Search results for "ISING"
showing 10 items of 1141 documents
Absence of hyperscaling violations for phase transitions with positive specific heat exponent
1994
Finite size scaling theory and hyperscaling are analyzed in the ensemble limit which differs from the finite size scaling limit. Different scaling limits are discussed. Hyperscaling relations are related to the identification of thermodynamics as the infinite volume limit of statistical mechanics. This identification combined with finite ensemble scaling leads to the conclusion that hyperscaling relations cannot be violated for phase transitions with strictly positive specific heat exponent. The ensemble limit allows to derive analytical expressions for the universal part of the finite size scaling functions at the critical point. The analytical expressions are given in terms of generalH-fu…
Finite-size scaling approach for critical wetting: rationalization in terms of a bulk transition with an order parameter exponent equal to zero.
2012
Clarification of critical wetting with short-range forces by simulations has been hampered by the lack of accurate methods to locate where the transition occurs. We solve this problem by developing an anisotropic finite-size scaling approach and show that then the wetting transition is a ``bulk'' critical phenomenon with order parameter exponent equal to zero. For the Ising model in two dimensions, known exact results are straightforwardly reproduced. In three dimensions, it is shown that previous estimates for the location of the transition need revision, but the conclusions about a slow crossover away from mean-field behavior remain unaltered.
Multicanonical Monte Carlo study and analysis of tails for the order-parameter distribution of the two-dimensional Ising model.
2003
The tails of the critical order-parameter distribution of the two-dimensional Ising model are investigated through extensive multicanonical Monte Carlo simulations. Results for fixed boundary conditions are reported here, and compared with known results for periodic boundary conditions. Clear numerical evidence for ‘‘fat’’ stretched exponential tails exists below the critical temperature, indicating the possible presence of fat tails at the critical temperature. Our work suggests that the true order-parameter distribution at the critical temperature must be considered to be unknown at present.
Models for highway traffic and their connections to thermodynamics
2007
Models for highway traffic are studied by numerical simulations. Of special interest is the spontaneous formation of traffic jams. In a thermodynamic system the traffic jam would correspond to the dense phase (liquid) and the free flowing traffic would correspond to the gas phase. Both phases depending on the density of cars can be present at the same time. A model for a single lane circular road has been studied. The model is called the optimal velocity model (OVM) and was developed by Bando, Sugiyama, et al. We propose here a reformulation of the OVM into a description in terms of potential energy functions forming a kind of Hamiltonian for the system. This will however not be a globally …
Wetting in fluid systems. Wetting and capillary condensation of lattice gases in thin film geometry
1994
Monte Carlo studies of lattice gas models with attractive interactions between nearest neighbors on a simple cubic lattice are carried out for a L×L×D geometry with two hard walls of size L×L and periodic boundary conditions parallel to the wall. Two types of short-range forces at the walls are considered: (i) Both walls are of the same type and exert an attractive force of the same strength (in Ising model terminology, surface fields HD = H1 occur). (ii) The walls differ, one attracts and the other repels particles, again with the same strength (HD = −H1). In the first case, capillary condensation occurs at a chemical potential differing from its value for phase coexistence in the bulk, an…
Anglicisms in Tourism Language Corpora 2.0
2015
Abstract The world of tourism has evolved in recent times because of the impact of the Internet. Tourism enterprises have expanded their commercial point of view and have found a faster way to reach clients through increased tourism advertising on the Web. Along with this increase in advertising are the opportunities to study the lexicon of tourism. One of the main points in this lexicon is the use of foreign words, especially the use of Anglicisms due to English's status as a universal language in these contexts. In this article, we will study the Anglicisms in Spanish tourism from these points of view: • why these words are used; • in what context they are used; • if we use original forei…
Ads and sensationalism: the irruption of mass advertising
2018
El siglo XX es, entre otras lecturas, el siglo de la publicidad. Y, por supuesto, es también el tiempo del sensacionalismo como nueva forma de entender la comunicación dirigida a los nuevos públicos masivos que se están configurando. Sin embargo, mientras el sensacionalismo periodístico se ha observado con cierto interés por cuanto ha presidido acontecimientos de gran calado de fines del siglo XIX y ha preparado la irrupción de la propaganda científica que se produce ya con la Gran Guerra, no ha sucedido lo mismo con las estrategias seguidas por los anuncios para alcanzar el mismo fin, esto es, la venta masiva del producto. Y, desde nuestro punto de vista, sensacionalismo y publicidad empez…
La repercusión científica de una revista académica: análisis del caso de RELIEVE
2014
Se analizan diversos factores que determinan la repercusión científica de una revista académica. Los datos indican que tanto la calidad reconocida como las encuestas de opinión entre académicos, las demandas de información que atrae, citas que recibe, difusión, audiencia o capacidad de atracción denotan una alta repercusión de RELIEVE.
Disinformation in Facebook Ads in the 2019 Spanish General Election Campaigns
2021
Producción Científica
Communicative differences between emergent and traditional parties: An analysis of Facebook posts from Spain’s 2015 general election campaign
2019
Social media has revolutionized political communication. It offers political parties a mass communication channel that lets them customize and create direct communication with citizens. This study analyses the posts of the main Spanish political parties on their Facebook pages during the 2015 general elections campaign. We quantitatively analyse the parties’ frequency of publication on this social network and the content of their messages through a computerized content analysis. The results indicate that traditional and emergent parties manage their Facebook pages in distinct ways.; Las redes sociales han supuesto una revolución para la comunicación política, posibilita a los partidos tener…