On the page of professional retrieval methods of China HowNet, the writing method of professional retrieval is given, and the specific retrieval steps are as follows:
1, open China HowNet.
2. Click "Advanced Search" on the right.
3. Enter the advanced retrieval interface.
4. Click "Professional Search" at the top.
5. Visible "searchable fields" (field codes) and "examples"
In addition, codes such as Boolean logic operators and conditional restrictions (such as AND, or, not, etc. ) will be used to write professional search formulas.
Extended data:
Introduction to retrieval:
1 quick retrieval:
A search method similar to a search engine is provided. Users only need to enter the keywords they are looking for and click "Quick Search" to find relevant documents.
2 standard search:
In standard retrieval, the retrieval process is standardized into three steps: first, input retrieval control conditions such as time, supporting fund, literature source and author; 2. Enter the full text, title, subject, keywords and other search conditions of the literature; Thirdly, the search results are grouped and sorted, and the final result is obtained by repeatedly screening and modifying the search formula.
3 professional search:
Using logical operators and keywords to construct retrieval formulas for novelty retrieval and information analysis of library and information professionals.
4 citation retrieval:
On the basis of searching references, according to the citation relationship of documents, the cited documents are found. All the documents in the citation database have citation or cited relationships with other documents, and citation retrieval is to retrieve documents through these relationships.
5 "HowNet Festival" search:
It is based on the author, title, keywords, abstract and other characteristic information of literature knowledge network section to find important literature knowledge network section, and finally find a group of documents related to these knowledge network sections.
6 The author sends out the retrieval file:
Through the author's name, unit and other information, find out all the documents published by the author and the cited downloads. Through the author's post search, we can not only find the literature published by an author, but also get an all-round understanding of the author's main research fields and achievements by grouping and screening the results.
7. Research Fund Search:
The retrieval of scientific research funds is to find these documents by their names. By grouping and screening the retrieval results, we can also fully understand the information such as the scope of disciplines funded by scientific research funds and the fields of scientific research disciplines.
8 sentence retrieval:
Sentence retrieval is to find a sentence containing two keywords through two keywords input by users. Because sentences contain a lot of factual information, searching sentences can provide users with answers to questions about facts.
9 knowledge meta-retrieval:
Knowledge element retrieval is to extract knowledge element information such as academic terms, concepts, numbers, graphs and tables from the literature database, and provide users with factual retrieval about knowledge elements.