1. Continuity: Journals usually have serial numbers, and each issue has a unique identifier, such as ISSN or CN.
2. Timeliness: Journals usually pay attention to the latest research results, academic trends or social events, so they have strong timeliness.
3. Discipline: Journals are classified according to different disciplines or fields, including natural science, social science and humanities. Each journal usually covers articles in multiple disciplines or fields.
4. Academic: Journals usually publish some articles with academic value, which are usually subject to strict peer review and editing to ensure their quality and reliability.
According to the characteristics of periodicals, there are many retrieval tools that can help readers find the periodicals and articles they need quickly and accurately. The following are some commonly used periodical retrieval tools:
1. Academic search engines: such as Google Academic and Bing Scholar. These search engines can search academic journals, conference papers, degree papers and so on. , and usually provide comprehensive academic resources.
2. Periodical databases: such as China Knowledge Network and Wan Fang Data. These databases contain a large number of academic journals, covering many disciplines and fields. Users can search by keywords, subject, author and other conditions, and can view the full text of the article and references and other information.
3. Library resource retrieval tools: such as superstar digital library, reading show, etc. These tools can help readers retrieve the periodicals and articles collected in the library, and users can access and download them through the account and password of the library.
4. Specialized databases: such as Science Network and Scopus. These databases mainly contain some high-quality academic journals and conference papers, and users can search by subject fields or topics.
In a word, periodicals are an important academic resource. By using appropriate retrieval tools, readers can quickly and accurately find the journals and articles they need, so as to better understand academic trends and research results.