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Bibliographic Details
Main Author:	M. Salazar-Villanueva
Format:	Artículo científico
Language:	es
Published:	Sociedad Mexicana de Física A.C. 2007
Subjects:	Física, Astronomía y Matemáticas cúmulos metálicos agregados de silicio deformación estructural Teoría de funcionales de densidad cálculos basados en mecánica cuántica
Online Access:	https://www.redalyc.org/articulo.oa?id=57028299007
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Inestabilidades vibracionales y esfuerzo ideal en el cúmulo de Si7 M. Salazar-Villanueva A. Bautista Hernández P.H. Hernández Tejeda J.F Rivas Silva J.A. Ascencio Física, Astronomía y Matemáticas cúmulos metálicos agregados de silicio deformación estructural Teoría de funcionales de densidad cálculos basados en mecánica cuántica Recientemente se ha iniciado el estudio del esfuerzo ideal en nanomateriales. En el caso de c ́ umulos el esfuerzo ideal m ́ aximo se calcula en el punto de inflexi ́ on de la curva de energ ́ ıa vs. deformaci ́ on. En este trabajo extendemos lo realizado por Kitamura et al. , incluyendo la parte vibracional en el estudio del esfuerzo ideal para c ́ umulos de Si 6 y Si 7 usando la Teor ́ ıa del Funcional de la Densidad (DFT). Para el tratamiento de los t ́ erminos de correlaci ́ on e intercambio se consider ́ o la aproximaci ́ on GGA bajo la parametrizaci ́ on propuesta por Perdew y Wang. Se presenta el diagrama carga deformaci ́ on, obtenido bajo tensi ́ on axial en la direcci ́ on " yy . Estos resultados son comparados con los correspondientes hechos por Kitamura et al. [1], para el c ́ umulo de Si 6 los cuales tienen buena concordancia. Para probar la estabilidad vibracional del c ́ umulo, se obtuvieron las frecuencias como funci ́ on de la deformaci ́ on. Se encontr ́ o que el modo de vibraci ́ on e 00 2 hace inestable al c ́ umulo de Si 7 aproximadamente a 0.027 de deformaci ́ on. 2007 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57028299007 es http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.5 Vol.53

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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 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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