<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282022000200022</article-id>
<article-id pub-id-type="doi">10.19136/era.a9n2.3278</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Aforo de corrientes naturales desde puentes pilotados]]></article-title>
<article-title xml:lang="es"><![CDATA[Natural discharge measures from bridges with piers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Priego-Hernández]]></surname>
<given-names><![CDATA[Gastón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez Vázquez]]></surname>
<given-names><![CDATA[Leydi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera]]></surname>
<given-names><![CDATA[Luis Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Trejo]]></surname>
<given-names><![CDATA[Fabian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Básicas ]]></institution>
<addr-line><![CDATA[Cunduacán Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Comisión Nacional del Agua Subgerencia Técnica ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ingeniería y Arquitectura ]]></institution>
<addr-line><![CDATA[Cunduacán Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>9</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282022000200022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282022000200022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282022000200022&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Measuring a river discharge from bridges with piers has been questioned. However, here, it is shown that now it is feasible to do it without losing accuracy using acoustic Doppler equipment. The objectives of this work were to analyze the possibility of measuring from bridges with piers with acoustic Doppler equipment and find if there is a difference between measuring upstream or downstream of the bridge. The discharge rate, the plain view, and cross-section hydrodynamics were evaluated and compared analytically and graphically in each section. Also, the intensity of the suspended sediments in each area was assessed. The results showed that the difference between measuring upstream or downstream of a bridge is less than 1.5%. Hydrodynamically, a difference in flow direction was obtained due to the curvature of the river and the bridge&#8217;s piers, but it does not affect the flow discharge measurement.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Aforar el caudal de un río desde puentes pilotados ha sido cuestionado; pero aquí se demuestra que ahora es factible hacerlo sin perder precisión utilizando equipos acústicos Doppler. Los objetivos de este trabajo fueron analizar la posibilidad de medir con equipos acústicos Doppler desde puentes pilotados y encontrar si existía diferencia entre medir aguas arriba o aguas abajo del puente. El caudal, la hidrodinámica en planta y transversal, se evaluaron y compararon analítica y gráficamente en cada sección. Asimismo, se evaluó la intensidad de transporte de los sedimentos en suspensión. Los resultados mostraron que la diferencia entre medir aguas arriba o aguas abajo de un puente es inferior al 1.5%. Hidrodinámicamente se obtuvo una diferencia en la dirección del flujo debido a la curvatura del río y las pilas del puente, pero esta no afecta la medición de la descarga del flujo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Flow field measurements]]></kwd>
<kwd lng="en"><![CDATA[acoustic Doppler profiler]]></kwd>
<kwd lng="en"><![CDATA[hydrodynamic fields]]></kwd>
<kwd lng="en"><![CDATA[beam intensity]]></kwd>
<kwd lng="es"><![CDATA[Aforo de corrientes en campo]]></kwd>
<kwd lng="es"><![CDATA[perfilador acústico Doppler]]></kwd>
<kwd lng="es"><![CDATA[campos hidrodinámicos]]></kwd>
<kwd lng="es"><![CDATA[intensidad de sedimentos]]></kwd>
</kwd-group>
</article-meta>
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<article-title xml:lang=""><![CDATA[Relationship between acoustic reflection and vibrational modes of elastic spheres]]></article-title>
<source><![CDATA[The Journal of the Acoustical Society of America]]></source>
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</article>
