<?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>2737-6419</journal-id>
<journal-title><![CDATA[Revista Athenea]]></journal-title>
<abbrev-journal-title><![CDATA[Athenea]]></abbrev-journal-title>
<issn>2737-6419</issn>
<publisher>
<publisher-name><![CDATA[AutanaBooks, con el apoyo institucional de la Universidad Nacional Experimental Politécnica "Antonio José de Sucre", Vicerrectorado Puerto Ordaz, Venezuela]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2737-64192025000100020</article-id>
<article-id pub-id-type="doi">10.47460/athenea.v6i19.88</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A study of the mechanical and electrical properties of the cortical bone based on age, biochemical factors and Nernst equation]]></article-title>
<article-title xml:lang="es"><![CDATA[Un estudio de propiedades mecánicas y eléctricas del hueso cortical a partir de la edad, factores bioquímicos y la ecuación de Nernst]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velez-Cruz]]></surname>
<given-names><![CDATA[Alex J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dam]]></surname>
<given-names><![CDATA[Oscar Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Polytechnic University of Puerto Rico  ]]></institution>
<addr-line><![CDATA[San Juan Puerto Rico]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Experimental Politecnica &#8220;Antonio Jose de Sucre&#8221; Vice-Rectorado Puerto Ordaz ]]></institution>
<addr-line><![CDATA[Ciudad Guayana ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>6</volume>
<numero>19</numero>
<fpage>20</fpage>
<lpage>31</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S2737-64192025000100020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S2737-64192025000100020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S2737-64192025000100020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract. This study presents the development of a mathematical model to assess the performance of oil strings during the drilling process of a reservoir, considering the dynamic conditions and operational characteristics of the equipment during its functions, and taking into account the mechanical properties of API K55 steel. The research resulted in a set of equations that model the behavior of stresses and deformations experienced by the oil tools when transmitting torque, facilitating the opening of the reservoir. A finite element analysis was conducted to evaluate the structural behavior of the strings and to estimate the time required to reach permanent deformations, as well as the time before failure occurs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Este artículo presenta una exploración en profundidad de la intrincada interacción entre las propiedades mecánicas y eléctricas en sistemas biológicos, centrándose en las relaciones experimentales entre el envejecimiento, la concentración de calcio, el pH y la PTH. La ecuación de Nernst es un principio electroquímico fundamental, el cual se examinará por su relevancia en la comprensión de estos fenómenos y su futura aplicación de electroestimulación para procesos de sanación del hueso cortical. El artículo profundiza en el impacto del envejecimiento en el cuerpo humano, el papel del calcio y el pH en los procesos fisiológicos, la importancia de la PTH y la aplicación de la ecuación de Nernst en sistemas biológicos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[aging]]></kwd>
<kwd lng="en"><![CDATA[calcium]]></kwd>
<kwd lng="en"><![CDATA[PTH]]></kwd>
<kwd lng="en"><![CDATA[pH]]></kwd>
<kwd lng="en"><![CDATA[cortical bone]]></kwd>
<kwd lng="en"><![CDATA[Young modulus]]></kwd>
<kwd lng="en"><![CDATA[electrical conductivity]]></kwd>
<kwd lng="en"><![CDATA[Nernst equation and electro-stimulation]]></kwd>
<kwd lng="es"><![CDATA[envejecimiento]]></kwd>
<kwd lng="es"><![CDATA[calcio]]></kwd>
<kwd lng="es"><![CDATA[PTH]]></kwd>
<kwd lng="es"><![CDATA[pH]]></kwd>
<kwd lng="es"><![CDATA[hueso cortical]]></kwd>
<kwd lng="es"><![CDATA[módulo de elasticidad]]></kwd>
<kwd lng="es"><![CDATA[conductividad eléctrica]]></kwd>
<kwd lng="es"><![CDATA[ecuación de Nernst y electroestimulación]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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