particles are points in R-d supercript stop, d >= 2, with a spin which may take S >= 3 possible values. Particles with different spins repel each other via a Kac pair potential of range gamma(-1), gamma > 0. In mean field, for any inverse temperature beta there is a value of the chemical potential lambda (beta) at which S+1 distinct phases coexist. We introduce a restricted ensemble for each mean field pure phase which is defined so that the empirical particles densities are close to the mean field values. Then, in the spirit of the Dobrushin-Shlosman theory (Dobrushin and Shlosman in J. Stat. Phys. 46(5-6):983-1014, 1987), we prove that while the Dobrushin high-temperatures uniqueness condition does not hold, yet a finite size condition is verified for gamma small enough which implies uniqueness and exponential decay of correlations. In a second paper (De Masi et al. in Coexistence of ordered and disordered phases in Potts models in the continuum, 2008), we will use such a result to implement the Pirogov-Sinai scheme proving coexistence of S+1 extremal DLR measures
Coexistence of ordered and disordered phases in Potts models in the continuum
No full textThis is the second of two papers on a continuum version of the Potts model, where
particles are points in Rd , d ≥ 2, with a spin which may take S ≥ 3 possible values. Particles
with different spins repel each other via a Kac pair potential of range γ
−1, γ >0. In this
paper we prove phase transition, namely we prove that if the scaling parameter of the Kac
potential is suitably small, given any temperature there is a value of the chemical potential
such that at the given temperature and chemical potential there exist S +1 mutually distinct
DLR measures
Potts models in the continuum. Uniqueness and exponential decay in the restricted ensembles
No full textIn this paper we study a continuum version of the Potts model, where particles are points in R^d , d≥2, with a spin which may take S≥3 possible values. Particles with different spins repel each other via a Kac pair potential of range γ −1, γ>0. In mean field, for any inverse temperature β there is a value of the chemical potential λ β at which S+1 distinct phases coexist. We introduce a restricted ensemble for each mean field pure phase which is defined so that the empirical particles densities are close to the mean field values. Then, in the spirit of the Dobrushin-Shlosman theory (Dobrushin and Shlosman in J. Stat. Phys. 46(5–6):983–1014, 1987), we prove that while the Dobrushin high-temperatures uniqueness condition does not hold, yet a finite size condition is verified for γ small enough which implies uniqueness and exponential decay of correlations. In a second paper (De Masi et al. in Coexistence of ordered and disordered phases in Potts models in the continuum, 2008), we will use such a result to implement the Pirogov-Sinai scheme proving coexistence of S+1 extremal DLR measures
Galería de Historiadores: Retrato de Henry Vignaud
No full text"Galería de historiadores" es una sección del Boletín (primera serie) en la cual se rinde homenaje a historiadores argentinos fallecidos. Se presenta en formato de folleto suelto sin paginar e incluye un retrato y la firma del homenajead
Spatially-localized time dependent solutions including turbulence and their interactions in 2D Kolmogorov flow
No full textIn 2D Kolmogorov flow in small aspect ratio domains, spatially-localized solutions such as kink, traveling or time-dependent kink-antikink pars coexist. However, the conservation of the flow rate in the y direction strongly restrict combination of localized solutions and their positioning. We find that by adding a homogeneous flow U y their positioning is controlled and each of localized solutions including a spatially-localized chaos is isolated. Numerical results suggest that these isolated solutions can be elements constructing a whole flow
Characteristics of overlap region in high-Reynolds number turbulent channel flow
No full textDirect numerical simulation of the fully developed turbulent channel flows have been carried out at the Reynolds number based on the friction velocity and the channel half width, 2000, 4000 and 8000. A hybrid 10th order accurate finite difference scheme in the stream and spanwise directions, and a second-order scheme in the wall-normal direction is adapted as the spatial discretization method. We observed the plateau profiles in the indicator function corresponded to the von Karman constant. Furthermore, second peak of streamwise pre-multiplied spectra were appeared in the same wall normal height, 300 < y+ < 600, in case of Re = 4000. Nevertheless, the effects of the lager than the channel half height scale on the streamwise turbulent intensity are fixed contributions without dependence on Reynolds number. These results suggested that the new streamwise vortexes are formed between buffer layer and outer layer with increasing of Reynolds number
La 'circunstancia' de 'Herederos y Pretendientes
No full textIn June 2010, the Ortega y Gasset Foundation hosted a Conference about the “Spanish Philosophical Transition” in order to debate the book of Francisco Vázquez, La filosofía española. Herederos y Pretendientes. Una lectura sociológica (1963-1990), recently published. This paper is the author’s response to criticism raised in the Conference and to published reviews received by this book. First, the author summarized the argument of Herederos y pretendientes. Secondly he responds and takes into account the most important objections against the book’s hypothesis and methodology. Finally the author evaluates the favorable judgments received by the book and suggests the limits of the historian’s task.Fundación Ortega y Gasset-Marañó
Author self-citation in orthodontics is associated with author origin and gender.
No full textBACKGROUND
The aims of this bibliometric study were to determine author self-citation trends in high-impact orthodontic literature and to investigate possible association between self-citation and publication characteristics.
METHODS
Six orthodontic journals with the highest impact factor as ranked by 2017 Journal Citation Reports were screened for a full publication year (2018) for original research articles, reviews, and case reports. Eligible articles were scrutinized for article and author characteristics and citation metrics. Univariable and multivariable negative binomial regression was used to examine associations between self-citation incidence and publication characteristics.
RESULTS
Medians for author self-citation rate of the most self-citing authors and self-citations were 3.03% (range 0-50) and 1 (range 0-19), respectively. In the univariable analysis, there was no association between self-citation counts and study type (P = 0.41), article topic (P = 0.61), number of authors (P = 0.62), and rank of authors (P = 0.56). Author origin (P = 0.001), gender (P = 0.001) and journal (P = 0.05) were associated with self-citation counts and in the multivariable analysis only origin and gender remained strong self-citation predictors. Asian authors and females self-cited significantly less often than all other regions and male authors.
CONCLUSIONS
Authors in orthodontics do not self-cite at a frequency that suggests potential citation manipulation. Author origin and gender were the only variables associated with citations counts. More bibliometric research is necessary to draw solid conclusions about author self-citation trends in orthodontic literature
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