16,778 research outputs found

    Magnetic Properties of the Metamagnet Ising Model in a three-dimensional Lattice in a Random and Uniform Field

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    By employing the Monte Carlo technique we study the behavior of Metamagnet Ising Model in a random field. The phase diagram is obtained by using the algorithm of Glaubr in a cubic lattice of linear size LL with values ranging from 16 to 42 and with periodic boundary conditions.Comment: 4 pages, 6 figure

    Analytical study of tunneling times in flat histogram Monte Carlo

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    We present a model for the dynamics in energy space of multicanonical simulation methods that lends itself to a rather complete analytic characterization. The dynamics is completely determined by the density of states. In the \pm J 2D spin glass the transitions between the ground state level and the first excited one control the long time dynamics. We are able to calculate the distribution of tunneling times and relate it to the equilibration time of a starting probability distribution. In this model, and possibly in any model in which entering and exiting regions with low density of states are the slowest processes in the simulations, tunneling time can be much larger (by a factor of O(N)) than the equilibration time of the probability distribution. We find that these features also hold for the energy projection of single spin flip dynamics.Comment: 7 pages, 4 figures, published in Europhysics Letters (2005

    Siscero - Sistema de clipping da Embrapa Rondônia.

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    O Siscero, ou Sistema de clipping da Embrapa Rondônia, é uma aplicação desenvolvida em plataforma web para o registro de matérias jornalísticas ou outras inserções na mídia que envolvam a Embrapa Rondônia. As informações são armazenadas em banco de dados relacional e o sistema permite o registro de arquivos digitais, como imagem, PDF, áudio ou vídeo. Uma interface de pesquisa oferece uma série de filtros para busca de registros e gráficos interativos permitem avaliar, comparar e monitorar o desempenho da Empresa na mídia. Este documento contextualiza o clipping no universo corporativo, faz uma retrospectiva das iniciativas passadas e da situação atual do clipping realizado pela Embrapa e apresenta o Siscero como uma ferramenta estratégica. Um manual para utilização do sistema e um guia de instalação também fazem parte do conteúdo.bitstream/item/35944/1/doc137-siscero.pd

    Is the effect of birth weight on early breast cancer mediated through childhood growth?

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