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Bibliographic Details
Main Author:	Ernesto Chigo Anota
Format:	Artículo científico
Language:	es
Published:	Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. 2011
Subjects:	Física, Astronomía y Matemáticas Teoría DFT Carburo de estaño
Online Access:	https://www.redalyc.org/articulo.oa?id=94218546003
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Análisis por simulación molecular de las propiedades electrónicas de la hoja de SnC hexagonal Ernesto Chigo Anota Física, Astronomía y Matemáticas Teoría DFT Carburo de estaño A través de cálculos de primeros principios basados en la Teoría del Funcional de la Densidad (DFT) a nivel LDA (PWC) se investiga las propiedades electrónicas de la hoja de carburo de estaño (SnC) no dopada y dopada con nitrógeno. Además, se analizó el efecto de las vacancias de estaño y carbono sobre las propiedades electrónicas de este material. Se encontró que la geometría óptima de la hoja de SnC es plana, solo para el caso del modelo no dopado. Además, los cálculos realizados muestran una transición semiconductor (Sn12C12H12)-conductor (Sn12C11NH12)-semimetal (para los demás casos) debido a la incorporación de N en la hoja de, obteniéndose valores de brecha prohibida de 2.07 eV para el modelo no dopado hasta 0.14 eV para cuando existe una vacancia de Ge. Con esto también un fuerte incremento en la polaridad de la hoja se presenta cuando un defecto NC es introducido en la estructura, pasando de iónico a covalente. 2011 artículo científico 1665-3521 https://www.redalyc.org/articulo.oa?id=94218546003 es http://www.redalyc.org/revista.oa?id=942 Superficies y vacío application/pdf Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Superficies y vacío (México) Num.1 Vol.24

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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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