Possible Existence of an Extraordinary Phase in the Driven Lattice Gas

We report recent simulation results which might indicate the existence of a new low-temperature "phase" in an Ising lattice gas, driven into a non-equilibrium steady state by an external field. It appears that this "phase", characterized by multiple-strip configurations, is selected when square systems are used to approach the thermodynamic limit. We propose a quantitative criterion for the existence of such a "phase". If confirmed, its observation may resolve a long-standing controversy over the critical properties of the driven Ising lattice gas.Comment: 10 pages; 4 figure

Implementación de una PMO en una empresa de tecnología: un análisis comparativo de metodologías de proyectos

En este artículo se analizan tres modelos de administración de proyectos que han sido exitosos en su implantación particular en proyectos de Tecnologías de Información y Comunicación (TIC) 1. De manera puntual, se revisaron las implicaciones de las visiones que contemplan tres metodologías de Gerencia de Proyectos (GP) y se presenta una comparación de sus características, identificando como contribuyen al desempeño de una Oficina de Administración de Proyectos (Project Management Office, PMO) en una empresa de outsourcing de servicios de tecnología, con el fin de establecer cuál es la más apropiada y finalmente resumir que su fusión es optima para generar valor como proveedor de servicios de tecnología y comunicaciones.This article analyzes three Project Management models that have been successful in their particular execution on ICT projects. Particularly, the authors make an implication assessment of the three methodologies and present a comparison of their characteristics, looking forward to identify how they contribute to the performance of a Project Management Office (PMO), in the context of a technology services outsourcing company. All of this, to realize which method is the best, and then conclude that their mix is an optimal alternative to create value as a provider of technology services and communications

Diseño de plan de marketing para incrementar las ventas del Hotel Real Audiencia, ubicada en el Centro Histórico de Quito

Los servicios de hotelería y en especial los hoteles medianos se enfrentan ha procesos importantes de internacionalización de su actividad que necesariamente exigen una reconsideración de sus estrategias, esto ha incorporado elementos novedosos que ayudan a comprender el mayor protagonismo que en los últimos años detectan los mercados hoteleros. El presente trabajo busca determinar si resulta factible y rentable la implementación de nuevas estrategias de servicio de hospedaje, publicidad, preferencias y atractivos turísticos dotada de alta tecnología del HOTEL REAL AUDIENCIA ubicado en el Centro Histórico de Quito. Para establecer la factibilidad del proyecto se realiza un estudio de mercado para identificar y cuantificar al consumidor objetivo. Mediante un análisis interno y externo del negocio se determina los factores que tienen incidencia en la factibilidad del negocio.The hotel services and especially middle-hotels important cross internationalization processes of its activity that necessarily require a review of their strategies; it has incorporated new elements that help to understand the greater role that in recent years the hotel markets detected. This paper seeks to determine whether it is feasible and cost effective implementation of new hosting service strategies, advertising, preferences and attractions equipped with high-tech REAL AUDIENCIA HOTEL located in the historic center of Quito. To establish the feasibility of the project is market study to identify and quantify the target consumer. Through an analysis of internal and external business actors that determines the impact on the feasibility of the business

Thermodynamic relations in a driven lattice gas: numerical exprements

We explore thermodynamic relations in non-equilibrium steady states with numerical experiments on a driven lattice gas. After operationally defining the pressure and chemical potential in the driven lattice gas, we confirm numerically the validity of the integrability condition (the Maxwell relation) for the two quantities whose values differ from those for an equilibrium system. This implies that a free energy function can be constructed for the non-equilibrium steady state that we consider. We also investigate a fluctuation relation associated with this free energy function. Our result suggests that the compressibility can be expressed in terms of density fluctuations even in non-equilibrium steady states.Comment: 4 pages, 4 figure

Long range spatial correlation between two Brownian particles under external driving

We study the large distance behavior of a steady distribution of two Brownian particles under external driving in a two-dimensional space. Employing a method of perturbative system reduction, we analyze a Fokker-Planck equation that describes the time evolution of the probability density for the two particles. The expression we obtain shows that there exist a long range correlation between the two particles, of $1/r^2$ type.Comment: 11 page

A comprehensive asteroseismic modelling of the high-amplitude delta Scuti star RV Arietis

We present a comprehensive asteroseismic study of the double-mode high-amplitude delta Scuti star HD 187642 (RV Arietis). The modelling includes some of the most recent techniques: 1) effects of rotation on both equilibrium models and adiabatic oscillation spectrum, 2) non-adiabatic study of radial and non-radial modes, 3) relationship between the fundamental radial mode and the first overtone in the framework of Petersen diagrams. The analysis reveals that two of the observed frequencies are very probably identified as the fundamental and first overtone radial modes. Analysis of the colour index variations, together with theoretical non-adiabatic calculations, points to models in the range of [7065,7245] K in effective temperature and of [1190, 1270] Myr in stellar age. These values were found to be compatible with those obtained using the three other asteroseismic techniques.Comment: accepted for publication in A&

Thermal and mechanical properties of W/Cu composite materials for ITER heat sink applications

One of the main challenges in the development of a fusion power plant is the adequate selection of the materials that will withstand the extreme conditions of temperature, load and radiation. Among those issues, the control of the heat removal by the divertor is critical, hence the highest heat load inside the reactor will be found in it. For this purpose, one solution proposed is a novel optimized water-cooled monoblock divertor consisting of W as plasma facing material and W/Cu composites as the baseline heat sink material. The attraction of these metal matrix composites in fusion applications is twofold: the W matrix provides the necessary strength of the composite at high temperatures, while Cu provides the required high thermal conductivity for efficient heat removal in the cooling system. In this context, the goal of this study is the characterization of W-Cu composite materials produced by means of liquid Cu infiltration of open porous W preforms. In order to achieve it, a new experimental device was set up to test the composites under high vacuum atmosphere while in the temperature range between 273 K and 1073 K. Tensile and fracture tests in three point bending configuration have been conducted in this temperature range and atmosphere. Additionally, micromechanical and physical characterization was also performed by means of micro and nanoindentation and High Temperature X-Ray Diffraction respectively

A Study of Two-Temperature Non-Equilibrium Ising Models: Critical Behavior and Universality

We study a class of 2D non-equilibrium Ising models based on competing dynamics induced by contact with heat-baths at two different temperatures. We make a comparative study of the non-equilibrium versions of Metropolis, heat bath/Glauber and Swendsen-Wang dynamics and focus on their critical behavior in order to understand their universality classes. We present strong evidence that some of these dynamics have the same critical exponents and belong to the same universality class as the equilibrium 2D Ising model. We show that the bond version of the Swendsen-Wang update algorithm can be mapped into an equilibrium model at an effective temperature.Comment: 12 pages of LaTeX plus 18 pages of postscript figures in a uuencoded file (608k

¿Estamos preparados para trabajar en red? : Interoperabilidad: desafíos para la región latinoamericana

La presentación remarca la importancia de unificar, en la medida de lo posible, los estándares, directrices y protocolos de los repositorios para que la interoperabilidad sea un hecho.Panel LibLink.Ibero-American Science and Technology Education Consortium (ISTEC