<?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>S0035-001X2007000500001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[First-principles predictor of the location of ergodic/non-ergodic transitions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-González]]></surname>
<given-names><![CDATA[P.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez-Maldonado]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yeomans-Reyna]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Rojo]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Páez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vizcarra-Rendón]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina-Noyola]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autonoma de San Luis Potosí Instituto de Física Manuel Sandoval Vallarta ]]></institution>
<addr-line><![CDATA[San Luis Potosí SLP]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Sonora Departamento de Física ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma de Chihuahua Facultad de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Autónoma de Zacatecas Unidad Académica de Física ]]></institution>
<addr-line><![CDATA[Zacatecas Zac]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<numero>5</numero>
<fpage>327</fpage>
<lpage>331</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000500001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000500001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000500001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[This letter presents a remarkably simple approach to the first-principles determination of the ergodic/non-ergodic transition in monodisperse colloidal suspensions. It consists of an equation for the long-time asymptotic value<img src="../../../../../img/revistas/rmf/v53n5/a1s1.jpg"> of the mean squared displacement of the colloidal particles, whose finite real solutions signal the non-ergodic state,and determines the non-ergodic parameter &#402; (k). We illustrate its concrete application to three simple model colloidal systems, namely, hard-spheres, hard-spheres plus repulsive (screened Coulomb) Yukawa interaction, and hard-sphere plus attractive Yukawa tail. The results indicate that this is quite a competitive theory, similar in spirit to, but conceptually independent from, the well-known mode coupling theory.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Esta carta presenta un método notablemente simple para la determinación, de primeros principios, de la transición ergódico/no-ergódico en suspensiones coloidales monodispersas. Dicho método consiste en una ecuación para el valor asintótico a tiempos largos,<img src="../../../../../img/revistas/rmf/v53n5/a1s1.jpg"> , del desplazamiento cuadratico medio de las partículas coloidales, cuyas soluciones reales finitas son sinonimo de no-ergodicidad, y determinan el parámetro no-ergódico &#402; (k). Ilustramos su aplicacion concreta en tres modelos simples de sistemas coloidales, a saber, esferas duras, esferas duras con interaccion de Yukawa repulsiva (Coulombica apantallada), y esferas duras con interacción de Yukawa atractiva (fuerzas de deplecion). Los resultados indican que ésta es una teoría muy competitiva, similar en espíritu, pero conceptualmente diferente, a la bien conocida teoría de acoplamiento de modos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Colloidal dynamics]]></kwd>
<kwd lng="en"><![CDATA[glass transition]]></kwd>
<kwd lng="en"><![CDATA[dynamic arrest]]></kwd>
<kwd lng="es"><![CDATA[Dinámica coloidal]]></kwd>
<kwd lng="es"><![CDATA[transición vítrea]]></kwd>
<kwd lng="es"><![CDATA[arresto dinámico]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Cartas</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>First-principles predictor of the location of ergodic/non-ergodic transitions</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>P.E. Ram&iacute;rez-Gonz&aacute;lez&ordf;</b><b>, R. Ju&aacute;rez-Maldonado&ordf;, L. Yeomans-Reyna<sup>b</sup>, M.A. Ch&aacute;vez-Rojo<sup>c</sup>, M. Ch&aacute;vez-P&aacute;ez&ordf;, A. Vizcarra-Rend&oacute;n<sup>d</sup>, and M. Medina-Noyola&ordf;</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Instituto de F&iacute;sica Manuel Sandoval Vallarta, Universidad Autonoma de San Luis Potos&iacute;, &Aacute;lvaro Obreg&oacute;n 64, 78000 San Luis Potos&iacute;, SLP, M&eacute;xico</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b </sup>Departamento de F&iacute;sica, Universidad de Sonora, Boulevard Luis Encinas y Rosales, 83000 Hermosillo, Sonora, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Facultad de Ciencias Qu&iacute;micas, Universidad Aut&oacute;noma de Chihuahua, Venustiano Carranza S/N, 31000 Chihuahua, Chih., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>d</sup> Unidad Acad&eacute;mica de F&iacute;sica, Universidad Aut&oacute;noma de Zacatecas, Paseo la Bufa y Calzada Solidaridad, 98600 Zacatecas, Zac, M&eacute;xico.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 1 de junio de 2007    <br> Aceptado el 21 de agosto de 2007</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 letter presents a remarkably simple approach to the first-principles determination of the ergodic/non-ergodic transition in monodisperse colloidal suspensions. It consists of an equation for the long-time asymptotic value<img src="/img/revistas/rmf/v53n5/a1s1.jpg">  of the mean squared displacement of the colloidal particles, whose finite real solutions signal the non-ergodic state,and determines the non-ergodic parameter <i>&fnof; </i><i>(k). </i>We illustrate its concrete application to three simple model colloidal systems, namely, hard-spheres, hard-spheres plus repulsive (screened Coulomb) Yukawa interaction, and hard-sphere plus attractive Yukawa tail. The results indicate that this is quite a competitive theory, similar in spirit to, but conceptually independent from, the well-known mode coupling theory.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Colloidal dynamics; glass transition; dynamic arrest.</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">Esta carta presenta un m&eacute;todo notablemente simple para la determinaci&oacute;n, de primeros principios, de la transici&oacute;n erg&oacute;dico/no-erg&oacute;dico en suspensiones coloidales monodispersas. Dicho m&eacute;todo consiste en una ecuaci&oacute;n para el valor asint&oacute;tico a tiempos largos,<img src="/img/revistas/rmf/v53n5/a1s1.jpg"> , del desplazamiento cuadratico medio de las part&iacute;culas coloidales, cuyas soluciones reales finitas son sinonimo de no-ergodicidad, y determinan el par&aacute;metro no-erg&oacute;dico <i>&fnof; (k). </i>Ilustramos su aplicacion concreta en tres modelos simples de sistemas coloidales, a saber, esferas duras, esferas duras con interaccion de Yukawa repulsiva (Coulombica apantallada), y esferas duras con interacci&oacute;n de Yukawa atractiva (fuerzas de deplecion). Los resultados indican que &eacute;sta es una teor&iacute;a muy competitiva, similar en esp&iacute;ritu, pero conceptualmente diferente, a la bien conocida teor&iacute;a de <i>acoplamiento de modos.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Din&aacute;mica coloidal; transici&oacute;n v&iacute;trea; arresto din&aacute;mico.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 64.70.Pf; 61.20.Gy; 47.57.J-</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/v53n5/v53n5a1.pdf">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was supported by the Consejo Nacional de Ciencia y Tecnolog&iacute;a (CONACYT, Mexico), grants Nos. C01-47611 and C02-44744. The authors are deeply indebted to Profs. J. Bergenholtz, A. Banchio, G. Nagele, and V Romero-Rochin for very useful discussions.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     ]]></body>
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<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Klein]]></surname>
<given-names><![CDATA[M.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Physica]]></source>
<year>1974</year>
<numero>73</numero>
<issue>73</issue>
<page-range>28</page-range></nlm-citation>
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<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McQuarrie]]></surname>
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</name>
</person-group>
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