<?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>S0035-001X2006000300006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio de campos locales residuales mediante relaxometría magnética nuclear en el sistema rotante]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perlo]]></surname>
<given-names><![CDATA[Josefina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anoardo]]></surname>
<given-names><![CDATA[Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Córdoba y CONICET Facultad de Matemática, Astronomía y Física ]]></institution>
<addr-line><![CDATA[Córdoba ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Córdoba y CONICET Facultad de Matemática, Astronomía y Física ]]></institution>
<addr-line><![CDATA[Córdoba ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<numero>3</numero>
<fpage>230</fpage>
<lpage>237</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2006000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2006000300006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2006000300006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presentan avances del estudio de una técnica experimental de resonancia magnética nuclear en el sistema rotante. Esta técnica, basada en el experimento de anclaje de espín, permite obtener informacion sobre la magnitud de los campos locales residuales en materiales con organización molecular. La magnetización, luego de un cierto tiempo de anclaje, es estudiada en función de la atenuación del campo de radiofrecuencia. La curva de dispersión obtenida, en un intervalo desde unos pocos kHz hasta aproximadamente 50 kHz, contiene información de la componente residual del campo local a lo largo de la dirección establecida por el campo magnético externo. El análisis de los resultados arroja valores consistentes y comparables con aquéllos obtenidos mediante otros métodos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present advances on the study of a nuclear magnetic resonance technique in the rotating frame. The method, based on the spin-lock experiment, allows to get information on the residual local fields in molecular organized materials. The magnetization after a certain lock-time is studied as a function of the radio-frequency field atenuation. The obtained dispersion curve, within a frequency interval ranging from a few kHz to about 50 kHz, contains information about the residual local field along the external magnetic field. The interpretation of the results is consistent and comparable with those obtained by other methods.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Nemático]]></kwd>
<kwd lng="es"><![CDATA[campo local residual]]></kwd>
<kwd lng="es"><![CDATA[relaxometría]]></kwd>
<kwd lng="es"><![CDATA[sistema rotante]]></kwd>
<kwd lng="en"><![CDATA[Nematic]]></kwd>
<kwd lng="en"><![CDATA[residual local field]]></kwd>
<kwd lng="en"><![CDATA[relaxometry]]></kwd>
<kwd lng="en"><![CDATA[rotating frame]]></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="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Estudio de campos locales residuales mediante relaxometr&iacute;a magn&eacute;tica nuclear en el sistema rotante</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Josefina Perlo*, Esteban Anoardo**</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Facultad de Matem&aacute;tica, Astronom&iacute;a y F&iacute;sica, Universidad Nacional de C&oacute;rdoba y CONICET, </i><i>X5016LAE C&oacute;rdoba, Argentina, e&#150;mail: <a href="mailto:pj@famaf.unc.edu.ar">pj@famaf.unc.edu.ar</a></i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Facultad de Matem&aacute;tica, Astronom&iacute;a y F&iacute;sica, Universidad Nacional de C&oacute;rdoba y CONICET, </i><i>X5016LAE C&oacute;rdoba, Argentina, e&#150;mail: <a href="mailto:anoardo@famaf.unc.edu.ar">anoardo@famaf.unc.edu.ar</a></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 5 de enero de 2006    ]]></body>
<body><![CDATA[<br>   Aceptado el 17 de febrero de 2006</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">Se presentan avances del estudio de una t&eacute;cnica experimental de resonancia magn&eacute;tica nuclear en el sistema rotante. Esta t&eacute;cnica, basada en el experimento de anclaje de esp&iacute;n, permite obtener informacion sobre la magnitud de los campos locales residuales en materiales con organizaci&oacute;n molecular. La magnetizaci&oacute;n, luego de un cierto tiempo de anclaje, es estudiada en funci&oacute;n de la atenuaci&oacute;n del campo de radiofrecuencia. La curva de dispersi&oacute;n obtenida, en un intervalo desde unos pocos kHz hasta aproximadamente 50 kHz, contiene informaci&oacute;n de la componente residual del campo local a lo largo de la direcci&oacute;n establecida por el campo magn&eacute;tico externo. El an&aacute;lisis de los resultados arroja valores consistentes y comparables con aqu&eacute;llos obtenidos mediante otros m&eacute;todos.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Nem&aacute;tico; campo local residual; relaxometr&iacute;a; sistema rotante.</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">We present advances on the study of a nuclear magnetic resonance technique in the rotating frame. The method, based on the spin&#150;lock experiment, allows to get information on the residual local fields in molecular organized materials. The magnetization after a certain lock&#150;time is studied as a function of the radio&#150;frequency field atenuation. The obtained dispersion curve, within a frequency interval ranging from a few kHz to about 50 kHz, contains information about the residual local field along the external magnetic field. The interpretation of the results is consistent and comparable with those obtained by other methods.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Nematic; residual local field; relaxometry; rotating frame.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 76.60&#150;k; 76.70.&#150;r; 82.56.&#150;b</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/v52n3/v52n3a6.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>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Se agradece apoyo economico de CONICET, Secyt&#150;UNC y Fundacion Antorchas. Parte del equipamiento utilizado fue donado por la empresa italiana Stelar srl y el laboratorio de resonancia magnetica de la Universidad de Ulm (Alemania).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. C.P. Slichter, <i>Principles of Magnetic Resonance </i>(Springer Verlag, Berlin, 1978).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8318463&pid=S0035-001X200600030000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. R. Kimmich y E. Anoardo, <i>Prog. Nucl. Magn. Reson. 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