<?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>0120-419X</journal-id>
<journal-title><![CDATA[Revista Integración]]></journal-title>
<abbrev-journal-title><![CDATA[Integración - UIS]]></abbrev-journal-title>
<issn>0120-419X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-419X2012000200006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Solución analítica del problema directo de la tomografía de capacitancia eléctrica para un fluido bifásico con una inclusión circular]]></article-title>
<article-title xml:lang="en"><![CDATA[Analytical solution of the direct problem of electrical capacitance tomography for two-phase fluid with a circular inclusion]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[REYES]]></surname>
<given-names><![CDATA[SILVIA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FRAGUELA]]></surname>
<given-names><![CDATA[ANDRÉS]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[CRUZ]]></surname>
<given-names><![CDATA[VÍCTOR A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ROMANO]]></surname>
<given-names><![CDATA[EMMANUEL A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Tecnológica de la Mixteca Instituto de Física y Matemáticas ]]></institution>
<addr-line><![CDATA[Oaxaca ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Ciencias Físico-Matemáticas ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<fpage>227</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-419X2012000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-419X2012000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-419X2012000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen. En este artículo se expone un modelo matemático al problema de la Tomografía de Capacitancia Eléctrica (TCE), para el caso de un fluido bifásico dieléctrico con una inclusión circular. Se resuelve el problema directo, que consiste en obtener una expresión analítica para las capacitancias mutuas. La solución del problema directo servirá para validar cualquier método de solución al problema inverso, para calibrar los equipos de medición actualmente existentes y además para construir un método de discretización adaptiva para resolver el problema inverso de la TCE.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract.In this article is disclosed a mathematical model to the problem of Electrical Capacitance Tomography (ECT), for the case of a dielectric biphasic fluid with a circular inclusion. We solve the direct problem, which consists in obtaining an analytic expression for the mutual capacitances. The solution of the direct problem will serve to validate any method of inverse problem solution, to calibrate the existing measurement equipment and also to build an adaptive discretization method to solve the inverse problem of the ECT.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Problema directo]]></kwd>
<kwd lng="es"><![CDATA[problema inverso]]></kwd>
<kwd lng="es"><![CDATA[tomografía de capacitancia eléctrica]]></kwd>
<kwd lng="en"><![CDATA[Direct problem]]></kwd>
<kwd lng="en"><![CDATA[inverse problem]]></kwd>
<kwd lng="en"><![CDATA[electrical capacitance tomography]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">     <p align="center"><font size="4"><b><i>Soluci&oacute;n anal&iacute;tica del problema directo de la    <br> tomograf&iacute;a de capacitancia el&eacute;ctrica para un    <br> fluido bif&aacute;sico con una inclusi&oacute;n circular</i></b></font></p>      <p align="center">SILVIA REYES<sup>a *</sup>, ANDR&Eacute;S FRAGUELA<sup>b</sup>, V&Iacute;CTOR A. CRUZ<sup>a</sup>,    <br>EMMANUEL A. ROMANO<sup>b</sup></p>     <p align="center"><sup>a</sup> Universidad Tecnol&oacute;gica de la Mixteca, Instituto de F&iacute;sica y Matem&aacute;ticas, C. P. 69000, Huajuapan de Le&oacute;n, Oaxaca, M&eacute;xico.    <br> <sup>b</sup> Benem&eacute;rita Universidad Aut&oacute;noma de Puebla, Facultad de Ciencias F&iacute;sico-Matem&aacute;ticas, C. P. 72570, Puebla, M&eacute;xico.</p> <hr>     <p align="justify"><b><i>Resumen.</i></b> En este art&iacute;culo se expone un modelo matem&aacute;tico al problema de la Tomograf&iacute;a de Capacitancia El&eacute;ctrica (TCE), para el caso de un fluido bif&aacute;sico diel&eacute;ctrico con una inclusi&oacute;n circular. Se resuelve el problema directo, que consiste en obtener una expresi&oacute;n anal&iacute;tica para las capacitancias mutuas. La soluci&oacute;n del problema directo servir&aacute; para validar cualquier m&eacute;todo de soluci&oacute;n al problema inverso, para calibrar los equipos de medici&oacute;n actualmente existentes y adem&aacute;s para construir un m&eacute;todo de discretizaci&oacute;n adaptiva para resolver el problema inverso de la TCE.</p> 	     <p align="left"><b><i>Palabras Claves:</i></b> Problema directo, problema inverso, tomograf&iacute;a de capacitancia el&eacute;ctrica.    ]]></body>
<body><![CDATA[<br> <b>MSC2010:</b> 35R30, 35R06, 35R05 <hr>     <p align="center"><font size="3"><b><i>Analytical solution of the direct problem of electrical    <br> capacitance tomography for two-phase fluid with a    <br> circular inclusion</i></b></font></p>      <p align="justify"><b><i>Abstract</i></b>.In this article is disclosed a mathematical model to the problem of Electrical Capacitance Tomography (ECT), for the case of a dielectric biphasic fluid with a circular inclusion. We solve the direct problem, which consists in obtaining an analytic expression for the mutual capacitances. The solution of the direct problem will serve to validate any method of inverse problem solution, to calibrate the existing measurement equipment and also to build an adaptive discretization method to solve the inverse problem of the ECT.</p> 	     <p align="left"><b><i>Keywords:</i></b> Direct problem, inverse problem, electrical capacitance tomography.</p> <hr>     <p align="justify">Texto Completo disponible en <a href ="pdf\rein\v30n2\v30n2a06.pdf">PDF</a></p> <hr>     <p align="left"><font size="3"><b><i>Referencias</i></b></font></p>      <!-- ref --><p align="justify">&#91;1&#93; Fraguela A., Oliveros J., Cervantes L., Mor&iacute;n M. y G&oacute;mez S., &quot;Un algoritmo no iterativo para la tomograf&iacute;a de capacitancia el&eacute;ctrica&quot;, <i>Revista Mexicana de F&iacute;sica</i> 51 (2005), no. 3, 236–242.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000021&pid=S0120-419X201200020000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
<body><![CDATA[<!-- ref --><p align="justify">&#91;2&#93; Williams R.A. and Beck M.S., <i>Process Tomography: Principles,</i> Techniques and Applications, Butterworth Heinemann, Oxford, 1995.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000023&pid=S0120-419X201200020000600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">&#91;3&#93; Fraguela A., G&oacute;mez S. and Oliveros J., &quot;A new method for the solution of the inverse problem of electrical capacitance tomography and its application to image reconstruction of multiphase flows&quot;, in <i>Proceedings of the 5th International Conference on Inverse Problems in Engineering: Theory and Practice</i> Cambridge, UK (2005), 1–11.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000025&pid=S0120-419X201200020000600003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">&#91;4&#93; Kallinderis E., &quot;Adaptive hybrid grid methods&quot;, <i>Computer methods in Applied Mechanics and Engineering</i> 189 (2000), 1231–1245.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000027&pid=S0120-419X201200020000600004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">&#91;5&#93; Shaofan L. and Wing Kam L., <i>Meshfree Particle Methods,</i> Springer-Verlag, Heidelberg, 2004.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000029&pid=S0120-419X201200020000600005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">&#91;6&#93; Thompson M.W. and Soni B., <i>Handbook of grid generation,</i> CRC Press, Boca Raton, 1999.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000031&pid=S0120-419X201200020000600006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
<body><![CDATA[<!-- ref --><p align="justify">&#91;7&#93; Zhao J., Fu W., Li T. and Wang S., &quot;An image reconstruction algorithm based on a revised regularization method for electrical capacitance tomography&quot;, <i>Meas. Sci.Technol.</i> 13 (2002), 638–640.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000033&pid=S0120-419X201200020000600007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">&#91;8&#93; Gamio J.C., &quot;A comparative analysis of single and multiple electrode excitation methods in electrical capacitance tomography&quot;, <i>Meas. Sci.Technol.</i> 13 (2002), 1799–1809.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000035&pid=S0120-419X201200020000600008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">&#91;9&#93; Gamio J.C., Yang Q.W. and Stott A.L., &quot;Analysis of nonideal characteristics of an ac-based capacitance transducter for tomography&quot;, <i>Meas. Sci.Technol.</i> 12 (2001), 1076–1082.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000037&pid=S0120-419X201200020000600009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>  <hr>     <p align="justify"><sup>*</sup>Autor para correspondencia: <i>E-mail:</i> <a href="mailto:sreyes@mixteco.utm.mx">sreyes@mixteco.utm.mx</a>    <br> <b>Recibido:</b> 14 de septiembre de 2012, <b>Aceptado:</b> 25 de octubre de 2012.</p> </font>      ]]></body><back>
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