再补充一个：【ScienceDirect】
http://www.sciencedirect.com/
About ScienceDirect
ScienceDirect is a leading full-text scientific database offering journal articles and book chapters from more than 2,500 peer-reviewed journals and more than 11,000 books. There are currently more than 11 million articles/chapters, a content base that is growing at a rate of almost 0.5 million additions per year.
Elsevier has digitized as much of the pre 1995 journal owned-content as possible, bringing articles from as far back as 1823 (The Lancet) to the desktop. Never has in-depth literature searching been so comprehensive and easy to find.
The platform offers sophisticated search and retrieval functionality that enables the user to maximize the effectiveness of their knowledge discovery process. New tools facilitate research work flow aids such as access to content at an early publication stage and efficient multiple document downloading of content that can be stored, printed and passed to colleagues.
The web environment offers new ways to present information as well as enhancing it with other content sources based on semantic technologies, e.g., NextBio. In addition, since 2003, many authors have been submitting extra value-added content associated with the research, such as audio and video files, datasets and other supplementary content, effectively accelerating research beyond the print format.
About this Info site
ScienceDirect’s Info site gives an introduction to everything ScienceDirect has to offer librarians and researchers. Here you will find an overview of the ScienceDirect family of products and services, a summary of the ScienceDirect content coverage, buying options, and the policies that govern its use.
If you do not find the answer to your question about ScienceDirect on this site, please contact us.
About Elsevier
ScienceDirect is a part of Elsevier. Headquartered in Amsterdam, The Netherlands, the company is the world's largest scientific, technical and medical information provider and publishes over 2,000 journals as well as books and secondary databases.
Elsevier is a member of the Reed Elsevier plc group, a world-leading publisher and information provider. Operating in the scientific, legal and business-to-business sectors, Reed Elsevier provides high-quality and flexible information solutions to professional users, with increasing emphasis on the Internet as means of delivery.
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