<?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>2310-3469</journal-id>
<journal-title><![CDATA[Revista Cubana de Ciencias Forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev cubana ciencias forestales]]></abbrev-journal-title>
<issn>2310-3469</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Pinar del Río Hermanos Saíz Montes de Oca]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2310-34692020000100176</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Densidad y módulo dinámico de tres maderas mexicanas impregnadas con boro. Evaluación con vibraciones transversales]]></article-title>
<article-title xml:lang="pt"><![CDATA[Densidade e módulo dinâmico de três madeiras mexicanas impregnadas com boro Avaliação com vibrações transversais]]></article-title>
<article-title xml:lang="en"><![CDATA[Density and dynamic modulus of three mexican woods impregnated with boron. Evaluation with transverse vibrations]]></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[Ávila Calderón]]></surname>
<given-names><![CDATA[Luz Elena Alfonsina]]></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>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2020</year>
</pub-date>
<volume>8</volume>
<numero>1</numero>
<fpage>176</fpage>
<lpage>190</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2310-34692020000100176&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2310-34692020000100176&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2310-34692020000100176&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este trabajo fue evaluar los efectos de las sales de boro en las densidades y en los módulos dinámicos de la madera. Para ello, se trataron cuarenta probetas de Spathodea campanulata, Fraxinus americana y Albizia plurijuga mediante el método de baño caliente-frío en tres grupos con concentraciones de 1 %, 2 %, 3 %, más un grupo de control. Antes y después del tratamiento, se calcularon las densidades de la madera, el contenido de humedad, sus retenciones y se determinaron sus módulos dinámicos con vibraciones transversales. Los valores de las retenciones aumentaron proporcionalmente a la concentración de sales de boro utilizada, pero disminuyeron a medida que las densidades de cada especie variaron. El tratamiento en probetas de pequeñas dimensiones no alteró las densidades de la madera. En cambio, el tratamiento sí modificó los módulos dinámicos determinados con vibraciones transversales. Se confirmó el paradigma en ciencias de la madera que propone la caracterización del comportamiento mecánico de cada especie en particular. Las experiencias se realizaron en el laboratorio de Mecánica de la Madera de la Facultad de ingeniería en Tecnología de la Madera de la Universidad Michoacana de San Nicolás de Hidalgo, en Morelia, México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo O objetivo deste trabalho foi avaliar os efeitos dos sais de boro sobre as densidades e módulos dinâmicos da madeira. Para este fim, quarenta espécimes de Spathodea campanulata, Fraxinus americana e Albizia plurijuga foram tratados pelo método de banho quente-frio em três grupos com concentrações de 1 %, 2 %, 3 %, mais um grupo de controlo. Antes e depois do tratamento, foram calculadas as densidades da madeira, o teor de humidade, as suas retenções e os seus módulos dinâmicos com vibrações transversais. Os valores das retenções aumentaram proporcionalmente à concentração de sais de boro utilizados, mas diminuíram à medida que as densidades de cada espécie variaram. O tratamento em pequenos exemplares não alterou as densidades da madeira. No entanto, o tratamento modificou os módulos dinâmicos determinados com vibrações transversais. Foi confirmado o paradigma nas ciências da madeira que propõe a caracterização do comportamento mecânico de cada espécie em particular. As experiências foram realizadas no Laboratório de Mecânica da Madeira da Faculdade de Engenharia Tecnológica da Madeira da Universidade Michoacana de San Nicolás de Hidalgo, em Morelia, México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this work was to evaluate the effects of boron salts on the physical-mechanical properties of wood. For this, forty specimens of Spathodea campanulata, Fraxinus americana and Albizia plurijuga were treated using the hot-cold bath method in three groups with concentrations of 1 %, 2 %, 3 %, plus a control group. Before and after the treatment, the densities of the wood, the moisture content, its retentions were calculated and its dynamic modules were determined with transverse vibrations. Retention values increased proportionally to the concentration of boron salts used, but decreased as the densities of each species varied. The treatment in small specimens did not alter the densities of the wood. In contrast, the treatment did modify the dynamic modules determined with transverse vibrations. The paradigm in wood sciences that proposes the characterization of the mechanical behavior of each particular species was confirmed. The experiences were carried out in the Wood Mechanics Laboratory of the Faculty of Engineering in Wood Technology of the Michoacana University of San Nicolás de Hidalgo, in Morelia, Mexico.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Albizia plurijuga]]></kwd>
<kwd lng="es"><![CDATA[baño caliente-frío]]></kwd>
<kwd lng="es"><![CDATA[Fraxinus americana]]></kwd>
<kwd lng="es"><![CDATA[retención de sales de boro]]></kwd>
<kwd lng="es"><![CDATA[Spathodea campanulata.]]></kwd>
<kwd lng="pt"><![CDATA[Albizia plurijuga]]></kwd>
<kwd lng="pt"><![CDATA[banho quente-frio]]></kwd>
<kwd lng="pt"><![CDATA[Fraxinus americana]]></kwd>
<kwd lng="pt"><![CDATA[retenção de sais de boro]]></kwd>
<kwd lng="pt"><![CDATA[Spathodea campanulata.]]></kwd>
<kwd lng="en"><![CDATA[Albizia plurijuga]]></kwd>
<kwd lng="en"><![CDATA[boron salt retention]]></kwd>
<kwd lng="en"><![CDATA[Fraxinus americana]]></kwd>
<kwd lng="en"><![CDATA[hot-cold bath]]></kwd>
<kwd lng="en"><![CDATA[Spathodea campanulata.]]></kwd>
</kwd-group>
</article-meta>
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