<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322018000400181</article-id>
<article-id pub-id-type="doi">10.29298/rmcf.v8i48.150</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Características dinámicas de 22 maderas determinadas por el método de vibraciones transversales]]></article-title>
<article-title xml:lang="en"><![CDATA[Dynamic characteristics of 22 woods determined by the tranverse vibration method]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Ingeniería en Tecnología de la Madera ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>9</volume>
<numero>48</numero>
<fpage>181</fpage>
<lpage>202</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322018000400181&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322018000400181&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322018000400181&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La industria de la madera requiere información sobre las características tecnológicas del material para que se les incorpore a nuevos productos con valor agregado. El objetivo de la investigación que se describe fue determinar la densidad, el módulo dinámico, el módulo de rigidez y el coeficiente de amortiguamiento de 22 especies. De cada una se prepararon 20 probetas y se realizaron pruebas de vibraciones en condiciones de apoyo libre-libre. Se calcularon el módulo de dinámico, el módulo de rigidez y el coeficiente de amortiguamiento. Para cada variable se calculó la media, desviación estándar y coeficiente de variación. La especie se consideró el factor de variación. Se obtuvieron las regresiones lineales para un nivel de significancia de 95 % y los coeficientes de determinación de las variables en función de la densidad. Cada taxon presentó características dinámicas diferentes, lo que permitió observar el amplio intervalo de valores que se pueden presentar entre diferentes taxa. La densidad se distribuyó en un intervalo amplio con un mínimo de 391 kg m-3 (Gyrocarpus americanus) y un máximo de 1 096 kg m-3 (Tabebuia chrysantha). Y se mostró como un buen predictor tanto del módulo dinámico (R2 = 0.86), como del módulo de rigidez (R2 = 0.79). No se registró una correlación significativa del coeficiente de amortiguamiento con la densidad (R2 = 0.01).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The timber industry requires information on the technological characteristics of the material so that they are incorporated in new products with added value. The aim of the research was to determine the density, dynamic modulus, modulus of rigidity and damping ratio of 22 species. For each species, 20 specimens were prepared and vibration tests were conducted under free-free condition support. Dynamic modulus, modulus of rigidity and the damping coefficient were assessed. For each variable the mean, standard deviation and coefficient of variation were calculated. Linear regressions were calculated for a significance level of 95 % and their coefficients of determination of the variables as a function of density. Each species showed different dynamic characteristics, which allowed to observe the wide range of values that can be found between different species. The density values are distributed among a minimum of 391 kg m-3 (Gyrocarpus americanus) and a maximum of 1 096 kg m-3 (Tabebuia chrysantha), which allowed to examine a wide interval of densities. The density was found to be a good predictor of dynamic modulus (R2 = 0.86) and modulus of rigidity (R2 = 0.79). No significant correlation of damping ratio with density was found (R2 = 0.01).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Características tecnológicas]]></kwd>
<kwd lng="es"><![CDATA[coeficiente de amortiguamiento]]></kwd>
<kwd lng="es"><![CDATA[densidad de la madera]]></kwd>
<kwd lng="es"><![CDATA[módulo de rigidez]]></kwd>
<kwd lng="es"><![CDATA[módulo dinámico]]></kwd>
<kwd lng="es"><![CDATA[probetas]]></kwd>
<kwd lng="en"><![CDATA[Technological characteristics]]></kwd>
<kwd lng="en"><![CDATA[damping coefficient]]></kwd>
<kwd lng="en"><![CDATA[wood density]]></kwd>
<kwd lng="en"><![CDATA[modulus of rigidity]]></kwd>
<kwd lng="en"><![CDATA[dynamic modulus]]></kwd>
<kwd lng="en"><![CDATA[specimens]]></kwd>
</kwd-group>
</article-meta>
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<article-title xml:lang=""><![CDATA[Measurement of the shear modulus of wood by asymmetric four-point bending tests]]></article-title>
<source><![CDATA[Journal of Wood Science]]></source>
<year>2002</year>
<volume>48</volume>
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