<?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>1665-6423</journal-id>
<journal-title><![CDATA[Journal of applied research and technology]]></journal-title>
<abbrev-journal-title><![CDATA[J. appl. res. technol]]></abbrev-journal-title>
<issn>1665-6423</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-64232025000100033</article-id>
<article-id pub-id-type="doi">10.22201/icat.24486736e.2025.23.1.2669</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Acoustic and thermal study of coconut fiber agglomerated with cassava starch]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintero]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieto]]></surname>
<given-names><![CDATA[A. X.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orduña]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marín-Calvo]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Tecnológica de Panamá Facultad Eléctrica Centro Regional de Azuero]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Aplicadas y Tecnología Departamento de Óptica, Microondas y Acústica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Aplicadas y Tecnológica Departamento de Instrumentación Científica e Industrial]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Tecnológica de Panamá Facultad de Ingeniería Mecánica Centro Regional de Azuero]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af5">
<institution><![CDATA[,Centro de Estudios Multidisciplinarios en Ciencias, Ingeniería y Tecnología  ]]></institution>
<addr-line><![CDATA[Panama ]]></addr-line>
<country>Panama</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>23</volume>
<numero>1</numero>
<fpage>33</fpage>
<lpage>44</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-64232025000100033&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-64232025000100033&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-64232025000100033&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In this work, a thermal and acoustic study of specimens made from coconut fibers agglomerated with cassava starch was conducted. Measurement for acoustic characterization were performed in third-octave frequencies bands, between 100 and 5000 Hz (maximum frequency of absorption coefficient). Sound absorption coefficient (&#945;) was measured in a transmission tube according to ISO 10534-2: 2001. Agglomerated coconut fiber with cassava starch material exhibits an acceptable sound absorption coefficient (greater than 0,65) across a wide frequency range (between 1000 and 5000 Hz). In addition, procedures described in ASTM E2611-19 were implemented to determine the sound transmission loss (STL), expressed in decibels (dB). Acceptable STL values for a natural fiber insulator were obtained. Improvements in STL were observed when increasing the thickness from 1,2 to 1,4 cm, at higher frequencies (17,3 dB at 5000 Hz). The results demonstrate the capacity of the tested specimen as a sound absorber, with absorption coefficient greater than 70% for a considerable range of frequencies, starting at 1000 Hz and above. Similarly, the thermal study based on ASTM C-177 indicates an average thermal conductivity coefficient of 0,174 W/m·K, in a range of inlet temperatures between 52°C and 137°C, confirming that it has good insulation properties, although still not comparable to some industrial materials.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Biomaterial]]></kwd>
<kwd lng="en"><![CDATA[coconut fiber]]></kwd>
<kwd lng="en"><![CDATA[waste resources]]></kwd>
<kwd lng="en"><![CDATA[acoustic conditioning]]></kwd>
<kwd lng="en"><![CDATA[sound insulation]]></kwd>
<kwd lng="en"><![CDATA[thermal insulation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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