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Auteur principal:	Carlos F. Rivas
Format:	Artículo científico
Langue:	es
Publié:	Universidad de los Andes 2012
Sujets:	Química sedimentos Metales pesados prueba de Friedman análisis de componentes principales
Accès en ligne:	https://www.redalyc.org/articulo.oa?id=93323436002
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Análisis correlacional y contenido de metales pesados en sedimentos superficiales de la avenida Argimiro Gabaldón de la ciudad de Barcelona, Estado Anzoátegui, Venezuela Carlos F. Rivas Carlos De La Cruz Ricardo De La Cruz Orlando De La Cruz Julio Colivet Química sedimentos Metales pesados prueba de Friedman análisis de componentes principales Se investigó los niveles de concentración de los metales pesados (Cu, Ni, Pb, Cr y Zn) en suelos adyacentes a la avenida Argimiro Gabaldón, Barcelona (Anzoátegui). El Ni y Cr mostraron valores inferiores al permitido por la Legislación Venezolana mientras que el Zn, Pb y Cu sobrepasaron los límites permisibles. La aplicación del Análisis de Componentes Principales (ACP) sintetiza que los dos primeros componentes principales alcanzan el 88,92% de la variabilidad total de los datos, obteniéndose altos coeficientes de correlación y observándose una contribución directamente proporcional para todas las variables y que además existe dos grupos diferenciados significativamente Pb-Zn y Ni-Cr-Cu. La prueba no paramétrica de Friedman demostró que existen diferencias significativas entre los metales, resaltando las comparaciones con el plomo 2012 artículo científico 1856-5301 https://www.redalyc.org/articulo.oa?id=93323436002 es http://www.redalyc.org/revista.oa?id=933 Avances en Química application/pdf Universidad de los Andes Avances en Química (República Bolivariana de Venezuela) Num.2 Vol.7

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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