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Détails bibliographiques
Auteur principal:	Osmundo Héctor Rodríguez Pérez
Format:	Artículo científico
Langue:	es
Publié:	Centro de Información y Gestión Tecnológica de Holguín 2018
Sujets:	Multidisciplinaria (Ciencias Naturales y Exactas) Cobre Soldadura
Accès en ligne:	https://www.redalyc.org/articulo.oa?id=181555444001 https://www.redalyc.org/journal/1815/181555444001/ https://www.redalyc.org/journal/1815/181555444001/html/ https://www.redalyc.org/journal/1815/181555444001/181555444001.epub https://www.redalyc.org/journal/1815/181555444001/movil
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Table des matières:

Soldadura del cobre. Recomendaciones tecnológicas Osmundo Héctor Rodríguez Pérez Multidisciplinaria (Ciencias Naturales y Exactas) Cobre Soldadura Se describen los grupos de aleaciones de cobre tales como latones y bronces y de esta forma se brindan las recomendaciones tecnológicas fundamentales para la soldadura de estos materiales por arco eléctrico manual y con llama oxiacetilénica. Se estudia la soldabilidad de estos materiales y se exponen los siguientes factores: influencia de los elementos aleantes, problemas de soldabilidad, principios de la selección de los materiales de aporte, preparación de las piezas, limpieza superficial, colocación relativa de las piezas, empleo de intensidades de corriente lo más altas posibles y con las mayores velocidades de soldadura, precalentamiento las piezas, corriente de soldadura con polaridad invertida, el arco corto, tratamiento térmico posterior y control de calidad de la calidad. 2018 artículo científico 1027-2127 https://www.redalyc.org/articulo.oa?id=181555444001 https://www.redalyc.org/journal/1815/181555444001/ https://www.redalyc.org/journal/1815/181555444001/html/ https://www.redalyc.org/journal/1815/181555444001/181555444001.epub https://www.redalyc.org/journal/1815/181555444001/movil es http://www.redalyc.org/revista.oa?id=1815 Ciencias Holguín application/pdf Centro de Información y Gestión Tecnológica de Holguín Ciencias Holguín (Cuba) Num.2 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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