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Bibliographic Details
Main Author:	Rómel Solís Carcaño
Format:	Artículo científico
Language:	es
Published:	Universidad Autónoma de Yucatán 2003
Subjects:	Computación Concreto agregados resistencia durabilidad zona de transición de la interfase
Online Access:	https://www.redalyc.org/articulo.oa?id=46770203
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Influencia de los agregados pétreos en las características del concreto Rómel Solís Carcaño Éric Iván Moreno José Luis Chan Yam Computación Concreto agregados resistencia durabilidad zona de transición de la interfase El concreto es un material compuesto, en el cual existe una gran variabilidad en las características de suscomponentes, especialmente en los agregados pétreos. Siendo éstas de carácter físico y químico, producen diferentesefectos, tanto en la trabajabilidad del concreto como en su comportamiento en estado endurecido, el cual regirá suvida de servicio. Este artículo presenta los avances recientes en el tema de los agregados para concreto y puede serútil, tanto para el diseñador o el constructor de estructuras, como para el estudiante interesado en el tema de latecnología del concreto, siendo una guía para lograr una mejor comprensión del importante papel que los agregadosdesempeñan en el material. 2003 artículo científico 1665-529X https://www.redalyc.org/articulo.oa?id=46770203 es http://www.redalyc.org/revista.oa?id=467 Ingeniería application/pdf Universidad Autónoma de Yucatán Ingeniería (México) 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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