Simple comparison:

1. From the collection situation, VIP has the longest collection time and Wanfang has the shortest collection time, but Wanfang is the best in this issue. Many VIP journals have disappeared in the last two years, especially medical journals.

2. Document clarity: 10,000 square meters is the highest, and VIP is the worst.

3, ease of use: HowNet is similar to Wanfang, and VIP is the worst.

4. Others: Wanfang's periodical browsing function is very good.

A deeper comparison:

China Knowledge Repository (CNKI) China Knowledge Repository is a large-scale knowledge service platform and digital learning system sponsored by Tsinghua University, published by China academic journal (CD-ROM version) and Tsinghua Tongfangzhiwang (Beijing) Technology Co., Ltd., and built by hundreds of scientists, academicians and scholars. At present, the general database contains the knowledge of natural science, humanities and social sciences and engineering technology, and has journals, newspapers, doctoral and excellent master's degree theses from doctoral and master's training institutions, papers from important national conferences, multimedia teaching AIDS for primary and secondary schools and more than 1000 joining databases. The full text is in CAJ and PDF format and can only be read by downloading special CAJ and PDF browsers.

The core databases of China Knowledge Resource Database are:

As of March 2007, China Journal Full-text Database (CJFD) has included 865,438+027 domestic journals, with a total of more than 22.72 million full-text documents. Generally, the collection time is 1994, which can be traced back to 1979 or the founding year, and it is divided into 126 topics according to disciplines. The products are online version, CD-ROM version and CD-ROM version of China periodical full-text database.

The full-text database of excellent doctoral and master's dissertations in China (CDMD) contains dissertations from more than 300 doctoral and master's training institutions since 2000, and the content is increasing day by day.

The full-text database of important newspapers in China (CCND) contains more than 1000 kinds of important newspapers since 2000, and the content is increasing every day.

The full-text database of Proceedings of Important Conferences of China (CPCD) contains the conference papers of 400 academic groups since 2000, and the content is increasing day by day.

China Enterprise Knowledge Base (CEKD) contains more than 5,400 kinds of domestic core and professional journals, doctoral dissertations, newspapers and periodicals, industry standards, laws and regulations, industry economic data statistics, in-depth research reports, technology development trends, foreign economic development trends and other information, covering enterprise technical innovation, business decision-making, enterprise management, WTO, industry trends and other professional information.

China full-text database of books, China Yearbook database, encyclopedia database of various industries, audio-visual database, special database of maintaining advanced education in party member, etc.

Taking China periodical full-text database as an example, this paper illustrates the retrieval mode of China HowNet. China periodical full-text database has four ways: classified retrieval, primary retrieval, advanced retrieval and professional retrieval. In each retrieval result (including the retrieval result of secondary retrieval), countless secondary retrieval can be carried out, and the retrieval range can be gradually narrowed until the retrieval result is zero.

Chongqing Weipu Information Co., Ltd. is a large-scale specialized data company under the Southwest Information Center of the Ministry of Science and Technology, and the founder of China periodical database construction. Since 1989, it has devoted itself to the in-depth development and promotion of periodicals and other information resources, integrating data collection, data processing, CD production and distribution, and online information service; There are 8000 Chinese periodicals, 1000 Chinese newspapers and 4000 foreign periodicals, with more than 2000 regular customers. At present, it has become one of the powerful pillars to promote the construction of digital libraries in China.

Among the above databases, the database of Chinese sci-tech periodicals is the most commonly used and popular database. Originated from the title database of China sci-tech periodicals founded by 1989 Chongqing Weipu Information Co., Ltd., the full text corresponds to the abstract version of the title. After the popularization and improvement of 16, the problem that the abstract version contains a large number of articles but it is cumbersome to obtain the original text is completely solved. The introduction of the full-text version has been widely praised in China and has become an important part of the literature guarantee system of colleges and universities in various provinces and cities across the country. China Sci-tech Periodical Database is also the world's largest full-text database of Chinese periodicals, with more than 7.28 million full-text documents, which are divided into seven collections: natural science collection, agricultural science collection, medical and health collection, educational science collection, economic management collection, library and information collection and engineering technology collection.

Brief introduction of Wanfang database

Source of knowledge: Wan Fang Data Co., Ltd. is the first joint-stock high-tech enterprise with information service as its core in China. As one of the earliest enterprises providing Internet services in China, Wan Fang Data adheres to the construction of information resources as the core, strives to develop into the first information service provider in China, develops unique information processing schemes and information value-added products, provides users with comprehensive solutions from data, information to knowledge, serves the informatization construction of national economy, and promotes the growth of information quality of Chinese people.

Coverage: natural science, mathematical physics, astronomy, earth, biology, medicine, health, industrial technology, aviation, environment, social science, human geography and other disciplines.

Collection years: The full-text database of conference papers in China mainly collects national academic conference papers organized by national societies, associations and research institutes since 1998.