<?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>S0035-001X2003000400009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Hamiltonian structures for the acoustic field]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres del Castillo]]></surname>
<given-names><![CDATA[G.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo Linares]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Instituto de Ciencias Departamento de Física Matemática]]></institution>
<addr-line><![CDATA[Puebla ]]></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>08</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2003</year>
</pub-date>
<volume>49</volume>
<numero>4</numero>
<fpage>344</fpage>
<lpage>347</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2003000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2003000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2003000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[It is shown that the Hamiltonian structures for the acoustic field obtained by means of the canonical formalism using as field variables the components of the molecular displacements or the variation of the gas density are different and lead to different Poisson brackets. It is shown that by requiring that the values of the Hamiltonians coincide, the Poisson brackets also coincide.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se muestra que las estructuras hamiltonianas para el campo acústico que se obtienen a través del formalismo canónico usando como variables de campo las componentes de los desplazamientos moleculares o la variación de la densidad del gas son diferentes y llevan a paréntesis de Poisson diferentes. Se muestra que si se propone que los valores de las hamiltonianas coincidan, entonces los paréntesis de Poisson también coinciden.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Acoustic field]]></kwd>
<kwd lng="en"><![CDATA[Hamiltonian structures]]></kwd>
<kwd lng="es"><![CDATA[Campo acústico]]></kwd>
<kwd lng="es"><![CDATA[estructuras hamiltonianas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify">&nbsp;</p>      <p align="center"><font face="verdana" size="4"><b>Hamiltonian structures for the acoustic field</b></font></p>      <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="2"><b>G.F. Torres del Castillo<sup>1</sup>, E. Galindo Linares<sup>2</sup></b></font></p>       <p align="center">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Departamento de F&iacute;sica Matem&aacute;tica, Instituto de Ciencias, Universidad Aut&oacute;noma de Puebla,</i> <i>72570 Puebla, Pue., M&eacute;xico</i></font></p>      <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Facultad de Ciencias F&iacute;sico Matem&aacute;ticas, Universidad Aut&oacute;noma de Puebla, Apartado Postal 1152, 72001 Puebla, Pue., M&eacute;xico</i></font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2">Recibido el 10 de diciembre de 2002.     ]]></body>
<body><![CDATA[<br>   Aceptado el 25 de febrero de 2003.</font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>      <p align="justify"><font face="verdana" size="2">It is shown that the Hamiltonian structures for the acoustic field obtained by means of the canonical formalism using as field variables the components of the molecular displacements or the variation of the gas density are different and lead to different Poisson brackets. It is shown that by requiring that the values of the Hamiltonians coincide, the Poisson brackets also coincide.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Acoustic field; Hamiltonian structures.</font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>      <p align="justify"><font face="verdana" size="2">Se muestra que las estructuras hamiltonianas para el campo ac&uacute;stico que se obtienen a trav&eacute;s del formalismo can&oacute;nico usando como variables de campo las componentes de los desplazamientos moleculares o la variaci&oacute;n de la densidad del gas son diferentes y llevan a par&eacute;ntesis de Poisson diferentes. Se muestra que si se propone que los valores de las hamiltonianas coincidan, entonces los par&eacute;ntesis de Poisson tambi&eacute;n coinciden.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Campo ac&uacute;stico; estructuras hamiltonianas.</font></p>      <p align="justify"><font face="verdana" size="2">PACS: 11.10.Ef;03.50.&#45;z;43.20.+g</font></p>      ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v49n4/v49n4a9.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>      <p align="justify">&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. P. J. Olver, <i>Applications</i> <i>of</i> <i>Lie Groups to Differential Equations</i> (Springer&#45;Verlag, New York, 1986), Chap. 7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8296362&pid=S0035-001X200300040000900001&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. G.F. Torres del Castillo, <i>Rev. Mex. F&iacute;s.</i> 37 (1991) 165.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8296364&pid=S0035-001X200300040000900002&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">3. G.F. Torres del Castillo and N. Bagatella Flores, <i>Rev. Mex. F&iacute;s.</i> 40 (1994) 209.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8296366&pid=S0035-001X200300040000900003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">4. H. Goldstein, <i>Classical Mechanics,</i> 2nd ed. (Addison&#45;Wesley, Reading, Mass., 1980), Chap. 12.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8296368&pid=S0035-001X200300040000900004&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">5. D. ter Haar, <i>Elements</i> <i>of</i> <i>Hamiltonian Mechanics,</i> 2nd ed. (Pergamon, Oxford, 1971), Chap. 8.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8296370&pid=S0035-001X200300040000900005&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">6. G.F. Torres del Castillo and D. Acosta Avalos, <i>Rev. Mex. F&iacute;s.</i> 40 (1994) 405.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8296372&pid=S0035-001X200300040000900006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
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