Commonly used retrieval networks include: China Knowledge Network (CNKI), VIP Network, Wanfang Database, Superstar Electronic Library, China Sci-tech Periodical Database (NSTL), National Science and Technology Library and China Pharmaceutical Literature, as well as your university library, google, soopat, uspto, Daokebaba, Douding Network, Woodworm, Reading Show Account Network, Free Resource Network, Science Citation Index, Elsevier.
Take Pubmed search as an example:
1, open the browser on the computer, and then enter the address of Baidu's home page in the browser address interface (of course, if you can memorize the URL of Pubmed database, you can also enter the address directly in the browser address bar), because posting the address is not allowed here, so you don't put the address out, and you can get it according to the following process.
2. Enter the keyword Pubmed in Baidu search box, and then click the search button to search. The first few websites where you can see the search results are the addresses of Pubmed websites.
3. Select a website to enter, then enter the homepage of Pubmed website, and click the advanced button at the bottom of the search box to enter the advanced search interface.
4. After entering the advanced search interface, click all fields in the search interface to select the search range, and you can select various ranges to search.
5 here, select the title and date to search, enter the keywords of the document to be searched in the input box behind the title, and select the publication time of the document in the second line. If you need more scope restrictions, you can click the+button after the second line to add search scope restrictions.
6. When the keywords are filled in the search box, the whole search expression will be displayed in the search box at the top, which are: (it [title]) and ("2014" [date-publication]: "3000" [date-publication]).
7. After completing the above steps, click the search button below to display the search results, and jump to the search results interface to display the search expression that just appeared in the search box. This is the searched file.