Abstract is the epitome of the paper, which directly states the content of the paper in short and easy-to-understand words without comments and annotations, and clearly and completely shows the general situation of the paper, appearing after the title and author and before the keywords.

Second, the definition of keywords

Keywords are standardized words or terms that play a key role from the title and text of the paper. Labeling after the abstract and before the text, respectively, is used to express a certain amount of information, which is convenient for the document information retrieval system to store in memory for retrieval.

Extended data

First, the basic form of abstract writing

1, indicative summary

The writing of this paper mainly introduces the object, purpose, methods and main conclusions of the research and investigation, but does not give specific results. Indicative abstracts are suitable for documents with many topics and complicated contents.

2. Guidance summary

Explain and summarize the contents of the paper and improve the condensed essay. Guiding abstracts are suitable for academic papers with unified themes, and are generally used for papers published in academic journals.

3. Report-indicative summary

The combination of reportable summary and indicative summary not only reports the most valuable information in the paper, but also summarizes the research results of the paper, which is concise and to the point and dominates the whole article. Most papers published in academic journals adopt this abstract form.

Second, the basic principles of keyword indexing

1, the principle of objectivity

Keyword indexing should objectively reflect the central content of the document according to its true colors, and should not be mixed with personal subjective opinions, subjective guesses and praises, so as to avoid or reduce indexing errors.

2, the principle of pertinence

The purpose of keyword indexing is to provide readers with useful information or clues that meet the requirements of retrieval tools or retrieval systems in a condensed form, thus greatly shortening the time for readers to retrieve the required papers and improving the timeliness and utilization rate of paper information reports.

3. The principle of specificity

Keyword indexing should give priority to the topic words that best conform to the theme concept in the thesaurus to express the theme of the paper.

4. Trap principle

Trapping refers to the comprehensive degree of refining the concepts of various topics discussed in a paper. The level of trap is directly related to the indexing depth, which affects the recall rate. But the higher the net, the better, but just right.

Baidu Encyclopedia-Abstract

Baidu Encyclopedia-Keywords