<?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>1870-3542</journal-id>
<journal-title><![CDATA[Revista mexicana de física E]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fís. E]]></abbrev-journal-title>
<issn>1870-3542</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-35422006000200005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[An alternative method of solution to radiative transfer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Aquino]]></surname>
<given-names><![CDATA[J.I.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Guerrero N]]></surname>
<given-names><![CDATA[A.C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Física ]]></institution>
<addr-line><![CDATA[Iztapalapa Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Ingeniería de Procesos e Hidráulica ]]></institution>
<addr-line><![CDATA[Iztapalapa Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<numero>2</numero>
<fpage>126</fpage>
<lpage>131</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-35422006000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-35422006000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-35422006000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this work, we propose an alternative method for solving a to radiative transfer equation in the four-stream approximation following the ideas of Jimenez-Aquino and Varela (2005). We use the Li and Ramaswamy (1995) proposal to establish the set of four coupled first-order differential equations associated with the radiances or radiative intensities. The method consists in transforming those four coupled differential equations into a set of four independent fourth-order differential equations associated with the quantities Ms and Md, which represent the sum and the difference respectively of two radiative intensities. As a consequence of this fact, the solutions for the radiative intensities are then easily calculated, and no matrix method is required.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo proponemos un método de solución alternativo a las ecuaciones de transferencia de radiación en la aproximación de cuatro flujos, siguiendo las ideas propuestas por Jiménez-Aquino and Varela (2005). Usamos la propuesta de Li and Ramaswamy (1995), para establecer un conjunto acoplado de cuatro ecuaciones diferenciales de primer orden asociados a las intensidades de radiación. El método consiste en transformar esas cuatro ecuaciones acopladas en un conjunto de cuatro ecuaciones diferenciales independientes, asociados a las cantidades Ms y Md, las cuales representan la suma y la diferencia de dos intensidades de radiación respectivamente. Como consecuencia de este hecho, las soluciones para las intensidades de radiación son obtenidas fácilmente sin el requerimiento de algún método matricial.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Scattering]]></kwd>
<kwd lng="en"><![CDATA[polarization]]></kwd>
<kwd lng="en"><![CDATA[radiative transfer equation]]></kwd>
<kwd lng="es"><![CDATA[Dispersión]]></kwd>
<kwd lng="es"><![CDATA[polarización]]></kwd>
<kwd lng="es"><![CDATA[ecuación de transferencia radiativa]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Ense&ntilde;anza</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>An alternative method of solution to radiative transfer</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>J.I. Jim&eacute;nez&#45;Aquino<sup>a</sup>, J.R. Varela<sup>b</sup>, and A.C. P&eacute;rez&#45;Guerrero N.<sup>a</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>a</sup> Departamento de F&iacute;sica Universidad Aut&oacute;noma Metropolitana&#45;Iztapalapa Apartado Postal 55&#45;534, 09340, M&eacute;xico, D.F., M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Departamento de Ingenier&iacute;a de Procesos e Hidr&aacute;ulica</i> <i>Universidad Aut&oacute;noma Metropolitana&#45;Iztapalapa Apartado Postal 55&#45;534, 09340, M&eacute;xico, D.F., M&eacute;xico.</i></font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 28 de abril de 2005;    <br> 	aceptado el 6 de diciembre de 2005</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">In this work, we propose an alternative method for solving a to radiative transfer equation in the four&#45;stream approximation following the ideas of Jimenez&#45;Aquino and Varela (2005). We use the Li and Ramaswamy (1995) proposal to establish the set of four coupled first&#45;order differential equations associated with the <i>radiances</i> or radiative intensities. The method consists in transforming those four coupled differential equations into a set of four independent fourth&#45;order differential equations associated with the quantities <i>M<sup>s</sup></i> and <i>M<sup>d</sup>,</i> which represent the sum and the difference respectively of two radiative intensities. As a consequence of this fact, the solutions for the radiative intensities are then easily calculated, and no matrix method is required.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Scattering; polarization; radiative transfer equation.</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 proponemos un m&eacute;todo de soluci&oacute;n alternativo a las ecuaciones de transferencia de radiaci&oacute;n en la aproximaci&oacute;n de cuatro flujos, siguiendo las ideas propuestas por Jim&eacute;nez&#45;Aquino and Varela (2005). Usamos la propuesta de Li and Ramaswamy (1995), para establecer un conjunto acoplado de cuatro ecuaciones diferenciales de primer orden asociados a las intensidades de radiaci&oacute;n. El m&eacute;todo consiste en transformar esas cuatro ecuaciones acopladas en un conjunto de cuatro ecuaciones diferenciales independientes, asociados a las cantidades <i>M<sup>s</sup></i> y <i>M<sup>d</sup>,</i> las cuales representan la suma y la diferencia de dos intensidades de radiaci&oacute;n respectivamente. Como consecuencia de este hecho, las soluciones para las intensidades de radiaci&oacute;n son obtenidas f&aacute;cilmente sin el requerimiento de alg&uacute;n m&eacute;todo matricial.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Dispersi&oacute;n; polarizaci&oacute;n; ecuaci&oacute;n de transferencia radiativa.</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: 42.68.Db; 42.68.Mj</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmfe/v52n2/v52n2a5.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">The authors wish to thank R.M. Velasco for her comments. Financial support from Consejo Nacional de Ciencia y Tecnolog&iacute;a (CONACYT) Mexico is also gratefully acknowledged. Proyect 1790P&#45;E9507.</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>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. J.I. Jim&eacute;nez&#45;Aquino and J.R. Varela, <i>Rev. Mex. Fis.</i> <b>51</b> (1) (2005) 82.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8446089&pid=S1870-3542200600020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">2. A. Schuster, <i>Astrophysics. 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