<?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>2218-3620</journal-id>
<journal-title><![CDATA[Revista Universidad y Sociedad]]></journal-title>
<abbrev-journal-title><![CDATA[Universidad y Sociedad]]></abbrev-journal-title>
<issn>2218-3620</issn>
<publisher>
<publisher-name><![CDATA[Editorial "Universo Sur"]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2218-36202021000600404</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Emergy analysis the management of rice straw for energy purposes]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis de emergético del manejo de la paja de arroz para usos energéticos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bravo Amarante]]></surname>
<given-names><![CDATA[Edevy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kiran Schulz]]></surname>
<given-names><![CDATA[Ralf]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero Romero]]></surname>
<given-names><![CDATA[Osvaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Bastida]]></surname>
<given-names><![CDATA[Eduardo Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Patricia Güereca]]></surname>
<given-names><![CDATA[Leonor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Sancti Spiritus &#8220;José Martí&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Kassel  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Cienfuegos &#8220;Carlos Rafael Rodríguez&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Tecnológica de La Habana &#8220;José Antonio Echevarría&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autonoma de Mexico  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>13</volume>
<numero>6</numero>
<fpage>404</fpage>
<lpage>420</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2218-36202021000600404&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2218-36202021000600404&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2218-36202021000600404&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The management of crop residues in Cuba has made significant progress; however, it still does not consider the energy potential. In this paper, four alternatives of rice production are evaluated: 1) the basic scenario that is currently used; 2) the production of electricity from the anaerobic digestion of rice straw is delivered to the national electric power system; 3) the electric energy self-sufficiency; and 4) the replace 60% of the diesel fuel by biomethane. Emergy analysis was carried out, which the following indices: the environmental loading ratio (ELR), emergy yield ratio (EYR), emergy investment ratio (EIR), emergy exchange ratio (EER), and the emergy sustainability index (ESI). The values ESI = (6.46, 14.05, 15.67, 24.38) shows that the energy use of rice straw is sustainable in the long term.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El manejo de residuos de cultivos en Cuba ha avanzado significativamente; sin embargo, todavía no considera el potencial energético. En este trabajo se evalúan cuatro alternativas de producción de arroz: 1) el escenario básico que se utiliza actualmente; 2) la producción de electricidad a partir de la digestión anaeróbica de la paja de arroz se entrega al sistema eléctrico nacional; 3) el autoabastecimiento energético; y 4) la sustitución del 60% del combustible diesel por biometano. Se realizó un análisis emergentico de los sistemas propuestos, que baso en la obtención de los siguientes índices: el índice de carga ambiental (ELR), el índice de rendimiento de emergía (EYR), el índice de inversión de emergía (EIR), el coeficiente de intercambio de emergía (EER) y el índice de sostenibilidad de emergía (ESI). Los valores ESI = (6.46, 14.05, 15.67, 24.38) muestran que el uso energético de la paja de arroz es sostenible a largo plazo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Waste]]></kwd>
<kwd lng="en"><![CDATA[rice straw]]></kwd>
<kwd lng="en"><![CDATA[biogas]]></kwd>
<kwd lng="en"><![CDATA[emergy]]></kwd>
<kwd lng="en"><![CDATA[sustainability]]></kwd>
<kwd lng="es"><![CDATA[Desechos]]></kwd>
<kwd lng="es"><![CDATA[paja arroz]]></kwd>
<kwd lng="es"><![CDATA[biogas]]></kwd>
<kwd lng="es"><![CDATA[emergía]]></kwd>
<kwd lng="es"><![CDATA[sostenibilidad]]></kwd>
</kwd-group>
</article-meta>
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