1. Topic retrieval: Topic retrieval refers to the retrieval in the topic field indexed by China HowNet, which contains all the topic features of an art
1. Topic retrieval: Topic retrieval refers to the retrieval in the topic field indexed by China HowNet, which contains all the topic features of an article. At the same time, tools such as professional dictionary, thesaurus, Chinese-English bilingual dictionary and stop thesaurus are embedded in the retrieval process, and low-relevance or micro-relevance documents are truncated by keyword truncation algorithm.
2. Article retrieval: Article retrieval refers to the retrieval within the scope of article title, keywords and abstract. See article title retrieval, keyword retrieval and abstract retrieval for details.
3. Keyword retrieval: The scope of keyword retrieval includes Chinese and English keywords given in the original document and keywords derived from machine marks after analyzing and calculating the document. The keywords of machine indexing are based on the analysis of the full text and combined with professional dictionaries, which solves the problem of incomplete and inaccurate keywords given by literature authors.
4. Title search: titles of periodicals, conferences, dissertations and periodicals are all in Chinese and English. The titles of newspaper documents include quotations, main titles and sub-titles. The title of the yearbook is the title of the item. The name of the patent is the name of the patent. The title of the standard is Chinese and English standard names. The title of the result is the name of the result. The title of an ancient book is the title of a book.
5. Full-text retrieval: Full-text retrieval refers to searching in the whole text range of a document, including document title, keywords, abstract, text, references, etc.