<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342016000300493</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Características aerodinámicas de mallas anti-insectos usadas en ventanas de invernaderos en México]]></article-title>
<article-title xml:lang="en"><![CDATA[Aerodynamic characteristics of anti-insect mesh windows used in greenhouses in Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Vega]]></surname>
<given-names><![CDATA[Cuauhtémoc]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Arias]]></surname>
<given-names><![CDATA[José Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Cruz]]></surname>
<given-names><![CDATA[Irineo L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Postgrado en Ingeniería Agrícola y Uso Integral del Agua ]]></institution>
<addr-line><![CDATA[Chapingo, Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>3</numero>
<fpage>493</fpage>
<lpage>506</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342016000300493&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342016000300493&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342016000300493&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se analizaron mediante pruebas de microscopía y en túnel de viento, las características geométricas, porosidad y la caída de presión, respectivamente de siete diferentes mallas comúnmente usadas como barreras físicas en ventanas de invernaderos mexicanos para determinar su efecto sobre la tasa de ventilación, la permeabilidad y el factor inercial. Las mallas se analizaron en la Universidad Autónoma Chapingo en mayo de 2013 y fueron: anti-trips (M1), anti-trips bicolor (M2), anti-áfidos (M3), anti-áfidos bicolor (M4), cenital (M5), rompevientos verde-negro (M6) y anti-áfidos blanca (M7), cuyas porosidades fueron 0.36, 0.35, 0.47, 0.45, 0.54, 0.29 y 0.43 respectivamente. La geometría de las mallas se realizó midiendo las áreas de los poros con un microscopio óptico, para determinar las porosidades y calcular el descenso de la tasa de ventilación. Posteriormente, las características aerodinámicas más importantes; es decir, permeabilidad y factor inercial, se determinaron usando un túnel de viento para medir la relación entre la caída de presión causada por cada malla y la velocidad del flujo de aire. Los resultados mostraron que la malla cenital (M5) presenta la menor resistencia al flujo de aire con 21% de descenso en la tasa de ventilación, mientras que la malla rompevientos verde-negra (M6) fue de 50%. Los invernaderos en México normalmente usan la malla del tipo anti-áfidos con porosidad entre 0.43 y 0.47 para las ventanas laterales y cenitales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract They were analyzed by tests microscopy and wind tunnel, geometric characteristics, porosity and pressure drop, respectively seven different meshes commonly used as physical barriers windowing Mexican greenhouses to determine its effect on the ventilation rate, permeability and the inertial factor. The meshes were analyzed in the Chapingo in May 2013 were: anti-thrips (M1), anti- thrips bicolor (M2), anti-aphid (M3), anti-aphid bicolor (M4), zenithal (M5), green-black windbreaker (M6) and anti-aphid white (M7), whose porosities were 0.36, 0.35, 0.47, 0.45, 0.54, 0.29 and 0.43 respectively. The geometry of the meshes is performed by measuring the areas of the pores with an optical microscope to determine the porosities and calculate the decrease in ventilation rate. Subsequently, the most important aerodynamic characteristics; i. e. inertial factor and permeability were determined using a wind tunnel to measure the relationship between the pressure drop caused by each mesh and the speed of the airf low. The results showed that the zenithal mesh (M5) has the least resistance to air flow with 21% decrease in ventilation rate, while the green- black windbreaker mesh (M6) was 50%. Greenhouses in Mexico typically use anti-aphid mesh with porosity between 0.43 and 0.47 for the side windows and zenithal type.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[caída de presión]]></kwd>
<kwd lng="es"><![CDATA[factor inercial]]></kwd>
<kwd lng="es"><![CDATA[permeabilidad]]></kwd>
<kwd lng="es"><![CDATA[porosidad]]></kwd>
<kwd lng="en"><![CDATA[inertial factor]]></kwd>
<kwd lng="en"><![CDATA[permeability]]></kwd>
<kwd lng="en"><![CDATA[porosity]]></kwd>
<kwd lng="en"><![CDATA[pressure drop]]></kwd>
</kwd-group>
</article-meta>
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