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Detalles Bibliográficos
Autor principal:	Yolanda G. Gallaga Ortega
Formato:	Artículo científico
Lenguaje:	es
Publicado:	Universidad de Guanajuato 2002
Materias:	Multidisciplinarias (Ciencias Sociales) Esmectitas Beidellita Vermiculita Carga de capa Montmorillonita
Acceso en línea:	https://www.redalyc.org/articulo.oa?id=41612206
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Determinación y Análisis de Fórmulas Estructurales de Esmectitas del Estado de Guanajuato. Yolanda G. Gallaga Ortega Salvador Aguilar Becerra Esthela Ramos Ramírez Multidisciplinarias (Ciencias Sociales) Esmectitas Beidellita Vermiculita Carga de capa Montmorillonita En este trabajo se determinan las fórmulas estructurales de minerales arcillosos contenidos en arcillas provenientes de localizaciones geológicas de los municipios de Comonfort, Jerécuaro, Victoria y San Francisco del Rincón, pertenecientes al Estado de Guanajuato, México. El método utilizado fue el propuesto por Moore y Reynolds, mediante el análisis de la fórmula resultante, se deducen tanto el tipo de especie (dioctaédrica o trioctaédrica) como el origen y el valor de la carga de capa con lo cual se identifican los minerales arcillosos presentes. Se obtienen dos minerales tipo montmorillonita, uno tipo beidellita y otro más tipo vermiculita, éste último con tendencia a formar parte de la serie esmectita-vermiculita. 2002 artículo científico 0188-6266 https://www.redalyc.org/articulo.oa?id=41612206 es http://www.redalyc.org/revista.oa?id=416 Acta Universitaria application/pdf Universidad de Guanajuato Acta Universitaria (México) Num.3 Vol.12

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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