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Bibliographic Details
Main Author:	Jorge Calderón G.
Format:	Artículo científico
Language:	es
Published:	Universidad Tecnológica de Pereira 2007
Subjects:	Ingeniería Magnetita polipirrol sonda kelvin de barrido recubrimientos compuestos
Online Access:	https://www.redalyc.org/articulo.oa?id=84903605
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Efecto de la incorporación de magnetita sobre las propiedades eléctricas de recubrimientos de polipirrol depositados sobre acero inoxidable Jorge Calderón G. Paula Montoya I. Franklin Jaramillo I. Ingeniería Magnetita polipirrol sonda kelvin de barrido recubrimientos compuestos Un gran número de aplicaciones tecnológicas ha estimulado el interés por elestudio del polipirrol. En el presente trabajo fueron sintetizadaselectroquímicamente sobre acero inoxidable 304, películas de polipirrol puras yen presencia de partículas de magnetita. La polimerización fue llevada a caboempleando como electrolito H2SO4, con y sin la adición de FeCl3,potenciodinámica y galvanostáticamente. Se determinó la influencia de laspartículas de magnetita sobre la estructura y propiedades eléctricas de losrecubrimientos mediante Sonda Kelvin de Barrido (SKB), por medio demedición de potenciales de electrodo en la interfase polímero/metal y de latopografía de los recubrimientos compuestos. 2007 artículo científico 0122-1701 https://www.redalyc.org/articulo.oa?id=84903605 es http://www.redalyc.org/revista.oa?id=849 Scientia Et Technica application/pdf Universidad Tecnológica de Pereira Scientia Et Technica (Colombia) Num.36 Vol.XIII

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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