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Dettagli Bibliografici
Autore principale:	Aída Gutiérrez Alejandre
Natura:	Artículo científico
Lingua:	es
Pubblicazione:	Universidad Nacional Autónoma de México 2017
Soggetti:	Multidisciplinaria (Ciencias Naturales y Exactas) unam catálisis catalizadores nanomateriales Facultad de Química
Accesso online:	https://www.redalyc.org/articulo.oa?id=757781180001
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Panorama de la investigación en catálisis en la Facultad de Química de la UNAM Aída Gutiérrez Alejandre Multidisciplinaria (Ciencias Naturales y Exactas) unam catálisis catalizadores nanomateriales Facultad de Química Se presenta un panorama de la investigación desarrollada en el área de catálisis en la Facultad de Química de la Universidad Nacional Autónoma de México (fq-unam). Primero se da una breve descripción de la conformación de la fq y los diferentes programas de posgrado en los que participa y aquellos involucrados en catálisis, para luego pasar a las líneas de investigación y proyectos por departamento académico. Posteriormente, doy a conocer la infraestructura disponible, fuentes de financiamiento, colaboración y proyectos para concluir con los logros y perspectivas en el área de catálisis. 2017 artículo científico 2007-5979 https://www.redalyc.org/articulo.oa?id=757781180001 es http://www.redalyc.org/revista.oa?id=7577 Mundo Nano application/pdf Universidad Nacional Autónoma de México Mundo Nano (México) Num.18 Vol.10

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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