<?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>S0035-001X2011000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Desarrollo de celdas lógicas por medio del espacio de estados en un sistema bidimensional]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Cantón]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Facultad de ciencias ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>2</numero>
<fpage>117</fpage>
<lpage>124</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Este artículo presenta la construcción de las celdas lógicas básicas OR y AND en un sistema bidimensional por medio del espacio de estados. Se analiza el caso particular de un sistema lineal estable con valores propios distintos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This work shows the construction of the basic logic OR and AND gates in a bidimensional system with the use of the state space. The particular case of a stable linear system with distinct eigenvalues is analyzed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Retrato de fase]]></kwd>
<kwd lng="es"><![CDATA[electrónica analógica]]></kwd>
<kwd lng="es"><![CDATA[ecuaciones diferenciales ordinarias]]></kwd>
<kwd lng="en"><![CDATA[Linear functions]]></kwd>
<kwd lng="en"><![CDATA[phase portrait]]></kwd>
<kwd lng="en"><![CDATA[differential equations]]></kwd>
<kwd lng="en"><![CDATA[logic gates]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Carta</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Desarrollo de celdas l&oacute;gicas por medio del espacio de estados en un sistema bidimensional</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>I. Campos&#150;Cant&oacute;n</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 ciencias, Universidad Aut&oacute;noma de San Luis Potos&iacute;, Alvaro Obreg&oacute;n 64, San Luis Potos&iacute;, 78000, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 8 de noviembre de 2010    <br> Aceptado el 11 de enero de 2011</font></p>     ]]></body>
<body><![CDATA[<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">Este art&iacute;culo presenta la construcci&oacute;n de las celdas l&oacute;gicas b&aacute;sicas OR y AND en un sistema bidimensional por medio del espacio de estados. Se analiza el caso particular de un sistema lineal estable con valores propios distintos.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Retrato de fase; electr&oacute;nica anal&oacute;gica; ecuaciones diferenciales ordinarias.</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">This work shows the construction of the basic logic OR and AND gates in a bidimensional system with the use of the state space. The particular case of a stable linear system with distinct eigenvalues is analyzed.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Linear functions; phase portrait; differential equations; logic gates.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 02.10.Yn; 02.60.Lj; 02.10.Ab; 84.30.Sk</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v57n2/v57n2a2.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>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. S. Sinha y W. Ditto, <i>Phys. Rev. Lett. </i><b>81</b> (1998) 2156.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367259&pid=S0035-001X201100020000200001&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. D. Kuo, <i>IEEE Potentials </i><b>24</b> (2005) 13.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367261&pid=S0035-001X201100020000200002&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. S. Sinha y W. Ditto, <i>Phys. Rev. E </i><b>60</b> (1999) 363.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367263&pid=S0035-001X201100020000200003&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. T. Munakata, S. Sinha y W. Ditto, <i>IEEE Trans. Circuits Syst. I: Fundam. Theory Appl. </i><b>49</b> (2002) 1629.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367265&pid=S0035-001X201100020000200004&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. I. Campos&#150;Cant&oacute;n, E. Campos&#150;Cant&oacute;n, J.A. Pecina&#150;Sanchez y H.C. Rosu, <i>Int. J. Bif. andChaos </i><b>20</b> (2010) 2547; to appear.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367267&pid=S0035-001X201100020000200005&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. K. Murali, S. Sinha, W.L. Ditto y A.R. Bulsara, <i>Phys. Rev. Lett. </i><b>102</b>(2009)104101.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367269&pid=S0035-001X201100020000200006&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">7. K. Murali, A. Miliotis, W.L. Ditto y S. Sinha, <i>Phys. Lett. A </i><b>373</b> (2009) 1346.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367271&pid=S0035-001X201100020000200007&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">8. K. Murali, S. Sinha y I.R. Mohamed, <i>Phys. Lett. A </i><b>339</b> (2005) 39.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367273&pid=S0035-001X201100020000200008&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">9. K. Murali, S. Sinha y W.L. Ditto, <i>Int. J. Bif. and Chaos </i><b>13</b> (2003) 2669.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367275&pid=S0035-001X201100020000200009&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">10. H. Peng, Y. Yang, L. Li y H. Luo, <i>Chaos </i><b>18</b> (2008) 033101.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367277&pid=S0035-001X201100020000200010&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">11. I.  Campos&#150;Cant&oacute;n,   S.  Tesheira,  C.  Jim&eacute;nez&#150;Calvillo y  E. Campos&#150;Cant&oacute;n, <i>Rev. Mex. F&iacute;s. </i><b>54</b> (2008) 468.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8367279&pid=S0035-001X201100020000200011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
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