<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2014000600006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diagrama de fase sitio-enlace en dímeros]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lebrecht]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[M. I.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdés]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de la Frontera Departamento de Física ]]></institution>
<addr-line><![CDATA[Temuco Cautín]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de San Luis Departamento de Física ]]></institution>
<addr-line><![CDATA[San Luis ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2014</year>
</pub-date>
<volume>60</volume>
<numero>6</numero>
<fpage>466</fpage>
<lpage>472</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2014000600006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2014000600006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2014000600006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo se presenta un cálculo analítico aproximado para caracterizar la percolación en un sistema donde coexisten dímeros de sitios y enlaces en una red cuadrada. Un dímero es la representación más simple de individuos ligados a primeros vecinos. Se calculan funciones de percolación representadas por polinomios, obtenidas mediante enumeración numérica en una celda tamaño N = Lx x Ly para dímeros de sitios y de enlaces. En el límite termodinámico se encuentra que el umbral de percolación para dímeros de sitios (enlaces) es 0.562 (0.486). Para determinar el diagrama de fase sitio - enlace en dímeros, se utilizan operaciones OR y AND en las funciones de percolación que representan las celdas finitas. Tanto los valores del umbral de percolación, como el diagrama de fase sitio - enlace están en correspondencia con sus similares obtenidos mediante simulaciones numéricas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This paper presents an approximate analytical calculation to characterize the percolation in a system where coexist bonds and sites dimers. A dimer is the simplest representation of individuals who are bound to nearest neighbors. Percolation functions represented by polynomials, obtained by numerical listing of a cell of size N = Lx x Ly for sites and bonds dimers are calculated. In the thermodynamic limit, the percolation threshold for site dimer (bond dimer) is 0.562 (0.486) on a square lattice, values that are in line with their counterparts obtained by numerical simulations. To determine the site-bond phase diagram of dimers on a square lattice, the OR and AND operations associated to the functions of a finite percolation cell are used and performed well with similar results in numerical simulations shown in the literature.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Percolación]]></kwd>
<kwd lng="es"><![CDATA[umbral de percolación]]></kwd>
<kwd lng="es"><![CDATA[diagrama de fase para umbrales de percolación de dímeros]]></kwd>
<kwd lng="en"><![CDATA[Percolation]]></kwd>
<kwd lng="en"><![CDATA[percolation threshold]]></kwd>
<kwd lng="en"><![CDATA[phase diagram dimer percolation threshold]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Diagrama de fase sitio&#45;enlace en d&iacute;meros</b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>W. Lebrecht&ordf;, M. I. Gonz&aacute;lez<sup>b</sup> y J. F. Vald&eacute;s&ordf;</b></font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>a</i></sup> <i>Departamento de F&iacute;sica, Universidad de La Frontera, Casilla 54&#45;D, Temuco, Chile.</i></font> <font face="verdana" size="2"><i>e&#45;mail:</i> <a href="mailto:walter.lebrecht@ufrontera.cl">walter.lebrecht@ufrontera.cl</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Departamento de F&iacute;sica, INFAP, Universidad Nacional de San Luis, Chacabuco 917, San Luis, Argentina. e&#45;mail: </i><a href="mailto:migonzalez@unsl.edu.ar">migonzalez@unsl.edu.ar</a><i>; </i><a href="mailto:julio.valdes@ufrontera.cl">julio.valdes@ufrontera.cl</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received 1 August 2014.    <br> 	Accepted 11 October 2014.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En este trabajo se presenta un c&aacute;lculo anal&iacute;tico aproximado para caracterizar la percolaci&oacute;n en un sistema donde coexisten d&iacute;meros de sitios y enlaces en una red cuadrada. Un d&iacute;mero es la representaci&oacute;n m&aacute;s simple de individuos ligados a primeros vecinos. Se calculan funciones de percolaci&oacute;n representadas por polinomios, obtenidas mediante enumeraci&oacute;n num&eacute;rica en una celda tama&ntilde;o <i>N = L<sub>x</sub> x L<sub>y</sub></i> para d&iacute;meros de sitios y de enlaces. En el l&iacute;mite termodin&aacute;mico se encuentra que el umbral de percolaci&oacute;n para d&iacute;meros de sitios (enlaces) es 0.562 (0.486). Para determinar el diagrama de fase sitio &#45; enlace en d&iacute;meros, se utilizan operaciones OR y AND en las funciones de percolaci&oacute;n que representan las celdas finitas. Tanto los valores del umbral de percolaci&oacute;n, como el diagrama de fase sitio &#45; enlace est&aacute;n en correspondencia con sus similares obtenidos mediante simulaciones num&eacute;ricas.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Percolaci&oacute;n; umbral de percolaci&oacute;n; diagrama de fase para umbrales de percolaci&oacute;n de d&iacute;meros.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">This paper presents an approximate analytical calculation to characterize the percolation in a system where coexist bonds and sites dimers. A dimer is the simplest representation of individuals who are bound to nearest neighbors. Percolation functions represented by polynomials, obtained by numerical listing of a cell of size <i>N = L<sub>x</sub> x L<sub>y</sub></i> for sites and bonds dimers are calculated. In the thermodynamic limit, the percolation threshold for site dimer (bond dimer) is 0.562 (0.486) on a square lattice, values that are in line with their counterparts obtained by numerical simulations. To determine the site&#45;bond phase diagram of dimers on a square lattice, the OR and AND operations associated to the functions of a finite percolation cell are used and performed well with similar results in numerical simulations shown in the literature.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Percolation; percolation threshold; phase diagram dimer percolation threshold.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 64.60.Ak; 64.60.Fr</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v60n6/v60n6a6.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Los autores agradecen a la Direcci&oacute;n de Investigaci&oacute;n de la Universidad de La Frontera a trav&eacute;s del proyecto DIUFRO DI13&#45;0102 por el apoyo parcial en el desarrollo de este trabajo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. 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