<?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>S0035-001X2002000400009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Universal relations for three-dimensional thermal, electric and magnetic properties]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sabina]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garza-Hume]]></surname>
<given-names><![CDATA[C. E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de Mëxico Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>4</numero>
<fpage>335</fpage>
<lpage>338</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[A periodic fibre-reinforced two phase material is considered here. The material properties of the constituents are anisotropic and may be specified by either the thermal, electrical conductivity, dielectric or magnetic permeability tensor. The orientation of each of the characteristic directions of the material is not parallel to the axis of geometric symmetry. The asymptotic homogenization method is used to study this doubly periodic composite. The interface between fibres and matrix must conform with the periodicity, but otherwise is arbitrary and may be disjoint in the periodic cell. A connection is found among the solutions of the three local problems that appear in the implementation of the method. This relation is basic for the elementary derivation of three universal relations for this three dimensional scalar problem. Several examples show how to relate the structure of the material tensor considered in this paper to that provided by the material data.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se considera un material periódico de dos fases reforzado por fibras. Las propiedades materiales de las componentes son anisótropas y pueden especificarse por el tensor, ya sea térmico, de conductividad eléctrica, de permeabilidad dieléctrica o magnética. La orientación de cada una de las direcciones características del material no es paralela al eje de simetría geométrica. Se usa el método de homogeneización asintótica para estudiar este compuesto doblemente periódico. La intercara entre fibras y matriz debe cumplir con la periodicidad, pero por lo demás es arbitraria y puede ser disjunta en la celda periódica. Se encuentra una conexión entre las soluciones de los tres problemas locales que aparecen en la instrumentación del método. Esta relación es básica para la derivación elemental de tres relaciones universales para este problema tridimensional escalar. Varios ejemplos muestran cómo relacionar la estructura del tensor material considerado en este trabajo con los datos del material.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Universal relations]]></kwd>
<kwd lng="en"><![CDATA[asymptotic homogenization method]]></kwd>
<kwd lng="en"><![CDATA[thermal and electrical conductivity]]></kwd>
<kwd lng="en"><![CDATA[dielectric properties]]></kwd>
<kwd lng="en"><![CDATA[magnetic permeability]]></kwd>
<kwd lng="es"><![CDATA[Relaciones universales]]></kwd>
<kwd lng="es"><![CDATA[método de homogeneización asintótica]]></kwd>
<kwd lng="es"><![CDATA[conductividad térmica y eléctrica]]></kwd>
<kwd lng="es"><![CDATA[propiedades dieléctricas]]></kwd>
<kwd lng="es"><![CDATA[permeabilidad magnética]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Universal relations for three&#45;dimensional thermal, electric and magnetic</b> <b>properties</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>F. J. Sabina* and C. E. Garza&#45;Hume</b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i>Instituto de Investigaciones en Matem&aacute;ticas Aplicadas y en Sistemas, U.N.A.M. Apdo. Post. 20&#45;726, 01000 M&eacute;xico, D.F., M&eacute;xico. * Corresponding author. Tel. (52)(55)5622 3563, fax: (52)(55)5622 3564</i> e&#45;mail: <a href="mailto:fjs@uxmym1.iimas.unam.mx">fjs@uxmym1.iimas.unam.mx</a><a href="mailto:fjs@uxmym1.iimas.unam.mx"></a></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 23 de enero de 2002.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 22 de mayo de 2002.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">A periodic fibre&#45;reinforced two phase material is considered here. The material properties of the constituents are anisotropic and may be specified by either the thermal, electrical conductivity, dielectric or magnetic permeability tensor. The orientation of each of the characteristic directions of the material is not parallel to the axis of geometric symmetry. The asymptotic homogenization method is used to study this doubly periodic composite. The interface between fibres and matrix must conform with the periodicity, but otherwise is arbitrary and may be disjoint in the periodic cell. A connection is found among the solutions of the three local problems that appear in the implementation of the method. This relation is basic for the elementary derivation of three universal relations for this three dimensional scalar problem. Several examples show how to relate the structure of the material tensor considered in this paper to that provided by the material data.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Universal relations; asymptotic homogenization method; thermal and electrical conductivity; dielectric properties; magnetic permeability.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se considera un material peri&oacute;dico de dos fases reforzado por fibras. Las propiedades materiales de las componentes son anis&oacute;tropas y pueden especificarse por el tensor, ya sea t&eacute;rmico, de conductividad el&eacute;ctrica, de permeabilidad diel&eacute;ctrica o magn&eacute;tica. La orientaci&oacute;n de cada una de las direcciones caracter&iacute;sticas del material no es paralela al eje de simetr&iacute;a geom&eacute;trica. Se usa el m&eacute;todo de homogeneizaci&oacute;n asint&oacute;tica para estudiar este compuesto doblemente peri&oacute;dico. La intercara entre fibras y matriz debe cumplir con la periodicidad, pero por lo dem&aacute;s es arbitraria y puede ser disjunta en la celda peri&oacute;dica. Se encuentra una conexi&oacute;n entre las soluciones de los tres problemas locales que aparecen en la instrumentaci&oacute;n del m&eacute;todo. Esta relaci&oacute;n es b&aacute;sica para la derivaci&oacute;n elemental de tres relaciones universales para este problema tridimensional escalar. Varios ejemplos muestran c&oacute;mo relacionar la estructura del tensor material considerado en este trabajo con los datos del material.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Relaciones universales; m&eacute;todo de homogeneizaci&oacute;n asint&oacute;tica; conductividad t&eacute;rmica y el&eacute;ctrica; propiedades diel&eacute;ctricas; permeabilidad magn&eacute;tica.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 65; 75; 77.84.L</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n4/v48n4a9.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Thanks are due to Miss Ana P&eacute;rez Arteaga for computational support. This work was sponsored by CONACyT Project Number 32237&#45;E. Useful discussions with A. Olvera and A.A. Minzoni are gratefully acknowledged.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. A. Bensoussan, J. L. Lions, G. Papanicolau, <i>Asymptotic analysis for periodic structures,</i> (Amsterdam: North&#45;Holland, 1978).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8360546&pid=S0035-001X200200040000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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<body><![CDATA[ ]]></body><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="">
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