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Dettagli Bibliografici
Autore principale:	César Bublitz
Natura:	Artículo científico
Lingua:	pt
Pubblicazione:	Universidade Federal de Santa Maria 2016
Soggetti:	Estudios Ambientales Combustão Autovalores Mecanismo esqueleto Redução de mecanismos
Accesso online:	https://www.redalyc.org/articulo.oa?id=467546196023
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Sommario:

Técnicas matemáticas na redução de mecanismos cinéticos com ilustração para chamas do metano César Bublitz Álvaro Luiz de Bortoli Estudios Ambientales Combustão Autovalores Mecanismo esqueleto Redução de mecanismos O tratamento de mecanismos cinéticos de reação detalhados de combustão é muito caro computacionalmente, principalmente quando o objetivo é a implementação de modelos de CFD (Dinâmica de Fluidos Computacional); por isso, grande esforço na procura por métodos de redução de mecanismos tem sido observado. Na busca por técnicas eficientes, várias ideias e teorias surgiram nos últimos anos. Análise de sensibilidade, lumping e DRG (Directed Relation Graph) são algumas dessas técnicas, as quais parecem ser ferramentas poderosas que podem ajudar neste desafio. Este trabalho mostra estas estratégias, descrevendo de maneira objetiva suas aplicações na redução de mecanismos de reação. Um mecanismo reduzido para chamas do metano consistindo de seis etapas entre nove espécies reativas é obtido a partir do mecanismo esqueleto, o qual consiste de 25 reações. 2016 artículo científico 0100-8307 https://www.redalyc.org/articulo.oa?id=467546196023 pt http://www.redalyc.org/revista.oa?id=4675 Ciência e Natura application/pdf Universidade Federal de Santa Maria Ciência e Natura (Brasil) Num.1 Vol.38

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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Documenti analoghi

Environment & details:

Environment & details: