<?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>0122-3461</journal-id>
<journal-title><![CDATA[Ingeniería y Desarrollo]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. Desarro.]]></abbrev-journal-title>
<issn>0122-3461</issn>
<publisher>
<publisher-name><![CDATA[Fundación Universidad del Norte]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-34612020000200382</article-id>
<article-id pub-id-type="doi">10.14482/inde.38.2.624.15</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variabilidad en las densidades, las velocidades del ultrasonido y los módulos dinámicos en tres maderas mexicanas y tres maderas japonesas]]></article-title>
<article-title xml:lang="en"><![CDATA[Variability in Densities, Ultrasound Speeds and Dynamic Modulus in Three Mexican and Three Japanese Woods]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sotomayor Castellanos]]></surname>
<given-names><![CDATA[Javier Ramón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macedo Alquicira]]></surname>
<given-names><![CDATA[Isarael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez García]]></surname>
<given-names><![CDATA[Hugo Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<fpage>382</fpage>
<lpage>399</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-34612020000200382&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-34612020000200382&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-34612020000200382&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La variabilidad en los valores experimentales de la densidad, la velocidad del ultrasonido y el módulo dinámico puede estar asociada al efecto de las propiedades intrínsecas de la madera y ser diferente entre especies y sus direcciones de anisotropía. Para verificar esta hipótesis, el objetivo de la investigación fue determinar estos parámetros en tres maderas mexica nas: Pinus pseudostrobus, Tabebuia rosea y Quercus spp., y en tres maderas japonesas: Paulownia tomentosa, Cryptomeria japonica y Fagus crenata. Se realizaron pruebas de ultrasonido en las direcciones radial, tangencial y longitudinal; igualmente, se determinaron las relaciones de anisotropía y las longitudes de onda. Los valores de las densidades, las velocidades del ultrasonido y los módulos dinámicos para las maderas de P. pseudostrobus, T. rosea, Quercus spp., P. tomentosa, C. japonica y F. crenata presentan una amplia diversidad entre especies y en una especie. Esta variabilidad se puede caracterizar con los coeficientes de variación y de determinación. Las pruebas de ultrasonido son útiles para confirmar el carácter anisotrópico de la velocidad del ultrasonido y del módulo de elasticidad de la madera. Para esto, es suficiente un tamaño de muestra de 35 probetas orientadas en las direcciones radial, tangencial y longitudinal.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The variability in the experimental values of the density, the speed of ultrasound, and the dynamic modulus may be associated with the effect of the intrinsic properties of wood, and they are different between species and their directions of anisotropy. To verify this hypothesis, the objective of the investigation was to determine these parameters in three Mexican woods: Pinus pseudostrobus, Tabebuia rosea, and Quercus spp; and from three Japanese woods: Paulownia tomentosa, Cryptomeria japonica, and Fagus crenata. Ultrasound tests were perfor med in the radial, tangential, and longitudinal directions, and the anisotropy relationships and wavelengths were determined. The values of the densities, the speeds of ultrasound, and the dynamic modules for the woods of P. pseudos trobus, T. rosea, Quercus spp, P. tomentosa, C. japonica, and F. crenata present a wide and diverse range, both inter- and intra-species. This variability can be characterized with the coefficients of variation and determination. Ultrasound tests are useful for confirming the anisotropic character of ultrasound speed and modulus of elasticity of wood. For this, a sample size of 35 specimens oriented in the radial, tangential, and longitudinal directions is sufficient.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[anisotropía]]></kwd>
<kwd lng="es"><![CDATA[coeficiente de determinación]]></kwd>
<kwd lng="es"><![CDATA[coeficiente de variación]]></kwd>
<kwd lng="es"><![CDATA[longitud de onda]]></kwd>
<kwd lng="es"><![CDATA[tamaño de muestra]]></kwd>
<kwd lng="es"><![CDATA[variabilidad en la madera]]></kwd>
<kwd lng="en"><![CDATA[anisotropy]]></kwd>
<kwd lng="en"><![CDATA[coefficient of determination]]></kwd>
<kwd lng="en"><![CDATA[coefficient of variation]]></kwd>
<kwd lng="en"><![CDATA[sample size]]></kwd>
<kwd lng="en"><![CDATA[variability in wood]]></kwd>
<kwd lng="en"><![CDATA[wavelength]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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