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weainug木虫 (正式写手)
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找到了一个新的数据库：British Library Direct's database
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British Library Direct's database How big is the British Library Direct database and how do you decide what goes into it? The database contains roughly 9 million records. It holds article-level data from the 20,000 most popular journal titles collected by the British Library. The list of journals catalogued on the database is continuously reviewed and new journal titles are added every month, while some less popular titles will drop out. How far back does the database go and how often is it updated? The database covers the last 5 years and it is updated almost every weekday. Sometimes you will come across records that are more than 5 years old, this is because the date we count is the date that the record was entered on the database, rather than the date of publication. Usually the two dates are very close, but sometimes there can be a longer gap, if we have back-catalogued a title, for example. Why do you not have abstracts available for every record? We only hold an abstract of an article when one was published in the original journal issue. Why can I download some articles immediately and not others? The option of Immediate Download is only available for documents within journal titles that are held by the British Library in electronic format (i.e. 'born digital'). Because they are stored electronically, they are available for you as soon as your payment has been processed. If the journal title is not stored digitally, but is instead held as a paper copy, a member of staff has to scan your article and send it to you. |
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2楼2006-03-15 11:53:14
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