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1. Verfasser:	Landy Y. Castro González
Format:	Artículo científico
Sprache:	es
Veröffentlicht:	Universidad Tecnológica de La Habana "José Antonio Echeverría" (CUJAE) 2016
Schlagworte:	Ingeniería hidráulico cálculo termo Agua supercrítica reactores nucleares dinámica de fluidos computacional
Online-Zugang:	https://www.redalyc.org/articulo.oa?id=329145824006
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Metodología para el cálculo acoplado neutrónico-termohidráulico del reactor nuclear de agua ligera de alto desempeño Landy Y. Castro González Leorlen Rojas Mazaira Carlos García Hernández Brayner de Olivera Lira Ingeniería hidráulico cálculo termo Agua supercrítica reactores nucleares dinámica de fluidos computacional El uso del agua supercrítica como refrigerante en los reactores nucleares es un reto para su diseño y operación, pues es necesario tener en cuenta la fuerte influenc ia de las propiedades termodinámicas del agua supercrítica enlas propiedade s moderadoras de los neutrone s. En este trabajo se desarrolló una metodología basada en un código de Monte-Carlo para el cálculo neutrónico y un código de Dinámica de Fluido Computacional para el cálculo termohidráulico, con el ob jetivo de realizar el cálculo acoplado neutrónico-termohidráulico de un conjunto combustible de un Rea ctor de Agua Supercrítica de Alto Desempeño. Empleando la metodología desarrollada fueronobtenido s los perfiles de temperatura y potencia liberada en las barras combustibles del conjunto, los de temper atura en la envoltura de los elementos combustibles y los perfiles de temperatura y densidad del agua en la zona refrigerante y en la zona moderadora del conjunto. Los resultados describen acertadamente el comportamiento de dichos parámetros en el conjunto combustible promedio. 2016 artículo científico 1815-5901 https://www.redalyc.org/articulo.oa?id=329145824006 es http://www.redalyc.org/revista.oa?id=3291 Ingeniería Energética application/pdf Universidad Tecnológica de La Habana "José Antonio Echeverría" (CUJAE) Ingeniería Energética (Cuba) Num.2 Vol.XXXVII

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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