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Bibliographic Details
Main Author:	Armando A. Paneque-Quevedo
Format:	Artículo científico
Language:	es
Published:	Universidad de Oriente 2023
Subjects:	Química Vidrio reciclaje sólido amorfo dióxido de silicio estructura cristalina
Online Access:	https://www.redalyc.org/articulo.oa?id=443582624007 https://www.redalyc.org/journal/4435/443582624007/ https://www.redalyc.org/journal/4435/443582624007/html/ https://www.redalyc.org/journal/4435/443582624007/443582624007.epub https://www.redalyc.org/journal/4435/443582624007/movil
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Naturaleza química del vidrio y su impacto en la sociedad Armando A. Paneque-Quevedo Alicia M. Díaz-García Noeldris López-López Química Vidrio reciclaje sólido amorfo dióxido de silicio estructura cristalina El vidrio tiene, generalmente, como óxido formador el dióxido de silicio, el cual se acompaña de otros óxidos metálicos que permiten darles brillo, transparencia, estabilidad química, insolubilidad en agua y color. Es el material inventado por el hombre más versátil que existe, y se destaca entre otros materiales, porque puede reciclarse infinitamente, permitiendo el ahorro de recursos naturales, energía y costes. Históricamente ha desempeñado importantes funciones en la arquitectura, la automoción, los artículos para el hogar y los envases. Hoy es un elemento esencial en sectores clave como la energía, la biomedicina, la agricultura, la electrónica, las telecomunicaciones, la óptica y el sector aeroespacial. El presente trabajo se suma a los esfuerzos de las Naciones Unidas y la comunidad científica internacional, para que se declarara el 2022 Año Internacional del Vidrio, conmemoración que celebra el pasado, el presente y el futuro del material más transformador de la historia de la humanidad. 2023 artículo científico 0258-5995 https://www.redalyc.org/articulo.oa?id=443582624007 https://www.redalyc.org/journal/4435/443582624007/ https://www.redalyc.org/journal/4435/443582624007/html/ https://www.redalyc.org/journal/4435/443582624007/443582624007.epub https://www.redalyc.org/journal/4435/443582624007/movil es http://www.redalyc.org/revista.oa?id=4435 Revista Cubana de Química application/pdf Universidad de Oriente Revista Cubana de Química (Cuba) Num.1 Vol.35

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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