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Bibliographic Details
Main Author:	Oscar Torras Guzmán
Format:	Artículo científico
Language:	es
Published:	Instituto Nacional de Investigaciones en Metrología 2007
Subjects:	Ingeniería
Online Access:	https://www.redalyc.org/articulo.oa?id=223014972002
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ESTABILIDAD DE LA FASE DE LA SEÑAL HORARIA TRANSMITIDA POR LA EMISORA RADIO RELOJ Oscar Torras Guzmán Silvia Iglesias Valcárcel Ingeniería La disponibilidad de señales horarias en todo momento es de gran importancia en todas aquellas aplicaciones donde es necesario controlar los relojes internos de sistemas con elevados requerimientos de temporización. Para tal fin desde hace más de dos décadas se emplea la emisora de radiodifusión Radio Reloj (RR), la cual transmite en la banda de ondas medias (banda 6). Señales horarias obtenidas de un oscilador de alta estabilidad son mezcladas con la voz de los locutores formando parte de la programación habitual con un formato tal que no afecta al tradicional de la emisora, además de que es muy sencillo y facilita el empleo de las mismas con un costo extremadamente bajo. Los estudios realizados en mediciones experimentales en el Laboratorio de Tiempo, Frecuencia y Electrónica (LTFE) del Instituto Nacional de Investigaciones en Metrología (INIMET) demostraron que la estabilidad relativa de la fase de la señal horaria de 1 s transmitida en la Ciudad de la Habana es mayor que 3E-9, posibilitando una amplia utilización de las transmisiones. En la práctica se han podido comparar y sincronizar escalas de tiempo con incertidumbres inferiores a 3 ¿s empleando la técnica de visión común y se han obtenido resultados en la comparación y ajuste de la frecuencia de relojes con una incertidumbre relativa menor que 3E-10 para tiempos de medición de 24 h . Estos resultados muestran la factibilidad del empleo de emisoras de radio difusión que operan en la banda 6 y específicamente en el intervalo de 500 kHz a 1,55 MHz para la difusión de señales horarias a distancias cortas y medias. 2007 artículo científico 0138-8576 https://www.redalyc.org/articulo.oa?id=223014972002 es http://www.redalyc.org/revista.oa?id=2230 Boletín Científico Técnico INIMET application/pdf Instituto Nacional de Investigaciones en Metrología Boletín Científico Técnico INIMET (Cuba) Num.1

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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