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Bibliographic Details
Main Author:	Marlon Martínez-Reina
Format:	Artículo científico
Language:	es
Published:	Universidad de Oriente 2016
Subjects:	Química filatelia Gases ideales sellos postales didáctica de la Química
Online Access:	https://www.redalyc.org/articulo.oa?id=443547538009
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Filatelia y Didáctica de la Química: un ejemplo con los Gases Ideales Marlon Martínez-Reina Eliseo Amado-González Química filatelia Gases ideales sellos postales didáctica de la Química En este artículo se presentan 57 sellos postales emitidos por diferentes países para hacer una descripción didáctica de los gases ideales: se inicia con ejemplos de materia en estado gaseoso (aire, gas natural, dióxido de carbono, flúor, oxígeno, ozono, etc.), se continua con un desarrollo histórico de los gases (Paracelso, van Helmont, Cavendish, Priestley y Lavoisier); los aspectos disciplinares con las variables y unidades de la ecuación de estado (presión, temperatura, volumen y cantidad de sustancia);finalmente, se relacionan con sellos postales las leyes (Boyle, Charles, Gay-Lussac y Avogadro) y la teoría cinética molecular de los gases (van der Waals, Joule, Maxwell, Boltzmann y Gibbs). 2016 artículo científico 0258-5995 https://www.redalyc.org/articulo.oa?id=443547538009 es http://www.redalyc.org/revista.oa?id=4435 Revista Cubana de Química application/pdf Universidad de Oriente Revista Cubana de Química (Cuba) Num.3 Vol.28

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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