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Bibliographic Details
Main Author:	Guillermo Salas-Banuet
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional de Colombia 2015
Subjects:	Ingeniería química Afinidad historia termodinámica electronegatividad
Online Access:	https://www.redalyc.org/articulo.oa?id=49637154002
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La importancia de llamarse afinidad química. Parte VI: La cosecha Guillermo Salas-Banuet José Ramírez-Vieyra Oscar Restrepo-Baena María Noguez-Amaya Bryan Cockrell Ingeniería química Afinidad historia termodinámica electronegatividad La escala cuantitativa de electronegatividad obtenida por Linus Pauling, como resultado de aquellas antecedentes cualitativas de electroafinidad, generó múltiples propuestas diferentes e interesantes, hasta el día de hoy, lo que ha mostrado ser el esfuerzo del ingenio por conseguir un concepto universal de afinidad, que ha resultado incompleto. La termodin ámica, específicamente su rama termoquímica, ha ofrecido una ex plicación, tampoco universal, que ha sido aceptada por la Unión Internacional de Química Pura y Aplicada (IUPAC, por sus siglas en inglés ), igual de incompleta. En ambos casos, se p iensa que el error está en cons iderar a la afinidad como una propiedad, en vez de un comportamiento. 2015 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49637154002 es http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.190 Vol.82

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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