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Main Author:	G. González de la Cruz
Format:	Artículo científico
Language:	en
Published:	Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. 2000
Subjects:	Física, Astronomía y Matemáticas
Online Access:	https://www.redalyc.org/articulo.oa?id=94201011
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Effective thermal conductivity and thermal diffusivity of two layer samples in photoacoustic expermients G. González de la Cruz G. N. Logvinov N. Muñoz Aguirre Yu. G. Gurevich Física, Astronomía y Matemáticas The effective thermal conductivity and thermal diffusivity are determined in one-dimensional bounded two-layer sample within themodel of photoacoustic experiments. A new approach for calculating these thermal parameters is suggested. It is shown that effectiveparameters depend not only on the physical properties of separate layers ,but on the manner of measuring these parameters and thepoints of measurements. Therefore, there exist several values of effective thermal conductivity and thermal diffusivity. The cases oflow and high modulation frequencies are examined. The thermal property of interface is taken into account.Keywords: Diffusivity, Photoacoustic, Photothermal, Isothermality, Superlattices 2000 artículo científico 1665-3521 https://www.redalyc.org/articulo.oa?id=94201011 en 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.10

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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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