<?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>S0035-001X2012000100008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On the centre of mass velocity in molecular dynamics simulations]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-Maldonado]]></surname>
<given-names><![CDATA[G.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Melchor]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alejandre]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chapela]]></surname>
<given-names><![CDATA[G.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Ciencias Físico-Matemáticas ]]></institution>
<addr-line><![CDATA[ Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Instituto de Física Luis Rivera Terrazas ]]></institution>
<addr-line><![CDATA[ Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Química ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2012</year>
</pub-date>
<volume>58</volume>
<numero>1</numero>
<fpage>55</fpage>
<lpage>60</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2012000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2012000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2012000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Molecular dynamics simulations are performed on a fluid at supercritical conditions to analyze the effect that the velocity of centre of mass (VCOM) of the system has on temperature and phase stability. Standard rescaling velocities and Nosé-Hoover chains of thermostats methods are used to carry out simulations on Square Well, Lennard-Jones and Soft Primitive potential models. Removing the VCOM at the beginning or during the simulation is not required for the Nosé-Hoover chain of thermostats to keep the correct temperature of the system, however, it is fundamental to keep null the VCOM when the traditional rescaling velocity scheme is used. It is shown that if the VCOM is removed only at the beginning of the simulation the internal and external temperatures are not the same for very long simulations and the fluid becomes a solid. The temperatures and physical properties obtained using the Nosé-Hoover chain method are the same as those obtained by removing the VCOM during the simulation in the rescaling velocity procedure.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Realizamos simulaciones de dinámica molecular en fluidos a condiciones supercríticas para analizar el efecto que la velocidad del centro de masa (VCM) del sistema tiene sobre la temperatura y la estabilidad de fases. Escalamiento estándar de velocidades y cadenas de Nosé-Hoover son usados como métodos de termostato para realizar simulaciones en modelos de potencial de pozo cuadrado, Lennard-Jones y el modelo primitivo suave. Remover la VCM al inicio o durante la simulación no es requerido para que el termostato de cadenas de Nosé-Hoover mantenga la temperatura correcta del sistema, sin embargo es fundamental mantener nula la VCM cuando se usa el esquema tradicional de escalamiento de velocidades. Se muestra que si la VCM es removida solo al inicio de la simulación las temperaturas interna y externa no son iguales para tiempos de simulación muy grandes y el sistema se solidifica. La temperatura y las propiedades físicas obtenidas usando el método de cadenas de Nosé-Hoover son iguales a aquellas obtenidas usando escalamiento de velocidades donde se remueve la VCM durante la simulación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Molecular dynamics]]></kwd>
<kwd lng="en"><![CDATA[scaling velocities]]></kwd>
<kwd lng="en"><![CDATA[Nosé-Hoover chains]]></kwd>
<kwd lng="en"><![CDATA[centre of mass velocity]]></kwd>
<kwd lng="es"><![CDATA[Dinámica molecular]]></kwd>
<kwd lng="es"><![CDATA[escalamiento de velocidades]]></kwd>
<kwd lng="es"><![CDATA[cadenas de Nosé-Hoover]]></kwd>
<kwd lng="es"><![CDATA[velocidad del centro de masa]]></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="4">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>On the centre of mass velocity in molecular dynamics simulations</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>G.A. M&eacute;ndez&#150;Maldonado<sup>1</sup>, M. Gonz&aacute;lez&#150;Melchor<sup>2</sup>, J. Alejandre<sup>3</sup> and G.A. Chapela<sup>4</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Facultad de Ciencias F&iacute;sico&#150;Matem&aacute;ticas, Benem&eacute;rita Universidad Aut&oacute;noma de Puebla, Apartado Postal 1152, Puebla, 72570, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto de F&iacute;sica Luis Rivera Terrazas, Benemerita Universidad Aut&oacute;noma de Puebla, Apartado Postal J&#150;48, Puebla, 72570, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Departamento de Qu&iacute;mica, Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340, M&eacute;xico D.F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>4</sup> Departamento de F&iacute;sica, Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340, M&eacute;xico D.F., 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 30 de agosto de 2011.    <br> Aceptado el 28 de noviembre de 2011.</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">Molecular dynamics simulations are performed on a fluid at supercritical conditions to analyze the effect that the velocity of centre of mass (VCOM) of the system has on temperature and phase stability. Standard rescaling velocities and Nos&eacute;&#150;Hoover chains of thermostats methods are used to carry out simulations on Square Well, Lennard&#150;Jones and Soft Primitive potential models. Removing the VCOM at the beginning or during the simulation is not required for the Nos&eacute;&#150;Hoover chain of thermostats to keep the correct temperature of the system, however, it is fundamental to keep null the VCOM when the traditional rescaling velocity scheme is used. It is shown that if the VCOM is removed only at the beginning of the simulation the internal and external temperatures are not the same for very long simulations and the fluid becomes a solid. The temperatures and physical properties obtained using the Nos&eacute;&#150;Hoover chain method are the same as those obtained by removing the VCOM during the simulation in the rescaling velocity procedure.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Molecular dynamics; scaling velocities; Nos&eacute;&#150;Hoover chains; centre of mass velocity.</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">Realizamos simulaciones de din&aacute;mica molecular en fluidos a condiciones supercr&iacute;ticas para analizar el efecto que la velocidad del centro de masa (VCM) del sistema tiene sobre la temperatura y la estabilidad de fases. Escalamiento est&aacute;ndar de velocidades y cadenas de Nos&eacute;&#150;Hoover son usados como m&eacute;todos de termostato para realizar simulaciones en modelos de potencial de pozo cuadrado, Lennard&#150;Jones y el modelo primitivo suave. Remover la VCM al inicio o durante la simulaci&oacute;n no es requerido para que el termostato de cadenas de Nos&eacute;&#150;Hoover mantenga la temperatura correcta del sistema, sin embargo es fundamental mantener nula la VCM cuando se usa el esquema tradicional de escalamiento de velocidades. Se muestra que si la VCM es removida solo al inicio de la simulaci&oacute;n las temperaturas interna y externa no son iguales para tiempos de simulaci&oacute;n muy grandes y el sistema se solidifica. La temperatura y las propiedades f&iacute;sicas obtenidas usando el m&eacute;todo de cadenas de Nos&eacute;&#150;Hoover son iguales a aquellas obtenidas usando escalamiento de velocidades donde se remueve la VCM durante la simulaci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Din&aacute;mica molecular; escalamiento de velocidades; cadenas de Nos&eacute;&#150;Hoover; velocidad del centro de masa.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 83.10.Rs; 61.20.Ja; 78.30.cd</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/v58n1/v58n1a8.pdf" target="_blank">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">G.A.M.M. and M.G.M. acknowledge financial support from CONACyT (Project 129034), VIEP&#150;BUAP (GOMMEXC10&#150;I), PROMEP/103.5/07/2594 and CA F&iacute;sica Computacional de la Materia Condensada. JA and GAC thank Conacyt (Project 81667) for financial support and to Laboratorio de Supercomputo for allocation time.</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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