Les empreintes paléothermiques du sous-sol

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Détails bibliographiques
Publié dans:	Géosciences No 3
Auteur principal:	Guillou-Frottier, Laurent.
Support:	Article en ligne
Langue:	Français
Publié:	2006.
Sujets:	Articles de périodiques
Résumé:	Les variations climatiques des derniers millénaires ont laissé des empreintes dans les profondeurs du sous-sol. Par simple diffusion thermique, les fluctuations de la température du sol se propagent lentement en profondeur. En analysant scrupuleusement les courbures des géothermes, il est possible de reconstruire les grands traits de l'histoire climatique d'une région, à une échelle de temps allant jusqu'à plusieurs millénaires. Les analyses globale des données géothermiques ont ainsi permis de déchiffrer les variations spatiales des tendances paléoclimatiques
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// 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 true; } /** * 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, $data) { if ($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); }

* * @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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Les empreintes paléothermiques du sous-sol

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