1, different database contents:
Since 1994, HowNet has collected more than 6,000 periodicals, including more than 5,400 full-text periodicals with about 6.64 million full-text articles. It mainly includes core journals and professional journals, 9 series 126 topics.
From 1989 to 1999, VIP has more than 7,000 periodicals, reaching more than 12000 since 2000, covering almost all Chinese publications in China. The content is mainly natural science and engineering technology.
Since Wanfang 1998, * * has collected more than 2,700 kinds of periodicals with about 300,000 articles. Subjects are divided into basic science, humanities, medicine and health, and industrial technology. Core journals account for a high proportion. The content is mainly scientific and technological information, giving consideration to humanities, and suitable for engineering or science and engineering colleges.
2. Different inclusive years:
HowNet: Mainly from 1994 to the present, but there are more than 3,500 periodicals dating back to the founding year.
VIP: the number of years 1989 has been included.
Wanfang: The number of years of journals included is 1998.
3, the data processing efficiency is different:
HowNet: Papers are updated daily, and most other materials are updated monthly, aiming at the whole database.
Wanfang: It is updated irregularly, and the update amount is uncertain.
VIP: semi-monthly update.