China HowNet can be said to be the master repository of knowledge resources in China, providing data resources in Chinese and foreign languages from all walks of life, but the charge is relatively high, which is suitable for people who need to download several documents.
2. Wanfang Database
Including data documents, periodical papers, degree conferences, Chinese and foreign standards, laws and regulations, scientific and technological achievements, China patents, etc. The collected documents are of high quality.
3. National Library Reference Union
Keyword search is sorted by title or author. Besides periodicals, you can also choose books, newspapers, dissertations, meeting minutes, patents, videos and other contents. As long as you leave your email address on the right side of the website, the paper you choose will be sent directly to your email address.
Reading program
There are 2.78 million kinds of bibliographic information, 265,438+10,000 kinds of original Chinese books and 800 million pages of Chinese materials. , which can be used for in-depth cataloging and full-text retrieval of book contents, literature trial reading, and literature resources obtained by mail.
5.OALib library
OALib also has a large amount of academic papers, which also involves various fields. The key is that all articles can be downloaded for free.
6.seek68 Literature Museum
Seek68 document library is suitable for college students and researchers, and has a large number of Chinese and foreign document resources, difficult document solutions and paper duplicate checking.
7. Science hub
Sci-Hub is a powerful tool for downloading documents, and everyone must be familiar with it. More than 90% of English literature you read in major SCI magazines can be downloaded for free. However, due to copyright issues, the website will change frequently.
8. Scientific research
Scintific research is engaged in the publication and retrieval of international academic conference records, as well as the publication and distribution of professional academic journals and monographs. The content covers physics, chemistry, medicine, biology, mathematics, communication, computer and other fields.
9.ABC chemistry
ABC Chemistry is a free online journal database of full-text chemistry, which is divided into two categories: permanent journals and temporary journals.