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Autore principale:	Javier Ramón Sotomayor Castellanos
Natura:	Artículo científico
Lingua:	es
Pubblicazione:	Universidad de Guanajuato 2014
Soggetti:	Multidisciplinarias (Ciencias Sociales) Densidad anisotropía dirección radial dirección tangencial dirección longitudinal
Accesso online:	https://www.redalyc.org/articulo.oa?id=41632450001
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Anisotropía del módulo de elasticidad y de resistencia en compresión de la madera de Pinus michoacana, Pinus douglasiana y Pinus pringlei Javier Ramón Sotomayor Castellanos Mariana Ramírez Pérez Multidisciplinarias (Ciencias Sociales) Densidad anisotropía dirección radial dirección tangencial dirección longitudinal El carácter anisotrópico de la madera le confiere versatilidad para el diseño de productos y estructuras. El objetivo de esta investigación fue determinar el módulo de elasticidad y resistencia en compresión en las direcciones radial, tangencial y longitudinal de madera de P. michoacana, P. douglasiana y P. pringlei. Se realizaron ensayos de compresión en 39 probetas y se determinó su contenido de humedad y su densidad básica. Para cada una de las especies, los resultados del análisis de varianza entre las direcciones radial, tangencial y longitudinal del módulo de elasticidad y de resistencia en compresión indicaron una diferencia significativa entre las medias de los valores de las tres direcciones para los parámetros elásticos y resistentes. Estos resultados confirman que las propiedades elásticas y mecánicas de la madera varían según la dirección en que se miden, verificando el carácter anisotrópico del material. 2014 artículo científico 0188-6266 https://www.redalyc.org/articulo.oa?id=41632450001 es http://www.redalyc.org/revista.oa?id=416 Acta Universitaria application/pdf Universidad de Guanajuato Acta Universitaria (México) Num.5 Vol.24

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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