
FreeTechBooks
This site lists free online computer science, engineering and programming books, textbooks and lecture notes, all of which are legally and freely available over the Internet. Throughout this site, other terms are used to refer to a book, such as ebook, text, document, monogram or notes.
点击进入 - 2023-11-03 - 收藏
比菲尔德学术搜索引擎
超过3.4亿件科学文献来自超过11000免费来源。BASE是世界性大型搜搜引擎,存储来自互联网上免费的开放获取科学文献。BASE is one of the world\'s most voluminous search engines especially for academic web resources. BASE provides more than 340 million documents from more than 11,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.
点击进入 - 2023-11-03 - 收藏
PDF SEARCH ENGINE - PDF,DOC,PPT,Ebook search ENGINE
FREE PDF SEARCH ENGINE. support all pdf,DOC,PPT,Ebook! free pdf download. You can search all kind of documents!
点击进入 - 2023-11-02 - 收藏
chemBlink官网
chemBlink provides a free database of chemicals from around the World, searchable for product identifications, CAS numbers, SDS, formulas, suppliers and more. Contact us today.
点击进入 - 2023-11-02 - 收藏
中国科学院文献情报中心
中国科学院知识服务平台www.las.ac.cn中国科学院文献情报系统由院所两级的文献情报机构组成,协同面向研究所科研一线提供文献情报与知识服务。为贯彻中国科学院文献情报系统中长期发展规划纲要,推进中国科学院文献情报系统“十三五”期间新任务落实,进一步加强和完善全院文献情报工作协同机制,中国科学院文献情报中心牵头组织成立了10个全院文献情报系统的业务协调工作组,通过建立常规沟通和协调机制开展全院文献情报服务,共同决策落实项目任务、重要活动及保障措施,以更好地服务支撑全院科研创新活动。
点击进入 - 2023-11-02 - 收藏




