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Détails bibliographiques
Auteur principal:	Gerardo García Gil
Format:	Artículo científico
Langue:	es
Publié:	Universidad Nacional Autónoma de México 2002
Sujets:	Ciencias de la Tierra México Calakmul hidrografía Geomorfología
Accès en ligne:	https://www.redalyc.org/articulo.oa?id=56904802
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Table des matières:

Reconocimiento geomorfológico e hidrográfico de la Reserva de la Biosfera Calakmul, México Gerardo García Gil Mario Arturo Ortiz Pérez José Luis Palacio Prieto Ciencias de la Tierra México Calakmul hidrografía Geomorfología La interpretación de fotografías aéreas y la generación de un sistema de información geográfica permitiórealizar el reconocimiento geomorfológico e hidrográfico de la Reserva de la Biosfera Calakmul. Se digitalizaroncartas topográficas escala 1:50 000 con curvas de nivel cada 10 m, se fotointerpretaron rasgos físicos e hidrográficosen escala 1:25 000 y se corrigieran digitalmente para incorporarlos al Sistema de Información Geográfica. Lasgeoformas de la zona de estudio fueron clasificadas por su morfología y por la evidencia de procesos erosivos y dedisolución kárstica. Las unidades de relieve determinadas son: laderas, mesetas estructurales de desarrollo kárstico;valles fluviales y kársticos, planicie estructural y zonas de inundación temporal y permanente. La red hidrográficasuperficial está poco desarrollada, por lo que dominan condiciones de infiltración de las aguas pluviales y fluvialesque favorecen la alimentación a los acuíferos. 2002 artículo científico 0188-4611 https://www.redalyc.org/articulo.oa?id=56904802 es http://www.redalyc.org/revista.oa?id=569 Investigaciones Geográficas (Mx) application/pdf Universidad Nacional Autónoma de México Investigaciones Geográficas (Mx) (México) Num.48

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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