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Détails bibliographiques
Auteur principal:	Carlos González
Format:	Artículo científico
Langue:	es
Publié:	Universidad Pedagógica Experimental Libertador 2010
Sujets:	Educación Tomografía acústica retroproyección filtrada Gas en régimen estacionario
Accès en ligne:	https://www.redalyc.org/articulo.oa?id=41028422010
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Tomografía acústica axial computarizada para flujos convectivos de gas (aire) Carlos González Rodney Reyna Regnoult Educación Tomografía acústica retroproyección filtrada Gas en régimen estacionario Como bien es sabido la tomografía axial computarizada tiene múltiples aplicaciones en el ámbito médico, industrial, y se emplea para la elaboración de los tomogramas con radiaciones ionizantes, rayos x, entre otras. En este trabajo se aplica la tomografía axial computarizada con ultrasonido para la generación de imágenes de flujos convectivos de aire caliente en régimen estacionario utilizando transductores ultrasónicos para gases de una frecuencia de 40Khz. Para la generación de los tomogramas se utiliza el algoritmo de la retroproyección filtrada de radón como la dependencia del sonido al cambio de temperatura en el gas. 2010 artículo científico 1317-5815 https://www.redalyc.org/articulo.oa?id=41028422010 es http://www.redalyc.org/revista.oa?id=410 Sapiens. Revista Universitaria de Investigación application/pdf Universidad Pedagógica Experimental Libertador Sapiens. Revista Universitaria de Investigación (República Bolivariana de Venezuela) Num.2 Vol.11

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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