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Main Authors:	Ritchie, Stephanie M., Young, Lauren M., Sigman, Jessica
Format:	Recurso educativo Open Access
Language:	en
Published:	2018
Subjects:	Comparative Analysis Bibliographic Databases Scientific and Technical Information Agriculture Agricultural Education Electronic Libraries Content Analysis Literature Reviews Statistical Analysis Visualization Relevance (Education) Special Libraries Library Materials Online Vendors
Online Access:	https://eric.ed.gov/?id=EJ1182723
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author	Ritchie, Stephanie M. Young, Lauren M. Sigman, Jessica
author_facet	Ritchie, Stephanie M. Young, Lauren M. Sigman, Jessica Ritchie, Stephanie M. Young, Lauren M. Sigman, Jessica
collection	Education Resources Information Center
contents	A Comparison of Selected Bibliographic Database Subject Overlap for Agricultural Information Ritchie, Stephanie M. Young, Lauren M. Sigman, Jessica Comparative Analysis Bibliographic Databases Scientific and Technical Information Agriculture Agricultural Education Electronic Libraries Content Analysis Literature Reviews Statistical Analysis Visualization Relevance (Education) Special Libraries Library Materials Online Vendors Agricultural researchers and science librarians must understand which research literature databases provide the most comprehensive coverage of agricultural subjects to support their inquiries. Once the domain of a few specialized databases, agricultural research literature is now covered by broad, multidisciplinary databases. The purpose of this study is to determine the most comprehensive database(s) for agricultural literature searching. We compared the coverage of eight bibliographic databases for a range of agricultural sub-topics to determine how much overlap exists and which database(s) best support discovery of agricultural research literature. We found that the multidisciplinary databases provided the most comprehensive coverage, along with one of the agriculture-specific databases. This study will help researchers and librarians determine where to invest their effort and resources when looking to find agricultural research content.
format	Recurso educativo Open Access
id	eric_EJ1182723
institution	ERIC Institute of Education Sciences
language	en
publishDate	2018
record_format	eric
spellingShingle	A Comparison of Selected Bibliographic Database Subject Overlap for Agricultural Information Ritchie, Stephanie M. Young, Lauren M. Sigman, Jessica Comparative Analysis Bibliographic Databases Scientific and Technical Information Agriculture Agricultural Education Electronic Libraries Content Analysis Literature Reviews Statistical Analysis Visualization Relevance (Education) Special Libraries Library Materials Online Vendors A Comparison of Selected Bibliographic Database Subject Overlap for Agricultural Information Ritchie, Stephanie M. Young, Lauren M. Sigman, Jessica Comparative Analysis Bibliographic Databases Scientific and Technical Information Agriculture Agricultural Education Electronic Libraries Content Analysis Literature Reviews Statistical Analysis Visualization Relevance (Education) Special Libraries Library Materials Online Vendors Agricultural researchers and science librarians must understand which research literature databases provide the most comprehensive coverage of agricultural subjects to support their inquiries. Once the domain of a few specialized databases, agricultural research literature is now covered by broad, multidisciplinary databases. The purpose of this study is to determine the most comprehensive database(s) for agricultural literature searching. We compared the coverage of eight bibliographic databases for a range of agricultural sub-topics to determine how much overlap exists and which database(s) best support discovery of agricultural research literature. We found that the multidisciplinary databases provided the most comprehensive coverage, along with one of the agriculture-specific databases. This study will help researchers and librarians determine where to invest their effort and resources when looking to find agricultural research content.
title	A Comparison of Selected Bibliographic Database Subject Overlap for Agricultural Information
topic	Comparative Analysis Bibliographic Databases Scientific and Technical Information Agriculture Agricultural Education Electronic Libraries Content Analysis Literature Reviews Statistical Analysis Visualization Relevance (Education) Special Libraries Library Materials Online Vendors
url	https://eric.ed.gov/?id=EJ1182723

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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