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Bibliographic Details
Main Author:	Jorge Luis Inche Mitma
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional Mayor de San Marcos 2010
Subjects:	Ingeniería Ruido fibra aislante onda sonora absorción sonora
Online Access:	https://www.redalyc.org/articulo.oa?id=81619989012
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Diseño y desarrollo de nuevos materiales textiles para el aislamiento y acondicionamiento acústico Jorge Luis Inche Mitma Alfonso Ramón Chung Pinzás Roberto Vizarreta Chia Ingeniería Ruido fibra aislante onda sonora absorción sonora El presente artículo trata el problema de ¿Cómo disminuir la emisión de ruido en un determinado ambiente? Para responder a esta interrogante, se han considerado dos materiales absorbentes: la lana de vidrio y la napa textil, los cuales, mediante la construcción de un prototipo de panel acústico, se sometieron a un experimento siguiendo los lineamientos de la norma UNE-EN 20354, permitiendo aislamientos acústicos entre 20 dB a 30 dB para intensidades de sonidos entre 100 a 120 dB. 2010 artículo científico 1560-9146 https://www.redalyc.org/articulo.oa?id=81619989012 es http://www.redalyc.org/revista.oa?id=816 Industrial Data application/pdf Universidad Nacional Mayor de San Marcos Industrial Data (Perú) Num.1 Vol.13

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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